:root{--p:#6366f1;--bg:#f1f5f9;--text:#1e293b;--muted:#64748b;--danger:#ef4444;--success:#10b981;--warn:#f59e0b;--card:#fff;--border:#e2e8f0;--radius:14px}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:14px;user-select:none}
body.dark{--bg:#0f172a;--text:#e2e8f0;--card:#1e293b;--border:#334155;--muted:#94a3b8}
.topnav{width:100%;max-width:620px;display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;min-height:36px}
.nav-right{display:flex;gap:8px;align-items:center}
.muted-sm{font-size:13px;color:var(--muted)}
.nav-btn{padding:7px 14px;border-radius:20px;border:1px solid var(--border);background:var(--card);color:var(--muted);font-size:12px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:5px;transition:.2s;text-decoration:none}
.nav-btn:hover{border-color:var(--p);color:var(--p)}
.nav-btn.pri{background:var(--p);color:#fff;border:none}
.theme-btn{background:none;border:1px solid var(--border);border-radius:8px;padding:5px 9px;cursor:pointer;font-size:15px;color:var(--muted)}
.card{width:100%;max-width:620px;background:var(--card);padding:26px;border-radius:20px;box-shadow:0 8px 30px rgba(0,0,0,.08)}
.logo{display:block;margin:0 auto 18px;max-height:56px;width:auto}
h1{text-align:center;font-size:1.45rem;color:var(--text);margin-bottom:8px}
.sub{text-align:center;color:var(--muted);font-size:.88rem;margin-bottom:22px}
input,select{width:100%;padding:13px 16px;border-radius:12px;border:2px solid var(--border);font-size:15px;outline:none;background:var(--bg);color:var(--text);margin-bottom:12px;font-family:inherit;transition:.2s}
input:focus,select:focus{border-color:var(--p);background:var(--card)}
.btn{width:100%;padding:13px;background:var(--p);color:#fff;border:none;border-radius:12px;font-size:14px;font-weight:700;cursor:pointer;margin-top:4px;display:flex;align-items:center;justify-content:center;gap:7px;font-family:inherit;transition:.2s}
.btn:hover:not(:disabled){filter:brightness(1.1);transform:translateY(-1px)}
.btn:disabled{opacity:.6;cursor:not-allowed}
.btn.ghost{background:transparent;color:var(--p);border:2px solid var(--p)}
.btn.success-btn{background:var(--success)}
.btn.wa-btn{background:#25d366;margin-top:8px}
.hidden{display:none!important}
.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite;vertical-align:middle}
@keyframes spin{to{transform:rotate(360deg)}}

/* QUIZ */
.timer-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:.88rem;font-weight:600;color:var(--muted)}
.timer-num{font-size:1.2rem;font-weight:800;color:var(--p)}
.timer-num.warn{color:var(--warn)}
.timer-num.danger{color:var(--danger);animation:flash .5s infinite}
.progress-track{height:5px;background:var(--border);border-radius:10px;margin-bottom:18px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--p),#8b5cf6);transition:width .3s;border-radius:10px}
.q-text{font-size:1.05rem;font-weight:700;line-height:1.55;margin-bottom:20px}
.opt{padding:13px 16px;border:2px solid var(--border);border-radius:12px;margin-bottom:10px;cursor:pointer;font-weight:500;font-size:.93rem;transition:.18s;display:flex;align-items:center;gap:10px;background:var(--card);color:var(--text)}
.opt:hover:not(.locked){border-color:#a5b4fc;background:#f5f3ff;transform:translateX(3px)}
.opt.correct{border-color:var(--success);background:#ecfdf5;color:#065f46}
.opt.wrong{border-color:var(--danger);background:#fef2f2;color:#991b1b}
.opt.locked{pointer-events:none}
.opt-letter{width:26px;height:26px;border-radius:7px;background:var(--border);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:800;flex-shrink:0}
.opt.correct .opt-letter{background:var(--success);color:#fff}
.opt.wrong .opt-letter{background:var(--danger);color:#fff}
.warn-banner{background:#fef2f2;border:1px solid #ef4444;color:#b91c1c;padding:9px 14px;border-radius:9px;font-size:13px;text-align:center;margin-bottom:14px;display:none;animation:flash 1s infinite}

/* HINT */
.hint-zone{margin-top:18px;display:none}
.hint-zone.show{display:block}
.hint-btn{width:100%;padding:10px;background:rgba(99,102,241,.07);border:1.5px dashed var(--p);color:var(--p);border-radius:10px;font-size:13px;font-weight:600;cursor:pointer;transition:.2s}
.hint-btn:hover{background:rgba(99,102,241,.14)}
.hint-reveal{margin-top:10px;background:var(--bg);border-left:4px solid var(--p);border-radius:0 10px 10px 0;padding:12px 14px;font-size:13.5px;line-height:1.65;display:none;animation:fadeUp .3s}
.hint-reveal.show{display:block}
.hint-tag{font-size:11px;font-weight:700;color:var(--p);text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px}
.hint-concept{display:inline-flex;align-items:center;gap:5px;background:rgba(99,102,241,.1);color:var(--p);padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600;margin-bottom:8px}

/* FEEDBACK */
.feedback{margin-top:18px;display:none;animation:fadeUp .3s}
.feedback.show{display:block}
.fb-correct{background:#ecfdf5;border:1px solid #6ee7b7;border-radius:12px;padding:14px;color:#065f46;font-size:13.5px;line-height:1.6}
.fb-wrong{background:#fef2f2;border:1px solid #fca5a5;border-radius:12px;padding:14px;color:#991b1b;font-size:13.5px;line-height:1.6}
.fb-label{font-weight:800;margin-bottom:5px;font-size:12px;text-transform:uppercase;letter-spacing:.06em}
.fb-explanation{margin-top:8px;color:var(--text);border-top:1px solid rgba(0,0,0,.08);padding-top:8px}

/* RESULT */
.score-circle{width:110px;height:110px;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 16px;font-weight:800;border:4px solid var(--p)}
.score-num{font-size:1.8rem;color:var(--p);line-height:1}
.score-sub{font-size:12px;color:var(--muted)}

/* SCHEDULE */
.schedule-badge{display:inline-flex;align-items:center;gap:5px;padding:4px 12px;border-radius:20px;font-size:12px;font-weight:700}
.badge-live{background:#dcfce7;color:#16a34a}
.badge-upcoming{background:#fef9c3;color:#ca8a04}
.badge-expired{background:#fee2e2;color:#dc2626}

@keyframes flash{0%,100%{opacity:1}50%{opacity:.4}}
@keyframes fadeUp{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}