:root {
  --bg: #05060a;
  --glass: rgba(9, 11, 15, 0.64);
  --glass-strong: rgba(8, 9, 13, 0.86);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.18);
  --text: #e8e6e0;
  --muted: #8b919c;
  --dim: #5d636d;
  --accent: #9fd8ff;
  --warn: #ffb52e;
  --bad: #ff5a4a;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --cond: "IBM Plex Sans Condensed", "IBM Plex Sans", "Arial Narrow", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --panel-w: 304px;
  --sheet-h: 0px;
}
html[data-body="mars"] { --accent: #ffb27a; }

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); font-family: var(--sans); overflow: hidden; -webkit-font-smoothing: antialiased; }
button { font: inherit; color: inherit; }

/* Scene: full bleed behind everything. */
.scene-shell { position: fixed; inset: 0 0 var(--sheet-h) 0; }
#sceneCanvas { width: 100%; height: 100%; display: block; background: #000; outline: none; cursor: grab; }
#sceneCanvas:active { cursor: grabbing; }
.scene-vignette { position: absolute; inset: 0; pointer-events: none; background: radial-gradient(ellipse 120% 90% at 50% 45%, transparent 55%, rgba(0, 0, 0, 0.42) 100%); }
.scene-fallback { position: absolute; top: 5rem; left: 1.5rem; color: var(--warn); font-family: var(--mono); font-size: 0.85rem; }
.terrain-banner, .delay-note {
  position: absolute; left: calc(50% - var(--panel-w) / 2); transform: translateX(-50%);
  margin: 0; padding: 0.35rem 0.8rem; border: 1px solid var(--line-strong); border-radius: 4px;
  background: var(--glass); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.04em; white-space: nowrap; max-width: 92vw; overflow: hidden; text-overflow: ellipsis;
}
.terrain-banner { top: 4.2rem; color: var(--warn); }
.no-data-legend { top: 4.2rem; color: var(--muted); cursor: help; }
.landmark-note { top: 6.4rem; color: var(--muted); }
.delay-note { bottom: 1.2rem; color: var(--accent); }

/* Top bar: wordmark left, level switch right. */
.topbar { position: fixed; top: 0; left: 0; right: 0; display: flex; align-items: center; justify-content: space-between; padding: 0.9rem 1.1rem; pointer-events: none; transition: opacity 0.5s ease; }
.topbar > * { pointer-events: auto; }
.identity strong { font-family: var(--cond); font-weight: 600; font-size: 1.05rem; letter-spacing: 0.32em; }
.identity small { display: block; margin-top: 0.1rem; color: var(--muted); font-size: 0.82rem; letter-spacing: 0.08em; }
.level-select { display: flex; border: 1px solid var(--line-strong); border-radius: 5px; overflow: hidden; background: var(--glass); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.level-btn { background: transparent; border: 0; padding: 0.42rem 0.85rem; cursor: pointer; color: var(--muted); font-family: var(--cond); font-size: 0.85rem; letter-spacing: 0.06em; }
.level-btn span { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); margin-left: 0.35rem; }
.level-btn + .level-btn { border-left: 1px solid var(--line); }
.level-btn[aria-pressed="true"] { color: var(--text); background: rgba(255, 255, 255, 0.06); box-shadow: inset 0 -2px 0 var(--accent); }
.level-btn:focus-visible, .pad-btn:focus-visible, .level-card:focus-visible, .title-start:focus-visible, #mission-panel button:focus-visible { outline: 1px solid var(--accent); outline-offset: 2px; }

