:root{--bg:#04080f;--ground:#0b1a22;--panel:#10242e;--rim:#1e4653;--ink:#f0fbfa;--dim:#9fc3c7;--accent:#4fd6c9;--accent-ink:#04201d}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 "Segoe UI",system-ui,-apple-system,sans-serif}
body{background:radial-gradient(1200px 600px at 20% -10%,#123a45 0%,var(--bg) 60%)}
.wrap{max-width:960px;margin:0 auto;padding:40px 22px 60px}
.top{display:flex;align-items:center;gap:16px;margin-bottom:28px}
.mark{width:44px;height:44px;border-radius:10px;border:1px solid var(--rim);background:var(--panel);padding:6px;box-shadow:0 0 18px rgba(79,214,201,.25)}
.eyebrow{font:600 12px/1 "Consolas","JetBrains Mono",monospace;letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}
h1{margin:4px 0 0;font-size:30px;line-height:1.15;font-weight:700}
h2{margin:0 0 10px;font-size:15px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.hero{background:linear-gradient(180deg,rgba(16,36,46,.9),rgba(11,26,34,.9));border:1px solid var(--rim);border-radius:14px;padding:28px 26px}
.lede{margin:0 0 20px;font-size:19px;color:var(--ink)}
.cta{margin:0 0 12px}
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);font-weight:700;font-size:18px;padding:14px 26px;border-radius:10px;text-decoration:none;box-shadow:0 6px 24px rgba(79,214,201,.35)}
.btn:hover,.btn:focus{filter:brightness(1.08);outline:2px solid var(--ink);outline-offset:2px}
.meta{margin:0;color:var(--dim);font-family:"Consolas","JetBrains Mono",monospace;font-size:14px}
.meta b{color:var(--ink)}
.note{margin:12px 0 0;color:#ffd166;font-size:14px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin-top:16px}
.card{background:rgba(16,36,46,.7);border:1px solid var(--rim);border-radius:12px;padding:18px 20px}
.card ol,.card ul{margin:0;padding-left:20px}
.card li{margin:6px 0}
.keys{list-style:none;padding:0}
kbd{display:inline-block;min-width:34px;text-align:center;font:600 13px/1.2 "Consolas","JetBrains Mono",monospace;color:var(--accent);background:var(--ground);border:1px solid var(--rim);border-bottom-width:2px;border-radius:6px;padding:4px 7px;margin-right:6px}
.small{color:var(--dim);font-size:13px;margin:10px 0 0}
.foot{display:flex;gap:18px;flex-wrap:wrap;justify-content:space-between;margin-top:26px;color:var(--dim);font-size:13px}
.foot a{color:var(--accent)}
@media (max-width:520px){.wrap{padding:24px 14px 40px}h1{font-size:24px}.hero{padding:20px 16px}.btn{width:100%;text-align:center}}