:root{--bg: #f6faf9;--surface: #fff;--mint-50: #eaf7f3;--mint-100: #d5f0e8;--primary: #14a38b;--primary-strong: #0e8a74;--primary-soft: #e7f6f2;--primary-ring: #14a38b33;--ink: #1e293b;--text: #334155;--muted: #64748b;--faint: #94a3b8;--line: #e3ebe8;--line-strong: #cfdcd8;--accent: #f59e0b;--accent-soft: #fef6e7;--accent-ink: #b45309;--danger: #e5484d;--danger-soft: #fff1f1;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--shadow-sm: 0 1px 2px #0f3d3414, 0 1px 3px #0f3d340d;--shadow-md: 0 6px 20px #0f3d3414, 0 2px 6px #0f3d340a;--shadow-lg: 0 18px 48px #0f3d341f, 0 4px 12px #0f3d340d;--blue: var(--primary);--border: var(--line);--orange: var(--accent);--green: #3b82f6;font-family:PingFang SC,Microsoft YaHei,Noto Sans CJK SC,system-ui,sans-serif;color:var(--text);background:var(--bg);font-synthesis:none;font-weight:400;line-height:1.5;-webkit-font-smoothing:antialiased}.tone-math{--tone: #3b82f6;--tone-soft: #eaf2ff}.tone-physics{--tone: #8b5cf6;--tone-soft: #f2edff}.tone-chemistry{--tone: #f97316;--tone-soft: #fff1e6}.tone-biology{--tone: #22a55b;--tone-soft: #e8f7ee}.tone-geography{--tone: #0ea5e9;--tone-soft: #e6f6fd}.tone-chinese{--tone: #e11d48;--tone-soft: #fdebef}.tone-english{--tone: #6366f1;--tone-soft: #eef0ff}.tone-history{--tone: #b45309;--tone-soft: #fbf1e3}.tone-politics{--tone: #dc2626;--tone-soft: #fdeceb}.tone-science{--tone: #0d9488;--tone-soft: #e5f6f4}.tone-nature{--tone: #65a30d;--tone-soft: #f0f7e4}.tone-free{--tone: var(--primary-strong);--tone-soft: var(--primary-soft)}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button{cursor:pointer;border:0;background:none;color:inherit;display:inline-flex;align-items:center;justify-content:center;gap:8px}button:disabled{cursor:not-allowed;opacity:.45}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--primary-ring);outline-offset:2px}input,textarea,select{outline:none;border:1px solid var(--line-strong);border-radius:var(--radius-sm);color:var(--ink);background:var(--surface);transition:border-color .15s,box-shadow .15s}input:focus,textarea:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-ring)}input,select{padding:9px 11px;min-width:0}select{cursor:pointer}textarea{resize:vertical;line-height:1.75}textarea::placeholder,input::placeholder{color:var(--faint)}button:hover{color:var(--primary-strong)}a{color:inherit;text-decoration:none}h1,h2,h3,p{margin:0}input[type=range]{width:100%;height:6px;padding:0;border:0;box-shadow:none;border-radius:8px;accent-color:var(--primary);cursor:pointer;display:block;margin:10px 0}input[type=color]{height:36px;padding:4px;cursor:pointer}input[type=checkbox]{accent-color:var(--primary)}progress{accent-color:var(--primary)}.primary{background:var(--primary);color:#fff;border-radius:var(--radius-md);font-weight:600;box-shadow:0 4px 12px #14a38b33;transition:background .15s,transform .15s,box-shadow .15s}.primary:hover{background:var(--primary-strong);color:#fff;transform:translateY(-1px);box-shadow:0 6px 16px #14a38b40}.primary:disabled:hover{transform:none;background:var(--primary)}.secondary{border:1px solid var(--line-strong);border-radius:10px;padding:9px 14px;font-size:14px;background:var(--surface);color:var(--text);transition:border-color .15s,background .15s}.secondary:hover{border-color:var(--primary);background:var(--primary-soft);color:var(--primary-strong)}.text-button{font-size:14px;color:var(--primary-strong);padding:6px 2px;font-weight:500}.text-button:hover{color:var(--primary);text-decoration:underline;text-underline-offset:3px}.icon-btn{padding:8px;border-radius:10px;flex-shrink:0;color:var(--muted);transition:background .15s,color .15s}.icon-btn:hover{background:var(--primary-soft);color:var(--primary-strong)}.icon-btn.selected{color:var(--primary-strong);background:var(--mint-100)}.icon-btn.small{padding:4px;border-radius:7px}.full{width:100%}.muted{color:var(--faint);font-size:12px}.eyebrow{font-size:12px;letter-spacing:1px;color:var(--primary-strong);font-weight:600}.status-dot{width:8px;height:8px;border-radius:50%;background:var(--primary);display:inline-block;flex-shrink:0;box-shadow:0 