/* ═══════════════════════════════════════════════════════════════════════════
   tron/public/style.css
   ═══════════════════════════════════════════════════════════════════════════
   Black and green, Spotify-inspired — the house look for every game in this
   repo: a near-black page, raised cards, ONE accent colour, and type that is
   quiet until it needs to be loud.

   Two rules in here are load-bearing rather than cosmetic:

   1. `[hidden] { display: none !important; }` is MANDATORY. The markup carries
      class="hidden" as an element's INITIAL state (so a panel cannot flash
      before app.js runs), while app.js toggles the attribute. Without this rule
      the class wins and a panel that must never be invisible — the sudden-death
      countdown, the kill feed's empty state — stays hidden for ever. The E2E
      suite caught exactly that on a sibling game.

   2. The arena is a CANVAS that is scaled by CSS, never by JavaScript. The
      drawing buffer is fixed, so the game gets free device-independent scaling
      and a phone viewport does not need a different code path.
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
  --bg: #000000;
  --bg-elev: #0b0b0b;
  --bg-card: #121212;
  --bg-hover: #1a1a1a;
  --border: #262626;
  --text: #ffffff;
  --text-dim: #b3b3b3;
  --text-faint: #7a7a7a;
  --accent: #1db954;
  --accent-bright: #1ed760;
  --danger: #e91429;
  --warn: #ffb020;
  --seat-1: #1db954;
  --seat-2: #1e90ff;
  --seat-3: #ffb020;
  --seat-4: #e040fb;
  --wall: #2b2b2b;
  --grid: #141414;
  --radius: 12px;
  --radius-sm: 8px;
}

html[data-theme='light'] {
  --bg: #f4f4f4;
  --bg-elev: #ffffff;
  --bg-card: #ffffff;
  --bg-hover: #ececec;
  --border: #d8d8d8;
  --text: #101010;
  --text-dim: #4a4a4a;
  --text-faint: #767676;
  --wall: #b9b9b9;
  --grid: #e6e6e6;
}

/* MANDATORY: see the header comment. */
[hidden] { display: none !important; }

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace; }
.muted { color: var(--text-dim); }
.small { font-size: 12.5px; }

.shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 18px 48px;
}

/* ── Header ────────────────────────────────────────────────────────────── */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 0;
}

.home-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.home-btn:hover { color: var(--text); border-color: var(--accent); background: var(--bg-hover); }
.home-btn svg { width: 16px; height: 16px; }

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { font-size: 22px; color: var(--accent); }
.brand-text { font-weight: 800; letter-spacing: 0.14em; font-size: 14px; }

.header-right { display: flex; align-items: center; gap: 10px; }
.user-badge { color: var(--text-dim); font-size: 12.5px; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.icon-btn:hover { color: var(--text); border-color: var(--accent); }
.icon-btn svg { width: 18px; height: 18px; }

/* ── Screens ───────────────────────────────────────────────────────────── */

.screen { display: none; }
.screen.active { display: block; }

.screen-title {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 8px 0 6px;
}
.screen-sub {
  color: var(--text-dim);
  max-width: 78ch;
  margin: 0 0 22px;
}

.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row.between { justify-content: space-between; }

/* ── Menu cards ────────────────────────────────────────────────────────── */

.menu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(255px, 1fr));
  gap: 16px;
}

.mode-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mode-card-proof { border-color: rgba(29, 185, 84, 0.45); }
.mode-icon { font-size: 24px; }
.mode-name { font-weight: 700; font-size: 17px; }
.mode-desc { color: var(--text-dim); font-size: 13.5px; flex: 1; }
.mode-form { display: flex; flex-direction: column; gap: 8px; margin-top: 6px; }
.field-label { font-size: 12px; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.06em; }

.join-row { display: flex; gap: 8px; }
.join-row input {
  flex: 1;
  min-width: 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 9px 12px;
  font-family: inherit;
  font-size: 16px;
  letter-spacing: 0.18em;
  text-align: center;
}

/* ── Controls ──────────────────────────────────────────────────────────── */

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 999px;
  padding: 9px 16px;
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.05s;
}
.btn:hover { background: var(--bg-hover); border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #04120a; }
.btn-primary:hover { background: var(--accent-bright); border-color: var(--accent-bright); }
.btn-danger:hover { border-color: var(--danger); color: var(--danger); }
.btn-sm { padding: 6px 12px; font-size: 12.5px; }

select, input[type='number'], input[type='text'] {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 8px 10px;
  font-family: inherit;
  font-size: 14px;
}
select:focus, input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.checkbox-row { display: flex; align-items: flex-start; gap: 10px; margin: 10px 0; }
.checkbox-row input { margin-top: 3px; accent-color: var(--accent); }
.field { display: flex; flex-direction: column; gap: 5px; margin: 8px 0; }
.field label { font-size: 12.5px; color: var(--text-dim); }

