/* =========================================================
   MacroMind｜高校宏观经济学智能导师
   样式体系
   ========================================================= */

/* ---------- 1. 基础与设计变量 ---------- */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --green: #1f4e79;
    --green-hover: #25684A;
    --green-dark: #16293d;
    --green-deep: #0B241B;
    --green-light: #E7F2EC;
    --green-mist: #F2F8F4;

    --teal: #2E6E8E;
    --teal-light: #E8F1F5;

    --amber: #C98A2D;
    --amber-light: #F8EFE0;

    --red: #C4523E;
    --red-light: #F9EAE7;

    --text: #16211B;
    --text-2: #3E4C44;
    --text-light: #5a6b7c;

    --bg: #F5F8F6;
    --white: #FFFFFF;

    --border: #dde5ee;
    --border-strong: #CBD8D0;

    --radius: 14px;
    --radius-sm: 9px;

    --shadow-sm: 0 2px 10px rgba(23, 48, 38, 0.06);
    --shadow: 0 15px 45px rgba(23, 48, 38, 0.10);
    --shadow-lg: 0 24px 60px rgba(23, 48, 38, 0.14);

    --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--green);
    color: #fff;
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #C6D4CC;
    border-radius: 10px;
    border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--green);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    font-size: inherit;
    color: inherit;
}

input,
select,
textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

.hidden {
    display: none !important;
}

/* ---------- 2. 导航栏 ---------- */

.header {
    height: 72px;
    padding: 0 4%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.brand {
    display: flex;
    align-items: center;
    gap: 11px;
    cursor: pointer;
    flex-shrink: 0;
    user-select: none;
}

.brand-icon {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--green), var(--green-dark));
    color: #fff;
    font-weight: 800;
    font-size: 21px;
    box-shadow: 0 6px 16px rgba(47, 125, 91, 0.28);
}

.brand-name {
    font-size: 19px;
    font-weight: 800;
    letter-spacing: -0.3px;
    line-height: 1.2;
}

.brand-subtitle {
    color: var(--text-light);
    font-size: 10px;
    letter-spacing: 0.4px;
    margin-top: 1px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-item {
    color: var(--text-2);
    font-size: 13.5px;
    cursor: pointer;
    position: relative;
    padding: 10px 13px;
    border-radius: 8px;
    transition: color 0.2s, background 0.2s;
    white-space: nowrap;
}

.nav-item:hover {
    color: var(--green);
    background: var(--green-mist);
    box-shadow: 0 2px 8px rgba(31, 79, 121, 0.10);
}

.nav-item.active {
    color: var(--green);
    font-weight: 700;
    background: var(--green-light);
    box-shadow: inset 0 -2px 0 var(--green);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.icon-button {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    color: var(--text-2);
    background: var(--green-mist);
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.icon-button:hover {
    color: var(--green);
    border-color: var(--green);
    transform: translateY(-1px);
}

.header-button {
    background: var(--green-dark);
    color: #fff;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(18, 56, 42, 0.25);
}

.header-button:hover {
    background: var(--green);
    transform: translateY(-1px);
}

.menu-toggle {
    display: none;
    width: 38px;
    height: 38px;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    color: var(--text-2);
    background: var(--green-mist);
    border: 1px solid var(--border);
}

/* ---------- 3. 通用组件 ---------- */

.page {
    display: none;
    min-height: calc(100vh - 72px);
    animation: fadeIn 0.35s ease;
}

.active-page {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.section {
    padding: 72px 6%;
    max-width: 1280px;
    margin: 0 auto;
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 30px;
    margin-bottom: 42px;
}

.section-heading h2 {
    font-size: 30px;
    letter-spacing: -0.8px;
    line-height: 1.25;
    margin-top: 8px;
}

.section-heading p {
    color: var(--text-light);
    font-size: 14px;
    max-width: 320px;
    text-align: right;
}

.section-label {
    color: var(--green);
    font-size: 10.5px;
    font-weight: 800;
    letter-spacing: 2.5px;
    text-transform: uppercase;
}

.page-header {
    margin-bottom: 44px;
}

.page-header h1 {
    font-size: 38px;
    letter-spacing: -1px;
    margin: 10px 0 8px;
    line-height: 1.2;
}

.page-header p {
    color: var(--text-light);
    font-size: 15px;
    max-width: 560px;
}

.primary-button {
    background: var(--green);
    color: #fff;
    padding: 12px 24px;
    border-radius: 10px;
    font-size: 13.5px;
    font-weight: 600;
    transition: all 0.22s;
    box-shadow: 0 6px 18px rgba(47, 125, 91, 0.22);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.primary-button:hover {
    background: var(--green-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(47, 125, 91, 0.30);
}

.primary-button:active {
    transform: translateY(0);
}

.secondary-button {
    border: 1px solid var(--border-strong);
    background: var(--white);
    color: var(--text-2);
    padding: 12px 22px;
    border-radius: 10px;
    font-size: 13.5px;
    font-weight: 500;
    transition: all 0.22s;
}

.secondary-button:hover {
    border-color: var(--green);
    color: var(--green);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.outline-button {
    border: 1px solid var(--border-strong);
    background: var(--white);
    color: var(--text-2);
    padding: 11px 20px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s;
}

.outline-button:hover {
    border-color: var(--green);
    color: var(--green);
    background: var(--green-mist);
}

.outline-button.full {
    width: 100%;
}

.mini-button {
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text-light);
    padding: 5px 12px;
    border-radius: 7px;
    font-size: 12px;
    transition: all 0.2s;
}

.mini-button:hover {
    color: var(--green);
    border-color: var(--green);
}

.score-bar {
    height: 7px;
    background: #E8EDEA;
    border-radius: 20px;
    overflow: hidden;
}

.score-bar div {
    height: 100%;
    background: linear-gradient(90deg, var(--green), #5AA883);
    border-radius: inherit;
    transition: width 0.6s ease;
}

.formula {
    display: inline-block;
    background: var(--green-light);
    border: 1px solid #c9d8ea;
    color: var(--green-dark);
    font-family: "Cambria Math", "Times New Roman", serif;
    font-size: 15px;
    padding: 7px 16px;
    border-radius: 8px;
    margin: 6px 0;
    letter-spacing: 0.3px;
}

/* ---------- 4. 首页 Hero ---------- */

.hero {
    padding: 84px 6%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    max-width: none;
    background:
        radial-gradient(circle at 85% 15%, rgba(92, 168, 131, 0.18) 0%, transparent 40%),
        radial-gradient(circle at 10% 90%, rgba(46, 110, 142, 0.10) 0%, transparent 45%),
        linear-gradient(135deg, #F8FBF9, #EDF4F0);
    border-bottom: 1px solid var(--border);
}

.hero-left {
    max-width: 620px;
}

.eyebrow {
    display: inline-block;
    padding: 7px 14px;
    background: var(--green-light);
    color: var(--green);
    border-radius: 20px;
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 1.8px;
    margin-bottom: 26px;
    border: 1px solid #D3E6DB;
}

.hero h1 {
    font-size: 56px;
    line-height: 1.1;
    letter-spacing: -2.5px;
    margin-bottom: 26px;
    font-weight: 800;
}

.hero h1 span {
    color: var(--green);
    position: relative;
    background: linear-gradient(120deg, var(--green), #2E8FC9);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero h1 span::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 4px;
    height: 10px;
    background: rgba(47, 125, 91, 0.15);
    border-radius: 4px;
    z-index: -1;
}

.hero-description {
    color: var(--text-light);
    max-width: 560px;
    font-size: 15.5px;
    line-height: 1.9;
    margin-bottom: 34px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 46px;
}

.hero-stats {
    display: flex;
    gap: 42px;
}

.hero-stats div {
    display: flex;
    flex-direction: column;
}

.hero-stats strong {
    font-size: 24px;
    color: var(--green-dark);
    letter-spacing: -0.5px;
}

.hero-stats span {
    color: var(--text-light);
    font-size: 11.5px;
    margin-top: 2px;
}

/* 首页右侧驾驶舱 */

.hero-dashboard {
    width: 380px;
    padding: 30px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    flex-shrink: 0;
    transform: rotate(0.5deg);
    transition: transform 0.3s;
}

.hero-dashboard:hover {
    transform: rotate(0deg) translateY(-4px);
}

.dashboard-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 26px;
}

.small-label {
    font-size: 9.5px;
    color: var(--text-light);
    letter-spacing: 1.8px;
    text-transform: uppercase;
}

.dashboard-top h3 {
    margin-top: 4px;
    font-size: 17px;
    letter-spacing: -0.3px;
}

.dashboard-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--green-light);
    color: var(--green);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 16px;
}

.learning-score {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 10px;
}

.score-number {
    font-size: 42px;
    font-weight: 800;
    color: var(--green);
    letter-spacing: -2px;
    line-height: 1;
}

.learning-score span {
    font-size: 12px;
    color: var(--text-light);
    display: block;
}

.learning-score strong {
    font-size: 18px;
    color: var(--green-dark);
}

.dashboard-list {
    margin-top: 26px;
}

.dashboard-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid #EEF2EF;
}

.dashboard-item:last-child {
    border-bottom: none;
}

.item-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}

.item-icon.green { background: var(--green-light); color: var(--green); }
.item-icon.blue { background: var(--teal-light); color: var(--teal); }
.item-icon.orange { background: var(--amber-light); color: var(--amber); }

.item-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.item-info strong { font-size: 13px; }
.item-info span { font-size: 11px; color: var(--text-light); }

.dashboard-button {
    width: 100%;
    margin-top: 20px;
    border: none;
    background: var(--green-mist);
    color: var(--green-dark);
    padding: 12px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 600;
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.dashboard-button:hover {
    background: var(--green-light);
    color: var(--green);
}

/* ---------- 5. 功能卡片 ---------- */

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.feature-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px 26px;
    position: relative;
    cursor: pointer;
    transition: all 0.25s;
    overflow: hidden;
}

.feature-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    background: linear-gradient(90deg, var(--green), var(--teal));
    opacity: 0;
    transition: opacity 0.25s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--border-strong);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-number {
    position: absolute;
    top: 18px;
    right: 22px;
    font-size: 40px;
    font-weight: 800;
    color: rgba(23, 48, 38, 0.06);
    letter-spacing: -2px;
    line-height: 1;
}

.feature-icon {
    width: 54px;
    height: 54px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    background: var(--green-light);
    color: var(--green);
}

.feature-card:nth-child(2) .feature-icon { background: var(--teal-light); color: var(--teal); }
.feature-card:nth-child(3) .feature-icon { background: var(--amber-light); color: var(--amber); }
.feature-card:nth-child(5) .feature-icon { background: var(--teal-light); color: var(--teal); }
.feature-card:nth-child(6) .feature-icon { background: var(--amber-light); color: var(--amber); }

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

.feature-card p {
    color: var(--text-light);
    font-size: 13.5px;
    line-height: 1.7;
    margin-bottom: 16px;
}

.feature-card span {
    color: var(--green);
    font-size: 13px;
    font-weight: 600;
    transition: gap 0.2s;
    display: inline-flex;
    gap: 4px;
}

.feature-card:hover span {
    gap: 8px;
}

/* ---------- 6. AI Banner ---------- */

.ai-banner {
    background: linear-gradient(120deg, var(--green-dark) 0%, #1D5A42 60%, var(--green) 100%);
    border-radius: 20px;
    padding: 48px 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    color: #fff;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.ai-banner::after {
    content: "∑";
    position: absolute;
    right: -20px;
    bottom: -60px;
    font-size: 220px;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.06);
    font-family: "Cambria Math", serif;
}

.ai-banner .section-label {
    color: #9FD8BC;
}

.ai-banner h2 {
    font-size: 30px;
    letter-spacing: -0.8px;
    margin: 10px 0 10px;
    line-height: 1.3;
}

.ai-banner p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    max-width: 460px;
}