0 0 3px var(--primary-soft)}.pending{background:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.subject-tag{display:inline-flex;align-items:center;font-size:12px;font-weight:600;line-height:1;padding:4px 9px;border-radius:999px;color:var(--tone, var(--primary-strong));background:var(--tone-soft, var(--primary-soft));white-space:nowrap}.subject-chip{font-size:13px;padding:6px 13px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--text);white-space:nowrap;transition:background .15s,border-color .15s,color .15s}.subject-chip:hover{border-color:var(--tone);color:var(--tone);background:var(--tone-soft)}.subject-chip.active{background:var(--tone);border-color:var(--tone);color:#fff;font-weight:600}.section-row{display:flex;justify-content:space-between;align-items:center;gap:10px}.section-row h3{font-size:14px;font-weight:600;color:var(--ink)}.section-row>button{font-size:13px;white-space:nowrap;flex-shrink:0}.checkbox-label{display:flex!important;align-items:center;gap:8px;font-size:14px!important;cursor:pointer;color:var(--text)}.checkbox-label input{accent-color:var(--primary);width:auto}.field-note{font-size:12px!important;line-height:1.8;color:var(--muted);margin:14px 0}.two-fields{display:flex;gap:10px}.two-fields>label{flex:1;min-width:0}.two-fields input{width:100%}.spin{animation:spin 1s linear infinite}.app{height:100dvh;min-height:600px;display:flex;flex-direction:column;overflow:hidden;background:var(--bg)}.topbar{height:64px;flex-shrink:0;padding:0 24px;background:var(--surface);display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);z-index:3}.brand{display:flex;gap:10px;align-items:center;min-width:0}.brand-mark{height:36px;width:36px;background:linear-gradient(135deg,#1bbc9f,var(--primary-strong));border-radius:11px;display:grid;place-items:center;box-shadow:0 4px 10px #14a38b33;flex-shrink:0}.brand-mark svg{width:26px;fill:none;stroke:#fff;stroke-width:1.6}.brand-name{display:flex;align-items:baseline;font-size:21px;font-weight:700;color:var(--ink);letter-spacing:1px;white-space:nowrap}.brand-sub{font-size:13px;color:var(--muted);letter-spacing:.5px;font-weight:400;margin-left:12px;border-left:1px solid var(--line);padding-left:12px}.topnav{display:flex;align-items:center;gap:4px;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:4px}.topnav button{font-size:14px;color:var(--muted);padding:7px 16px;border-radius:999px;white-space:nowrap;transition:background .15s,color .15s}.topnav button:hover{color:var(--ink)}.topnav button.active{color:var(--primary-strong);background:var(--surface);font-weight:600;box-shadow:var(--shadow-sm)}.topnav button span{background:var(--mint-100);color:var(--primary-strong);border-radius:999px;font-size:12px;line-height:1;padding:3px 7px;font-weight:600}.top-actions{display:flex;align-items:center;gap:12px}.save-status{color:var(--muted);font-size:13px;display:flex;align-items:center;gap:8px;white-space:nowrap}.new-button{padding:9px 16px;font-size:14px;white-space:nowrap}.avatar{display:grid;place-items:center;background:var(--accent-soft);color:var(--accent-ink);font-size:14px;font-weight:600;width:34px;height:34px;border-radius:50%;flex-shrink:0}.mobile-tabs{display:none}.home{flex:1;min-height:0;overflow-y:auto;background:radial-gradient(1100px 420px at 50% -120px,var(--mint-100),transparent 70%),var(--bg);padding:48px 24px 32px;scrollbar-color:var(--line-strong) transparent}.home-hero{max-width:880px;margin:0 auto;text-align:center}.home-badge{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--primary-strong);background:var(--surface);border:1px solid var(--mint-100);border-radius:999px;padding:5px 14px;box-shadow:var(--shadow-sm)}.home-hero h1{margin-top:18px;font-size:36px;line-height:1.3;font-weight:700;color:var(--ink);letter-spacing:1px}.home-hero>p{margin:12px