:root{color-scheme:light;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#152033;background:#f4f7fb;--ink: #152033;--muted: #64748b;--line: #dce5ef;--surface: #ffffff;--brand: #087f8c;--brand-dark: #075d68;--accent: #f2b705;--good: #21835b;--bad: #ba2d2d;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .4s ease;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);--shadow-md: 0 4px 12px rgba(15, 23, 42, .1);--shadow-lg: 0 14px 34px rgba(15, 23, 42, .08);--shadow-xl: 0 24px 60px rgba(7, 93, 104, .22)}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at top left,rgba(8,127,140,.12),transparent 34rem),linear-gradient(180deg,#f7fbff,#eef3f8);min-height:100vh}a{color:inherit;text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--brand)}button,.button,input,textarea,select{border-radius:8px;font:inherit;transition:all 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14px;border-radius:8px;transition:all var(--transition-fast)}nav a:hover{background:#087f8c1a;color:var(--brand)}nav a.active{background:var(--brand);color:#fff}.icon-button{min-height:36px;padding:8px}main{min-height:calc(100vh - 68px)}.home,.page,.live-layout{margin:0 auto;max-width:1180px;padding:42px 24px}.hero{align-items:center;background:linear-gradient(100deg,#0a2431e0,#117a8b9e),url(https://images.unsplash.com/photo-1509062522246-3755977927d7?auto=format&fit=crop&w=1600&q=80);background-position:center;background-size:cover;border-radius:16px;color:#fff;display:flex;min-height:500px;padding:56px;box-shadow:var(--shadow-xl);position:relative;overflow:hidden}.hero:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,rgba(8,127,140,.15) 0%,transparent 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h1{font-size:clamp(2rem,5vw,4rem)}.metric{color:#117a8b;font-size:1.2rem;font-weight:900}.participant-list{display:flex;flex-wrap:wrap;gap:8px}.participant-list span{background:#eef6f7;border-radius:8px;padding:8px 10px}.rank-row{align-items:center;border-top:1px solid #e1e8f0;display:flex;justify-content:space-between;padding:10px 0}.student-screen{align-items:center;display:flex;justify-content:center;min-height:calc(100vh - 68px);padding:22px;background:linear-gradient(180deg,#f7fbff,#eef3f8)}.student-card{max-width:760px;min-height:360px;width:100%;border-radius:16px}.student-card h1{font-size:clamp(2rem,10vw,4.2rem);line-height:1.2}.answer-grid{display:grid;gap:14px;grid-template-columns:repeat(2,minmax(0,1fr));margin-top:24px}.answer-grid button{border-left:8px solid var(--brand);font-size:1.15rem;justify-content:flex-start;min-height:84px;padding:18px;background:#fff;transition:all var(--transition-normal)}.answer-grid 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var(--brand)}.result-score{font-size:2rem;font-weight:900;color:var(--good);text-align:center;margin-top:24px}.slide-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.slide-counter{background:linear-gradient(135deg,#e0f7fa,#b2ebf2);color:var(--brand);padding:4px 12px;border-radius:20px;font-weight:700;font-size:.875rem}.slide-body{color:var(--muted);line-height:1.6;margin-bottom:16px}.participant-badge{background:linear-gradient(135deg,#e0f7fa,#b2ebf2);border-radius:20px;padding:6px 12px;font-weight:600;color:var(--brand-dark);display:inline-block;margin:4px}.participant-count{color:var(--muted);font-size:.875rem;margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}.rank-first{background:linear-gradient(135deg,#fef3c7,#fde68a);border-radius:8px;padding:8px 12px;margin:4px 0}.rank-position{font-weight:900;color:var(--brand);margin-right:8px}.rank-name{flex:1}.rank-score{color:var(--good);font-size:1.1rem}.note-form textarea{min-height:100px;resize:vertical}.note-form button{margin-top:12px;width:100%;justify-content:center}.empty-state{align-self:center;color:#617386;padding:48px 32px;text-align:center}.empty-state svg{width:64px;height:64px;color:#cbd5e1;margin-bottom:16px}.empty-state h3{font-size:1.25rem;margin:0 0 8px;color:#475569}.empty-state p{margin:0 0 20px;color:#94a3b8}.skeleton{background:linear-gradient(90deg,#e2e8f0 25%,#f1f5f9,#e2e8f0 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:8px}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-text{height:16px;margin-bottom:8px}.skeleton-title{height:28px;width:60%;margin-bottom:16px}.skeleton-card{height:160px}.skeleton-avatar{width:48px;height:48px;border-radius:50%}.page-enter{opacity:0;transform:translateY(20px)}.page-enter-active{opacity:1;transform:translateY(0);transition:all var(--transition-normal)}.card-lift{transition:all var(--transition-normal)}.card-lift:hover{transform:translateY(-6px);box-shadow:0 24px 48px #0f172a26}button:focus-visible,.button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid var(--brand);outline-offset:2px}html{scroll-behavior:smooth}::selection{background:#087f8c4d;color:var(--ink)}@media (max-width: 820px){.topbar,.session-hero,.page-title{align-items:flex-start;flex-direction:column}.topbar{padding:14px 18px;gap:12px}.brand{font-size:1.15rem}nav{gap:8px;width:100%;justify-content:flex-start}nav a{background:#eef6f7;border-radius:8px;padding:8px 12px;font-size:.9rem}.hero{min-height:420px;padding:28px;border-radius:12px}.hero h1{font-size:2.5rem}.hero .lead{font-size:1rem}.feature-row,.grid-list,.controller-grid,.answer-grid,.inline-form,.split,.editor,.builder,.builder-grid{grid-template-columns:1fr}.builder-rail{border-bottom:1px solid var(--line);border-right:0}.builder-topbar{align-items:stretch;flex-direction:column}.builder-workspace{padding:16px}.canvas-column{position:static}.settings-column{order:-1}.slide-canvas{padding:22px}.feature-row{gap:14px}.slide-rail{border-bottom:1px solid #e1e8f0;border-right:0;padding:16px}.qr{height:160px;width:160px}.session-hero{padding:24px}.session-code{font-size:3.5rem}.student-screen{align-items:stretch;padding:14px}.join-panel,.student-card{margin:0;max-width:none;width:100%}.student-card h1,.join-panel h1{font-size:2rem;line-height:1.08}.answer-grid button{min-height:72px;font-size:1rem}.auth-panel,.join-panel{margin:24px auto;padding:24px}.page,.home{padding:24px 16px}.actions{flex-direction:column}.actions .button{width:100%;justify-content:center}.toolbar{flex-direction:column}.toolbar button{width:100%;justify-content:center}}@media (max-width: 480px){:root{font-size:14px}.hero{min-height:350px;padding:20px}.hero h1{font-size:2rem}.session-hero{padding:18px}.session-code{font-size:2.5rem}.qr{height:140px;width:140px}.item-card h2{font-size:1.2rem}.panel,.item-card{padding:16px}}