.ai-banner .primary-button {
    background: #fff;
    color: var(--green-dark);
    box-shadow: none;
    flex-shrink: 0;
}

.ai-banner .primary-button:hover {
    background: var(--green-light);
}

/* ---------- 7. 课程学习 ---------- */

.course-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 28px;
    align-items: start;
}

.course-sidebar {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    position: sticky;
    top: 96px;
}

.course-sidebar h3 {
    font-size: 15px;
    margin-bottom: 14px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.chapter-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 540px;
    overflow-y: auto;
}

.chapter {
    padding: 10px 13px;
    border-radius: 9px;
    font-size: 13.5px;
    color: var(--text-2);
    cursor: pointer;
    transition: all 0.18s;
    border: 1px solid transparent;
}

.chapter:hover {
    background: var(--green-mist);
    color: var(--green);
}

.chapter.active {
    background: var(--green-light);
    color: var(--green-dark);
    font-weight: 700;
    border-color: #c9d8ea;
}

.course-content {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 34px;
    min-height: 480px;
}

.chapter-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 10px;
}

.chapter-head .chapter-no {
    color: var(--green);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 1.5px;
}

.course-content h2 {
    font-size: 26px;
    letter-spacing: -0.6px;
    margin-bottom: 10px;
}

.course-content .chapter-summary {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 26px;
}

.lesson-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px 20px;
    margin-bottom: 12px;
    transition: all 0.2s;
    cursor: pointer;
    background: var(--white);
}

.lesson-card:hover {
    border-color: var(--green);
    box-shadow: var(--shadow-sm);
    transform: translateX(3px);
}

.lesson-card .lesson-tag {
    color: var(--teal);
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 1.5px;
}

.lesson-card h4 {
    font-size: 15.5px;
    margin: 5px 0 6px;
}

.lesson-card p {
    color: var(--text-light);
    font-size: 13px;
    line-height: 1.65;
}

.concept-block {
    margin-top: 26px;
}

.concept-block h4 {
    font-size: 14px;
    margin-bottom: 12px;
    color: var(--text-2);
}

.concept-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.chip {
    background: var(--green-mist);
    border: 1px solid var(--border);
    color: var(--green-dark);
    font-size: 12.5px;
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 500;
}

.formula-block {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
}

/* 课时详情 */

.lesson-detail {
    padding: 6px 0;
}

.lesson-detail .back-link {
    color: var(--green);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-bottom: 18px;
}

.lesson-detail .back-link:hover {
    text-decoration: underline;
}

.lesson-detail h2 {
    font-size: 23px;
    margin-bottom: 14px;
}

.lesson-detail .lesson-body {
    color: var(--text-2);
    font-size: 14.5px;
    line-height: 1.9;
    margin-bottom: 20px;
}

.point-list {
    list-style: none;
    margin-bottom: 24px;
}

.point-list li {
    padding: 9px 14px;
    background: var(--green-mist);
    border-radius: 9px;
    margin-bottom: 8px;
    font-size: 13.5px;
    color: var(--text-2);
    border-left: 3px solid var(--green);
}

.lesson-actions {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

/* ---------- 8. AI 导师 / 聊天 ---------- */

.tutor-page {
    max-width: 980px;
}

.chat-window {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    height: 620px;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 22px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(90deg, var(--green-mist), var(--white));
}

.chat-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--green), var(--green-dark));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 17px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(47, 125, 91, 0.3);
}

.chat-header-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-header-info strong {
    font-size: 15px;
}

.chat-header-info span {
    font-size: 11.5px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 6px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
    display: inline-block;
    animation: pulse 2s infinite;
}

.status-dot.offline {
    background: var(--text-light);
    animation: none;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(47, 125, 91, 0.35); }
    50% { box-shadow: 0 0 0 5px rgba(47, 125, 91, 0); }
}

.chat-body {
    flex: 1;
    overflow-y: auto;
    padding: 26px 22px;
    background:
        radial-gradient(circle at 90% 10%, rgba(92, 168, 131, 0.05), transparent 40%),
        var(--white);
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.message {
    display: flex;
    gap: 11px;
    max-width: 86%;
    animation: msgIn 0.3s ease;
}

@keyframes msgIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--green-light);
    color: var(--green);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 14px;
    flex-shrink: 0;
    margin-top: 2px;
}

.message.user-message .message-avatar {
    background: var(--green-dark);
    color: #fff;
}

.message-content {
    padding: 13px 17px;
    border-radius: 14px;
    font-size: 14px;
    line-height: 1.8;
    overflow-wrap: break-word;
    word-break: break-word;
}

.ai-message .message-content {
    background: var(--green-mist);
    border: 1px solid var(--border);
    border-top-left-radius: 4px;
}

.user-message .message-content {
    background: var(--green);
    color: #fff;
    border-top-right-radius: 4px;
}

.message-content strong {
    font-weight: 700;
}

.user-message .message-content strong {
    color: #fff;
}

.message-content .formula {
    background: var(--white);
    border-color: var(--border-strong);
}

/* Markdown 渲染 */

.message-content ul,
.message-content ol {
    padding-left: 20px;
    margin: 6px 0;
}

.message-content li {
    margin: 3px 0;
}

.message-content code {
    background: rgba(47, 125, 91, 0.10);
    color: var(--green-dark);
    padding: 1px 6px;
    border-radius: 5px;
    font-size: 12.5px;
    font-family: Consolas, Monaco, monospace;
}

.message-content pre {
    background: var(--green-deep);
    color: #D9F2E5;
    padding: 14px 16px;
    border-radius: 10px;
    overflow-x: auto;
    margin: 8px 0;
    font-size: 12.5px;
    font-family: Consolas, Monaco, monospace;
    line-height: 1.6;
}

.message-content pre code {
    background: none;
    color: inherit;
    padding: 0;
}

.message-content blockquote {
    border-left: 3px solid var(--green);
    padding: 6px 14px;
    margin: 8px 0;
    color: var(--text-2);
    background: var(--green-mist);
    border-radius: 0 8px 8px 0;
    font-size: 13.5px;
}

.math {
    font-family: "Cambria Math", "Times New Roman", serif;
    color: var(--green-dark);
    background: rgba(47, 125, 91, 0.06);
    padding: 1px 5px;
    border-radius: 4px;
    white-space: nowrap;
}

.frac {
    display: inline-flex;
    flex-direction: column;
    vertical-align: middle;
    text-align: center;
    margin: 0 2px;
    line-height: 1.15;
    font-size: 0.9em;
}

.frac .num {
    border-bottom: 1px solid currentColor;
    padding: 0 4px;
}

.frac .den {
    padding: 0 4px;
}

sup, sub {
    line-height: 0;
}

/* 消息操作栏 */

.message-actions {
    display: flex;
    gap: 8px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity 0.2s;
}

.message:hover .message-actions {
    opacity: 1;
}

.message-actions button {
    font-size: 11.5px;
    color: var(--text-light);
    border: 1px solid var(--border);
    background: var(--white);
    padding: 4px 10px;
    border-radius: 6px;
    transition: all 0.15s;
}

.message-actions button:hover {
    color: var(--green);
    border-color: var(--green);
}

/* 建议追问 */

.followup-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.followup-chip {
    background: var(--white);
    border: 1px dashed var(--border-strong);
    color: var(--green);
    font-size: 12px;
    padding: 5px 12px;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.18s;
}

.followup-chip:hover {
    border-style: solid;
    border-color: var(--green);
    background: var(--green-light);
}

/* 打字指示 */

.typing-indicator {
    display: inline-flex;
    gap: 5px;
    padding: 6px 4px;
}

.typing-indicator span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--green);
    animation: typing 1.2s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.15s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.3s; }

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-5px); opacity: 1; }
}

/* 快捷提问 */

.quick-questions {
    display: flex;
    gap: 9px;
    padding: 12px 22px;
    border-top: 1px solid var(--border);
    background: var(--white);
    flex-wrap: wrap;
}

.quick-question {
    background: var(--green-mist);
    border: 1px solid var(--border);
    color: var(--green-dark);
    font-size: 12.5px;
    padding: 7px 14px;
    border-radius: 18px;
    transition: all 0.18s;
    white-space: nowrap;
}

.quick-question:hover {
    background: var(--green-light);
    border-color: var(--green);
    transform: translateY(-1px);
}

/* 输入区 */

.chat-input-area {
    display: flex;
    gap: 10px;
    padding: 14px 22px 16px;
    border-top: 1px solid var(--border);
    background: var(--white);
}

.chat-input {
    flex: 1;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: var(--green-mist);
}

.chat-input:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(47, 125, 91, 0.12);
    background: var(--white);
}

.send-button {
    background: var(--green);
    color: #fff;
    padding: 0 26px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s;
    box-shadow: 0 4px 14px rgba(47, 125, 91, 0.25);
}

.send-button:hover {
    background: var(--green-hover);
    transform: translateY(-1px);
}

.send-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.chat-footnote {
    padding: 8px 22px 12px;
    font-size: 11.5px;
    color: var(--text-light);
    background: var(--white);
    text-align: center;
    border-top: 1px dashed var(--border);
}

/* ---------- 9. 在线题库 ---------- */

.question-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 28px;
    align-items: start;
}

.question-main {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
    box-shadow: var(--shadow-sm);
}

.question-meta {
    display: flex;
    gap: 10px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}

.question-meta span {
    background: var(--green-light);
    color: var(--green-dark);
    font-size: 11.5px;
    font-weight: 700;
    padding: 5px 12px;
    border-radius: 16px;
}

.question-meta .q-index {
    background: var(--teal-light);
    color: var(--teal);
    margin-left: auto;
}

.question-main h2 {
    font-size: 22px;
    line-height: 1.55;
    letter-spacing: -0.3px;
    margin-bottom: 26px;
    font-weight: 650;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 11px;
    margin-bottom: 22px;
}

.option {
    text-align: left;
    border: 1.5px solid var(--border);
    background: var(--white);
    border-radius: 11px;
    padding: 14px 18px;
    font-size: 14.5px;
    color: var(--text-2);
    transition: all 0.18s;
    position: relative;
}

.option:hover {
    border-color: var(--green);
    background: var(--green-mist);
    transform: translateX(3px);
}

.option.selected {
    border-color: var(--teal);
    background: var(--teal-light);
    color: var(--teal);
    font-weight: 600;
}

.option.correct {
    border-color: var(--green);
    background: var(--green-light);
    color: var(--green-dark);
    font-weight: 600;
}

.option.wrong {
    border-color: var(--red);
    background: var(--red-light);
    color: var(--red);
}

.option:disabled {
    cursor: default;
    transform: none;
}

.answer-box {
    background: var(--green-mist);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px 22px;
    margin-bottom: 22px;
    animation: msgIn 0.3s ease;
}

.answer-box.wrong-box {
    background: var(--red-light);
    border-color: #F0CCC4;
}

.answer-box strong {
    font-size: 14px;
    color: var(--green-dark);
}

.answer-box.wrong-box strong {
    color: var(--red);
}

.answer-box p {
    margin: 8px 0;
    font-size: 13.5px;
    color: var(--text-2);
    line-height: 1.8;
}

.answer-verdict {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 6px;
}

.answer-verdict.good { color: var(--green); }
.answer-verdict.bad { color: var(--red); }

.practice-nav {
    display: flex;
    gap: 12px;
    justify-content: space-between;
    align-items: center;
}

.practice-nav .primary-button,
.practice-nav .outline-button {
    padding: 11px 20px;
}

.question-sidebar {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    position: sticky;
    top: 96px;
}

.question-sidebar h3 {
    font-size: 16px;
    margin-bottom: 16px;
}

.practice-stats {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
    margin-bottom: 20px;
}

.practice-stats div {
    background: var(--green-mist);
    border-radius: 10px;
    padding: 12px 6px;
    text-align: center;
}

.practice-stats span {
    display: block;
    font-size: 10.5px;
    color: var(--text-light);
    margin-bottom: 3px;
}

