:root {
  --bg: #020617;
  --bg-2: #07111f;
  --panel: rgba(15, 23, 42, 0.78);
  --panel-2: rgba(255, 255, 255, 0.055);
  --line: rgba(226, 232, 240, 0.13);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --muted-2: #94a3b8;
  --cyan: #22d3ee;
  --blue: #60a5fa;
  --green: #4ade80;
  --yellow: #fef08a;
  --red: #fb7185;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.38);
  --radius: 28px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, rgba(34, 211, 238, .16), transparent 34rem),
              radial-gradient(circle at 82% 12%, rgba(74, 222, 128, .10), transparent 24rem),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
}

img, svg { max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }

.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.skip-link {
  position: absolute; left: -999px; top: 12px; padding: 10px 14px; border-radius: 999px;
  background: var(--cyan); color: #031424; font-weight: 800; z-index: 99;
}
.skip-link:focus { left: 12px; }

.site-header {
  position: sticky; top: 0; z-index: 40; backdrop-filter: blur(18px);
  background: rgba(2, 6, 23, 0.72); border-bottom: 1px solid var(--line);
}
.nav {
  min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 22px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 900; letter-spacing: .04em; }
.brand img { width: 44px; height: 44px; }
.brand small { display: block; color: var(--muted-2); font-weight: 700; font-size: 11px; letter-spacing: .15em; text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 22px; color: var(--muted); font-size: 14px; font-weight: 700; }
.nav-links a:hover { color: var(--text); }
.menu-button { display: none; border: 1px solid var(--line); background: var(--panel-2); color: var(--text); border-radius: 14px; padding: 10px 12px; }

.hero {
  position: relative; overflow: hidden; padding: 82px 0 68px;
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .6;
  background: linear-gradient(140deg, rgba(34, 211, 238, .13), transparent 38%, rgba(74, 222, 128, .09));
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.02fr .98fr; gap: 48px; align-items: center; }
.eyebrow {
  display: inline-flex; gap: 8px; align-items: center; border: 1px solid rgba(34, 211, 238, .25);
  background: rgba(34, 211, 238, .09); color: #cffafe; padding: 10px 14px; border-radius: 999px;
  font-weight: 800; font-size: 13px; letter-spacing: .05em;
}
.pulse { width: 9px; height: 9px; border-radius: 999px; background: var(--green); box-shadow: 0 0 0 6px rgba(74, 222, 128, .13); }
h1 { font-size: clamp(46px, 6vw, 82px); line-height: .96; letter-spacing: -0.06em; margin: 24px 0 22px; }
.lede { font-size: clamp(18px, 2vw, 22px); color: var(--muted); max-width: 690px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; border-radius: 18px; padding: 15px 20px;
  font-weight: 900; border: 1px solid transparent; transition: transform .2s ease, background .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--cyan); color: #031424; box-shadow: 0 22px 60px rgba(34, 211, 238, .2); }
.btn-ghost { border-color: var(--line); background: var(--panel-2); color: var(--text); }

.card {
  border: 1px solid var(--line); background: var(--panel); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
}
.hero-card { padding: 18px; }
.map-card img { border-radius: 22px; display: block; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; padding: 12px 4px 2px; }
.stat { background: rgba(255,255,255,.05); border: 1px solid var(--line); border-radius: 20px; padding: 16px; }
.stat strong { display: block; font-size: 28px; line-height: 1; }
.stat span { display: block; color: var(--muted-2); font-size: 12px; margin-top: 8px; }

.section { padding: 86px 0; }
.section.alt { background: rgba(255,255,255,.025); border-block: 1px solid var(--line); }
.section-head { max-width: 760px; margin-bottom: 34px; }
.section-head.center { margin-inline: auto; text-align: center; }
.kicker { color: var(--cyan); font-weight: 950; letter-spacing: .18em; text-transform: uppercase; font-size: 13px; }
h2 { font-size: clamp(34px, 4vw, 54px); line-height: 1.02; letter-spacing: -0.045em; margin: 12px 0 16px; }
h3 { margin: 0; font-size: 24px; line-height: 1.15; letter-spacing: -0.02em; }
p { margin: 0; }
.muted { color: var(--muted); }
.small { font-size: 13px; color: var(--muted-2); }

