:root {
    --demo-primary: #16baaa;
    --demo-primary-dark: #0f8f83;
    --demo-ink: #192b3c;
    --demo-muted: #728197;
    --demo-line: #e7edf3;
    --demo-bg: #f4f7fb;
    --demo-panel: #ffffff;
    --demo-warm: #fff7e6;
    --demo-blue: #eff6ff;
    --demo-purple: #f6f1ff;
    --demo-danger: #ff6b6b;
}

html, body { min-height: 100%; }
body {
    background: var(--demo-bg);
    color: var(--demo-ink);
    font-family: "Microsoft YaHei", "PingFang SC", Helvetica, Arial, sans-serif;
}
a { color: inherit; }
.demo-page { min-height: 100vh; }
.demo-container { width: min(1440px, calc(100% - 40px)); margin: 0 auto; }
.demo-topbar {
    height: 64px;
    background: #fff;
    border-bottom: 1px solid var(--demo-line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 0 28px;
}
.site-brand { display: flex; align-items: baseline; gap: 10px; text-decoration: none; color: #1E1B2E; }
.site-brand:hover { text-decoration: none; }
.site-brand__cn {
    font-size: 22px; font-weight: 800; letter-spacing: 0.02em;
    background: linear-gradient(135deg, #4F46E5 0%, #EC4899 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.site-brand__en { font-size: 12px; color: #5C5776; letter-spacing: 0.01em; }
.demo-topbar-brand { display: flex; align-items: baseline; gap: 18px; min-width: 0; }
.quick-quiz-module-brand { color: var(--demo-primary-dark); font-size: 16px; font-weight: 700; text-decoration: none; white-space: nowrap; }
.quick-quiz-module-brand:hover { color: var(--demo-primary); text-decoration: none; }
.demo-user { color: var(--demo-muted); font-size: 13px; }
.demo-main { padding: 28px 0 46px; }
.demo-card { background: var(--demo-panel); border: 1px solid var(--demo-line); border-radius: 16px; box-shadow: 0 12px 30px rgba(33, 54, 74, .05); }
.demo-card-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 20px 22px; border-bottom: 1px solid var(--demo-line); }
.demo-card-header h2, .demo-card-header h3 { margin: 0; font-weight: 700; }
.demo-card-body { padding: 22px; }
.demo-eyebrow { margin-bottom: 8px; color: var(--demo-primary-dark); font-size: 12px; font-weight: 700; letter-spacing: 1.8px; }
.demo-title { margin: 0; color: var(--demo-ink); font-size: clamp(26px, 4vw, 44px); font-weight: 800; line-height: 1.2; }
.demo-subtitle { margin: 14px 0 0; color: var(--demo-muted); line-height: 1.8; }
.demo-muted { color: var(--demo-muted); }
.demo-flex { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.demo-between { justify-content: space-between; }
.demo-gap-lg { gap: 18px; }
.demo-section-gap { margin-top: 22px; }
.demo-number { color: var(--demo-primary-dark); font-size: 30px; font-weight: 800; }
.demo-kicker { color: var(--demo-muted); font-size: 12px; }
.demo-hero { padding: 0 0 38px; background: radial-gradient(circle at 15% 10%, rgba(22,186,170,.15), transparent 32%), linear-gradient(135deg, #ecfffb, #f4f7ff 52%, #fff8ee); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(360px, .85fr); align-items: center; gap: 48px; }
.hero-badges { display: flex; gap: 9px; flex-wrap: wrap; margin-top: 24px; }
.hero-badge { padding: 7px 11px; border-radius: 999px; color: var(--demo-primary-dark); background: rgba(22,186,170,.11); font-size: 12px; font-weight: 700; }
.login-card { padding: 28px; border-radius: 20px; background: rgba(255,255,255,.95); box-shadow: 0 22px 55px rgba(39, 75, 93, .12); }
.login-card h2 { margin: 0 0 7px; font-size: 24px; }
.login-card .layui-form-item { margin-bottom: 18px; }
.login-hint { padding: 11px 13px; color: #68778d; background: #f7fafc; border-radius: 9px; font-size: 12px; line-height: 1.7; }
.quick-entry { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 15px; }
.entry-card { display: block; padding: 17px; border: 1px solid var(--demo-line); border-radius: 12px; background: #fff; transition: .2s; }
.entry-card:hover { border-color: var(--demo-primary); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(22,186,170,.1); }