.practice-stats strong {
    font-size: 18px;
    color: var(--green-dark);
}

.practice-filter {
    margin-bottom: 18px;
}

.practice-filter h4 {
    font-size: 12.5px;
    color: var(--text-2);
    margin-bottom: 8px;
}

.practice-filter select {
    width: 100%;
    border: 1px solid var(--border-strong);
    border-radius: 9px;
    padding: 9px 12px;
    background: var(--white);
    outline: none;
    font-size: 13px;
}

.practice-filter select:focus {
    border-color: var(--green);
}

.question-progress {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 20px;
}

.qp-dot {
    width: 26px;
    height: 26px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    background: var(--green-mist);
    border: 1px solid var(--border);
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.15s;
}

.qp-dot:hover {
    border-color: var(--green);
    color: var(--green);
}

.qp-dot.current {
    border-color: var(--green);
    color: var(--green);
    background: var(--green-light);
}

.qp-dot.done {
    background: var(--green-light);
    color: var(--green);
}

.qp-dot.correct {
    background: var(--green);
    color: #fff;
    border-color: var(--green);
}

.qp-dot.wrong {
    background: var(--red);
    color: #fff;
    border-color: var(--red);
}

/* ---------- 10. 模型实验室 ---------- */

.model-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.model-tab {
    background: var(--white);
    border: 1px solid var(--border);
    color: var(--text-2);
    padding: 10px 22px;
    border-radius: 10px;
    font-size: 13.5px;
    font-weight: 600;
    transition: all 0.2s;
}

.model-tab:hover {
    border-color: var(--green);
    color: var(--green);
}

.model-tab.active {
    background: var(--green);
    color: #fff;
    border-color: var(--green);
    box-shadow: 0 4px 14px rgba(47, 125, 91, 0.25);
}

.model-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
    align-items: stretch;
}

.model-control {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px;
}

.model-control h3 {
    font-size: 16px;
    margin-bottom: 6px;
}

.model-control .control-sub {
    color: var(--text-light);
    font-size: 12.5px;
    margin-bottom: 20px;
}

.control-group {
    margin-bottom: 18px;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--text-2);
    margin-bottom: 8px;
    font-weight: 500;
}

.control-group label .val {
    color: var(--green);
    font-weight: 700;
    font-family: Consolas, monospace;
}

.control-group input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 10px;
    background: #e4ebf2;
    outline: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--green);
    cursor: pointer;
    border: 3px solid #fff;
    box-shadow: 0 2px 8px rgba(47, 125, 91, 0.4);
    transition: transform 0.15s;
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.model-stage {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.model-chart {
    background: var(--green-mist);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 320px;
}

.model-chart svg {
    width: 100%;
    max-width: 560px;
    height: auto;
}

.model-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 12px;
}

.model-results .result-tile {
    background: var(--green-mist);
    border: 1px solid var(--border);
    border-radius: 11px;
    padding: 14px;
    text-align: center;
}

.model-results .result-tile span {
    display: block;
    font-size: 11.5px;
    color: var(--text-light);
    margin-bottom: 5px;
}

.model-results .result-tile strong {
    font-size: 21px;
    color: var(--green-dark);
    font-family: Consolas, monospace;
}

.model-explanation {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.75;
    background: var(--green-mist);
    border-radius: 10px;
    padding: 14px 16px;
    border-left: 3px solid var(--teal);
}

/* ---------- 11. 政策模拟 ---------- */

.scenario-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.scenario-chip {
    background: var(--white);
    border: 1px solid var(--border);
    color: var(--text-2);
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 13.5px;
    font-weight: 600;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.scenario-chip .sc-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--text-light);
}

.scenario-chip:hover {
    border-color: var(--green);
    color: var(--green);
}

.scenario-chip.active {
    background: var(--green);
    border-color: var(--green);
    color: #fff;
    box-shadow: 0 4px 14px rgba(47, 125, 91, 0.25);
}

.scenario-chip.active .sc-dot {
    background: #fff;
}

.scenario-chip:nth-child(2).active { background: var(--amber); border-color: var(--amber); }
.scenario-chip:nth-child(2) .sc-dot { background: var(--amber); }
.scenario-chip:nth-child(3).active { background: var(--red); border-color: var(--red); }
.scenario-chip:nth-child(3) .sc-dot { background: var(--red); }
.scenario-chip:nth-child(4).active { background: var(--teal); border-color: var(--teal); }
.scenario-chip:nth-child(4) .sc-dot { background: var(--teal); }

.policy-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
    align-items: start;
}

.policy-options {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px;
}

.policy-options h2 {
    font-size: 17px;
    margin-bottom: 16px;
}

.policy-item {
    width: 100%;
    text-align: left;
    border: 1.5px solid var(--border);
    background: var(--white);
    border-radius: 11px;
    padding: 14px 16px;
    margin-bottom: 10px;
    transition: all 0.18s;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.policy-item strong {
    font-size: 14px;
    color: var(--text-2);
}

.policy-item span {
    font-size: 12px;
    color: var(--text-light);
}

.policy-item:hover {
    border-color: var(--green);
    transform: translateX(3px);
}

.policy-item.selected {
    border-color: var(--green);
    background: var(--green-light);
}

.policy-item.selected strong {
    color: var(--green-dark);
}

.policy-result {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px;
}

.policy-result-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.policy-result-head h2 {
    font-size: 18px;
}

.verdict-badge {
    font-size: 12.5px;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 20px;
    background: var(--green-mist);
    color: var(--text-light);
    border: 1px solid var(--border);
}

.verdict-badge.good {
    background: var(--green-light);
    color: var(--green-dark);
    border-color: #c9d8ea;
}

.verdict-badge.mid {
    background: var(--amber-light);
    color: var(--amber);
    border-color: #EDDDBF;
}

.verdict-badge.bad {
    background: var(--red-light);
    color: var(--red);
    border-color: #F0CCC4;
}

.policy-baseline {
    color: var(--text-light);
    font-size: 13px;
    margin-bottom: 18px;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.result-grid > div {
    background: var(--green-mist);
    border: 1px solid var(--border);
    border-radius: 11px;
    padding: 16px 10px;
    text-align: center;
}

.result-grid span {
    display: block;
    font-size: 11.5px;
    color: var(--text-light);
    margin-bottom: 6px;
}

.result-grid strong {
    font-size: 20px;
    color: var(--green-dark);
    font-family: Consolas, monospace;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.delta-up {
    color: var(--teal) !important;
    font-size: 12px;
}

.delta-down {
    color: var(--amber) !important;
    font-size: 12px;
}

.delta-flat {
    color: var(--text-light) !important;
    font-size: 12px;
}

.policy-narrative {
    background: var(--green-mist);
    border-left: 3px solid var(--teal);
    border-radius: 10px;
    padding: 15px 17px;
    font-size: 13.5px;
    color: var(--text-2);
    line-height: 1.85;
    margin-bottom: 18px;
    animation: msgIn 0.3s ease;
}

.policy-notes {
    margin-bottom: 20px;
}

.policy-notes h4 {
    font-size: 13px;
    color: var(--text-2);
    margin-bottom: 10px;
}

.policy-notes ul {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.policy-notes li {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 9px;
    padding: 10px 13px;
    font-size: 12.5px;
    color: var(--text-2);
}

/* ---------- 12. 学习中心 ---------- */

.profile-overview {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
    margin-bottom: 44px;
}

.profile-overview > div {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.profile-overview span {
    display: block;
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.profile-overview strong {
    font-size: 30px;
    color: var(--green-dark);
    letter-spacing: -1px;
}

.profile-overview p {
    font-size: 12px;
    color: var(--green);
    margin-top: 6px;
}

.profile-section-title {
    font-size: 20px;
    margin-bottom: 20px;
    letter-spacing: -0.3px;
}

.mastery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
    margin-bottom: 44px;
}

.mastery-grid > div {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}

.mastery-grid .m-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 10px;
}

.mastery-grid span {
    font-size: 13px;
    color: var(--text-2);
    font-weight: 600;
}

.mastery-grid strong {
    font-size: 16px;
    color: var(--green);
}

.mastery-grid .m-sub {
    font-size: 10.5px;
    color: var(--text-light);
    margin-top: 7px;
}

.profile-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 22px;
    align-items: start;
}

.wrong-book,
.recommendation {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
}

.wrong-book h2,
.recommendation h2 {
    font-size: 20px;
    margin: 6px 0 16px;
}

.wrong-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    border: 1px solid var(--border);
    border-radius: 11px;
    padding: 14px;
    margin-bottom: 10px;
    background: var(--white);
}

.wrong-item .w-badge {
    font-size: 10.5px;
    font-weight: 700;
    background: var(--red-light);
    color: var(--red);
    padding: 3px 9px;
    border-radius: 12px;
    flex-shrink: 0;
    margin-top: 2px;
}

.wrong-item .w-content {
    flex: 1;
    min-width: 0;
}

.wrong-item .w-question {
    font-size: 13px;
    color: var(--text-2);
    margin-bottom: 4px;
    line-height: 1.6;
}

.wrong-item .w-meta {
    font-size: 11px;
    color: var(--text-light);
}

.wrong-item .w-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
    flex-direction: column;
}

.wrong-item .w-actions button {
    font-size: 11px;
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-light);
    background: var(--white);
    transition: all 0.15s;
}

.wrong-item .w-actions button:hover {
    color: var(--green);
    border-color: var(--green);
}

.empty-state {
    text-align: center;
    color: var(--text-light);
    font-size: 13px;
    padding: 30px 10px;
    border: 1px dashed var(--border-strong);
    border-radius: 11px;
}

.recommendation p {
    color: var(--text-light);
    font-size: 13.5px;
    line-height: 1.85;
    margin-bottom: 20px;
}

.recommend-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* ---------- 13. 设置弹窗 ---------- */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(11, 36, 27, 0.55);
    backdrop-filter: blur(6px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.25s ease;
}

.modal {
    background: var(--white);
    border-radius: 18px;
    width: 100%;
    max-width: 520px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 30px 32px;
    box-shadow: var(--shadow-lg);
    animation: msgIn 0.3s ease;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.modal-header h2 {
    font-size: 21px;
    letter-spacing: -0.4px;
}

.modal-close {
    font-size: 26px;
    color: var(--text-light);
    line-height: 1;
    width: 34px;
    height: 34px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.modal-close:hover {
    background: var(--green-mist);
    color: var(--green);
}

.modal-hint {
    font-size: 12.5px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group > label {
    display: block;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-2);
    margin-bottom: 7px;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group select {
    width: 100%;
    border: 1px solid var(--border-strong);
    border-radius: 9px;
    padding: 10px 13px;
    font-size: 13.5px;
    outline: none;
    background: var(--white);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(47, 125, 91, 0.10);
}

.field-hint {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 5px;
}

.key-row {
    display: flex;
    gap: 8px;
}

.key-row input {
    flex: 1;
}

.cfg-value {
    color: var(--green);
    font-weight: 700;
    margin-left: 6px;
}

.form-group input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    height: 6px;
    border-radius: 10px;
    background: #e4ebf2;
    outline: none;
}

.form-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 17px;
    height: 17px;
    border-radius: 50%;
    background: var(--green);
    border: 3px solid #fff;
    box-shadow: 0 2px 8px rgba(47, 125, 91, 0.4);
    cursor: pointer;
}

.checkbox-row {
    display: flex;
    align-items: flex-start;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 13px;
    color: var(--text-2);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 17px;
    height: 17px;
    accent-color: var(--green);
    cursor: pointer;
}

.modal-actions {
    display: flex;
    gap: 10px;
    margin-top: 24px;
}

.modal-actions .primary-button {
    margin-left: auto;
}

.test-result {
    margin-top: 14px;
    padding: 12px 15px;
    border-radius: 10px;
    font-size: 12.5px;
    line-height: 1.7;
}

.test-result.ok {
    background: var(--green-light);
    color: var(--green-dark);
    border: 1px solid #c9d8ea;
}

