:root{--bg: #f8fafc;--surface: #ffffff;--border: #e2e8f0;--border-strong: #cbd5e1;--text: #0f172a;--text-dim: #64748b;--primary: #2563eb;--primary-hover: #1d4ed8;--danger: #dc2626;--radius: 10px;--shadow: 0 1px 3px rgb(15 23 42 / .06), 0 4px 14px rgb(15 23 42 / .05);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text)}.app{display:flex;flex-direction:column;min-height:100%;max-width:1280px;margin:0 auto;padding:16px 20px 0}.header{display:flex;align-items:center;justify-content:space-between;padding:6px 2px 14px}.brand{display:flex;align-items:center;gap:10px}.brand-mark{width:36px;height:36px;display:grid;place-items:center;border-radius:9px;background:var(--primary);color:#fff;font-size:22px;font-family:Times New Roman,serif}.brand-name{font-size:18px;font-weight:700;letter-spacing:.2px}.badges{display:flex;gap:8px}.badge{font-size:12px;color:var(--text-dim);border:1px solid var(--border);border-radius:999px;padding:3px 10px;background:var(--surface)}.main{display:grid;grid-template-columns:minmax(320px,44%) 1fr;gap:16px;flex:1;align-items:stretch}@media (max-width: 900px){.main{grid-template-columns:1fr}}.pane{display:flex;flex-direction:column;gap:12px;min-width:0}.pane-left{min-height:420px}.dropzone{position:relative;flex:1;display:grid;place-items:center;border:2px dashed var(--border-strong);border-radius:var(--radius);background:var(--surface);cursor:pointer;transition:border-color .15s,background .15s;min-height:320px;overflow:hidden}.dropzone:hover,.dropzone.dragging{border-color:var(--primary);background:#f0f6ff}.dropzone.has-image{border-style:solid}.dropzone-empty{text-align:center;padding:32px 24px;color:var(--text-dim)}.dropzone-icon{font-size:44px;color:var(--border-strong);font-family:Times New Roman,serif;line-height:1;margin-bottom:12px}.dropzone-title{font-size:16px;font-weight:600;color:var(--text);margin-bottom:6px}.dropzone-sub{font-size:13px}.dropzone-formats{font-size:12px;margin-top:10px;opacity:.75}kbd{padding:1px 5px;border:1px solid var(--border);border-bottom-width:2px;border-radius:4px;background:#f1f5f9;font-size:11px;font-family:inherit}.dropzone-preview{display:flex;flex-direction:column;align-items:center;gap:8px;padding:16px;width:100%}.dropzone-preview img{max-width:100%;max-height:46vh;object-fit:contain;border-radius:6px}.dropzone-meta{font-size:12px;color:var(--text-dim)}.dropzone-hint{font-size:12px;color:var(--text-dim);opacity:.8}.dropzone-busy{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:#ffffffd1;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);font-size:14px;color:var(--text)}.spinner{width:26px;height:26px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:8px 10px}.toolbar-actions{display:flex;gap:8px;flex-wrap:wrap}.toolbar-status{font-size:12px;color:var(--text-dim);white-space:nowrap}.btn{border:1px solid var(--border-strong);background:var(--surface);color:var(--text);border-radius:8px;padding:7px 14px;font-size:13px;cursor:pointer;transition:all .12s}.btn:hover:not(:disabled){border-color:var(--primary);color:var(--primary)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover);color:#fff}.btn-icon{padding:7px 10px}.btn-ghost{border:none;background:none;color:var(--text-dim);font-size:12px;padding:4px 8px}.btn-ghost:hover{color:var(--danger)}.settings-panel{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:8px 16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px}.field{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-dim)}.field>span:first-child{min-width:3.5em}.field-value{font-variant-numeric:tabular-nums;color:var(--text);min-width:4em}.field input[type=range]{flex:1;accent-color:var(--primary)}.field input[type=color]{width:32px;height:26px;padding:0;border:1px solid