:root{--brand: #4B3FE3;--brand-soft: #F2F7FF;--surface: #F7F7F8;--surface-muted: #EFEFF2;--text: #171717;--text-muted: #52525B;--border: rgba(23, 23, 23, .1);--card-bg: #fff;--success: #1DC981;--accent: #FF6B35;--radius: 10px;--radius-lg: 16px;--font: "SF Pro Text", "PingFang SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif}@media (prefers-color-scheme: dark){:root{--brand: #8B7FFF;--brand-soft: rgba(139, 127, 255, .12);--surface: #141416;--surface-muted: #1E1E22;--text: #F0F0F2;--text-muted: #8E8E93;--border: rgba(255, 255, 255, .1);--card-bg: #1C1C1E;--accent: #FF8A5C}}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%;font-family:var(--font);font-size:15px;line-height:1.6;color:var(--text);background:var(--surface);-webkit-font-smoothing:antialiased}button{font-family:var(--font);cursor:pointer;border:none;outline:none}.app-layout{max-width:640px;margin:0 auto;padding:0 16px;min-height:100%;display:flex;flex-direction:column}.app-header{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-bottom:1px solid var(--border);margin-bottom:20px}.app-header h1{font-size:17px;font-weight:600;color:var(--brand)}.app-header nav{display:flex;gap:6px}.app-header nav a{font-size:13px;color:var(--text-muted);padding:5px 10px;border-radius:8px;text-decoration:none}.app-header nav a.active{color:var(--brand);background:var(--brand-soft);font-weight:500}.app-content{flex:1;padding-bottom:40px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 18px;border-radius:var(--radius);font-weight:500;font-size:15px;transition:opacity .15s}.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{opacity:.9}.btn-secondary{background:var(--surface-muted);color:var(--text)}.btn-block{width:100%}.btn-lg{padding:14px;font-size:16px;font-weight:600;border-radius:12px}.home{padding:20px 0}.home-countdown{text-align:center;padding:40px 0 20px}.countdown-days{font-size:72px;font-weight:700;color:var(--brand);line-height:1;font-variant-numeric:tabular-nums}.countdown-label{font-size:15px;color:var(--text-muted);margin-top:8px}.home-total{text-align:center;font-size:14px;color:var(--text-muted);margin-bottom:32px}.home-actions{display:grid;gap:12px;max-width:320px;margin:0 auto}.action-btn{padding:24px;border-radius:var(--radius-lg);text-align:left;background:var(--card-bg);border:1px solid var(--border);transition:all .15s}.action-btn:hover{border-color:var(--brand);transform:translateY(-1px)}.action-title{font-size:20px;font-weight:600;color:var(--text);margin-bottom:4px}.action-desc{font-size:13px;color:var(--text-muted)}.action-challenge .action-title{color:var(--accent)}.browse-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:12px}.page-title{font-size:20px;font-weight:600}.chapter-select{padding:6px 10px;border-radius:8px;border:1px solid var(--border);background:var(--card-bg);color:var(--text);font-size:13px;max-width:200px;font-family:var(--font)}.kp-list{display:grid;gap:8px}.kp-item{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px;cursor:pointer;transition:border-color .15s}.kp-item:hover{border-color:var(--brand)}.kp-chapter{font-size:11px;color:var(--text-muted);margin-bottom:2px}.kp-title{font-size:14px;font-weight:500}.detail-view{animation:fadeIn .2s}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.back-btn{background:none;color:var(--brand);font-size:14px;padding:4px 0;margin-bottom:16px}.detail-chapter{font-size:13px;color:var(--text-muted);margin-bottom:4px}.detail-title{font-size:22px;font-weight:600;margin-bottom:16px;line-height:1.4}.detail-summary{background:var(--card-bg);border-radius:var(--radius);padding:16px;font-size:15px;line-height:1.7;margin-bottom:16px;border:1px solid var(--border)}.detail-fields{display:grid;gap:8px}.detail-field{background:var(--card-bg);border-radius:var(--radius);padding:12px 14px;border:1px solid var(--border)}.detail-field-label{font-size:12px;font-weight:600;color:var(--brand);margin-bottom:4px}.detail-field-content{font-size:14px;line-height:1.6}.challenge{display:flex;flex-direction:column;min-height:calc(100vh - 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