:root{--primary: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--primary-ring: rgba(79, 70, 229, .25);--success: #10b981;--success-bg: #ecfdf5;--success-border: #a7f3d0;--danger: #ef4444;--danger-bg: #fef2f2;--danger-border: #fecaca;--warning: #f59e0b;--warning-bg: #fffbeb;--bg-main: #f8fafc;--bg-surface: #ffffff;--bg-subtle: #f1f5f9;--text-main: #0f172a;--text-muted: #64748b;--text-light: #94a3b8;--border-color: #e2e8f0;--border-hover: #cbd5e1;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--shadow-sm: 0 1px 3px rgba(0,0,0,.05);--shadow-md: 0 4px 12px -2px rgba(0,0,0,.08);--shadow-lg: 0 12px 24px -4px rgba(0,0,0,.1);--shadow-glow: 0 0 20px rgba(79, 70, 229, .15);--font-sans: "Plus Jakarta Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-main);color:var(--text-main);line-height:1.6;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer;border:none;background:none}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:999px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}.app-container{min-height:100vh;display:flex;flex-direction:column}.header{height:64px;background:var(--bg-surface);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:50;box-shadow:var(--shadow-sm)}.main-content{flex:1;display:flex;max-width:1600px;width:100%;margin:0 auto;gap:24px;padding:24px}.sidebar{width:320px;background:var(--bg-surface);border-radius:var(--radius-lg);border:1px solid var(--border-color);padding:20px;display:flex;flex-direction:column;gap:16px;height:calc(100vh - 112px);position:sticky;top:88px;overflow:hidden}.quiz-workspace{flex:1;display:flex;flex-direction:column;gap:20px;min-width:0}.card{background:var(--bg-surface);border-radius:var(--radius-lg);border:1px solid var(--border-color);padding:28px;box-shadow:var(--shadow-sm)}.grid-palette{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;padding-right:6px;overflow-y:auto;flex:1;min-height:0}.q-btn{height:38px;border-radius:var(--radius-sm);font-weight:600;font-size:13px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border-color);background:var(--bg-surface);color:var(--text-muted);transition:all .2s ease;position:relative}.q-btn:hover{border-color:var(--primary);color:var(--primary)}.q-btn.active{ring:2px solid var(--primary);border-color:var(--primary);box-shadow:var(--primary-ring);font-weight:700}.q-btn.answered{background:var(--primary-light);color:var(--primary);border-color:#c7d2fe}.q-btn.correct{background:var(--success-bg);color:var(--success);border-color:var(--success-border)}.q-btn.incorrect{background:var(--danger-bg);color:var(--danger);border-color:var(--danger-border)}.q-btn.bookmarked:after{content:"";position:absolute;top:2px;right:2px;width:6px;height:6px;border-radius:50%;background:var(--warning)}.options-list{display:flex;flex-direction:column;gap:12px;margin-top:20px}.option-item{display:flex;align-items:center;padding:14px 18px;border-radius:var(--radius-md);border:1.5px solid var(--border-color);background:var(--bg-surface);cursor:pointer;transition:all .2s ease;font-size:15px;gap:14px}.option-item:hover{border-color:var(--primary);background:#f8fafc}.option-item.selected{border-color:var(--primary);background:var(--primary-light);color:var(--primary);font-weight:600}.option-item.correct-reveal{border-color:var(--success);background:var(--success-bg);color:#065f46;font-weight:600}.option-item.incorrect-reveal{border-color:var(--danger);background:var(--danger-bg);color:#991b1b}.option-badge{width:28px;height:28px;border-radius:50%;border:1px solid var(--border-hover);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:13px;flex-shrink:0}.option-item.selected .option-badge{background:var(--primary);color:#fff;border-color:var(--primary)}.option-item.correct-reveal .option-badge{background:var(--success);color:#fff;border-color:var(--success)}.option-item.incorrect-reveal .option-badge{background:var(--danger);color:#fff;border-color:var(--danger)}.btn{padding:10px 20px;border-radius:var(--radius-md);font-weight:600;font-size:14px;display:inline-flex;align-items:center;gap:8px;transition:all .2s ease}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover);box-shadow:0 4px 12px #4f46e540}.btn-secondary{background:var(--bg-subtle);color:var(--text-main);border:1px solid var(--border-color)}.btn-secondary:hover{background:var(--border-color)}.btn-outline{border:1px solid var(--border-color);color:var(--text-muted)}.btn-outline:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-light)}.mobile-bottom-bar,.mobile-only-btn,.mobile-drawer-overlay-backdrop{display:none}.sidebar-wrapper{display:block}.desktop-only-toolbar{display:flex}@media(max-width:900px){.desktop-only-toolbar{display:none!important}.header{padding:0 12px;height:52px}.mobile-only-btn{display:flex!important}.header-title-box{display:flex;flex-direction:column}.main-content{flex-direction:column;padding:12px 12px 76px;gap:12px}.sidebar-wrapper{position:fixed;top:0;left:-100%;width:82%;max-width:320px;height:100vh;z-index:100;transition:left .3s cubic-bezier(.4,0,.2,1);box-shadow:4px 0 24px #00000026}.sidebar-wrapper.open{left:0}.sidebar{width:100%;height:100%;border-radius:0;border:none;overflow-y:auto}.mobile-sidebar-header{display:flex!important}.mobile-drawer-overlay-backdrop{display:block;position:fixed;top:0;left:0;right:0;bottom:0;background:#0f172a80;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:95}.card{padding:16px;border-radius:var(--radius-md)}.option-item{padding:12px 14px;font-size:14px;min-height:44px}.grid-palette{grid-template-columns:repeat(5,1fr);max-height:calc(100vh - 280px)}.q-btn{height:40px;font-size:13px}.mobile-bottom-bar{display:flex;position:fixed;bottom:0;left:0;right:0;height:60px;background:var(--bg-surface);border-top:1px solid var(--border-color);box-shadow:0 -4px 16px #00000014;z-index:80;align-items:center;justify-content:space-around;padding:0 10px;gap:8px}.mobile-bottom-btn{flex:1;height:42px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;gap:4px;font-weight:600;font-size:13px}}