/* ============================================================
   姿态分析平台 · 设计系统（对齐画布「网站设计」稿）
   - 字体：Noto Sans SC（中文）+ Inter（拉丁/数字）
   - 底色 #FAFAFA / 卡片 #FFFFFF / 文字 #0A0A0B / 次文本 #52525B
   - 主色 #0071E3 · 管理员紫 #6D28D9 · 教师绿 #15803D
   - 卡片圆角 28px · 按钮胶囊圆角 99px · 玻璃导航模糊 32px
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;700&display=swap');

:root {
    --bg: #FAFAFA;
    --card-bg: #FFFFFF;
    --text: #0A0A0B;
    --text-secondary: #52525B;
    --accent: #0071E3;
    --accent-hover: #0077ED;
    --accent-soft: rgba(0,113,227,0.08);
    --accent-purple: #6D28D9;
    --accent-purple-soft: rgba(109,40,217,0.10);
    --accent-green: #15803D;
    --accent-green-soft: rgba(21,128,61,0.10);
    --border: #E5E5EA;
    --border-strong: #D2D2D7;
    --green: #34C759;
    --orange: #FF9500;
    --red: #FF3B30;
    --radius: 28px;
    --radius-sm: 14px;
    --pill: 99px;
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 48px rgba(0,0,0,0.10);
    --shadow-soft: 0 2px 12px rgba(0,0,0,0.04);
    --transition: 0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
    --nav-h: 64px;
    --maxw: 1180px;
}

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

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont,
                 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }

/* ============================================================
   通用排版
   ============================================================ */
.eyebrow {
    display: inline-block;
    font-size: 13px; font-weight: 600; letter-spacing: 0.6px;
    color: var(--accent); text-transform: uppercase;
    margin-bottom: 12px;
}
.h-display {
    font-size: 52px; font-weight: 700; letter-spacing: -1.5px;
    line-height: 1.08;
}
.h-section {
    font-size: 32px; font-weight: 700; letter-spacing: -0.8px;
    line-height: 1.15;
}
.sub-section { color: var(--text-secondary); font-size: 17px; line-height: 1.6; }

/* 按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    border: none; cursor: pointer; font-weight: 600; font-size: 15px;
    border-radius: var(--pill); padding: 13px 26px;
    transition: var(--transition); letter-spacing: -0.1px; font-family: inherit;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 8px 24px rgba(0,113,227,0.25); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }

.btn-ghost { background: var(--accent-soft); color: var(--accent); }
.btn-ghost:hover { background: rgba(0,113,227,0.14); }

.btn-light { background: rgba(255,255,255,0.16); color: #fff; backdrop-filter: blur(8px); }
.btn-light:hover { background: rgba(255,255,255,0.28); }

.btn-secondary {
    background: #fff; color: var(--text); border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm); padding: 12px 20px; font-weight: 600;
    font-size: 15px; cursor: pointer; transition: var(--transition); font-family: inherit;
}
.btn-secondary:hover { background: var(--bg); }

/* ============================================================
   玻璃态导航
   ============================================================ */
.glass {
    background: rgba(255,255,255,0.72);
    backdrop-filter: blur(32px);
    -webkit-backdrop-filter: blur(32px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
}
.topnav {
    position: sticky; top: 0; z-index: 100;
    height: var(--nav-h);
    display: flex; align-items: center;
}
.nav-inner {
    width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; letter-spacing: -0.3px; }
.nav-logo .logo-mark {
    width: 32px; height: 32px; border-radius: 9px;
    background: linear-gradient(135deg, #0071E3, #5AC8FA);
    display: flex; align-items: center; justify-content: center; color: #fff;
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
    padding: 8px 14px; border-radius: var(--pill); font-size: 14px; font-weight: 500;
    color: var(--text-secondary); transition: var(--transition);
}
.nav-links a:hover { background: var(--bg); color: var(--text); }
.nav-cta { display: flex; align-items: center; gap: 10px; }

