:root {
  --bg: #0b0e14;
  --bg2: #11151f;
  --card: #161b27;
  --border: #232a3a;
  --fg: #e6e9f0;
  --muted: #8b94a7;
  --accent: #5b8cff;
  --accent2: #8a5bff;
  --ok: #34d399;
  --warn: #fbbf24;
  --err: #f87171;
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: radial-gradient(1200px 600px at 70% -10%, #1a2236 0%, var(--bg) 55%);
  color: var(--fg);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, sans-serif;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 22px; }

/* nav */
nav {
  display: flex; align-items: center; gap: 18px;
  padding: 18px 22px; max-width: 980px; margin: 0 auto;
}
nav .brand { font-weight: 700; font-size: 18px; letter-spacing: .2px; display: flex; align-items: center; gap: 9px; }
nav .brand .dot { width: 11px; height: 11px; border-radius: 50%; background: linear-gradient(135deg, var(--accent), var(--accent2)); box-shadow: 0 0 14px var(--accent); }
nav .spacer { flex: 1; }
nav a { color: var(--muted); font-weight: 500; }
nav a:hover { color: var(--fg); text-decoration: none; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; border: 0; border-radius: 10px; padding: 10px 16px;
  font-weight: 600; font-size: 14px; transition: transform .08s, filter .15s;
}
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: transparent; border: 1px solid var(--border); color: var(--fg); }
.btn.sm { padding: 6px 11px; font-size: 13px; border-radius: 8px; }
.btn.danger { background: transparent; border: 1px solid var(--err); color: var(--err); }

/* hero */
.hero { text-align: center; padding: 56px 0 30px; }
.hero h1 { font-size: 44px; line-height: 1.1; margin: 0 0 14px; letter-spacing: -.5px; }
.hero h1 .grad { background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--muted); font-size: 18px; max-width: 620px; margin: 0 auto 26px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* cards / sections */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 32px 0; }
.feature h3 { margin: 4px 0 6px; font-size: 16px; }
.feature p { color: var(--muted); margin: 0; font-size: 14px; }
.feature .ico { font-size: 22px; }
@media (max-width: 720px) { .grid3 { grid-template-columns: 1fr; } .hero h1 { font-size: 34px; } }

/* playground */
.pg { margin: 30px 0; }
.pg .row { display: flex; gap: 10px; }
.pg input[type=text] {
  flex: 1; background: var(--bg2); border: 1px solid var(--border); color: var(--fg);
  border-radius: 10px; padding: 12px 14px; font-size: 15px; outline: none;
}
.pg input[type=text]:focus { border-color: var(--accent); }
.results { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.result { background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.result a { font-weight: 600; }
.result .u { color: var(--ok); font-size: 12px; word-break: break-all; }
.result .c { color: var(--muted); font-size: 14px; margin-top: 4px; }
.hint { color: var(--muted); font-size: 13px; margin-top: 8px; }
.err { color: var(--err); font-size: 14px; }

/* tables / keys */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
code, pre { font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; }
code { background: var(--bg2); border: 1px solid var(--border); padding: 1.5px 6px; border-radius: 6px; font-size: 13px; }
pre { background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; overflow-x: auto; font-size: 13px; line-height: 1.5; }
.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge.ok { background: rgba(52,211,153,.14); color: var(--ok); }
.kpi { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin: 4px 0 22px; }
.kpi .card { text-align: center; }
.kpi .n { font-size: 28px; font-weight: 700; }
.kpi .l { color: var(--muted); font-size: 13px; }
.section-title { margin: 30px 0 12px; font-size: 20px; }
hr.sep { border: 0; border-top: 1px solid var(--border); margin: 34px 0; }
footer { color: var(--muted); text-align: center; padding: 40px 0; font-size: 13px; }
.notice { background: rgba(91,140,255,.08); border: 1px solid rgba(91,140,255,.3); border-radius: 10px; padding: 12px 14px; font-size: 14px; }
.keybox { background: var(--bg2); border: 1px dashed var(--accent); border-radius: 10px; padding: 12px 14px; word-break: break-all; font-family: "SF Mono", ui-monospace, monospace; font-size: 13px; }