:root{--bg-primary:#fafaf8;--bg-secondary:#f5f4ef;--bg-panel:#ffffff;--text-primary:#1a1a1a;--text-secondary:#6b6b6b;--text-tertiary:#9ca3af;--accent:#d97706;--accent-hover:#b45309;--accent-light:#fef3c7;--success-bg:#f0fdf4;--success-text:#15803d;--warning-bg:#fffbeb;--error:#dc2626;--border:#e5e5e3;--border-strong:#d1d0cb;--user-bubble-bg:#1a1a1a;--user-bubble-text:#ffffff;--ai-bubble-bg:#f5f4ef;--ai-bubble-text:#1a1a1a;--shadow:0 1px 3px rgba(0,0,0,0.05);--shadow-hover:0 12px 30px rgba(26,26,26,0.08);--navbar-height:56px;--footer-height:34px}*{box-sizing:border-box}body,html{min-height:100%;margin:0;background:var(--bg-primary);color:var(--text-primary)}body{display:flex;flex-direction:column;min-height:100dvh;font-family:-apple-system,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans SC,sans-serif;font-size:15px;line-height:1.7}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button{letter-spacing:0}.navbar{position:-webkit-sticky;position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;flex:0 0 var(--navbar-height);height:var(--navbar-height);padding:0 28px;border-bottom:1px solid var(--border);background:rgba(250,250,248,.9);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.brand,.btn,.feature-action,.history-toggle,.icon-text-button,.nav-link,.pdf-controls,.pdf-topbar{display:inline-flex;align-items:center;gap:8px}.brand{font-size:18px;font-weight:700}.brand-logo{width:28px;height:28px;border-radius:6px;object-fit:cover}.nav-links{display:flex;align-items:center;gap:8px}.nav-link{min-height:36px;padding:7px 12px;border-radius:8px;color:var(--text-secondary);font-size:14px;transition:background .15s ease,color .15s ease}.nav-link.active,.nav-link:hover{background:var(--bg-secondary);color:var(--text-primary)}.footer{display:flex;align-items:center;justify-content:center;flex:0 0 var(--footer-height);gap:12px;min-height:var(--footer-height);padding:3px 16px;border-top:1px solid var(--border);color:var(--text-secondary);font-size:12px;line-height:1.25}.footer a{color:var(--accent-hover);font-weight:600}.home-page{min-height:calc(100dvh - var(--navbar-height) - var(--footer-height));display:grid;place-items:center;padding:40px 24px}.home-hero{width:min(920px,100%)}.hero-copy{text-align:center;margin-bottom:34px}.hero-copy h1{margin:0;font-size:28px;line-height:1.3;font-weight:650}.hero-copy p{margin:12px 0 0;color:var(--text-secondary)}.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:18px;gap:18px}.feature-card{display:grid;align-content:start;min-height:250px;padding:24px;border:1px solid var(--border);border-radius:8px;background:var(--bg-panel);box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}.feature-card:hover{transform:translateY(-2px);border-color:var(--border-strong);box-shadow:var(--shadow-hover)}.feature-card.highlighted{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light),var(--shadow)}.feature-icon{display:grid;place-items:center;width:48px;height:48px;border-radius:8px;background:var(--accent-light);color:var(--accent-hover)}.feature-card h2{margin:18px 0 8px;font-size:18px;line-height:1.4}.feature-card p{margin:0;color:var(--text-secondary)}.feature-action{margin-top:26px;color:var(--accent-hover);font-weight:600}.workspace-page{flex:1 1 auto;min-height:calc(100dvh - var(--navbar-height) - var(--footer-height));padding:22px 24px 28px}.page-heading{max-width:1220px;margin:0 auto 18px}.page-heading h1{margin:0;font-size:22px;line-height:1.3}.page-heading p{margin:6px 0 0;color:var(--text-secondary)}.split-layout{display:grid;max-width:1220px;margin:0 auto;border:1px solid var(--border);border-radius:8px;background:var(--bg-panel);box-shadow:var(--shadow);overflow:hidden}.polish-layout{grid-template-columns:minmax(360px,45%) minmax(0,55%);min-height:680px}.pdf-layout{grid-template-columns:minmax(520px,48%) minmax(0,52%);width:min(1760px,100%);max-width:min(1760px,calc(100vw - 32px));flex:1 1 auto;height:auto;min-height:0}.left-panel{padding:24px;border-right:1px