/* ===========================================================================
   RS Build Labs — design system (single source of truth).
   Dark, precise, "lab"-grade PC hardware aesthetic. Electric-blue accent.
   Every colour/space/type decision is a token in :root so the whole brand can
   be re-themed from one place.
   =========================================================================== */
:root{
  color-scheme: dark;

  /* Palette — matches the RS Bio Labs acid-green / black identity */
  --bg:#0a0a0a;            /* page */
  --bg-2:#101010;          /* raised sections */
  --surface:#161616;       /* cards */
  --surface-2:#1d1d1d;     /* inputs / hovers */
  --line:rgba(240,237,230,.10);
  --line-strong:rgba(240,237,230,.18);
  --text:#f0ede6;          /* warm off-white */
  --muted:#a0a090;
  --faint:#6e6e62;

  --accent:#c8f542;        /* acid green */
  --accent-2:#c8f542;      /* highlight (same acid) */
  --accent-ink:#0a0a0a;    /* text on acid */
  --green:#c8f542;         /* in stock */
  --amber:#ffb432;         /* low / pre-order */
  --red:#e84025;

  --grad: linear-gradient(135deg,#c8f542,#b2e02a);

  /* Type */
  --f-display:'Space Grotesk','Segoe UI',system-ui,sans-serif;
  --f-body:'Inter','Segoe UI',system-ui,sans-serif;
  --f-mono:'JetBrains Mono','SFMono-Regular',Menlo,monospace;

  /* Radius / shadow / layout */
  --r:14px;
  --r-sm:9px;
  --r-lg:22px;
  --shadow:0 18px 50px rgba(0,0,0,.45);
  --shadow-accent:0 14px 40px rgba(200,245,66,.28);
  --maxw:1240px;
  --gutter:24px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  background:var(--bg);color:var(--text);
  font-family:var(--f-body);font-size:15px;line-height:1.6;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:700;line-height:1.08;letter-spacing:-.02em;}
.mono{font-family:var(--f-mono);}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter);}
.section{padding:72px 0;}
.section-2{background:var(--bg-2);}
.eyebrow{font-family:var(--f-mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--accent-2);}
.sec-head{max-width:640px;margin-bottom:34px;}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.sec-head h2{font-size:clamp(28px,3.6vw,40px);margin:12px 0 10px;}
.sec-head p{color:var(--muted);font-size:16px;}
.muted{color:var(--muted);}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--f-display);font-weight:600;font-size:14px;
  padding:12px 22px;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:transform .12s,background .15s,border-color .15s,box-shadow .15s;white-space:nowrap;}
.btn:hover{transform:translateY(-2px);}
.btn-primary{background:var(--grad);color:var(--accent-ink);box-shadow:var(--shadow-accent);}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line-strong);}
.btn-ghost:hover{border-color:var(--accent);color:#fff;}
.btn-sm{padding:9px 16px;font-size:13px;}
.btn-block{width:100%;justify-content:center;}

/* Tags / pills */
.tag{display:inline-flex;align-items:center;gap:6px;font-family:var(--f-mono);font-size:11px;letter-spacing:.06em;
  text-transform:uppercase;padding:4px 10px;border-radius:999px;border:1px solid var(--line-strong);color:var(--muted);}
.tag-stock{color:var(--green);border-color:rgba(52,211,153,.4);}
.tag-pre{color:var(--amber);border-color:rgba(251,191,36,.4);}
.tag-out{color:var(--faint);}
.tag-hot{background:var(--grad);color:var(--accent-ink);border:none;font-weight:700;}

/* ---- Header / nav ---- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(10,10,10,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);}
.nav{display:flex;align-items:center;gap:28px;height:72px;}
.brand{display:flex;align-items:center;gap:11px;}
.brand .logo{width:38px;height:38px;flex:none;}
.brand .wordmark{font-family:var(--f-display);font-weight:700;font-size:20px;letter-spacing:.01em;}
.brand .wordmark b{color:var(--accent);}
.brand .wordmark small{display:block;font-family:var(--f-mono);font-size:8.5px;letter-spacing:.34em;color:var(--faint);text-transform:uppercase;margin-top:1px;}
.nav-links{display:flex;gap:26px;margin-left:8px;}
.nav-links a{font-size:14px;color:var(--muted);font-weight:500;transition:color .15s;}
.nav-links a:hover{color:var(--text);}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:12px;}
.search{display:flex;align-items:center;gap:8px;background:var(--surface-2);border:1px solid var(--line);border-radius:999px;padding:8px 14px;min-width:230px;color:var(--faint);}
.search input{background:none;border:none;outline:none;color:var(--text);font-family:var(--f-body);font-size:14px;width:100%;}
.icon-btn{position:relative;width:42px;height:42px;display:grid;place-items:center;border-radius:11px;background:var(--surface-2);border:1px solid var(--line);cursor:pointer;color:var(--text);}
.icon-btn:hover{border-color:var(--accent);}
.icon-btn .count{position:absolute;top:-6px;right:-6px;min-width:19px;height:19px;padding:0 5px;border-radius:999px;background:var(--grad);color:var(--accent-ink);font-size:11px;font-weight:800;display:grid;place-items:center;}
.hamburger{display:none;}
@media(max-width:980px){
  .nav-links,.search{display:none;}
  .hamburger{display:grid;}
}

