:root{--primary: #818cf8;--primary-hover: #6366f1;--secondary: #34d399;--secondary-hover: #10b981;--danger: #f87171;--danger-hover: #ef4444;--warning: #fbbf24;--bg-color: #0f172a;--card-bg: #1e293b;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--border-color: #334155;--overlay-bg: rgba(0,0,0,.45);--success-bg: #064e3b;--success-text: #6ee7b7;--error-bg: #450a0a;--error-text: #fca5a5;--info-bg: #1e3a5f;--info-text: #93c5fd;--warning-bg: #451a03;--warning-text: #fbbf24;--inactive-bg: #374151;--inactive-text: #d1d5db;--muted-text: #9ca3af;--divider: #334155;--selected-bg: #312e81;--toggle-off: #4b5563;color-scheme:dark}:root[data-theme=light]{--bg-color: #f1f5f9;--card-bg: #ffffff;--text-primary: #0f172a;--text-secondary: #475569;--border-color: #cbd5e1;--overlay-bg: rgba(0,0,0,.2);--selected-bg: #e0e7ff;--inactive-bg: #e2e8f0;--inactive-text: #475569;--muted-text: #64748b;--divider: #cbd5e1;--toggle-off: #94a3b8;--success-bg: #d1fae5;--success-text: #065f46;--error-bg: #fee2e2;--error-text: #991b1b;--info-bg: #dbeafe;--info-text: #1e40af;--warning-bg: #fef3c7;--warning-text: #92400e;color-scheme:light}body{margin:0;font-family:Inter,sans-serif;background-color:var(--bg-color);color:var(--text-primary);-webkit-font-smoothing:antialiased;-webkit-text-size-adjust:100%;text-size-adjust:100%}*{box-sizing:border-box}button{font-family:inherit;transition:all .2s ease-in-out}button:active{transform:scale(.98)}.fade-in{animation:fadeIn .3s ease-out}.slide-up{animation:slideUp .4s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:none;opacity:1}}@keyframes slideInRight{0%{transform:translate(20px);opacity:0}to{transform:none;opacity:1}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.opt-btn{width:100%;text-align:left;padding:14px 16px;border-radius:10px;border:2px solid var(--border-color);background:var(--card-bg);cursor:pointer;font-size:15px;color:var(--text-primary);transition:all .15s;margin-bottom:10px;display:block;overflow-wrap:anywhere}@media(hover:hover){.opt-btn:hover{border-color:var(--primary);background:var(--selected-bg)}}.setup-page{max-width:760px;margin:0 auto;padding:32px 20px}.card{padding:20px 24px}.card-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px}.editor-textarea{font-size:13px}.quiz-layout{max-width:900px;margin:0 auto;padding:24px 16px;display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:20px;align-items:start}.quiz-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;margin-bottom:20px}.question-card{padding:24px}.quiz-sidebar{position:sticky;top:20px}.quiz-index-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}.quiz-legend{display:flex;flex-direction:column;gap:5px}.result-hero{padding:32px}.result-actions{display:flex;gap:10px}.modal-panel{padding:32px}.toast{top:24px;right:24px;max-width:320px}@media(max-width:720px){.quiz-layout{grid-template-columns:minmax(0,1fr);padding:16px 12px}.quiz-sidebar{position:static}.quiz-index-grid{grid-template-columns:repeat(auto-fill,minmax(40px,1fr))}.quiz-legend{flex-direction:row;flex-wrap:wrap;gap:8px 14px}}@media(max-width:480px){.setup-page{padding:20px 12px}.card,.question-card{padding:16px}.editor-textarea{font-size:16px}.quiz-nav>button{flex:1}.result-hero{padding:24px 16px}.result-actions{flex-direction:column}.modal-panel{padding:24px 20px}.toast{top:12px;right:12px;left:12px;max-width:none}}