/* =========================================================
   COOLSTER — Premium AC Spare Parts
   Shared stylesheet
   ========================================================= */

:root{
  --bg:        #060912;
  --bg-2:      #0a1020;
  --panel:     #0e1626;
  --panel-2:   #111d33;
  --ink:       #eaf2ff;
  --muted:     #9fb1cc;
  --faint:     #6b7d99;
  --line:      rgba(255,255,255,.08);
  --line-2:    rgba(255,255,255,.14);

  --cyan:      #22d3ee;
  --sky:       #38bdf8;
  --blue:      #2f7bff;
  --ice:       #a9e8ff;
  --grad:      linear-gradient(120deg,#22d3ee 0%,#38bdf8 45%,#2f7bff 100%);
  --grad-soft: linear-gradient(120deg,rgba(34,211,238,.16),rgba(47,123,255,.16));

  --radius:    20px;
  --radius-sm: 14px;
  --shadow:    0 30px 80px -30px rgba(0,0,0,.7);
  --glow:      0 0 0 1px rgba(56,189,248,.25), 0 20px 60px -20px rgba(56,189,248,.35);

  --maxw: 1200px;
  --font: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --display: "Space Grotesk", var(--font);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  background:var(--bg);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

/* Ambient animated aurora background */
body::before{
  content:"";
  position:fixed; inset:-20% -10% auto -10%;
  height:120vh; z-index:-2;
  background:
    radial-gradient(40vw 40vw at 12% 8%,  rgba(34,211,238,.18), transparent 60%),
    radial-gradient(45vw 45vw at 88% 0%,  rgba(47,123,255,.20), transparent 60%),
    radial-gradient(50vw 50vw at 50% 120%,rgba(56,189,248,.10), transparent 60%);
  filter:blur(10px);
  animation:floatbg 22s ease-in-out infinite alternate;
}
body::after{
  content:"";
  position:fixed; inset:0; z-index:-1; pointer-events:none;
  background-image:radial-gradient(rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:46px 46px;
  mask-image:radial-gradient(70% 60% at 50% 20%,#000,transparent 90%);
}
@keyframes floatbg{
  0%{transform:translate3d(0,0,0) scale(1)}
  100%{transform:translate3d(0,-4%,0) scale(1.08)}
}

a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:24px}

/* ---------- Typography ---------- */
h1,h2,h3{font-family:var(--display);font-weight:700;line-height:1.08;letter-spacing:-.02em;margin:0}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.78rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--grad);border-radius:2px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{color:var(--muted);font-size:1.08rem;max-width:60ch}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 26px;border-radius:999px;font-weight:600;font-size:.96rem;
  border:1px solid transparent;cursor:pointer;transition:.25s ease;white-space:nowrap;
}
.btn .arrow{transition:transform .25s ease}
.btn:hover .arrow{transform:translateX(4px)}
.btn-primary{background:var(--grad);color:#03101f;box-shadow:var(--glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(56,189,248,.4),0 26px 60px -18px rgba(56,189,248,.55)}
.btn-ghost{background:rgba(255,255,255,.04);border-color:var(--line-2);color:var(--ink)}
.btn-ghost:hover{background:rgba(255,255,255,.09);transform:translateY(-2px)}

/* ---------- Navbar ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  transition:.3s ease;
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  margin:14px auto;max-width:var(--maxw);
  padding:10px 14px 10px 20px;
  background:rgba(10,16,32,.55);
  border:1px solid var(--line);
  border-radius:999px;
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  width:calc(100% - 48px);
}
.nav.scrolled .nav-inner{background:rgba(8,12,24,.85);box-shadow:var(--shadow)}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:30px;width:auto}
.brand b{font-family:var(--display);font-size:1.15rem;letter-spacing:.02em}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{
  padding:9px 16px;border-radius:999px;color:var(--muted);font-weight:500;font-size:.95rem;
  transition:.2s ease;
}
.nav-links a:hover{color:var(--ink);background:rgba(255,255,255,.05)}
.nav-links a.active{color:var(--ink);background:var(--grad-soft);border:1px solid var(--line-2)}
.nav-cta{margin-left:8px;padding:11px 20px}
.burger{display:none;background:none;border:0;color:var(--ink);cursor:pointer;padding:8px}
.burger svg{width:26px;height:26px}

