/* ============================================================
   VIDORIO — Foshan International Trade
   Direction: export-grade industrial editorial.
   Carbon navy + logo steel-blue + molten copper. Wireframe globe.
   ============================================================ */

:root{
  --ink:#070B14;
  --panel:#0C1424;
  --panel-2:#101A2E;
  --line:rgba(126,163,209,.16);
  --steel:#4C8FD6;
  --steel-dim:#2F5E93;
  --ice:#C4DBF3;
  --copper:#D98E4A;
  --copper-hot:#F0AD63;
  --paper:#ECF2FA;
  --mute:#8CA0BC;
  --glow-a:rgba(76,143,214,.14);
  --glow-b:rgba(217,142,74,.08);
  --nav-bg:rgba(7,11,20,.72);
  --foot-bg:#05080F;
  --contact-bg:#0A1120;
  --grain-op:.05;
  --display:"Unbounded","Noto Sans SC",sans-serif;
  --body:"Instrument Sans","Noto Sans SC",sans-serif;
  --mono:"IBM Plex Mono","Noto Sans SC",monospace;
  --pad:clamp(20px,5vw,72px);
}

/* daylight theme: 06:00–18:00 local time (set by main.js) */
html[data-theme="light"]{
  --ink:#EEF2F8;
  --panel:#FFFFFF;
  --panel-2:#E7EDF6;
  --line:rgba(15,45,85,.16);
  --steel:#2F6FB0;
  --steel-dim:#3A6E9F;
  --ice:#1E3A5C;
  --copper:#B96F2E;
  --copper-hot:#9A5A22;
  --paper:#0B1524;
  --mute:#55677F;
  --glow-a:rgba(76,143,214,.16);
  --glow-b:rgba(217,142,74,.12);
  --nav-bg:rgba(238,242,248,.78);
  --foot-bg:#E2E8F2;
  --contact-bg:#E4EAF4;
  --grain-op:.025;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--body);
  font-size:16px;
  line-height:1.6;
  overflow-x:hidden;
}
::selection{background:var(--copper);color:var(--ink)}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}

/* Chinese mode: Source Han Serif Black — editorial premium look for CJK headlines */
html[lang^="zh"] h1,html[lang^="zh"] h2,html[lang^="zh"] .brand-text b,html[lang^="zh"] .stat b{
  font-family:"Noto Serif SC","Noto Sans SC",serif;
  font-weight:900;
  letter-spacing:.04em;
}

/* grain overlay */
.grain{
  position:fixed;inset:-50%;z-index:99;pointer-events:none;opacity:var(--grain-op);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  animation:grain 8s steps(10) infinite;
}
@keyframes grain{
  0%,100%{transform:translate(0,0)}20%{transform:translate(-2%,3%)}40%{transform:translate(3%,-2%)}60%{transform:translate(-3%,-3%)}80%{transform:translate(2%,2%)}
}

/* ---------- reveal animation ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s cubic-bezier(.2,.6,.2,1) var(--d,0s),transform .8s cubic-bezier(.2,.6,.2,1) var(--d,0s)}
.reveal.on{opacity:1;transform:none}

/* ================= NAV ================= */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px var(--pad);
  background:var(--nav-bg);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:12px}
.brand-chip{
  background:#F2EFE8;border-radius:10px;padding:5px 10px;
  box-shadow:0 2px 14px rgba(0,0,0,.4);
}
.brand-chip img{height:34px;width:auto}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text b{font-family:var(--display);font-weight:900;font-size:15px;letter-spacing:.14em}
.brand-text i{font-family:var(--mono);font-style:normal;font-size:10px;color:var(--mute);letter-spacing:.22em;text-transform:uppercase}
.links{display:flex;gap:clamp(14px,2.6vw,34px)}
.links a{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ice);position:relative;padding:4px 0}
.links a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--copper);transition:width .3s}
.links a:hover::after{width:100%}
.nav-side{display:flex;align-items:center;gap:14px}
.lang-toggle{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden}
.theme-btn{
  width:36px;height:36px;border-radius:50%;flex:none;cursor:pointer;
  border:1px solid var(--line);background:transparent;color:var(--ice);
  font-size:15px;line-height:1;display:flex;align-items:center;justify-content:center;
  transition:border-color .25s,color .25s,transform .4s;
}
.theme-btn:hover{border-color:var(--copper);color:var(--copper-hot);transform:rotate(30deg)}
.lang-btn{
  background:none;border:0;color:var(--mute);cursor:pointer;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;padding:7px 13px;transition:.25s;
}
.lang-btn.active{background:var(--steel-dim);color:var(--paper)}
.btn-cta{
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  border:1px solid var(--copper);color:var(--copper-hot);padding:9px 16px;border-radius:2px;
  transition:.25s;white-space:nowrap;
}
.btn-cta:hover{background:var(--copper);color:var(--ink)}

