:root{--paper: #f7f5f1;--surface: #ffffff;--surface-2: #fcfbf9;--surface-3: #f1eee8;--ink: #191c20;--ink-2: #4c525a;--ink-3: #8a9098;--line: #e7e3dc;--line-2: #d8d3ca;--brand: #2f5bd7;--brand-600: #2450c8;--brand-700: #1d43a8;--brand-50: #eef2fe;--brand-100: #dde6fd;--amber: #a2681a;--amber-50: #fdf5e8;--danger: #b4232a;--danger-50: #fdf1f1;--danger-line: #f2cacc;--ok: #157a55;--ok-50: #eaf6f1;--ok-line: #bfe3d4;--radius-lg: 18px;--radius: 14px;--radius-sm: 10px;--shadow-1: 0 1px 2px rgba(24, 24, 27, .04);--shadow-2: 0 4px 14px rgba(24, 24, 27, .06);--shadow-3: 0 12px 32px rgba(24, 24, 27, .09);--ring: 0 0 0 3px rgba(47, 91, 215, .15);color-scheme:light}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background-color:var(--paper);background-image:radial-gradient(900px 480px at 12% -8%,#fff,#fff0 62%),radial-gradient(760px 420px at 92% 4%,#fdf6ec,#fdf6ec00 60%);background-repeat:no-repeat;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;font-size:14px;line-height:1.65;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{max-width:1060px;margin:0 auto;padding:40px 20px 72px}.hero{margin-bottom:26px}.eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:600;color:var(--brand-700);background:var(--brand-50);border:1px solid var(--brand-100);border-radius:999px;padding:5px 13px;margin-bottom:14px}.hero h1{font-size:34px;line-height:1.25;font-weight:700;letter-spacing:-.02em;margin:0 0 10px}.hero h1 em{font-style:normal;color:var(--brand)}.hero-sub{margin:0;max-width:640px;color:var(--ink-2);font-size:15px}.badge-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.badge{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;color:var(--ink-2);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:5px 13px;box-shadow:var(--shadow-1)}.badge svg{color:var(--brand)}.tabs{display:inline-flex;background:var(--surface-3);border:1px solid var(--line);border-radius:12px;padding:4px;gap:4px;margin-bottom:22px;box-shadow:var(--shadow-1)}.tab{display:inline-flex;align-items:center;gap:8px;border:0;background:transparent;color:var(--ink-2);font:inherit;font-size:13.5px;font-weight:600;padding:9px 18px;border-radius:9px;cursor:pointer;transition:background .18s,color .18s,box-shadow .18s}.tab:hover{color:var(--ink)}.tab[aria-selected=true]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-1)}.tab svg{color:var(--brand)}.segmented{display:inline-flex;background:var(--surface-3);border:1px solid var(--line);border-radius:10px;padding:3px;gap:2px}.segmented button{border:0;background:transparent;font:inherit;font-size:13px;font-weight:600;color:var(--ink-2);padding:6px 15px;border-radius:8px;cursor:pointer;transition:background .16s,color .16s,box-shadow .16s}.segmented button[data-active=true]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-1)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:22px 24px;margin-bottom:16px;box-shadow:var(--shadow-1);transition:box-shadow .2s,border-color .2s;animation:rise .32s ease both}.card:hover{box-shadow:var(--shadow-2)}@keyframes rise{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}@media (prefers-reduced-motion: reduce){.card{animation:none}}.card-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}.card-head .icon-chip{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:8px;background:var(--brand-50);color:var(--brand);flex:0 0 28px}.card h2{font-size:16px;font-weight:650;margin:0;letter-spacing:-.01em}.card h3{font-size:13px;margin:0 0 10px;color:var(--ink-3);font-weight:600}.card-note{color:var(--ink-3);font-size:13px;margin:0 0 16px}.dropzone{position:relative;border:1.5px dashed var(--line-2);border-radius:var(--radius-lg);background:var(--surface-2);padding:40px 24px;text-align:center;cursor:pointer;transition:border-color .18s,background .18s,transform .18s}.dropzone:hover,.dropzone.is-over{border-color:var(--brand);background:var(--brand-50)}.dropzone:focus-visible{outline:none;box-shadow:var(--ring)}.dropzone-icon{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:16px;background:var(--surface);border:1px solid var(--line);color:var(--brand);margin-bottom:14px;box-shadow:var(--shadow-1);transition:transform .2s,color .2s}.dropzone:hover .dropzone-icon,.dropzone.is-over .dropzone-icon{transform:translateY(-2px)}.dropzone-title{font-size:15px;font-weight:650;margin-bottom:5px}.dropzone-sub{color:var(--ink-3);font-size:13px}.dropzone-hint{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:16px}.dropzone-hint span{font-size:12px;color:var(--ink-3);background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:3px 11px}.field-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}.field{display:flex;flex-direction:column;gap:7px}.field label{font-size:12.5px;font-weight:600;color:var(--ink-2)}input[type=text],select,textarea{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line-2);border-radius:var(--radius-sm);padding:9px 12px;width:100%;outline:none;transition:border-color .15s,box-shadow .15s,background .15s}input[type=text]::placeholder,textarea::placeholder{color:var(--ink-3)}input[type=text]:hover,select:hover,textarea:hover{border-color:#c6c0b6}input[type=text]:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:var(--ring)}select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238a9098' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;padding-right:34px}textarea{min-height:220px;resize:vertical;font-family:ui-monospace,Cascadia Code,JetBrains Mono,Consolas,Microsoft YaHei,monospace;font-size:13px;line-height:1.75}.textarea-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:8px;font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums}.switch{display:inline-flex;align-items:center;gap:9px;font-size:13px;color:var(--ink-2);cursor:pointer;-webkit-user-select:none;user-select:none}.switch input{-moz-appearance:none;appearance:none;-webkit-appearance:none;margin:0;width:36px;height:20px;border-radius:999px;background:var(--line-2);position:relative;cursor:pointer;transition:background .18s;flex:0 0 36px}.switch input:after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:0 1px 2px #00000038;transition:transform .18s}.switch input:checked{background:var(--brand)}.switch input:checked:after{transform:translate(16px)}.switch input:focus-visible{box-shadow:var(--ring)}.option-row{display:flex;flex-wrap:wrap;gap:12px 22px;margin-bottom:18px}.btn-row{display:flex;flex-wrap:wrap;gap:10px}.btn{display:inline-flex;align-items:center;gap:7px;font:inherit;font-weight:600;font-size:13.5px;border-radius:var(--radius-sm);border:1px solid var(--line-2);background:var(--surface);color:var(--ink);padding:9px 16px;cursor:pointer;transition:background .15s,border-color .15s,color .15s,transform .06s,box-shadow .15s}.btn:hover:not(:disabled){border-color:var(--brand);color:var(--brand)}.btn:active:not(:disabled){transform:translateY(1px)}.btn:focus-visible{outline:none;box-shadow:var(--ring)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff;box-shadow:0 1px 2px #2f5bd740}.btn-primary:hover:not(:disabled){background:var(--brand-600);border-color:var(--brand-600);color:#fff}.btn-ghost{background:transparent;border-color:transparent;color:var(--ink-2)}.btn-ghost:hover:not(:disabled){background:var(--surface-3);color:var(--ink);border-color:transparent}.btn-lg{padding:12px 22px;font-size:14.5px;border-radius:12px}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(112px,1fr));gap:12px;margin-bottom:18px}.stat{background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius);padding:13px 15px}.stat-v{font-size:23px;font-weight:700;letter-spacing:-.02em;font-variant-numeric:tabular-nums;line-height:1.2}.stat-k{font-size:12px;color:var(--ink-3);margin-top:2px}.meta-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px 20px;margin:0;padding-top:16px;border-top:1px solid var(--line)}.meta-list dt{color:var(--ink-3);font-size:12px;margin-bottom:3px}.meta-list dd{margin:0;font-weight:600;font-size:13.5px;word-break:break-word}.chapter-list{max-height:300px;overflow:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-2)}.chapter-item{display:flex;align-items:baseline;gap:12px;padding:9px 14px;border-bottom:1px solid var(--line);font-size:13.5px;transition:background .14s}.chapter-item:hover{background:var(--surface)}.chapter-item:last-child{border-bottom:0}.chapter-index{flex:0 0 auto;min-width:26px;color:var(--ink-3);font-size:12px;font-variant-numeric:tabular-nums;background:var(--surface-3);border-radius:6px;text-align:center;padding:1px 