/* ============================================================
   首页 / 通用区块
   ============================================================ */
.home { padding-bottom: 64px; }
.section { max-width: var(--maxw); margin: 0 auto; padding: 72px 24px; }
.section-head { max-width: 640px; margin-bottom: 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* Hero */
.hero {
    position: relative; overflow: hidden;
    background:
        radial-gradient(900px 480px at 78% -10%, rgba(0,113,227,0.12), transparent 60%),
        radial-gradient(700px 420px at 10% 0%, rgba(90,200,250,0.10), transparent 55%),
        var(--bg);
}
.hero-inner {
    max-width: var(--maxw); margin: 0 auto; padding: 80px 24px 88px;
    display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center;
}
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: #fff; border: 1px solid var(--border);
    border-radius: var(--pill); padding: 7px 16px; font-size: 13px; font-weight: 500;
    color: var(--text-secondary); box-shadow: var(--shadow-soft); margin-bottom: 22px;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.hero-sub { color: var(--text-secondary); font-size: 19px; line-height: 1.6; margin: 20px 0 32px; max-width: 30em; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual {
    background: #0A0A0B; border-radius: var(--radius);
    aspect-ratio: 16 / 11; position: relative; overflow: hidden;
    box-shadow: var(--shadow-lg);
    display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.5);
}
.hero-visual::after {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(600px 300px at 50% 120%, rgba(0,113,227,0.35), transparent 60%);
}
.hero-visual .play {
    width: 72px; height: 72px; border-radius: 50%; background: rgba(255,255,255,0.92);
    display: flex; align-items: center; justify-content: center; color: #0A0A0B; z-index: 1;
    box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

/* 特性卡片（5 个动作） */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.feature-card {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 26px 22px; text-align: center;
    box-shadow: var(--shadow-soft); transition: var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.feature-emoji {
    width: 60px; height: 60px; margin: 0 auto 16px; border-radius: 18px;
    background: var(--accent-soft); color: var(--accent);
    display: flex; align-items: center; justify-content: center; font-size: 30px;
}
.feature-card h3 { font-size: 17px; font-weight: 600; letter-spacing: -0.2px; }
.feature-card p { color: var(--text-secondary); font-size: 13px; margin-top: 6px; }

/* 三步引导 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-soft);
}
.step-no {
    width: 40px; height: 40px; border-radius: 12px; margin-bottom: 16px;
    background: var(--accent); color: #fff; display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 18px;
}
.step h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.step p { color: var(--text-secondary); font-size: 14px; line-height: 1.6; }

/* 深色分析展示 Bento */
.bento {
    background: #0A0A0B; border-radius: var(--radius);
    padding: 8px; display: grid; grid-template-columns: 1.4fr 1fr; gap: 8px;
}
.bento-card { background: #161618; border-radius: 20px; padding: 28px; color: #fff; }
.bento-card .bento-tag { font-size: 13px; color: rgba(255,255,255,0.55); margin-bottom: 10px; }
.bento-card .bento-num { font-size: 40px; font-weight: 700; letter-spacing: -1px; }
.bento-card .bento-num.accent { color: #5AC8FA; }
.bento-card .bento-num.green { color: #34C759; }
.bento-card p { color: rgba(255,255,255,0.6); font-size: 14px; margin-top: 8px; }

/* 角色重定向卡片 */
.role-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.role-card {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow-soft);
    transition: var(--transition); display: block;
}
.role-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.role-card .role-emoji { font-size: 30px; margin-bottom: 12px; }
.role-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 6px; }
.role-card p { color: var(--text-secondary); font-size: 13px; line-height: 1.55; }
.role-card .role-go {
    margin-top: 16px; font-size: 14px; font-weight: 600; color: var(--accent);
    display: inline-flex; align-items: center; gap: 6px;
}

/* ============================================================
   统计卡片（工作台 / 控制台 / 教师页）
   ============================================================ */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.stat-card {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 22px 24px; box-shadow: var(--shadow-soft);
}
.stat-card .stat-label { font-size: 14px; color: var(--text-secondary); font-weight: 500; }
.stat-card .stat-value { font-size: 34px; font-weight: 700; letter-spacing: -1px; margin-top: 8px; }
.stat-card .stat-value.accent { color: var(--accent); }
.stat-card .stat-value.purple { color: var(--accent-purple); }
.stat-card .stat-value.green { color: var(--accent-green); }
.stat-card .stat-hint { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

