:root{
  --ink:#0f172a; --muted:#64748b; --line:#e2e8f0; --bg:#f6f8fb; --surface:#fff;
  --brand:#0b5fff; --brand-dk:#0847c4; --cyan:#06b6d4; --warm:#f97316;
  --radius:14px; --shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.06);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px}

/* header */
.hd{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.hd-in{display:flex;align-items:center;gap:28px;height:66px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:700}
.brand:hover{text-decoration:none}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--brand),var(--cyan));color:#fff;font-size:13px;letter-spacing:.5px}
.brand-txt{display:flex;flex-direction:column;line-height:1.15;font-size:16px}
.brand-txt em{font-style:normal;font-size:11px;color:var(--muted);font-weight:500}
.nav{display:flex;gap:22px;margin-left:auto}
.nav a{color:#334155;font-size:15px}
.nav a.on{color:var(--brand);font-weight:600}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:10px;
  background:var(--brand);color:#fff;font-weight:600;border:1px solid transparent;transition:.18s;cursor:pointer}
.btn:hover{background:var(--brand-dk);text-decoration:none;transform:translateY(-1px)}
.btn-sm{padding:9px 16px;font-size:14px}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{background:#f8fafc;color:var(--ink)}
.btn-warm{background:var(--warm)}
.btn-warm:hover{background:#ea580c}

/* hero */
.hero{position:relative;overflow:hidden;padding:78px 0 64px;border-bottom:1px solid var(--line);
  background:
    radial-gradient(900px 340px at 12% -10%,rgba(11,95,255,.10),transparent 65%),
    radial-gradient(700px 300px at 88% 0%,rgba(6,182,212,.12),transparent 60%),
    #fff;}
.hero:after{content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:44px 44px;mask-image:radial-gradient(circle at 50% 30%,#000,transparent 72%)}
.hero-in{position:relative;z-index:1;max-width:820px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;
  background:rgba(11,95,255,.08);color:var(--brand);font-size:13px;font-weight:600}
h1{font-size:46px;line-height:1.18;letter-spacing:-.02em;margin:18px 0 14px}
.lead{font-size:18px;color:#475569;margin:0 0 26px;max-width:680px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{display:flex;gap:40px;margin-top:44px;flex-wrap:wrap}
.stat b{display:block;font-size:26px;letter-spacing:-.02em}
.stat span{font-size:13px;color:var(--muted)}

/* sections */
.sec{padding:64px 0}
.sec-h{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:28px}
.sec-h h2{font-size:28px;margin:0;letter-spacing:-.01em}
.sec-h p{margin:6px 0 0;color:var(--muted)}
.more{font-size:14px;color:var(--muted)}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.2s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.card h3{margin:0 0 8px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:14.5px}
.card .tag{display:inline-block;margin-bottom:12px;font-size:12px;font-weight:700;color:var(--brand);
  background:rgba(11,95,255,.08);padding:4px 9px;border-radius:6px;letter-spacing:.4px}
.card ul{margin:12px 0 0;padding-left:18px;color:#475569;font-size:14px}
.card li{margin:4px 0}

/* post list */
.plist{display:grid;gap:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.pitem{display:block;padding:22px 24px;border-bottom:1px solid var(--line);color:inherit}
.pitem:last-child{border-bottom:0}
.pitem:hover{background:#fafbff;text-decoration:none}
.pitem h3{margin:0 0 6px;font-size:17.5px;line-height:1.45}
.pitem p{margin:0;color:var(--muted);font-size:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.pmeta{display:flex;gap:14px;font-size:12.5px;color:#94a3b8;margin-top:8px}
.pmeta .cat{color:var(--brand);font-weight:600}

/* chips */
.chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{padding:9px 15px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#334155;font-size:14px}
.chip b{color:var(--brand);margin-left:6px;font-size:12px}
.chip:hover{border-color:#c7d2fe;text-decoration:none}

/* prose */
.prose{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:40px 44px}
.prose h1{font-size:34px;margin:0 0 10px}
.prose .meta{color:#94a3b8;font-size:13.5px;margin-bottom:26px;display:flex;gap:14px;flex-wrap:wrap}
.prose h2{font-size:23px;margin:34px 0 12px;letter-spacing:-.01em}
.prose h3{font-size:19px;margin:26px 0 10px}
.prose p{margin:14px 0}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin:6px 0}
.prose blockquote{margin:20px 0;padding:14px 18px;border-left:3px solid var(--brand);background:#f8faff;color:#334155}
.prose img{border-radius:10px;margin:16px 0}
.prose code{background:#f1f5f9;padding:2px 6px;border-radius:5px;font-size:.9em}
.prose table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:#f8fafc}