solid var(--border);background:var(--bg-primary)}.input-panel,.left-panel{display:flex;flex-direction:column;gap:16px}.panel-section{display:grid;grid-gap:10px;gap:10px}.panel-section.grow{min-height:0}.annotation-section-title-row,.result-header,.section-header{display:flex;align-items:center;justify-content:space-between;gap:12px}.history-panel h2,.result-header h2,.section-header h2{margin:0;font-size:16px;line-height:1.4}.segmented-control{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:4px;gap:4px;padding:4px;border:1px solid var(--border);border-radius:8px;background:var(--bg-secondary)}.segmented-control button{min-height:36px;border:0;border-radius:6px;background:transparent;color:var(--text-secondary);cursor:pointer}.segmented-control button.selected{background:var(--accent);color:white}.mode-help,.muted{margin:0;color:var(--text-secondary);font-size:13px}.small{font-size:13px}.textarea{width:100%;min-height:260px;resize:vertical;padding:12px 14px;border:1px solid var(--border);border-radius:8px;background:#ffffff;color:var(--text-primary);line-height:1.7;outline:none}.chat-input input:focus,.textarea:focus{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}.input-meta{display:flex;justify-content:space-between;gap:12px;min-height:24px;color:var(--text-secondary);font-size:13px}.input-meta.danger{color:var(--error)}.action-row{display:flex;justify-content:space-between;gap:12px}.btn{justify-content:center;border:1px solid transparent;border-radius:8px;cursor:pointer;font-weight:600;transition:background .15s ease,border-color .15s ease,transform .1s ease,opacity .15s ease}.btn:active:not(:disabled){transform:scale(.97)}.btn:disabled{cursor:not-allowed;opacity:.4}.btn-md{min-height:40px;padding:8px 16px}.btn-sm{min-height:32px;padding:6px 10px;font-size:13px}.btn-icon{width:40px;height:40px;padding:0}.btn-primary{background:var(--accent);color:white}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-secondary{border-color:var(--border);background:white;color:var(--text-primary)}.btn-ghost:hover:not(:disabled),.btn-secondary:hover:not(:disabled){background:var(--bg-secondary)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-danger{background:#fee2e2;color:var(--error)}.spinner,.upload-spin{animation:spin .9s linear infinite}.spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.45);border-top-color:#fff;border-radius:999px}@keyframes spin{to{transform:rotate(1turn)}}.history-panel{margin-top:auto;border-top:1px solid var(--border);padding-top:12px}.history-toggle{width:100%;justify-content:space-between;border:0;background:transparent;color:var(--text-primary);cursor:pointer;padding:8px 0;font-weight:600}.history-toggle 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span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-secondary);font-size:12px}.history-delete{display:grid;place-items:center;width:32px;height:32px;margin-right:4px;border:0;border-radius:6px;background:transparent;color:var(--text-tertiary);cursor:pointer}.history-delete:hover{background:#fee2e2;color:var(--error)}.result-panel{min-width:0;padding:24px;overflow-y:auto}.result-header{position:-webkit-sticky;position:sticky;top:0;z-index:5;padding-bottom:14px;background:var(--bg-panel)}.chat-empty,.empty-state{display:grid;place-items:center;grid-gap:8px;gap:8px;min-height:300px;color:var(--text-tertiary);text-align:center}.annotation-list{display:grid;grid-gap:12px;gap:12px}.annotation-card{border:1px solid var(--border);border-radius:8px;background:white;box-shadow:var(--shadow);overflow:hidden;animation:slideIn .2s ease}.annotation-card-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border)}.annotation-card-header h3{margin:0;font-size:15px}.icon-text-button{border:0;background:transparent;color:var(--text-secondary);cursor:pointer}.annotation-card-body{display:grid;grid-gap:14px;gap:14px;padding:16px}.annotation-section,.annotation-tile{display:grid;grid-gap:8px;gap:8px}.annotation-section