auto 28px;max-width:680px;font-size:16px;line-height:1.8;color:var(--muted)}.home-hero .input-form{text-align:left}.home-steps{list-style:none;padding:0;margin:28px auto 0;max-width:880px;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.home-steps li{display:flex;align-items:center;gap:12px;padding:14px 16px;background:#ffffffb3;border:1px solid var(--line);border-radius:var(--radius-lg)}.home-steps li>svg{flex-shrink:0;width:38px;height:38px;padding:9px;border-radius:12px;color:var(--primary-strong);background:var(--primary-soft)}.home-steps strong{display:block;font-size:15px;color:var(--ink)}.home-steps small{display:block;font-size:13px;color:var(--muted);margin-top:2px}.home-section{max-width:1120px;margin:48px auto 0}.home-section-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.home-section-head h2{font-size:22px;font-weight:700;color:var(--ink)}.home-section-head .text-button{display:inline-flex;gap:4px}.home-section-note{font-size:14px;color:var(--muted);margin-top:6px}.home-section-head+.recent-grid{margin-top:16px}.subject-filter{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 18px}.home-footer{text-align:center;font-size:13px;color:var(--faint);margin:56px auto 0}.example-grid,.recent-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}.project-thumb{display:grid;place-items:center;width:100%;aspect-ratio:16 / 10;background:var(--surface);border-bottom:1px solid var(--line);color:var(--faint);overflow:hidden}.project-thumb img{width:100%;height:100%;object-fit:contain;padding:8px;transition:transform .25s}.thumb-loading{width:60%;height:50%;border-radius:10px;background:linear-gradient(90deg,var(--mint-50),var(--mint-100),var(--mint-50));background-size:200% 100%;animation:shimmer 1.4s linear infinite}.example-card,.recent-card>.recent-open{width:100%;min-width:0;flex-direction:column;align-items:stretch;gap:0;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s,border-color .2s}.example-card:hover,.recent-card>.recent-open:hover{color:inherit;transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--mint-100)}.example-card:hover .project-thumb img,.recent-card>.recent-open:hover .project-thumb img{transform:scale(1.03)}.card-body{display:flex;flex-direction:column;align-items:flex-start;gap:8px;padding:14px 16px 16px;min-width:0}.card-body strong{font-size:15px;font-weight:600;color:var(--ink);line-height:1.45}.card-body strong em{font-style:normal;font-weight:400;color:var(--muted)}.card-body small{font-size:13px;line-height:1.65;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.recent-card{position:relative;min-width:0}.recent-card .card-body strong{width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.recent-card .card-body small{display:flex;align-items:center;gap:8px;font-size:12px}.remove-project{position:absolute;top:8px;right:8px;background:#ffffffe6;box-shadow:var(--shadow-sm);opacity:0;transition:opacity .15s}.recent-card:hover .remove-project,.remove-project:focus-visible{opacity:1}.remove-project:hover{color:var(--danger);background:var(--danger-soft)}.empty-library{display:flex;flex-direction:column;align-items:center;gap:8px;padding:48px 16px;border:1px dashed var(--line-strong);border-radius:var(--radius-lg);color:var(--muted);font-size:14px;text-align:center}.empty-library svg{color:var(--primary)}.empty-library strong{font-size:16px;color:var(--ink)}.input-form{display:flex;flex-direction:column}.prompt-card{background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--radius-md);padding:12px;transition:border-color .15s,box-shadow .15s,background .15s}.prompt-card:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-ring)}.input-form.drag-over .prompt-card{border-color:var(--primary);border-style:dashed;background:var(--primary-soft)}.input-label{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px;font-size:14px;font-weight:600;color:var(--ink)}.input-label