/* Boyuanda — Marine Equipment Export | lightweight, no dependencies */
:root{
  --bg:#faf9f6; --surface:#ffffff; --ink:#1c2530; --ink-2:#4b5766; --ink-3:#8a94a1;
  --line:#e5e2da; --accent:#33617e; --accent-deep:#234a61; --sand:#f1eee7;
  --radius:10px; --maxw:1140px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.65;font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- bilingual switch (class-based, old-browser safe) ---------- */
.t-zh{display:none}
body.zh .t-en{display:none}
body.zh .t-zh{display:inline}
.lang-toggle{
  background:transparent;border:1px solid var(--line);border-radius:20px;
  padding:5px 14px;font:inherit;font-size:13px;font-weight:600;color:var(--ink-2);
  cursor:pointer;letter-spacing:.02em;transition:border-color .15s,color .15s;
}
.lang-toggle:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(250,249,246,.92);
  backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-weight:700;letter-spacing:.14em;font-size:18px;color:var(--ink)}
.brand span{color:var(--accent)}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{font-size:14px;color:var(--ink-2);letter-spacing:.02em;transition:color .15s}
.nav-links a:hover{color:var(--accent)}
.nav-cta{
  background:var(--accent);color:#fff!important;padding:8px 18px;border-radius:6px;
  font-weight:600;transition:background .15s;
}
.nav-cta:hover{background:var(--accent-deep)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle svg{width:24px;height:24px;stroke:var(--ink)}

/* ---------- hero ---------- */
.hero{
  background:
    radial-gradient(1100px 480px at 78% -10%, rgba(51,97,126,.14), transparent 60%),
    linear-gradient(180deg,#f4f2ec 0%,var(--bg) 100%);
  border-bottom:1px solid var(--line);
}
.hero-inner{padding:96px 0 84px;max-width:820px}
.eyebrow{
  font-size:13px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin-bottom:18px;
}
.hero h1{font-size:clamp(30px,4.6vw,48px);line-height:1.18;font-weight:700;letter-spacing:-.01em}
.hero p.lede{margin-top:20px;font-size:18px;color:var(--ink-2);max-width:640px}
.hero-actions{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-block;padding:12px 26px;border-radius:6px;font-weight:600;font-size:15px;
  transition:background .15s,border-color .15s;border:0;cursor:pointer;font-family:inherit;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-deep)}
.btn-ghost{border:1px solid #c8cdd4;color:var(--ink);background:transparent}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.trust-strip{
  display:flex;flex-wrap:wrap;gap:10px 28px;align-items:center;
  padding:18px 0 26px;color:var(--ink-3);font-size:13px;letter-spacing:.04em;
}
.trust-strip b{color:var(--ink-2);font-weight:600}
.trust-sep{color:var(--line)}

/* ---------- sections ---------- */
section{padding:76px 0}
.section-head{max-width:680px;margin-bottom:44px}
.section-head h2{font-size:clamp(24px,3vw,32px);letter-spacing:-.01em}
.section-head p{margin-top:12px;color:var(--ink-2)}
.section-num{
  font-size:13px;color:var(--accent);font-weight:600;letter-spacing:.18em;
  text-transform:uppercase;margin-bottom:10px;
}

/* ---------- product grid ---------- */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .18s,transform .18s;
}
.card:hover{box-shadow:0 10px 30px rgba(28,37,48,.08);transform:translateY(-2px)}
.card-media{background:#f3f1ea;aspect-ratio:4/3;padding:22px;min-height:0}
.card-media img{width:100%;height:100%;object-fit:contain}
.card-body{padding:22px 22px 24px;display:flex;flex-direction:column;gap:10px;flex:1}
.card-tag{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:600}
.card h3{font-size:19px;line-height:1.3}
.card p{font-size:14.5px;color:var(--ink-2);flex:1}
.card-link{font-size:14px;font-weight:600;color:var(--accent);margin-top:4px}
.card-link::after{content:" →"}

