:root{
  --red:#D40000; --red-dark:#A80000; --ink:#14171A; --ink-2:#3D444B; --ink-3:#6B747C;
  --line:#E3E7EA; --bg:#FFFFFF; --bg-soft:#F6F8F9; --bg-dark:#0F1317;
  --max:1240px; --r:4px;
  --f-sans:"Inter","Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  --f-serif:Georgia,"Times New Roman",serif;
  --f-mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--f-sans);color:var(--ink);background:var(--bg);
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{line-height:1.22;margin:0 0 .5em;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4.2vw,3.1rem)}
h2{font-size:clamp(1.45rem,2.6vw,2.05rem)}
h3{font-size:1.18rem}
h4{font-size:1rem}
p{margin:0 0 1em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
.muted{color:var(--ink-3)}
.small{font-size:.875rem}
.lead{font-size:1.06rem;color:var(--ink-2);max-width:70ch}
.mono{font-family:var(--f-mono);font-size:.86em}
.center{text-align:center}

/* ---------- header ---------- */
.hdr{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.hdr-in{max-width:var(--max);margin:0 auto;padding:12px 22px;display:flex;
  align-items:center;gap:26px}
.logo{display:flex;align-items:center;gap:11px;flex-shrink:0}
.logo img{height:44px;width:auto}
.logo-tx b{display:block;font-family:var(--f-serif);font-size:1.12rem;letter-spacing:.06em;
  color:var(--red);line-height:1.1}
.logo-tx span{display:block;font-size:.63rem;letter-spacing:.16em;color:var(--ink-3);
  text-transform:uppercase}
.nav{margin-left:auto;display:flex;gap:2px;align-items:center}
.nav a{padding:8px 11px;font-size:.9rem;font-weight:500;color:var(--ink-2);border-radius:var(--r);
  transition:.15s}
.nav a:hover{color:var(--ink);background:var(--bg-soft)}
.nav a.on{color:var(--red);font-weight:600}
.cta{display:inline-flex;align-items:center;gap:7px;background:var(--red);color:#fff;
  padding:10px 18px;border-radius:var(--r);font-weight:600;font-size:.9rem;transition:.15s;
  border:1px solid var(--red)}
.cta:hover{background:var(--red-dark);border-color:var(--red-dark)}
.btn-ghost{display:inline-flex;align-items:center;gap:7px;padding:10px 18px;border-radius:var(--r);
  border:1px solid var(--ink);font-weight:600;font-size:.9rem;transition:.15s}
.btn-ghost:hover{background:var(--ink);color:#fff}
.burger{display:none;background:none;border:0;font-size:1.5rem;cursor:pointer;padding:6px}

/* ---------- hero ---------- */
.hero{background:linear-gradient(160deg,#101418 0%,#1B2026 55%,#2A3038 100%);color:#fff;
  padding:72px 0 62px;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;inset:0;
  background:radial-gradient(900px 380px at 82% -12%,rgba(212,0,0,.30),transparent 62%);
  pointer-events:none}
.hero .wrap{position:relative;z-index:1}
.hero h1{color:#fff;max-width:19ch}
.hero .lead{color:#C3CBD3;max-width:64ch;font-size:1.08rem}
.eyebrow{display:inline-block;font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  font-weight:700;color:#FF6B6B;margin-bottom:14px}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.hero .cta{background:var(--red);border-color:var(--red)}
.hero .btn-ghost{border-color:#5A646E;color:#E6EAED}
.hero .btn-ghost:hover{background:#fff;color:var(--ink);border-color:#fff}
.trust{display:flex;gap:34px;flex-wrap:wrap;margin-top:44px;padding-top:26px;
  border-top:1px solid rgba(255,255,255,.14)}
.trust div b{display:block;font-size:1.45rem;color:#fff;font-weight:700;line-height:1.2}
.trust div span{font-size:.78rem;color:#98A2AC;letter-spacing:.04em}

/* ---------- section ---------- */
.sec{padding:62px 0}
.sec-soft{background:var(--bg-soft)}
.sec-dark{background:var(--bg-dark);color:#E7EBEE}
.sec-dark h2,.sec-dark h3{color:#fff}
.sec-dark .lead,.sec-dark p{color:#B3BCC4}
.hd{margin-bottom:34px;max-width:74ch}
.hd .k{font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;font-weight:700;
  color:var(--red);display:block;margin-bottom:9px}

/* ---------- grid / cards ---------- */
.g{display:grid;gap:18px}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(258px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.card{border:1px solid var(--line);border-radius:var(--r);padding:22px;background:#fff;
  transition:.18s}
.card:hover{border-color:#C2CAD1;transform:translateY(-2px);box-shadow:0 8px 22px rgba(20,23,26,.06)}
.card h3{margin-bottom:8px}
.card p{color:var(--ink-2);font-size:.93rem;margin:0}
.card .ico{width:38px;height:38px;border-radius:var(--r);background:#FDECEC;color:var(--red);
  display:grid;place-items:center;font-weight:700;font-size:.82rem;margin-bottom:13px}
.card-lnk{display:inline-flex;align-items:center;gap:6px;margin-top:13px;font-size:.86rem;
  font-weight:600;color:var(--red)}