.test-result.fail {
    background: var(--red-light);
    color: var(--red);
    border: 1px solid #F0CCC4;
}

/* ---------- 14. Toast ---------- */

.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--green-deep);
    color: #fff;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 13px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s;
    z-index: 3000;
    max-width: 90vw;
    text-align: center;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.warn {
    background: var(--amber);
}

.toast.error {
    background: var(--red);
}

/* ---------- 15. 页脚 ---------- */

.footer {
    border-top: 1px solid var(--border);
    background: var(--green-deep);
    color: rgba(255, 255, 255, 0.75);
    padding: 40px 6%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.footer-brand strong {
    color: #fff;
    font-size: 17px;
}

.footer-brand p {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.55);
    margin-top: 2px;
}

.footer-meta {
    font-size: 12px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
    color: rgba(255, 255, 255, 0.5);
}

/* ---------- 16. 响应式 ---------- */

@media (max-width: 1100px) {

    .nav-menu {
        gap: 0;
    }

    .nav-item {
        padding: 10px 9px;
        font-size: 12.5px;
    }

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .mastery-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .profile-overview {
        grid-template-columns: repeat(2, 1fr);
    }

    .policy-layout,
    .question-layout {
        grid-template-columns: 1fr;
    }

    .question-sidebar,
    .policy-options {
        position: static;
    }

}

@media (max-width: 900px) {

    .hero {
        flex-direction: column;
        padding: 60px 6%;
        gap: 48px;
    }

    .hero-dashboard {
        width: 100%;
        max-width: 460px;
    }

    .hero h1 {
        font-size: 44px;
    }

    .model-layout {
        grid-template-columns: 1fr;
    }

    .course-layout {
        grid-template-columns: 1fr;
    }

    .course-sidebar {
        position: static;
        max-height: none;
    }

    .chapter-list {
        max-height: 260px;
    }

    .profile-grid {
        grid-template-columns: 1fr;
    }

    .ai-banner {
        flex-direction: column;
        align-items: flex-start;
    }

    /* 移动端菜单 */

    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        background: var(--white);
        border-bottom: 1px solid var(--border);
        padding: 12px 4%;
        box-shadow: var(--shadow);
        display: none;
        z-index: 999;
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-item {
        padding: 12px 14px;
        font-size: 14px;
    }

    .header-button {
        display: none;
    }

}

@media (max-width: 640px) {

    .section {
        padding: 52px 5%;
    }

    .section-heading {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .section-heading p {
        text-align: left;
    }

    .section-heading h2 {
        font-size: 25px;
    }

    .page-header h1 {
        font-size: 30px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero-stats {
        gap: 22px;
        flex-wrap: wrap;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .mastery-grid {
        grid-template-columns: 1fr;
    }

    .profile-overview {
        grid-template-columns: 1fr;
    }

    .result-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .policy-notes ul {
        grid-template-columns: 1fr;
    }

    .chat-window {
        height: 72vh;
    }

    .message {
        max-width: 96%;
    }

    .question-main {
        padding: 24px 20px;
    }

    .practice-nav {
        flex-wrap: wrap;
    }

    .practice-nav .primary-button {
        order: -1;
        width: 100%;
        justify-content: center;
    }

    .modal {
        padding: 24px 20px;
    }

    .footer {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-meta {
        align-items: flex-start;
    }

    .chat-header-info span {
        font-size: 10.5px;
    }

}

/* =========================================================
   11. 登录 / 用户体系
   ========================================================= */

.login-modal { max-width: 420px; }
.login-brand { display: flex; align-items: center; gap: 12px; }
.login-brand .brand-icon { width: 42px; height: 42px; border-radius: 12px; background: linear-gradient(135deg, #1f4e79, #2f6fa8); color: #fff; font-weight: 800; font-size: 20px; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 12px rgba(47,125,91,.28); }
.login-modal h2 { margin: 18px 0 4px; font-size: 22px; color: #16293d; }
.login-modal .modal-hint { font-size: 13px; color: #5a6b7c; margin: 0 0 16px; }

.login-tabs { display: flex; background: #eef3f8; border-radius: 10px; padding: 4px; margin-bottom: 18px; }
.login-tab { flex: 1; border: none; background: transparent; padding: 9px 0; border-radius: 8px; font-size: 14px; font-weight: 600; color: #5a6b7c; cursor: pointer; transition: .2s; }
.login-tab.active { background: #fff; color: #1f4e79; box-shadow: 0 2px 6px rgba(20,60,40,.1); }

.login-error { background: #F9EAE7; color: #8F3A2A; border: 1px solid #F0CCC4; border-radius: 8px; padding: 9px 12px; font-size: 13px; margin-bottom: 14px; }
.login-tip { text-align: center; color: #7a8a9a; font-size: 12.5px; margin-top: 14px; }
.primary-button.full, .outline-button.full { width: 100%; margin-top: 8px; }

.user-chip { display: flex; align-items: center; gap: 8px; background: #eef3f8; border: 1px solid #d6e0ec; border-radius: 999px; padding: 4px 6px 4px 4px; }
.user-chip.hidden { display: none; }
.user-avatar { width: 26px; height: 26px; border-radius: 50%; background: linear-gradient(135deg, #1f4e79, #2f6fa8); color: #fff; font-size: 13px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.user-name { font-size: 13px; color: #2a4a66; max-width: 90px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-logout { border: none; background: transparent; color: #7a8a9a; font-size: 12px; cursor: pointer; padding: 4px 6px; border-radius: 6px; }
.user-logout:hover { background: #E4EDE8; color: #8F3A2A; }
#header-login-btn.hidden { display: none; }

/* =========================================================
   12. 数字人导师卡片 + AI 导师页双栏
   ========================================================= */

.tutor-layout { display: grid; grid-template-columns: 320px 1fr; gap: 20px; align-items: start; }

.digital-human-card { background: linear-gradient(180deg, #f5f8fb, #e8eef5); border: 1px solid #d6e0ec; border-radius: 18px; padding: 20px; position: sticky; top: 84px; }

.dh-stage { position: relative; aspect-ratio: 3/4; border-radius: 14px; overflow: hidden; background: linear-gradient(180deg, #ffffff 0%, #f0f5fb 100%); display: flex; align-items: flex-end; justify-content: center; }
.dh-media { width: 100%; height: 100%; display: flex; align-items: flex-end; justify-content: center; }
.dh-media img, .dh-media video { width: 100%; height: 100%; object-fit: contain; object-position: bottom; animation: dhBob 2.8s ease-in-out infinite; filter: drop-shadow(0 8px 16px rgba(31,78,121,.12)); }
.dh-placeholder { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.dh-placeholder span { width: 84px; height: 84px; border-radius: 50%; background: rgba(31,78,121,.85); color: #fff; font-size: 34px; font-weight: 800; display: flex; align-items: center; justify-content: center; }

/* 说话时嘴部辉光（Q 版脸的嘴部位置约 42%） */
.dh-mouth { position: absolute; left: 50%; top: 42%; width: 40px; height: 14px; transform: translateX(-50%); border-radius: 50%; background: radial-gradient(ellipse, rgba(255,180,180,.6) 0%, rgba(255,180,180,0) 70%); opacity: 0; pointer-events: none; transition: opacity .2s; filter: blur(3px); }
.digital-human-card.speaking .dh-mouth { opacity: 1; animation: dhMouth 0.28s ease-in-out infinite; }
@keyframes dhMouth { 0%,100% { transform: translateX(-50%) scaleY(.3); opacity: .4; } 50% { transform: translateX(-50%) scaleY(1.6); opacity: .8; } }

.dh-ring { position: absolute; inset: 10px; border-radius: 12px; border: 2px solid rgba(31,78,121,.25); pointer-events: none; transition: border-color .3s; }
.digital-human-card.speaking .dh-ring { animation: dhPulse 1.6s ease-in-out infinite; border-color: rgba(47,111,168,.8); }
.digital-human-card.thinking .dh-ring { animation: dhThink 1s ease-in-out infinite; border-color: rgba(201,138,45,.8); }

/* 声波条：9 根，随机节奏 */
.dh-wave { position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%); display: flex; gap: 3px; opacity: 0; transition: opacity .25s; background: rgba(255,255,255,.75); padding: 4px 8px; border-radius: 10px; backdrop-filter: blur(4px); }
.dh-wave span { width: 3px; height: 14px; border-radius: 2px; background: #1f4e79; animation: dhWave 0.9s ease-in-out infinite; }
.dh-wave span:nth-child(1){animation-delay:0s} .dh-wave span:nth-child(2){animation-delay:.08s}
.dh-wave span:nth-child(3){animation-delay:.18s} .dh-wave span:nth-child(4){animation-delay:.05s}
.dh-wave span:nth-child(5){animation-delay:.25s} .dh-wave span:nth-child(6){animation-delay:.12s}
.dh-wave span:nth-child(7){animation-delay:.3s} .dh-wave span:nth-child(8){animation-delay:.2s}
.dh-wave span:nth-child(9){animation-delay:.03s}
.digital-human-card.speaking .dh-wave { opacity: 1; }
.digital-human-card.speaking .dh-media img { animation: dhBob 0.9s ease-in-out infinite; }

@keyframes dhWave { 0%,100% { transform: scaleY(.4); } 50% { transform: scaleY(1.3); } }
@keyframes dhPulse { 0%,100% { box-shadow: 0 0 0 0 rgba(47,111,168,.3); } 50% { box-shadow: 0 0 0 14px rgba(47,111,168,0); } }
@keyframes dhThink { 0%,100% { box-shadow: 0 0 0 0 rgba(201,138,45,.3); } 50% { box-shadow: 0 0 0 8px rgba(201,138,45,0); } }
@keyframes dhBob { 0%,100% { transform: translateY(0) scale(1); } 50% { transform: translateY(-4px) scale(1.008); } }

.dh-info { display: flex; align-items: center; justify-content: space-between; margin: 14px 0 10px; }
.dh-name { font-weight: 700; color: #16293d; font-size: 15px; }
.dh-status { font-size: 12px; color: #5a6b7c; display: flex; align-items: center; gap: 5px; }
.dh-status .status-dot { width: 8px; height: 8px; border-radius: 50%; background: #2f6fa8; display: inline-block; }
.dh-status .status-dot.offline { background: #C98A2D; }

.dh-speech { background: #fff; border: 1px solid #dde5ee; border-radius: 12px; padding: 10px 12px; font-size: 12.5px; line-height: 1.6; color: #3d5a75; min-height: 58px; position: relative; margin-bottom: 14px; }
.dh-speech::before { content: ""; position: absolute; top: -6px; left: 22px; width: 12px; height: 12px; background: #fff; border-left: 1px solid #dde5ee; border-top: 1px solid #dde5ee; transform: rotate(45deg); }

.dh-tips-title { font-size: 12px; color: #7a8a9a; margin-bottom: 8px; }
.dh-tips .quick-question { display: block; width: 100%; text-align: left; margin-bottom: 6px; font-size: 12.5px; padding: 8px 10px; }

@media (max-width: 960px) {
    .tutor-layout { grid-template-columns: 1fr; }
    .digital-human-card { position: static; display: grid; grid-template-columns: 120px 1fr; gap: 14px; align-items: center; }
    .dh-stage { aspect-ratio: 1/1; grid-row: span 4; }
    .dh-tips { display: none; }
}

/* =========================================================
   13. 模型实验室：预设情景
   ========================================================= */

.preset-row { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0 16px; }
.preset-chip { border: 1px solid #d6e0ec; background: #fff; color: #3d5a75; font-size: 12px; padding: 6px 11px; border-radius: 999px; cursor: pointer; transition: .18s; }
.preset-chip:hover { border-color: #9CC6B2; }
.preset-chip.active { background: #1f4e79; border-color: #1f4e79; color: #fff; font-weight: 600; box-shadow: 0 3px 8px rgba(47,125,91,.25); }

