/* =========================================================================
   Neon Drift — interface styling
   The canvas owns the game world; everything here is HUD, menus and chrome.
   Two palettes: synthwave night (dark) and sunset daylight (light).
   ========================================================================= */

:root {
  --font-display: "Orbitron", "Eurostile", "Bank Gothic", "Avenir Next", system-ui, sans-serif;
  --font-ui: "Orbitron", "Avenir Next", system-ui, -apple-system, "Segoe UI", sans-serif;

  /* synthwave night */
  --bg: #07040f;
  --bg-2: #150a2a;
  --ink: #f4ecff;
  --ink-dim: #b9a6d8;
  --ink-faint: #7d6b9c;
  --panel: rgba(16, 8, 32, 0.82);
  --panel-line: rgba(255, 90, 210, 0.42);
  --panel-line-soft: rgba(120, 200, 255, 0.22);
  --neon-a: #ff3fb4;
  --neon-b: #2ce8ff;
  --neon-c: #ffe15c;
  --good: #55ffa8;
  --bad: #ff5a72;
  --lock: #6a5c86;
  --focus: #ffe15c;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.65);
  --glow-a: 0 0 14px rgba(255, 63, 180, 0.75);
  --glow-b: 0 0 14px rgba(44, 232, 255, 0.65);
}

:root[data-theme="light"] {
  /* sunset daylight */
  --bg: #ffe8d5;
  --bg-2: #ffd0e3;
  --ink: #2b0f3d;
  --ink-dim: #6a3f74;
  --ink-faint: #916b96;
  --panel: rgba(255, 250, 246, 0.88);
  --panel-line: rgba(214, 30, 122, 0.45);
  --panel-line-soft: rgba(70, 60, 160, 0.22);
  --neon-a: #d61e7a;
  --neon-b: #0f7fc4;
  --neon-c: #a8620a;
  --good: #14874f;
  --bad: #c8243c;
  --lock: #a38fa8;
  --focus: #8a2bd6;
  --shadow: 0 18px 50px rgba(120, 60, 90, 0.28);
  --glow-a: 0 0 12px rgba(214, 30, 122, 0.35);
  --glow-b: 0 0 12px rgba(15, 127, 196, 0.3);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

#app { position: fixed; inset: 0; }

#stage {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

#vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse at 50% 45%, rgba(0,0,0,0) 45%, rgba(0,0,0,0.5) 100%);
}
:root[data-theme="light"] #vignette {
  background: radial-gradient(ellipse at 50% 45%, rgba(0,0,0,0) 52%, rgba(110,50,80,0.28) 100%);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.noscript {
  position: absolute;
  inset: auto 0 0 0;
  padding: 1rem;
  text-align: center;
  color: var(--bad);
}

/* ------------------------------------------------------------------ HUD --- */

.hud {
  position: absolute;
  inset: 0;
  pointer-events: none;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hud-panel {
  position: absolute;
  background: var(--panel);
  border: 1px solid var(--panel-line-soft);
  border-radius: 10px;
  padding: 8px 12px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
  min-width: 128px;
}

.hud-tl { top: 14px; left: 14px; }
.hud-tc { top: 14px; left: 50%; transform: translateX(-50%); text-align: center; min-width: 180px; }
.hud-tr { top: 14px; right: 14px; text-align: right; }
.hud-bl { bottom: 14px; left: 14px; }
.hud-br { bottom: 14px; right: 14px; text-align: right; opacity: 0.85; }

.hud-line { display: flex; justify-content: space-between; gap: 14px; align-items: baseline; }
.hud-tr .hud-line, .hud-br .hud-line { justify-content: flex-end; }

