:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5;font-weight:400;--accent: #4F46E5;--accent-light: #6366F1;--accent-dark: #1E1B4B;--surface: #ffffff;--surface-raised: #f8f9fc;--border: #e5e7eb;--border-light: #f0f1f4;--text-primary: #1a1a2e;--text-secondary: #6b7280;--shadow-sm: 0 1px 3px rgba(0,0,0,.06);--shadow-md: 0 4px 16px rgba(0,0,0,.08);--shadow-lg: 0 8px 32px rgba(0,0,0,.12);color:var(--text-primary);background-color:var(--surface);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:var(--accent);text-decoration:none;transition:color .2s ease}a:hover{color:var(--accent-light)}body{margin:0;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{font-family:inherit;cursor:pointer;transition:all .2s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}@keyframes pulse-subtle{0%,to{opacity:1}50%{opacity:.85}}#root{margin:0 auto}.app-bg{background:linear-gradient(145deg,#f8f9fc,#eef0f7 40%,#f5f3ff);min-height:100vh}.header-bar{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffd1;border-bottom:1px solid var(--border-light)}.topic-panel{animation:slideInLeft .4s ease both}.hero-overlay{position:absolute;top:32px;left:0;right:0;text-align:center;z-index:3;pointer-events:none;animation:fadeIn .8s ease .2s both}.hero-title{font-size:22px;font-weight:700;color:var(--text-primary);letter-spacing:-.4px;margin:0 0 6px}.hero-subtitle{font-size:14px;color:var(--text-secondary);margin:0;font-weight:400}.hero-hint{display:inline-flex;align-items:center;gap:6px;margin-top:10px;font-size:12px;color:var(--text-secondary);opacity:.7;letter-spacing:.2px}.bubble-glow{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60%;height:60%;border-radius:50%;background:radial-gradient(circle,rgba(79,70,229,.06) 0%,rgba(99,102,241,.03) 40%,transparent 70%);pointer-events:none;z-index:0}.quiz-cta{background:var(--accent);color:#fff;border:none;border-radius:12px;padding:14px 28px;font-size:15px;font-weight:600;cursor:pointer;position:relative;overflow:hidden;letter-spacing:.3px;box-shadow:0 2px 12px #4f46e54d;transition:transform .2s ease,box-shadow .2s ease}.quiz-cta:hover{transform:translateY(-2px);box-shadow:0 6px 20px #4f46e566}.quiz-cta:active{transform:translateY(0);box-shadow:0 2px 8px #4f46e54d}.resource-card{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--surface-raised);border:1px solid var(--border-light);border-radius:10px;transition:all .2s ease;text-decoration:none;color:var(--text-primary);font-size:13px;line-height:1.4;word-break:break-all}.resource-card:hover{background:#eef0ff;border-color:var(--accent-light);transform:translate(3px);color:var(--accent)}.resource-card .resource-icon{flex-shrink:0;width:28px;height:28px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:14px}.section-divider{height:1px;background:linear-gradient(90deg,var(--border) 0%,transparent 100%);margin:8px 0}.loading-container{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100%;gap:16px}.loading-spinner{width:32px;height:32px;border:3px solid var(--border-light);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}