:root{--font-sans:var(--font-plex-sans,"IBM Plex Sans"),system-ui,-apple-system,"Segoe UI",sans-serif;--font-mono:var(--font-plex-mono,"IBM Plex Mono"),ui-monospace,"Cascadia Mono",Consolas,monospace;--font-display:var(--font-sans);--bg:#f7f6fb;--bg-2:#f1f0f6;--surface:#fff;--surface-2:#fafafc;--ink:#0f0a3c;--ink-2:#2b1b5c;--ink-3:#5f4da4;--ink-muted:#625e7a;--ink-faint:#9a97ae;--line:#e4e3ec;--line-strong:#cfcddb;--brand-pink:#ff5757;--brand-purple:#8c52ff;--gradient-primary:linear-gradient(90deg,#ff5757,#8c52ff);--gradient-primary-hover:linear-gradient(90deg,#ee4646,#7c42f0);--gradient-primary-diagonal:linear-gradient(135deg,#ff5757,#8c52ff);--gradient-subtle:linear-gradient(135deg,rgba(255,87,87,.06),rgba(140,82,255,.06));--gradient-border:linear-gradient(90deg,rgba(255,87,87,.35),rgba(140,82,255,.35));--accent:#7c3aed;--accent-hover:#6d28d9;--accent-soft:#f3eeff;--warm:#ff8a4c;--warm-hot:#ff5a36;--highlight:#ffe4b5;--success:#059669;--danger:#dc2626;--radius-sm:4px;--radius:6px;--radius-lg:10px;--shadow-sm:0 1px 2px rgba(15,10,60,.05),0 4px 14px rgba(140,82,255,.05);--shadow-md:0 1px 2px rgba(15,10,60,.05),0 10px 28px rgba(140,82,255,.09);--shadow-lg:0 2px 4px rgba(15,10,60,.06),0 18px 44px rgba(140,82,255,.14);--shadow-brand:0 6px 18px rgba(200,70,190,.28)}*{margin:0;padding:0;box-sizing:border-box}body,html{font-family:var(--font-sans);color:var(--ink);background:var(--bg);min-height:100vh;-webkit-font-smoothing:antialiased;font-feature-settings:"tnum" 0}body{background:radial-gradient(900px 480px at 0 -8%,rgba(255,87,87,.1),transparent 60%),radial-gradient(900px 520px at 100% -10%,rgba(140,82,255,.13),transparent 60%),var(--bg);background-repeat:no-repeat}::-moz-selection{background:rgba(140,82,255,.2)}::selection{background:rgba(140,82,255,.2)}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:2px}::-webkit-scrollbar-thumb:hover{background:var(--ink-faint)}.font-display{font-family:var(--font-sans);font-weight:700;letter-spacing:-.02em}.font-hero{font-family:var(--font-fraunces,"Fraunces"),Georgia,serif;font-weight:900;letter-spacing:-.01em}.font-hero .italic{font-style:italic}.font-mono,code,kbd,samp{font-family:var(--font-mono)}a{color:inherit;text-decoration:none}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.glass-card,.glass-card-solid{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.glass-card-dark{background:var(--ink);color:#fff;border-radius:var(--radius-lg);border:1px solid var(--ink)}.card-accent{position:relative;overflow:hidden}.card-accent:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--gradient-primary)}.input,.select,.textarea{width:100%;padding:11px 12px;background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--radius);font-size:14px;font-family:inherit;color:var(--ink);outline:none;transition:border-color .12s ease,box-shadow .12s ease}.input:hover,.select:hover,.textarea:hover{border-color:var(--ink-faint)}.input:focus,.select:focus,.textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(124,58,237,.15)}.input::-moz-placeholder,.textarea::-moz-placeholder{color:var(--ink-faint)}.input::placeholder,.textarea::placeholder{color:var(--ink-faint)}.select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 4.5L6 8l3.5-3.5' stroke='%230F0A3C' stroke-width='1.5' fill='none' opacity='0.6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:34px;cursor:pointer}.select option:disabled{color:var(--ink-faint)}.textarea{resize:vertical;min-height:80px;line-height:1.5}.form-label{display:block;font-family:var(--font-mono);font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-muted);margin-bottom:6px}.form-section-divider{height:1px;background:var(--line);margin:4px 0}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border:1px solid transparent;border-radius:var(--radius);font-size:14px;font-weight:600;font-family:inherit;line-height:1.2;cursor:pointer;transition:background .12s ease,border-color .12s ease,color .12s ease,filter .12s ease;outline:none;text-decoration:none;white-space:nowrap}.btn-sm{padding:7px 12px;font-size:13px}.btn-lg{padding:13px 22px;font-size:15px}.btn-icon{padding:8px;width:36px;height:36px;justify-content:center}.btn:disabled{opacity:.5;cursor:not-allowed}.