:root{
  --sand-50:#faf8f3;
  --sand-100:#f2ede3;
  --sand-200:#e6ddcd;
  --stone:#cbbda9;
  --stone-mid:#a79e91;
  --stone-dark:#887869;
  --ink:#1d1a16;
  --ink-2:#443d34;
  --muted:#7c7264;
  --terra:#b4602f;
  --terra-soft:#e8d3bd;
  --charcoal:#2f2c28;
  --line:rgba(29,26,22,.12);
  --line-2:rgba(29,26,22,.06);
  --radius:18px;
  --shadow:0 1px 2px rgba(29,26,22,.04),0 12px 32px -18px rgba(29,26,22,.25);
  --mono:'JetBrains Mono',ui-monospace,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--sand-50);color:var(--ink);
  font-family:'IBM Plex Sans Arabic',system-ui,-apple-system,sans-serif;
  font-weight:400;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{font-weight:600;line-height:1.25;margin:0;letter-spacing:-.01em}
p{margin:0}
a{color:inherit;text-decoration:none}
ul{margin:0;padding-inline-start:1.1em}
li{margin:.35em 0}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(250,248,243,.82);
  backdrop-filter:blur(14px) saturate(1.2);border-bottom:1px solid var(--line-2)}
.nav-in{max-width:1180px;margin:0 auto;padding:14px 28px;
  display:flex;align-items:center;gap:28px;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;font-size:14.5px;letter-spacing:.01em}
.brand b{font-weight:600}
.mark{width:14px;height:14px;border-radius:3px;
  background:linear-gradient(135deg,var(--stone-mid),var(--terra));flex:none}
.nav-links{display:flex;gap:22px;font-size:13.5px;color:var(--ink-2)}
.nav-links a{padding-bottom:2px;border-bottom:1px solid transparent;transition:.25s}
.nav-links a:hover{color:var(--terra);border-bottom-color:var(--terra)}
.nav-tag{font-family:var(--mono);font-size:11px;color:var(--muted);letter-spacing:.04em}

/* layout */
main{max-width:1180px;margin:0 auto;padding:0 28px}
.block{padding:64px 0;border-top:1px solid var(--line-2)}
.block-head{max-width:720px;margin-bottom:32px}
.block-head h2{font-size:clamp(21px,2.6vw,29px);margin-bottom:10px}
.block-head p{color:var(--ink-2);font-size:15.5px}
.kicker{display:inline-block;font-family:var(--mono);font-size:11px;
  letter-spacing:.12em;color:var(--terra);border:1px solid var(--terra-soft);
  background:#fff;border-radius:100px;padding:4px 12px;margin-bottom:20px}

/* hero */
.hero{padding:70px 0 56px}
.hero-grid{display:grid;grid-template-columns:1.55fr .95fr;gap:56px;align-items:start}
h1{font-size:clamp(30px,4.4vw,50px);font-weight:700;letter-spacing:-.025em}
h1 em{font-style:normal;color:var(--terra)}
.lede{margin-top:20px;font-size:16.5px;color:var(--ink-2);max-width:46ch}
.meta{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-top:32px}
.meta div{background:var(--sand-50);padding:14px 16px}
.meta span{display:block;font-size:11.5px;color:var(--muted);margin-bottom:4px}
.meta b{font-family:var(--mono);font-size:16px;font-weight:600}
.hero-note{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 28px;box-shadow:var(--shadow)}
.hero-note h3{font-size:15px;margin-bottom:14px;color:var(--terra);
  text-transform:none;letter-spacing:0}
.hero-note ul{padding-inline-start:1.05em;font-size:14px;color:var(--ink-2)}
.hero-note li{padding-inline-start:2px}

/* board / drawing */
.board{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 22px 16px;box-shadow:var(--shadow);overflow:hidden}
.board-in{background:linear-gradient(180deg,#fdfcf9,#f7f3ea);
  border-radius:12px;border:1px solid var(--line-2);padding:8px}
.board svg{display:block;width:100%;height:auto}
.legend{display:flex;flex-wrap:wrap;gap:18px;padding:16px 6px 4px;
  font-size:12.5px;color:var(--ink-2)}
.legend span{display:inline-flex;align-items:center;gap:7px}
.sw{width:13px;height:13px;border-radius:3px;display:inline-block;
  border:1px solid rgba(29,26,22,.14)}
.sw-stone{background:var(--stone)}
.sw-cop{background:#d9cbb6}
.sw-steel{background:#3b3833}
.sw-wood{background:#8a5f3c}
.sw-led{background:#f2c98a}
.fineprint{margin-top:16px;font-size:13px;color:var(--muted);max-width:80ch}

