:root{--primary: #4f46e5;--primary-2: #7c3aed;--primary-light: #eef2ff;--success: #16a34a;--success-bg: #f0fdf4;--danger: #dc2626;--danger-bg: #fef2f2;--warning: #d97706;--warning-bg: #fff7ed;--amber-bg: #fffbeb;--bg: #f2f4f9;--card: #ffffff;--text: #1f2430;--text-2: #6b7280;--border: #e6e8ef;--radius: 16px;--radius-sm: 12px;--nav-h: 62px;--shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 4px 14px rgba(16, 24, 40, .05)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html{-webkit-text-size-adjust:100%}body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Segoe UI,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}button{font-family:inherit}input{font-family:inherit;font-size:16px}#app{max-width:520px;margin:0 auto;min-height:100vh;background:var(--bg)}@keyframes fadeUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.page{padding:16px 16px calc(var(--nav-h) + 28px + env(safe-area-inset-bottom));animation:fadeUp .25s ease}.flex{display:flex;align-items:center;gap:12px}.grow{flex:1;min-width:0}.bignum{font-size:22px;font-weight:800;color:var(--primary);font-variant-numeric:tabular-nums}.muted{color:var(--text-2);font-size:13px;line-height:1.5}.card{background:var(--card);border-radius:var(--radius);padding:16px;margin-bottom:12px;box-shadow:var(--shadow)}.section-title{font-size:16.5px;font-weight:700;margin:22px 0 12px;display:flex;align-items:center;gap:8px;letter-spacing:.3px}.section-title:before{content:"";width:4px;height:16px;border-radius:2px;background:linear-gradient(180deg,var(--primary),var(--primary-2));flex-shrink:0}.section-title .badge{font-size:12px;font-weight:600;background:var(--danger);color:#fff;border-radius:999px;padding:1px 9px;font-variant-numeric:tabular-nums}.btn{display:flex;align-items:center;justify-content:center;width:100%;min-height:48px;border:none;border-radius:var(--radius-sm);padding:12px 16px;font-size:16px;font-weight:600;letter-spacing:.5px;cursor:pointer;text-align:center;text-decoration:none;transition:transform .12s ease,opacity .15s ease,box-shadow .15s ease;user-select:none;-webkit-user-select:none}.btn:active{transform:scale(.98);opacity:.9}.btn-primary{background:linear-gradient(135deg,#6366f1,var(--primary-2));color:#fff;box-shadow:0 4px 14px #6366f152}.btn-outline{background:#fff;color:var(--primary);border:1.5px solid #c7d2fe}.btn-ghost{background:transparent;color:var(--text-2);font-weight:500}.btn+.btn{margin-top:10px}.btn:disabled{opacity:.45;box-shadow:none;cursor:not-allowed}.tag{display:inline-block;font-size:12px;padding:3px 10px;border-radius:999px;background:var(--primary-light);color:var(--primary);font-weight:600;white-space:nowrap}.notice{border-radius:var(--radius);padding:14px 16px;margin-bottom:12px;font-size:14px;line-height:1.6;box-shadow:var(--shadow)}.notice-warn{background:var(--warning-bg);border:1px solid #fed7aa}.notice-amber{background:var(--amber-bg);border:1px solid #fde68a}.notice-info{background:var(--primary-light);border:1px solid #e0e7ff}.lesson-item{display:flex;align-items:center;gap:12px;padding:15px 16px;background:var(--card);border-radius:var(--radius);margin-bottom:10px;text-decoration:none;color:inherit;box-shadow:var(--shadow);transition:transform .12s ease}.lesson-item:active{transform:scale(.98)}.lesson-item .dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.lesson-item .info{flex:1;min-width:0}.lesson-item .title{font-size:15px;font-weight:600;line-height:1.45;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lesson-item .sub{font-size:12.5px;color:var(--text-2);margin-top:3px;line-height:1.4}.lesson-item .arrow{color:#c3c9d6;font-size:20px;font-weight:300}.lesson-item.done{opacity:.7}.status-icon{font-size:18px;flex-shrink:0}.stat-strip{display:flex;text-align:center;padding:18px 8px}.stat-strip .cell{flex:1}.stat-strip .cell+.cell{border-left:1px solid var(--border)}.progress{height:8px;background:#eef0f5;border-radius:999px;overflow:hidden}.progress>i{display:block;height:100%;border-radius:999px;background:var(--primary);transition:width .3s ease}pre.code{background:#1e293b;color:#e2e8f0;border-radius:var(--radius-sm);padding:14px;font-size:12.5px;line-height:1.65;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:12px 0 4px;font-family:Cascadia Code,JetBrains Mono,Consolas,Courier New,monospace;white-space:pre}.lesson-head{margin:4px 0 16px}.lesson-head h2{font-size:21px;line-height:1.4;margin:10px 0 6px;letter-spacing:.3px}.reading h3{font-size:16px;margin-bottom:10px;display:flex;align-items:center;gap:8px}.reading h3:before{content:"";width:4px;height:15px;border-radius:2px;background:linear-gradient(180deg,var(--primary),var(--primary-2));flex-shrink:0}.reading