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-brand)}.btn-primary:hover:not(:disabled){background:var(--gradient-primary-hover)}.btn-primary:active:not(:disabled){filter:brightness(.95)}.btn-accent{background:var(--gradient-primary-diagonal);color:#fff;box-shadow:var(--shadow-brand)}.btn-accent:hover:not(:disabled){background:var(--gradient-primary-hover)}.btn-glass{background:var(--surface);color:var(--ink);border-color:var(--line-strong)}.btn-glass:hover:not(:disabled){border-color:var(--ink)}.btn-dark{background:var(--ink);color:#fff}.btn-dark:hover:not(:disabled){background:#241b5e}.btn-ghost{background:transparent;color:var(--ink);padding:7px 10px}.btn-ghost:hover:not(:disabled){background:rgba(15,10,60,.05)}.gradient-text,.gradient-text-diagonal{background:var(--gradient-primary);background-clip:text;-webkit-background-clip:text;color:transparent;-webkit-text-fill-color:transparent;display:inline-block}.gradient-text-diagonal{background:var(--gradient-primary-diagonal);background-clip:text;-webkit-background-clip:text}@supports not ((-webkit-background-clip:text) or (background-clip:text)){.gradient-text,.gradient-text-diagonal{color:var(--brand-purple);background:none;-webkit-text-fill-color:initial}}@keyframes spin-slow{to{transform:rotate(1turn)}}.animate-spin-slow{animation:spin-slow 1s linear infinite}@keyframes pulse-glow{0%,to{box-shadow:0 0 0 0 rgba(140,82,255,.35)}50%{box-shadow:0 0 0 8px rgba(140,82,255,0)}}.animate-pulse-glow{animation:pulse-glow 2s ease-in-out infinite}@media (prefers-reduced-motion:reduce){.animate-pulse-glow,.mbc-waiting{animation:none}}.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;background:var(--accent-soft);color:var(--accent-hover);border:1px solid #ddd0fd;border-radius:999px;font-family:var(--font-mono);font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:.06em}.chip-success{background:#ecfdf5;color:#047857;border-color:#a7f3d0}.chip-warning{background:#fff7ed;color:#c2410c;border-color:#fed7aa}.chip-danger{background:#fef2f2;color:#b91c1c;border-color:#fecaca}.text-muted{color:var(--ink-muted)}.text-accent{color:var(--accent)}.text-success{color:var(--success)}.text-danger{color:var(--danger)}.divider{height:1px;background:var(--line);width:100%}.divider-strong{height:1px;background:var(--line-strong);width:100%}.katex{font-size:1.05em!important}.katex-display{margin:1em 0!important;overflow-x:auto;overflow-y:hidden;padding:8px 0}.math-deco{position:absolute;font-family:var(--font-mono);font-weight:400;color:rgba(140,82,255,.045);pointer-events:none;-webkit-user-select:none;-moz-user-select:none;user-select:none;z-index:0;line-height:1}.countdown-cell{padding:12px 10px;min-width:72px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);text-align:center}.countdown-num{font-family:var(--font-mono);font-size:34px;font-weight:600;line-height:1;color:var(--ink);font-variant-numeric:tabular-nums}.countdown-label{font-family:var(--font-mono);font-size:10px;font-weight:500;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-muted);margin-top:6px}.role-card-primary{display:block;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);transition:border-color .12s ease}.role-card-primary:hover{border-color:var(--brand-purple)}.role-link-secondary{color:var(--ink-muted);font-size:12px;font-weight:500;text-decoration:none}.role-link-secondary:hover{color:var(--accent);text-decoration:underline}.mcq-option{display:flex;align-items:center;gap:12px;padding:12px 14px;margin-bottom:8px;border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--surface);cursor:pointer;transition:border-color .12s ease,background .12s ease}.mcq-option:hover{border-color:var(--brand-purple)}.mcq-option.selected{border-color:var(--accent);background:var(--accent-soft);box-shadow:inset 0 0 0 1px var(--accent)}.mcq-option-letter{width:30px;height:30px;flex-shrink:0;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);border:1px solid var(--line-strong);font-family:var(--font-mono);font-weight:600;font-size:14px;color:var(--ink)}.mcq-option.selected .mcq-option-letter{background:var(--gradient-primary-diagonal);border-color:transparent;color:#fff}.exam-timer-wrap{position:fixed;top:16px;left:50%;transform:translateX(-50%);z-index:100}.exam-timer{display:flex;align-items:center;gap:14px;padding:8px 14px;border-radius:var(--radius);background:var(--gradient-primary);box-shadow:var(--shadow-lg);color:#fff}.exam-timer.warn{background:#dc2626}.exam-timer-label{font-family:var(--font-mono);font-size:10px;text-transform:uppercase;letter-spacing:.08em;font-weight:500;opacity:.9}.exam-timer-num{font-family:var(--font-mono);font-size:20px;font-weight:600;line-height:1.15;font-variant-numeric:tabular-nums}.q-nav-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}.q-nav-cell{aspect-ratio:1/1;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);border:1px solid var(--line-strong);background:var(--surface);font-family:var(--font-mono);font-size:13px;font-weight:600;color:var(--ink);cursor:pointer;transition:border-color .12s ease}.q-nav-cell:hover{border-color:var(--brand-purple)}.q-nav-cell.answered{background:#ede5ff;border-color:#c4b0fb;color:#4c1d95}.q-nav-cell.flagged{background:#fef3c7;border-color:#f59e0b;color:#78350f}.q-nav-cell.current{box-shadow:inset 0 0 0 2px var(--accent);border-color:var(--accent)}@keyframes mbc-waiting-flip{0%,35%{transform:rotate(0deg)}50%,85%{transform:rotate(180deg)}to{transform:rotate(1turn)}}.mbc-waiting{display:inline-block;animation:mbc-waiting-flip 3s ease-in-out infinite}.tabs{display:flex;flex-wrap:wrap;gap:0;margin-bottom:24px;border-bottom:1px solid var(--line)}.tabs .tab{display:inline-flex;align-items:center;gap:6px;padding:10px 16px;margin-bottom:-1px;border:none;border-bottom:2px solid transparent;background:transparent;color:var(--ink-muted);font-family:inherit;font-size:14px;font-weight:500;cursor:pointer;white-space:nowrap;transition:color .12s,border-color .12s}.tabs .tab:hover{color:var(--ink)}.tabs .tab.active{color:var(--ink);font-weight:600;border-bottom-color:var(--brand-purple)}.editor-bar{display:flex;flex-wrap:wrap;gap:4px;padding:8px;background:var(--surface-2);border:1px solid var(--line-strong);border-bottom:none;border-radius:var(--radius) var(--radius) 0 0}.editor-bar button{display:inline-flex;align-items:center;gap:5px;padding:5px 10px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);color:var(--ink-2);font-family:var(--font-mono);font-size:12px;font-weight:500;cursor:pointer;transition:background .12s,color .12s,border-color .12s}.editor-bar button:hover{background:var(--ink);border-color:var(--ink);color:#fff}@media (max-width:768px){.btn-lg{padding:12px 18px;font-size:14px}.countdown-num{font-size:28px}.countdown-cell{min-width:62px}}.chip-dot:before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor;box-shadow:0 0 0 3px color-mix(in srgb,currentColor 20%,transparent)}.card-gradient-border{border:1px solid transparent;background:linear-gradient(var(--surface),var(--surface)) padding-box,linear-gradient(135deg,rgba(255,87,87,.55),rgba(140,82,255,.55)) border-box}.countdown-num.gradient-text{display:block}.glow{position:relative;isolation:isolate}.glow:after{content:"";position:absolute;inset:-40px -30px;z-index:-1;background:radial-gradient(closest-side,rgba(140,82,255,.18),transparent),radial-gradient(closest-side at 20% 80%,rgba(255,87,87,.14),transparent);filter:blur(8px);pointer-events:none}.badge{display:inline-flex;align-items:center;gap:5px;padding:2px 8px;border-radius:999px;border:1px solid #ddd0fd;background:var(--accent-soft);color:var(--accent-hover);font-size:12px;font-weight:600;white-space:nowrap}.badge-success{background:#ecfdf5;color:#047857;border-color:#a7f3d0}.badge-warning{background:#fffbeb;color:#b45309;border-color:#fde68a}.badge-danger{background:#fef2f2;color:#b91c1c;border-color:#fecaca}.badge-muted{background:#f4f4f7;color:#4b4863;border-color:var(--line)}.stat-num{font-family:var(--font-mono);font-size:30px;font-weight:600;line-height:1.1;font-variant-numeric:tabular-nums}.lb-row{display:grid;grid-template-columns:60px minmax(0,1fr) auto;gap:14px;align-items:center;padding:12px 14px;border-top:1px solid var(--line)}.lb-row:first-child{border-top:none}.lb-row.bronze,.lb-row.gold,.lb-row.silver{background:#fffdf7}