/* ---------- product detail ---------- */
.detail{border-top:1px solid var(--line)}
.detail-inner{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:start}
.detail h2{font-size:clamp(24px,3vw,30px);letter-spacing:-.01em;line-height:1.25}
.detail .sub{margin-top:14px;color:var(--ink-2);font-size:16.5px}
.selling-points{margin-top:26px;display:grid;gap:12px}
.selling-points li{
  list-style:none;padding-left:26px;position:relative;font-size:15px;color:var(--ink-2);
}
.selling-points li::before{
  content:"";position:absolute;left:0;top:.5em;width:14px;height:2px;background:var(--accent);
}
.spec-table{margin-top:30px;width:100%;border-collapse:collapse;font-size:14px}
.spec-table caption{
  text-align:left;font-size:13px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink-3);font-weight:600;padding-bottom:10px;
}
.spec-table th,.spec-table td{padding:9px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.spec-table th{color:var(--ink);font-weight:600;width:44%;background:transparent}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:0}
.apps{margin-top:26px;font-size:14px;color:var(--ink-2)}
.apps b{color:var(--ink)}

/* gallery */
.gallery{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.gallery figure{
  background:#f3f1ea;border:1px solid var(--line);border-radius:var(--radius);
  aspect-ratio:4/3;padding:16px;overflow:hidden;min-height:0;position:relative;
}
.gallery figure:first-child{grid-column:1/-1;aspect-ratio:16/10}
.gallery img{width:100%;height:100%;object-fit:contain}
.gallery figcaption{
  position:absolute;left:-9999px;
}

/* ---------- boats ---------- */
.boat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.boat-media{padding:0;aspect-ratio:16/8;background:#e8e6df}
.boat-media img{object-fit:cover}
.boat-card-media{padding:0}
.boat-card-media img{object-fit:cover}
.boat-specs{list-style:none;display:grid;gap:6px;font-size:13.5px;color:var(--ink-2)}
.boat-specs b{color:var(--ink);font-weight:600;margin-right:8px}
.boat-use{font-size:13.5px;color:var(--ink-3);flex:0 0 auto}
#boats .apps{margin-top:28px}

/* ---------- why us ---------- */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.why-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px}
.why-item .n{font-size:13px;color:var(--accent);font-weight:700;letter-spacing:.1em}
.why-item h3{font-size:16.5px;margin:10px 0 8px}
.why-item p{font-size:14px;color:var(--ink-2)}

/* ---------- process ---------- */
.process-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step}
.step{border-top:2px solid var(--accent);padding-top:18px}
.step .num{font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.12em}
.step h3{font-size:16.5px;margin:8px 0 6px}
.step p{font-size:14px;color:var(--ink-2)}

/* ---------- markets ---------- */
.markets{background:var(--sand);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.market-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.market{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px}
.market h3{font-size:17px;margin-bottom:8px}
.market p{font-size:14px;color:var(--ink-2)}

/* ---------- about ---------- */
.about-inner{display:grid;grid-template-columns:1.15fr 1fr;gap:48px;align-items:start}
#about .sub{margin-top:14px;color:var(--ink-2);font-size:16.5px}
#about h2{font-size:clamp(24px,3vw,30px);letter-spacing:-.01em;line-height:1.25}
/* company credentials card */
.credential-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;display:flex;flex-direction:column;gap:18px;
}
.cred-head{display:flex;gap:14px;align-items:center}
.cred-badge{
  width:44px;height:44px;flex:0 0 44px;border-radius:10px;
  background:rgba(51,97,126,.1);display:grid;place-items:center;
}
.cred-badge svg{width:24px;height:24px;stroke:var(--accent)}
.cred-title{font-size:16.5px;font-weight:700;color:var(--ink);line-height:1.3}
.cred-sub{font-size:12.5px;color:var(--ink-3);letter-spacing:.04em}
.cred-list{display:flex;flex-direction:column}
.cred-row{
  display:grid;grid-template-columns:132px 1fr;gap:14px;
  padding:10px 0;border-top:1px solid var(--line);font-size:13.5px;
}
.cred-row dt{color:var(--ink-3);font-weight:600;padding-top:1px}
.cred-row dd{color:var(--ink);line-height:1.5}
.cred-row .muted{color:var(--ink-3);font-size:12.5px}
.cred-row .mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:.04em}
.cred-verify{font-size:12.5px;color:var(--ink-3)}
.cred-verify a{color:var(--accent);font-weight:600}
.license-thumb{
  display:flex;align-items:center;gap:14px;width:100%;text-align:left;cursor:pointer;
  background:var(--sand);border:1px solid var(--line);border-radius:8px;padding:10px;
  font:inherit;transition:border-color .15s,box-shadow .15s;
}
.license-thumb:hover{border-color:var(--accent);box-shadow:0 4px 14px rgba(28,37,48,.08)}
.license-thumb img{width:84px;height:60px;object-fit:cover;border-radius:5px;flex:0 0 84px}
.license-thumb-label{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13.5px;font-weight:600;color:var(--accent);
}
.license-thumb-label svg{width:16px;height:16px;stroke:var(--accent)}

