:root {
  --ink: #0b192b;
  --ink-2: #102137;
  --panel: #132a43;
  --panel-2: #1b3552;
  --edge: #738ba7;
  --soft-edge: #3c5874;
  --text: #f0f3f8;
  --secondary: #bacad9;
  --muted: #8ca3bb;
  --cream: #f5dfc8;
  --orange: #d38b46;
  --orange-edge: #ffcc8e;
  --gold: #e8c471;
  --green: #84c5a0;
  --red: #da858a;
  --cyan: #85c5d7;
  --step: polygon(0 8px, 8px 8px, 8px 0, calc(100% - 8px) 0, calc(100% - 8px) 8px, 100% 8px, 100% calc(100% - 8px), calc(100% - 8px) calc(100% - 8px), calc(100% - 8px) 100%, 8px 100%, 8px calc(100% - 8px), 0 calc(100% - 8px));
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--ink);
  color: var(--text);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 300px;
  background:
    linear-gradient(rgba(115, 139, 167, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(115, 139, 167, .035) 1px, transparent 1px),
    radial-gradient(circle at 78% -10%, #1d4166 0, transparent 34rem),
    var(--ink);
  background-size: 24px 24px, 24px 24px, auto, auto;
}

button, input { font: inherit; }
a { color: inherit; }
img { display: block; max-width: 100%; }

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 50;
  padding: 12px 16px;
  background: var(--cream);
  color: var(--ink);
}
.skip-link:focus { top: 12px; }

.site-header {
  min-height: 82px;
  padding: 15px clamp(20px, 4vw, 64px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  border-bottom: 1px solid var(--soft-edge);
  background: rgba(11, 25, 43, .88);
}

.brand-lockup { display: flex; align-items: center; gap: 16px; }
.brand-mark { width: 44px; color: var(--orange-edge); }
.kicker, .section-index, .card-kicker, .peak-title p {
  margin: 0 0 6px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .14em;
}
.brand-lockup h1 { margin: 0; font-size: clamp(20px, 2.1vw, 30px); letter-spacing: -.02em; }

.header-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px; }
.header-links select { max-width: 190px; min-height: 44px; padding: 10px; font: inherit; font-size: 13px; color: var(--cream); background: var(--panel); border: 1px solid var(--soft-edge); }
.header-links select:focus-visible { outline: 3px solid var(--orange-edge); outline-offset: 3px; }
.header-links a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid var(--soft-edge);
  color: var(--secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 750;
}
.header-links a:hover { border-color: var(--edge); color: var(--text); background: var(--panel); }
.header-links a:focus-visible, button:focus-visible, input:focus-visible { outline: 3px solid var(--orange-edge); outline-offset: 3px; }
.header-links svg { width: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; }

main { width: min(1600px, 100%); margin: 0 auto; padding: clamp(24px, 3vw, 42px) clamp(16px, 4vw, 64px) 64px; }
.intro { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: clamp(24px, 4vw, 64px); align-items: end; margin-bottom: 28px; }
.intro h2 { max-width: 760px; margin: 0; color: var(--cream); font-size: clamp(28px, 2.6vw, 34px); line-height: 1.08; letter-spacing: -.035em; }
.intro-copy { max-width: 600px; margin: 0; color: var(--secondary); font-size: clamp(13px, 1.2vw, 16px); line-height: 1.5; }

.load-error { margin: 0 0 32px; padding: 18px 20px; border: 1px solid var(--red); background: rgba(218, 133, 138, .1); color: var(--text); }
.load-error strong, .load-error span { display: block; }
.load-error span { margin-top: 4px; color: var(--secondary); }

.peak-heading {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: end;
  gap: clamp(18px, 3vw, 42px);
  padding: 0 0 20px;
  border-bottom: 1px solid var(--edge);
}
.peak-number { display: flex; align-items: baseline; color: var(--orange-edge); font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.peak-number span { font-size: clamp(38px, 5vw, 64px); font-weight: 900; line-height: .8; }
.peak-number small { color: var(--muted); font-size: 14px; }
.peak-title h2 { margin: 0; font-size: clamp(32px, 4.2vw, 60px); line-height: .9; letter-spacing: -.045em; text-transform: uppercase; }
.game-target { text-align: right; }
.game-target span { display: block; margin-bottom: 7px; color: var(--muted); font: 800 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .15em; }
.game-target strong { color: var(--cream); font: 900 clamp(25px, 3vw, 44px)/1 ui-monospace, SFMono-Regular, Consolas, monospace; }

