/* ============================================================
   Shanghai Diban Industrial — Foreign Trade Website
   Design tokens & components
   ============================================================ */

:root{
  --ink:#08131F;
  --navy:#0E2237;
  --navy-2:#16324B;
  --steel:#1E5FA8;
  --steel-2:#4A86C8;
  --mist:#9FB2C4;
  --paper:#F6F8FA;
  --white:#FFFFFF;
  --line:rgba(14,34,55,.12);
  --line-dark:rgba(255,255,255,.14);
  --accent:#E2603B;
  --ok:#2E8B6E;

  --r-sm:6px;
  --r-md:10px;
  --r-lg:18px;

  --shadow-sm:0 1px 2px rgba(8,19,31,.06), 0 4px 12px rgba(8,19,31,.05);
  --shadow-md:0 10px 30px rgba(8,19,31,.10);
  --shadow-lg:0 24px 60px rgba(8,19,31,.16);

  --max:1200px;
  --pad:clamp(20px,4vw,48px);

  --font:"Inter","Helvetica Neue",-apple-system,BlinkMacSystemFont,"Segoe UI",
         "PingFang SC","Microsoft YaHei",Roboto,Arial,sans-serif;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--white);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.15;letter-spacing:-.02em;font-weight:700}
p{margin:0}
ul{margin:0;padding:0;list-style:none}

.wrap{max-width:var(--max);margin-inline:auto;padding-inline:var(--pad)}
.split>*,.grid>*{min-width:0}
.table-wrap{max-width:100%}
.section{padding-block:clamp(56px,7vw,104px)}
.section--tight{padding-block:clamp(40px,5vw,64px)}
.bg-paper{background:var(--paper)}
.bg-navy{background:var(--navy);color:var(--white)}

/* ---------- eyebrow / headings ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--steel);margin-bottom:18px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--accent)}
.bg-navy .eyebrow{color:var(--mist)}
.hero .eyebrow,.page-hero .eyebrow{color:#9FC4EA;font-weight:700}
.hero .eyebrow::before,.page-hero .eyebrow::before{background:var(--accent)}
.h2{font-size:clamp(28px,3.6vw,44px);max-width:22ch;text-wrap:balance}
.lede{font-size:clamp(16px,1.5vw,19px);color:#4A5C6E;max-width:62ch;margin-top:16px}
.bg-navy .lede{color:var(--mist)}

/* ---------- header ---------- */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;letter-spacing:-.02em}
.brand svg{width:34px;height:34px;flex:none}
.brand-name{font-size:15px;line-height:1.15;white-space:nowrap}
.brand-name small{display:block;font-size:10.5px;font-weight:500;letter-spacing:.16em;text-transform:uppercase;color:#6B7C8D}

.nav{display:flex;align-items:center;gap:clamp(12px,1.6vw,28px);flex-wrap:nowrap}
.nav a{font-size:14px;font-weight:500;color:#31465A;position:relative;padding-block:6px;white-space:nowrap}
.nav a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--steel);transform:scaleX(0);transform-origin:left;
  transition:transform .22s ease;
}
.nav a:hover{color:var(--ink)}
.nav a:hover::after,.nav a[aria-current="page"]::after{transform:scaleX(1)}
.nav a[aria-current="page"]{color:var(--ink)}

.header-actions{display:flex;align-items:center;gap:10px}

.lang{
  display:inline-flex;border:1px solid var(--line);border-radius:99px;overflow:hidden;
  font-size:12px;font-weight:600;background:var(--white);
}
.lang button{
  border:0;background:transparent;padding:7px 13px;cursor:pointer;
  color:#6B7C8D;font:inherit;transition:.18s;white-space:nowrap;flex:none;
}
.lang button[aria-pressed="true"]{background:var(--navy);color:var(--white)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border-radius:var(--r-sm);font-size:14px;font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:.18s;white-space:nowrap;
}
.btn-primary{background:var(--steel);color:var(--white)}
.btn-primary:hover{background:#17518F;transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-ghost{border-color:var(--line-dark);color:var(--white)}
.btn-ghost:hover{background:rgba(255,255,255,.08)}
.btn-line{border-color:var(--line);color:var(--ink);background:var(--white)}
.btn-line:hover{border-color:var(--steel);color:var(--steel)}
.btn-sm{padding:9px 15px;font-size:13px}