/* swatches */
.swatches{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px}
.sw-card{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;
  transition:transform .3s ease,box-shadow .3s ease}
.sw-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.sw-chip{height:104px}
.sw-body{padding:14px 16px 16px}
.sw-body b{display:block;font-size:14px}
.sw-body span{font-family:var(--mono);font-size:11.5px;color:var(--muted)}
.sw-body p{font-size:12.5px;color:var(--ink-2);margin-top:8px;line-height:1.6}

/* tabs + option panel */
.tabs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px}
.tab{cursor:pointer;font-family:inherit;font-size:14px;color:var(--ink-2);
  background:#fff;border:1px solid var(--line);border-radius:100px;
  padding:9px 20px;transition:.25s}
.tab:hover{border-color:var(--stone-mid);transform:translateY(-1px)}
.tab[aria-selected="true"]{background:var(--ink);color:var(--sand-50);border-color:var(--ink)}
.option-panel{display:grid;grid-template-columns:1.15fr 1fr;gap:0;
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:#fff;box-shadow:var(--shadow);animation:fadeUp .45s ease both}
.opt-fig{background:linear-gradient(180deg,#fdfcf9,#f4efe5);padding:20px;
  border-inline-end:1px solid var(--line-2)}
.opt-fig svg{display:block;width:100%;height:auto}
.opt-body{padding:28px 30px}
.opt-body h3{font-size:20px;margin-bottom:6px}
.opt-body .tag{font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  color:var(--terra);display:block;margin-bottom:12px}
.opt-body p{font-size:14.5px;color:var(--ink-2)}
.opt-list{list-style:none;padding:0;margin:18px 0 0;font-size:13.5px}
.opt-list li{display:flex;justify-content:space-between;gap:12px;
  padding:9px 0;border-top:1px solid var(--line-2);color:var(--ink-2)}
.opt-list li b{font-weight:500;color:var(--ink)}
.opt-list li span{font-family:var(--mono);font-size:12px;color:var(--muted);white-space:nowrap}

/* table */
.table-wrap{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;font-size:14px}
thead th{background:var(--sand-100);text-align:start;padding:13px 18px;
  font-weight:600;font-size:12.5px;color:var(--ink-2);letter-spacing:.02em}
tbody td{padding:13px 18px;border-top:1px solid var(--line-2);color:var(--ink-2);
  vertical-align:top}
tbody td:first-child{color:var(--ink);font-weight:500;width:26%}
tbody td:last-child{color:var(--muted);font-size:13px}
tbody tr:hover{background:rgba(203,189,169,.12)}

/* cost */
.cost{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.cost-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;
  transition:transform .3s ease,box-shadow .3s ease}
.cost-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.cost-card small{font-family:var(--mono);font-size:11px;color:var(--muted);
  letter-spacing:.06em;display:block;margin-bottom:8px}
.cost-card b{font-family:var(--mono);font-size:20px;display:block;font-weight:600}
.cost-card p{font-size:12.5px;color:var(--ink-2);margin-top:8px;line-height:1.6}
.cost-note{margin-top:18px;font-size:12.5px;color:var(--muted)}

/* next + footer */
.next-in{background:var(--ink);color:var(--sand-100);border-radius:22px;
  padding:38px 40px;display:grid;gap:12px}
.next-in h2{font-size:clamp(19px,2.4vw,25px);color:#fff}
.next-in p{font-size:15px;color:rgba(250,248,243,.78);max-width:70ch}
.next-in .dim{font-family:var(--mono);font-size:12px;color:var(--terra-soft);
  letter-spacing:.02em;margin-top:6px}
footer{border-top:1px solid var(--line-2);margin-top:40px}
.foot-in{max-width:1180px;margin:0 auto;padding:26px 28px;display:flex;
  justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:12.5px;color:var(--muted);font-family:var(--mono)}

@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .option-panel{grid-template-columns:1fr}
  .opt-fig{border-inline-end:none;border-bottom:1px solid var(--line-2)}
  .nav-links{display:none}
}
@media(max-width:620px){
  main{padding:0 18px}
  .nav-in{padding:12px 18px}
  .meta{grid-template-columns:repeat(2,1fr)}
  .block{padding:46px 0}
  .hero{padding:44px 0 36px}
  .next-in{padding:26px 22px;border-radius:16px}
  .opt-body{padding:22px}
  tbody td:first-child{width:auto}
  table{font-size:13px}
  thead th,tbody td{padding:11px 12px}
}