:root{--bg:#f7fafc;--surface:#fff;--ink:#0f172a;--ink-soft:#475569;--line:#e2e8f0;--primary:#2563eb;--primary-700:#1d4ed8;--accent:#f59e0b;--accent-700:#d97706;--good:#16a34a;--radius:14px;--shadow:0 10px 30px rgba(15,23,42,.08)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.65;-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{width:100%;max-width:1080px;margin:0 auto;padding:0 20px}.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:-webkit-sticky;position:sticky;top:0;z-index:20}.site-header .inner{justify-content:space-between;height:64px}.brand,.site-header .inner{display:flex;align-items:center}.brand{gap:10px;font-weight:800;font-size:18px;color:var(--ink)}.brand-logo{width:30px;height:30px;border-radius:8px;object-fit:contain;flex-shrink:0}.brand .dot{width:12px;height:12px;border-radius:50%;background:var(--accent)}.nav{display:flex;gap:22px;font-size:15px}.nav a{color:var(--ink-soft);font-weight:600}.nav a:hover{color:var(--primary)}.btn,.nav a:hover{text-decoration:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:10px;padding:13px 22px;font-size:16px;font-weight:700;cursor:pointer;transition:transform .05s ease,background .15s ease}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-700);text-decoration:none}.btn-accent{background:var(--accent);color:#1f2937}.btn-accent:hover{background:var(--accent-700);color:#fff;text-decoration:none}.btn-ghost{background:transparent;color:var(--primary);border:2px solid var(--primary)}.btn-ghost:hover{background:var(--primary);color:#fff;text-decoration:none}.hero{background:linear-gradient(135deg,#eaf2ff,#fff7e6);padding:56px 0 48px}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;grid-gap:36px;gap:36px;align-items:center}.hero h1{font-size:42px;line-height:1.15;margin:0 0 14px;letter-spacing:-.02em}.hero .lede{font-size:18px;color:var(--ink-soft);margin:0 0 22px;max-width:540px}.hero .cta-row{display:flex;gap:12px;flex-wrap:wrap}.trust{margin-top:18px;font-size:14px;color:var(--ink-soft)}.trust b{color:var(--good)}.widget{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.widget .drop{border:2px dashed #cbd5e1;border-radius:12px;padding:34px 18px;text-align:center;background:#fbfdff;transition:border-color .15s ease,background .15s ease;cursor:pointer}.widget .drop.over{border-color:var(--primary);background:#eef4ff}.widget .drop .big{font-size:17px;font-weight:700;color:var(--ink)}.widget .drop .small{font-size:14px;color:var(--ink-soft);margin-top:6px}.widget .arrow{text-align:center;font-weight:800;color:var(--accent-700);margin:14px 0;font-size:20px}.widget .format-pill{display:inline-block;background:#eef2ff;color:var(--primary-700);border-radius:999px;padding:4px 12px;font-weight:700;font-size:13px}.widget .fileline{margin-top:14px;font-size:14px;color:var(--ink-soft);word-break:break-all}.progress{height:8px;background:#e2e8f0;border-radius:999px;overflow:hidden;margin-top:14px}.progress>span{display:block;height:100%;width:0;background:var(--primary);transition:width .2s ease}section.block{padding:54px 0}.section-head{text-align:center;margin-bottom:30px}.section-head h2{font-size:30px;margin:0 0 8px;letter-spacing:-.01em}.section-head p{color:var(--ink-soft);font-size:16px;margin:0 auto;max-width:620px}.cards{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:18px;gap:18px}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px}.card h3{margin:0 0 8px;font-size:18px}.card p{margin:0;color:var(--ink-soft);font-size:15px}.steps{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:18px;gap:18px;counter-reset:step}.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;position:relative}.step .num{width:34px;height:34px;border-radius:50%;background:var(--primary);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:12px}.step h3{margin:0 0 6px;font-size:17px}.step p{margin:0;color:var(--ink-soft);font-size:15px}.faq{max-width:820px;margin:0 auto}.faq details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:12px}.faq summary{font-weight:700;cursor:pointer;list-style:none}.faq summary::-webkit-details-marker{display:none}.faq details p{margin:10px 0 0;color:var(--ink-soft)}.exp-filters{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:26px}.chip{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:7px 14px;font-size:14px;font-weight:600;color:var(--ink-soft);cursor:pointer}.chip.active{background:var(--primary);color:#fff;border-color:var(--primary)}.exp-list{display:grid;grid-template-columns:1fr 1fr;grid-gap:16px;gap:16px}.exp{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}.exp .meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.exp .who{font-weight:700;font-size:15px}.exp .role{font-size:13px;color:var(--ink-soft)}.exp .rate{font-size:13px;font-weight:700;color:var(--accent-700);white-space:nowrap}.exp h3{margin:4px 0 8px;font-size:16px}.exp p{margin:0;font-size:14.5px;color:var(--ink-soft)}.exp .tag{display:inline-block;margin-top:10px;font-size:12px;font-weight:700;color:var(--primary-700);background:#eef2ff;border-radius:6px;padding:3px 9px}.stats{background:var(--primary);color:#fff;border-radius:var(--radius);padding:26px;display:grid;grid-template-columns:repeat(4,1fr);grid-gap:16px;gap:16px;text-align:center}.stats .n{font-size:30px;font-weight:800}.stats .l{font-size:14px;opacity:.92}.site-footer{background:#0f172a;color:#cbd5e1;padding:40px 0 28px;margin-top:40px}.site-footer a{color:#93c5fd}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;grid-gap:24px;gap:24px}.footer-grid h4{color:#fff;margin:0 0 12px;font-size:15px}.footer-grid ul{list-style:none;padding:0;margin:0}.footer-grid li{margin-bottom:8px;font-size:14px}.footer-bottom{border-top:1px solid #1e293b;margin-top:26px;padding-top:16px;font-size:13px;color:#94a3b8}@media (max-width:880px){.cards,.exp-list,.footer-grid,.hero-grid,.stats,.steps{grid-template-columns:1fr}.hero h1{font-size:32px}.nav{display:none}}.code{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:14px 16px;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:13.5px;line-height:1.55;overflow-x:auto;white-space:pre;margin:8px 0}.code.wide{white-space:pre;margin:8px 0 4px}.table-wrap{overflow-x:auto}.doc-table{width:100%;border-collapse:collapse;font-size:15px;background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden}.doc-table td,.doc-table th{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line)}.doc-table th{background:#f1f5f9;font-weight:700}.doc-table tr:last-child td{border-bottom:0}.doc-table td:first-child{font-family:SFMono-Regular,Consolas,Menlo,monospace;font-weight:700;color:var(--primary-700)}.batch-log{margin:16px 0 0;padding:14px 18px 14px 32px;background:#f8fafc;border:1px solid var(--line);border-radius:12px;font-size:14px;color:var(--ink-soft);max-height:220px;overflow-y:auto}.batch-log li{margin-bottom:4px}