.burger{display:none;border:1px solid var(--line);background:var(--white);border-radius:var(--r-sm);
  width:40px;height:38px;cursor:pointer;align-items:center;justify-content:center}
.burger span{display:block;width:16px;height:1.5px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:16px;height:1.5px;background:var(--ink)}
.burger span::before{top:-5px}.burger span::after{top:5px}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;background:var(--navy);color:var(--white);
  padding-block:clamp(64px,9vw,120px);
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(1100px 520px at 78% 8%, rgba(30,95,168,.55), transparent 65%),
    radial-gradient(700px 420px at 8% 100%, rgba(226,96,59,.18), transparent 70%),
    linear-gradient(180deg,#0B1C2E,#0E2237 60%,#0A1826);
}
.hero::after{
  content:"";position:absolute;inset:0;opacity:.16;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.5) 1px,transparent 1px);
  background-size:72px 72px;
  mask-image:radial-gradient(1200px 600px at 70% 20%,#000 10%,transparent 75%);
  -webkit-mask-image:radial-gradient(1200px 600px at 70% 20%,#000 10%,transparent 75%);
}
.hero .wrap{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(32px,5vw,72px);align-items:center}
.hero h1{font-size:clamp(34px,5vw,62px);letter-spacing:-.03em;max-width:18ch}
.hero h1 em{font-style:normal;color:#7FB2E8}
.hero p{margin-top:22px;font-size:clamp(16px,1.5vw,18.5px);color:#C5D3E0;max-width:54ch}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.hero-meta{margin-top:38px;display:flex;flex-wrap:wrap;gap:26px;font-size:12.5px;color:#93A8BB;letter-spacing:.02em}
.hero-meta b{color:var(--white);font-weight:600}

/* coil visual */
.hero-art{position:relative;display:flex;align-items:center;justify-content:center;min-height:340px}
.coil{width:min(420px,88%);aspect-ratio:1;position:relative;filter:drop-shadow(0 30px 60px rgba(0,0,0,.45))}
.coil svg{width:100%;height:100%}
.spin{transform-origin:50% 50%;animation:spin 42s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spin{animation:none}}

/* ---------- trust strip ---------- */
.strip{border-bottom:1px solid var(--line);background:var(--white)}
.strip-inner{display:flex;flex-wrap:wrap;align-items:center;gap:clamp(18px,3vw,40px);padding-block:20px}
.strip-label{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:#8B9AA9;font-weight:600}
.strip-item{font-size:14px;font-weight:600;color:#33485C;letter-spacing:.01em;opacity:.9}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.stat{background:var(--white);padding:clamp(20px,3vw,30px)}
.stat b{display:block;font-size:clamp(24px,2.8vw,33px);letter-spacing:-.03em;color:var(--navy);white-space:nowrap}
.stat span{display:block;margin-top:6px;font-size:12.5px;color:#6B7C8D;letter-spacing:.02em}

/* ---------- cards / grid ---------- */
.grid{display:grid;gap:clamp(14px,2vw,22px)}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r-md);
  padding:clamp(20px,2.4vw,28px);transition:.2s;
}
.card:hover{border-color:rgba(30,95,168,.4);box-shadow:var(--shadow-md);transform:translateY(-2px)}
.card h3{font-size:16.5px;margin-bottom:8px}
.card p{font-size:14px;color:#5A6C7D}
.card .ico{width:38px;height:38px;margin-bottom:16px;color:var(--steel)}
.card .tag{display:inline-block;font-size:11px;font-weight:600;letter-spacing:.06em;
  text-transform:uppercase;color:var(--steel);background:rgba(30,95,168,.08);
  padding:4px 9px;border-radius:99px;margin-top:14px}

/* product tile */
.tile{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--r-md);background:var(--white);padding:24px;transition:.22s}
.tile::after{content:"";position:absolute;right:-50px;bottom:-50px;width:110px;height:110px;border-radius:50%;
  background:radial-gradient(circle at 30% 30%,rgba(30,95,168,.07),transparent 72%);pointer-events:none}
.tile:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:rgba(30,95,168,.35)}
.tile h3{font-size:15.5px;margin-bottom:6px}
.tile p{font-size:13px;color:#6B7C8D}
.tile .hs{position:absolute;top:14px;right:16px;font-family:var(--mono);font-size:10.5px;color:#9AA9B7}

/* ---------- split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,72px);align-items:center}
.checklist{display:grid;gap:14px;margin-top:26px}
.checklist li{display:flex;gap:12px;font-size:14.5px;color:#3F5567;align-items:flex-start}
.checklist svg{flex:none;width:18px;height:18px;color:var(--ok);margin-top:3px}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-md);background:var(--white)}
table{width:100%;border-collapse:collapse;font-size:13.5px;min-width:560px}
caption{caption-side:top;text-align:left;padding:16px 18px 12px;font-size:12px;color:#7A8A99;letter-spacing:.04em;text-transform:uppercase;font-weight:600}
th,td{padding:11px 18px;text-align:left;border-bottom:1px solid var(--line)}
th{background:var(--paper);font-weight:600;font-size:12px;letter-spacing:.04em;color:#5A6C7D;white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:rgba(30,95,168,.035)}
td.num{font-family:var(--mono);font-size:12.5px;white-space:nowrap}

/* ---------- partner grid ---------- */
.partner-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden}
.partner-grid div{background:var(--white);padding:16px 18px;font-size:12.8px;color:#40566A;line-height:1.45}

