/* ============================================================
   OKDMOUNT 官网 · 设计系统 v1.0
   Swiss Modernism 2.0 — 浅色商务 ToB
   配色: #FFFFFF 纸 / #171717 墨 / #A16207 金 / #f6efdf 金软
   字体: Lexend 800 (标题) + Source Sans 3 (正文)
   ============================================================ */
:root{
  --paper:#ffffff;
  --ink:#171717;
  --gold:#A16207;
  --gold-strong:#855012;
  --gold-soft:#f6efdf;
  --line:#e5e5e5;
  --muted:#555555;
  --bg-soft:#fafafa;
  --ok:#15803d;
  --max:1200px;
  --radius:8px;
  --shadow:0 1px 3px rgba(0,0,0,.06),0 8px 24px rgba(0,0,0,.05);
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Source Sans 3","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--paper);
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{
  font-family:"Lexend","Source Sans 3","Noto Sans SC",sans-serif;
  font-weight:800;line-height:1.25;margin:0 0 .5em;letter-spacing:.2px;
}
h1{font-size:clamp(28px,4vw,46px);}
h2{font-size:clamp(22px,3vw,32px);}
h3{font-size:20px;}
p{margin:0 0 1em;}
a{color:inherit;text-decoration:none;}
img,svg{max-width:100%;height:auto;display:block;}
ul{margin:0 0 1em;padding-left:1.2em;}
li{margin:.3em 0;}
.container{max-width:var(--max);margin:0 auto;padding:0 24px;}
.small{font-size:.85em;color:var(--muted);}
.muted{color:var(--muted);}
.gold{color:var(--gold);}
.center{text-align:center;}
section{padding:64px 0;}
.sec-soft{background:var(--bg-soft);}
.sec-gold{background:var(--gold-soft);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;border-radius:var(--radius);
  font-family:"Lexend",sans-serif;font-weight:700;font-size:15px;
  cursor:pointer;border:1px solid transparent;
  transition:transform .15s ease,background .15s ease,color .15s ease;
  white-space:nowrap;
}
.btn-gold{background:var(--gold);color:#fff;}
.btn-gold:hover{background:var(--gold-strong);transform:translateY(-1px);}
.btn-outline{border-color:var(--ink);color:var(--ink);background:transparent;}
.btn-outline:hover{background:var(--ink);color:#fff;}
.btn-lg{padding:14px 28px;font-size:16px;}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:24px;height:64px;}
.brand{display:flex;align-items:center;gap:10px;font-family:"Lexend";font-weight:800;font-size:19px;letter-spacing:.5px;}
.brand .mark{width:32px;height:32px;border-radius:6px;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:15px;font-weight:800;}
.nav-links{display:flex;gap:22px;margin-left:auto;font-size:15px;font-weight:600;}
.nav-links a{color:var(--ink);position:relative;padding:4px 0;}
.nav-links a:hover{color:var(--gold);}
.nav-actions{display:flex;align-items:center;gap:12px;margin-left:8px;}
.lang-switch{font-size:13px;font-weight:700;border:1px solid var(--line);border-radius:20px;padding:5px 12px;color:var(--muted);}
.lang-switch:hover{border-color:var(--gold);color:var(--gold);}
.menu-toggle{display:none;background:none;border:1px solid var(--line);border-radius:6px;padding:8px 10px;cursor:pointer;font-size:18px;}

/* ---------- Hero ---------- */
.hero{padding:72px 0 56px;}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;}
.hero .eyebrow{display:inline-block;font-family:"Lexend";font-weight:700;font-size:13px;letter-spacing:1.5px;text-transform:uppercase;color:var(--gold);margin-bottom:14px;}
.hero p.lead{font-size:18px;color:var(--muted);max-width:34em;}
.hero-cta{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap;}
.hero-visual{
  aspect-ratio:4/3;border-radius:14px;background:
    radial-gradient(120% 120% at 80% 10%,var(--gold-soft) 0%,transparent 55%),
    linear-gradient(135deg,#1b1b1b 0%,#2c2c2c 100%);
  display:grid;place-items:center;color:#fff;position:relative;overflow:hidden;
  box-shadow:var(--shadow);
}
.hero-visual .ring{width:62%;aspect-ratio:1;border:2px solid rgba(255,255,255,.25);border-radius:50%;position:absolute;}
.hero-visual .ring.r2{width:42%;border-color:rgba(161,98,7,.8);}
.hero-visual .badge{position:relative;font-family:"Lexend";font-weight:800;font-size:22px;text-align:center;line-height:1.3;}
.hero-visual .badge small{display:block;font-weight:600;font-size:13px;color:#d9c9a8;letter-spacing:1px;}