/* Side panel: dark glass, thin lines, monospace numerals. */
.hud {
  position: fixed; top: 3.9rem; right: 1rem; width: var(--panel-w); max-height: calc(100% - 4.9rem); overflow-y: auto;
  padding: 0.9rem 1rem 1rem; border: 1px solid var(--line); border-radius: 6px;
  background: var(--glass); backdrop-filter: blur(16px) saturate(115%); -webkit-backdrop-filter: blur(16px) saturate(115%);
  transition: opacity 0.5s ease, transform 0.5s ease; scrollbar-width: thin; scrollbar-color: var(--line-strong) transparent;
}
.hud-eyebrow { display: flex; align-items: center; gap: 0.5rem; margin: 0 0 0.75rem; font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.hud-eyebrow em { font-style: normal; color: var(--dim); margin-left: auto; letter-spacing: 0.08em; }
.link-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); animation: link 2.4s ease-in-out infinite; }
@keyframes link { 50% { opacity: 0.35; } }
.hud-row { display: grid; grid-template-columns: 1fr 1fr; margin: 0 0 0.9rem; border-top: 1px solid var(--line); }
.hud-row > div { padding: 0.5rem 0 0.45rem; border-bottom: 1px solid var(--line); }
.hud-row > div:nth-child(odd):not(.wide) { padding-right: 0.6rem; border-right: 1px solid var(--line); }
.hud-row > div:nth-child(even) { padding-left: 0.7rem; }
.hud-row > .wide { grid-column: 1 / -1; padding-left: 0; }
.hud-row dt { color: var(--muted); font-size: 0.82rem; letter-spacing: 0.12em; text-transform: uppercase; }
.hud-row dd { margin: 0.18rem 0 0; font-family: var(--mono); font-size: 1rem; font-variant-numeric: tabular-nums; color: var(--text); white-space: nowrap; }
#hudDelay, #hudGoalDist { color: var(--accent); }

.touchpad { display: grid; justify-items: center; gap: 0.35rem; margin: 0.4rem 0 0.8rem; }
.pad-mid { display: flex; gap: 3.2rem; }
.pad-btn { width: 3.1rem; height: 3.1rem; background: rgba(255, 255, 255, 0.04); border: 1px solid var(--line-strong); border-radius: 6px; color: var(--text); font-size: 0.95rem; cursor: pointer; touch-action: manipulation; user-select: none; -webkit-user-select: none; }
.pad-btn:active { background: color-mix(in srgb, var(--accent) 22%, transparent); border-color: var(--accent); }
@media (hover: hover) and (pointer: fine) { .touchpad { display: none; } }
.controls-help { margin: 0 0 0.6rem; color: var(--muted); font-size: 0.82rem; line-height: 1.45; }

/* Mission panel (rendered by hud.js into the side panel). */
#mission-panel { border-top: 1px solid var(--line); padding-top: 0.75rem; font-size: 0.82rem; line-height: 1.45; }
#mission-panel p { margin: 0 0 0.5rem; }
#mission-panel [hidden] { display: none !important; }
.mission-brief-lines p:first-child { font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.12em; color: var(--accent); }
.mission-brief-lines p { color: #c9c7c1; }
#mission-panel button, .mp-btn {
  display: block; width: 100%; margin: 0.4rem 0 0; padding: 0.6rem 0.75rem; cursor: pointer; text-align: left;
  background: transparent; border: 1px solid var(--line-strong); border-radius: 4px; color: var(--text);
  font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.06em; transition: background 0.2s, border-color 0.2s;
}
#mission-panel button:hover:not(:disabled) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
#mission-panel button:disabled { opacity: 0.4; cursor: default; }
.mission-start-btn, .mission-uplink-btn, .mission-retry-btn, .mission-copy-btn { border-color: color-mix(in srgb, var(--accent) 60%, transparent) !important; color: var(--accent) !important; text-transform: uppercase; }
.mission-endcard-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.5rem; }