/* ---------- CTA ---------- */
.cta{position:relative;overflow:hidden;background:linear-gradient(120deg,#0E2237,#1E5FA8);color:var(--white);border-radius:var(--r-lg);padding:clamp(32px,5vw,60px)}
.cta::after{content:"";position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.14),transparent 68%)}
.cta h2{font-size:clamp(24px,3vw,36px);max-width:26ch}
.cta p{margin-top:14px;color:#C5D3E0;max-width:52ch}
.cta .row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}

/* ---------- contact channels ---------- */
.channels{display:flex;flex-wrap:wrap;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;margin-top:10px}
.channel{flex:1 1 210px;min-width:0;background:var(--white);padding:18px 20px;display:flex;gap:13px;align-items:flex-start;transition:.18s}
.channel:hover{background:rgba(30,95,168,.04)}
.channel>svg{width:19px;height:19px;color:var(--steel);flex:none;margin-top:2px}
.channel b{display:block;font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:#7A8A99;font-weight:700;margin-bottom:4px}
.channel span{font-size:14px;color:var(--ink);word-break:break-word;line-height:1.4}
.channel a{color:var(--steel);border-bottom:1px solid transparent;transition:.15s}
.channel a:hover{border-bottom-color:var(--steel)}

/* ---------- footer ---------- */
.footer{background:var(--navy);color:#B9C8D6;padding-block:clamp(48px,6vw,72px) 28px;font-size:13.5px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:36px}
.footer h4{color:var(--white);font-size:12px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:16px}
.footer a:hover{color:var(--white)}
.footer li{margin-bottom:9px;color:#93A8BB}
.footer .brand{color:var(--white);margin-bottom:14px}
.footer-bottom{margin-top:44px;padding-top:22px;border-top:1px solid var(--line-dark);
  display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;font-size:12px;color:#7E93A6}

/* ---------- forms ---------- */
.field{display:block;margin-bottom:16px}
.field span{display:block;font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#6B7C8D;margin-bottom:7px}
.field input,.field textarea,.field select{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r-sm);
  font:inherit;font-size:14px;color:var(--ink);background:var(--white);transition:.16s;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:0;border-color:var(--steel);box-shadow:0 0 0 3px rgba(30,95,168,.12)}
.field textarea{min-height:130px;resize:vertical}

/* ---------- misc ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}
.note{font-size:12.5px;color:#7A8A99}
.divider{height:1px;background:var(--line);margin-block:clamp(40px,5vw,64px)}
.kicker{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:700}

/* ---------- page hero (inner pages) ---------- */
.page-hero{background:var(--navy);color:var(--white);padding-block:clamp(52px,6vw,88px);position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;
  background:radial-gradient(800px 400px at 85% 0%,rgba(30,95,168,.5),transparent 70%)}
.page-hero .wrap{position:relative;z-index:1}
.page-hero h1{font-size:clamp(30px,4.2vw,52px)}
.page-hero p{margin-top:16px;color:#C5D3E0;max-width:58ch;font-size:clamp(15px,1.4vw,17.5px)}
.crumb{font-size:12px;color:#8FA6BA;letter-spacing:.06em;margin-bottom:16px}
.crumb a:hover{color:var(--white)}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .hero .wrap{grid-template-columns:1fr}
  .hero-art{order:-1;min-height:250px}
  .coil{width:min(300px,70%)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .g4{grid-template-columns:repeat(2,1fr)}
  .partner-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:1240px){
  .brand-name small{display:none}
  .header-inner{gap:10px}
  .lang button{padding:7px 10px;font-size:11.5px}
  .header-actions{gap:8px}
  .nav{
    position:fixed;inset:72px 0 auto 0;background:var(--white);border-bottom:1px solid var(--line);
    flex-direction:column;align-items:flex-start;gap:0;padding:8px var(--pad) 20px;
    transform:translateY(-120%);transition:transform .3s ease;box-shadow:var(--shadow-md);
  }
  .nav.open{transform:none}
  .nav a{padding-block:13px;width:100%;border-bottom:1px solid var(--line)}
  .burger{display:flex}
  .header-actions .btn{display:none}
}

@media (max-width:900px){
  .split,.g2,.g3{grid-template-columns:1fr}
  .g4,.partner-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr}
}

@media (max-width:1320px){
  .nav a{font-size:13px}
  .nav{gap:12px}
  .brand-name{font-size:14px}
}
@media (max-width:1120px){
  .nav a{font-size:12.5px}
  .nav{gap:9px}
  .brand-name small{letter-spacing:.1em}
}

/* 西语导航标签最长，单独收紧 */
html[lang="es"] .nav{gap:clamp(8px,1.1vw,18px)}
html[lang="es"] .nav a{font-size:13px;letter-spacing:-.01em}
@media (max-width:1360px){
  html[lang="es"] .nav a{font-size:12.5px}
  html[lang="es"] .nav{gap:9px}
}