var(--border);border-radius:6px;cursor:pointer;background:none}.field select{border:1px solid var(--border-strong);border-radius:6px;padding:4px 6px;font-size:13px;background:var(--surface)}.error-banner{background:#fef2f2;border:1px solid #fecaca;color:var(--danger);border-radius:var(--radius);padding:10px 14px;font-size:13px}.preview{flex:1 1 0;min-height:150px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:auto;display:flex}.preview-canvas{position:relative;flex:1;min-height:150px;padding:20px;display:grid;place-items:center}.preview-canvas mjx-container{max-width:100%;overflow-x:auto;overflow-y:hidden}.preview-placeholder{color:var(--text-dim);font-size:13px}.preview-error{position:absolute;inset:auto 12px 12px 12px;background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:8px 12px}.preview-error-title{color:var(--danger);font-weight:600;font-size:13px}.preview-error-msg{color:#b91c1c;font-size:12px;margin-top:2px;word-break:break-all}.editor{flex:1 1 0;min-height:150px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}.editor-head{display:flex;justify-content:space-between;align-items:center;padding:7px 12px;border-bottom:1px solid var(--border)}.editor-label{font-size:12px;font-weight:600;color:var(--text-dim)}.editor-hint{font-size:11px;color:var(--text-dim);opacity:.8}.editor-area{display:block;flex:1;width:100%;min-height:0;resize:none;border:none;outline:none;padding:12px;font:13px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,Liberation Mono,monospace;color:var(--text);background:transparent}.history{margin-top:16px;border-top:1px solid var(--border);padding:10px 2px 18px}.history-head{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--text-dim);margin-bottom:8px}.history-list{display:flex;gap:10px;overflow-x:auto;padding-bottom:4px}.history-item{position:relative;flex:0 0 auto}.history-thumb{width:96px;height:56px;border:1px solid var(--border);border-radius:8px;background:var(--surface);overflow:hidden;cursor:pointer;padding:0;display:block}.history-thumb img{width:100%;height:100%;object-fit:cover}.history-thumb:hover{border-color:var(--primary)}.history-remove{position:absolute;top:-6px;right:-6px;width:18px;height:18px;border-radius:50%;border:none;background:var(--text);color:#fff;font-size:12px;line-height:1;cursor:pointer;display:grid;place-items:center;opacity:0;transition:opacity .12s}.history-item:hover .history-remove{opacity:.85}.toast{position:fixed;bottom:28px;left:50%;transform:translate(-50%);background:var(--text);color:#fff;font-size:13px;padding:9px 18px;border-radius:999px;box-shadow:var(--shadow);animation:toast-in .18s ease-out;z-index:50}@keyframes toast-in{0%{opacity:0;transform:translate(-50%,6px)}to{opacity:1;transform:translate(-50%)}}.admin{max-width:1080px;margin:0 auto;padding:20px 16px 60px}.admin-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.admin-title{font-size:17px;font-weight:700}.admin-nav{display:flex;gap:6px;border-bottom:1px solid var(--border);margin-bottom:18px}.admin-tab{border:none;background:none;padding:9px 16px;font-size:14px;color:var(--text-dim);cursor:pointer;border-bottom:2px solid transparent}.admin-tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}.admin-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}.admin-card h3{margin:0 0 6px;font-size:15px}.admin-card h4{margin:18px 0 8px;font-size:13px;color:var(--text-dim)}.admin-hint{font-size:12px;color:var(--text-dim);margin:0 0 14px}.admin-loading{color:var(--text-dim);padding:40px;text-align:center}.admin-field{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--text-dim);margin-bottom:12px}.admin-field input,.admin-toolbar input,.admin-toolbar select{border:1px solid var(--border-strong);border-radius:6px;padding:8px 10px;font-size:13px}.admin-field