:root{--bg:#f7f8fc;--text:#111827;--muted:#64748b;--card:#fff;--line:#e5e7eb;--accent:#6d4aff;--accent2:#8b5cf6;--shadow:0 14px 40px rgba(15,23,42,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}.top{height:70px;display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,calc((100% - 1180px)/2));background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.brand{font-weight:900;font-size:24px;color:var(--text);text-decoration:none}.brand span{color:var(--accent)}nav{display:flex;gap:24px}nav a{color:var(--muted);text-decoration:none;font-weight:650}.hero{max-width:900px;margin:auto;text-align:center;padding:90px 20px 70px}.pill{display:inline-block;padding:8px 13px;border-radius:999px;background:#eee9ff;color:#5533d8;font-weight:750;font-size:13px}.hero h1{font-size:clamp(42px,7vw,76px);line-height:1.02;margin:20px 0}.hero h1 span{color:var(--accent)}.hero p{font-size:20px;line-height:1.6;color:var(--muted);max-width:700px;margin:0 auto}.hero-actions{display:flex;gap:12px;justify-content:center;margin-top:28px}.btn{border:0;border-radius:12px;padding:13px 19px;font-weight:800;cursor:pointer;text-decoration:none;display:inline-block}.primary{background:var(--accent);color:#fff}.ghost{background:#fff;color:var(--text);border:1px solid var(--line)}.section{max-width:1180px;margin:auto;padding:55px 20px}.section-head{text-align:center;margin-bottom:25px}.section h2{font-size:34px;margin:0 0 7px}.section-head p,.about p{color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow);text-decoration:none;color:var(--text);min-height:125px;transition:.2s}.card:hover{transform:translateY(-3px)}.card b{display:block;font-size:18px;margin-bottom:10px}.card span{color:var(--muted);font-size:14px}.ai{max-width:900px}.ai-box{background:#fff;border:1px solid var(--line);padding:18px;border-radius:20px;box-shadow:var(--shadow)}textarea{width:100%;min-height:150px;border:1px solid var(--line);border-radius:14px;padding:15px;font:inherit;resize:vertical}#aiBtn{margin-top:12px}pre{white-space:pre-wrap;background:#f5f6fa;padding:16px;border-radius:12px;min-height:30px}small{color:var(--muted)}code{background:#eef0f5;padding:2px 5px;border-radius:5px}.tool-page{max-width:900px;margin:auto;padding:55px 20px}.tool-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:25px;box-shadow:var(--shadow)}.drop{border:2px dashed #cbd5e1;border-radius:18px;padding:45px 20px;text-align:center;margin:18px 0;background:#fafbff}.drop.drag{border-color:var(--accent);background:#f3f0ff}.row{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}.row input,.row select{padding:11px;border:1px solid var(--line);border-radius:10px}.result{margin-top:18px}.download{display:inline-block;margin:7px;padding:10px 14px;background:#111827;color:#fff;border-radius:10px;text-decoration:none}.notice{padding:12px;border-radius:10px;background:#f1f5f9;color:#475569}.back{display:inline-block;margin-bottom:20px;color:var(--accent);text-decoration:none;font-weight:700}footer{text-align:center;color:var(--muted);padding:40px 20px;border-top:1px solid var(--line)}@media(max-width:850px){.grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:560px){nav{display:none}.grid{grid-template-columns:1fr}.hero{padding-top:55px}.hero h1{font-size:44px}.hero-actions{flex-direction:column}.tool-page{padding-top:30px}}