/* ---------- tables ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:#fff}
table{width:100%;border-collapse:collapse;font-size:.9rem;min-width:420px}
th,td{padding:10px 13px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:var(--bg-soft);font-weight:700;font-size:.78rem;letter-spacing:.05em;
  text-transform:uppercase;color:var(--ink-2);white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:#FAFBFC}
td.num{font-family:var(--f-mono);text-align:right;white-space:nowrap}
.tbl-cap{font-size:.83rem;color:var(--ink-3);margin-top:9px}

/* ---------- alloy page ---------- */
.spec{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);
  border-radius:var(--r);overflow:hidden;background:#fff}
.spec div{padding:13px 15px;border-bottom:1px solid var(--line)}
.spec div:nth-child(odd){background:var(--bg-soft);font-weight:600}
.spec div:nth-child(even){font-family:var(--f-mono);font-size:.86rem}
@media(max-width:640px){.spec{grid-template-columns:1fr}
  .spec div:nth-child(odd){border-bottom:0;padding-bottom:2px}
  .spec div:nth-child(even){padding-top:2px}}
.alias{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 22px;padding:0;list-style:none}
.alias li{font-family:var(--f-mono);font-size:.8rem;background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.20);color:#E2E7EB;padding:5px 11px;border-radius:2px;
  line-height:1.4}
.alias li:hover{border-color:#FF6B6B;color:#fff}
.badge{display:inline-block;font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;
  font-weight:700;padding:3px 9px;border-radius:2px;background:#FDECEC;color:var(--red)}
.badge-ok{background:#E7F5EC;color:#1B7F3B}
.prose{max-width:78ch}
.prose h3{margin-top:1.8em}
.faq-item{border-bottom:1px solid var(--line);padding:16px 0}
.faq-item h3{font-size:1rem;margin:0 0 6px}
.faq-item p{margin:0;color:var(--ink-2);font-size:.94rem}

/* ---------- forms ---------- */
.field{margin-bottom:16px}
.field label{display:block;font-size:.82rem;font-weight:600;margin-bottom:6px;color:var(--ink-2)}
.field input,.field select,.field textarea{width:100%;padding:10px 12px;border:1px solid #C9D0D6;
  border-radius:var(--r);font:inherit;font-size:.93rem;background:#fff;transition:.15s}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;
  border-color:var(--red);box-shadow:0 0 0 3px rgba(212,0,0,.10)}
.field textarea{min-height:118px;resize:vertical}
.req{color:var(--red)}
.form-2{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
@media(max-width:640px){.form-2{grid-template-columns:1fr}}
.form-note{font-size:.83rem;color:var(--ink-3);margin-top:12px}

/* ---------- footer ---------- */
.ftr{background:var(--bg-dark);color:#98A2AC;padding:52px 0 26px;font-size:.9rem}
.ftr-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px}
@media(max-width:900px){.ftr-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.ftr-grid{grid-template-columns:1fr}}
.ftr h4{color:#fff;font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;margin-bottom:15px}
.ftr a{color:#98A2AC;display:block;padding:3px 0;transition:.15s}
.ftr a:hover{color:#fff}
.ftr-logo{display:flex;align-items:center;gap:11px;margin-bottom:14px}
.ftr-logo img{height:42px}
.ftr-logo b{font-family:var(--f-serif);color:#fff;font-size:1.05rem;letter-spacing:.06em;
  display:block;line-height:1.15}
.ftr-bot{margin-top:38px;padding-top:20px;border-top:1px solid rgba(255,255,255,.11);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:.83rem}

/* ---------- breadcrumbs ---------- */
.crumb{font-size:.81rem;color:var(--ink-3);padding:14px 0 0}
.crumb a:hover{color:var(--red)}
.crumb span{opacity:.55;margin:0 7px}

/* ---------- misc ---------- */
.notice{border-left:3px solid var(--red);background:#FDF6F6;padding:14px 17px;
  border-radius:0 var(--r) var(--r) 0;font-size:.92rem;color:var(--ink-2)}
.checklist{list-style:none;padding:0;margin:0}
.checklist li{padding-left:26px;position:relative;margin-bottom:9px;color:var(--ink-2)}
.checklist li:before{content:"✓";position:absolute;left:0;color:var(--red);font-weight:700}
.tagrow{display:flex;flex-wrap:wrap;gap:8px}
.tag{font-size:.79rem;padding:5px 11px;background:var(--bg-soft);border:1px solid var(--line);
  border-radius:2px;font-family:var(--f-mono)}
.tag:hover{border-color:var(--red);color:var(--red)}
.stat{text-align:center;padding:22px 12px;border:1px solid var(--line);border-radius:var(--r)}
.stat b{display:block;font-size:1.85rem;color:var(--red);font-weight:700;line-height:1.15}
.stat span{font-size:.82rem;color:var(--ink-3)}
@media(max-width:860px){
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:10px 16px}
  .nav.open{display:flex}
  .nav a{padding:11px 8px}
  .burger{display:block;margin-left:auto;order:3}
  .hdr .cta{margin-left:auto;order:2;padding:9px 14px;font-size:.84rem;white-space:nowrap}
}
@media(max-width:520px){
  .hdr-in{gap:12px;padding:10px 16px}
  .logo img{height:36px;width:36px}
  .logo-tx b{font-size:.95rem}
  .logo-tx span{font-size:.55rem;letter-spacing:.12em}
  .hdr .cta{padding:8px 12px;font-size:.78rem}
  .burger{font-size:1.35rem;padding:4px 2px}
  .trust{gap:22px}
  .trust div b{font-size:1.25rem}
}