/* ============================================
   CoreBit — shared site stylesheet (v2, premium)
   ============================================ */

:root{
  --bg:#000000;
  --bg-alt:#0A0A0C;
  --panel:rgba(255,255,255,.04);
  --panel-solid:#111114;
  --panel-edge:rgba(255,255,255,.09);
  --accent:#3FE0C5;
  --accent-soft:#8FF3E2;
  --accent-dim:rgba(63,224,197,.12);
  --text:#F5F5F7;
  --muted:#A1A1A6;
  --maxw:1200px;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0; background:var(--bg); color:var(--text);
  font-family:'Inter', sans-serif;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:'Chakra Petch', sans-serif; font-weight:600;
  letter-spacing:-.5px; margin:0 0 .5em;
}
p{ margin:0 0 1em; color:var(--text); }
a{ color:var(--accent); text-decoration:none; }
a:hover{ text-decoration:underline; }
code, pre, .mono{ font-family:'JetBrains Mono', monospace; }

.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 32px; }

/* ---------- nav ---------- */
header.site-nav{
  position:sticky; top:0; z-index:50;
  background:rgba(0,0,0,.7); backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--panel-edge);
}
.nav-inner{
  max-width:var(--maxw); margin:0 auto; padding:18px 32px;
  display:flex; align-items:center; justify-content:space-between;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand .mark{
  width:30px; height:30px; border-radius:8px;
  display:flex; align-items:center; justify-content:center;
  font-family:'Chakra Petch',sans-serif; font-weight:700; font-size:14px;
  color:#000; background:var(--accent);
}
.brand .word{
  font-family:'Chakra Petch',sans-serif; font-weight:600; font-size:18px; letter-spacing:-.3px;
  color:var(--text);
}
.brand .word span{ color:var(--accent); }

nav.links{ display:flex; align-items:center; gap:36px; }
nav.links a{
  color:var(--muted); font-size:14px; font-weight:500;
  font-family:'Inter',sans-serif;
}
nav.links a:hover{ color:var(--text); text-decoration:none; }
nav.links a.active{ color:var(--text); }
.nav-cta{
  background:var(--accent); color:#000 !important;
  padding:9px 20px; border-radius:100px;
  font-family:'Inter',sans-serif; font-size:13px; font-weight:600;
}
.nav-cta:hover{ opacity:.85; text-decoration:none; }

/* ---------- hero (big, apple-style) ---------- */
.hero{
  position:relative; padding:160px 0 120px; overflow:hidden;
  text-align:center;
}
.hero .glow{
  position:absolute; top:-200px; left:50%; transform:translateX(-50%);
  width:1000px; height:600px; border-radius:50%;
  background:radial-gradient(ellipse at center, rgba(63,224,197,.16) 0%, transparent 70%);
  pointer-events:none;
}
.hero .wrap{ position:relative; }
.kicker{
  font-family:'Inter',sans-serif; font-weight:600; font-size:14px; letter-spacing:.5px;
  color:var(--accent); margin-bottom:20px;
}
.hero h1{
  font-size:88px; line-height:1.02; letter-spacing:-2px;
  margin:0 auto 24px; max-width:900px;
  background:linear-gradient(180deg, #fff 30%, #a8a8ad 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero p.lead{
  font-size:22px; color:var(--muted); max-width:600px; margin:0 auto 40px;
  font-family:'Inter',sans-serif; font-weight:400;
}
.btn-row{ display:flex; gap:16px; flex-wrap:wrap; justify-content:center; }
.btn{
  display:inline-block; padding:15px 32px; border-radius:100px;
  font-family:'Inter',sans-serif; font-size:16px; font-weight:600;
}
.btn.primary{ background:var(--accent); color:#000; }
.btn.primary:hover{ text-decoration:none; opacity:.85; transform:translateY(-1px); }
.btn.ghost{ color:var(--text); background:rgba(255,255,255,.08); border:1px solid var(--panel-edge); }
.btn.ghost:hover{ background:rgba(255,255,255,.14); text-decoration:none; }

/* smaller hero variant for subpages */
.hero.compact{ padding:110px 0 70px; }
.hero.compact h1{ font-size:56px; }
.hero.compact p.lead{ font-size:19px; }

/* ---------- sections ---------- */
section{ padding:110px 0; }
section.alt{ background:var(--bg-alt); border-top:1px solid var(--panel-edge); border-bottom:1px solid var(--panel-edge); }
.section-head{ margin-bottom:56px; text-align:center; }
.section-head .kicker{ margin-bottom:10px; }
.section-head h2{ font-size:44px; letter-spacing:-1px; }
.section-head p{ color:var(--muted); max-width:560px; margin:0 auto; font-size:18px; }