span{font-size:12px;font-weight:400;color:var(--faint);font-variant-numeric:tabular-nums}#prompt{padding:4px 0;width:100%;min-height:132px;font-size:14px;flex-shrink:0;border:0;background:transparent;box-shadow:none;resize:vertical;color:var(--ink)}.material-list{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.material{display:flex;align-items:center;max-width:100%;border:1px solid var(--mint-100);background:var(--primary-soft);border-radius:999px;padding:2px 4px 2px 10px}.material>button:first-child{min-width:0;justify-content:flex-start;font-size:13px;color:var(--primary-strong);gap:6px;padding:3px 0}.material span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:180px}.material svg{flex-shrink:0}.upload-zone{display:flex;align-items:center;flex-wrap:wrap;gap:6px 10px;margin-top:10px;padding-top:10px;border-top:1px dashed var(--line)}.attach-button{font-size:13px;font-weight:500;color:var(--primary-strong);background:var(--primary-soft);border-radius:999px;padding:6px 13px;gap:6px}.attach-button:hover{background:var(--mint-100)}.upload-hint{font-size:12px;color:var(--faint)}.page-input{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted);margin-top:8px}.page-input label{white-space:nowrap}.page-input input{padding:6px 10px;font-size:13px;flex:1;border-color:var(--line);background:var(--bg)}.input-options{display:flex;flex-direction:column;gap:14px;margin:16px 0}.field-label{display:block;font-size:13px;font-weight:600;color:var(--ink);margin-bottom:8px}.subject-chips{display:flex;flex-wrap:wrap;gap:6px}.grade-field{display:block;min-width:0}.grade-field select{width:100%;font-size:14px;padding:8px 10px}.generate-row{display:flex;flex-direction:column;align-items:stretch;gap:4px}.generate{width:100%;padding:13px 16px;font-size:15px;flex-shrink:0}.generate svg:last-child{margin-left:2px}.cancel{align-self:center}.resume{width:100%;padding:11px 14px;font-size:14px;margin-top:10px}.input-note{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;color:var(--muted);font-size:12px;margin-top:12px;text-align:center}.input-note p{line-height:1.6}.input-note .status-dot{width:6px;height:6px;box-shadow:none}.input-form.hero{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);padding:20px}.input-form.hero .prompt-card{border-color:var(--line);background:var(--bg);border-radius:var(--radius-lg);padding:16px 18px 12px}.input-form.hero .prompt-card:focus-within{background:var(--surface)}.input-form.hero .input-label{font-size:15px}.input-form.hero #prompt{min-height:128px;font-size:16px}.input-form.hero .input-options{flex-direction:row;align-items:flex-start;gap:20px;margin:18px 4px}.input-form.hero .subject-field{flex:1;min-width:0}.input-form.hero .grade-field{width:160px;flex-shrink:0}.input-form.hero .generate-row{flex-direction:row;justify-content:center;align-items:center;gap:16px}.input-form.hero .generate{width:auto;min-width:260px;padding:14px 32px;font-size:16px;border-radius:14px}.input-form.hero .cancel{align-self:auto}.input-form.hero .resume{max-width:420px;align-self:center}.workspace{display:grid;grid-template-columns:64px minmax(0,1fr) 300px;flex:1;min-height:0;width:100%;max-width:2200px;margin:0 auto}.workspace.input-open{grid-template-columns:320px minmax(0,1fr) 300px}.input-panel{background:var(--surface);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;overflow:hidden}.input-rail{display:flex;flex-direction:column;align-items:center;gap:12px;padding:16px 0}.rail-label{writing-mode:vertical-rl;letter-spacing:4px;font-size:14px;font-weight:600;padding:14px 9px;border-radius:12px;color:var(--primary-strong);background:var(--primary-soft);transition:background .15s}.rail-label:hover{background:var(--mint-100)}.input-panel-body{display:flex;flex-direction:column;flex:1;min-height:0;overflow-y:auto;padding:22px 20px 16px;scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent}.input-panel.open .input-rail,.input-panel.collapsed .input-panel-body{display:none}.panel-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:8px}.panel-heading h1{font-size:22px;font-weight:700;color:var(--ink);margin-top:6px;line-height:1.35}.panel-description{font-size:13px;color:var(--muted);line-height:1.7;margin:6px 0 16px}.examples-link{margin-top:16px;width:100%}.left-footer{display:flex;align-items:center;justify-content:center;gap:7px;color:var(--faint);font-size:12px;margin-top:auto;padding-top:20px}.canvas-panel{position:relative;display:flex;min-width:0;flex-direction:column;min-height:0;background:var(--bg)}.canvas-header{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;gap:14px;flex-shrink:0}.document-title{display:flex;align-items:center;gap:12px;min-width:0}.document-icon{height:40px;width:40px;display:grid;place-items:center;color:var(--tone, var(--primary-strong));background:var(--tone-soft, var(--primary-soft));border-radius:12px;flex-shrink:0}.document-title>div{min-width:0}.document-title h2{font-size:16px;font-weight:700;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:40vw}.document-title div>span{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:8px;margin-top:4px;white-space:nowrap}.document-title .subject-tag{padding:3px 8px}.canvas-header-actions{display:flex;align-items:center;gap:8px}.revise-trigger{display:inline-flex;align-items:center;gap:6px;padding:9px 16px;border:1px solid var(--mint-100);border-radius:var(--radius-md);background:var(--primary-soft);color:var(--primary-strong);font:inherit;font-size:14px;font-weight:600;cursor:pointer;white-space:nowrap}.revise-trigger:hover,.revise-trigger.active{background:var(--primary);border-color:var(--primary);color:#fff}.export-btn{padding:9px 16px;background:var(--surface);border:1px solid var(--line-strong);border-radius:10px;font-size:14px;font-weight:500;color:var(--primary-strong);gap:6px;box-shadow:var(--shadow-sm)}.export-btn:hover{border-color:var(--primary);background:var(--primary-soft)}.canvas-tools{display:flex;justify-content:space-between;align-items:center;margin:0 16px 8px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:4px 8px;box-shadow:var(--shadow-sm);flex-shrink:0}.tool-group,.zoom-controls{display:flex;align-items:center;gap:2px}.tool-divider{width:1px;height:20px;background:var(--line);margin:0 6px}.zoom-controls{font-size:13px;color:var(--muted)}.zoom-controls>span{min-width:44px;text-align:center;font-variant-numeric:tabular-nums}.canvas-stage{flex:1;min-height:200px;position:relative;overflow:hidden;margin:0 16px;display:flex;align-items:center;justify-content:center;background-color:#eef5f3;background-image:radial-gradient(#cfe3dd 1px,transparent 1px);background-size:18px 18px;border:1px solid var(--line);border-radius:var(--radius-lg);padding:50px 12px 32px}.paper{background:#fff;box-shadow:var(--shadow-md);border-radius:4px;position:relative;transform-origin:center;flex-shrink:0;transition:box-shadow 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10px;border-radius:999px;background:var(--primary-soft);color:var(--primary-strong);font-size:12px;white-space:nowrap}.refine-chip .text-button{font-size:12px;padding:2px 8px}.upgrade-notice{width:100%;box-sizing:border-box;display:flex;flex-wrap:wrap;align-items:center;gap:10px 12px;padding:10px 12px 10px 14px;background:var(--surface);border:1px solid var(--mint-100);border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}.upgrade-icon{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--primary-soft);color:var(--primary);flex-shrink:0}.upgrade-text{flex:1 1 220px;display:flex;flex-direction:column;gap:2px;min-width:0}.upgrade-text strong{font-size:14px;color:var(--ink)}.upgrade-text span{font-size:12px;color:var(--muted);line-height:1.5}.upgrade-text em,.modal-description em{display:block;font-style:normal;color:var(--accent-ink)}.upgrade-actions{display:flex;align-items:center;gap:8px;margin-left:auto}.upgrade-actions 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