p{font-size:15.5px;line-height:1.85;color:#374151;margin-bottom:10px}.app-header{position:sticky;top:0;z-index:20;background:linear-gradient(135deg,#6366f1 0%,var(--primary-2) 100%);color:#fff;padding:16px;padding-top:calc(16px + env(safe-area-inset-top));box-shadow:0 2px 12px #6366f140}.app-header h1{font-size:19px;font-weight:700;letter-spacing:.5px}.app-header .sub{font-size:12.5px;opacity:.88;margin-top:3px}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:520px;height:calc(var(--nav-h) + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#ffffffeb;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--border);display:flex;z-index:30}.bottom-nav a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;text-decoration:none;color:#9aa1b0;font-size:11px;position:relative;user-select:none;-webkit-user-select:none}.bottom-nav a .icon-wrap{padding:2px 14px;border-radius:999px;transition:background .2s ease;line-height:1.3}.bottom-nav a .icon{font-size:20px}.bottom-nav a.active{color:var(--primary);font-weight:600}.bottom-nav a.active .icon-wrap{background:var(--primary-light)}.bottom-nav .nav-badge{position:absolute;top:5px;left:calc(50% + 8px);background:var(--danger);color:#fff;font-size:10px;min-width:16px;height:16px;border-radius:999px;display:flex;align-items:center;justify-content:center;padding:0 4px;font-weight:600;font-variant-numeric:tabular-nums}.quiz-meta{display:flex;align-items:center;gap:8px;margin-bottom:12px;flex-wrap:wrap}.quiz-question{font-size:16.5px;font-weight:600;line-height:1.6;margin-bottom:16px}.quiz-option{display:block;width:100%;text-align:left;background:#fff;border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:14px;font-size:15px;line-height:1.55;margin-bottom:10px;cursor:pointer;transition:border-color .15s ease,background .15s ease,transform .1s ease;user-select:none;-webkit-user-select:none}.quiz-option:active{transform:scale(.99)}.quiz-option.selected{border-color:var(--primary);background:var(--primary-light)}.quiz-option.correct{border-color:var(--success);background:var(--success-bg)}.quiz-option.wrong{border-color:var(--danger);background:var(--danger-bg)}.explain{border-radius:var(--radius-sm);padding:12px 14px;font-size:14px;line-height:1.65;margin:14px 0 2px;animation:fadeUp .2s ease}.explain.ok{background:var(--success-bg);border:1px solid #bbf7d0}.explain.no{background:var(--danger-bg);border:1px solid #fecaca}.result-card{text-align:center;padding:32px 20px}.result-card .emoji{font-size:48px;line-height:1.2}.result-card h3{font-size:18px;margin:10px 0 6px}.result-card .actions{margin-top:20px}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.stat-cell{background:var(--card);border-radius:var(--radius);padding:16px 12px;text-align:center;box-shadow:var(--shadow)}.stat-cell .num{font-size:26px;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--primary-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;font-variant-numeric:tabular-nums}.stat-cell .label{font-size:12px;color:var(--text-2);margin-top:3px}.bar-chart{display:flex;align-items:flex-end;gap:8px;height:90px;padding:0 4px}.bar-chart .bar{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;height:100%;justify-content:flex-end}.bar-chart .bar i{width:100%;max-width:28px;background:linear-gradient(180deg,#818cf8,var(--primary));border-radius:6px 6px 0 0;min-height:3px;display:block}.bar-chart .bar span{font-size:10px;color:var(--text-2)}.cal{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;text-align:center}.cal .hd{font-size:11px;color:var(--text-2);padding:2px 0}.cal .cell{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:10px;font-size:12px;background:#f3f4f6;color:var(--text-2);font-variant-numeric:tabular-nums}.cal .done{background:#dcfce7;color:#166534;font-weight:700}.cal .miss{background:#fee2e2;color:#b91c1c}.cal .future{background:transparent;color:#d1d5db}.input{width:100%;padding:13px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:16px;margin-bottom:10px;background:#fff;outline:none;transition:border-color .15s ease}.input:focus{border-color:var(--primary)}.empty{text-align:center;color:var(--text-2);padding:28px 0;font-size:14px}.row-item{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 0;border-bottom:1px solid var(--border);font-size:14px;text-decoration:none;color:inherit}.row-item:last-child{border-bottom:none}.module-card{display:block;text-decoration:none;color:inherit;transition:transform .12s ease}.module-card:active{transform:scale(.99)}.mc-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px}@media(min-width:560px){body{background:#e8eaf2}#app{box-shadow:0 0 32px #1018281a}}