/* =========================================================
   14. 政策模拟 v2
   ========================================================= */

.score-meter { background: #fff; border: 1px solid #dde5ee; border-radius: 12px; padding: 12px 14px; margin-bottom: 14px; }
.score-meter-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; font-size: 13px; color: #5a6b7c; }
.score-meter-head strong { font-size: 20px; color: #C98A2D; }
.score-meter-scale { display: flex; justify-content: space-between; font-size: 10.5px; color: #9AA69F; margin-top: 5px; }

.policy-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.policy-actions .hidden { display: none; }

.policy-history { margin-top: 20px; border-top: 1px dashed #d6e0ec; padding-top: 14px; }
.policy-history h4 { font-size: 14px; color: #16293d; margin: 0 0 12px; }
.policy-history-empty { background: #f5f8fb; border: 1px dashed #d6e0ec; border-radius: 10px; padding: 14px; font-size: 12.5px; color: #7a8a9a; }
.policy-timeline { display: flex; flex-direction: column; gap: 10px; }
.pt-item { display: flex; gap: 12px; background: #f5f8fb; border: 1px solid #e3ebf3; border-radius: 10px; padding: 10px 12px; }
.pt-round { flex-shrink: 0; background: #1f4e79; color: #fff; font-size: 11.5px; font-weight: 700; height: fit-content; padding: 4px 9px; border-radius: 999px; }
.pt-body { flex: 1; min-width: 0; }
.pt-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.pt-head strong { font-size: 13.5px; color: #2a4a66; }
.pt-badge { font-size: 11.5px; font-weight: 600; padding: 2px 8px; border-radius: 999px; }
.pt-badge.good { background: #e0ecf6; color: #1f4e79; }
.pt-badge.mid { background: #FBF0DC; color: #B07A1E; }
.pt-badge.bad { background: #F9EAE7; color: #8F3A2A; }
.pt-sub { font-size: 12px; color: #7a8a9a; margin-top: 4px; }

/* =========================================================
   15. 数据管理弹窗
   ========================================================= */

.data-block { border: 1px solid #dde5ee; border-radius: 12px; padding: 14px; margin-bottom: 12px; background: #f7fafd; }
.data-block-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.data-block-head strong { font-size: 14px; color: #2a4a66; }
.data-status { font-size: 12px; color: #5a6b7c; }
.data-block-actions { display: flex; gap: 10px; }
.file-upload { position: relative; cursor: pointer; font-size: 13px; }
.data-schema { margin-top: 12px; background: #f5f8fb; border: 1px solid #e3ebf3; border-radius: 10px; padding: 10px 14px; font-size: 12.5px; color: #6a7b8c; line-height: 1.7; }
.data-schema summary { cursor: pointer; color: #1f4e79; font-weight: 600; }
.data-schema code { background: #e8eef5; padding: 1px 5px; border-radius: 4px; font-size: 12px; }

/* =========================================================
   16. 页面规范化细节
   ========================================================= */

body { background-color: #f5f8fb; background-image: radial-gradient(rgba(47,125,91,.045) 1px, transparent 1px); background-size: 22px 22px; }
.header { box-shadow: 0 1px 0 rgba(20,60,40,.06), 0 8px 24px rgba(20,60,40,.04); }
.nav-item { position: relative; }
.nav-item.active::after { content: ""; position: absolute; left: 50%; transform: translateX(-50%); bottom: -14px; width: 22px; height: 3px; border-radius: 3px; background: #1f4e79; }
:focus-visible { outline: 2px solid #2f6fa8; outline-offset: 2px; }
.page-header h1 { margin-bottom: 6px; }
.chat-window { border-radius: 18px; overflow: hidden; box-shadow: 0 10px 32px rgba(20,60,40,.07); }
.send-button { border-radius: 0 14px 14px 0; }
.model-tabs { gap: 8px; flex-wrap: wrap; }
.model-tab { border-radius: 10px; }
.verdict-badge.good, .verdict-badge.mid, .verdict-badge.bad { display: inline-block; }

/* =========================
   在线题库 v2（练题软件式）
   ========================= */
.quiz-chapter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 18px 0 14px;
}
.quiz-chapter-chip {
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border, #d5dee8);
    background: var(--card, #fff);
    color: var(--text, #1f2d3d);
    font-size: 13px;
    cursor: pointer;
    transition: all .18s ease;
}
.quiz-chapter-chip:hover { border-color: #4a7fb5; color: #2f6ba8; }
.quiz-chapter-chip.active {
    background: #2f6ba8;
    border-color: #2f6ba8;
    color: #fff;
    box-shadow: 0 2px 8px rgba(47,107,168,.3);
}
.quiz-filter-row {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 16px;
    padding: 12px 16px;
    background: var(--bg-soft, #f4f7fa);
    border-radius: 12px;
}
.quiz-filter-group { display: flex; align-items: center; gap: 8px; }
.quiz-filter-label { font-size: 12px; color: #6b7a8c; white-space: nowrap; }
.quiz-filter-group select {
    padding: 6px 10px;
    border: 1px solid var(--border, #d5dee8);
    border-radius: 8px;
    background: #fff;
    font-size: 13px;
    color: var(--text, #1f2d3d);
    max-width: 200px;
}
.quiz-filter-spacer { flex: 1; }
.quiz-filter-count { font-size: 13px; color: #6b7a8c; }
.quiz-filter-count strong { color: #2f6ba8; font-size: 16px; }
.q-difficulty { color: #e8a33d; font-weight: 700; letter-spacing: 1px; }
.q-points { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 14px; }
.q-point-chip {
    padding: 3px 10px;
    border-radius: 12px;
    background: #eaf1f8;
    color: #2f6ba8;
    font-size: 12px;
}
.q-video {
    margin-top: 14px;
    padding: 12px;
    border: 1px solid #dbe7f3;
    border-radius: 12px;
    background: #f8fbfe;
}
.q-video-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 13px;
    font-weight: 600;
    color: #2f6ba8;
}
.q-video-title { font-weight: 400; color: #6b7a8c; font-size: 12px; }
.q-video iframe { width: 100%; height: 260px; border-radius: 8px; }
.q-video video { width: 100%; border-radius: 8px; }
.quiz-card-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-top: 14px;
}
.quiz-card-hint { font-size: 11px; color: #8a97a6; }

/* =========================
   政策模拟 v3（角色扮演 · 步骤化）
   ========================= */
.pol-step-block { margin-bottom: 18px; }
.pol-step-title { margin-bottom: 12px; }
.pol-step-title h2 { font-size: 20px; margin: 2px 0 4px; }
.pol-step-title p { color: #6b7a8c; font-size: 13px; }
.pol-step-no {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    background: #2f6ba8;
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
}
.pol-roles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
}
.pol-role-card {
    display: flex;
    gap: 12px;
    padding: 18px;
    border: 1px solid var(--border, #d5dee8);
    border-radius: 14px;
    background: var(--card, #fff);
    text-align: left;
    cursor: pointer;
    transition: all .2s ease;
}
.pol-role-card:hover {
    border-color: #2f6ba8;
    box-shadow: 0 6px 18px rgba(47,107,168,.12);
    transform: translateY(-2px);
}
.pol-role-icon {
    font-size: 34px;
    line-height: 1.2;
    flex-shrink: 0;
}
.pol-role-info strong { display: block; font-size: 17px; color: var(--text, #1f2d3d); }
.pol-role-info em { display: block; font-size: 12px; color: #2f6ba8; margin: 2px 0 6px; font-style: normal; }
.pol-role-info p { font-size: 12.5px; color: #5b6b7c; line-height: 1.6; margin: 0 0 8px; }
.pol-role-tools {
    display: block;
    font-size: 11.5px;
    color: #8a97a6;
    line-height: 1.5;
}
.pol-brief {
    margin-bottom: 16px;
    padding: 16px 18px;
    border-left: 4px solid #2f6ba8;
    border-radius: 10px;
    background: #f4f8fc;
}
.pol-brief-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}
.pol-brief-role { font-weight: 700; font-size: 14px; color: #2f6ba8; }
.pol-brief-round {
    font-size: 12px;
    padding: 3px 10px;
    border-radius: 12px;
    background: #2f6ba8;
    color: #fff;
}
.pol-brief-intro { margin: 0 0 10px; font-size: 13.5px; line-height: 1.7; color: #33455a; }
.pol-brief-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 10px;
}
.pol-brief-grid > div {
    padding: 8px 10px;
    background: #fff;
    border-radius: 8px;
    text-align: center;
}
.pol-brief-grid span { display: block; font-size: 11px; color: #8a97a6; }
.pol-brief-grid strong { font-size: 18px; color: var(--text, #1f2d3d); }
.pol-brief-goal { margin: 0; font-size: 12.5px; color: #5b6b7c; line-height: 1.6; }
.policy-tooltip {
    font-size: 12px;
    color: #8a6d3b;
    background: #fdf6e8;
    border: 1px solid #f0e2c0;
    border-radius: 8px;
    padding: 8px 12px;
    margin-bottom: 12px;
    line-height: 1.5;
}
.policy-next {
    margin-top: 14px;
    padding: 14px 16px;
    border: 1px solid #dbe7f3;
    border-radius: 12px;
    background: #f8fbfe;
}
.policy-next-head {
    font-weight: 700;
    font-size: 14px;
    color: #2f6ba8;
    margin-bottom: 10px;
}
.policy-next-item {
    display: flex;
    gap: 10px;
    padding: 8px 0;
    border-bottom: 1px dashed #e2ebf3;
    font-size: 13px;
    line-height: 1.6;
    color: #33455a;
}
.policy-next-item:last-child { border-bottom: none; }
.policy-next-item p { margin: 0; }
.policy-next-item.danger .pn-icon { color: #d64545; }
.policy-next-item.warn .pn-icon { color: #e8a33d; }
.policy-next-item.good .pn-icon { color: #2e9e5b; }
.policy-next-item.info .pn-icon { color: #4a7fb5; }
.pol-final-card {
    padding: 26px;
    border-radius: 16px;
    border: 1px solid var(--border, #d5dee8);
    background: var(--card, #fff);
}
.pol-final-head { text-align: center; margin-bottom: 16px; }
.pol-final-head h2 { margin: 8px 0 4px; }
.pol-final-head p { color: #6b7a8c; font-size: 13px; }
.pol-final-badge {
    display: inline-block;
    padding: 4px 16px;
    border-radius: 16px;
    font-size: 13px;
    font-weight: 700;
}
.pol-final-badge.good { background: #e3f4ea; color: #2e9e5b; }
.pol-final-badge.mid { background: #fdf3e0; color: #c07f1a; }
.pol-final-badge.bad { background: #fbe5e5; color: #d64545; }
.pol-final-score {
    text-align: center;
    padding: 14px;
    background: #f4f8fc;
    border-radius: 12px;
    margin-bottom: 14px;
}
.pol-final-score span { font-size: 12px; color: #6b7a8c; margin-right: 6px; }
.pol-final-score strong { font-size: 40px; color: #2f6ba8; }
.pol-final-score em { font-size: 14px; color: #8a97a6; font-style: normal; }
.pol-final-score .score-bar { margin-top: 8px; }
.pol-final-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 14px;
}
.pol-final-grid > div {
    padding: 12px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border, #d5dee8);
}
.pol-final-grid > div.ok { background: #f0f9f4; border-color: #cdeeda; }
.pol-final-grid > div.bad { background: #fdf2f2; border-color: #f3d6d6; }
.pol-final-grid span { display: block; font-size: 11px; color: #8a97a6; }
.pol-final-grid strong { font-size: 20px; }
.pol-final-grid em { display: block; font-size: 11px; font-style: normal; margin-top: 2px; }
.pol-final-grid > div.ok em { color: #2e9e5b; }
.pol-final-grid > div.bad em { color: #d64545; }
.pol-final-verdict {
    padding: 14px 16px;
    border-radius: 10px;
    font-size: 13.5px;
    line-height: 1.6;
    margin-bottom: 14px;
}
.pol-final-verdict.good { background: #e3f4ea; color: #1f7a45; }
.pol-final-verdict.warn { background: #fdf3e0; color: #8a5a10; }
.pol-final-reflect h4 { margin: 0 0 10px; }
.pol-final-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 16px;
    flex-wrap: wrap;
}
/* ===== 政策模拟 v4：组合决策 + 类别分组 ===== */
.policy-cat { font-size: 13px; font-weight: 700; color: #7c8db5; margin: 18px 0 8px; letter-spacing: 2px; }
.policy-cat:first-child { margin-top: 0; }
.policy-item { border: 1px solid #2c3a5c !important; border-radius: 12px !important; padding: 12px 14px !important; transition: all .18s ease; }
.policy-item:hover { border-color: #4f7cff !important; background: rgba(79,124,255,.08) !important; }
.policy-item.selected { border-color: #4f7cff !important; background: rgba(79,124,255,.18) !important; box-shadow: 0 0 0 1px #4f7cff inset; }
.policy-item.selected strong { color: #7da2ff; }
.policy-tip-extra { color: #4f7cff; font-weight: 600; }
.pt-reaction { margin-top: 8px; padding: 8px 10px; background: rgba(79,124,255,.07); border-left: 3px solid #4f7cff; border-radius: 6px; font-size: 13px; color: #aab8d8; }
#policy-reaction { display: flex; gap: 10px; align-items: flex-start; margin: 14px 0; padding: 12px 14px; background: rgba(255,193,7,.08); border: 1px solid rgba(255,193,7,.25); border-radius: 10px; }
#policy-reaction p { margin: 0; font-size: 13.5px; color: #e8d9a0; line-height: 1.7; }
.policy-reaction-icon { font-size: 18px; }

