/* ============================================================
   Yuan Global Trade — B2B Transformer Parts Export Site
   纯静态、零依赖。品牌色：深蓝 + 工业橙。
   品牌名 "Yuan Global Trade" / 域名 yuanglobaltrade.com（已定稿 2026-09-11）。
   ============================================================ */
:root{
  --navy:#0f2b46;
  --navy-2:#163a5c;
  --orange:#e8712a;
  --orange-d:#c85c1d;
  --ink:#1c2733;
  --muted:#5b6b7a;
  --line:#dde5ec;
  --bg:#ffffff;
  --bg-soft:#f4f7fa;
  --ok:#1e7f4f;
  --radius:10px;
  --maxw:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px;
}
img{max-width:100%;display:block}
a{color:var(--navy);text-decoration:none}
a:hover{color:var(--orange)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ---------- header ---------- */
.site-header{background:var(--navy);color:#fff}
.site-header .container{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:1.15rem;letter-spacing:.5px}
.logo img{height:34px;width:auto}
.logo span em{color:var(--orange);font-style:normal}
.main-nav ul{display:flex;gap:4px;list-style:none;flex-wrap:wrap}
.main-nav a{color:#dce6f0;padding:8px 12px;border-radius:6px;font-size:.95rem}
.main-nav a:hover{background:var(--navy-2);color:#fff}
.main-nav a.nav-cta{background:var(--orange);color:#fff;font-weight:600}
.main-nav a.nav-cta:hover{background:var(--orange-d)}
.lang-switch{font-size:.85rem;color:#9fb3c6}
.lang-li{display:flex;align-items:center}
.lang-select{background:var(--navy-2);color:#dce6f0;border:1px solid #2f5074;border-radius:6px;padding:6px 8px;font-size:.85rem;cursor:pointer}
.lang-select:focus{outline:2px solid var(--orange)}
/* 阿拉伯语 RTL 微调 */
html[dir="rtl"] body{direction:rtl}
html[dir="rtl"] .feature .ic{margin-left:0;margin-right:0}
html[dir="rtl"] .cta-band{flex-direction:row-reverse}
@media(max-width:600px){html[dir="rtl"] .cta-band{flex-direction:column}}
/* 问询结果面板 */
.inquiry-result{margin-top:18px;border-radius:8px;padding:16px 18px;font-size:.95rem;display:none}
.inquiry-result--ok{background:#eef8f1;border:1px solid #bfe3cd;color:#1e5a39}
.inquiry-result--warn{background:#fff8e6;border:1px solid #f0d98c;color:#8a6300}
.inquiry-result pre{white-space:pre-wrap}

/* ---------- hero ---------- */
.hero{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 70%);color:#fff;padding:64px 0 72px}
.hero h1{font-size:2.1rem;line-height:1.3;max-width:760px}
.hero p{margin-top:16px;max-width:680px;color:#c9d7e4;font-size:1.06rem}
.hero .btn-row{margin-top:28px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 26px;border-radius:8px;font-weight:600;font-size:1rem}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:var(--orange-d);color:#fff}
.btn-ghost{border:1.5px solid #6d87a0;color:#e6eef5}
.btn-ghost:hover{border-color:#fff;color:#fff}

/* ---------- sections ---------- */
.section{padding:56px 0}
.section.alt{background:var(--bg-soft)}
.section h2{font-size:1.6rem;color:var(--navy);margin-bottom:8px}
.section .sub{color:var(--muted);margin-bottom:32px;max-width:720px}
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.grid-3,.grid-4{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:box-shadow .2s}
.card:hover{box-shadow:0 6px 18px rgba(15,43,70,.12)}
.card img{width:100%;aspect-ratio:4/3;object-fit:cover;background:#e8edf2}
.card .card-body{padding:16px}
.card h3{font-size:1.05rem;color:var(--navy)}
.card p{font-size:.9rem;color:var(--muted);margin-top:6px}
.card .more{display:inline-block;margin-top:10px;font-size:.9rem;font-weight:600;color:var(--orange)}

.feature{display:flex;gap:14px;align-items:flex-start}
.feature .ic{flex:0 0 44px;height:44px;border-radius:10px;background:var(--bg-soft);display:flex;align-items:center;justify-content:center;font-size:1.3rem}
.feature h3{font-size:1rem;color:var(--navy)}
.feature p{font-size:.92rem;color:var(--muted)}

