:root{--blue:#2563eb;--blue-d:#1d4ed8;--ink:#111827;--muted:#6b7280;--line:#e5e7eb;--bg:#f8fafc;--card:#fff;--green:#16a34a;--red:#dc2626;--amber:#d97706;--radius:12px}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
header.site{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}
.logo{font-weight:800;font-size:20px;color:var(--ink);white-space:nowrap}
.logo span{color:var(--blue)}
.nav-links{display:flex;gap:18px;font-size:15px;flex-wrap:wrap}
.nav-links a{color:#374151}
.hero{background:linear-gradient(135deg,#2563eb,#7c3aed);color:#fff;padding:56px 0 48px;text-align:center}
.hero h1{font-size:34px;line-height:1.3;margin:0 0 12px}
.hero p{opacity:.92;max-width:720px;margin:0 auto 24px;font-size:17px}
.search-box{max-width:560px;margin:0 auto;display:flex;background:#fff;border-radius:999px;padding:6px;box-shadow:0 8px 30px rgba(0,0,0,.18)}
.search-box input{flex:1;border:0;outline:0;padding:10px 16px;font-size:16px;border-radius:999px;min-width:0}
.search-box button{border:0;background:var(--blue);color:#fff;border-radius:999px;padding:10px 22px;font-size:15px;cursor:pointer;white-space:nowrap}
.search-box button:hover{background:var(--blue-d)}
.cats{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin:26px 0 8px}
.cat-btn{border:1px solid var(--line);background:#fff;padding:7px 16px;border-radius:999px;cursor:pointer;font-size:14px}
.cat-btn.active,.cat-btn:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:24px 0 40px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;display:block;color:var(--ink)}
.card:hover{border-color:var(--blue);box-shadow:0 6px 24px rgba(37,99,235,.12);text-decoration:none;transform:translateY(-2px)}
.card .icon{font-size:30px;line-height:1;margin-bottom:10px}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:14px;line-height:1.6}
.tag{display:inline-block;background:#eff6ff;color:var(--blue);font-size:12px;padding:2px 9px;border-radius:999px;margin-bottom:10px}
.section{margin:36px 0}
.section h2{font-size:24px;margin:0 0 10px}
.tool-wrap{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;margin:22px 0}
.tool-wrap h1{font-size:28px;margin:0 0 8px;line-height:1.4}
.lead{color:var(--muted);margin:0 0 18px}
.intro{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:18px 20px;margin:18px 0;font-size:15px;color:#374151}
.intro h2{font-size:18px;margin:0 0 8px}
label{display:block;font-weight:600;margin:14px 0 6px;font-size:15px}
textarea,input[type=text],input[type=number],input[type=date],select{width:100%;border:1px solid #d1d5db;border-radius:8px;padding:11px 12px;font-size:15px;font-family:inherit;background:#fff}
textarea{min-height:150px;resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:14px;line-height:1.6}
textarea.small{min-height:90px}
input[type=range]{width:100%}
.btn{display:inline-block;border:0;background:var(--blue);color:#fff;padding:10px 20px;border-radius:8px;font-size:15px;cursor:pointer;margin:6px 8px 6px 0}
.btn:hover{background:var(--blue-d)}
.btn.secondary{background:#fff;color:var(--ink);border:1px solid #d1d5db}
.btn.secondary:hover{background:#f3f4f6}
.btn.green{background:var(--green)}
.btn:disabled{opacity:.55;cursor:not-allowed}
.row{display:flex;gap:14px;flex-wrap:wrap}
.row>*{flex:1;min-width:220px}
.checks{display:flex;gap:16px;flex-wrap:wrap;margin:8px 0}
.checks label{display:inline-flex;align-items:center;gap:6px;font-weight:400;margin:0}
.result{margin-top:16px}
.status{margin-top:10px;font-size:14px;color:var(--green);min-height:20px}
.status.error{color:var(--red)}
pre.output{background:#111827;color:#e5e7eb;padding:16px;border-radius:8px;overflow:auto;white-space:pre-wrap;word-break:break-all;font-size:14px;line-height:1.6;min-height:60px}
.output-box{background:#f9fafb;border:1px solid var(--line);border-radius:8px;padding:14px;word-break:break-all;min-height:48px}
table{width:100%;border-collapse:collapse;font-size:14px;margin-top:12px}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:right}
th{background:#f9fafb;text-align:right}
th:first-child,td:first-child{text-align:center}
.kv{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:16px 0}
.kv div{background:#eff6ff;border-radius:8px;padding:14px}
.kv b{display:block;font-size:20px;color:var(--blue)}
.kv span{font-size:13px;color:var(--muted)}
.color-preview{height:90px;border-radius:10px;border:1px solid var(--line);margin:12px 0;display:flex;align-items:center;justify-content:center;font-weight:700;background:#2563eb;color:#fff}
.match{background:#fde68a;padding:1px 2px;border-radius:3px}
.breadcrumb{font-size:14px;color:var(--muted);margin:18px 0 0}
.breadcrumb a{color:var(--muted)}
.related{margin:28px 0}
.related a{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 14px;margin:0 8px 8px 0;color:var(--ink);font-size:14px}
footer.site{background:#111827;color:#9ca3af;padding:36px 0;margin-top:48px;font-size:14px}
footer.site a{color:#d1d5db}
footer.site h3{color:#fff;margin:0 0 10px;font-size:16px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px}
.faq h3{font-size:17px;margin:18px 0 6px}
.no-result{display:none;text-align:center;color:var(--muted);padding:30px}
@media(max-width:760px){.grid{grid-template-columns:1fr}.hero h1{font-size:26px}.foot-grid{grid-template-columns:1fr}.kv{grid-template-columns:1fr}.tool-wrap{padding:18px}.nav-links{display:none}}