/* ================= HERO ================= */
.hero{
  position:relative;min-height:100svh;display:flex;flex-direction:column;justify-content:flex-end;
  padding:140px var(--pad) 0;
  background:
    radial-gradient(900px 520px at 82% 18%,var(--glow-a),transparent 60%),
    radial-gradient(700px 420px at 8% 88%,var(--glow-b),transparent 60%),
    var(--ink);
  overflow:hidden;
}
.globe{
  position:absolute;right:-140px;top:50%;transform:translateY(-58%);
  width:min(760px,90vw);height:auto;pointer-events:none;opacity:.5;
}
.globe *{fill:none;stroke:var(--steel-dim);stroke-width:1}
.globe-spin{transform-origin:300px 300px;animation:spin 90s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.orbit-dot{fill:var(--copper);stroke:none;transform-origin:300px 300px;animation:spin 14s linear infinite}

.hero-inner{position:relative;max-width:980px;padding-bottom:clamp(60px,12vh,120px)}
.kicker{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;letter-spacing:.3em;color:var(--copper-hot);text-transform:uppercase;margin-bottom:22px}
.tick{width:34px;height:1px;background:var(--copper);display:inline-block}
.hero h1{
  font-family:var(--display);font-weight:900;
  font-size:clamp(38px,6.6vw,84px);line-height:1.04;letter-spacing:-.01em;
}
.hero h1 em{
  font-style:normal;color:var(--copper-hot);
}
.hero-lede{margin-top:26px;max-width:560px;color:var(--mute);font-size:17px}
.hero-actions{display:flex;gap:16px;margin-top:36px;flex-wrap:wrap}
.btn-solid{
  font-family:var(--mono);font-size:13px;letter-spacing:.1em;text-transform:uppercase;
  background:var(--steel);color:#04101F;font-weight:600;
  padding:15px 28px;border:1px solid var(--steel);border-radius:2px;cursor:pointer;
  transition:.25s;display:inline-block;
}
.btn-solid:hover{background:var(--ice);border-color:var(--ice)}
.btn-ghost{
  font-family:var(--mono);font-size:13px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ice);padding:15px 24px;border:1px solid var(--line);border-radius:2px;transition:.25s;display:inline-block;
}
.btn-ghost:hover{border-color:var(--ice)}
.hero-meta{display:flex;gap:clamp(18px,4vw,56px);list-style:none;margin-top:52px;flex-wrap:wrap}
.hero-meta li{display:flex;align-items:baseline;gap:10px;font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--mute);text-transform:uppercase}
.hero-meta b{font-family:var(--display);font-size:13px;color:var(--copper-hot)}

/* ticker */
.ticker{
  position:relative;margin:0 calc(var(--pad)*-1);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:var(--panel);overflow:hidden;padding:13px 0;transform:rotate(-.8deg) scale(1.02);
}
.ticker-track{display:flex;gap:34px;white-space:nowrap;width:max-content;animation:slide 36s linear infinite}
.ticker-track span{font-family:var(--display);font-weight:700;font-size:13px;letter-spacing:.22em;color:var(--ice)}
.ticker-track i{color:var(--copper);font-style:normal;font-size:10px;align-self:center}
@keyframes slide{to{transform:translateX(-50%)}}