h4,.annotation-tile h4{display:inline-flex;align-items:center;gap:6px;margin:0;font-size:14px}.annotation-tile{padding:14px;border:1px solid var(--border);border-radius:8px;white-space:pre-wrap}.translation-tile{background:#f8fafc}.issue-tile{background:#fff7ed}.polished-tile{background:var(--success-bg)}.polished-translation-tile{background:#eef2ff}.polished-translation-tile h4,.translation-tile h4{color:#4338ca}.issue-tile h4{color:var(--error)}.polished-tile h4{color:var(--success-text)}.issue-title{color:var(--error)}.polished-title{color:var(--success-text)}.original-box,.polished-box{padding:12px;border-radius:8px;white-space:pre-wrap}.original-box{background:var(--bg-secondary);color:#555555}.polished-box{background:var(--success-bg)}.issue-list{margin:0;padding-left:20px;color:#374151}.skeleton-card{padding:16px}.skeleton-line{height:12px;margin:10px 0;border-radius:999px;background:linear-gradient(90deg,#f2f2ef,#e8e6df,#f2f2ef);background-size:220% 100%;animation:shimmer 1.2s ease-in-out infinite}.skeleton-line.short{width:34%}.skeleton-card pre{max-height:120px;overflow:hidden;color:var(--text-tertiary);white-space:pre-wrap;font-size:12px}@keyframes shimmer{to{background-position:-220% 0}}@keyframes slideIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.streaming-hint,.warning-note{margin-top:12px;padding:10px 12px;border-radius:8px;background:var(--warning-bg);color:#92400e;font-size:13px}.error-banner{display:flex;align-items:center;gap:8px;margin-bottom:12px;padding:10px 12px;border:1px solid #fecaca;border-radius:8px;background:#fef2f2;color:var(--error)}.inline-retry{margin-left:auto;border:0;background:transparent;color:var(--error);cursor:pointer;font-weight:700}.upload-page{min-height:calc(100dvh - var(--navbar-height) - var(--footer-height));display:grid;place-items:center;align-content:center;grid-gap:22px;gap:22px;padding:32px 24px}.upload-zone{display:grid;place-items:center;width:min(520px,100%);min-height:300px;padding:32px;border:2px dashed var(--border-strong);border-radius:8px;background:white;color:var(--text-secondary);text-align:center;cursor:pointer;transition:background .15s ease,border-color .15s ease}.upload-zone.dragging,.upload-zone:hover{border-color:var(--accent);background:var(--accent-light)}.upload-zone h1{margin:12px 0 4px;color:var(--text-primary);font-size:22px}.upload-zone p{margin:0}.upload-error{color:var(--error)}.progress-bar{width:min(300px,100%);height:6px;margin-top:12px;overflow:hidden;border-radius:999px;background:var(--bg-secondary)}.progress-bar span{display:block;width:38%;height:100%;border-radius:inherit;background:var(--accent);animation:progress 1.2s ease-in-out infinite}@keyframes progress{0%{transform:translateX(-120%)}to{transform:translateX(270%)}}.pdf-history{width:min(720px,100%)}.pdf-history h2{margin:0 0 10px;color:var(--text-secondary);font-size:14px;font-weight:600;text-align:center}.pdf-history-list{display:grid;grid-gap:8px;gap:8px}.pdf-topbar{width:min(1760px,100%);max-width:min(1760px,calc(100vw - 32px));flex:0 0 auto;margin:0 auto 8px;justify-content:space-between}.pdf-topbar strong{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mobile-preview-note{display:none;max-width:min(1760px,calc(100vw - 32px));margin:0 auto 12px;color:var(--text-secondary);font-size:13px}.pdf-workspace{display:flex;flex-direction:column;height:calc(100dvh - var(--navbar-height) - var(--footer-height));min-height:0;overflow:hidden;padding:8px 16px 10px}.pdf-viewer{display:grid;grid-template-rows:minmax(0,1fr) auto;min-height:0;min-width:0;border-right:1px solid var(--border);background:var(--bg-secondary)}.pdf-viewer-empty{place-items:center;padding:24px;color:var(--text-secondary);text-align:center}.pdf-canvas-wrap{min-height:0;overflow:auto;padding:16px;text-align:center}.pdf-canvas-wrap canvas{max-width:100%;background:white;box-shadow:0 4px 18px rgba(0,0,0,.12)}.pdf-controls{justify-content:space-between;padding:12px;border-top:1px