.compare { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 38px minmax(0, 1fr); margin: 18px 0 34px; }
.art-panel { min-width: 0; }
.art-panel > header { min-height: 72px; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 13px 15px; background: var(--panel); border: 1px solid var(--soft-edge); }
.art-panel h3 { margin: 3px 0 0; font-size: clamp(14px, 1.4vw, 19px); }
.panel-code { color: var(--orange-edge); font: 900 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .17em; }
.asset-state { flex: none; padding: 6px 8px; border: 1px solid currentColor; color: var(--green); font: 800 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .11em; }
.asset-state-reference { color: var(--cyan); }
.asset-state.is-missing { color: var(--red); }
.art-frame { position: relative; margin: 0; aspect-ratio: 579 / 1024; overflow: hidden; background: #091523; border: 1px solid var(--soft-edge); border-top: 0; }
.art-frame img { width: 100%; height: 100%; object-fit: cover; image-rendering: pixelated; }
.art-frame figcaption { position: absolute; left: 14px; bottom: 14px; z-index: 2; max-width: calc(100% - 28px); padding: 7px 10px; border: 1px solid rgba(240, 243, 248, .34); background: rgba(11, 25, 43, .86); color: var(--secondary); font: 700 10px/1.35 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .05em; }
.compare-divider { display: grid; place-items: center; }
.compare-divider::before, .compare-divider::after { content: ""; position: absolute; left: calc(50% - 1px); width: 1px; background: var(--soft-edge); }
.compare-divider::before { top: 72px; bottom: 0; }
.compare-divider span { position: relative; z-index: 2; width: 28px; height: 28px; background: var(--orange); border: 3px solid var(--orange-edge); transform: rotate(45deg); }
.asset-missing { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: 9px; padding: 28px; text-align: center; background: linear-gradient(145deg, #0c1d31, #132a43); color: var(--secondary); }
.asset-missing[hidden] { display: none; }
.asset-missing svg { width: 58px; fill: none; stroke: var(--edge); stroke-width: 2; }
.asset-missing strong { color: var(--text); }
.asset-missing span { max-width: 290px; line-height: 1.5; }

.controls-and-facts { display: grid; grid-template-columns: 1.12fr .88fr; gap: 20px; }
.altimeter-card, .geography-card { padding: clamp(22px, 3vw, 34px); background: var(--panel); border: 1px solid var(--soft-edge); clip-path: var(--step); }
.card-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; padding-bottom: 22px; }
.card-header h2 { margin: 0; color: var(--cream); font-size: clamp(24px, 2.5vw, 36px); }
.demo-label { padding: 7px 9px; border: 1px solid var(--gold); color: var(--gold); font: 800 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .1em; }
.altimeter-readout { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 22px; }
.altimeter-readout > div { padding: 16px; background: var(--ink-2); border: 1px solid var(--soft-edge); }
.altimeter-readout span { display: block; margin-bottom: 8px; color: var(--muted); font-size: 12px; }
.altimeter-readout output, .altimeter-readout strong { color: var(--cream); font: 900 clamp(23px, 3vw, 39px)/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.range-label { display: flex; justify-content: space-between; margin: 0 1px 9px; color: var(--muted); font: 700 11px/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.altitude-range { width: 100%; height: 30px; margin: 0; appearance: none; background: transparent; cursor: pointer; }
.altitude-range::-webkit-slider-runnable-track { height: 6px; background: var(--ink); border: 1px solid var(--edge); }
.altitude-range::-moz-range-track { height: 6px; background: var(--ink); border: 1px solid var(--edge); }
.altitude-range::-webkit-slider-thumb { width: 22px; height: 28px; margin-top: -12px; appearance: none; border: 3px solid var(--orange-edge); border-radius: 0; background: var(--orange); box-shadow: 0 0 0 3px var(--ink-2); }
.altitude-range::-moz-range-thumb { width: 18px; height: 24px; border: 3px solid var(--orange-edge); border-radius: 0; background: var(--orange); box-shadow: 0 0 0 3px var(--ink-2); }
.progress-row { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 14px; margin-top: 13px; }
.progress-track { height: 10px; padding: 2px; border: 1px solid var(--edge); background: var(--ink); }
.progress-track i { display: block; width: 0; height: 100%; background: repeating-linear-gradient(90deg, var(--orange-edge) 0 8px, var(--orange) 8px 12px); transition: width 120ms ease-out; }
.progress-row strong { min-width: 52px; color: var(--orange-edge); font: 900 18px/1 ui-monospace, SFMono-Regular, Consolas, monospace; text-align: right; }
.real-height { color: var(--cyan); font: 900 clamp(22px, 2.7vw, 38px)/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.silhouette-note { margin: 0; color: var(--text); font-size: 16px; line-height: 1.58; }
.real-note { min-height: 1.5em; margin: 12px 0 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.source-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.source-links a { padding: 7px 9px; border: 1px solid var(--soft-edge); color: var(--secondary); font-size: 11px; font-weight: 750; text-decoration: none; }
.source-links a:hover { border-color: var(--cyan); color: var(--text); }
.light-control { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 25px; padding-top: 18px; border-top: 1px solid var(--soft-edge); color: var(--muted); font: 800 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .1em; }
.light-control div { display: flex; }
.light-control button { min-height: 38px; padding: 8px 13px; border: 1px solid var(--edge); background: var(--ink-2); color: var(--secondary); cursor: pointer; }
.light-control button + button { margin-left: -1px; }
.light-control button.is-active { position: relative; border-color: var(--orange-edge); background: var(--orange); color: var(--ink); }

