:root{
    --paper:#f4f6fb; --card:#ffffff;
    --ink:#0d1b2e; --ink-2:#1b2a44;
    --gold:#d4af37; --gold-lt:#f1d27a;
    --muted:#6b7280; --line:#e5e8f0;
    --radius:16px;
  }
  *{margin:0;padding:0;box-sizing:border-box;}
  body{font-family:"Segoe UI","Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);line-height:1.65;-webkit-font-smoothing:antialiased;}
  img{max-width:100%;height:auto;display:block;}
  .wrap{max-width:1120px;margin:0 auto;padding:0 20px;}

  /* ===== HERO ===== */
  .hero{background:radial-gradient(1000px 460px at 88% -8%, rgba(212,175,55,.22), transparent 60%),linear-gradient(150deg,#0d1b2e 0%,#1b2a44 100%);padding:70px 0 60px;position:relative;overflow:hidden;border-bottom:1px solid var(--line);}
  .hero .grid{display:flex;align-items:center;gap:52px;position:relative;z-index:1;}
  .hero .txt{flex:1.12;}
  .hero .imgbox{flex:1;position:relative;}
  .hero .imgbox::before{content:"";position:absolute;inset:-16px;border:2px solid rgba(176,141,46,.35);border-radius:34px;z-index:0;}
  .hero .imgbox::after{content:"";position:absolute;inset:-16px;border:2px solid rgba(176,141,46,.35);border-radius:34px;transform:translate(10px,10px);z-index:-1;opacity:.5;}
  .hero .imgbox img{position:relative;z-index:1;border-radius:24px;border:1px solid var(--line);box-shadow:0 30px 60px rgba(35,40,48,.16);background:#fff;}
  .kicker{display:inline-block;font-size:12px;letter-spacing:2.5px;text-transform:uppercase;color:var(--gold-lt);border:1px solid rgba(241,210,122,.55);border-radius:999px;padding:6px 16px;margin-bottom:20px;background:rgba(212,175,55,.14);font-weight:700;}
  .hero h1{font-size:46px;line-height:1.12;font-weight:800;letter-spacing:-.6px;margin-bottom:16px;color:#ffffff;}
  .hero h1 em{font-style:normal;color:var(--gold-lt);}
  .hero .sub{font-size:16.5px;color:#b9c4d9;max-width:540px;margin-bottom:28px;}
  .cta-row{display:flex;gap:14px;flex-wrap:wrap;}
  .btn{display:inline-block;padding:13px 28px;border-radius:999px;font-weight:700;font-size:15px;text-decoration:none;transition:.25s;}
  .btn-gold{background:linear-gradient(135deg,#d9b64a,#b08d2e);color:#fff;box-shadow:0 10px 24px rgba(176,141,46,.35);}
  .btn-gold:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(176,141,46,.45);}
  .btn-ghost{border:1.5px solid rgba(255,255,255,.6);color:#ffffff;}
  .btn-ghost:hover{background:rgba(255,255,255,.12);}

  /* ===== USP ===== */
  .usp{background:var(--card);border-bottom:1px solid var(--line);box-shadow:0 6px 24px rgba(35,40,48,.05);position:relative;z-index:2;}
  .usp .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;}
  .usp .item{padding:22px 24px;display:flex;gap:14px;align-items:center;border-right:1px solid var(--line);}
  .usp .item:last-child{border-right:none;}
  .usp .ico{width:46px;height:46px;flex:none;border-radius:12px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#f6f1e3,#fbf8f0);border:1px solid var(--line);font-size:22px;}
  .usp .b b{display:block;font-size:15px;color:var(--ink);}
  .usp .b span{font-size:12.5px;color:var(--muted);}

  /* ===== SECTIONS ===== */
  section{padding:66px 0;}
  .alt{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .sec-head{text-align:center;max-width:760px;margin:0 auto 42px;}
  .sec-head .tag{display:inline-block;font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--gold);font-weight:700;margin-bottom:10px;position:relative;}
  .sec-head .tag::after{content:"";display:block;width:44px;height:2px;background:var(--gold);margin:8px auto 0;border-radius:2px;}
  .sec-head h2{font-size:31px;font-weight:800;color:var(--ink);letter-spacing:-.3px;}
  .sec-head p{color:var(--muted);margin-top:10px;font-size:15.5px;}

  /* ===== TWO-COL (overview / meaning) ===== */
  .two{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;}
  .two .pics{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
  .two .pics img{aspect-ratio:4/3;object-fit:cover;border-radius:14px;box-shadow:0 14px 34px rgba(35,40,48,.10);}
  .two .pics img:first-child{grid-column:1 / -1;aspect-ratio:16/9;}
  .two h3{font-size:24px;color:var(--ink);margin-bottom:14px;font-weight:800;}
  .two p{color:var(--muted);margin-bottom:14px;font-size:15.5px;}
  .ov-list{list-style:none;margin-top:18px;}
  .ov-list li{display:flex;gap:10px;align-items:flex-start;padding:9px 0;border-bottom:1px dashed var(--line);font-size:14.5px;color:var(--ink);}
  .ov-list li:last-child{border-bottom:none;}
  .ov-list .chk{color:var(--gold);font-weight:800;flex:none;}