.hud-key { color: var(--ink-faint); font-size: 11px; }
.hud-val { font-variant-numeric: tabular-nums; font-weight: 700; }
.hud-big { font-size: 20px; }
.hud-sm { font-size: 11px; color: var(--ink-dim); font-weight: 500; }
.hud-delta { font-size: 24px; font-weight: 900; color: var(--ink); display: block; margin-top: 2px; }
.hud-delta.ahead { color: var(--good); text-shadow: 0 0 12px rgba(85, 255, 168, 0.4); }
.hud-delta.behind { color: var(--bad); text-shadow: 0 0 12px rgba(255, 90, 114, 0.4); }

/* ------------------------------------------------------------ countdown --- */

.countdown {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: start center;
  padding-top: 18vh;
  pointer-events: none;
}
.countdown[hidden] { display: none; }
.countdown span {
  font-family: var(--font-display);
  font-size: clamp(46px, 8vw, 96px);
  font-weight: 900;
  color: var(--neon-c);
  text-shadow: 0 0 30px rgba(255, 225, 92, 0.6), 0 0 60px rgba(255, 63, 180, 0.4);
  letter-spacing: 0.08em;
}
.countdown.go span { color: var(--good); text-shadow: 0 0 30px rgba(85, 255, 168, 0.7); }

/* -------------------------------------------------------------- screens --- */

#screens { position: absolute; inset: 0; display: grid; place-items: center; padding: 18px; }
.screen { width: 100%; height: 100%; display: grid; place-items: center; overflow: auto; }
.screen[hidden] { display: none; }

.sheet {
  width: min(980px, 100%);
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: 16px;
  padding: clamp(16px, 3vw, 34px);
  box-shadow: var(--shadow), inset 0 0 60px rgba(255, 63, 180, 0.06);
  backdrop-filter: blur(10px);
}
.sheet-narrow { width: min(620px, 100%); }

.eyebrow {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--neon-b);
}
.sheet h1 {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 32px);
  line-height: 1.18;
  margin: 0 0 8px;
  text-shadow: var(--glow-a);
}
.sheet h2 {
  font-family: var(--font-display);
  font-size: clamp(16px, 2vw, 22px);
  margin: 0 0 10px;
  letter-spacing: 0.02em;
}
.sub { margin: 0; color: var(--ink-dim); font-size: 13px; line-height: 1.6; }
.verdict { margin: 0 0 14px; font-size: 15px; line-height: 1.6; color: var(--ink); }
.verdict strong { color: var(--neon-a); }

.pane-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(14px, 2.4vw, 30px);
  margin-top: 22px;
}
.pane h2 { font-size: 12px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--ink-faint); }
.pane p { font-size: 13px; line-height: 1.65; color: var(--ink-dim); margin: 0 0 10px; }

.keys { list-style: none; margin: 0; padding: 0; font-size: 12.5px; }
.keys li { display: flex; gap: 10px; align-items: baseline; padding: 3px 0; color: var(--ink-dim); }
.keys li span { color: var(--ink-faint); }
kbd {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  border: 1px solid var(--panel-line-soft);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 6px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
}
:root[data-theme="light"] kbd { background: rgba(255, 255, 255, 0.7); }

/* -------------------------------------------------------------- ladder --- */

.ladder { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 10px; }
.ladder-compact { margin: 12px 0 4px; }

.track {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--panel-line-soft);
  background: linear-gradient(90deg, rgba(255, 63, 180, 0.09), rgba(44, 232, 255, 0.05));
  transition: border-color 120ms linear, transform 120ms ease-out;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  width: 100%;
}
:root[data-theme="light"] .track { background: linear-gradient(90deg, rgba(214, 30, 122, 0.09), rgba(15, 127, 196, 0.06)); }
.track:hover:not([disabled]) { border-color: var(--neon-b); }

.track .track-index {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  color: var(--neon-b);
  text-align: center;
}
.track-body { display: block; min-width: 0; }
.track-name { display: block; font-size: 15px; font-weight: 700; letter-spacing: 0.03em; }
.track-note { display: block; font-size: 12px; color: var(--ink-dim); margin-top: 3px; line-height: 1.45; }
.track-times { display: grid; gap: 2px; font-size: 12px; color: var(--ink-dim); text-align: right; white-space: nowrap; }
.track-time-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.track-times b { color: var(--ink); font-variant-numeric: tabular-nums; }

