:root{--primary:#2563eb;--primary-hover:#1d4ed8;--text:#1a1a1a;--text-secondary:#6b7280;--border:#e5e7eb;--bg:#f9fafb;--surface:#fff;--warning:#b45309;--warning-bg:#fffbeb;--danger:#b91c1c;--radius:8px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);min-height:100vh;margin:0}.app-header{background:var(--surface);border-bottom:1px solid var(--border);grid-template-columns:1fr auto 1fr;align-items:center;gap:20px;min-height:58px;padding:0 28px;display:grid}.brand{width:fit-content;color:var(--text);align-items:center;gap:10px;font-weight:750;text-decoration:none;display:inline-flex}.brand img{border-radius:7px}.privacy-line{color:var(--text-secondary);margin:0;font-size:12.5px}.privacy-line>span:first-child{color:#16a34a;font-size:9px}.language-switch{background:#f1f5f9;border-radius:7px;justify-self:end;padding:3px;display:flex}.language-switch button{color:var(--text-secondary);cursor:pointer;background:0 0;border:0;border-radius:5px;padding:5px 9px}.language-switch button.active{color:var(--primary);background:#fff;box-shadow:0 1px 3px #0f172a1a}#app{width:min(1180px,100% - 36px);margin:0 auto;padding:54px 0 72px}.intro{max-width:760px;margin-bottom:34px}.intro h1{letter-spacing:-.04em;margin:8px 0 13px;font-size:clamp(32px,5vw,52px);line-height:1.07}.intro>p:last-child{max-width:680px;color:var(--text-secondary);margin:0;font-size:16px;line-height:1.7}.eyebrow{color:var(--primary);letter-spacing:.12em;text-transform:uppercase;margin:0;font-size:11px;font-weight:800}.workspace{grid-template-columns:minmax(260px,.68fr) minmax(0,1.55fr);align-items:stretch;gap:14px;display:grid}.summary-card,.output-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:0 14px 36px #0f172a0f}.summary-card{flex-direction:column;gap:24px;padding:24px;display:flex}.summary-card h2{overflow-wrap:anywhere;margin:7px 0 0;font-size:18px}.output-card{min-width:0;overflow:hidden}.output-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;min-height:62px;padding:12px 14px 12px 18px;font-weight:700;display:flex}.actions{gap:8px;display:flex}@media (width<=780px){.app-header{grid-template-columns:1fr auto;padding:10px 18px}.privacy-line{grid-area:2/1/auto/-1;padding-bottom:4px}.workspace{grid-template-columns:1fr}.intro{margin-bottom:26px}#app{padding-top:36px}.output-header{flex-direction:column;align-items:flex-start}.actions{width:100%}.actions .button{flex:1}}@media (width<=460px){#app{width:min(100% - 24px,1180px)}.intro h1{font-size:34px}.app-header{padding-inline:12px}.brand span{font-size:14px}}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}[hidden]{display:none!important}.upload-card{text-align:center;background:var(--surface);border:1.5px dashed #93c5fd;border-radius:16px;flex-direction:column;justify-content:center;align-items:center;min-height:360px;padding:52px 28px;transition:border-color .18s,background .18s,transform .18s;display:flex;position:relative;box-shadow:0 16px 42px #2563eb12}.upload-card.is-dragging{border-color:var(--primary);background:#eff6ff;transform:translateY(-2px)}.upload-card h2{margin:20px 0 7px;font-size:24px}.upload-card>p{color:var(--text-secondary);margin:0 0 22px}.upload-card small{color:#94a3b8;margin-top:15px}.format-rail{align-items:center;gap:13px;display:flex}.file-chip{color:#1e40af;background:#dbeafe;border:1px solid #93c5fd;border-radius:8px 8px 8px 2px;place-items:center;width:62px;height:47px;font:800 12px/1 ui-monospace,SFMono-Regular,Menlo,monospace;display:grid;box-shadow:0 6px 16px #2563eb1c}.file-chip.md{color:#166534;background:#dcfce7;border-color:#86efac}.rail-arrow{color:#64748b;font-size:22px}.button{border:1px solid var(--border);border-radius:var(--radius);min-height:38px;color:var(--text);font:inherit;cursor:pointer;background:#fff;justify-content:center;align-items:center;gap:6px;padding:8px 14px;font-size:13px;font-weight:700;transition:background .15s,border-color .15s,transform .15s;display:inline-flex}.button:hover{background:#f8fafc;border-color:#cbd5e1}.button:active{transform:translateY(1px)}.button.primary{background:var(--primary);border-color:var(--primary);color:#fff}.button.primary:hover{background:var(--primary-hover)}.button.subtle{color:var(--text-secondary)}.button.wide{width:100%;margin-top:auto}.button:focus-visible,.language-switch button:focus-visible,textarea:focus-visible,input:focus-visible+span,label.button:focus-within{outline-offset:2px;outline:3px solid #bfdbfe}.progress{gap:10px;width:min(420px,100%);margin-top:18px;display:grid}.progress-track{background:#e2e8f0;border-radius:999px;height:6px;overflow:hidden}.progress-track span{background:var(--primary);border-radius:inherit;width:8%;height:100%;transition:width .2s;display:block}.progress>span{color:var(--text-secondary);font-size:13px}.error-message{background:#fef2f2;border:1px solid #fecaca;border-radius:8px;max-width:620px;padding:11px 14px;color:var(--danger)!important;margin:18px 0 0!important}.metrics{grid-template-columns:repeat(3,1fr);gap:8px;margin:0;display:grid}.metrics div{text-align:center;background:#f8fafc;border:1px solid #eef2f7;border-radius:9px;padding:12px 8px}.metrics dt{color:var(--text-secondary);font-size:11px}.metrics dd{margin:5px 0 0;font-size:22px;font-weight:800}.warnings{gap:8px;display:grid}.warning{color:#92400e;background:var(--warning-bg);border:1px solid #fde68a;border-radius:8px;margin:0;padding:10px 11px;font-size:12px;line-height:1.5}.toggle{color:#334155;cursor:pointer;align-items:center;gap:9px;font-size:13px;font-weight:650;display:flex}.toggle input{width:17px;height:17px;accent-color:var(--primary)}#markdown-output{resize:vertical;color:#172033;tab-size:2;background:#fbfdff;border:0;outline:0;width:100%;min-height:590px;padding:20px;font:13px/1.75 SFMono-Regular,Consolas,Liberation Mono,monospace;display:block}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important}}