:root{
    --jade-deep:#1F3D2E; --jade-deeper:#152A20; --jade-light:#7FA383; --jade-pale:#C9D9C7;
    --stone:#EDEAE0; --stone-dim:#DFDACB; --gold:#A8874F; --gold-bright:#C9A45E;
    --ink:#161913; --white:#FBFAF6;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  @media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto;} *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;} }
  body{ margin:0; background:var(--stone); color:var(--ink); font-family:'Source Serif 4', serif; font-size:17px; line-height:1.65; -webkit-font-smoothing:antialiased; }
  body.lang-zh{ font-family:'Noto Serif SC', serif; }
  .zh{ font-family:'Noto Serif SC', serif; }
  h1,h2,h3,.display{ font-family:'Fraunces', serif; font-weight:500; letter-spacing:-0.01em; margin:0; }
  body.lang-zh h1, body.lang-zh h2, body.lang-zh h3{ font-family:'Noto Serif SC', serif; font-weight:600; }
  .eyebrow{ font-family:'Inter', sans-serif; font-size:12px; font-weight:600; letter-spacing:0.16em; text-transform:uppercase; color:var(--gold); }
  body.lang-zh .eyebrow{ letter-spacing:0.05em; }
  a{color:inherit;} img{max-width:100%;display:block;}
  .wrap{max-width:1180px;margin:0 auto;padding:0 32px;}
  @media (max-width:640px){ .wrap{padding:0 20px;} }
  a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{ outline:2px solid var(--gold-bright); outline-offset:3px; }

  .nav{ position:fixed; top:0; left:0; right:0; z-index:50; display:flex; align-items:center; justify-content:space-between; padding:20px 32px; background:rgba(237,234,224,0.86); backdrop-filter:blur(10px); border-bottom:1px solid rgba(22,25,19,0.08); }
  .nav.on-dark{ background:rgba(21,42,32,0.55); border-bottom:1px solid rgba(255,255,255,0.08); }
  .nav.on-dark .nav-mark, .nav.on-dark .nav-links a, .nav.on-dark .lang-toggle button{ color:var(--white); }
  .nav-mark{ font-family:'Fraunces',serif; font-weight:500; font-size:19px; letter-spacing:0.01em; text-decoration:none; color:var(--ink); display:flex; gap:10px; align-items:baseline;}
  .nav-mark .zh{font-size:15px; color:var(--gold);}
  .nav-links{ display:flex; gap:34px; list-style:none; margin:0; padding:0; font-family:'Inter',sans-serif; font-size:13px; letter-spacing:0.04em; }
  .nav-links li{ margin-right:34px; } .nav-links li:last-child{ margin-right:0; }
  .nav-links a{ text-decoration:none; color:var(--ink); opacity:0.8; transition:opacity .2s; }
  .nav-links a:hover{ opacity:1; }
  .nav-right{ display:flex; align-items:center; gap:18px; }
  .lang-toggle{ display:flex; align-items:center; font-family:'Inter',sans-serif; font-size:13px; font-weight:600; border:1px solid rgba(168,135,79,0.5); border-radius:20px; overflow:hidden; }
  .lang-toggle button{ background:none; border:none; padding:6px 14px; cursor:pointer; color:var(--ink); opacity:0.6; font-family:'Inter',sans-serif; font-size:13px; font-weight:600; }
  .lang-toggle button.active{ background:var(--gold); color:var(--jade-deeper); opacity:1; }
  .nav-cta{ font-family:'Inter',sans-serif; font-size:13px; font-weight:600; border:1px solid var(--gold); color:var(--gold) !important; opacity:1 !important; padding:8px 18px; border-radius:2px; text-decoration:none; }
  .nav.on-dark .nav-cta{ color:var(--gold-bright) !important; border-color:var(--gold-bright); }
  @media (max-width:860px){ .nav-links{display:none;} }