/* ---- Hero ---- */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(1000px 500px at 85% -10%,rgba(200,245,66,.22),transparent 60%),
  radial-gradient(800px 500px at 0% 110%,rgba(200,245,66,.14),transparent 55%);
  border-bottom:1px solid var(--line);}
.hero-in{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding-block:70px 80px;}
.hero h1{font-size:clamp(38px,5.4vw,62px);}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero p.lede{color:var(--muted);font-size:18px;margin:20px 0 28px;max-width:52ch;}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;}
.hero-stats{display:flex;gap:30px;margin-top:34px;flex-wrap:wrap;}
.hero-stats .n{font-family:var(--f-display);font-size:26px;font-weight:700;}
.hero-stats .l{font-family:var(--f-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);}
.hero-visual{aspect-ratio:1/1;border-radius:var(--r-lg);border:1px solid var(--line-strong);background:
  linear-gradient(160deg,var(--surface),#0c0c0c);position:relative;overflow:hidden;box-shadow:var(--shadow);display:grid;place-items:center;}
.hero-visual .board{position:absolute;inset:0;background-image:
  linear-gradient(rgba(200,245,66,.09) 1px,transparent 1px),
  linear-gradient(90deg,rgba(200,245,66,.09) 1px,transparent 1px);background-size:34px 34px;mask-image:radial-gradient(circle at 50% 45%,#000 55%,transparent 80%);}
.hero-visual .chip{position:relative;width:46%;aspect-ratio:1;border-radius:18px;background:linear-gradient(135deg,#1c1c1c,#0a0a0a);border:1px solid var(--line-strong);box-shadow:inset 0 0 60px rgba(200,245,66,.18),var(--shadow-accent);display:grid;place-items:center;}
.hero-visual .chip::after{content:"RSBL";font-family:var(--f-mono);font-weight:700;letter-spacing:.14em;color:var(--accent-2);font-size:22px;}
.hero-visual .chip .pins{position:absolute;inset:-1px;border-radius:18px;background:
  repeating-linear-gradient(90deg,transparent 0 10px,rgba(200,245,66,.5) 10px 12px);-webkit-mask:linear-gradient(#000,#000) content-box,linear-gradient(#000,#000);-webkit-mask-composite:xor;mask-composite:exclude;padding:6px;opacity:.5;}
@media(max-width:860px){.hero-in{grid-template-columns:1fr;gap:30px;}.hero-visual{max-width:380px;}}

/* ---- Trust strip ---- */
.trust{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg-2);}
.trust-in{display:flex;gap:34px;flex-wrap:wrap;justify-content:space-between;padding-block:18px;}
.trust-in .item{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13.5px;font-weight:500;}
.trust-in .item svg{color:var(--accent-2);flex:none;}

/* ---- Category tiles ---- */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
@media(max-width:900px){.cat-grid{grid-template-columns:repeat(2,1fr);}}
.cat{position:relative;display:flex;flex-direction:column;gap:14px;padding:22px;border-radius:var(--r);background:var(--surface);
  border:1px solid var(--line);transition:transform .14s,border-color .15s,background .15s;overflow:hidden;}
.cat:hover{transform:translateY(-4px);border-color:var(--accent);background:var(--surface-2);}
.cat .ico{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,rgba(200,245,66,.18),rgba(200,245,66,.12));
  display:grid;place-items:center;color:var(--accent-2);border:1px solid var(--line);}
.cat h3{font-size:17px;}
.cat .count{font-family:var(--f-mono);font-size:12px;color:var(--faint);}
.cat .go{margin-top:auto;font-family:var(--f-mono);font-size:12px;color:var(--accent);letter-spacing:.04em;}

/* ---- Product grid + cards ---- */
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
@media(max-width:1000px){.prod-grid{grid-template-columns:repeat(3,1fr);}}
@media(max-width:720px){.prod-grid{grid-template-columns:repeat(2,1fr);}}
@media(max-width:460px){.prod-grid{grid-template-columns:1fr;}}
.pcard{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:transform .14s,border-color .15s,box-shadow .15s;}
.pcard:hover{transform:translateY(-4px);border-color:var(--line-strong);box-shadow:var(--shadow);}
.pcard .thumb{position:relative;aspect-ratio:4/3;background:linear-gradient(160deg,#151515,#0c0c0c);display:grid;place-items:center;}
.pcard .thumb img{width:100%;height:100%;object-fit:cover;}
.pcard .badges{position:absolute;top:10px;left:10px;display:flex;gap:6px;flex-wrap:wrap;}
.pcard .brand{position:absolute;top:10px;right:12px;font-family:var(--f-mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--faint);}
.pcard .body{padding:15px 16px 17px;display:flex;flex-direction:column;gap:7px;flex:1;}
.pcard .cat-label{font-family:var(--f-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-2);}
.pcard h3{font-size:15.5px;line-height:1.25;}
.pcard .spec{font-size:12.5px;color:var(--faint);}
.pcard .foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:10px;padding-top:12px;}
.pcard .price{font-family:var(--f-display);font-weight:700;font-size:20px;}
.pcard .price small{color:var(--faint);font-weight:500;font-size:12px;}