/* ============================================================
   卡片 / 工作区布局
   ============================================================ */
.card {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px; margin-bottom: 18px;
    box-shadow: var(--shadow-soft); transition: var(--transition);
}
.card-title { font-size: 19px; font-weight: 600; margin-bottom: 18px; letter-spacing: -0.2px; }

/* 工作台：侧边栏 + 主区 */
.workbench { display: grid; grid-template-columns: 240px 1fr; gap: 28px; max-width: var(--maxw); margin: 0 auto; padding: 28px 24px 64px; align-items: start; }
.sidebar {
    position: sticky; top: calc(var(--nav-h) + 20px);
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow-soft);
}
.sidebar .side-title { font-size: 12px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; padding: 8px 12px; }
.side-item {
    display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: var(--radius-sm);
    color: var(--text-secondary); font-size: 15px; font-weight: 500; cursor: pointer; transition: var(--transition);
}
.side-item:hover { background: var(--bg); color: var(--text); }
.side-item.active { background: var(--accent-soft); color: var(--accent); }
.side-item .si-ico { width: 20px; text-align: center; }
.wb-main { min-width: 0; }

.page-head { margin-bottom: 22px; }
.page-head h1 { font-size: 28px; font-weight: 700; letter-spacing: -0.6px; }
.page-head p { color: var(--text-secondary); font-size: 15px; margin-top: 4px; }

/* ============================================================
   上传 / 文件 / 动作 / 进度 / 结果（保留原 class 名）
   ============================================================ */
.upload-area {
    border: 2px dashed var(--border-strong); border-radius: var(--radius-sm);
    padding: 48px 24px; text-align: center; cursor: pointer; transition: var(--transition);
    background: #fff;
}
.upload-area:hover, .upload-area.drag-over { border-color: var(--accent); background: var(--accent-soft); }
.upload-icon { color: var(--accent); margin-bottom: 14px; }
.upload-text { font-size: 17px; font-weight: 500; }
.upload-text .link { color: var(--accent); cursor: pointer; }
.upload-hint { color: var(--text-secondary); font-size: 13px; margin-top: 8px; }

.file-info { margin-top: 18px; }
.file-preview video { width: 100%; max-height: 340px; border-radius: var(--radius-sm); background: #000; }
.file-meta { display: flex; justify-content: space-between; margin-top: 10px; font-size: 14px; color: var(--text-secondary); }

.action-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.action-btn {
    background: var(--bg); border: 2px solid transparent; border-radius: var(--radius-sm);
    padding: 18px 12px; cursor: pointer; text-align: center; transition: var(--transition);
    display: flex; flex-direction: column; align-items: center; gap: 8px; font-family: inherit;
}
.action-btn:hover { border-color: var(--accent); background: var(--accent-soft); }
.action-btn.selected { border-color: var(--accent); background: var(--accent-soft); box-shadow: 0 0 0 3px rgba(0,113,227,0.12); }
.action-emoji { font-size: 28px; }
.action-label { font-size: 15px; font-weight: 600; color: var(--text); }
.action-desc { font-size: 12px; color: var(--text-secondary); }

/* 进度 */
.progress-bar-wrapper { background: #E5E5EA; border-radius: var(--pill); height: 10px; overflow: hidden; }
.progress-bar { height: 100%; background: linear-gradient(90deg, #0071E3, #5AC8FA); border-radius: var(--pill); width: 0%; transition: width 0.4s ease; }
.progress-text { margin-top: 12px; font-size: 14px; color: var(--text-secondary); }
.progress-pct { font-size: 30px; font-weight: 700; color: var(--accent); margin-top: 4px; letter-spacing: -1px; }

/* 结果 */
.result-overall { text-align: center; margin-bottom: 24px; }
.score-circle {
    width: 104px; height: 104px; border-radius: 50%; margin: 0 auto 12px;
    display: flex; align-items: center; justify-content: center; font-size: 38px; font-weight: 700; color: #fff;
}
.score-circle.excellent { background: var(--green); }
.score-circle.good { background: var(--accent); }
.score-circle.fair { background: var(--orange); }
.score-circle.poor { background: var(--red); }
.result-score-label { font-size: 14px; color: var(--text-secondary); }
.result-meta { font-size: 13px; color: var(--text-secondary); margin-top: 6px; }

