*{margin:0;padding:0;box-sizing:border-box}
:root,[data-theme="dark"]{
  --bg:#08080a;--bg2:#0d0d10;--surface:#111116;--surface2:#19191f;
  --glass:rgba(255,255,255,.035);--glass-border:rgba(255,255,255,.06);--glass-hover:rgba(255,255,255,.06);
  --bd:#1c1c22;--bd2:#28282f;
  --t:#eeeef2;--t2:#9a9aa6;--t3:#5a5a66;
  --accent:#4f8ff7;--accent-dim:rgba(79,143,247,.08);
  --green:#3dd68c;--purple:#b18cfa;--yellow:#f5c542;
  --hero-glow:radial-gradient(ellipse at 50% 20%,rgba(79,143,247,.07) 0%,transparent 55%);
  --card-shadow:0 2px 40px rgba(0,0,0,.35);
}
[data-theme="light"]{
  --bg:#f5f5f8;--bg2:#ebebf0;--surface:#fff;--surface2:#f0f0f5;
  --glass:rgba(255,255,255,.6);--glass-border:rgba(0,0,0,.06);--glass-hover:rgba(255,255,255,.75);
  --bd:#dcdce2;--bd2:#ccccd3;
  --t:#0a0f1a;--t2:#2d3748;--t3:#64748b;
  --accent:#2563eb;--accent-dim:rgba(37,99,235,.06);
  --green:#16a34a;--purple:#7c3aed;--yellow:#ca8a04;
  --hero-glow:radial-gradient(ellipse at 50% 20%,rgba(37,99,235,.05) 0%,transparent 55%);
  --card-shadow:0 2px 30px rgba(0,0,0,.05);
}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--t);font-family:'Inter',system-ui,sans-serif;-webkit-font-smoothing:antialiased;transition:background .3s,color .3s}
a{color:var(--t2);text-decoration:none;transition:color .15s}
a:hover{color:var(--t)}
code{font-family:'JetBrains Mono',monospace;font-size:.85em}

/* NAV */
header{position:fixed;top:0;left:0;right:0;z-index:50;padding:0 clamp(1.5rem,5vw,4rem);height:3.75rem;display:flex;align-items:center;justify-content:space-between;background:var(--glass);backdrop-filter:blur(20px) saturate(180%);border-bottom:1px solid var(--glass-border);transition:background .3s}
.mark{font-weight:800;font-size:1.05rem;color:var(--t);letter-spacing:-.02em;display:flex;align-items:center;gap:.5rem}
.mark svg{opacity:.6}
.links{display:flex;align-items:center;gap:1.5rem;font-size:.84rem;font-weight:500}
.theme-btn{background:none;border:1px solid var(--bd);border-radius:6px;padding:.32rem .55rem;cursor:pointer;color:var(--t2);display:flex;align-items:center;transition:all .15s}
.theme-btn:hover{border-color:var(--bd2);color:var(--t)}

/* HERO */
.hero{min-height:100vh;display:flex;flex-direction:column;justify-content:center;padding:6rem clamp(1.5rem,5vw,4rem) 4rem;position:relative;max-width:76rem;margin:0 auto}
.hero::before{content:'';position:absolute;inset:0;background:var(--hero-glow);pointer-events:none;transition:background .3s}
.hero-inner{position:relative;max-width:56rem}
.hero-badge{display:inline-flex;align-items:center;gap:.5rem;padding:.35rem .9rem;font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);background:var(--accent-dim);border:1px solid rgba(79,143,247,.12);border-radius:100px;margin-bottom:2.5rem}
.hero h1{font-size:clamp(3.2rem,6vw,5.2rem);font-weight:800;letter-spacing:-0.045em;line-height:1;margin-bottom:2rem}
.hero h1 em{font-style:normal;color:var(--t3)}
.hero-sub{font-size:1.2rem;line-height:1.85;color:var(--t2);max-width:38rem;margin-bottom:3rem}
.hero-cta{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}
.btn-fill{display:inline-flex;align-items:center;gap:.4rem;padding:.65rem 1.3rem;font-size:.88rem;font-weight:600;border-radius:8px;background:var(--accent);color:#fff;transition:opacity .15s}
.btn-fill:hover{opacity:.88;color:#fff}
.btn-outline{display:inline-flex;align-items:center;gap:.4rem;padding:.65rem 1.3rem;font-size:.88rem;font-weight:500;border-radius:8px;color:var(--t2);border:1px solid var(--bd);transition:all .15s}
.btn-outline:hover{color:var(--t);border-color:var(--bd2)}

/* STATS */
.stats{display:flex;gap:1rem;margin-top:4rem;flex-wrap:wrap}
.stat{background:var(--glass);backdrop-filter:blur(16px);border:1px solid var(--glass-border);border-radius:14px;padding:1.4rem 1.8rem;min-width:140px;transition:all .2s;box-shadow:var(--card-shadow)}
.stat:hover{background:var(--glass-hover);transform:translateY(-1px)}
.stat .num{font-size:1.7rem;font-weight:800;letter-spacing:-.03em;margin-bottom:.25rem}
.stat .lbl{font-size:.7rem;color:var(--t3);font-weight:500;text-transform:uppercase;letter-spacing:.07em}

