:root {
  --bg: #10161a;
  --bg-2: #172129;
  --panel: #1c2832;
  --line: #31424e;
  --text: #f4f7f8;
  --muted: #b7c4cc;
  --cyan: #3ee0ff;
  --magenta: #ff4fa3;
  --lime: #d6ff4a;
  --amber: #ffb020;
  --ink: #10161a;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(900px 420px at 0% -10%, rgba(255,79,163,.22), transparent 55%),
    radial-gradient(800px 380px at 100% 0%, rgba(62,224,255,.16), transparent 50%),
    var(--bg);
  color: var(--text);
  font-family: Inter, "Avenir Next", "Segoe UI", sans-serif;
  line-height: 1.6;
}
a { color: var(--cyan); }
a:hover { color: var(--lime); }
img { max-width: 100%; height: auto; }
.skip {
  position: absolute; left: 12px; top: -40px; background: var(--lime); color: var(--ink);
  padding: 8px 12px; z-index: 5;
}
.skip:focus { top: 12px; }
.wrap { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 4;
  background: rgba(16,22,26,.92); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; }
.brand img { width: 36px; height: 36px; }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-button {
  display: none; border: 1px solid var(--line); padding: 10px 14px; min-height: 44px;
  color: var(--text); cursor: pointer;
}
.nav-links { display: flex; gap: 16px; align-items: center; }
.nav-links a { color: var(--text); text-decoration: none; font-weight: 600; }
.nav-links a[aria-current="page"] { color: var(--lime); }
.play {
  background: var(--lime); color: var(--ink); text-decoration: none; font-weight: 800;
  padding: 10px 14px; min-height: 44px; display: inline-flex; align-items: center;
}
main { padding: 28px 0 64px; }
.hero {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 28px; align-items: center;
  padding: 12px 0 8px;
}
.kicker { color: var(--cyan); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; font-size: .82rem; }
h1 { font-size: clamp(2rem, 4vw, 3.3rem); line-height: 1.05; margin: 8px 0 12px; }
.lede { font-size: 1.12rem; color: var(--text); }
.meta-line { color: var(--muted); font-size: .95rem; }
.panel {
  background: linear-gradient(180deg, rgba(62,224,255,.06), transparent 40%), var(--panel);
  border: 1px solid var(--line); padding: 18px; margin: 18px 0;
}
.panel h2 { margin-top: 0; }
figure { margin: 0; }
figcaption { color: var(--muted); font-size: .9rem; margin-top: 8px; }
.steps { padding-left: 1.2rem; }
.steps li { margin: 8px 0; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--cyan); font-size: .88rem; }
.table-scroll { overflow-x: auto; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.card { display: block; background: var(--bg-2); border: 1px solid var(--line); padding: 14px; color: var(--text); text-decoration: none; min-height: 100%; }
.card strong { display: block; color: var(--lime); margin-bottom: 6px; }
.note { border-left: 4px solid var(--amber); padding-left: 12px; color: var(--muted); }
.call { border-left: 4px solid var(--lime); padding-left: 12px; }
label { display: block; font-weight: 700; margin-bottom: 8px; }
input[type="number"] {
  width: min(240px, 100%); font: inherit; padding: 12px; min-height: 44px;
  background: var(--bg); color: var(--text); border: 1px solid var(--line);
}
button {
  font: inherit; font-weight: 800; background: var(--cyan); color: var(--ink);
  border: 0; padding: 12px 16px; min-height: 44px; cursor: pointer; margin-top: 8px;
}
#result { font-size: 1.05rem; }
.site-footer { border-top: 1px solid var(--line); padding: 28px 0 48px; color: var(--muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px 16px; }
.footer-links a { color: var(--muted); }
@media (max-width: 860px) {
  .hero, .cards { grid-template-columns: 1fr; }
  .nav-button { display: inline-flex; align-items: center; }
  .nav-links {
    display: none; position: absolute; left: 0; right: 0; top: 72px;
    background: #10161a; border-bottom: 1px solid var(--line);
    padding: 8px 16px 16px; flex-direction: column; align-items: flex-start;
  }
  .nav-toggle:checked ~ .nav-links { display: flex; }
  .nav-links a, .play { width: 100%; }
}