  .hero{ position:relative; min-height:100vh; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; background:radial-gradient(120% 90% at 50% 0%, var(--jade-deep) 0%, var(--jade-deeper) 62%, #0E1C15 100%); color:var(--white); overflow:hidden; padding:120px 24px 80px; }
  .hero-veins{ position:absolute; inset:0; opacity:0.55; }
  .hero-veins svg{ width:100%; height:100%; }
  .hero-veins path{ stroke:var(--jade-pale); stroke-width:0.8; fill:none; opacity:0.45; }
  .hero-veins path.slow{ animation:drift 34s ease-in-out infinite; }
  @keyframes drift{ 0%,100%{ transform:translateY(0) scale(1); } 50%{ transform:translateY(-14px) scale(1.01); } }
  .hero-content{ position:relative; z-index:2; max-width:760px; }
  .hero-eyebrow{ font-family:'Inter',sans-serif; font-size:12px; letter-spacing:0.22em; text-transform:uppercase; color:var(--gold-bright); margin-bottom:26px; opacity:0; animation:fadeUp .9s ease forwards .2s; }
  .hero-mark{ font-size:clamp(42px,7vw,84px); line-height:1.02; font-weight:500; opacity:0; animation:fadeUp 1s ease forwards .4s; }
  .hero-mark .zh{ display:block; font-size:0.42em; color:var(--jade-pale); margin-top:14px; font-weight:400; letter-spacing:0.04em; }
  .hero-tagline{ margin-top:30px; font-family:'Source Serif 4',serif; font-size:19px; color:rgba(251,250,246,0.82); max-width:520px; margin-left:auto; margin-right:auto; opacity:0; animation:fadeUp 1s ease forwards .65s; }
  body.lang-zh .hero-tagline{ font-family:'Noto Serif SC',serif; font-size:18px; }
  .hero-cta-row{ margin-top:44px; display:flex; gap:18px; justify-content:center; flex-wrap:wrap; opacity:0; animation:fadeUp 1s ease forwards .9s; }
  .btn{ font-family:'Inter',sans-serif; font-size:13px; font-weight:600; letter-spacing:0.03em; padding:14px 30px; border-radius:2px; text-decoration:none; display:inline-block; transition:all .25s; cursor:pointer; }
  body.lang-zh .btn{ font-family:'Noto Serif SC',sans-serif; }
  .btn-primary{ background:var(--gold); color:var(--jade-deeper); border:none; }
  .btn-primary:hover{ background:var(--gold-bright); }
  .btn-ghost{ border:1px solid rgba(251,250,246,0.4); color:var(--white); background:none; }
  .btn-ghost:hover{ border-color:var(--white); }
  @keyframes fadeUp{ from{ opacity:0; transform:translateY(16px); } to{ opacity:1; transform:translateY(0); } }
  .scroll-cue{ position:absolute; bottom:34px; left:50%; transform:translateX(-50%); width:1px; height:44px; background:linear-gradient(var(--gold-bright), transparent); opacity:0.6; }

  section{ padding:120px 0; } @media (max-width:640px){ section{ padding:80px 0; } }
  .section-head{ max-width:640px; margin-bottom:56px; }
  .section-head h2{ font-size:clamp(30px,4vw,44px); margin-top:14px; }

  .provenance{ background:var(--stone); }
  .prov-grid{ display:grid; grid-template-columns: 1.1fr 0.9fr; gap:80px; align-items:start; }
  @media (max-width:900px){ .prov-grid{ grid-template-columns:1fr; gap:48px; } }
  .prov-copy p{ margin:0 0 20px; color:#2b2f27; }
  .prov-figure{ background:var(--jade-deep); border-radius:2px; padding:44px 38px; color:var(--white); position:relative; overflow:hidden; }
  .prov-figure::before{ content:""; position:absolute; inset:0; background: radial-gradient(circle at 20% 20%, rgba(255,255,255,0.05), transparent 40%), radial-gradient(circle at 80% 70%, rgba(255,255,255,0.04), transparent 45%); }
  .prov-quote{ font-family:'Fraunces',serif; font-size:26px; line-height:1.4; position:relative; z-index:1; }
  body.lang-zh .prov-quote{ font-family:'Noto Serif SC',serif; font-size:23px; }
  .prov-quote .zh{ display:block; margin-top:16px; font-size:16px; color:var(--jade-pale); }
  .prov-stats{ margin-top:36px; display:grid; grid-template-columns:1fr 1fr; gap:24px; position:relative; z-index:1; }
  .prov-stat b{ display:block; font-family:'Fraunces',serif; font-size:26px; color:var(--gold-bright); font-weight:500; }
  .prov-stat span{ font-family:'Inter',sans-serif; font-size:12px; letter-spacing:0.03em; color:rgba(251,250,246,0.7); }
  body.lang-zh .prov-stat span{ font-family:'Noto Serif SC',sans-serif; letter-spacing:0; }