.scores-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 24px; }
.score-item { background: var(--bg); border-radius: var(--radius-sm); padding: 16px; text-align: center; }
.score-item-label { font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }
.score-item-value { font-size: 24px; font-weight: 700; color: var(--text); }
.score-item-level { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }

.action-result { margin-bottom: 24px; }
.action-result h3 { font-size: 17px; font-weight: 600; margin-bottom: 12px; }
.pass-badge { display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; border-radius: var(--pill); font-size: 14px; font-weight: 600; }
.pass-badge.pass { background: var(--accent-green-soft); color: var(--accent-green); }
.pass-badge.fail { background: rgba(255,59,48,0.12); color: var(--red); }

.detail-list { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.detail-item { display: flex; align-items: center; gap: 12px; padding: 12px 14px; background: var(--bg); border-radius: var(--radius-sm); }
.detail-status { width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; flex-shrink: 0; }
.detail-status.ok { background: rgba(52,199,89,0.2); color: var(--green); }
.detail-status.warn { background: rgba(255,149,0,0.2); color: var(--orange); }
.detail-status.error, .detail-status.fail { background: rgba(255,59,48,0.2); color: var(--red); }
.detail-info { flex: 1; }
.detail-label { font-size: 14px; font-weight: 500; }
.detail-metrics { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }
.detail-advice { font-size: 12px; margin-top: 4px; line-height: 1.4; }
.detail-advice.ok { color: var(--green); }
.detail-advice.warn { color: var(--orange); }
.detail-advice.error, .detail-advice.fail { color: var(--red); }

.joint-range { margin-top: 16px; padding: 16px; background: var(--bg); border-radius: var(--radius-sm); }
.joint-range h4 { font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.joint-range-row { display: flex; justify-content: space-between; font-size: 13px; color: var(--text-secondary); padding: 4px 0; }

.charts-section { margin-bottom: 24px; }
.charts-section h4 { font-size: 17px; font-weight: 600; margin-bottom: 12px; }
.charts-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.chart-img { width: 100%; border-radius: var(--radius-sm); background: var(--bg); border: 1px solid var(--border); }

.ai-report-box {
    background: linear-gradient(135deg, rgba(0,113,227,0.07), rgba(90,200,250,0.07));
    border: 1px solid rgba(0,113,227,0.18); border-radius: var(--radius-sm); padding: 20px; margin-bottom: 24px;
}
.ai-report-box h4 { font-size: 17px; font-weight: 600; margin-bottom: 10px; color: var(--accent); display: flex; align-items: center; gap: 6px; }
.ai-report-text { font-size: 14px; line-height: 1.7; color: var(--text); white-space: pre-wrap; }

.overlay-video { width: 100%; max-height: 380px; border-radius: var(--radius-sm); background: #000; margin-bottom: 12px; }
.video-download { text-align: center; margin-top: 20px; }
.btn-download {
    display: inline-flex; align-items: center; gap: 8px; background: var(--accent); color: #fff;
    border: none; border-radius: var(--pill); padding: 13px 28px; font-size: 15px; font-weight: 600;
    cursor: pointer; text-decoration: none; transition: var(--transition); font-family: inherit;
}
.btn-download:hover { background: var(--accent-hover); transform: translateY(-1px); }

.error-box {
    background: rgba(255,59,48,0.08); border: 1px solid rgba(255,59,48,0.3);
    border-radius: var(--radius-sm); padding: 16px; color: var(--red); font-size: 14px; text-align: center;
}

/* ============================================================
   用户条 / 鉴权 / 弹窗
   ============================================================ */
.user-bar { display: flex; align-items: center; gap: 12px; font-size: 14px; color: var(--text-secondary); }
.user-bar .quota-badge {
    background: linear-gradient(135deg, #0071E3, #5AC8FA); color: #fff;
    padding: 5px 14px; border-radius: var(--pill); font-weight: 600; font-size: 13px;
}
.user-bar .quota-badge.low { background: linear-gradient(135deg, #FF9500, #FF3B30); }
.user-bar .quota-badge.empty { background: linear-gradient(135deg, #FF3B30, #C00); }
.user-bar .logout-btn {
    background: none; border: 1px solid var(--border-strong); padding: 6px 14px;
    border-radius: var(--pill); cursor: pointer; color: var(--text-secondary); font-size: 13px;
    transition: var(--transition); font-family: inherit;
}
.user-bar .logout-btn:hover { background: var(--bg); color: var(--text); }

