/* ═══ NADIR — design tokens ═══ */
:root {
  --bg: #030608;
  --ink: #dce8ec;
  --dim: #8aa0a8;
  --faint: #56666e;
  --accent: #59d8e6;
  --accent-dim: rgba(89, 216, 230, 0.35);
  --warn: #ffb454;
  --line: rgba(150, 190, 200, 0.14);
  --panel-bg: rgba(4, 10, 14, 0.72);
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: #03181c; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: #03181c; padding: 10px 18px;
  font-family: var(--font-mono); font-size: 13px; text-decoration: none;
}
.skip-link:focus { left: 0; }

/* ═══ Scene canvas ═══ */
#scene {
  position: fixed; inset: 0; width: 100%; height: 100%;
  z-index: 0; display: block;
}
.ocean-fallback {
  position: fixed; inset: 0; z-index: -1;
  background: linear-gradient(180deg, #0a3d52, #041826 40%, #010609);
}
body.no-webgl #scene { display: none; }
body.no-webgl .ocean-fallback { z-index: 0; }

/* ═══ HUD top bar ═══ */
.hud-top {
  position: fixed; top: 0; left: 0; right: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px;
  background: linear-gradient(180deg, rgba(3, 6, 8, 0.85), rgba(3, 6, 8, 0));
  pointer-events: none;
}
.hud-top > * { pointer-events: auto; }
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--ink); text-decoration: none;
  font-family: var(--font-mono); font-weight: 700; font-size: 17px;
  letter-spacing: 0.22em;
}
.brand svg { color: var(--accent); }
.hud-top nav { display: flex; align-items: center; gap: 26px; }
.hud-top nav a {
  color: var(--dim); text-decoration: none;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.hud-top nav a:hover, .hud-top nav a:focus-visible { color: var(--accent); }
.nav-cta {
  border: 1px solid var(--accent-dim); padding: 7px 16px;
  color: var(--accent) !important;
}
.nav-cta:hover { background: rgba(89, 216, 230, 0.1); }

/* ═══ Depth rail ═══ */
.depth-rail {
  position: fixed; right: 26px; top: 50%; transform: translateY(-50%);
  z-index: 30; display: flex; flex-direction: column; align-items: center; gap: 14px;
  font-family: var(--font-mono);
}
.depth-readout { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.depth-label { font-size: 9px; letter-spacing: 0.3em; color: var(--faint); }
.depth-value { font-size: 22px; font-weight: 700; color: var(--accent); font-variant-numeric: tabular-nums; }
.depth-unit { font-size: 10px; letter-spacing: 0.2em; color: var(--dim); }
.depth-track {
  width: 2px; height: 240px; background: var(--line); position: relative;
}
.depth-fill {
  position: absolute; top: 0; left: 0; width: 100%; height: 0%;
  background: linear-gradient(180deg, var(--accent), #1a5a68);
}
.zone-label {
  writing-mode: vertical-rl; font-size: 10px; letter-spacing: 0.32em;
  color: var(--dim); text-transform: uppercase;
}

/* ═══ Panels ═══ */
main { position: relative; z-index: 10; }
.panel {
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 120px 7vw;
  position: relative;
}
.panel-inner { max-width: 620px; }
.panel-right { justify-content: flex-end; }
.panel-wide .panel-inner { max-width: 1080px; }
.panel-final { min-height: 100vh; }

.eyebrow {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.22em;
  color: var(--accent); margin-bottom: 26px;
  display: flex; align-items: center; gap: 12px;
}
.tick { width: 26px; height: 1px; background: var(--accent); flex: none; }

h1, h2 {
  font-weight: 700; letter-spacing: -0.02em; line-height: 1.06;
  margin-bottom: 24px; text-wrap: balance;
}
h1 { font-size: clamp(2.6rem, 6vw, 4.6rem); }
h2 { font-size: clamp(2rem, 4.4vw, 3.4rem); }