.mission-plan-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem; }
.mission-plan-controls button { margin: 0 !important; text-align: center !important; }
.mission-minimap { display: block; width: 100%; height: auto; aspect-ratio: 1; border: 1px solid var(--line-strong); border-radius: 4px; cursor: crosshair; image-rendering: auto; margin: 0.3rem 0; }
.mission-minimap:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.mission-delay-note, .mission-plan-help, .mp-note { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); }
.mission-guardrails { margin: 0.6rem 0; border-top: 1px solid var(--line); }
.mission-guardrail-row, .mp-row { display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; padding: 0.4rem 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 0.82rem; }
.mission-guardrail-row input[type="number"] { width: 4.6rem; padding: 0.25rem 0.4rem; background: rgba(0, 0, 0, 0.35); border: 1px solid var(--line-strong); border-radius: 3px; color: var(--text); font-family: var(--mono); font-size: 0.82rem; text-align: right; }
.mission-guardrail-row input[type="checkbox"] { accent-color: var(--accent); width: 1rem; height: 1rem; }
.mission-status-line { font-family: var(--mono); font-size: 0.82rem; color: var(--text); padding-left: 0.55rem; border-left: 2px solid var(--accent); min-height: 1em; }
.mission-status-line:empty { display: none; }
.mission-endcard { margin: 0.6rem 0; padding: 0.75rem; border: 1px solid var(--line-strong); border-radius: 5px; background: rgba(0, 0, 0, 0.3); }
.mission-endcard-outcome { font-family: var(--cond); font-size: 1.05rem; letter-spacing: 0.08em; color: var(--accent); }
.mission-endcard-line { color: #c9c7c1; }
.mission-scoreboard { margin-top: 0.8rem; padding-top: 0.6rem; border-top: 1px solid var(--line); }
.mission-scoreboard-title { font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.mission-scoreboard-row { font-family: var(--mono); font-size: 0.82rem; color: #c9c7c1; margin: 0 0 0.2rem !important; }
.mission-scoreboard-calibration { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); margin: 0.3rem 0 0 !important; }
.mission-dry-run-btn { border-color: color-mix(in srgb, var(--accent) 40%, var(--line-strong)) !important; text-align: center !important; }
.mission-dry-run-result { margin: 0.4rem 0; padding: 0.5rem 0.6rem; border: 1px solid var(--line); border-radius: 4px; background: rgba(0, 0, 0, 0.25); font-family: var(--mono); font-size: 0.78rem; color: var(--muted); }
.mission-dry-run-result p { margin: 0 0 0.25rem; }
.mission-dry-run-result p:last-child { margin-bottom: 0; }
.mission-endcard-objectives { list-style: none; margin: 0 0 0.5rem; padding: 0; font-family: var(--mono); font-size: 0.8rem; }
.mission-objective { padding: 0.15rem 0; }
.mission-objective.met { color: var(--accent); }
.mission-objective.unmet { color: var(--muted); }
.mission-endcard-predicted { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); }
.mission-endcard-drift { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); }
.mission-endcard-tracks { display: block; width: 100%; max-width: 220px; height: auto; aspect-ratio: 1; border: 1px solid var(--line-strong); border-radius: 4px; margin: 0.4rem 0; }
.mission-tracks-legend { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); }
.mission-historic-map { display: block; width: 100%; max-width: 220px; height: auto; aspect-ratio: 1; border: 1px solid var(--line-strong); border-radius: 4px; margin: 0.4rem 0; }
.mission-historic-match { font-family: var(--mono); font-size: 0.8rem; color: #ff9d3c; }