/* 鉴权（登录/注册）分栏布局 */
.auth-wrap { max-width: 960px; margin: 40px auto; display: grid; grid-template-columns: 1fr 1fr; min-height: 560px; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); background: #fff; }
.auth-brand {
    background:
        radial-gradient(600px 360px at 20% 0%, rgba(90,200,250,0.28), transparent 60%),
        linear-gradient(160deg, #0071E3, #0A0A0B);
    color: #fff; padding: 48px; display: flex; flex-direction: column; justify-content: space-between;
}
.auth-brand .brand-logo { display: flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 700; }
.auth-brand .brand-logo .logo-mark { width: 40px; height: 40px; border-radius: 11px; background: rgba(255,255,255,0.18); display: flex; align-items: center; justify-content: center; }
.auth-brand h2 { font-size: 34px; font-weight: 700; letter-spacing: -0.8px; line-height: 1.2; margin-bottom: 14px; }
.auth-brand p { color: rgba(255,255,255,0.72); font-size: 15px; line-height: 1.7; }
.auth-brand .brand-points { display: flex; flex-direction: column; gap: 14px; margin-top: 28px; }
.auth-brand .brand-point { display: flex; align-items: center; gap: 12px; font-size: 14px; color: rgba(255,255,255,0.85); }
.auth-brand .brand-point .bp-ico { width: 30px; height: 30px; border-radius: 9px; background: rgba(255,255,255,0.14); display: flex; align-items: center; justify-content: center; }
.auth-panel { padding: 48px; display: flex; flex-direction: column; justify-content: center; }
.auth-panel .panel-title { font-size: 24px; font-weight: 700; letter-spacing: -0.5px; margin-bottom: 6px; }
.auth-panel .panel-sub { color: var(--text-secondary); font-size: 14px; margin-bottom: 24px; }

.auth-tabs { display: flex; gap: 4px; margin-bottom: 24px; background: var(--bg); padding: 4px; border-radius: var(--pill); }
.auth-tab {
    flex: 1; padding: 10px; background: none; border: none; border-radius: var(--pill);
    cursor: pointer; font-size: 15px; font-weight: 500; color: var(--text-secondary);
    transition: var(--transition); font-family: inherit;
}
.auth-tab.active { background: #fff; color: var(--accent); box-shadow: 0 1px 4px rgba(0,0,0,0.08); }
.auth-form .form-row { margin-bottom: 16px; }
.auth-form label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--text); font-weight: 500; }
.auth-form input {
    width: 100%; padding: 13px 15px; border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm); font-size: 15px; box-sizing: border-box; transition: var(--transition); font-family: inherit;
}
.auth-form input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0,113,227,0.12); }
.register-tip { background: var(--accent-soft); color: var(--accent); padding: 11px 14px; border-radius: var(--radius-sm); font-size: 13px; margin: 12px 0; }
.auth-error { color: var(--red); font-size: 13px; min-height: 18px; margin-bottom: 8px; }

.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 1000; padding: 20px; }
.modal-box { background: #fff; border-radius: var(--radius); max-width: 440px; width: 100%; padding: 32px; box-shadow: var(--shadow-lg); text-align: center; }
.modal-box h3 { margin: 0 0 12px; font-size: 20px; }
.modal-box p { color: var(--text-secondary); margin: 0 0 20px; font-size: 14px; line-height: 1.6; }
.modal-box .modal-actions { display: flex; gap: 12px; }
.modal-box .modal-actions .btn, .modal-box .modal-actions .btn-secondary { flex: 1; }