.track.is-locked { opacity: 0.62; background: none; border-style: dashed; }
.track.is-locked .track-index { color: var(--lock); }
.track.is-current { border-color: var(--neon-a); box-shadow: 0 0 0 1px var(--neon-a), var(--glow-a); }
.track.is-done .track-index::after { content: " \2713"; font-size: 13px; color: var(--good); }
.track.just-unlocked { animation: unlock 900ms ease-out 2; }
@keyframes unlock {
  0%, 100% { box-shadow: 0 0 0 1px transparent; }
  40% { box-shadow: 0 0 0 2px var(--neon-c), 0 0 30px rgba(255, 225, 92, 0.55); }
}

.lock-badge {
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lock);
  border: 1px solid var(--lock);
  border-radius: 20px;
  padding: 2px 8px;
}

/* ------------------------------------------------------------- buttons --- */

.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.btn {
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--panel-line-soft);
  border-radius: 9px;
  padding: 11px 18px;
  cursor: pointer;
  transition: background 120ms linear, border-color 120ms linear, transform 90ms ease-out;
}
:root[data-theme="light"] .btn { background: rgba(255, 255, 255, 0.75); }
.btn:hover { border-color: var(--neon-b); background: rgba(44, 232, 255, 0.12); }
.btn:active { transform: translateY(1px); }
.btn.btn-primary {
  color: #240a1c;
  background: linear-gradient(90deg, var(--neon-a), var(--neon-c));
  border-color: transparent;
  box-shadow: var(--glow-a);
}
:root[data-theme="light"] .btn.btn-primary { color: #fff8f2; }
.btn.btn-primary:hover { filter: brightness(1.08); }
.btn-quiet { color: var(--ink-dim); }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 6px; }

/* --------------------------------------------------------------- stats --- */

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(128px, 1fr)); gap: 10px; margin: 0 0 6px; }
.stats div {
  border: 1px solid var(--panel-line-soft);
  border-radius: 10px;
  padding: 9px 12px;
  background: rgba(255, 255, 255, 0.035);
}
:root[data-theme="light"] .stats div { background: rgba(255, 255, 255, 0.6); }
.stats dt { font-size: 10.5px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-faint); }
.stats dd { margin: 4px 0 0; font-size: 18px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stats dd.ahead { color: var(--good); }
.stats dd.behind { color: var(--bad); }

.fine { margin: 18px 0 0; font-size: 11.5px; color: var(--ink-faint); letter-spacing: 0.08em; }

/* --------------------------------------------------------------- touch --- */

.touch { position: absolute; inset: auto 0 0 0; display: flex; justify-content: space-between; padding: 14px; pointer-events: none; }
.touch[hidden] { display: none; }
.touch-pad { display: flex; gap: 10px; pointer-events: auto; }
.tbtn {
  width: 70px; height: 70px;
  border-radius: 50%;
  border: 1px solid var(--panel-line);
  background: var(--panel);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  touch-action: none;
}
.tbtn-go { border-color: var(--neon-c); }
.tbtn.is-down { background: var(--neon-a); color: #1a0714; }

/* --------------------------------------------------------- reduced motion --- */

:root[data-motion="reduced"] .track.just-unlocked { animation: none; }
:root[data-motion="reduced"] .btn { transition: none; }

@media (max-width: 720px) {
  .pane-grid { grid-template-columns: 1fr; }
  .track { grid-template-columns: 34px 1fr; }
  .track-times { grid-column: 2; text-align: left; }
  .hud-br { display: none; }
  .hud { font-size: 11px; }
  .hud-tc { min-width: 120px; }
  .hud-delta { font-size: 18px; }
}

@media (max-height: 560px) {
  .stats { display: none; }
}