:root{--primary: #4f46e5;--primary-weak: #eef2ff;--primary-text: #3730a3;--bg: #f5f6fa;--surface: #ffffff;--surface-2: #f0f1f7;--text: #1c1e26;--text-2: #6b7280;--text-3: #9ca3af;--line: #e5e7eb;--ok: #059669;--ok-weak: #ecfdf5;--warn: #d97706;--warn-weak: #fffbeb;--bad: #dc2626;--bad-weak: #fef2f2;--radius: 14px;--shadow: 0 1px 3px rgba(16, 18, 27, .06), 0 4px 14px rgba(16, 18, 27, .05);--nav-h: 62px;--safe-bottom: env(safe-area-inset-bottom, 0px)}@media (prefers-color-scheme: dark){:root[data-theme=auto]{--primary: #818cf8;--primary-weak: #232343;--primary-text: #c7d2fe;--bg: #101216;--surface: #1a1d25;--surface-2: #232733;--text: #e8eaf1;--text-2: #9aa1ad;--text-3: #6b7280;--line: #2c313d;--ok: #34d399;--ok-weak: #10281f;--warn: #fbbf24;--warn-weak: #2d2410;--bad: #f87171;--bad-weak: #331a1a;--shadow: 0 1px 3px rgba(0,0,0,.4)}}:root[data-theme=dark]{--primary: #818cf8;--primary-weak: #232343;--primary-text: #c7d2fe;--bg: #101216;--surface: #1a1d25;--surface-2: #232733;--text: #e8eaf1;--text-2: #9aa1ad;--text-3: #6b7280;--line: #2c313d;--ok: #34d399;--ok-weak: #10281f;--warn: #fbbf24;--warn-weak: #2d2410;--bad: #f87171;--bad-weak: #331a1a;--shadow: 0 1px 3px rgba(0,0,0,.4)}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Segoe UI,sans-serif;font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}button{font-family:inherit}input,textarea,select{font-family:inherit;color:var(--text)}#root{min-height:100vh}.app-shell{max-width:780px;margin:0 auto;padding:0 16px calc(var(--nav-h) + var(--safe-bottom) + 16px);min-height:100vh}.page-header{padding:20px 2px 8px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.page-header h1{font-size:24px;margin:0;letter-spacing:.5px}.page-header .sub{color:var(--text-2);font-size:14px;margin-top:2px}.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:50;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border-top:1px solid var(--line);display:flex;justify-content:center;gap:4px;padding:6px 8px calc(6px + var(--safe-bottom));padding-bottom:calc(6px + var(--safe-bottom))}.tabbar .tab{flex:1;max-width:96px;display:flex;flex-direction:column;align-items:center;gap:2px;border:none;background:none;color:var(--text-3);font-size:11.5px;cursor:pointer;padding:5px 0 3px;border-radius:10px}.tabbar .tab .ico{font-size:21px;line-height:1}.tabbar .tab.active{color:var(--primary);font-weight:600}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin:12px 0}.card h3{margin:0 0 10px;font-size:16px}.row{display:flex;align-items:center;gap:10px}.row.between{justify-content:space-between}.wrap{flex-wrap:wrap}.grow{flex:1;min-width:0}.muted{color:var(--text-2);font-size:13.5px}.tiny{color:var(--text-3);font-size:12px}.ellipsis{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;cursor:pointer;border-radius:12px;font-size:15px;font-weight:500;padding:10px 18px;background:var(--primary);color:#fff;transition:transform .06s,opacity .15s;-webkit-user-select:none;user-select:none}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.45;cursor:default}.btn.sec{background:var(--surface-2);color:var(--text)}.btn.ghost{background:transparent;color:var(--primary);border:1.5px solid var(--primary)}.btn.danger{background:var(--bad)}.btn.danger-ghost{background:transparent;color:var(--bad);border:1.5px solid var(--bad)}.btn.sm{font-size:13px;padding:6px 12px;border-radius:9px}.btn.lg{width:100%;padding:13px;font-size:16.5px;border-radius:14px}.btn.icon{padding:8px;border-radius:10px;background:var(--surface-2);color:var(--text);font-size:16px}.tag{display:inline-flex;align-items:center;padding:2px 9px;border-radius:999px;font-size:12px;font-weight:500;background:var(--primary-weak);color:var(--primary-text);white-space:nowrap}.tag.ok{background:var(--ok-weak);color:var(--ok)}.tag.warn{background:var(--warn-weak);color:var(--warn)}.tag.bad{background:var(--bad-weak);color:var(--bad)}.tag.gray{background:var(--surface-2);color:var(--text-2)}.input,textarea.input,select.input{width:100%;background:var(--surface-2);border:1.5px