.lede { color: var(--dim); font-size: clamp(1rem, 1.4vw, 1.15rem); max-width: 54ch; margin-bottom: 34px; }
.lede em { color: var(--ink); font-style: normal; font-weight: 500; }

/* reveal */
.panel-inner > * { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.panel.in-view .panel-inner > * { opacity: 1; transform: none; }
.panel.in-view .panel-inner > *:nth-child(2) { transition-delay: 0.08s; }
.panel.in-view .panel-inner > *:nth-child(3) { transition-delay: 0.16s; }
.panel.in-view .panel-inner > *:nth-child(4) { transition-delay: 0.24s; }
.panel.in-view .panel-inner > *:nth-child(5) { transition-delay: 0.32s; }
@media (prefers-reduced-motion: reduce) {
  .panel-inner > * { opacity: 1; transform: none; transition: none; }
}

/* ═══ Buttons ═══ */
.cta-row { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 44px; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 13px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase; text-decoration: none;
  padding: 15px 28px; transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.btn-primary {
  background: var(--accent); color: #03181c;
  border: 1px solid var(--accent);
}
.btn-primary:hover, .btn-primary:focus-visible { background: #8ce8f2; border-color: #8ce8f2; }
.btn-ghost {
  color: var(--ink); border: 1px solid var(--line);
}
.btn-ghost:hover, .btn-ghost:focus-visible { border-color: var(--accent-dim); color: var(--accent); }
.btn-arrow { font-family: var(--font-display); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ═══ Stat strip ═══ */
.stat-strip {
  display: flex; flex-wrap: wrap; gap: 0;
  border-top: 1px solid var(--line);
}
.stat-strip > div { padding: 18px 34px 0 0; margin-right: 34px; }
.stat-strip dt {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--faint); margin-bottom: 4px;
}
.stat-strip dd { font-size: 1.45rem; font-weight: 700; font-variant-numeric: tabular-nums; }

/* ═══ Spec lists ═══ */
.spec-list { list-style: none; border-top: 1px solid var(--line); }
.spec-list li {
  display: flex; justify-content: space-between; gap: 24px;
  padding: 14px 0; border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 13px;
}
.spec-key { color: var(--accent); letter-spacing: 0.14em; flex: none; }
.spec-val { color: var(--dim); text-align: right; }

/* ═══ Console ═══ */
.console {
  display: grid; grid-template-columns: 340px 1fr; gap: 18px;
  background: var(--panel-bg);
  border: 1px solid var(--line);
  padding: 18px;
  backdrop-filter: blur(6px);
}
.console-col { display: flex; flex-direction: column; gap: 18px; }
.console-block {
  border: 1px solid var(--line); padding: 18px;
  background: rgba(3, 8, 11, 0.55);
}
.console-head {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.28em;
  color: var(--faint); margin-bottom: 16px; font-weight: 500;
  display: flex; justify-content: space-between; align-items: baseline;
}
.ctrl-btn {
  display: flex; align-items: center; gap: 12px; width: 100%;
  background: none; border: 1px solid var(--line); color: var(--ink);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em;
  padding: 13px 16px; cursor: pointer; margin-bottom: 10px;
  transition: border-color 0.2s, background 0.2s;
}
.ctrl-btn:hover, .ctrl-btn:focus-visible { border-color: var(--accent-dim); }
.ctrl-btn:last-child { margin-bottom: 0; }
.ctrl-led {
  width: 8px; height: 8px; border-radius: 50%;
  background: #3a4a50; flex: none;
  transition: background 0.2s, box-shadow 0.2s;
}
.ctrl-btn[aria-pressed="true"] .ctrl-led {
  background: var(--warn); box-shadow: 0 0 10px var(--warn);
}
.ctrl-btn.pinging .led-cyan {
  background: var(--accent); box-shadow: 0 0 10px var(--accent);
}
.ctrl-state { margin-left: auto; color: var(--faint); font-size: 11px; }
.ctrl-btn[aria-pressed="true"] .ctrl-state { color: var(--warn); }