/* ---------- Sections ---------- */
section{position:relative}
.section{padding:96px 0}
.section-head{max-width:720px;margin-bottom:54px}
.section-head h2{font-size:clamp(2rem,4.5vw,3.1rem);margin:16px 0 14px}
.center{margin-inline:auto;text-align:center}
.center .eyebrow{justify-content:center}

/* ---------- Hero ---------- */
.hero{padding:72px 0 90px;position:relative}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(2.6rem,6vw,4.6rem);margin:20px 0 22px}
.hero p.lead{font-size:1.15rem}
.hero-actions{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.hero-stats{display:flex;gap:34px;margin-top:46px;flex-wrap:wrap}
.hero-stats .num{font-family:var(--display);font-size:1.9rem;font-weight:700}
.hero-stats .lbl{color:var(--faint);font-size:.85rem}

.hero-visual{position:relative;display:grid;place-items:center;min-height:420px}
.hero-disc{
  position:absolute;width:min(440px,90%);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle at 50% 40%,rgba(56,189,248,.35),rgba(47,123,255,.08) 55%,transparent 70%);
  filter:blur(6px);animation:pulse 6s ease-in-out infinite}
@keyframes pulse{50%{transform:scale(1.07);opacity:.85}}
.hero-card{
  position:relative;z-index:2;width:min(380px,88%);
  background:linear-gradient(180deg,#ffffff,#eaf1f8);
  border-radius:32px;padding:26px;box-shadow:var(--shadow);
  animation:bob 5.5s ease-in-out infinite;
}
@keyframes bob{50%{transform:translateY(-14px)}}
.hero-card img{margin-inline:auto;max-height:320px;object-fit:contain;
  filter:drop-shadow(0 30px 30px rgba(0,0,0,.25))}
.hero-badge{
  position:absolute;z-index:3;background:rgba(10,16,32,.8);backdrop-filter:blur(10px);
  border:1px solid var(--line-2);border-radius:14px;padding:12px 16px;
  display:flex;align-items:center;gap:10px;box-shadow:var(--shadow);font-size:.85rem;
}
.hero-badge .dot{width:9px;height:9px;border-radius:50%;background:var(--cyan);box-shadow:0 0 12px var(--cyan)}
.hero-badge.b1{top:6%;left:-2%;animation:bob 5.5s ease-in-out .4s infinite}
.hero-badge.b2{bottom:8%;right:-4%;animation:bob 6s ease-in-out .9s infinite}

/* ---------- Marquee ---------- */
.marquee{border-block:1px solid var(--line);padding:18px 0;overflow:hidden;background:rgba(255,255,255,.015)}
.marquee-track{display:flex;gap:56px;width:max-content;animation:scroll 28s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee-track span{font-family:var(--display);font-weight:600;color:var(--faint);
  font-size:1.05rem;display:flex;align-items:center;gap:56px;letter-spacing:.02em}
.marquee-track span::after{content:"❄";color:var(--cyan)}
@keyframes scroll{to{transform:translateX(-50%)}}

/* ---------- Feature row (bento) ---------- */
.bento{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:26px;
  position:relative;overflow:hidden;transition:.3s ease;
}
.card::after{content:"";position:absolute;inset:0;border-radius:inherit;
  background:var(--grad-soft);opacity:0;transition:.3s ease;z-index:0}
.card:hover{transform:translateY(-6px);border-color:var(--line-2)}
.card:hover::after{opacity:1}
.card>*{position:relative;z-index:1}
.card .ico{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;
  background:var(--grad-soft);border:1px solid var(--line-2);margin-bottom:16px;font-size:1.4rem}
.card h3{font-size:1.15rem;margin-bottom:8px}
.card p{color:var(--muted);font-size:.94rem;margin:0}
.bento .span2{grid-column:span 2}

/* ---------- Products ---------- */
.filters{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:34px}
.chip{
  padding:9px 18px;border-radius:999px;border:1px solid var(--line-2);
  background:rgba(255,255,255,.03);color:var(--muted);font-size:.9rem;font-weight:500;
  cursor:pointer;transition:.2s ease;
}
.chip:hover{color:var(--ink)}
.chip.active{background:var(--grad);color:#03101f;border-color:transparent;font-weight:600}