/* ===== AI 顾问浮窗（数字人） ===== */
.advisor-fab { position: fixed; right: 22px; bottom: 24px; z-index: 9999; width: 64px; height: 64px; border-radius: 50%; cursor: pointer; box-shadow: 0 6px 24px rgba(0,0,0,.45); border: 2px solid rgba(79,124,255,.6); transition: transform .2s ease, box-shadow .2s ease; background: #111a2e; }
.advisor-fab:hover { transform: scale(1.08); box-shadow: 0 8px 30px rgba(79,124,255,.35); }
.advisor-fab img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; display: block; }
.advisor-fab-dot { position: absolute; right: 2px; bottom: 2px; width: 14px; height: 14px; background: #34c759; border: 2.5px solid #111a2e; border-radius: 50%; }
.advisor-fab.active { transform: scale(.96); }
.advisor-panel { position: fixed; right: 22px; bottom: 98px; z-index: 9999; width: 360px; max-width: calc(100vw - 30px); height: 520px; max-height: calc(100vh - 130px); background: #0d1526; border: 1px solid #2c3a5c; border-radius: 16px; display: flex; flex-direction: column; box-shadow: 0 16px 48px rgba(0,0,0,.6); overflow: hidden; }
.advisor-head { display: flex; align-items: center; gap: 10px; padding: 12px 14px; background: linear-gradient(135deg, #16233f, #0f1a30); border-bottom: 1px solid #2c3a5c; }
.advisor-head-avatar { width: 40px; height: 40px; border-radius: 50%; object-fit: cover; border: 2px solid rgba(79,124,255,.5); }
.advisor-head strong { display: block; font-size: 15px; color: #e8eefc; }
.advisor-head span { font-size: 11.5px; color: #7c8db5; }
.advisor-close { margin-left: auto; background: none; border: none; color: #7c8db5; font-size: 16px; cursor: pointer; padding: 4px 8px; border-radius: 6px; }
.advisor-close:hover { background: rgba(255,255,255,.06); color: #fff; }
.advisor-ctx { padding: 8px 14px; background: rgba(79,124,255,.08); border-bottom: 1px solid #223052; font-size: 12px; color: #9fb0d4; line-height: 1.6; }
.advisor-ctx em { font-style: normal; }
.advisor-msgs { flex: 1; overflow-y: auto; padding: 12px 14px; display: flex; flex-direction: column; gap: 10px; }
.advisor-msg { display: flex; gap: 8px; align-items: flex-start; }
.advisor-msg.user { justify-content: flex-end; }
.advisor-msg-icon { font-size: 17px; line-height: 22px; }
.advisor-bubble { max-width: 82%; padding: 9px 12px; border-radius: 12px; background: #1a2740; color: #dbe4f5; font-size: 13.5px; line-height: 1.65; border: 1px solid #2c3a5c; }
.advisor-bubble.user-bubble { background: #24407a; border-color: #3b5db3; }
.advisor-bubble-typing { display: flex; gap: 5px; align-items: center; padding: 12px 14px; }
.advisor-bubble-typing .dot { width: 7px; height: 7px; border-radius: 50%; background: #7c8db5; animation: adDot 1.2s infinite ease-in-out; }
.advisor-bubble-typing .dot:nth-child(2) { animation-delay: .2s; }
.advisor-bubble-typing .dot:nth-child(3) { animation-delay: .4s; }
@keyframes adDot { 0%,80%,100% { opacity: .3; transform: translateY(0); } 40% { opacity: 1; transform: translateY(-4px); } }
.advisor-quick { display: flex; gap: 8px; padding: 8px 12px; border-top: 1px solid #223052; flex-wrap: wrap; }
.advisor-quick button { background: rgba(79,124,255,.1); border: 1px solid rgba(79,124,255,.35); color: #a9c0ff; border-radius: 20px; padding: 6px 12px; font-size: 12px; cursor: pointer; transition: all .15s ease; }
.advisor-quick button:hover { background: rgba(79,124,255,.22); color: #d6e2ff; }
.advisor-input { display: flex; gap: 8px; padding: 10px 12px; border-top: 1px solid #2c3a5c; }
.advisor-input input { flex: 1; background: #111c33; border: 1px solid #2c3a5c; border-radius: 20px; padding: 9px 14px; color: #e8eefc; font-size: 13.5px; outline: none; }
.advisor-input input:focus { border-color: #4f7cff; }
.advisor-input button { background: #4f7cff; border: none; border-radius: 20px; padding: 9px 18px; color: #fff; font-size: 13.5px; cursor: pointer; }
.advisor-input button:disabled { opacity: .5; cursor: not-allowed; }

/* ============================================
   X. 学习增强系统：打卡/等级/雷达/徽章/模拟考试
   ============================================ */

/* 首页驾驶舱双指标 */
.dash-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 14px 0; }
.dash-metric { background: var(--card-bg, #fff); border: 1px solid var(--border, #e3e8f2); border-radius: 12px; padding: 12px 14px; }
.streak-num { display: flex; align-items: baseline; gap: 6px; }
.streak-num strong { font-size: 24px; color: #ff7a45; }
.streak-num span { font-size: 12px; color: var(--text-2, #6b7688); }
.streak-btn { display: block; width: 100%; margin-top: 8px; padding: 6px 0; border: 0; border-radius: 8px;
  background: linear-gradient(135deg, #ff9a56, #ff6b2c); color: #fff; font-size: 12px; cursor: pointer; }
.streak-btn.done { background: var(--bg-2, #f0f4fa); color: var(--text-2, #6b7688); cursor: default; }
.streak-sub { margin-top: 6px; font-size: 11px; color: var(--text-3, #98a2b3); }
.xp-head { display: flex; justify-content: space-between; align-items: center; }
.xp-level span { font-size: 11px; color: var(--primary, #4f7cff); font-weight: 700; margin-right: 6px; }
.xp-level strong { font-size: 13px; color: var(--text-1, #1f2a44); }
.xp-num { font-size: 13px; font-weight: 700; color: var(--primary, #4f7cff); }
.xp-bar { margin-top: 8px; }
.xp-sub { margin-top: 6px; font-size: 11px; color: var(--text-3, #98a2b3); }

/* 学习中心：打卡/等级条 */
.ach-bar { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 16px 0 6px; }
.ach-col { background: var(--card-bg, #fff); border: 1px solid var(--border, #e3e8f2); border-radius: 14px; padding: 16px 18px; }

/* 雷达图与薄弱点 */
.insight-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 22px 0; }
.insight-card { background: var(--card-bg, #fff); border: 1px solid var(--border, #e3e8f2); border-radius: 14px; padding: 18px; }
.insight-card h2 { margin: 4px 0 12px; font-size: 17px; color: var(--text-1, #1f2a44); }
.wp-item { display: grid; grid-template-columns: 26px 1fr; gap: 4px 10px; align-items: center; padding: 9px 0; border-bottom: 1px dashed var(--border, #e3e8f2); }
.wp-item:last-child { border-bottom: 0; }
.wp-rank { width: 22px; height: 22px; border-radius: 50%; background: #ffe9e0; color: #ff6b2c; font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center; }
.wp-info strong { display: block; font-size: 13px; color: var(--text-1, #1f2a44); }
.wp-info span { font-size: 11px; color: var(--text-2, #6b7688); }
.wp-item .score-bar { grid-column: 1 / -1; }

/* 成就徽章 */
.badge-section { background: var(--card-bg, #fff); border: 1px solid var(--border, #e3e8f2); border-radius: 14px; padding: 18px; margin-top: 6px; }
.badge-section h2 { margin: 4px 0 14px; font-size: 17px; color: var(--text-1, #1f2a44); }
.badge-wall { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.badge-item { border: 1px solid var(--border, #e3e8f2); border-radius: 12px; padding: 12px; text-align: center;
  background: var(--bg-2, #f6f8fc); opacity: .55; transition: all .2s; }
.badge-item.got { opacity: 1; background: linear-gradient(160deg, #eef3ff, #fff); border-color: #c9d8ff; }
.badge-icon { font-size: 28px; margin-bottom: 6px; }
.badge-item strong { display: block; font-size: 13px; color: var(--text-1, #1f2a44); }
.badge-item span { display: block; margin-top: 3px; font-size: 11px; color: var(--text-3, #98a2b3); line-height: 1.4; }

/* 模拟考试入口 */
.exam-entry-btn { margin-left: 10px; padding: 8px 14px; border: 0; border-radius: 9px; font-size: 13px; cursor: pointer;
  background: linear-gradient(135deg, #4f7cff, #6a5cff); color: #fff; box-shadow: 0 4px 12px rgba(79, 124, 255, .25); }
.exam-entry-btn:hover { filter: brightness(1.06); }