6px;align-self:center}.export-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(196px,1fr));gap:12px}.export-card{display:flex;align-items:flex-start;gap:12px;text-align:left;font:inherit;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 15px;cursor:pointer;transition:border-color .16s,box-shadow .16s,transform .16s,background .16s}.export-card:hover:not(:disabled){border-color:var(--brand);box-shadow:var(--shadow-2);transform:translateY(-1px);background:var(--surface)}.export-card:active:not(:disabled){transform:none}.export-card:focus-visible{outline:none;box-shadow:var(--ring)}.export-card:disabled{opacity:.55;cursor:not-allowed}.export-card.is-primary{border-color:var(--brand-100);background:linear-gradient(180deg,var(--brand-50) 0%,var(--surface) 70%)}.export-icon{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:10px;background:var(--surface-3);color:var(--ink-2);flex:0 0 34px;transition:background .16s,color .16s}.export-card:hover:not(:disabled) .export-icon{background:var(--brand-50);color:var(--brand)}.export-card.is-primary .export-icon{background:var(--brand);color:#fff}.export-name{font-size:13.5px;font-weight:650;display:flex;align-items:center;gap:6px}.export-desc{display:block;font-size:12px;color:var(--ink-3);margin-top:3px;line-height:1.5}.preview-shell{border:1px solid #23272e;border-radius:var(--radius);overflow:hidden;background:#171b21}.preview-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 12px;background:#1d222a;border-bottom:1px solid #262c35;color:#9aa3af;font-size:12px}.preview-bar .dots{display:inline-flex;gap:5px;margin-right:4px}.preview-bar .dots i{width:9px;height:9px;border-radius:50%;background:#3a424e}.preview-bar button{border:0;background:#262c35;color:#c9d0da;font:inherit;font-size:12px;padding:4px 10px;border-radius:7px;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:background .15s,color .15s}.preview-bar button:hover{background:#313845;color:#fff}.preview{background:#171b21;color:#dfe5ee;padding:16px 18px;max-height:340px;overflow:auto;font-family:ui-monospace,Cascadia Code,JetBrains Mono,Consolas,monospace;font-size:12.5px;line-height:1.75;white-space:pre-wrap;word-break:break-word}.alert{display:flex;align-items:flex-start;gap:9px;border-radius:var(--radius-sm);padding:11px 14px;font-size:13px;margin-top:14px}.alert svg{flex:0 0 auto;margin-top:2px}.alert-error{background:var(--danger-50);border:1px solid var(--danger-line);color:var(--danger)}.alert-info{background:var(--ok-50);border:1px solid var(--ok-line);color:var(--ok)}.alert-note{background:var(--amber-50);border:1px solid #f0dfc4;color:var(--amber)}.loading-card{display:flex;align-items:center;gap:12px;color:var(--ink-2);font-size:13.5px}.spinner{display:inline-block;width:13px;height:13px;border:2px solid rgba(255,255,255,.45);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;flex:0 0 13px}.spinner-dark{border-color:var(--brand-100);border-top-color:var(--brand)}@keyframes spin{to{transform:rotate(360deg)}}.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:18px}.step{display:flex;gap:11px;padding:13px 14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-2)}.step-n{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:7px;background:var(--brand);color:#fff;font-size:12px;font-weight:700;flex:0 0 22px}.step-t{font-size:13px;font-weight:650}.step-d{font-size:12px;color:var(--ink-3);margin-top:1px}.faq{border-top:1px solid var(--line)}.faq details{border-bottom:1px solid var(--line)}.faq summary{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 2px;font-size:13.5px;font-weight:600;cursor:pointer;list-style:none;transition:color .15s}.faq summary::-webkit-details-marker{display:none}.faq summary:hover{color:var(--brand)}.faq summary:after{content:"+";color:var(--ink-3);font-weight:500;font-size:15px}.faq details[open] summary:after{content:"−"}.faq p{margin:0 0 15px;color:var(--ink-2);font-size:13px}.footer{color:var(--ink-3);font-size:12.5px;text-align:center;margin-top:36px;padding-top:22px;border-top:1px solid var(--line);line-height:1.9}.footer a{color:var(--brand);text-decoration:none}.footer a:hover{text-decoration:underline}@media (max-width: 720px){.app{padding:26px 16px 52px}.hero h1{font-size:26px}.card{padding:18px 17px}.tabs{display:flex;width:100%}.tab{flex:1;justify-content:center;font-size:13px;padding:9px 10px}.export-grid{grid-template-columns:1fr}}