.entry-card strong { display: block; margin-bottom: 4px; }
.entry-card span { color: var(--demo-muted); font-size: 12px; }
.role-select-card { max-width: 860px; padding: 42px; margin: 30px auto 0; border: 1px solid var(--demo-line); border-radius: 20px; background: #fff; box-shadow: 0 18px 42px rgba(33, 54, 74, .07); text-align: center; }
.role-select-card h1 { margin: 0 0 8px; font-size: 30px; }
.role-select-card > p { margin-top: 8px; }
.role-choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 28px; text-align: left; }
.role-choice { display: block; padding: 24px; border: 1px solid var(--demo-line); border-radius: 15px; color: var(--demo-ink); background: #fbfcfe; transition: .2s; }
.role-choice:hover { border-color: var(--demo-primary); background: #effbf9; box-shadow: 0 10px 24px rgba(22,186,170,.1); transform: translateY(-2px); }
.role-choice-icon { display: grid; place-items: center; width: 42px; height: 42px; margin-bottom: 16px; border-radius: 12px; color: #fff; background: linear-gradient(135deg, #16baaa, #4e8cff); font-size: 22px; }
.role-choice strong { display: block; font-size: 19px; }
.role-choice > span:not(.role-choice-icon) { display: block; min-height: 44px; margin-top: 8px; color: var(--demo-muted); font-size: 13px; line-height: 1.8; }
.role-choice em { display: block; margin-top: 18px; color: var(--demo-primary-dark); font-size: 12px; font-style: normal; font-weight: 700; }
.demo-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 22px; }
.demo-toolbar h1 { margin: 0; font-size: 25px; font-weight: 800; }
.demo-toolbar p { margin: 5px 0 0; color: var(--demo-muted); }
.host-grid { display: grid; grid-template-columns: 245px minmax(0, 1fr) 335px; gap: 18px; align-items: start; }
.host-grid--two { grid-template-columns: 245px minmax(0, 1fr); }
.activity-list { padding: 10px; }
.activity-item { display: block; width: 100%; padding: 15px; margin-bottom: 8px; border: 1px solid transparent; border-radius: 11px; background: transparent; text-align: left; cursor: pointer; }
.activity-item:hover, .activity-item.is-active { border-color: #bfece5; background: #effbf9; }
.activity-item strong { display: block; margin-bottom: 5px; font-size: 14px; }
.activity-item small { display: block; color: var(--demo-muted); line-height: 1.6; }
.activity-item .layui-badge { margin-top: 9px; }
.question-summary { padding: 15px; margin-bottom: 18px; border-radius: 11px; background: #f7fafc; }
.question-summary h3 { margin: 0 0 8px; font-size: 18px; }
.host-question-switcher { padding: 15px; margin-bottom: 18px; border: 1px solid var(--demo-line); border-radius: 11px; background: #fbfcfe; }
.host-question-switcher h3 { margin: 0 0 4px; font-size: 15px; }
.host-question-nav { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin-top: 13px; }
.host-question-nav-item { display: flex; align-items: center; gap: 7px; min-width: 0; padding: 9px 10px; border: 1px solid transparent; border-radius: 8px; background: #fff; color: var(--demo-ink); text-align: left; cursor: pointer; }
.host-question-nav-item:hover, .host-question-nav-item.is-active { border-color: #bfece5; background: #effbf9; }
.host-question-nav-item strong { color: var(--demo-primary-dark); font-size: 12px; }
.host-question-nav-item span { overflow: hidden; color: var(--demo-muted); font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.question-editor .layui-form-label { width: 78px; padding-left: 0; }
.question-editor .layui-input-block { margin-left: 108px; }
.option-row { display: flex; align-items: center; gap: 8px; margin: 8px 0; }
.option-row .layui-input { flex: 1; }
.round-highlight { padding: 18px; border-radius: 13px; color: #fff; background: linear-gradient(135deg, #1b9c91, #477be9); }
.round-highlight .round-code { display: inline-block; margin-top: 7px; padding: 6px 11px; border-radius: 7px; background: rgba(255,255,255,.17); font-size: 20px; font-weight: 800; letter-spacing: 3px; }