input{background:#fff}.admin-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}.admin-actions{display:flex;align-items:center;gap:12px;margin-top:6px}.admin-msg{font-size:13px;color:var(--primary)}.admin-error{color:var(--danger);font-size:13px}.admin-toolbar{display:flex;gap:10px;margin-bottom:12px}.admin-toolbar input{min-width:220px}.admin-table{width:100%;border-collapse:collapse;font-size:13px}.admin-table th{text-align:left;font-size:12px;color:var(--text-dim);font-weight:600;padding:8px 10px;border-bottom:1px solid var(--border);white-space:nowrap}.admin-table td{padding:8px 10px;border-bottom:1px solid var(--border);vertical-align:middle}.admin-table tr.clickable:hover{background:#f8fafc;cursor:pointer}.admin-table .ellipsis{max-width:260px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.admin-table .mono{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px}.admin-pager{display:flex;align-items:center;gap:14px;justify-content:flex-end;margin-top:12px;font-size:13px;color:var(--text-dim)}.admin-actions-cell{white-space:nowrap}.admin-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin:12px 0}.stat-card{background:#f8fafc;border:1px solid var(--border);border-radius:8px;padding:14px;text-align:center}.stat-num{font-size:22px;font-weight:700}.stat-label{font-size:12px;color:var(--text-dim);margin-top:2px}.stat-bars{display:flex;align-items:flex-end;gap:6px;height:120px;padding:8px 0}.stat-bar-item{flex:1;display:flex;flex-direction:column;align-items:center;height:100%;justify-content:flex-end}.stat-bar{width:100%;max-width:34px;background:var(--primary);border-radius:3px 3px 0 0;min-height:2px;opacity:.85}.stat-bar-label{font-size:10px;color:var(--text-dim);margin-top:4px}.level{font-size:11px;padding:1px 7px;border-radius:999px}.level-info{background:#eff6ff;color:#1d4ed8}.level-warn{background:#fef3c7;color:#b45309}.level-error{background:#fee2e2;color:#b91c1c}.admin-login{display:grid;place-items:center;min-height:70vh}.admin-login-card{display:flex;flex-direction:column;gap:12px;width:320px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}.admin-login-card h2{margin:0 0 6px;font-size:16px;text-align:center}.admin-login-card input{border:1px solid var(--border-strong);border-radius:6px;padding:9px 11px;font-size:14px}.admin-modal{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a73;display:grid;place-items:center;z-index:60}.admin-modal-card{background:var(--surface);border-radius:var(--radius);padding:22px;width:min(680px,92vw);max-height:86vh;overflow:auto}.admin-detail{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:6px 18px;margin:10px 0;font-size:13px}.admin-detail dt{color:var(--text-dim);display:inline}.admin-detail dd{display:inline;margin:0 0 0 6px;word-break:break-all}.admin-detail-img{max-width:100%;max-height:220px;border:1px solid var(--border);border-radius:6px;margin:10px 0;background:#fff}.admin-latex{background:#f8fafc;border:1px solid var(--border);border-radius:6px;padding:10px 12px;font-size:12px;white-space:pre-wrap;word-break:break-all;max-height:180px;overflow:auto}.privacy-link{font-size:12px;color:var(--text-dim);text-decoration:none;padding:3px 6px}.privacy-link:hover{color:var(--primary)}.privacy{max-width:720px;margin:0 auto;padding:28px 20px 60px}.privacy-head h1{font-size:22px;margin:12px 0 4px}.privacy-updated{font-size:12px;color:var(--text-dim);margin:0 0 8px}.privacy-back{font-size:13px;color:var(--primary);text-decoration:none}.privacy section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;margin-top:14px}.privacy h2{font-size:15px;margin:0 0 10px}.privacy ul{margin:0;padding-left:20px}.privacy li{font-size:14px;line-height:1.8;color:var(--text)}.privacy p{font-size:14px;line-height:1.7;margin:6px 0 0}