/* lightbox */
.lightbox{position:fixed;inset:0;z-index:200;display:grid;place-items:center;padding:24px}
.lightbox[hidden]{display:none}
.lightbox-backdrop{position:absolute;inset:0;background:rgba(16,22,29,.72);backdrop-filter:blur(3px)}
.lightbox-figure{
  position:relative;z-index:1;max-width:min(860px,94vw);background:#fff;border-radius:10px;
  padding:16px;box-shadow:0 24px 64px rgba(0,0,0,.35);margin:0;
}
.lightbox-figure img{max-width:100%;max-height:76vh;object-fit:contain;border-radius:6px;margin:0 auto}
.lightbox-figure figcaption{margin-top:10px;font-size:12.5px;color:var(--ink-3);text-align:center}
.lightbox-close{
  position:absolute;top:-14px;right:-14px;width:36px;height:36px;border-radius:50%;
  background:var(--ink);color:#fff;border:0;font-size:20px;line-height:1;cursor:pointer;
}
.lightbox-close:hover{background:var(--accent)}

/* ---------- contact ---------- */
.contact-inner{display:grid;grid-template-columns:1.2fr 1fr;gap:48px}
.contact h2{font-size:clamp(24px,3vw,32px)}
.contact p{margin-top:14px;color:var(--ink-2);max-width:520px}
.checklist{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px 26px;margin-top:22px}
.checklist h3{font-size:15px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);margin-bottom:14px}
.checklist ul{display:grid;gap:10px}
.checklist li{list-style:none;font-size:14.5px;color:var(--ink-2);padding-left:22px;position:relative}
.checklist li::before{content:"";position:absolute;left:0;top:.55em;width:10px;height:2px;background:var(--accent)}
.contact-meta{margin-top:22px;font-size:14.5px;color:var(--ink-2)}
.contact-meta b{color:var(--ink)}
.mail-link{color:var(--accent);font-weight:600}

/* ---------- inquiry form ---------- */
.inquiry-form{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;display:grid;gap:14px;align-self:start;
}
.inquiry-form label{display:grid;gap:6px;font-size:13px;font-weight:600;color:var(--ink-2)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.inquiry-form input,.inquiry-form select,.inquiry-form textarea{
  font:inherit;font-size:14.5px;font-weight:400;color:var(--ink);background:#fff;
  border:1px solid var(--line);border-radius:6px;padding:10px 12px;width:100%;resize:vertical;
}
.inquiry-form input:focus,.inquiry-form select:focus,.inquiry-form textarea:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(51,97,126,.15);
}
.inquiry-form .btn{width:100%}
.form-note{font-size:13px;color:var(--ink-3)}
.form-note a{color:var(--accent);font-weight:600}
.form-status{font-size:14px;font-weight:600;color:var(--accent-deep);min-height:1.2em}
.form-status.error{color:#a33}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:34px 0;color:var(--ink-3);font-size:13.5px}
.footer-inner{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}

/* ---------- reveal (progressive enhancement: hidden only when JS active) ---------- */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.js .reveal.visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .js .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .why-grid,.process-grid{grid-template-columns:repeat(2,1fr)}
  .detail-inner,.contact-inner{grid-template-columns:1fr;gap:34px}
  .boat-grid{grid-template-columns:1fr}
  .about-inner{grid-template-columns:1fr;gap:34px}
}
@media (max-width:640px){
  .nav-links{
    display:none;position:absolute;top:64px;left:0;right:0;background:var(--bg);
    flex-direction:column;align-items:flex-start;gap:0;padding:8px 24px 16px;
    border-bottom:1px solid var(--line);
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav-links a:last-child{border-bottom:0}
  .lang-toggle{margin:12px 0 4px;align-self:flex-start}
  .nav-cta{display:inline-block;margin-top:10px}
  .nav-toggle{display:block}
  section{padding:56px 0}
  .hero-inner{padding:64px 0 56px}
  .product-grid{grid-template-columns:1fr}
  .market-grid{grid-template-columns:1fr}
  .gallery figure:first-child{aspect-ratio:4/3}
  .form-row{grid-template-columns:1fr}
  .boat-media{aspect-ratio:4/3}
  .cred-row{grid-template-columns:1fr;gap:2px;padding:9px 0}
  .lightbox{padding:12px}
  .lightbox-figure{padding:10px}
  .lightbox-close{top:-10px;right:-6px}
}