/* table */
.tbl{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:14.5px}
.tbl th,.tbl td{padding:13px 16px;border-bottom:1px solid var(--line);text-align:left}
.tbl th{background:#f8fafc;font-size:13px;color:#475569;font-weight:600}
.tbl tr:last-child td{border-bottom:0}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:s}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:relative}
.step:before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:28px;height:28px;border-radius:8px;
  background:var(--brand);color:#fff;font-size:13px;font-weight:700;margin-bottom:12px}
.step h3{margin:0 0 6px;font-size:16px}
.step p{margin:0;color:var(--muted);font-size:14px}

/* form */
.form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.fgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:7px}
.field.full{grid-column:1/-1}
.field label{font-size:13.5px;font-weight:600;color:#334155}
.field input,.field select,.field textarea{
  padding:11px 13px;border:1px solid #cbd5e1;border-radius:9px;font:inherit;font-size:14.5px;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(11,95,255,.12)}
.field small{color:#94a3b8;font-size:12.5px}
.file{display:block;border:2px dashed #cbd5e1;border-radius:12px;padding:30px 24px;text-align:center;background:#fafbff;cursor:pointer;transition:.18s}
.file:hover{border-color:var(--brand);background:#f5f8ff}
.file input{display:none}
.file b{display:block;margin-bottom:6px;font-size:15px}
.file span{color:var(--muted);font-size:13px}
.form-note{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;padding:12px 14px;border-radius:10px;font-size:14px;margin-bottom:18px}
.form-actions{display:flex;align-items:center;gap:16px;margin-top:22px;flex-wrap:wrap}
.form-actions small{color:var(--muted)}

/* callout */
.callout{background:linear-gradient(135deg,#0b1b3f,#122b63);color:#e2e8f0;border-radius:18px;padding:38px 40px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.callout h2{margin:0 0 6px;font-size:24px;color:#fff}
.callout p{margin:0;color:#a9b8d4}

/* faq */
.faq{display:grid;gap:14px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 20px}
.faq summary{cursor:pointer;font-weight:600}
.faq p{margin:10px 0 0;color:var(--muted);font-size:14.5px}

/* footer */
.ft{background:#0b1220;color:#94a3b8;margin-top:70px;padding:52px 0 26px}
.ft-in{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px}
.ft-brand{color:#fff;font-size:18px;font-weight:700;margin-bottom:10px}
.ft-desc{margin:0;font-size:13.5px;line-height:1.8;color:#7c8aa5}
.ft-h{color:#cbd5e1;font-size:13px;font-weight:700;margin-bottom:12px;letter-spacing:.5px}
.ft-col a{display:block;color:#94a3b8;font-size:13.5px;margin:7px 0}
.ft-col a:hover{color:#fff}
.ft-legal{display:flex;justify-content:space-between;gap:16px;border-top:1px solid #1e293b;margin-top:34px;padding-top:18px;font-size:12.5px;color:#64748b;flex-wrap:wrap}
.ft-legal a{color:#64748b}

/* pagination */
.pager{display:flex;gap:8px;justify-content:center;margin-top:28px}
.pager a,.pager span{padding:8px 13px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:14px;color:#475569}
.pager .cur{background:var(--brand);color:#fff;border-color:var(--brand)}

/* admin */
.admin{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;overflow:auto}
.admin table{width:100%;border-collapse:collapse;font-size:13.5px;min-width:900px}
.admin th,.admin td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}
.admin th{background:#f8fafc;font-size:12.5px;color:#475569}
.badge{display:inline-block;padding:2px 8px;border-radius:6px;font-size:12px;background:#eef2ff;color:#3730a3}
.badge.new{background:#fef3c7;color:#92400e}
.badge.done{background:#dcfce7;color:#166534}

/* 404 / thanks */
.center{min-height:52vh;display:grid;place-items:center;text-align:center;padding:60px 0}
.center h1{font-size:60px;margin:0 0 8px;color:var(--brand)}
.center p{color:var(--muted);margin:0 0 22px}
.qbox{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;max-width:620px;margin:0 auto}
.qprice{font-size:38px;font-weight:700;color:var(--brand);letter-spacing:-.02em}

@media (max-width:900px){
  h1{font-size:34px}
  .cards,.steps{grid-template-columns:1fr 1fr}
  .ft-in{grid-template-columns:1fr 1fr}
  .fgrid{grid-template-columns:1fr}
  .prose{padding:26px 22px}
  .nav{display:none}
}
@media (max-width:560px){
  .cards,.steps,.ft-in{grid-template-columns:1fr}
  .hero{padding:52px 0 44px}
  h1{font-size:29px}
  .hero-stats{gap:24px}
  .stat b{font-size:22px}
}