/* Placeholder thumbnail (until real API images) */
.ph{width:100%;height:100%;display:grid;place-items:center;position:relative;background:
  radial-gradient(400px 200px at 70% 0,rgba(200,245,66,.16),transparent 60%);}
.ph .mono{color:var(--faint);font-size:12px;letter-spacing:.12em;}
.ph .sil{font-size:46px;opacity:.5;}

/* ---- Product detail ---- */
.pdp{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;padding:40px 0 20px;}
@media(max-width:860px){.pdp{grid-template-columns:1fr;gap:26px;}}
.pdp .gallery{aspect-ratio:4/3;border-radius:var(--r-lg);border:1px solid var(--line);background:linear-gradient(160deg,#151515,#0c0c0c);overflow:hidden;}
.pdp .gallery img{width:100%;height:100%;object-fit:cover;}
.pdp h1{font-size:clamp(26px,3.2vw,38px);margin:10px 0 8px;}
.pdp .price-row{display:flex;align-items:baseline;gap:12px;margin:18px 0;}
.pdp .price-row .big{font-family:var(--f-display);font-weight:700;font-size:34px;}
.pdp .buy-row{display:flex;gap:12px;margin:22px 0;flex-wrap:wrap;}
.specs{width:100%;border-collapse:collapse;margin-top:10px;font-size:14px;}
.specs th,.specs td{text-align:left;padding:11px 0;border-bottom:1px solid var(--line);}
.specs th{color:var(--faint);font-weight:500;font-family:var(--f-mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;width:42%;}

.breadcrumb{font-family:var(--f-mono);font-size:12px;color:var(--faint);padding:18px 0;}
.breadcrumb a:hover{color:var(--accent);}

/* ---- Shop layout ---- */
.shop{display:grid;grid-template-columns:240px 1fr;gap:28px;padding:28px 0 40px;align-items:start;}
@media(max-width:860px){.shop{grid-template-columns:1fr;}}
.filters{position:sticky;top:90px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;}
.filters h4{font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin:16px 0 10px;}
.filters h4:first-child{margin-top:0;}
.filters a{display:block;padding:7px 0;color:var(--muted);font-size:14px;}
.filters a:hover,.filters a.active{color:var(--accent);}
.shop-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;flex-wrap:wrap;gap:12px;}
.shop-head h1{font-size:26px;}

/* ---- CTA band ---- */
.band{border-radius:var(--r-lg);padding:46px;background:
  radial-gradient(600px 300px at 100% 0,rgba(200,245,66,.18),transparent 60%),var(--surface);
  border:1px solid var(--line-strong);display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;}
.band h2{font-size:clamp(24px,3vw,34px);max-width:20ch;}
.band p{color:var(--muted);margin-top:8px;max-width:44ch;}

/* ---- Two ways to buy ---- */
.ways{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
@media(max-width:760px){.ways{grid-template-columns:1fr;}}
.way{display:flex;flex-direction:column;gap:12px;padding:28px;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--surface);}
.way-feature{border-color:var(--line-strong);background:
  radial-gradient(500px 240px at 100% 0,rgba(200,245,66,.14),transparent 60%),var(--surface);}
.way-tag{font-family:var(--f-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);}
.way h3{font-size:22px;}
.way-price{font-family:var(--f-display);color:var(--accent);margin-left:6px;}
.way p{color:var(--muted);font-size:14.5px;}
.way ul{list-style:none;display:grid;gap:6px;margin:2px 0 6px;padding:0;}
.way li{color:var(--muted);font-size:14px;padding-left:20px;position:relative;}
.way li::before{content:"";position:absolute;left:2px;top:.55em;width:8px;height:8px;border-radius:2px;background:var(--accent);}
.way .btn{margin-top:auto;align-self:flex-start;}

/* ---- Footer ---- */
.site-footer{background:var(--bg-2);border-top:1px solid var(--line);margin-top:30px;}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding:56px 0 28px;}
@media(max-width:820px){.foot-grid{grid-template-columns:1fr 1fr;}}
.site-footer h4{font-family:var(--f-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--faint);margin-bottom:14px;}
.site-footer a{display:block;color:var(--muted);font-size:14px;padding:5px 0;}
.site-footer a:hover{color:var(--text);}
.foot-desc{color:var(--muted);font-size:14px;max-width:34ch;margin:14px 0 18px;}
.foot-bottom{border-top:1px solid var(--line);padding:18px 0 40px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--faint);font-size:12.5px;}

/* Utilities */
.stack-sm{display:flex;flex-direction:column;gap:6px;}
.hidden{display:none!important;}
.center{text-align:center;}
.spinner{width:18px;height:18px;border:2px solid var(--line-strong);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite;display:inline-block;}
@keyframes spin{to{transform:rotate(360deg);}}