  .gallery{ background:var(--jade-deeper); color:var(--white); }
  .gallery .section-head p{ color:rgba(251,250,246,0.72); margin-top:16px; max-width:600px; }
  .gallery-layout{ display:grid; grid-template-columns:1.1fr 1fr; gap:26px; }
  @media (max-width:860px){ .gallery-layout{ grid-template-columns:1fr; } }
  .gallery-feature{ position:relative; border-radius:3px; overflow:hidden; background:#0E1C15; }
  .gallery-feature img{ width:100%; height:100%; object-fit:contain; display:block; min-height:340px; background:#0E1C15; }
  .gallery-feature-cap{ position:absolute; left:0; right:0; bottom:0; padding:20px 22px; background:linear-gradient(to top, rgba(14,28,21,0.92), transparent); }
  .gallery-feature-cap .eyebrow{ color:var(--gold-bright); }
  .gallery-feature-cap p{ margin:6px 0 0; font-family:'Source Serif 4',serif; font-size:15px; color:rgba(251,250,246,0.88); }
  .gallery-grid{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
  .gallery-grid figure{ margin:0; border-radius:3px; overflow:hidden; background:#0E1C15; aspect-ratio:4/3; }
  .gallery-grid img{ width:100%; height:100%; object-fit:cover; display:block; transition:transform .5s ease; }
  .gallery-grid figure:hover img{ transform:scale(1.05); }
  .gallery-note{ margin-top:28px; font-family:'Inter',sans-serif; font-size:12.5px; color:rgba(251,250,246,0.5); }

  .windowing{ background:var(--jade-deeper); color:var(--white); }
  .windowing .section-head .eyebrow{ color:var(--gold-bright); }
  .windowing .section-head p{ color:rgba(251,250,246,0.72); margin-top:16px; max-width:600px; }
  .window-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:22px; }
  @media (max-width:940px){ .window-grid{ grid-template-columns:repeat(2,1fr);} }
  @media (max-width:520px){ .window-grid{ grid-template-columns:1fr;} }
  .stone-card{ position:relative; aspect-ratio:3/4; border-radius:3px; cursor:pointer; background:linear-gradient(155deg,#2A4A38,#193225 60%,#122419); overflow:hidden; border:1px solid rgba(255,255,255,0.08); isolation:isolate; }
  .stone-card:focus-visible{ outline:2px solid var(--gold-bright); outline-offset:3px; }
  .stone-rough{ position:absolute; inset:0; display:flex; flex-direction:column; justify-content:flex-end; padding:20px; background: radial-gradient(120% 90% at 30% 20%, rgba(255,255,255,0.06), transparent 55%), radial-gradient(90% 70% at 75% 80%, rgba(0,0,0,0.35), transparent 60%); transition:opacity .5s ease; }
  .stone-rough .tag{ font-family:'Inter',sans-serif; font-size:11px; letter-spacing:0.1em; text-transform:uppercase; color:rgba(251,250,246,0.55); }
  .stone-rough .hint{ font-family:'Source Serif 4',serif; font-size:14px; color:rgba(251,250,246,0.8); margin-top:6px; }
  body.lang-zh .stone-rough .hint{ font-family:'Noto Serif SC',serif; }
  .window-pane{ position:absolute; left:50%; top:50%; transform:translate(-50%,-50%); width:0; height:0; border-radius:50%; opacity:0; background:radial-gradient(circle at 35% 30%, var(--reveal-c1,#9CC49E), var(--reveal-c2,#4B7A55) 70%); box-shadow:inset 0 0 30px rgba(0,0,0,0.35), 0 0 0 6px rgba(251,250,246,0.06); transition:width .55s cubic-bezier(.2,.8,.2,1), height .55s cubic-bezier(.2,.8,.2,1), opacity .1s linear; }
  .stone-card.open .window-pane{ width:150%; height:150%; opacity:1; }
  .stone-card.open .stone-rough{ opacity:0; }
  .stone-info{ position:absolute; inset:0; display:flex; flex-direction:column; justify-content:flex-end; padding:20px; opacity:0; transition:opacity .4s ease .15s; z-index:2; }
  .stone-card.open .stone-info{ opacity:1; }
  .stone-info .grade{ font-family:'Fraunces',serif; font-size:30px; color:var(--jade-deeper); font-weight:600; }
  .stone-info .desc{ font-family:'Inter',sans-serif; font-size:12px; color:rgba(22,25,19,0.75); margin-top:4px; line-height:1.5; }
  body.lang-zh .stone-info .desc{ font-family:'Noto Serif SC',sans-serif; }
  .window-note{ margin-top:34px; font-family:'Inter',sans-serif; font-size:13px; color:rgba(251,250,246,0.55); }