  /* ===== STEPS (flex, centered rows) ===== */
  .steps{display:flex;flex-wrap:wrap;justify-content:center;gap:18px;}
  .step{width:calc(20% - 15px);background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s;box-shadow:0 8px 22px rgba(35,40,48,.05);}
  .step:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(35,40,48,.12);border-color:rgba(176,141,46,.5);}
  .step img{width:100%;aspect-ratio:1/1;object-fit:cover;display:block;}
  .step .body{padding:16px 16px 20px;}
  .step .no{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,#d9b64a,#b08d2e);color:#fff;font-weight:800;font-size:13.5px;margin-bottom:9px;}
  .step h4{font-size:15px;color:var(--ink);margin-bottom:5px;font-weight:800;}
  .step p{font-size:12.8px;color:var(--muted);}

  /* ===== CHAIN ===== */
  .chain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
  .chain{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px 16px;text-align:center;}
  .chain .n{font-size:12px;color:var(--gold);font-weight:800;letter-spacing:1px;}
  .chain b{display:block;font-size:14.5px;color:var(--ink);margin-top:5px;}
  .chain span{font-size:12px;color:var(--muted);}

  /* ===== GALLERIES: unified ratios ===== */
  .gal{display:grid;gap:14px;}
  .gal-4{grid-template-columns:repeat(4,1fr);}
  .gal-3{grid-template-columns:repeat(3,1fr);}
  .gal-2{grid-template-columns:repeat(2,1fr);}
  .sq .gal-item{aspect-ratio:1/1;}
  .r43 .gal-item{aspect-ratio:4/3;}
  .r169 .gal-item{aspect-ratio:16/9;}
  .gal-item{position:relative;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:0 6px 18px rgba(35,40,48,.05);}
  .gal-item img{width:100%;height:100%;object-fit:cover;transition:.35s;}
  .gal-item:hover img{transform:scale(1.07);}
  .gal-item:hover{border-color:rgba(176,141,46,.5);}
  .gal-item .cap{position:absolute;left:0;right:0;bottom:0;padding:20px 10px 9px;font-size:12px;color:#fff;text-align:center;background:linear-gradient(180deg,transparent,rgba(35,40,48,.88));font-weight:600;letter-spacing:.4px;}

  /* ===== TYPES ===== */
  .types{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
  .type-item{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 8px 22px rgba(35,40,48,.05);transition:.25s;}
  .type-item:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(35,40,48,.12);border-color:rgba(176,141,46,.5);}
  .type-item img{width:100%;aspect-ratio:1/1;object-fit:cover;display:block;}
  .type-item .body{padding:16px 18px 20px;}
  .type-item h4{font-size:16px;color:var(--ink);margin-bottom:5px;font-weight:800;}
  .type-item p{font-size:13px;color:var(--muted);}

  /* ===== SPEC ===== */
  .spec-table{width:100%;border-collapse:collapse;background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:0 10px 30px rgba(35,40,48,.06);}
  .spec-table th,.spec-table td{padding:15px 20px;text-align:left;font-size:14.5px;border-bottom:1px solid var(--line);}
  .spec-table th{background:var(--ink);color:#fff;font-weight:700;width:34%;}
  .spec-table tr:last-child td{border-bottom:none;}
  .spec-table tr:nth-child(even) td{background:#f6f9ff;}

  /* ===== FAQ ===== */
  .faq{max-width:860px;margin:0 auto;}
  details{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:12px;overflow:hidden;box-shadow:0 4px 14px rgba(35,40,48,.04);}
  summary{cursor:pointer;padding:18px 22px;font-weight:700;font-size:15.5px;color:var(--ink);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:14px;}
  summary::-webkit-details-marker{display:none;}
  summary::after{content:"+";font-size:22px;color:var(--gold);font-weight:400;transition:.25s;flex:none;}
  details[open] summary::after{transform:rotate(45deg);}
  details .a{padding:0 22px 20px;color:var(--muted);font-size:14.5px;}
  details .a b{color:var(--ink);}

  /* ===== CTA ===== */
  .cta{background:radial-gradient(900px 400px at 15% 0%, rgba(201,162,57,.18), transparent 55%),linear-gradient(150deg,#0d1b2e,#1b2a44);color:#fff;text-align:center;padding:74px 20px;}
  .cta h2{font-size:34px;font-weight:800;margin-bottom:12px;}
  .cta p{color:#b9c0cc;max-width:640px;margin:0 auto 26px;font-size:16px;}
  .cta .small{font-size:12.5px;color:#8d94a3;margin-top:16px;}
  footer{background:#0a1322;color:#8d94a3;text-align:center;padding:26px 16px;font-size:12.5px;}

  @media (max-width:960px){
    .hero h1{font-size:34px;}
    .usp .grid{grid-template-columns:repeat(2,1fr);}
    .usp .item:nth-child(2){border-right:none;}
    .usp .item:nth-child(-n+2){border-bottom:1px solid var(--line);}
    .two{grid-template-columns:1fr;}
    .step{width:calc(33.333% - 13px);}
    .chain-grid{grid-template-columns:repeat(2,1fr);}
    .gal-4{grid-template-columns:repeat(2,1fr);}
    .gal-3,.gal-2{grid-template-columns:repeat(2,1fr);}
    .types{grid-template-columns:repeat(2,1fr);}
  }
  @media (max-width:560px){
    section{padding:48px 0;}
    .hero{padding:46px 0 42px;}
    .hero .grid{flex-direction:column;gap:30px;}
    .hero h1{font-size:28px;}
    .usp .grid{grid-template-columns:1fr;}
    .usp .item{border-right:none;border-bottom:1px solid var(--line);}
    .usp .item:last-child{border-bottom:none;}
    .step{width:100%;}
    .chain-grid{grid-template-columns:1fr;}
    .gal-4,.gal-3,.gal-2{grid-template-columns:repeat(2,1fr);}
    .types{grid-template-columns:1fr;}
    .sec-head h2{font-size:25px;}
  }