:root {
  --bg: #05080d;
  --bg2: #0a121c;
  --panel: #0e1826;
  --panel2: #12202f;
  --line: #1d3143;
  --ink: #dce8f2;
  --muted: #8aa2b7;
  --cyan: #35d0e0;
  --cyan-dim: #1c7f8c;
  --amber: #ffb454;
  --green: #57d98a;
  --red: #ff6b6b;
  --grid: rgba(53, 208, 224, 0.09);
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  --mono: "SFMono-Regular", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  background:
    radial-gradient(1200px 600px at 70% -10%, #0d2233 0%, transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 22px; }

/* ---- top nav ---- */
header.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(5, 8, 13, 0.78);
  border-bottom: 1px solid var(--line);
}
header.nav .wrap { display: flex; align-items: center; gap: 20px; height: 58px; }
.brand { font-family: var(--mono); font-weight: 700; letter-spacing: 1px; color: var(--ink); }
.brand span { color: var(--cyan); }
header.nav nav { margin-left: auto; display: flex; gap: 18px; flex-wrap: wrap; }
header.nav nav a { color: var(--muted); font-size: 13px; letter-spacing: .3px; }
header.nav nav a:hover { color: var(--cyan); text-decoration: none; }

/* ---- hero ---- */
.hero { padding: 74px 0 40px; position: relative; overflow: hidden; }
.hero .tag {
  font-family: var(--mono); color: var(--cyan); font-size: 12px; letter-spacing: 3px;
  text-transform: uppercase; margin-bottom: 14px;
}
.hero h1 { font-size: clamp(34px, 6vw, 62px); line-height: 1.03; margin: 0 0 18px; letter-spacing: -1px; }
.hero h1 em { color: var(--cyan); font-style: normal; }
.hero p.lede { font-size: 18px; color: var(--muted); max-width: 640px; margin: 0 0 26px; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 8px; font-weight: 600; font-size: 14px;
  border: 1px solid var(--cyan-dim); color: var(--cyan); background: rgba(53,208,224,0.06);
}
.btn:hover { background: rgba(53,208,224,0.14); text-decoration: none; }
.btn.solid { background: var(--cyan); color: #04141a; border-color: var(--cyan); }
.btn.solid:hover { background: #5ce0ee; }

.heroStats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 44px; }
.heroStats .s { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 16px; }
.heroStats .s b { display: block; font-family: var(--mono); font-size: 24px; color: var(--cyan); }
.heroStats .s span { font-size: 12px; color: var(--muted); }

/* ---- sections ---- */
section { padding: 54px 0; border-top: 1px solid var(--line); }
section h2 { font-size: clamp(24px, 3.4vw, 34px); margin: 0 0 6px; letter-spacing: -.5px; }
section h2 .n { font-family: var(--mono); color: var(--cyan-dim); font-size: 15px; margin-right: 12px; }
section .sub { color: var(--muted); max-width: 720px; margin: 0 0 28px; }
h3 { font-size: 18px; margin: 30px 0 10px; color: var(--ink); }
p { color: #c2d2e0; }

/* ---- panels & sims ---- */
.panel {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel2) 100%);
  border: 1px solid var(--line); border-radius: 14px; padding: 22px; box-shadow: var(--shadow);
}
.sim { display: grid; grid-template-columns: 320px 1fr; gap: 24px; align-items: start; }
.controls label { display: block; font-size: 13px; color: var(--muted); margin: 16px 0 6px; font-family: var(--mono); }
.controls .val { color: var(--cyan); float: right; }
input[type=range] { width: 100%; accent-color: var(--cyan); height: 4px; }
.readout { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 8px; }
.readout .r { background: var(--bg2); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; }
.readout .r b { display: block; font-family: var(--mono); font-size: 19px; color: var(--ink); }
.readout .r.ok b { color: var(--green); }
.readout .r.warn b { color: var(--amber); }
.readout .r.bad b { color: var(--red); }
.readout .r span { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
canvas { max-width: 100%; display: block; }
.canvasWrap { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 10px; }

/* ---- tables ---- */
.tbl { width: 100%; border-collapse: collapse; margin: 8px 0 4px; font-size: 14px; }
.tbl th, .tbl td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.tbl th { color: var(--cyan); font-family: var(--mono); font-size: 12px; letter-spacing: .5px; text-transform: uppercase; }
.tbl td { color: #c2d2e0; }
.tbl td.mono, .tbl td .mono { font-family: var(--mono); color: var(--ink); }
.tbl tr:hover td { background: rgba(53,208,224,0.03); }
.pill { display: inline-block; font-family: var(--mono); font-size: 11px; padding: 2px 8px; border-radius: 20px; }
.pill.good { color: var(--green); border: 1px solid rgba(87,217,138,.4); }
.pill.mid { color: var(--amber); border: 1px solid rgba(255,180,84,.4); }
.pill.no { color: var(--red); border: 1px solid rgba(255,107,107,.4); }

/* ---- build stepper ---- */
.steps { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.steps button {
  font-family: var(--mono); font-size: 12px; padding: 8px 12px; border-radius: 8px;
  background: var(--bg2); border: 1px solid var(--line); color: var(--muted); cursor: pointer;
}
.steps button.active { border-color: var(--cyan); color: var(--cyan); background: rgba(53,208,224,0.08); }
.stepDesc { color: var(--muted); font-size: 14px; min-height: 44px; margin-top: 12px; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.note { border-left: 3px solid var(--cyan-dim); padding: 6px 0 6px 16px; color: var(--muted); font-size: 14px; margin: 18px 0; }
.warnNote { border-left-color: var(--amber); }

footer { padding: 40px 0 60px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 12px; color: var(--muted); margin-top: 10px; }
.legend i { display: inline-block; width: 11px; height: 11px; border-radius: 3px; margin-right: 6px; vertical-align: middle; }

@media (max-width: 820px) {
  .sim { grid-template-columns: 1fr; }
  .heroStats { grid-template-columns: repeat(2, 1fr); }
  .grid2 { grid-template-columns: 1fr; }
  header.nav nav { display: none; }
}