:root{--bg:#f6f8fb;--card:#fff;--text:#162033;--muted:#687386;--line:#e5e9f0;--brand:#155eef;--brand2:#0ea5e9;--soft:#eef5ff;--ok:#0f9f6e;--shadow:0 10px 30px rgba(20,35,70,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,"PingFang SC","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.container{width:min(1120px,calc(100% - 32px));margin:auto}.topbar{background:#0f172a;color:#cbd5e1;font-size:13px}.topbar .container{display:flex;justify-content:space-between;gap:16px;padding:8px 0;flex-wrap:wrap}.nav{background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(10px)}.nav .container{display:flex;align-items:center;justify-content:space-between;min-height:68px;gap:24px}.brand{font-size:19px;font-weight:800;color:#0f172a}.menu{display:flex;gap:22px;flex-wrap:wrap}.menu a{color:#334155;font-size:14px}.hero{padding:72px 0 54px;background:linear-gradient(135deg,#f5f9ff 0%,#edf7ff 55%,#f8fbff 100%);border-bottom:1px solid var(--line)}.eyebrow{display:inline-block;padding:5px 10px;background:var(--soft);color:var(--brand);border-radius:999px;font-size:13px;font-weight:700}.hero h1{font-size:clamp(34px,6vw,58px);line-height:1.12;margin:18px 0 16px;letter-spacing:-.02em}.hero p{max-width:760px;color:var(--muted);font-size:17px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 18px;border-radius:10px;background:var(--brand);color:#fff;font-weight:700;border:1px solid var(--brand)}.btn.secondary{background:#fff;color:var(--brand)}section{padding:54px 0}.section-title{font-size:28px;margin:0 0 10px}.section-lead{margin:0 0 28px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow)}.card h3{margin:4px 0 8px}.card p{color:var(--muted);margin:0}.icon{width:42px;height:42px;border-radius:12px;background:var(--soft);display:grid;place-items:center;font-weight:900;color:var(--brand)}.split{display:grid;grid-template-columns:1.2fr .8fr;gap:22px}.list{padding-left:20px;color:#475569}.notice{padding:16px 18px;border-left:4px solid var(--brand);background:#f8fbff;border-radius:8px;color:#475569}.crumb{font-size:13px;color:#7c8798;padding-top:24px}.page-hero{padding:24px 0 18px}.page-hero h1{margin:8px 0 4px;font-size:34px}.tool{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow)}label{font-weight:700;font-size:14px}.input,textarea,select{width:100%;border:1px solid #cfd7e3;border-radius:10px;padding:12px 13px;font:inherit;background:#fff;color:var(--text)}textarea{min-height:180px;resize:vertical}.tool-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.result{margin-top:16px;padding:14px;border-radius:10px;background:#f7f9fc;border:1px solid var(--line);white-space:pre-wrap;word-break:break-word}.stat{display:flex;gap:14px;flex-wrap:wrap}.pill{background:#f1f5f9;padding:7px 10px;border-radius:999px;font-size:13px}.footer{margin-top:30px;background:#0f172a;color:#cbd5e1;padding:38px 0 22px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px}.footer a{color:#dbeafe}.copyright{border-top:1px solid #243047;margin-top:24px;padding-top:16px;color:#94a3b8;font-size:13px}.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#eef2f7;border:1px solid #d8dee9;padding:2px 6px;border-radius:5px}.table{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden}.table th,.table td{border:1px solid var(--line);padding:12px;text-align:left}.table th{background:#f8fafc}.badge-ok{color:var(--ok);font-weight:700}@media(max-width:800px){.grid{grid-template-columns:1fr}.split{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.nav .container{align-items:flex-start;padding:14px 0}.menu{gap:12px}.tool-row{grid-template-columns:1fr}.hero{padding-top:48px}.topbar .container{display:block}}
.section-soft{background:#eef4fb;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.card-link{display:inline-block;margin-top:14px;font-size:14px;font-weight:700;color:var(--brand)}
.card:hover{transform:translateY(-2px);transition:transform .18s ease,border-color .18s ease; border-color:#cbd9f3;text-decoration:none}
.card:hover h3{color:var(--brand)}