/* ============================================================
   管理后台 / 角色标签
   ============================================================ */
.admin-toolbar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.admin-toolbar input[type="text"], .admin-toolbar input[type="number"] {
    padding: 11px 14px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
    font-size: 14px; flex: 1; min-width: 180px; font-family: inherit;
}
.admin-toolbar select { padding: 11px 14px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); font-size: 14px; background: #fff; font-family: inherit; }

.admin-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.admin-table th, .admin-table td { padding: 13px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.admin-table th { background: var(--bg); font-weight: 600; color: var(--text-secondary); font-size: 13px; }
.admin-table tbody tr:hover { background: rgba(0,0,0,0.015); }
.admin-table .actions-cell { display: flex; gap: 8px; flex-wrap: wrap; }
.admin-table .action-link { background: none; border: none; color: var(--accent); cursor: pointer; font-size: 13px; padding: 4px 8px; border-radius: 6px; transition: var(--transition); font-family: inherit; }
.admin-table .action-link:hover { background: var(--accent-soft); }
.admin-table .action-link.danger { color: var(--red); }
.admin-table .action-link.danger:hover { background: rgba(255,59,48,0.1); }

.role-tag { display: inline-block; padding: 3px 10px; border-radius: var(--pill); font-size: 12px; font-weight: 500; }
.role-tag.member { background: var(--accent-soft); color: var(--accent); }
.role-tag.admin { background: var(--accent-purple-soft); color: var(--accent-purple); }
.role-tag.teacher { background: var(--accent-green-soft); color: var(--accent-green); }
.role-tag.student, .role-tag.parent { background: var(--bg); color: var(--text-secondary); }

/* ============================================================
   充值页
   ============================================================ */
.recharge-qr { width: 240px; height: 240px; object-fit: contain; border-radius: var(--radius-sm); border: 1px solid var(--border); display: block; margin: 16px auto; background: #fff; }
.recharge-info { background: var(--bg); padding: 18px; border-radius: var(--radius-sm); margin: 16px 0; font-size: 14px; line-height: 1.8; }
.recharge-info .order-id { font-family: monospace; font-weight: 600; color: var(--accent); user-select: all; cursor: pointer; }
.recharge-info .email-link { color: var(--accent); text-decoration: none; }
.copy-btn { background: var(--accent); color: #fff; border: none; padding: 4px 10px; border-radius: 6px; font-size: 12px; cursor: pointer; margin-left: 8px; font-family: inherit; }
.copy-btn:hover { background: var(--accent-hover); }

/* ============================================================
   教师班级报表页
   ============================================================ */
.teacher-layout { max-width: var(--maxw); margin: 0 auto; padding: 28px 24px 64px; }
.trend-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-soft); margin-bottom: 18px; }
.trend-card h3 { font-size: 19px; font-weight: 600; margin-bottom: 4px; }
.trend-card .trend-sub { color: var(--text-secondary); font-size: 14px; margin-bottom: 18px; }
.trend-svg { width: 100%; height: 240px; display: block; }

.student-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.student-table th, .student-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--border); }
.student-table th { background: var(--bg); font-weight: 600; color: var(--text-secondary); font-size: 13px; }
.student-table .stu-score { font-weight: 700; font-size: 16px; }
.student-table .trend-up { color: var(--green); font-weight: 600; }
.student-table .trend-down { color: var(--red); font-weight: 600; }
.student-table .trend-flat { color: var(--text-secondary); font-weight: 600; }
.score-pill { display: inline-flex; align-items: center; justify-content: center; min-width: 34px; height: 28px; padding: 0 8px; border-radius: var(--pill); font-weight: 700; font-size: 14px; }
.score-pill.g { background: rgba(52,199,89,0.15); color: var(--green); }
.score-pill.b { background: var(--accent-soft); color: var(--accent); }
.score-pill.o { background: rgba(255,149,0,0.15); color: var(--orange); }
.score-pill.r { background: rgba(255,59,48,0.15); color: var(--red); }

/* ============================================================
   页脚
   ============================================================ */
.footer { text-align: center; padding: 32px 24px; color: var(--text-secondary); font-size: 13px; border-top: 1px solid var(--border); }