solid var(--border);background:white;font-size:13px}.chat-panel{display:grid;grid-template-rows:minmax(0,1fr) auto;min-height:0;min-width:0;overflow:hidden;background:white}.chat-scroll{min-height:0;max-height:100%;overflow-y:auto;padding:20px;overscroll-behavior:contain}.assistant-welcome{display:grid;grid-template-columns:auto minmax(0,1fr);grid-gap:12px;gap:12px;padding:14px;border:1px solid var(--border);border-radius:8px;background:var(--bg-secondary)}.welcome-icon{display:grid;place-items:center;width:34px;height:34px;border-radius:8px;background:white;color:var(--accent-hover)}.assistant-welcome h2{margin:0 0 4px;font-size:16px}.assistant-welcome p{margin:0}.quick-questions{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}.quick-questions button{min-height:34px;padding:6px 12px;border:1px solid var(--border);border-radius:999px;background:white;color:var(--text-primary);cursor:pointer}.quick-questions button:hover{background:var(--accent-light);border-color:var(--accent)}.chat-message{display:flex;margin:12px 0}.chat-message.user{justify-content:flex-end}.chat-message.assistant{justify-content:flex-start}.chat-bubble{max-width:min(880px,90%);padding:10px 14px;border-radius:14px;animation:chatIn .15s ease}.chat-message.user .chat-bubble{border-bottom-right-radius:4px;background:var(--user-bubble-bg);color:var(--user-bubble-text)}.chat-message.assistant .chat-bubble{border-bottom-left-radius:4px;background:var(--ai-bubble-bg);color:var(--ai-bubble-text)}.chat-bubble p{margin:0 0 8px;white-space:pre-wrap}.chat-bubble p:last-child{margin-bottom:0}.markdown-content{display:grid;grid-gap:10px;gap:10px}.markdown-content :where(p,ul,ol,blockquote,pre,table,h1,h2,h3,h4){margin:0}.markdown-content :where(h1,h2,h3,h4){line-height:1.35}.markdown-content ol,.markdown-content ul{padding-left:22px}.markdown-content blockquote{padding-left:12px;border-left:3px solid var(--border-strong);color:var(--text-secondary)}.markdown-content code{padding:2px 5px;border-radius:5px;background:rgba(0,0,0,.06);font-family:JetBrains Mono,Fira Code,SF Mono,Consolas,monospace;font-size:.92em}.markdown-content pre{overflow-x:auto;padding:12px;border-radius:8px;background:#111827;color:#f9fafb}.markdown-content pre code{padding:0;background:transparent;color:inherit}.markdown-content table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse}.markdown-content td,.markdown-content th{padding:6px 8px;border:1px solid var(--border)}.markdown-content .katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0}@keyframes chatIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.chat-input{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-gap:10px;gap:10px;padding:14px;border-top:1px solid var(--border);background:var(--bg-primary)}.chat-input input{min-width:0;min-height:40px;padding:9px 13px;border:1px solid var(--border);border-radius:8px;outline:none}@media (max-width:1023px){.pdf-layout,.polish-layout{grid-template-columns:1fr 1fr}.workspace-page{padding-inline:16px}}@media (max-width:767px){:root{--footer-height:42px}.navbar{padding:0 14px}.brand span{display:none}.nav-link{padding-inline:9px}.footer{flex-direction:column;gap:2px;min-height:42px;padding:4px 10px}.home-page{align-items:start;padding-top:54px}.hero-copy h1{font-size:24px}.feature-grid,.polish-layout{grid-template-columns:1fr}.feature-card{min-height:210px}.split-layout{border-radius:0;margin-inline:-16px;border-left:0;border-right:0}.polish-layout{min-height:unset}.left-panel{border-right:0;border-bottom:1px solid var(--border)}.result-panel{min-height:480px}.segmented-control{grid-template-columns:1fr}.action-row,.input-meta{flex-direction:column}.pdf-layout{display:block;flex:1 1 auto;height:auto;min-height:0;max-width:none}.pdf-viewer{display:none}.mobile-preview-note{display:block}.chat-panel{height:100%}.pdf-topbar{gap:8px}.pdf-topbar .btn{flex-shrink:0}.chat-bubble{max-width:92%}.upload-zone{min-height:260px;padding:24px}}