/* ---------- product page ---------- */
.breadcrumb{font-size:.85rem;color:var(--muted);padding:18px 0 0}
.breadcrumb a{color:var(--muted)}
.product-layout{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;padding:28px 0}
@media(max-width:800px){.product-layout{grid-template-columns:1fr}}
.product-layout h1{font-size:1.7rem;color:var(--navy);line-height:1.3}
.product-layout .lead{margin-top:12px;color:var(--muted)}
.key-facts{margin-top:20px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.key-facts div{display:flex;justify-content:space-between;padding:10px 14px;font-size:.93rem;border-bottom:1px solid var(--line)}
.key-facts div:last-child{border-bottom:none}
.key-facts dt{color:var(--muted)}
.key-facts dd{font-weight:600;text-align:right}
table.spec{width:100%;border-collapse:collapse;font-size:.93rem;margin-top:12px}
table.spec th{background:var(--navy);color:#fff;text-align:left;padding:10px 12px;font-weight:600}
table.spec td{border:1px solid var(--line);padding:9px 12px}
table.spec tr:nth-child(even) td{background:var(--bg-soft)}
/* TBD 占位：上线前须替换为工厂确认值 */
.tbd{color:var(--orange-d);font-weight:600}
.footnote{font-size:.82rem;color:var(--muted);margin-top:10px}

.cta-band{background:var(--navy);color:#fff;border-radius:var(--radius);padding:28px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;margin:40px 0}
.cta-band h2{color:#fff;margin:0;font-size:1.3rem}
.cta-band p{color:#c9d7e4;font-size:.95rem}

/* ---------- forms ---------- */
form.rfq{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:20px}
@media(max-width:700px){form.rfq{grid-template-columns:1fr}}
form.rfq .full{grid-column:1/-1}
.rfq label{font-size:.88rem;font-weight:600;color:var(--navy);display:block;margin-bottom:5px}
.rfq input,.rfq select,.rfq textarea{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;
  font:inherit;font-size:.95rem;background:#fff;
}
.rfq input:focus,.rfq select:focus,.rfq textarea:focus{outline:2px solid var(--orange);border-color:var(--orange)}
.rfq small{color:var(--muted);font-weight:400}

/* ---------- footer ---------- */
.site-footer{background:var(--navy);color:#9fb3c6;margin-top:64px;padding:40px 0 24px;font-size:.9rem}
.site-footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px}
@media(max-width:700px){.site-footer .cols{grid-template-columns:1fr}}
.site-footer h4{color:#fff;margin-bottom:10px;font-size:.95rem}
.site-footer a{color:#c9d7e4;display:block;padding:3px 0}
.site-footer .legal{border-top:1px solid #274b6d;margin-top:28px;padding-top:16px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:.82rem}

/* ---------- misc ---------- */
.badge{display:inline-block;background:#fdf1e8;color:var(--orange-d);font-size:.78rem;font-weight:700;padding:3px 10px;border-radius:99px;letter-spacing:.4px}
.faq details{border:1px solid var(--line);border-radius:8px;padding:14px 16px;margin-bottom:10px;background:#fff}
.faq summary{font-weight:600;color:var(--navy);cursor:pointer}
.faq p{margin-top:8px;color:var(--muted);font-size:.95rem}
.center{text-align:center}
.note-warn{background:#fff8e6;border:1px solid #f0d98c;border-radius:8px;padding:12px 16px;font-size:.9rem;margin-top:16px}

/* ---------- product photo gallery (real factory photos, added 2026-09-16) ---------- */
.img-thumbs{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}
.img-thumbs img{width:100%;height:auto;border:1px solid var(--line);border-radius:var(--radius)}
.product-layout > div > img{border:1px solid var(--line);border-radius:var(--radius)}
.model-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px;list-style:none;padding:0}
.model-chips li{background:var(--bg-soft);border:1px solid var(--line);border-radius:999px;padding:4px 12px;font-size:.9rem;font-family:Consolas,monospace;color:var(--navy)}

/* ---------- clickable feature cards (cn landing, fixed 2026-09-16) ---------- */
a.feature{display:flex;gap:14px;align-items:flex-start;padding:16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);text-decoration:none;transition:border-color .18s,background .18s,transform .18s}
a.feature:hover{border-color:var(--orange);background:var(--bg-soft);transform:translateY(-2px)}
a.feature h3{color:var(--navy)}
a.feature:hover h3{color:var(--orange-d)}
a.feature .go{display:inline-block;margin-top:8px;font-size:.83rem;color:var(--orange-d);font-weight:500}