/* ---------- cards ---------- */
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.grid-2{ display:grid; grid-template-columns:repeat(2,1fr); gap:20px; }
@media(max-width:900px){
  .grid-3{grid-template-columns:1fr;} .grid-2{grid-template-columns:1fr;}
  .hero h1{ font-size:52px; } .hero.compact h1{ font-size:38px; }
  .section-head h2{ font-size:32px; }
}

.card{
  position:relative;
  background:var(--panel-solid); border:1px solid var(--panel-edge);
  border-radius:20px; padding:36px;
  transition:transform .25s ease, border-color .25s ease, background .25s ease;
}
.card:hover{
  transform:translateY(-4px);
  border-color:rgba(63,224,197,.4);
  background:#15161A;
}
.card .tag{
  font-family:'Inter',sans-serif; font-size:13px; font-weight:600;
  color:var(--accent); margin-bottom:14px; display:block;
}
.card h3{ font-size:22px; margin-bottom:12px; letter-spacing:-.3px; }
.card p{ color:var(--muted); font-size:15px; margin-bottom:20px; }
.card a.card-link{ font-family:'Inter',sans-serif; font-size:14px; font-weight:600; }

/* ---------- spec table ---------- */
.spec-table{ width:100%; border-collapse:collapse; }
.spec-table tr{ border-bottom:1px solid var(--panel-edge); }
.spec-table tr:last-child{ border-bottom:none; }
.spec-table td{ padding:18px 0; }
.spec-table td.k{
  font-family:'Inter',sans-serif; font-weight:500; font-size:14px;
  color:var(--muted); width:220px; vertical-align:top;
}
.spec-table td.v{ font-size:17px; font-weight:500; }

/* ---------- product/feature panel (apple-esque big showcase) ---------- */
.showcase{
  background:linear-gradient(180deg,#111114 0%, #0A0A0C 100%);
  border:1px solid var(--panel-edge); border-radius:28px;
  padding:64px; text-align:center; margin-bottom:24px;
}
.showcase h2{ font-size:40px; letter-spacing:-1px; }
.showcase p{ color:var(--muted); font-size:18px; max-width:520px; margin:0 auto 28px; }
.showcase .stat-row{ display:flex; gap:48px; justify-content:center; flex-wrap:wrap; margin-top:36px; }
.stat{ text-align:center; }
.stat .num{
  font-family:'Chakra Petch',sans-serif; font-weight:700; font-size:34px; color:var(--accent);
}
.stat .lbl{ font-size:13px; color:var(--muted); margin-top:4px; }

/* ---------- tutorial article ---------- */
.article-header{ padding:100px 0 50px; text-align:center; position:relative; overflow:hidden; }
.article-header h1{
  font-size:48px; max-width:760px; margin:0 auto 18px; letter-spacing:-1px;
  background:linear-gradient(180deg, #fff 30%, #a8a8ad 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.meta{
  display:flex; gap:18px; align-items:center; justify-content:center; margin-top:18px;
  font-family:'Inter',sans-serif; font-size:13px; color:var(--muted);
}
.meta .dot{ width:4px; height:4px; border-radius:50%; background:var(--muted); }

.article-body{ max-width:720px; margin:0 auto; }
.article-body h2{ font-size:28px; margin-top:52px; letter-spacing:-.5px; }
.article-body h3{ font-size:20px; margin-top:32px; color:var(--accent); }
.article-body p, .article-body li{ color:#D6D9DE; font-size:17px; }
.article-body ul, .article-body ol{ padding-left:22px; }
.article-body li{ margin-bottom:10px; }

.callout{
  border-radius:16px; background:var(--panel); border:1px solid var(--panel-edge);
  padding:20px 24px; margin:28px 0; font-size:15px; color:var(--muted);
}
.callout b{ color:var(--text); }

.codeblock{
  background:#08090B; border:1px solid var(--panel-edge); border-radius:12px;
  padding:18px 22px; font-family:'JetBrains Mono',monospace; font-size:13px;
  color:var(--accent); overflow-x:auto; margin:22px 0;
}

/* ---------- footer ---------- */
footer{
  border-top:1px solid var(--panel-edge); padding:48px 0;
  display:flex; align-items:center; justify-content:space-between;
  flex-wrap:wrap; gap:16px;
}
footer .word{ font-family:'Inter',sans-serif; font-size:13px; color:var(--muted); }
footer .social{ display:flex; gap:24px; }
footer .social a{ font-family:'Inter',sans-serif; font-size:13px; color:var(--muted); font-weight:500; }
footer .social a:hover{ color:var(--accent); }