/* ================= SECTIONS ================= */
.section{padding:clamp(80px,12vh,150px) var(--pad);position:relative}
section[id]{scroll-margin-top:86px}
.sec-head{max-width:760px;margin-bottom:clamp(40px,7vh,80px)}
.sec-no{font-family:var(--mono);font-size:12px;letter-spacing:.3em;color:var(--copper-hot);text-transform:uppercase;margin-bottom:18px}
.section h2{font-family:var(--display);font-weight:900;font-size:clamp(28px,4.4vw,54px);line-height:1.1;letter-spacing:-.01em}
.sec-lede{margin-top:20px;color:var(--mute);max-width:640px;font-size:17px}

/* ---------- product cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:6px;overflow:hidden;
  position:relative;transition:transform .35s cubic-bezier(.2,.6,.2,1),border-color .35s;
}
.card::before{
  content:"";position:absolute;top:0;left:0;height:2px;width:0;z-index:2;
  background:linear-gradient(90deg,var(--copper),var(--copper-hot));transition:width .45s cubic-bezier(.2,.6,.2,1);
}
.card:hover{transform:translateY(-6px);border-color:rgba(126,163,209,.4)}
.card:hover::before{width:100%}
.card-img{aspect-ratio:4/3;overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover;transition:transform .8s cubic-bezier(.2,.6,.2,1);filter:saturate(.92)}
.card:hover .card-img img{transform:scale(1.06)}
.card-body{padding:22px 22px 26px}
.card-en{font-family:var(--mono);font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--steel);margin-bottom:8px}
.card-body h3{font-family:var(--display);font-size:17px;font-weight:700;line-height:1.35}
.card-d{margin-top:12px;color:var(--mute);font-size:14.5px}
.card-tags{margin-top:16px;display:flex;gap:8px;flex-wrap:wrap;list-style:none}
.card-tags span{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;color:var(--ice);border:1px solid var(--line);padding:4px 9px;border-radius:999px}

/* ---------- services ---------- */
.services{background:linear-gradient(var(--panel) 0%,var(--ink) 100%)}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:22px;margin-bottom:clamp(50px,8vh,90px)}
.step{border-top:1px solid var(--line);padding-top:22px;position:relative}
.step b{font-family:var(--display);font-size:34px;font-weight:900;color:transparent;-webkit-text-stroke:1px var(--steel-dim);display:block;margin-bottom:12px}
.step:hover b{-webkit-text-stroke-color:var(--copper)}
.step h3{font-family:var(--display);font-size:16px;font-weight:700;margin-bottom:10px}
.step p{color:var(--mute);font-size:14.5px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px}
.stat{background:var(--panel-2);border:1px solid var(--line);border-radius:6px;padding:26px 22px;text-align:center}
.stat b{font-family:var(--display);font-weight:900;font-size:clamp(22px,2.6vw,32px);color:var(--ice);display:block}
.stat b span{color:var(--copper-hot)}
.stat p{margin-top:8px;font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--mute)}
.demo-flag{border-style:dashed}
.demo-flag b{color:var(--copper);font-size:18px;letter-spacing:.3em}
.demo-flag-inline{font-family:var(--mono);font-style:normal;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--copper);margin-left:10px;border:1px dashed rgba(217,142,74,.5);padding:2px 8px;border-radius:999px}

/* ---------- about ---------- */
.about-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(30px,6vw,80px);align-items:start}
.facts{list-style:none;margin-top:34px;border-top:1px solid var(--line)}
.facts li{display:flex;justify-content:space-between;gap:20px;padding:14px 2px;border-bottom:1px solid var(--line);font-size:14.5px}
.facts span{font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute);padding-top:2px;white-space:nowrap}
.facts b{font-weight:600;text-align:right;color:var(--ice)}
.scope{
  background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:34px 30px;position:relative;overflow:hidden;
}
.scope::after{content:"";position:absolute;right:-70px;top:-70px;width:180px;height:180px;border:1px solid var(--line);border-radius:50%;box-shadow:0 0 0 34px rgba(126,163,209,.05)}
.scope h3{font-family:var(--display);font-size:15px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--copper-hot);margin-bottom:18px}
.scope p{color:var(--mute);font-size:14.5px}
.scope-note{margin-top:18px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--steel);border-top:1px dashed var(--line);padding-top:14px}