/* 考试弹窗 */
.exam-modal { background: var(--card-bg, #fff); border-radius: 16px; max-width: 720px; width: 94%; max-height: 88vh;
  overflow-y: auto; padding: 20px 22px; }
.exam-head { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 14px; }
.exam-head h3 { margin: 2px 0 0; font-size: 19px; color: var(--text-1, #1f2a44); }
.exam-timer { font-size: 22px; font-weight: 800; color: var(--primary, #4f7cff); font-variant-numeric: tabular-nums; }
.exam-topbar { display: flex; justify-content: space-between; font-size: 13px; color: var(--text-2, #6b7688); margin-bottom: 10px; }
.exam-question { background: var(--bg-2, #f6f8fc); border-radius: 12px; padding: 16px; margin-bottom: 14px; }
.exam-q-meta { font-size: 12px; color: var(--primary, #4f7cff); margin-bottom: 8px; }
.exam-question p { margin: 0; font-size: 15px; line-height: 1.7; color: var(--text-1, #1f2a44); }
.exam-options { display: grid; gap: 8px; margin-bottom: 14px; }
.exam-opt { display: flex; align-items: center; gap: 10px; padding: 11px 14px; border: 1px solid var(--border, #e3e8f2);
  border-radius: 10px; background: #fff; cursor: pointer; font-size: 14px; text-align: left; color: var(--text-1, #1f2a44); transition: all .15s; }
.exam-opt:hover { border-color: var(--primary, #4f7cff); }
.exam-opt.selected { border-color: var(--primary, #4f7cff); background: #eef3ff; }
.eo-letter { width: 22px; height: 22px; border-radius: 50%; background: var(--bg-2, #eef1f7); color: var(--text-2, #6b7688);
  font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.exam-opt.selected .eo-letter { background: var(--primary, #4f7cff); color: #fff; }
.exam-nav { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.exam-card { display: grid; grid-template-columns: repeat(auto-fill, minmax(34px, 1fr)); gap: 6px; }
.ecell { height: 32px; border: 1px solid var(--border, #e3e8f2); border-radius: 7px; background: #fff; font-size: 12px;
  color: var(--text-2, #6b7688); cursor: pointer; }
.ecell.done { background: #e6f4ea; border-color: #b7e0c4; color: #2e9e5b; }
.ecell.cur { border-color: var(--primary, #4f7cff); box-shadow: 0 0 0 2px rgba(79, 124, 255, .2); color: var(--primary, #4f7cff); font-weight: 700; }
.danger-button { padding: 9px 18px; border: 0; border-radius: 9px; background: #ff6b6b; color: #fff; font-size: 13px; cursor: pointer; }
.exam-result { text-align: center; padding: 18px 0; }
.exam-score { display: flex; align-items: baseline; justify-content: center; gap: 4px; margin-bottom: 6px; }
.exam-score strong { font-size: 52px; line-height: 1; }
.exam-score span { font-size: 18px; color: var(--text-2, #6b7688); }
.exam-score.good strong { color: #2e9e5b; }
.exam-score.mid strong { color: #f59e0b; }
.exam-score.bad strong { color: #ff6b6b; }
.exam-result-meta { font-size: 14px; color: var(--text-2, #6b7688); margin-bottom: 16px; }
.exam-detail { text-align: left; background: var(--bg-2, #f6f8fc); border-radius: 12px; padding: 14px 16px; margin-bottom: 16px; }
.exam-detail h4 { margin: 0 0 10px; font-size: 14px; color: var(--text-1, #1f2a44); }
.exam-detail-item { padding: 8px 0; border-bottom: 1px dashed var(--border, #e3e8f2); }
.exam-detail-item:last-child { border-bottom: 0; }
.exam-detail-item p { margin: 0 0 4px; font-size: 13px; color: var(--text-1, #1f2a44); }
.exam-detail-item span { display: block; font-size: 12px; color: #ff6b6b; margin: 2px 0; }
.exam-detail-item b { font-size: 12px; color: #2e9e5b; }
.exam-clean { text-align: center; font-size: 15px; color: #2e9e5b; padding: 20px; }
.exam-actions { display: flex; justify-content: center; gap: 12px; }

@media (max-width: 720px) {
    .dash-metrics, .ach-bar, .insight-grid { grid-template-columns: 1fr; }
}

/* ============ 政策模拟 v5：事件系统 + 派生指标 ============ */
.pol-event-card {
    margin: 10px 0 14px;
    padding: 10px 14px;
    border-left: 4px solid #e8684a;
    background: linear-gradient(90deg, rgba(232,104,74,.08), transparent);
    border-radius: 0 10px 10px 0;
}
.pol-event-card .pol-event-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    color: #e8684a;
    background: rgba(232,104,74,.12);
    padding: 2px 8px;
    border-radius: 20px;
    margin-bottom: 4px;
}
.pol-event-card strong { display: block; font-size: 14px; color: #2f3b52; margin: 2px 0; }
.pol-event-card p { margin: 2px 0; font-size: 12.5px; color: #5a6a85; line-height: 1.6; }
.pol-event-card .pol-event-eff { display: inline-block; font-size: 11.5px; color: #b4553f; margin-top: 4px; }

#policy-event.hidden { display: none; }
#policy-event:not(.hidden) {
    margin-top: 8px;
    padding: 10px 14px;
    border: 1px dashed #e8684a;
    border-radius: 10px;
    background: rgba(232,104,74,.06);
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
#policy-event .policy-event-icon { font-size: 18px; line-height: 1.4; }
#policy-event p { margin: 0; font-size: 13px; color: #3a4a63; line-height: 1.6; }

.pt-event {
    margin-top: 6px;
    font-size: 12px;
    color: #b4553f;
    background: rgba(232,104,74,.08);
    padding: 4px 8px;
    border-radius: 6px;
    display: inline-block;
}

.pol-final-comment {
    margin-top: 14px;
    padding: 14px 16px;
    background: linear-gradient(135deg, rgba(91,143,249,.08), rgba(146,112,202,.08));
    border-radius: 12px;
    border: 1px solid rgba(91,143,249,.18);
}
.pol-final-comment h4 { margin: 0 0 6px; font-size: 13px; color: #2f3b52; }
.pol-final-comment p { margin: 0; font-size: 13.5px; color: #3a4a63; line-height: 1.8; }

.traj-wrap {
    margin-top: 16px;
    padding: 14px 16px;
    background: #fff;
    border: 1px solid #e6ecf5;
    border-radius: 12px;
}
.traj-wrap h4 { margin: 0 0 10px; font-size: 13px; color: #2f3b52; }
.traj-svg { width: 100%; max-width: 620px; height: auto; display: block; margin: 0 auto; background: #fbfcfe; border-radius: 8px; }
.traj-legend-box { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 10px; }
.traj-legend { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; color: #5a6a85; }
.traj-legend i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }

.pol-final-events {
    margin-top: 14px;
    padding: 12px 16px;
    background: #fffdfa;
    border: 1px solid #f3e2d0;
    border-radius: 12px;
}
.pol-final-events h4 { margin: 0 0 8px; font-size: 13px; color: #2f3b52; }
.pol-final-events ul { margin: 0; padding-left: 18px; }
.pol-final-events li { font-size: 12.5px; color: #5a6a85; line-height: 1.9; }
.pol-final-events li b { color: #b4553f; }

/* ============ 模型实验室 v2：对比模式 ============ */
.model-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}
.model-toolbar .tool-btn {
    border: 1px solid #d5dff0;
    background: #f6f9ff;
    color: #3a5a8c;
    font-size: 12.5px;
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all .15s;
}
.model-toolbar .tool-btn:hover { background: #e8f0ff; border-color: #9db8e8; }
.model-toolbar .tool-btn.active { background: #2e5da8; border-color: #2e5da8; color: #fff; }

.result-tile .cmp-delta {
    display: block;
    margin-top: 3px;
    font-size: 11px;
    font-style: normal;
    font-weight: 700;
}
.result-tile .cmp-delta.up { color: #e0533d; }
.result-tile .cmp-delta.down { color: #1f9d7a; }

.model-takeaway {
    margin-top: 14px;
    padding: 12px 14px;
    background: linear-gradient(135deg, rgba(250,204,21,.10), rgba(250,204,21,.04));
    border: 1px solid rgba(250,204,21,.35);
    border-radius: 10px;
    display: flex;
    gap: 10px;
    align-items: flex-start;
}
.model-takeaway .mt-icon { font-size: 16px; line-height: 1.5; }
.model-takeaway p { margin: 0; font-size: 13px; color: #5a5335; line-height: 1.75; }

/* ============ 知识图谱学习地图 ============ */
.map-section {
    margin: 22px 0 10px;
    padding: 18px 20px;
    background: linear-gradient(135deg, #f7faff, #fdfdff);
    border: 1px solid #e2eaf8;
    border-radius: 14px;
}
.map-section h2 { margin: 4px 0 6px; font-size: 19px; color: #223052; }
.map-section .map-sub { margin: 0 0 12px; font-size: 12.5px; color: #6b7a99; line-height: 1.7; }
.map-sub i { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin: 0 3px 0 8px; vertical-align: -1px; }
.map-sub .dot-green { background: #2fa87c; }
.map-sub .dot-blue { background: #4f7cff; }
.map-sub .dot-gray { background: #ccd5e4; }
.km-svg { width: 100%; max-width: 1080px; height: auto; display: block; margin: 0 auto; background: #fff; border-radius: 12px; border: 1px solid #eef2f9; }
.km-node { transition: opacity .15s; }
.km-node:hover rect { stroke-width: 2.6; filter: drop-shadow(0 2px 6px rgba(47,84,160,.18)); }
.km-node text { user-select: none; }

/* ============ SRS 间隔复习 ============ */
.review-section {
    margin-top: 18px;
    padding: 18px 20px;
    background: linear-gradient(135deg, #fff9f2, #fffdf9);
    border: 1px solid #f0dfc8;
    border-radius: 14px;
}
.review-section h2 { margin: 4px 0 6px; font-size: 19px; color: #223052; display: flex; align-items: center; gap: 10px; }
.review-count {
    background: #e8684a; color: #fff; font-size: 13px; font-weight: 700;
    padding: 2px 12px; border-radius: 20px;
}
.review-sub { margin: 0 0 12px; font-size: 12.5px; color: #7a6a52; line-height: 1.7; }
.review-stats { display: flex; gap: 14px; margin-bottom: 14px; }
.review-stats > div {
    flex: 1; text-align: center; padding: 12px 8px;
    background: #fff; border: 1px solid #f0e2d0; border-radius: 10px;
}
.review-stats strong { display: block; font-size: 22px; color: #2f3b52; }
.review-stats span { font-size: 12px; color: #8a7a62; }
.review-section .review-tip { margin: 10px 0 0; font-size: 12px; color: #9a8a72; }

.review-stage {
    font-size: 12px; color: #b4553f; background: rgba(232,104,74,.08);
    padding: 5px 10px; border-radius: 6px; margin-bottom: 10px; display: inline-block;
}
.review-opt {
    display: block; width: 100%; text-align: left; margin: 8px 0;
    padding: 12px 14px; border: 1.5px solid #dbe4f2; border-radius: 10px;
    background: #fff; color: #2f3b52; font-size: 14px; cursor: pointer;
    transition: all .15s;
}
.review-opt:hover { border-color: #4f7cff; background: #f4f8ff; }
.review-opt.right { border-color: #2fa87c; background: #e6f7ee; color: #1d7a58; font-weight: 600; }
.review-opt.wrong { border-color: #e0533d; background: #fdf0ee; color: #b0392a; }
.review-opt[disabled] { cursor: default; }
.review-feedback {
    margin-top: 12px; padding: 10px 14px; border-radius: 10px;
    background: #f2f6fd; border: 1px solid #dbe4f2; font-size: 13px; color: #3a4a63; line-height: 1.7;
}
.review-feedback em { display: block; margin-top: 4px; font-style: normal; color: #6b7a99; font-size: 12px; }
.review-result-icon { font-size: 46px; text-align: center; margin: 8px 0; }
.review-result-num { text-align: center; font-size: 18px; color: #2f3b52; margin: 8px 0; font-weight: 700; }
.review-result-tip { text-align: center; color: #6b7a99; font-size: 13px; margin: 6px 0 16px; }
#review-close { display: block; margin: 0 auto; }
.exam-close {
    border: none; background: #f0f3f8; color: #5a6a85; width: 30px; height: 30px;
    border-radius: 50%; font-size: 14px; cursor: pointer;
}
.exam-close:hover { background: #e2e8f2; }