.banner {
  margin-top: 16px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  font-size: 13.5px;
}
.banner.error { border-color: var(--danger); color: #ff9aa6; }
.banner.good { border-color: var(--accent); color: var(--accent-bright); }

/* ── HUD ───────────────────────────────────────────────────────────────── */

.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 12px;
}
.hud-left { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.hud-badge {
  background: rgba(29, 185, 84, 0.16);
  border: 1px solid rgba(29, 185, 84, 0.5);
  color: var(--accent-bright);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.hud-clock { display: flex; flex-direction: column; }
.hud-label { font-size: 11px; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.07em; }
.hud-value { font-weight: 700; font-variant-numeric: tabular-nums; }
.hud-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Seat strip ────────────────────────────────────────────────────────── */

.seat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}
.seat-pill {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--seat-colour, var(--accent));
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.seat-pill.dead { opacity: 0.55; }
.seat-pill.you { border-color: var(--accent); }
.seat-top { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.seat-name { font-weight: 700; font-size: 13.5px; }
.seat-state { font-size: 11.5px; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.06em; }
.seat-nums { display: flex; gap: 14px; font-size: 12.5px; color: var(--text-dim); font-variant-numeric: tabular-nums; }
.meter { height: 5px; border-radius: 999px; background: var(--bg-elev); overflow: hidden; }
.meter > span { display: block; height: 100%; background: var(--seat-colour, var(--accent)); }

.online-strip {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  margin-bottom: 12px;
  font-size: 13px;
}
.online-strip strong { color: var(--accent-bright); letter-spacing: 0.16em; font-size: 16px; }

.shrink-warning {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 176, 32, 0.12);
  border: 1px solid rgba(255, 176, 32, 0.5);
  color: var(--warn);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  margin-bottom: 12px;
  font-size: 13.5px;
  font-weight: 600;
}
.shrink-warning.soon { animation: pulse 1s infinite; }
@keyframes pulse { 50% { background: rgba(255, 176, 32, 0.28); } }

/* ── Arena ─────────────────────────────────────────────────────────────── */

.arena-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 14px;
  align-items: start;
}
.canvas-holder { position: relative; }
#arena {
  width: 100%;
  height: auto;
  display: block;
  background: #050505;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  /* The grid is drawn on the canvas, so no CSS grid lines are needed. */
  image-rendering: pixelated;
}

.side-panel { display: flex; flex-direction: column; gap: 12px; }
.panel-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.panel-title {
  margin: 0 0 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
}
.proof-line { margin: 0 0 6px; font-weight: 700; color: var(--accent-bright); }

.kill-feed {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 260px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.kill-entry { font-size: 13px; display: flex; gap: 8px; align-items: baseline; }
.kill-entry .kill-tick { color: var(--text-faint); font-variant-numeric: tabular-nums; font-size: 11.5px; }
.kill-entry .kill-who { font-weight: 700; }
.kill-empty { color: var(--text-faint); font-size: 13px; font-style: italic; }

/* ── D-pad ─────────────────────────────────────────────────────────────── */

.dpad {
  position: absolute;
  right: 12px;
  bottom: 12px;
  display: grid;
  grid-template-columns: repeat(3, 46px);
  grid-template-rows: repeat(3, 46px);
  gap: 6px;
  opacity: 0.9;
}
.dpad-btn {
  border: 1px solid rgba(29, 185, 84, 0.5);
  background: rgba(0, 0, 0, 0.65);
  color: var(--accent-bright);
  border-radius: 10px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}
.dpad-btn:active { background: rgba(29, 185, 84, 0.35); }
/* Up / left / BOOST / right / down, laid out like a compass — the five buttons
   a thumb expects, and a second way to produce an identical intent. */
.dpad-btn[data-dir='0'] { grid-column: 2; grid-row: 1; }
.dpad-btn[data-dir='3'] { grid-column: 1; grid-row: 2; }
.dpad-boost { grid-column: 2; grid-row: 2; font-size: 11px; letter-spacing: 0.05em; }
.dpad-btn[data-dir='1'] { grid-column: 3; grid-row: 2; }
.dpad-btn[data-dir='2'] { grid-column: 2; grid-row: 3; }

/* ── Overlay ───────────────────────────────────────────────────────────── */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 40;
}
.overlay-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 460px;
  width: 100%;
  text-align: center;
}
.overlay-title { margin: 0 0 10px; font-size: 23px; font-weight: 800; }
.overlay-body { color: var(--text-dim); margin: 0 0 18px; }
.overlay-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ── Settings ──────────────────────────────────────────────────────────── */

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
code { background: var(--bg-elev); padding: 1px 5px; border-radius: 4px; font-size: 12.5px; }

/* ── Responsive ────────────────────────────────────────────────────────── */

@media (max-width: 900px) {
  .arena-wrap { grid-template-columns: minmax(0, 1fr); }
  .side-panel { order: 2; }
  .dpad { position: static; margin-top: 10px; justify-content: center; }
  .screen-title { font-size: 24px; }
}