/* Title screen over the live scene. */
.title-screen {
  position: fixed; inset: 0; z-index: 10; display: flex; align-items: safe center; overflow-y: auto; /* safe: with 7 level cards the title can outgrow the viewport; overflow then scrolls at the bottom instead of clipping the top */
  background:
    linear-gradient(90deg, rgba(4, 5, 8, 0.94) 0%, rgba(4, 5, 8, 0.8) 34%, rgba(4, 5, 8, 0.15) 66%, rgba(4, 5, 8, 0) 100%),
    linear-gradient(0deg, rgba(4, 5, 8, 0.7) 0%, rgba(4, 5, 8, 0) 30%);
  opacity: 0; visibility: hidden; transition: opacity 0.7s ease, visibility 0s linear 0.7s;
}
body.title-open .title-screen { opacity: 1; visibility: visible; transition: opacity 0.7s ease; }
body.title-open .topbar, body.title-open .hud, body.title-open .terrain-banner, body.title-open .delay-note { opacity: 0; pointer-events: none; }
body.title-open .hud { transform: translateY(10px); }
.title-inner { width: min(900px, 100%); padding: 4vh 0 4vh 6vw; }
.title-eyebrow { margin: 0 0 1.1rem; font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted); }
.wordmark { margin: 0; font-family: var(--cond); font-weight: 600; font-size: clamp(4.2rem, 10vw, 8rem); line-height: 0.86; letter-spacing: 0.14em; color: #f2f0ea; margin-left: -0.04em; }
.title-sub { margin: 0.9rem 0 0; font-family: var(--cond); font-size: clamp(1.3rem, 2.4vw, 1.75rem); color: var(--accent); letter-spacing: 0.03em; }
.title-story { margin: 0.9rem 0 1.3rem; max-width: 44ch; color: #b9b8b3; font-size: 0.95rem; line-height: 1.6; }
.level-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.6rem; margin-bottom: 1.3rem; }
@media (max-width: 980px) { .level-cards { grid-template-columns: 1fr 1fr 1fr; gap: 0.7rem; } }
.level-card {
  display: flex; flex-direction: column; align-items: flex-start; gap: 0.2rem; padding: 0.8rem 0.9rem 0.85rem; text-align: left; cursor: pointer;
  background: rgba(255, 255, 255, 0.03); border: 1px solid var(--line-strong); border-radius: 6px; transition: border-color 0.25s, background 0.25s;
}
.level-card:hover { background: rgba(255, 255, 255, 0.06); }
.level-card[aria-checked="true"] { border-color: var(--card-accent); background: color-mix(in srgb, var(--card-accent) 7%, transparent); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--card-accent) 40%, transparent); }
.level-card[data-level="lunokhod"] { --card-accent: #9fd8ff; }
.level-card[data-level="tycho"] { --card-accent: #c9c8ff; }
.level-card[data-level="mars"] { --card-accent: #ffb27a; }
.level-card[data-level="change4"] { --card-accent: #d6c37a; }
.level-card[data-level="apollo17"] { --card-accent: #cfd4d8; }
.level-card[data-level="change3"] { --card-accent: #e0cf8e; }
.level-card[data-level="apollo15"] { --card-accent: #b9d3c4; }
.card-name { font-family: var(--cond); font-weight: 600; font-size: 1.3rem; letter-spacing: 0.06em; }
.card-meta { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); letter-spacing: 0.04em; }
.card-delay { margin-top: 0.4rem; font-family: var(--mono); font-size: 1.5rem; color: var(--card-accent); font-variant-numeric: tabular-nums; }
.card-note { font-size: 0.82rem; color: var(--muted); }
.title-start {
  padding: 0.85rem 2.6rem; cursor: pointer; border: 0; border-radius: 4px; background: #f2f0ea; color: #0a0b0e;
  font-family: var(--mono); font-weight: 500; font-size: 0.85rem; letter-spacing: 0.28em; text-transform: uppercase; transition: background 0.25s, transform 0.25s;
}
.title-start:hover { background: var(--accent); }
.title-start:active { transform: translateY(1px); }
.title-credits { margin: 2rem 0 0; max-width: 52ch; font-size: 0.82rem; line-height: 1.5; color: var(--muted); }

