:root{
  --bg:#f6f8fc; --text:#0d1b2a; --muted:#5d6b7a; --card:#fff; --border:#e7eef6;
  --brand:#2c7be5; --brand2:#00b3c7; --btn:#1a73e8; --btn2:#1558b0;
  --shadow:0 10px 24px rgba(13,27,42,.08); --radius:18px; --radius2:14px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;
  --sans:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif;
}
*{box-sizing:border-box} html,body{height:100%}
body{margin:0;font-family:var(--sans);color:var(--text);background:var(--bg)}
a{color:var(--btn);text-decoration:none} a:hover{text-decoration:underline}
.container{width:min(1100px,92vw);margin:0 auto}
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;padding:16px 0;gap:12px}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-size:18px}
.brand-name{font-weight:800;letter-spacing:.2px}
.brand-sub{font-size:12px;color:var(--muted);margin-top:2px}
.nav{display:flex;gap:14px;flex-wrap:wrap;justify-content:flex-end}
.nav a{color:#123;opacity:.85;font-weight:600;font-size:14px}
.nav a:hover{opacity:1}
.hero{background:linear-gradient(135deg,#e9f4ff,#f4feff);border-bottom:1px solid var(--border)}
.hero-inner{padding:42px 0;display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:start}
h1{margin:0 0 10px;font-size:34px;letter-spacing:-.6px}
.muted{color:var(--muted);line-height:1.5}
.steps{display:flex;gap:12px;margin-top:16px;flex-wrap:wrap}
.step{padding:10px 12px;border:1px solid var(--border);border-radius:999px;background:rgba(255,255,255,.7);font-size:13px;color:#203046}
.badge{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:999px;background:#eaf2ff;color:var(--btn);font-weight:800;margin-right:8px;font-size:12px}
.hero-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.rate-line{display:flex;justify-content:flex-end;font-size:14px;color:#27415a;margin-bottom:14px}
.rate-left{font-family:var(--mono);opacity:.85}
.id-row{display:flex;gap:12px;align-items:stretch}
#bigo-id{flex:1;border:1px solid var(--border);border-radius:var(--radius2);padding:14px 14px;font-size:16px;outline:none}
#bigo-id:focus{border-color:#b9d6ff;box-shadow:0 0 0 4px rgba(26,115,232,.12)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 16px;border-radius:14px;border:1px solid transparent;font-weight:800;cursor:pointer;user-select:none}
.btn.primary{background:linear-gradient(180deg,var(--btn),var(--btn2));color:#fff}
.btn.primary:hover{filter:brightness(1.02)}
.btn[aria-disabled="true"]{opacity:.55;pointer-events:none}
.options{margin-top:16px}
.options-title{font-weight:800;margin-bottom:10px}
.diamond-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.diamond-grid.prices-hidden .d-price{display:none}
.diamond-item input{display:none}
.diamond-item label{display:block;border:1px solid var(--border);border-radius:16px;padding:12px;background:#f9fcff;cursor:pointer;min-height:64px}
.diamond-item label:hover{border-color:#cfe4ff}
.diamond-item input:checked+label{border-color:#85b7ff;box-shadow:0 0 0 4px rgba(26,115,232,.10);background:#fff}
.d-qty{font-weight:900}
.d-price{margin-top:6px;font-family:var(--mono);font-size:14px;color:#24435f;min-height:18px}
.custom-row{margin-top:10px;display:flex;gap:8px;align-items:center}
.custom-input{width:100%;border:1px solid var(--border);border-radius:12px;padding:10px 12px;outline:none}
.custom-input:focus{border-color:#b9d6ff;box-shadow:0 0 0 4px rgba(26,115,232,.10)}
.unit{font-family:var(--mono);opacity:.7}
.cta-row{margin-top:14px;display:flex;flex-direction:column;gap:8px}
.hint{color:var(--muted);font-size:13px}
.info{padding:26px 0 46px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:0 8px 20px rgba(13,27,42,.05)}
.card h3{margin:0 0 8px}
.page{padding:24px 0 52px}
.page-inner h1{font-size:28px;margin-bottom:14px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:10px}
.pill{border:1px solid var(--border);border-radius:16px;padding:12px;background:#fbfdff}
.pill-title{font-weight:900;margin-bottom:6px}
.hr{height:1px;background:var(--border);margin:14px 0}
.kv{display:grid;grid-template-columns:180px 1fr;gap:8px 12px}
.k{color:var(--muted);font-size:13px}
.v{font-family:var(--mono);font-size:14px;color:#172a3a}
.legal p,.legal li{line-height:1.55}
.legal h3{margin:18px 0 8px}
.footer{background:#0b2239;color:rgba(255,255,255,.92);padding:22px 0}
.footer a{color:rgba(255,255,255,.92)}
.footer-inner{display:grid;grid-template-columns:1.1fr .9fr 1fr;gap:18px}
.footer-title{font-weight:900;margin-bottom:8px}
.fineprint{margin-top:14px;font-size:12px;opacity:.85}
.footer.slim{padding:14px 0}
.logos{display:flex;gap:10px;margin-top:10px;align-items:center}
.logo{height:24px;width:auto;filter:brightness(0) invert(1);opacity:.9}
@media (max-width:980px){
  .hero-inner{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr}
  .diamond-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:1fr}
  .kv{grid-template-columns:1fr}
}