/* GTO Groove — site styles (brand tokens, dark theme) */
:root{
  --bg:#12191F; --surface:#1A222B; --surface-2:#222E3A; --border:#2C3A48;
  --text:#F7FAFB; --muted:#A7B4BD; --slate-400:#7C8B96;
  --cyan:#22C7DD; --cyan-600:#15A6BC; --gold:#E0B23C; --on-accent:#0E2A30;
  --r-md:10px; --r-lg:16px; --r-xl:24px; --pill:9999px;
  --maxw:1120px; --read:720px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:'Poppins',system-ui,-apple-system,sans-serif;line-height:1.6;
  -webkit-font-smoothing:antialiased;}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--cyan-600)}
img,svg{max-width:100%}
.tabnum{font-family:'JetBrains Mono',ui-monospace,monospace;font-variant-numeric:tabular-nums}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
h1,h2,h3{line-height:1.15;font-weight:700;margin:0 0 .5em}
h1{font-size:clamp(2rem,5vw,3.25rem)}
h2{font-size:clamp(1.4rem,3vw,2rem);margin-top:1.6em}
h3{font-size:1.2rem;margin-top:1.4em}
p{margin:0 0 1.1em}
.muted{color:var(--muted)}

/* nav */
header.nav{position:sticky;top:0;z-index:50;background:rgba(18,25,31,.82);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--text)}
.brand img{height:30px;display:block}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{color:var(--muted);font-weight:500;font-size:.95rem}
.nav-links a:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;gap:8px;border:0;cursor:pointer;
  font-family:inherit;font-weight:600;border-radius:var(--r-md);
  padding:11px 20px;font-size:.95rem;transition:.15s}
.btn-primary{background:var(--cyan);color:#06222A;font-weight:700;
  box-shadow:0 2px 16px rgba(34,199,221,.40)}
.btn-primary:hover{background:#33D6EC;color:#06222A;box-shadow:0 4px 22px rgba(34,199,221,.55)}
.btn-ghost{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-ghost:hover{background:var(--surface-2)}
.btn-lg{padding:15px 28px;font-size:1.05rem}
@media(max-width:760px){.nav-links a:not(.btn){display:none}}

/* hero */
.hero{position:relative;overflow:hidden;
  background:radial-gradient(1200px 600px at 70% -10%,rgba(34,199,221,.10),transparent 60%),
             linear-gradient(180deg,#10171F,#1B2531)}
.hero-in{padding:88px 0 76px;max-width:860px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--gold);
  font-weight:600;font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px}
.hero h1 .ac{color:var(--cyan)}
.hero p.lead{font-size:1.2rem;color:var(--muted);max-width:620px;margin:18px 0 28px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.cta-note{color:var(--slate-400);font-size:.9rem}
.hero-spade{position:absolute;right:-60px;bottom:-80px;width:420px;opacity:.06;color:var(--cyan)}

/* sections */
section{padding:64px 0}
.section-head{max-width:680px;margin-bottom:36px}
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:860px){.grid-3,.grid-2{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:26px}
.card .ico{width:40px;height:40px;color:var(--cyan);margin-bottom:14px}
.card h3{margin-top:0}
.card p{margin-bottom:0;color:var(--muted)}
.pill-tag{display:inline-block;background:var(--surface-2);color:var(--muted);
  border-radius:var(--pill);padding:4px 12px;font-size:.8rem;font-weight:500;margin-bottom:14px}

/* feature band */
.band{background:var(--surface)}
.kpis{display:flex;gap:40px;flex-wrap:wrap}
.kpi b{display:block;font-size:2rem;color:var(--gold);font-family:'JetBrains Mono',monospace}
.kpi span{color:var(--muted);font-size:.9rem}

/* learn list */
.article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
@media(max-width:760px){.article-list{grid-template-columns:1fr}}
.article-card{display:block;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r-lg);padding:22px;color:var(--text);transition:.15s}
.article-card:hover{border-color:var(--cyan);transform:translateY(-2px)}
.article-card .pill-tag{margin-bottom:10px}
.article-card h3{margin:0 0 6px;color:var(--text)}
.article-card p{margin:0;color:var(--muted);font-size:.95rem}

/* article page */
.article{max-width:var(--read);margin:0 auto;padding:48px 24px 24px}
.breadcrumb{font-size:.85rem;color:var(--slate-400);margin-bottom:18px}
.breadcrumb a{color:var(--muted)}
.article .meta{color:var(--slate-400);font-size:.9rem;margin-bottom:28px}
.article h2{color:var(--text)}
.article ul,.article ol{margin:0 0 1.1em;padding-left:1.3em}
.article li{margin-bottom:.4em}
.callout{background:var(--surface);border:1px solid var(--border);
  border-left:4px solid var(--gold);border-radius:var(--r-md);padding:18px 22px;margin:24px 0}
.callout.cyan{border-left-color:var(--cyan)}
.callout h4{margin:0 0 8px;font-size:1rem}
.example{background:var(--surface-2);border-radius:var(--r-md);padding:18px 22px;margin:24px 0;
  border:1px solid var(--border)}
.example .lbl{color:var(--cyan);font-weight:600;font-size:.8rem;letter-spacing:.06em;text-transform:uppercase}
.cta-box{background:linear-gradient(120deg,#15212B,#22323F);border:1px solid var(--border);
  border-radius:var(--r-lg);padding:32px;margin:40px 0 8px;text-align:center}
.cta-box h3{margin-top:0}
.related{border-top:1px solid var(--border);margin-top:40px;padding-top:28px}
.related h4{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;font-size:.8rem}
.related a{display:block;padding:6px 0}

/* footer */
footer.site{background:#0E141A;border-top:1px solid var(--border);padding:48px 0;margin-top:40px}
.foot-in{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
.foot-in .brand img{height:26px}
.foot-cols{display:flex;gap:56px;flex-wrap:wrap}
.foot-cols h5{color:var(--muted);font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;margin:0 0 12px}
.foot-cols a{display:block;color:var(--slate-400);padding:4px 0;font-size:.92rem}
.foot-cols a:hover{color:var(--text)}
.copyright{color:var(--slate-400);font-size:.85rem;margin-top:28px}
.disclaimer{color:#5B6660;font-size:.78rem;margin-top:8px;max-width:640px}