.round-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 15px; }
.mini-stat { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 14px; }
.mini-stat > div { padding: 10px; border-radius: 10px; background: rgba(255,255,255,.12); }
.mini-stat strong, .mini-stat span { display: block; }
.mini-stat span { margin-top: 3px; opacity: .78; font-size: 11px; }
.round-list { margin-top: 17px; }
.round-list h3 { margin: 0 0 10px; font-size: 15px; }
.round-item { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 12px 0; border-bottom: 1px solid var(--demo-line); }
.round-item:last-child { border-bottom: 0; }
.round-item strong { display: block; margin-bottom: 3px; }
.round-item small { color: var(--demo-muted); }
.round-question-panel { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--demo-line); }
.round-question-panel h3 { margin: 0; font-size: 15px; }
.round-question-panel .demo-kicker { margin-top: 4px; }
.round-question-layout { display: grid; grid-template-columns: 1fr; gap: 12px; margin-top: 12px; }
.round-question-list { max-height: 244px; overflow-y: auto; padding-right: 3px; }
.round-question-item { display: grid; grid-template-columns: 28px minmax(0, 1fr) auto; align-items: center; gap: 7px; width: 100%; padding: 9px 8px; border: 1px solid transparent; border-radius: 9px; background: transparent; color: var(--demo-ink); text-align: left; cursor: pointer; }
.round-question-item:hover, .round-question-item.is-active { border-color: #bfece5; background: #effbf9; }
.round-question-item > span:first-child { color: var(--demo-muted); font-size: 12px; font-weight: 800; }
.round-question-item strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; }
.round-question-item em { color: var(--demo-muted); font-size: 10px; font-style: normal; white-space: nowrap; }
.round-question-item.is-published em { color: #087f5b; }
.question-detail { padding: 14px; border: 1px solid var(--demo-line); border-radius: 11px; background: #fbfcfe; }
.question-detail h4 { margin: 8px 0 10px; font-size: 14px; line-height: 1.5; }
.question-detail-options { padding: 0; margin: 0; }
.question-detail-options li { padding: 6px 9px; margin: 5px 0; border-radius: 7px; background: #fff; color: #587084; font-size: 12px; }
.question-detail-options li.is-answer { color: var(--demo-primary-dark); background: #eafff9; font-weight: 700; }
.question-detail-answer { padding: 9px 10px; margin-top: 10px; border-radius: 8px; color: #087f5b; background: #e7faf2; font-size: 12px; }
.question-detail-actions { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 12px; }
.question-publish-status { color: var(--demo-muted); font-size: 11px; }
.round-workspace { display: grid; grid-template-columns: 230px minmax(0, 1fr) 315px; gap: 18px; align-items: start; }
.round-page-context { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; padding: 20px 22px; margin-bottom: 20px; border: 1px solid #d9eee9; border-radius: 15px; background: linear-gradient(120deg, #effbf9, #f1f6ff); }
.round-page-context h1 { margin: 0; font-size: 28px; font-weight: 800; }
.round-page-context h1 span { color: var(--demo-muted); font-weight: 400; }
.round-page-context p { margin: 6px 0 0; color: var(--demo-muted); }
.round-live-current { padding: 13px; border-radius: 10px; color: #38566d; background: #f5f9fc; }
.round-live-current strong, .round-live-current span { display: block; }
.round-live-current span { margin-top: 4px; color: var(--demo-muted); font-size: 11px; }
.live-answered-title { margin: 20px 0 9px; font-weight: 700; }
.live-answer-wall { display: flex; flex-wrap: wrap; gap: 6px; }
.live-answer-wall .mahjong-tile { min-width: 68px; height: 30px; font-size: 11px; }
.round-selector { padding: 9px; }
.round-selector-item { display: block; width: 100%; padding: 14px; margin-bottom: 8px; border: 1px solid transparent; border-radius: 11px; background: transparent; text-align: left; cursor: pointer; }