.planner-label {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.18em;
  color: var(--dim); margin-bottom: 12px;
}
.planner-label output { color: var(--accent); font-size: 14px; font-weight: 700; font-variant-numeric: tabular-nums; }

input[type="range"] {
  width: 100%; appearance: none; -webkit-appearance: none;
  height: 2px; background: var(--line); outline-offset: 6px;
  margin: 8px 0 18px; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none; -webkit-appearance: none;
  width: 16px; height: 16px; background: var(--accent);
  border: 2px solid #03181c; border-radius: 50%;
  box-shadow: 0 0 0 1px var(--accent);
}
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px; background: var(--accent);
  border: 2px solid #03181c; border-radius: 50%;
  box-shadow: 0 0 0 1px var(--accent);
}

.planner-out { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 18px; }
.planner-out dt {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--faint); margin-bottom: 2px;
}
.planner-out dd { font-family: var(--font-mono); font-size: 15px; font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }

.sonar-block { flex: 1; }
.sonar-status { color: var(--faint); letter-spacing: 0.18em; }
.sonar-status.active { color: var(--accent); }
#sonarCanvas { width: 100%; height: auto; display: block; background: #020507; border: 1px solid rgba(89, 216, 230, 0.08); }

.telemetry {
  display: flex; flex-wrap: wrap; gap: 10px 28px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--faint);
}
.telemetry b { color: var(--accent); font-weight: 500; margin-left: 8px; font-variant-numeric: tabular-nums; }

/* ═══ Reserve ═══ */
.reserve-card {
  border: 1px solid var(--line); background: var(--panel-bg);
  backdrop-filter: blur(6px);
  margin-bottom: 36px;
}
.reserve-row {
  display: flex; justify-content: space-between; gap: 24px;
  padding: 16px 22px; border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
}
.reserve-row:last-child { border-bottom: none; }
.reserve-row span { color: var(--dim); font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; align-self: center; }
.reserve-row b { text-align: right; font-weight: 500; }
.warn-text { color: var(--warn); }

/* ═══ Footer ═══ */
.site-footer {
  position: relative; z-index: 10;
  padding: 40px 7vw 48px; border-top: 1px solid var(--line);
  background: rgba(2, 4, 6, 0.9);
  font-size: 0.9rem;
}
.site-footer a { color: var(--accent); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.footer-dim { color: var(--faint); margin-top: 6px; font-size: 0.82rem; }

/* ═══ Scroll hint ═══ */
.scroll-hint {
  position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%);
  width: 22px; height: 36px; border: 1px solid var(--line); border-radius: 12px;
}
.scroll-hint span {
  position: absolute; top: 7px; left: 50%; margin-left: -1.5px;
  width: 3px; height: 7px; border-radius: 2px; background: var(--accent);
  animation: scrollNudge 2.2s ease-in-out infinite;
}
@keyframes scrollNudge {
  0%, 100% { transform: translateY(0); opacity: 1; }
  55% { transform: translateY(12px); opacity: 0.2; }
}
@media (prefers-reduced-motion: reduce) {
  .scroll-hint span { animation: none; }
}

/* ═══ Responsive ═══ */
@media (max-width: 980px) {
  .console { grid-template-columns: 1fr; }
  .panel-right { justify-content: flex-start; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .hud-top { padding: 14px 18px; }
  .hud-top nav a:not(.nav-cta) { display: none; }
  .depth-rail { right: 12px; gap: 10px; }
  .depth-track { height: 120px; }
  .zone-label { display: none; }
  .depth-value { font-size: 16px; }
  .panel { padding: 100px 6vw; }
  .panel-inner { max-width: 100%; padding-right: 44px; }
  .stat-strip > div { padding-right: 0; margin-right: 26px; }
  .stat-strip dd { font-size: 1.15rem; }
  .spec-list li { flex-direction: column; gap: 4px; }
  .spec-val { text-align: left; }
  .reserve-row { flex-direction: column; gap: 4px; }
  .reserve-row b { text-align: left; }
  .btn { padding: 13px 20px; font-size: 12px; }
}