/* ---------- contact ---------- */
.contact{background:linear-gradient(var(--ink) 0%,var(--contact-bg) 100%)}
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:clamp(30px,6vw,80px);align-items:start}
.contact h2 em{font-style:normal;color:var(--copper-hot)}
.contact-lines{margin-top:38px}
.contact-lines p{display:flex;align-items:center;gap:18px;padding:16px 0;border-bottom:1px solid var(--line);flex-wrap:wrap}
.contact-lines span{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--mute);min-width:150px}
.contact-lines b{font-family:var(--display);font-size:16px;font-weight:700;color:var(--ice)}
.contact-right{display:grid;grid-template-columns:1fr 200px;gap:22px;align-items:start}
.rfq{display:flex;flex-direction:column;gap:18px;background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:30px 26px}
.rfq label{display:flex;flex-direction:column;gap:8px}
.rfq label span{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--mute)}
.rfq input,.rfq textarea{
  background:var(--ink);border:1px solid var(--line);border-radius:3px;color:var(--paper);
  font-family:var(--body);font-size:15px;padding:12px 14px;transition:border-color .25s;resize:vertical;
}
.rfq input:focus,.rfq textarea:focus{outline:none;border-color:var(--steel)}
.rfq .btn-solid{margin-top:6px}
.form-note{font-size:12px;color:var(--mute);font-family:var(--mono);letter-spacing:.03em}
.qr-card{text-align:center}
.qr-box{
  width:180px;height:180px;margin:0 auto 14px;border:1px dashed var(--steel-dim);border-radius:6px;
  display:flex;align-items:center;justify-content:center;background:var(--panel);
}
.qr-box span{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--mute)}
.qr-card p{font-size:12px;color:var(--mute)}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--line);padding:clamp(40px,7vh,70px) var(--pad) 26px;background:var(--foot-bg)}
.foot-top{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;margin-bottom:40px}
.foot-brand{font-family:var(--display);font-weight:900;font-size:22px;letter-spacing:.1em}
.foot-brand i{font-style:normal;font-size:13px;color:var(--copper-hot);margin-left:10px;letter-spacing:.3em}
.foot-cn{margin-top:10px;color:var(--mute);font-size:13px}
.foot-links{display:flex;gap:26px;align-items:flex-start;flex-wrap:wrap}
.foot-links a{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ice)}
.foot-links a:hover{color:var(--copper-hot)}
.foot-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:22px;font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--mute);text-transform:uppercase}

/* ---------- back to top ---------- */
.to-top{
  position:fixed;right:26px;bottom:26px;z-index:60;
  width:52px;height:52px;border-radius:50%;cursor:pointer;
  background:var(--panel);border:1px solid var(--copper);color:var(--copper-hot);
  font-family:var(--mono);font-size:18px;line-height:1;
  display:flex;align-items:center;justify-content:center;
  opacity:0;transform:translateY(18px);pointer-events:none;
  transition:opacity .35s,transform .35s,background .25s;
  box-shadow:0 6px 24px rgba(0,0,0,.35);
}
.to-top.show{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:var(--copper);color:var(--ink)}
html[data-theme="light"] .brand-chip{box-shadow:0 1px 8px rgba(11,21,36,.15);border:1px solid var(--line)}
html[data-theme="light"] .to-top{box-shadow:0 6px 20px rgba(11,21,36,.18)}
html[data-theme="light"] .ticker{background:var(--panel)}

/* ================= RESPONSIVE ================= */
@media (max-width:960px){
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .contact-right{grid-template-columns:1fr}
  .qr-box{margin-bottom:0}
  .links{display:none}
}
@media (max-width:640px){
  .nav{padding:12px 18px}
  .brand-text{display:none}
  .hero{padding-top:110px}
  .globe{right:-45%;top:12%;transform:none;width:130vw;opacity:.3}
  .stats{grid-template-columns:1fr 1fr}
  .contact-lines span{min-width:100%}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
  .reveal{opacity:1;transform:none}
}