/* ============ 排行榜 ============ */
.leaderboard-section {
    margin-top: 18px;
    padding: 18px 20px;
    background: linear-gradient(135deg, #f2f8ff, #f8fbff);
    border: 1px solid #dbe7f8;
    border-radius: 14px;
}
.leaderboard-section h2 { margin: 4px 0 6px; font-size: 19px; color: #223052; }
.lb-sub { margin: 0 0 12px; font-size: 12px; color: #7a8aa8; }
.lb-list { border: 1px solid #e4ecf8; border-radius: 10px; overflow: hidden; }
.lb-row {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 12px; background: #fff; border-bottom: 1px solid #eef3fa;
    font-size: 13px;
}
.lb-row:last-child { border-bottom: none; }
.lb-row.mine { background: #eef4ff; }
.lb-rank { width: 34px; text-align: center; font-weight: 700; color: #2f3b52; font-size: 15px; }
.lb-name { width: 110px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: #3a4a63; font-weight: 600; }
.lb-bar { flex: 1; height: 8px; background: #eef2f9; border-radius: 4px; overflow: hidden; }
.lb-bar i { display: block; height: 100%; background: linear-gradient(90deg, #4f7cff, #7da2ff); border-radius: 4px; }
.lb-row.mine .lb-bar i { background: linear-gradient(90deg, #2fa87c, #5ad8a6); }
.lb-num { width: 52px; text-align: right; color: #5a6a85; }
.lb-pct { width: 44px; text-align: right; color: #2e5da8; font-weight: 700; }
.lb-myrank {
    margin-top: 12px; padding: 10px 14px; background: #fff; border: 1px dashed #9db8e8;
    border-radius: 10px; font-size: 13px; color: #3a4a63;
}
.lb-myrank strong { color: #2e5da8; }
.lb-refresh { margin-top: 10px; }
.lb-empty { padding: 18px; text-align: center; color: #7a8aa8; font-size: 13.5px; line-height: 2; }
.lb-loading { padding: 18px; text-align: center; color: #7a8aa8; }

/* ============ 课程视频区 ============ */
.chapter-videos { margin-top: 14px; }
.chapter-videos h4 { font-size: 15px; font-weight: 700; color: #16324f; margin-bottom: 10px; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; }
.video-card {
    border: 1px solid #dbe7f3; border-radius: 12px; background: #f8fbfe;
    cursor: pointer; overflow: hidden; transition: box-shadow .15s, border-color .15s;
}
.video-card:hover { border-color: #6d9ed4; box-shadow: 0 3px 10px rgba(47,107,168,.12); }
.video-card-info { display: flex; align-items: center; gap: 10px; padding: 10px 12px; }
.video-card-play {
    flex: 0 0 auto; width: 34px; height: 34px; border-radius: 50%;
    background: linear-gradient(135deg,#2f6ba8,#4a8fd4); color: #fff;
    display: flex; align-items: center; justify-content: center; font-size: 13px;
}
.video-card-info h5 { margin: 0 0 3px; font-size: 13px; font-weight: 600; color: #16324f; line-height: 1.4; }
.video-card-src { font-size: 11px; color: #7a8aa8; }
.video-card-player iframe { width: 100%; height: 210px; border: 0; border-top: 1px solid #e3ecf6; }
.chapter-actions { margin-top: 16px; text-align: right; }

/* ============ 知识库 ============ */
.databank-tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.databank-tab {
    padding: 9px 18px; border-radius: 10px; border: 1px solid #dbe7f3; background: #fff;
    color: #4a6a8a; font-size: 13.5px; font-weight: 600; cursor: pointer; transition: all .15s;
}
.databank-tab.active { background: linear-gradient(135deg,#2f6ba8,#4a8fd4); color: #fff; border-color: transparent; box-shadow: 0 3px 10px rgba(47,107,168,.25); }
.db-filter { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.db-chip { font-size: 12px; padding: 6px 12px; }
.db-chip.active { background: #2f6ba8; color: #fff; border-color: transparent; }
.db-search { flex: 0 0 260px; padding: 8px 14px; border: 1px solid #dbe7f3; border-radius: 10px; font-size: 13px; outline: none; }
.db-search:focus { border-color: #6d9ed4; box-shadow: 0 0 0 3px rgba(47,107,168,.1); }

/* 案例 */
.case-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.case-card {
    border: 1px solid #dbe7f3; border-radius: 14px; padding: 16px; background: #f8fbfe;
    cursor: pointer; transition: box-shadow .15s, transform .15s, border-color .15s;
}
.case-card:hover { border-color: #6d9ed4; box-shadow: 0 6px 18px rgba(47,107,168,.12); transform: translateY(-2px); }
.case-top { display: flex; justify-content: space-between; margin-bottom: 8px; }
.case-period { font-size: 11.5px; font-weight: 700; color: #d9772e; background: #fdf0e3; padding: 3px 9px; border-radius: 6px; }
.case-ch { font-size: 11.5px; color: #7a8aa8; }
.case-card h4 { margin: 0 0 8px; font-size: 15px; color: #16324f; }
.case-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }
.case-brief { font-size: 12.5px; color: #6b7a8c; line-height: 1.6; margin: 0 0 10px; }
.case-open { font-size: 12.5px; color: #2f6ba8; font-weight: 600; border: none; background: none; padding: 0; cursor: pointer; }
.case-open:hover { text-decoration: underline; }
.case-detail {
    margin-top: 16px; border: 1px solid #d5e4f2; border-radius: 14px; padding: 20px;
    background: linear-gradient(180deg,#f4f9fe,#fff); box-shadow: 0 4px 16px rgba(47,107,168,.08);
}
.case-detail-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.case-detail-head h3 { margin: 0; font-size: 17px; color: #16324f; }
.case-block { margin-bottom: 12px; }
.case-block h5 { margin: 0 0 5px; font-size: 13px; color: #2f6ba8; }
.case-block p { margin: 0; font-size: 13.5px; line-height: 1.75; color: #3d5468; }
.case-actions { display: flex; gap: 10px; margin-top: 14px; }

/* 名词速查 */
.glossary-count { font-size: 12.5px; color: #7a8aa8; margin-bottom: 10px; }
.glossary-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.glossary-card { border: 1px solid #e0eaf4; border-radius: 12px; padding: 14px 16px; background: #fbfdff; }
.glossary-card h4 { margin: 0 0 6px; font-size: 14.5px; color: #16324f; }
.glossary-en { font-size: 11.5px; color: #8aa0b8; font-weight: 400; }
.glossary-def { margin: 0 0 8px; font-size: 13px; line-height: 1.65; color: #3d5468; }
.glossary-ch { font-size: 11px; color: #2f6ba8; background: #edf4fc; padding: 3px 8px; border-radius: 6px; }

/* 宏观数据 */
.macro-intro { font-size: 13px; color: #6b7a8c; margin-bottom: 14px; }
.macro-grid { display: grid; gap: 16px; }
.macro-card { border: 1px solid #dbe7f3; border-radius: 14px; padding: 16px 18px; background: #fbfdff; }
.macro-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; margin-bottom: 10px; }
.macro-head h4 { margin: 0; font-size: 15.5px; color: #16324f; }
.macro-unit { font-size: 12px; color: #8aa0b8; font-weight: 400; }
.macro-source { font-size: 11.5px; color: #8aa0b8; }
.macro-chart { margin: 6px 0 10px; }
.macro-note { margin: 0; font-size: 12.5px; line-height: 1.7; color: #6b7a8c; background: #f4f8fc; border-radius: 8px; padding: 10px 12px; }

/* ============ 学习报告 ============ */
.report-section {
    margin-top: 18px; border: 1px solid #d5e4f2; border-radius: 14px; padding: 18px 20px;
    background: linear-gradient(180deg,#f4f9fe,#fff); box-shadow: 0 4px 16px rgba(47,107,168,.08);
}
.report-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.report-head h3 { margin: 0; font-size: 16px; color: #16324f; }
.report-sub { margin: 3px 0 0; font-size: 12px; color: #7a8aa8; }
.report-content { margin-top: 10px; }
.report-empty { color: #8aa0b8; font-size: 13px; margin: 0; }
.report-text {
    background: #0f1f31; color: #dce8f5; border-radius: 12px; padding: 16px 18px;
    font-family: "SFMono-Regular", Consolas, "Courier New", monospace; font-size: 12.5px;
    line-height: 1.8; white-space: pre-wrap; overflow-x: auto; margin: 0 0 12px;
}
.report-actions { display: flex; gap: 10px; }
/* ============ 新增组件：作业 / 附件 / AI讲题 / 课程进度 ============ */
.hw-card { background:#fff; border:1px solid #e6edf5; border-radius:12px; padding:18px 20px; margin-bottom:14px; box-shadow:0 1px 4px rgba(20,40,80,.05); transition:box-shadow .2s; }
.hw-card:hover { box-shadow:0 4px 14px rgba(20,40,80,.10); }
.hw-card.hw-submitted { border-left:4px solid #2f9e6e; }
.hw-head { display:flex; justify-content:space-between; align-items:center; gap:10px; }
.hw-head h3 { margin:0; font-size:16px; color:#1f3a5f; }
.hw-status { font-size:12px; padding:3px 10px; border-radius:20px; background:#f0f4f9; color:#5a6b7c; white-space:nowrap; }
.hw-status.ok { background:#e2f0e9; color:#2f6b4f; }
.hw-status.late { background:#fdece9; color:#a13a2a; }
.hw-desc { color:#5a6b7c; font-size:13px; margin:8px 0; line-height:1.6; }
.hw-meta { font-size:12px; color:#8a97a8; margin-bottom:8px; }
.hw-feedback { background:#f7fafc; border-radius:8px; padding:8px 12px; font-size:13px; margin-bottom:8px; }
.hw-score { color:#1f4e79; font-weight:600; margin-right:10px; }
.hw-score.hw-pending { color:#b8860b; font-weight:400; }
.hw-comment { color:#5a6b7c; }
.hw-actions { display:flex; gap:8px; flex-wrap:wrap; }
.hw-actions .outline-button, .hw-actions .primary-button { margin:0; }
.hw-file-name { color:#5a6b7c; font-size:12px; margin-left:10px; }
.hw-mytext { background:#f7fafc; border-radius:8px; padding:10px; color:#5a6b7c; font-size:13px; margin:8px 0; }
.hw-panel-body textarea { width:100%; border:1px solid #cfdcea; border-radius:8px; padding:10px; font-size:14px; font-family:inherit; resize:vertical; }
.chat-attach-bar { display:flex; align-items:center; gap:8px; background:#f0f6ff; border:1px solid #d6e4f5; border-radius:8px; padding:6px 10px; margin:0 12px 6px; font-size:12px; color:#1f4e79; }
.chat-attach-remove { background:none; border:0; color:#8a97a8; font-size:16px; cursor:pointer; margin-left:auto; }
.chat-attach-info { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.ai-explain-box { margin-top:14px; background:linear-gradient(135deg,#f6f9ff,#eef4fb); border:1px solid #d6e4f5; border-radius:12px; padding:14px 16px; }
.ai-explain-head { font-weight:700; color:#1f4e79; margin-bottom:8px; font-size:14px; }
.ai-explain-body { font-size:13.5px; color:#2c4059; line-height:1.75; }
.ai-explain-body .btn-close { margin-top:10px; }
.chapter-progress { display:flex; align-items:center; gap:12px; margin:10px 0 4px; }
.cp-bar { flex:1; height:8px; background:#e8eef5; border-radius:6px; overflow:hidden; }
.cp-fill { height:100%; background:linear-gradient(90deg,#1f4e79,#2f8fc9); border-radius:6px; transition:width .4s; }
.cp-text { font-size:12px; color:#5a6b7c; white-space:nowrap; }
.lesson-card { position:relative; cursor:pointer; }
.lesson-card.lesson-done h4 { color:#2f8fc9; }
.lesson-done-mark { position:absolute; top:10px; right:14px; font-size:12px; color:#2f9e6e; }
/* ============ 番茄专注钟 ============ */
.pomodoro-section { margin: 22px 0; background: linear-gradient(135deg,#f8fafd,#eef3f9); border: 1px solid #e0e8f2; border-radius: 16px; padding: 18px 22px; }
.pomodoro-box { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; margin-top: 12px; }
.pomodoro-display { font-size: 44px; font-weight: 800; color: #1f4e79; letter-spacing: 2px; font-variant-numeric: tabular-nums; min-width: 180px; }
.pomodoro-controls { display: flex; gap: 10px; }
.pomodoro-stats { font-size: 13px; color: #5a6b7c; margin-left: auto; }
.pomodoro-controls .primary-button:disabled { opacity:.5; cursor:not-allowed; }