.products{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.product{
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  transition:.35s cubic-bezier(.2,.7,.2,1);display:flex;flex-direction:column;
}
.product:hover{transform:translateY(-8px);border-color:var(--line-2);box-shadow:var(--shadow)}
.product-media{
  position:relative;aspect-ratio:4/3;background:linear-gradient(160deg,#ffffff,#e9f1f8);
  display:grid;place-items:center;padding:26px;overflow:hidden;
}
.product-media img{max-height:100%;object-fit:contain;transition:transform .5s ease;
  filter:drop-shadow(0 18px 22px rgba(0,0,0,.18))}
.product:hover .product-media img{transform:scale(1.07) rotate(-1deg)}
.product-tag{
  position:absolute;top:14px;left:14px;font-size:.72rem;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;padding:6px 12px;border-radius:999px;
  background:rgba(6,9,18,.8);color:var(--ice);backdrop-filter:blur(6px);
}
.product-body{padding:22px 22px 24px;flex:1;display:flex;flex-direction:column}
.product-body h3{font-size:1.18rem;margin-bottom:8px}
.product-body p{color:var(--muted);font-size:.92rem;margin:0 0 18px;flex:1}
.product-link{display:inline-flex;align-items:center;gap:8px;color:var(--cyan);font-weight:600;font-size:.92rem}
.product-link .arrow{transition:transform .25s ease}
.product:hover .product-link .arrow{transform:translateX(5px)}

/* ---------- Stats band ---------- */
.band{
  border:1px solid var(--line);border-radius:28px;padding:48px;
  background:
    radial-gradient(60% 120% at 0% 0%,rgba(34,211,238,.12),transparent 60%),
    radial-gradient(60% 120% at 100% 100%,rgba(47,123,255,.12),transparent 60%),
    var(--panel);
}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stats .num{font-family:var(--display);font-size:clamp(2.2rem,5vw,3.2rem);font-weight:700}
.stats .lbl{color:var(--muted);font-size:.92rem;margin-top:4px}

/* ---------- Split / about ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center}
.about-copy p{color:var(--muted);margin:0 0 18px}
.about-copy p:first-of-type::first-letter{
  font-family:var(--display);font-size:3.2rem;font-weight:700;float:left;line-height:.8;
  padding:6px 14px 0 0;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.media-frame{
  border-radius:24px;overflow:hidden;border:1px solid var(--line-2);position:relative;
  background:linear-gradient(160deg,#ffffff,#e9f1f8);padding:30px;box-shadow:var(--shadow);
}
.media-frame img{margin-inline:auto;max-height:380px;object-fit:contain}

/* values grid */
.values{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:8px}

/* timeline */
.timeline{position:relative;margin-top:20px;padding-left:30px}
.timeline::before{content:"";position:absolute;left:8px;top:6px;bottom:6px;width:2px;background:var(--grad)}
.tl-item{position:relative;padding:0 0 30px 22px}
.tl-item::before{content:"";position:absolute;left:-30px;top:4px;width:18px;height:18px;border-radius:50%;
  background:var(--bg);border:3px solid var(--cyan);box-shadow:0 0 14px rgba(34,211,238,.6)}
.tl-item h4{font-family:var(--display);margin:0 0 4px;font-size:1.05rem}
.tl-item .yr{color:var(--cyan);font-weight:700;font-size:.85rem;letter-spacing:.06em}
.tl-item p{color:var(--muted);margin:6px 0 0;font-size:.94rem}

/* ---------- CTA ---------- */
.cta{
  border-radius:28px;padding:64px 48px;text-align:center;position:relative;overflow:hidden;
  background:
    radial-gradient(50% 120% at 50% 0%,rgba(56,189,248,.22),transparent 70%),
    linear-gradient(180deg,var(--panel-2),var(--bg-2));
  border:1px solid var(--line-2);
}
.cta h2{font-size:clamp(2rem,5vw,3.2rem);margin-bottom:16px}
.cta .btn{margin-top:26px}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:40px;align-items:start}
.info-card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:26px;display:flex;gap:16px;align-items:flex-start;transition:.25s ease;
}
.info-card:hover{border-color:var(--line-2);transform:translateY(-3px)}
.info-card .ico{flex:none;width:46px;height:46px;border-radius:12px;display:grid;place-items:center;
  background:var(--grad-soft);border:1px solid var(--line-2);font-size:1.2rem}
.info-card h4{font-family:var(--display);margin:2px 0 4px;font-size:1rem}
.info-card a,.info-card p{color:var(--muted);margin:0;font-size:.95rem;word-break:break-word}
.info-card a:hover{color:var(--cyan)}
.info-stack{display:grid;gap:16px}