/* SECTION COMMON */
.sec{padding:8rem clamp(1.5rem,5vw,4rem);max-width:76rem;margin:0 auto;border-top:1px solid var(--bd);transition:border .3s}
.sec-narrow{max-width:56rem;margin:0 auto}
.sec h2{font-size:clamp(2rem,4vw,3.2rem);font-weight:800;letter-spacing:-.04em;line-height:1.1;margin-bottom:1.5rem}
.sec h2 em{font-style:normal;color:var(--t3)}
.sec-sub{font-size:1.12rem;line-height:1.8;color:var(--t2);max-width:38rem;margin-bottom:3rem}

/* TERMINAL */
.tw{margin:3rem 0}
.tm{background:var(--surface);border:1px solid var(--bd);border-radius:14px;overflow:hidden;box-shadow:var(--card-shadow);transition:background .3s,border .3s}
.tm-bar{display:flex;align-items:center;gap:.5rem;padding:.7rem 1rem;border-bottom:1px solid var(--bd);transition:border .3s}
.tm-bar i{display:block;width:10px;height:10px;border-radius:50%}
.tm-bar i:nth-child(1){background:#ff5f57}
.tm-bar i:nth-child(2){background:#febc2e}
.tm-bar i:nth-child(3){background:#28c840}
.tm-bar span{flex:1;text-align:center;font-family:'JetBrains Mono',monospace;font-size:.7rem;color:var(--t3)}
.tm pre{padding:1.5rem 1.75rem;font-family:'JetBrains Mono',monospace;font-size:.82rem;line-height:2;color:var(--t2);overflow-x:auto;white-space:pre-wrap}
.tm .g{color:var(--green)}.tm .y{color:var(--yellow)}.tm .c{color:#67e8f9}.tm .p{color:var(--purple)}.tm .d{color:var(--t3)}

/* SPLIT LAYOUT */
.split{display:grid;grid-template-columns:1fr 1fr;gap:3.5rem;align-items:start;margin:3rem 0}
.st h3{font-size:1.2rem;font-weight:700;margin-bottom:.6rem;letter-spacing:-.01em}
.st p{font-size:.9rem;color:var(--t2);line-height:1.7;margin-bottom:1.5rem}
.sc{background:var(--surface);border:1px solid var(--bd);border-radius:14px;padding:1.75rem;box-shadow:var(--card-shadow);transition:background .3s,border .3s}
.sc pre{font-family:'JetBrains Mono',monospace;font-size:.82rem;line-height:1.8;color:var(--t2)}
.sc .fl{font-size:.7rem;color:var(--t3);margin-bottom:.75rem;font-family:'JetBrains Mono',monospace}

/* FEATURE GRID */
.fg{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--bd);border:1px solid var(--bd);border-radius:14px;overflow:hidden;margin:3rem 0;transition:background .3s}
.fg .fc{background:var(--bg);padding:2rem 1.75rem;transition:background .3s}
.fg h3{font-size:1.05rem;font-weight:700;margin-bottom:.5rem;letter-spacing:-.01em}
.fg p{font-size:.9rem;color:var(--t3);line-height:1.7}

/* TWO-COL FEATURES */
.feat-2{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin:3rem 0}
.feat-card{background:var(--surface);border:1px solid var(--bd);border-radius:14px;padding:2rem;box-shadow:var(--card-shadow);transition:background .3s,border .3s}
.feat-card h3{font-size:1.1rem;font-weight:700;margin-bottom:.5rem}
.feat-card p{font-size:.92rem;color:var(--t2);line-height:1.7}

/* INVARIANTS */
.inv-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:.75rem 2rem;margin:2rem 0}
.inv-list li{font-size:.95rem;color:var(--t2);line-height:1.6;padding-left:1.4rem;position:relative}
.inv-list li::before{content:'';position:absolute;left:0;top:.55em;width:8px;height:8px;border-radius:50%;background:var(--green)}

/* CTA */
.cta{text-align:center;padding:7rem 2rem;border-top:1px solid var(--bd);transition:border .3s}
.cta h2{font-size:clamp(2rem,4vw,3.2rem);font-weight:800;letter-spacing:-.04em;line-height:1.1;margin-bottom:1rem}
.cta p{color:var(--t2);margin:0 auto 2.5rem;max-width:32rem;font-size:1.12rem;line-height:1.7}
.cta .hero-cta{justify-content:center}

/* FOOTER */
footer{padding:2.5rem clamp(1.5rem,5vw,4rem);border-top:1px solid var(--glass-border);display:flex;align-items:center;justify-content:space-between;max-width:76rem;margin:0 auto;font-size:.8rem;color:var(--t3);transition:border .3s}
footer .fk{display:flex;gap:1.5rem}

@media(max-width:768px){
  .split{grid-template-columns:1fr;gap:2rem}
  .fg{grid-template-columns:1fr}
  .feat-2{grid-template-columns:1fr}
  .inv-list{grid-template-columns:1fr}
  .stats{gap:.6rem}
  .stat{min-width:auto;flex:1;padding:1rem 1.2rem}
  .links a:not(:last-child):not(.theme-btn){display:none}
}