  .grading{ background:var(--stone); }
  table.grade-table{ width:100%; border-collapse:collapse; margin-top:10px; }
  .grade-table th{ font-family:'Inter',sans-serif; font-size:11px; letter-spacing:0.08em; text-transform:uppercase; text-align:left; padding:14px 16px; border-bottom:2px solid var(--jade-deep); color:var(--jade-deep); }
  body.lang-zh .grade-table th{ font-family:'Noto Serif SC',sans-serif; letter-spacing:0.02em; }
  .grade-table td{ padding:18px 16px; border-bottom:1px solid rgba(22,25,19,0.1); vertical-align:top; font-size:15.5px; }
  .grade-table tr:last-child td{ border-bottom:none; }
  .grade-pill{ display:inline-block; font-family:'Fraunces',serif; font-weight:600; font-size:15px; padding:3px 12px; border-radius:20px; background:var(--jade-deep); color:var(--white); }

  .trust{ background:var(--white); }
  .trust-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:44px; }
  @media (max-width:800px){ .trust-grid{ grid-template-columns:1fr; gap:36px; } }
  .trust-item .eyebrow{ display:block; margin-bottom:14px; }
  .trust-item h3{ font-size:21px; margin-bottom:10px; }
  .trust-item p{ color:#3a3f34; font-size:15.5px; margin:0; }

  .contact{ background:var(--jade-deep); color:var(--white); }
  .contact .section-head p{ color:rgba(251,250,246,0.75); margin-top:16px; max-width:520px; }
  .form-grid{ display:grid; grid-template-columns:1fr 1fr; gap:22px; max-width:760px; }
  @media (max-width:640px){ .form-grid{ grid-template-columns:1fr; } }
  .field{ display:flex; flex-direction:column; gap:8px; } .field.full{ grid-column:1/-1; }
  .field label{ font-family:'Inter',sans-serif; font-size:12px; letter-spacing:0.04em; color:rgba(251,250,246,0.7); }
  .field input, .field select, .field textarea{ background:rgba(251,250,246,0.06); border:1px solid rgba(251,250,246,0.25); border-radius:2px; padding:12px 14px; color:var(--white); font-family:'Source Serif 4',serif; font-size:15px; }
  body.lang-zh .field input, body.lang-zh .field textarea{ font-family:'Noto Serif SC',serif; }
  .field input::placeholder, .field textarea::placeholder{ color:rgba(251,250,246,0.35); }
  .field textarea{ min-height:110px; resize:vertical; }
  .form-submit{ margin-top:30px; }
  .form-foot{ margin-top:20px; font-family:'Inter',sans-serif; font-size:12.5px; color:rgba(251,250,246,0.55); line-height:1.7; }

  footer{ background:var(--jade-deeper); color:rgba(251,250,246,0.55); padding:44px 0; font-family:'Inter',sans-serif; font-size:12.5px; }
  .foot-row{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px; }