/* 居中窄容器（充值页等沿用） */
.app { max-width: 680px; margin: 0 auto; padding: 40px 20px 60px; }
.header { text-align: center; padding: 12px 0 28px; }
.header h1 { font-size: 28px; font-weight: 700; letter-spacing: -0.6px; }
.header-sub { color: var(--text-secondary); font-size: 15px; margin-top: 4px; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero-visual { aspect-ratio: 16 / 9; }
    .feature-grid { grid-template-columns: repeat(3, 1fr); }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .role-grid { grid-template-columns: repeat(2, 1fr); }
    .workbench { grid-template-columns: 1fr; }
    .sidebar { position: static; display: flex; gap: 8px; overflow-x: auto; }
    .sidebar .side-title { display: none; }
    .action-list { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 720px) {
    .h-display { font-size: 38px; }
    .h-section { font-size: 26px; }
    .section { padding: 48px 18px; }
    .feature-grid, .steps, .role-grid, .charts-grid, .scores-grid { grid-template-columns: 1fr; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .auth-wrap { grid-template-columns: 1fr; margin: 16px; }
    .auth-brand { display: none; }
    .auth-panel { padding: 32px 24px; }
    .action-list { grid-template-columns: repeat(2, 1fr); }
    .nav-links { display: none; }
    .card { padding: 20px; }
}

/* ============================================================
   数据报表页样式（reports.html）
   ============================================================ */

.reports-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-box {
    background: var(--bg);
    border-radius: var(--radius-sm);
    padding: 20px 16px;
    text-align: center;
}

.stat-box-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
    margin-bottom: 4px;
}

.stat-box-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.reports-subtitle {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin: 24px 0 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.reports-empty {
    text-align: center;
    color: var(--text-tertiary);
    padding: 48px 24px;
    font-size: 14px;
}

/* 班级报表头部 */
.class-report-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.class-report-header h3 {
    margin: 0;
    font-size: 20px;
    color: var(--text);
}

/* 月度趋势 */
.reports-trend-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.reports-trend-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.reports-trend-row .trend-month {
    font-size: 13px;
    color: var(--text-secondary);
    width: 80px;
    flex-shrink: 0;
}

.reports-trend-row .trend-bar-wrap {
    flex: 1;
    height: 12px;
    background: var(--bg);
    border-radius: 100px;
    overflow: hidden;
}

.reports-trend-row .trend-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--green), #4ade80);
    border-radius: 100px;
    transition: width 0.5s;
}

.reports-trend-row .trend-info {
    font-size: 12px;
    color: var(--text-secondary);
    flex-shrink: 0;
    min-width: 120px;
    text-align: right;
}

/* 常见错误 */
.reports-error-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.reports-error-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    background: var(--bg);
    border-radius: var(--radius-sm);
}

.reports-error-row .error-name {
    font-size: 14px;
    color: var(--text);
}

.reports-error-row .error-count {
    font-size: 13px;
    color: var(--orange);
    font-weight: 600;
}

/* 动作分布 */
.reports-action-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.reports-action-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.reports-action-row .action-meta {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ============================================================
   个人中心 · 进步曲线柱状图
   ============================================================ */
.progress-chart {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 180px;
    padding: 16px 8px;
    overflow-x: auto;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
}

.progress-bar-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    flex: 1;
    min-width: 28px;
    height: 100%;
    position: relative;
}

.progress-bar-fill {
    width: 100%;
    max-width: 32px;
    border-radius: 4px 4px 0 0;
    min-height: 4px;
    transition: height 0.5s;
}

.progress-bar-score {
    font-size: 10px;
    color: var(--text-secondary);
    margin-top: 4px;
    white-space: nowrap;
}

/* ============================================================
   充值页 · 联系管理员引导框
   ============================================================ */
.recharge-contact-box {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 32px 24px;
    margin-top: 8px;
}

.contact-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.contact-email {
    font-size: 22px;
    font-weight: 700;
    color: var(--accent);
    user-select: all;
    cursor: pointer;
    word-break: break-all;
}

/* ============================================================
   ICP 备案号链接（footer 底部，工信部要求）
   ============================================================ */
.beian-link {
    color: var(--text-tertiary);
    font-size: 12px;
    text-decoration: none;
    transition: color 0.2s;
}

.beian-link:hover {
    color: var(--text-secondary);
    text-decoration: underline;
}