/* Phones: scene on top, panel as a bottom sheet, title stacks at the bottom. */
@media (max-width: 720px) {
  :root { --sheet-h: 40vh; --panel-w: 0px; }
  .topbar { padding: 0.7rem 0.8rem; }
  .identity small { display: none; }
  .about-data-btn { display: none; } /* the title-screen link covers this before Start; topbar is too tight for it in-game */
  .terrain-banner, .no-data-legend { white-space: normal; max-width: 80vw; text-align: center; }
  /* H2 fix: at phone widths the top bar is too narrow to fit all 5 level
     buttons at full size (Jezero was clipped off-screen by .level-select's
     base overflow:hidden). Hide the planet-suffix span, stop labels from
     wrapping, and let the bar scroll horizontally instead of clipping, so
     every level stays reachable. */
  .level-select { max-width: calc(100vw - 6.5rem); overflow-x: auto; overflow-y: hidden; -webkit-overflow-scrolling: touch; }
  .level-btn { padding: 0.38rem 0.65rem; font-size: 0.82rem; white-space: nowrap; flex-shrink: 0; }
  .level-btn span { display: none; }
  .hud { top: auto; left: 0; right: 0; bottom: 0; width: auto; height: var(--sheet-h); max-height: none; border-radius: 12px 12px 0 0; border-left: 0; border-right: 0; border-bottom: 0; background: var(--glass-strong); padding: 0.7rem 1rem calc(0.8rem + env(safe-area-inset-bottom)); }
  .hud-row { grid-template-columns: 1fr 1fr 1fr; }
  .hud-row > div { padding: 0.4rem 0.4rem 0.35rem !important; border-right: 1px solid var(--line) !important; }
  .hud-row > div:nth-child(3n) { border-right: 0 !important; }
  .hud-row > .wide { grid-column: auto; }
  .hud-row dd { font-size: 0.86rem; }
  .touchpad { margin: 0.2rem 0 0.6rem; }
  .terrain-banner { top: 3.4rem; left: 50%; }
  .landmark-note { top: 5.6rem; }
  .delay-note { bottom: 0.6rem; left: 50%; }
  .title-screen { align-items: safe flex-end; background: linear-gradient(0deg, rgba(4, 5, 8, 0.96) 0%, rgba(4, 5, 8, 0.88) 55%, rgba(4, 5, 8, 0.1) 85%); }
  .title-inner { padding: 1.2rem 1rem calc(1.4rem + env(safe-area-inset-bottom)); } /* 7 level cards fill the phone; no spacer above the eyebrow */
  .title-eyebrow { font-size: 0.82rem; letter-spacing: 0.14em; margin-bottom: 0.6rem; }
  .title-story { font-size: 0.86rem; margin: 0.7rem 0 1.1rem; }
  .level-cards { grid-template-columns: 1fr 1fr; gap: 0.45rem; margin-bottom: 1rem; }
  .level-card { padding: 0.6rem 0.65rem 0.65rem; }
  .card-name { font-size: 1.1rem; }
  .card-delay { font-size: 1.15rem; margin-top: 0.35rem; }
  .card-note { display: none; }
  .title-start { width: 100%; }
  .title-credits { margin-top: 1rem; font-size: 0.82rem; }
}
.about-data-btn { background: transparent; border: 1px solid var(--line-strong); border-radius: 4px; padding: 0.35rem 0.7rem; color: var(--muted); font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.04em; cursor: pointer; }
.about-data-btn:hover { color: var(--text); border-color: var(--accent); }
.about-data-link { background: none; border: 0; padding: 0; margin-left: 0.4em; color: var(--accent); text-decoration: underline; cursor: pointer; font: inherit; font-size: 0.82rem; }
.about-data-panel { position: fixed; inset: 0; z-index: 50; align-items: center; justify-content: center; background: rgba(4, 5, 8, 0.78); padding: 1.5rem; }
.about-data-panel[hidden] { display: none; }
.about-data-panel:not([hidden]) { display: flex; }
.about-data-inner { max-width: 46rem; max-height: 82vh; overflow-y: auto; background: var(--glass-strong); border: 1px solid var(--line-strong); border-radius: 10px; padding: 1.4rem 1.6rem; }
.about-data-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.8rem; }
.about-data-head h2 { margin: 0; font-family: var(--cond); font-weight: 600; letter-spacing: 0.08em; font-size: 1.15rem; color: var(--text); }
.about-data-close { background: transparent; border: 0; color: var(--muted); font-size: 1.4rem; line-height: 1; cursor: pointer; padding: 0.2rem 0.5rem; }
.about-data-close:hover { color: var(--text); }
.about-data-intro { margin: 0 0 1.1rem; color: #c9c7c1; font-size: 0.92rem; line-height: 1.55; }
.about-data-list { display: grid; gap: 0.9rem; margin: 0; }
.about-data-list dt { font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.25rem; }
.about-data-list dd { margin: 0; color: #c9c7c1; font-size: 0.92rem; line-height: 1.55; }
@media (max-width: 720px) {
  .about-data-btn { padding: 0.3rem 0.55rem; }
  .about-data-inner { max-height: 78vh; padding: 1.1rem 1.2rem; }
}
@media (prefers-reduced-motion: reduce) { .link-dot { animation: none; } * { transition-duration: 0.01s !important; } }

/* L4: a small, non-blocking toast for a caught render-loop error - the loop
   keeps running, this just tells the player something recovered. */
.tycho-toast {
  position: fixed; left: 50%; bottom: 1.2rem; z-index: 60; max-width: min(92vw, 42rem);
  transform: translate(-50%, 8px); padding: 0.55rem 0.9rem; border: 1px solid var(--line-strong); border-radius: 6px;
  background: var(--glass-strong); color: var(--warn); font-family: var(--mono); font-size: 0.82rem; line-height: 1.4;
  opacity: 0; pointer-events: none; transition: opacity 0.25s ease, transform 0.25s ease;
}
.tycho-toast.visible { opacity: 1; transform: translate(-50%, 0); }
.free-drive-toggle { display: flex; align-items: center; gap: 0.4rem; margin-top: 0.5rem; font-size: 0.8rem; color: var(--muted); cursor: pointer; }
.free-drive-toggle span { color: var(--muted); opacity: 0.8; }
.free-drive-toggle input:disabled + * , .free-drive-toggle:has(input:disabled) { opacity: 0.5; cursor: not-allowed; }