:root{--bg:#f5f7fb;--bg-gradient-a:#7c3aed1f;--bg-gradient-b:#2563eb1f;--panel:#ffffffd1;--panel-strong:#fff;--text:#0f172a;--muted:#475569;--border:#0f172a1a;--accent:#2563eb;--accent-2:#7c3aed;--success:#15803d;--danger:#dc2626;--shadow:0 16px 40px #0f172a1f;--transition-bg:background-color .3s ease, color .3s ease}body.dark{--bg:#07101f;--bg-gradient-a:#7c3aed2e;--bg-gradient-b:#2563eb26;--panel:#0f172acc;--panel-strong:#0f172a;--text:#e5eefc;--muted:#9fb2cf;--border:#ffffff14;--accent:#60a5fa;--accent-2:#a78bfa;--success:#22c55e;--danger:#f87171;--shadow:0 20px 50px #0006}body.amber{--bg:#1c1208;--bg-gradient-a:#d9770638;--bg-gradient-b:#ea580c24;--panel:#291804c7;--panel-strong:#2a1a04;--text:#fef3c7;--muted:#d97706;--border:#fbbf2424;--accent:#f59e0b;--accent-2:#ea580c;--success:#86efac;--danger:#fb7185;--shadow:0 16px 40px #0006}body.butter{--bg:#fdfbd4;--bg-gradient-a:#ca8a041a;--bg-gradient-b:#b4780012;--panel:#fdf7c8d9;--panel-strong:#faf5c8;--text:#2d2007;--muted:#7c5e1a;--border:#b48c0029;--accent:#b45309;--accent-2:#ca8a04;--success:#166534;--danger:#b91c1c;--shadow:0 16px 40px #643c001a}body.sakura{--bg:#fedfe1;--bg-gradient-a:#b43c5a1a;--bg-gradient-b:#c8506412;--panel:#ffebedd1;--panel-strong:#fff0f2;--text:#2d1a1e;--muted:#8a4a58;--border:#a03c5024;--accent:#9b2335;--accent-2:#c0404e;--success:#166534;--danger:#b91c1c;--shadow:0 16px 40px #781e321f}body.matcha{--bg:#e4f8ba;--bg-gradient-a:#78be3c1f;--bg-gradient-b:#5aa01e14;--panel:#f4ffe3e0;--panel-strong:#f4ffe3;--text:#2f3e1f;--muted:#5a7a3a;--border:#508c1e24;--accent:#4f8a1e;--accent-2:#7bbf2e;--success:#166534;--danger:#b91c1c;--shadow:0 16px 40px #3c64141a}*{box-sizing:border-box}html{background-color:var(--bg);min-height:100%;transition:var(--transition-bg);margin:0;padding:0;overflow-x:hidden}body{background:radial-gradient(circle at top left, var(--bg-gradient-a), transparent 26%), radial-gradient(circle at top right, var(--bg-gradient-b), transparent 28%), var(--bg);width:100%;min-height:100vh;color:var(--text);margin:0;padding:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;transition:background-color .28s,color .2s;overflow-x:hidden}button,input{font:inherit}.hidden{display:none!important}#app{max-width:1180px;margin:0 auto;padding:24px}.main-content{transition:opacity .15s;position:relative}.topbar{justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;display:flex}.topbar-brand{align-items:center;gap:12px;display:flex}.topbar-logo{box-shadow:none;background:0 0;border-radius:0;justify-content:center;align-items:center;width:auto;height:auto;display:flex}.topbar-logo img{object-fit:contain;width:40px;height:40px;display:block}.topbar-title{font-size:1.1rem;font-weight:800}.topbar-actions{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.chip{border:1px solid var(--border);background:var(--panel);color:var(--text);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:14px;padding:10px 14px;font-size:.92rem;font-weight:600}.btn-icon{border:1px solid var(--border);background:var(--panel);color:var(--text);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);cursor:pointer;border-radius:14px;padding:10px 14px;font-size:1rem;transition:transform .16s,background .16s,border-color .16s}.btn-icon:hover{border-color:#2563eb52;transform:translateY(-1px)}.view{background:var(--panel);border:1px solid var(--border);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-radius:28px;padding:26px;animation:.22s fadeSlide}.hero{place-items:center;min-height:72vh;display:grid}.hero-card{text-align:center;width:min(840px,100%);padding:48px 24px}.hero-logo{justify-content:center;align-items:center;margin:0 