.round-selector-item:hover, .round-selector-item.is-active { border-color: #bfece5; background: #effbf9; }
.round-selector-item strong, .round-selector-item small { display: block; }
.round-selector-item small { margin-top: 4px; color: var(--demo-muted); }
.round-control-card { padding: 22px; }
.round-control-card h2 { margin: 0 0 4px; font-size: 22px; }
.round-control-card .round-highlight { margin-top: 18px; }
.round-stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 18px; }
.round-stat { padding: 13px; border: 1px solid var(--demo-line); border-radius: 10px; background: #fbfcfe; }
.round-stat strong, .round-stat span { display: block; }
.round-stat strong { font-size: 20px; }
.round-stat span { margin-top: 4px; color: var(--demo-muted); font-size: 11px; }
.round-live-panel { padding: 0 20px 20px; }
.round-live-panel .leaderboard-list { padding: 0; }
.demo-tag { display: inline-flex; align-items: center; gap: 5px; padding: 4px 8px; border-radius: 999px; font-size: 11px; font-weight: 700; }
.demo-tag-green { color: #087f5b; background: #d9f8ed; }
.demo-tag-orange { color: #ad6500; background: #fff0cf; }
.demo-tag-gray { color: #627184; background: #eef2f6; }
.participant-layout { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 18px; align-items: start; }
.join-banner { padding: 18px 20px; border-radius: 14px; background: linear-gradient(120deg, #e9fffb, #eef4ff); }
.join-banner h2 { margin: 0 0 4px; font-size: 21px; }
.code-chip { padding: 6px 10px; border-radius: 8px; color: var(--demo-primary-dark); background: #d4f7f0; font-size: 18px; font-weight: 800; letter-spacing: 2px; }
.question-panel { margin-top: 18px; }
.question-type { color: var(--demo-primary-dark); font-size: 12px; font-weight: 700; }
.question-title { margin: 9px 0 20px; font-size: 25px; line-height: 1.5; }
.timer { display: grid; place-items: center; width: 92px; height: 92px; margin: 0 auto 20px; border: 8px solid #d8f5f0; border-top-color: var(--demo-primary); border-radius: 50%; color: var(--demo-primary-dark); font-size: 25px; font-weight: 800; }
.answer-choice { display: flex; align-items: center; gap: 10px; min-height: 50px; padding: 12px 14px; margin: 10px 0; border: 1px solid var(--demo-line); border-radius: 10px; cursor: pointer; }
.answer-choice:hover, .answer-choice.is-selected { border-color: var(--demo-primary); background: #effbf9; }
.answer-choice input { accent-color: var(--demo-primary); }
.submit-row { margin-top: 20px; text-align: center; }
.answer-state { padding: 13px; margin-top: 16px; border-radius: 10px; color: #547087; background: #f7fafc; text-align: center; }
.leaderboard-list { padding: 6px 20px 18px; }
.leaderboard-row { display: grid; grid-template-columns: 30px minmax(0, 1fr) 62px; gap: 8px; align-items: center; padding: 13px 0; border-bottom: 1px solid var(--demo-line); }
.leaderboard-row:last-child { border-bottom: 0; }
.rank { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 8px; color: #fff; background: #aab8c7; font-size: 12px; font-weight: 800; }
.rank.rank-1 { background: #f1b841; } .rank.rank-2 { background: #9daabd; } .rank.rank-3 { background: #c88962; }
.leaderboard-row strong { display: block; }
.leaderboard-row small { color: var(--demo-muted); }
.leaderboard-score { text-align: right; font-weight: 800; }
.wall-section { margin-top: 18px; }
.mahjong-wall { display: grid; grid-auto-flow: column; grid-template-rows: repeat(4, 46px); grid-auto-columns: minmax(98px, 1fr); gap: 8px; max-height: 208px; overflow: auto; padding: 4px; }
.mahjong-tile { display: flex; align-items: center; justify-content: center; min-width: 0; padding: 5px 8px; border: 1px solid #d4e0e8; border-bottom: 3px solid #a9bac6; border-radius: 7px; background: linear-gradient(145deg, #fff, #f3f8fb); color: #395267; font-size: 12px; font-weight: 700; }