solid transparent;border-radius:12px;padding:10px 13px;font-size:15.5px;outline:none;transition:border .15s}.input:focus{border-color:var(--primary)}textarea.input{resize:vertical;min-height:120px;line-height:1.7}.field{margin:10px 0}.field label{display:block;font-size:13.5px;color:var(--text-2);margin-bottom:5px}.progress{height:7px;border-radius:999px;background:var(--surface-2);overflow:hidden}.progress>div{height:100%;border-radius:999px;background:var(--primary);transition:width .3s}.list-row{display:flex;align-items:center;gap:12px;padding:13px 4px;border-bottom:1px solid var(--line);cursor:pointer}.list-row:last-child{border-bottom:none}.dot{width:10px;height:10px;border-radius:50%;flex:none}.empty{text-align:center;color:var(--text-3);padding:34px 16px;font-size:14.5px}.empty .big{font-size:40px;margin-bottom:8px}.cloze-text{font-size:17.5px;line-height:2.15;letter-spacing:.3px}.cloze-text .blank-box{display:inline-block;min-width:3.2em;text-align:center;border-radius:8px;padding:0 8px;margin:0 2px;background:var(--primary-weak);color:var(--primary-text);font-size:13.5px;cursor:pointer;vertical-align:baseline;border:1.5px dashed color-mix(in srgb,var(--primary) 45%,transparent)}.cloze-text .blank-box.peek{background:var(--warn-weak);color:var(--warn);border-style:solid;border-color:var(--warn)}.cloze-text .blank-box.shown{background:var(--ok-weak);color:var(--ok);border:1.5px solid var(--ok);cursor:default;font-size:16px;font-weight:600}.blank-input{display:inline-block;border:none;border-bottom:2px solid var(--primary);background:transparent;outline:none;text-align:center;font-size:16.5px;padding:0 4px;margin:0 2px;min-width:3.5em;color:var(--text);border-radius:6px 6px 0 0;vertical-align:baseline}.blank-input:focus{background:var(--primary-weak)}.blank-input.ok{border-color:var(--ok);background:var(--ok-weak)}.blank-input.partial{border-color:var(--warn);background:var(--warn-weak)}.blank-input.bad{border-color:var(--bad);background:var(--bad-weak)}.diff{font-size:15.5px;line-height:1.9}.diff .m-match{color:var(--ok);font-weight:600}.diff .m-missing{color:var(--bad);background:var(--bad-weak);border-radius:4px;padding:0 2px;text-decoration:line-through}.diff .m-extra{color:var(--text-3);text-decoration:line-through;font-size:13px}.stage-steps{display:flex;gap:6px;margin:10px 0 2px}.stage-steps .st{flex:1;height:5px;border-radius:999px;background:var(--surface-2)}.stage-steps .st.on{background:var(--primary)}.heatmap{display:grid;grid-auto-flow:column;grid-template-rows:repeat(7,11px);gap:3px;overflow-x:auto;padding:4px 0}.heatmap .cell{width:11px;height:11px;border-radius:3px;background:var(--surface-2)}.heatmap .cell.l1{background:color-mix(in srgb,var(--primary) 30%,var(--surface))}.heatmap .cell.l2{background:color-mix(in srgb,var(--primary) 55%,var(--surface))}.heatmap .cell.l3{background:color-mix(in srgb,var(--primary) 80%,var(--surface))}.heatmap .cell.l4{background:var(--primary)}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a0c1473;z-index:90;display:flex;align-items:flex-end;justify-content:center;animation:fadein .15s}@media (min-width: 640px){.modal-mask{align-items:center}}.modal{background:var(--surface);width:100%;max-width:560px;max-height:86vh;overflow:auto;border-radius:18px 18px 0 0;padding:20px 18px calc(20px + var(--safe-bottom))}@media (min-width: 640px){.modal{border-radius:18px;padding-bottom:20px}}@keyframes fadein{0%{opacity:0}to{opacity:1}}.modal h3{margin:0 0 14px}.tree-chapter{margin:10px 0}.tree-head{display:flex;align-items:center;gap:8px;padding:10px 12px;background:var(--surface-2);border-radius:11px;cursor:pointer}.tree-points{padding:2px 6px 0 18px}.toast{position:fixed;left:50%;bottom:calc(84px + var(--safe-bottom));transform:translate(-50%);background:#26282f;color:#fff;padding:9px 20px;border-radius:999px;font-size:14px;z-index:99;animation:fadein .2s;max-width:86vw;text-align:center}