/* ---------- 信任条 ---------- */
.trustbar{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;}
.trust-item{display:flex;align-items:center;gap:10px;font-weight:700;font-size:14px;}
.trust-item .n{font-family:"Lexend";font-size:22px;color:var(--gold);line-height:1;}

/* ---------- 区块标题 ---------- */
.sec-head{max-width:640px;margin:0 auto 40px;text-align:center;}
.sec-head .eyebrow{font-family:"Lexend";font-weight:700;font-size:13px;letter-spacing:1.5px;text-transform:uppercase;color:var(--gold);}
.sec-head p{color:var(--muted);font-size:17px;}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:22px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}
.card{
  border:1px solid var(--line);border-radius:12px;background:#fff;
  padding:24px;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d9cfb8;}
.card h3{font-size:18px;margin-bottom:8px;}
.card .ic{width:44px;height:44px;border-radius:10px;background:var(--gold-soft);color:var(--gold);display:grid;place-items:center;font-family:"Lexend";font-weight:800;font-size:18px;margin-bottom:14px;}
.card p{color:var(--muted);font-size:15px;margin:0;}

/* 产品卡 */
.prod-card{display:flex;flex-direction:column;}
.prod-thumb{aspect-ratio:1;border-radius:10px;background:var(--bg-soft);border:1px solid var(--line);display:grid;place-items:center;color:var(--muted);font-size:13px;margin-bottom:16px;overflow:hidden;}
.prod-card h3{font-size:16px;}
.tag-row{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 12px;}
.tag{font-size:11px;font-weight:700;color:var(--gold-strong);background:var(--gold-soft);border-radius:20px;padding:3px 10px;}
.prod-card .price{font-family:"Lexend";font-weight:800;font-size:18px;color:var(--ink);margin-top:auto;}
.prod-card .price .rfq{font-size:13px;color:var(--gold);font-weight:700;}

/* ---------- 步骤流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:step;}
.step{position:relative;padding:22px;border:1px solid var(--line);border-radius:12px;background:#fff;}
.step .num{font-family:"Lexend";font-weight:800;font-size:14px;color:#fff;background:var(--gold);width:30px;height:30px;border-radius:50%;display:grid;place-items:center;margin-bottom:12px;}

/* ---------- 产品详情 ---------- */
.pdp-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:48px;align-items:start;}
.pdp-gallery .main{aspect-ratio:4/3;border-radius:12px;border:1px solid var(--line);background:var(--bg-soft);display:grid;place-items:center;color:var(--muted);font-size:13px;}
.thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px;}
.thumbs div{aspect-ratio:1;border:1px solid var(--line);border-radius:8px;background:var(--bg-soft);}
.spec-table{width:100%;border-collapse:collapse;margin:8px 0 18px;font-size:15px;}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:10px 14px;text-align:left;vertical-align:top;}
.spec-table th{background:var(--bg-soft);width:38%;font-family:"Lexend";font-weight:700;color:var(--ink);}
.pdp-cta{display:flex;gap:12px;margin:18px 0;flex-wrap:wrap;}

/* FAQ */
.faq-item{border:1px solid var(--line);border-radius:10px;padding:16px 20px;margin-bottom:12px;background:#fff;}
.faq-item h4{margin:0 0 6px;font-size:16px;}
.faq-item p{margin:0;color:var(--muted);font-size:15px;}

/* Breadcrumb */
.crumb{font-size:13px;color:var(--muted);margin-bottom:18px;}
.crumb a:hover{color:var(--gold);}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:#e9e9e9;padding:56px 0 28px;}
.site-footer h4{color:#fff;font-size:15px;letter-spacing:.5px;margin-bottom:14px;}
.site-footer a{color:#cfcfcf;font-size:14px;}
.site-footer a:hover{color:var(--gold);}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;}
.foot-grid p,.foot-grid li{color:#bdbdbd;font-size:14px;}
.foot-bottom{border-top:1px solid #2c2c2c;margin-top:36px;padding-top:18px;font-size:13px;color:#8a8a8a;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  .hero-grid,.pdp-grid{grid-template-columns:1fr;gap:32px;}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(2,1fr);}
  .foot-grid{grid-template-columns:1fr 1fr;}
}
@media(max-width:640px){
  section{padding:48px 0;}
  .nav-links{
    position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;gap:0;padding:8px 24px;display:none;
  }
  .nav-links.open{display:flex;}
  .nav-links a{padding:12px 0;border-bottom:1px solid var(--line);}
  .menu-toggle{display:block;margin-left:auto;}
  .nav-actions .btn{display:none;}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr;}
  .foot-grid{grid-template-columns:1fr;}
}
/* 可访问性 */
:focus-visible{outline:2px solid var(--gold);outline-offset:2px;}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto;}*{transition:none!important;}}