auto 20px;display:flex}.hero-logo img{object-fit:contain;width:88px;height:88px;display:block}.kicker{color:var(--accent);background:#2563eb1a;border-radius:999px;align-items:center;gap:10px;margin-bottom:18px;padding:10px 14px;font-size:.95rem;font-weight:700;display:inline-flex}h1,h2,h3,p{margin:0}.hero h1{margin-bottom:16px;font-size:clamp(2.3rem,6vw,4.4rem);line-height:1}.subtitle{color:var(--muted);max-width:720px;margin:0 auto 28px;font-size:1.08rem;line-height:1.55}.footer-note{color:var(--muted);margin-top:18px;font-size:.92rem}.primary{color:#fff;background:linear-gradient(135deg, var(--accent), var(--accent-2));cursor:pointer;letter-spacing:.02em;border:none;border-radius:18px;padding:15px 26px;font-weight:800;transition:transform .16s,filter .16s;box-shadow:0 14px 32px #2563eb47}.primary:hover{filter:brightness(1.04);transform:translateY(-2px)scale(1.01)}.primary:disabled{opacity:.5;cursor:not-allowed;transform:none}.secondary{border:1px solid var(--border);color:var(--text);background:var(--panel-strong);cursor:pointer;border-radius:18px;padding:13px 20px;font-weight:700;transition:transform .16s,border-color .16s}.secondary:hover{border-color:#2563eb47;transform:translateY(-1px)}.ghost{color:var(--muted);cursor:pointer;background:0 0;border:1px solid #96969626;border-radius:18px;padding:12px 16px;font-size:.95rem;font-weight:600;transition:all .16s}.ghost:hover{color:var(--text);background:#9696960d}.grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;display:grid}.category-card,.mode-card{background:var(--panel-strong);border:1px solid var(--border);cursor:pointer;border-radius:22px;padding:20px;transition:transform .16s,border-color .16s,box-shadow .16s}.category-card:hover,.mode-card:hover{border-color:#2563eb47;transform:translateY(-3px);box-shadow:0 14px 30px #2563eb1a}.category-card .count,.mode-card .count{color:var(--muted);margin-top:8px;font-size:.95rem}.section-head{flex-wrap:wrap;justify-content:space-between;align-items:end;gap:16px;margin-bottom:18px;display:flex}.section-head p{color:var(--muted);margin-top:8px}.modes-grid{grid-template-columns:1fr 1fr;gap:20px;display:grid}.mode-card{border-radius:24px;padding:40px 36px}.mode-card__icon{margin-bottom:14px;font-size:2.4rem;line-height:1}.mode-card h3{margin-bottom:10px;font-size:1.5rem;font-weight:800}.mode-card__desc{color:var(--muted);font-size:1rem;line-height:1.55}.mode-card--loop{border-color:#dc262633}.mode-card--loop:hover{border-color:#dc262673;box-shadow:0 14px 30px #dc26261f}body.dark .mode-card--loop{border-color:#f871712e}body.amber .mode-card--loop{border-color:#fb718538}.mode-card--random:hover{border-color:#2563eb61;box-shadow:0 14px 30px #2563eb1f}@media (width<=640px){.modes-grid{grid-template-columns:1fr}.mode-card{padding:24px 20px}}.auth-grid{grid-template-columns:1.15fr 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var(--accent-2));border-radius:999px;width:0%;height:100%;transition:width .22s}.q-card{background:var(--panel-strong);border:1px solid var(--border);border-radius:26px;padding:22px;animation:.2s fadeSlide}@keyframes fadeSlide{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.question-text{margin-bottom:18px;font-size:1.12rem;line-height:1.6}.options{gap:12px;display:grid}.option{text-align:left;border:1px solid var(--border);width:100%;color:var(--text);cursor:pointer;background:0 0;border-radius:18px;align-items:flex-start;gap:12px;padding:16px 18px;transition:transform .12s,border-color .12s,background .12s;display:flex}.option:hover:not(.correct):not(.incorrect):not(:disabled){border-color:#2563eb47;transform:translate(2px)}.option.correct{background:#22c55e1a;border-color:#15803d73}.option.incorrect{background:#f871711c;border-color:#dc262673}.option .letter{background:#94a3b82e;border-radius:50%;flex:0 0 34px;place-items:center;width:34px;height:34px;font-weight:800;display:grid}.option.correct .letter{color:var(--success);background:#22c55e2e}.option.incorrect .letter{color:var(--danger);background:#f871712e}.option:disabled{cursor:default;opacity:.7}.feedback{min-height:28px;margin-top:14px;font-weight:800}.feedback.ok{color:var(--success)}.feedback.bad{color:var(--danger)}.exam-actions{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.stats{flex-wrap:wrap;gap:10px;display:flex}.stat{background:var(--panel-strong);border:1px solid var(--border);border-radius:14px;padding:10px 14px;font-weight:700}.result-box{text-align:center;padding:34px 18px}.result-box h2{margin-bottom:10px;font-size:2rem}.result-box p{color:var(--muted);max-width:700px;margin:0 auto 16px;line-height:1.6}.small{color:var(--muted);font-size:.92rem}.text-center{text-align:center}.loading-spinner{border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:24px;height:24px;animation:.6s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}body.protected{-webkit-user-select:none;user-select:none}body.protected input,body.protected textarea,body.protected select,body.protected [contenteditable=true],body.protected [contenteditable]{-webkit-user-select:text;user-select:text}body.protected .question-text,body.protected .options,body.protected .option{-webkit-user-select:none;user-select:none}#watermark-overlay{color:#94a3b826;pointer-events:none;z-index:9999;letter-spacing:.06em;text-transform:uppercase;white-space:nowrap;font-size:.95rem;font-weight:800;position:fixed;bottom:24px;right:28px;transform:rotate(-14deg)}.toast{z-index:10000;border-radius:16px;padding:14px 24px;font-size:.95rem;font-weight:700;animation:.3s toastIn;position:fixed;bottom:24px;left:50%;transform:translate(-50%);box-shadow:0 8px 24px #0000002e}.toast.error{background:var(--danger);color:#fff}.toast.success{background:var(--success);color:#fff}.toast.info{background:var(--accent);color:#fff}@keyframes toastIn{0%{opacity:0;transform:translate(-50%)translateY(10px)}to{opacity:1;transform:translate(-50%)translateY(0)}}.admin-table{border-collapse:collapse;width:100%;font-size:.92rem}.admin-table th{text-align:left;border-bottom:2px solid var(--border);color:var(--muted);text-transform:uppercase;letter-spacing:.04em;padding:10px 12px;font-size:.85rem;font-weight:800}.admin-table td{border-bottom:1px solid var(--border);vertical-align:middle;padding:12px}.admin-table tr:last-child td{border-bottom:none}.admin-table tr:hover td{background:#2563eb08}.btn-sm{border:1px solid var(--border);background:var(--panel-strong);color:var(--text);cursor:pointer;border-radius:10px;margin-right:6px;padding:6px 12px;font-size:.82rem;font-weight:700;transition:transform .12s,border-color .12s}.btn-sm:hover{border-color:#2563eb47;transform:translateY(-1px)}@media (width<=880px){.auth-grid,.exam-top{grid-template-columns:1fr}.admin-table{font-size:.82rem}.admin-table th,.admin-table td{padding:8px 6px}}@media (width<=600px){#app{box-sizing:border-box;width:100%;max-width:100%;padding:16px}.hero{width:100%;min-height:56vh;overflow:hidden}.hero-card{box-sizing:border-box;text-align:center;width:100%;max-width:100%;margin-inline:auto;padding:28px 0}.hero h1{font-size:clamp(1.8rem,8.5vw,2.8rem)}.subtitle{padding-inline:4px;font-size:.98rem}.hero-logo img{width:72px;height:72px}.topbar,.topbar-actions{flex-wrap:wrap;gap:8px}.view{border-radius:20px;padding:18px 16px}}