.route-layout { display: grid; grid-template-columns: .42fr .58fr; gap: 38px; align-items: start; }
.timeline { display: grid; gap: 13px; }
.segment {
  border: 1px solid var(--line); background: var(--panel-2); border-radius: 24px; padding: 18px; cursor: pointer;
  display: grid; grid-template-columns: 56px 1fr auto; gap: 16px; align-items: start;
}
.segment:hover, .segment.is-active { border-color: rgba(34, 211, 238, .45); background: rgba(34, 211, 238, .08); }
.num { width: 50px; height: 50px; display: grid; place-items: center; border-radius: 18px; background: rgba(34, 211, 238, .12); color: #cffafe; font-weight: 950; }
.badge { border-radius: 999px; background: rgba(255,255,255,.08); border: 1px solid var(--line); color: var(--muted); padding: 7px 10px; font-size: 12px; font-weight: 900; white-space: nowrap; }

.system-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.system-card { padding: 26px; }
.tag { display: inline-flex; margin-bottom: 16px; border: 1px solid rgba(34,211,238,.22); background: rgba(34,211,238,.08); color: #cffafe; padding: 7px 10px; border-radius: 999px; font-size: 12px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.visual-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 24px; }
.visual-card { padding: 16px; }
.visual-card img { border-radius: 22px; display: block; }

.safety-layout { display: grid; grid-template-columns: .42fr .58fr; gap: 38px; }
.checklist { display: grid; gap: 14px; }
.check { display: flex; gap: 14px; padding: 18px; border: 1px solid var(--line); background: var(--panel-2); border-radius: 22px; }
.check::before { content: ""; flex: 0 0 18px; width: 18px; height: 18px; border-radius: 999px; margin-top: 5px; background: rgba(34,211,238,.18); border: 1px solid rgba(34,211,238,.55); box-shadow: inset 0 0 0 5px rgba(34,211,238,.08); }

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.metric { text-align: center; padding: 24px; border: 1px solid var(--line); border-radius: 26px; background: rgba(15, 23, 42, .78); }
.metric strong { display: block; font-size: 42px; color: #cffafe; line-height: 1; }
.metric span { display: block; margin-top: 10px; color: var(--muted-2); font-size: 12px; font-weight: 900; text-transform: uppercase; letter-spacing: .12em; }

.tabs { display: grid; grid-template-columns: 300px 1fr; gap: 22px; }
.tab-list { display: grid; gap: 10px; align-content: start; }
.tab-button { text-align: left; border: 1px solid var(--line); background: var(--panel-2); color: var(--muted); border-radius: 18px; padding: 16px; font-weight: 900; cursor: pointer; }
.tab-button[aria-selected="true"] { color: var(--text); border-color: rgba(74,222,128,.45); background: rgba(74,222,128,.09); }
.tab-panel { border: 1px solid var(--line); background: var(--panel); border-radius: 26px; padding: 28px; min-height: 300px; box-shadow: var(--shadow); }
.tab-panel[hidden] { display: none; }

.cta { border: 1px solid rgba(34,211,238,.25); background: linear-gradient(145deg, rgba(34,211,238,.14), rgba(74,222,128,.08)); border-radius: 36px; padding: 36px; }
.cta-grid { display: grid; grid-template-columns: .52fr .48fr; gap: 32px; align-items: start; }
.question-list { margin: 0; padding-left: 22px; color: var(--muted); }
.question-list li { margin: 12px 0; }
.copy-box { margin-top: 18px; border: 1px solid var(--line); background: rgba(2,6,23,.55); border-radius: 22px; padding: 18px; }
.copy-box textarea { width: 100%; min-height: 152px; resize: vertical; border: 1px solid var(--line); background: rgba(2,6,23,.88); color: var(--muted); border-radius: 16px; padding: 14px; }
.copy-row { display: flex; gap: 12px; align-items: center; margin-top: 12px; }
.copy-status { color: var(--green); font-size: 13px; font-weight: 800; }

.site-footer { border-top: 1px solid var(--line); padding: 34px 0; color: var(--muted-2); }
.footer-grid { display: flex; justify-content: space-between; gap: 22px; align-items: flex-start; }
.footer-grid img { width: 42px; height: 42px; }

@media (max-width: 950px) {
  .hero-grid, .route-layout, .safety-layout, .cta-grid, .tabs, .visual-grid { grid-template-columns: 1fr; }
  .system-grid { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .container { width: min(100% - 26px, var(--max)); }
  .nav-links { display: none; position: absolute; left: 13px; right: 13px; top: 78px; padding: 16px; flex-direction: column; align-items: stretch; border: 1px solid var(--line); background: rgba(2,6,23,.96); border-radius: 22px; }
  .nav-links.open { display: flex; }
  .menu-button { display: inline-flex; }
  .hero { padding-top: 54px; }
  .stats, .metrics { grid-template-columns: 1fr; }
  .segment { grid-template-columns: 46px 1fr; }
  .segment .badge { grid-column: 2; justify-self: start; }
  .footer-grid { flex-direction: column; }
  h1 { font-size: clamp(42px, 14vw, 64px); }
}