form.glass{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:30px;
}
.field{margin-bottom:18px}
.field label{display:block;font-size:.85rem;color:var(--muted);margin-bottom:8px;font-weight:500}
.field input,.field textarea,.field select{
  width:100%;padding:14px 16px;border-radius:12px;border:1px solid var(--line-2);
  background:rgba(255,255,255,.03);color:var(--ink);font-family:inherit;font-size:.96rem;transition:.2s ease;
}
.field textarea{min-height:130px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,211,238,.15);background:rgba(255,255,255,.05)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-note{font-size:.82rem;color:var(--faint);margin-top:14px}

.map-frame{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);margin-top:40px;line-height:0}
.map-frame iframe{width:100%;height:360px;border:0;filter:grayscale(.3) invert(.92) hue-rotate(180deg) contrast(.9)}

/* page hero (sub pages) */
.page-hero{padding:80px 0 40px;text-align:center}
.page-hero h1{font-size:clamp(2.4rem,6vw,4rem);margin:18px 0 16px}
.page-hero .lead{margin-inline:auto}
.crumbs{color:var(--faint);font-size:.85rem;letter-spacing:.05em}
.crumbs a:hover{color:var(--cyan)}

/* ---------- Footer ---------- */
.footer{margin-top:90px;border-top:1px solid var(--line);background:linear-gradient(180deg,transparent,rgba(8,12,24,.7))}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1.4fr;gap:48px;padding:64px 0 44px}
.footer .brand img{height:34px}
.footer p.about{color:var(--muted);margin:18px 0 0;max-width:34ch;font-size:.95rem}
.footer h5{font-family:var(--display);font-size:.95rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink);margin:0 0 18px}
.footer .links{display:grid;gap:12px}
.footer .links a{color:var(--muted);font-size:.95rem;transition:.2s}
.footer .links a:hover{color:var(--cyan);transform:translateX(3px)}
.addr-block{display:grid;gap:14px}
.addr-line{display:flex;gap:12px;align-items:flex-start;color:var(--muted);font-size:.95rem}
.addr-line .ico{flex:none;color:var(--cyan);margin-top:2px}
.addr-line a{color:var(--muted)}
.addr-line a:hover{color:var(--cyan)}
.addr-zh{color:var(--faint);font-size:.9rem;line-height:1.7}
.footer-bottom{border-top:1px solid var(--line);padding:22px 0;display:flex;
  justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;color:var(--faint);font-size:.85rem}
.socials{display:flex;gap:10px}
.socials a{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;
  border:1px solid var(--line-2);background:rgba(255,255,255,.03);transition:.2s}
.socials a:hover{background:var(--grad);color:#03101f;transform:translateY(-3px)}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .bento{grid-template-columns:repeat(2,1fr)}
  .products{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr;gap:36px}
}
@media (max-width:820px){
  .nav-links{
    position:absolute;top:74px;right:24px;left:24px;flex-direction:column;align-items:stretch;gap:6px;
    background:rgba(8,12,24,.96);border:1px solid var(--line-2);border-radius:18px;padding:14px;
    backdrop-filter:blur(16px);display:none;box-shadow:var(--shadow);
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 16px}
  .nav-cta{margin-left:0;text-align:center;justify-content:center}
  .burger{display:block}
  .hero-grid,.split,.contact-grid{grid-template-columns:1fr;gap:36px}
  .hero-visual{min-height:360px}
  .section{padding:72px 0}
  .band,.cta{padding:36px 24px}
}
@media (max-width:560px){
  .products,.bento,.stats,.values,.two,.footer-top{grid-template-columns:1fr}
  .bento .span2{grid-column:auto}
  .hero-stats{gap:22px}
  .footer-bottom{flex-direction:column;text-align:center}
}