.peak-library { margin-top: 56px; padding-top: 26px; border-top: 1px solid var(--edge); }
.peak-library > header { display: flex; align-items: end; justify-content: space-between; gap: 32px; margin-bottom: 20px; }
.peak-library h2 { margin: 0; font-size: clamp(28px, 4vw, 48px); }
.peak-library > header > p { max-width: 460px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.5; }
.peak-strip { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(166px, 1fr); gap: 10px; overflow-x: auto; padding: 4px 4px 18px; scroll-snap-type: x proximity; scrollbar-color: var(--edge) var(--ink); }
.peak-button { position: relative; min-height: 236px; padding: 0; overflow: hidden; scroll-snap-align: start; border: 1px solid var(--soft-edge); background: var(--panel); color: var(--text); text-align: left; cursor: pointer; }
.peak-button:hover { border-color: var(--edge); transform: translateY(-2px); }
.peak-button[aria-current="true"] { border-color: var(--orange-edge); box-shadow: 0 0 0 2px var(--orange); }
.peak-thumb { display: block; position: relative; height: 154px; overflow: hidden; background: linear-gradient(145deg, #173452, #0b192b); }
.peak-thumb img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 25%; image-rendering: pixelated; }
.peak-thumb::after { content: ""; position: absolute; inset: auto 0 0; height: 45%; background: linear-gradient(transparent, rgba(11, 25, 43, .88)); }
.peak-thumb-empty { position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted); font: 800 10px/1.3 ui-monospace, SFMono-Regular, Consolas, monospace; text-align: center; }
.peak-button-meta { display: block; padding: 13px 13px 14px; }
.peak-button-meta b, .peak-button-meta span { display: block; }
.peak-button-meta b { min-height: 38px; font-size: 15px; line-height: 1.18; text-transform: uppercase; }
.peak-button-meta span { margin-top: 6px; color: var(--muted); font: 800 11px/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.peak-button-status { position: absolute; top: 8px; left: 8px; z-index: 2; padding: 5px 6px; background: rgba(11, 25, 43, .9); color: var(--green); font: 800 8px/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .08em; }
.peak-button-status.is-missing { color: var(--red); }

.site-footer { display: flex; justify-content: space-between; gap: 24px; padding: 24px clamp(20px, 4vw, 64px); border-top: 1px solid var(--soft-edge); background: #081523; color: var(--muted); font: 700 10px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .06em; }
.site-footer p { margin: 0; }

@media (max-width: 900px) {
  .site-header, .intro, .peak-library > header { align-items: flex-start; }
  .site-header, .intro { grid-template-columns: 1fr; flex-direction: column; }
  .header-links { justify-content: flex-start; }
  .compare { grid-template-columns: 1fr; gap: 20px; }
  .compare-divider { display: none; }
  .controls-and-facts { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  main { padding-inline: 12px; }
  .site-header { padding-inline: 16px; }
  .intro { margin-bottom: 38px; }
  .peak-heading { grid-template-columns: minmax(0, 1fr) auto; align-items: end; }
  .peak-number { grid-column: 1; grid-row: 1; }
  .peak-title { grid-column: 1 / -1; grid-row: 2; min-width: 0; }
  .peak-title h2 { font-size: clamp(26px, 7.6vw, 36px); overflow-wrap: anywhere; }
  .game-target { grid-column: 2; grid-row: 1; text-align: right; }
  .art-panel > header { align-items: flex-start; }
  .asset-state { white-space: normal; text-align: right; }
  .altimeter-readout { grid-template-columns: 1fr; }
  .card-header { flex-direction: column; }
  .light-control { align-items: flex-start; flex-direction: column; }
  .peak-library > header, .site-footer { align-items: flex-start; flex-direction: column; }
  .peak-strip { grid-auto-columns: minmax(148px, 62vw); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}