.mahjong-tile.is-me { border-color: #74d6ca; border-bottom-color: var(--demo-primary); color: var(--demo-primary-dark); background: #eafff9; }
.notice-box { padding: 14px 16px; border-left: 4px solid var(--demo-primary); border-radius: 8px; color: #5a6f81; background: #f4fbfa; line-height: 1.7; }
.result-hero { padding: 28px; color: #fff; border-radius: 16px; background: linear-gradient(135deg, #173a5c, #1d8c85); }
.result-hero h1 { margin: 0 0 7px; font-size: 29px; }
.result-hero p { margin: 0; opacity: .8; }
.result-metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 18px; }
.result-metric { padding: 18px; border-radius: 12px; background: #fff; border: 1px solid var(--demo-line); }
.result-metric strong { display: block; margin-top: 6px; font-size: 25px; }
.result-grid { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 18px; margin-top: 18px; }
.score-table { width: 100%; }
.score-table th, .score-table td { padding: 13px 12px; border-bottom: 1px solid var(--demo-line); text-align: left; }
.score-table th { color: var(--demo-muted); font-size: 12px; font-weight: 400; }
.score-table td:last-child, .score-table th:last-child { text-align: right; }
.score-table tr.is-me td { color: var(--demo-primary-dark); background: #effbf9; font-weight: 700; }
.answer-review { padding: 16px 20px; border-bottom: 1px solid var(--demo-line); }
.answer-review:last-child { border-bottom: 0; }
.answer-review h4 { margin: 0 0 8px; font-weight: 700; }
.answer-review p { margin: 4px 0; color: var(--demo-muted); font-size: 13px; }
.answer-review .correct { color: #087f5b; font-weight: 700; }
.answer-review .wrong { color: #c94c4c; font-weight: 700; }
.empty-state { padding: 38px 20px; color: var(--demo-muted); text-align: center; }
.layui-btn-demo-primary { background: var(--demo-primary); }
.layui-btn-demo-primary:hover { background: var(--demo-primary-dark); }
.layui-btn-soft { color: var(--demo-primary-dark); border: 1px solid #bdebe4; background: #effbf9; }
.layui-btn-soft:hover { color: var(--demo-primary-dark); }
.layui-badge-demo { background: #ecf8f5; color: var(--demo-primary-dark); }
.demo-footer { padding: 22px 0 36px; color: var(--demo-muted); text-align: center; font-size: 12px; }

@media (max-width: 1180px) {
    .host-grid { grid-template-columns: 220px minmax(0, 1fr); }
    .host-grid > .demo-card:last-child { grid-column: 1 / -1; }
    .host-grid--two { grid-template-columns: 220px minmax(0, 1fr); }
    .round-workspace { grid-template-columns: 145px minmax(250px, 1fr) 175px; gap: 10px; }
    .round-workspace > .demo-card { min-width: 0; }
    .round-control-card { padding: 14px; }
    .round-question-panel { padding-left: 14px !important; padding-right: 14px !important; }
}
@media (max-width: 900px) {
    .hero-grid, .participant-layout, .result-grid { grid-template-columns: 1fr; }
    .result-metrics { grid-template-columns: repeat(2, 1fr); }
    .round-stat-grid { grid-template-columns: repeat(2, 1fr); }
    .round-page-context { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 680px) {
    .demo-container { width: min(100% - 24px, 560px); }
    .demo-topbar { height: auto; min-height: 60px; padding: 12px 16px; }
    .demo-user { display: none; }
    .demo-main { padding-top: 18px; }
    .demo-hero { padding: 0 0 24px; }
    .login-card { padding: 21px; }
    .quick-entry { grid-template-columns: 1fr; }
    .role-select-card { padding: 26px 20px; margin-top: 18px; }
    .role-choice-grid { grid-template-columns: 1fr; }
    .host-grid { grid-template-columns: 1fr; }
    .demo-toolbar { align-items: flex-start; flex-direction: column; }
    .question-title { font-size: 21px; }
    .host-question-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .result-metrics { grid-template-columns: 1fr 1fr; gap: 8px; }
    .result-metric { padding: 13px; }
    .result-metric strong { font-size: 21px; }
}