/* ============================================================================
   Bus Simulator Ultimate — Phase 1 (Engine Core) styles
   Mobile-first, landscape-oriented, safe-area aware.
   ========================================================================== */

:root {
  --bg: #0b1020;
  --fg: #e8ecf5;
  --muted: #8b94ad;
  --accent: #ffb454;
  --accent-2: #3ddc84;
  --danger: #ff5b5b;
  --panel: rgba(12, 16, 30, 0.86);
  --border: rgba(255, 255, 255, 0.08);
  --sat: env(safe-area-inset-top, 0px);
  --sar: env(safe-area-inset-right, 0px);
  --sab: env(safe-area-inset-bottom, 0px);
  --sal: env(safe-area-inset-left, 0px);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  overscroll-behavior: none;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
}

/* ----------------------------------------------------------------------------
   Game canvas — fills the viewport under everything else
   -------------------------------------------------------------------------- */
#game-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  outline: none;
  touch-action: none;
  background: #000;
}

/* ----------------------------------------------------------------------------
   Boot overlay
   -------------------------------------------------------------------------- */
.boot {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: calc(16px + var(--sat)) calc(16px + var(--sar)) calc(16px + var(--sab)) calc(16px + var(--sal));
  background:
    radial-gradient(120% 80% at 50% 0%, rgba(255, 180, 84, 0.14), transparent 60%),
    radial-gradient(90% 70% at 50% 100%, rgba(61, 220, 132, 0.08), transparent 60%),
    var(--bg);
  transition: opacity 0.4s ease;
}
.boot.is-hidden { opacity: 0; pointer-events: none; }
.boot.is-error .boot-bar { background: var(--danger); width: 100% !important; }
.boot.is-error .boot-label { color: var(--danger); }

.boot-inner {
  width: min(92vw, 420px);
  text-align: center;
}

.boot-logo { margin-bottom: 10px; }
.boot-bus {
  display: inline-block;
  font-size: 56px;
  line-height: 1;
  filter: drop-shadow(0 8px 18px rgba(255, 180, 84, 0.35));
  animation: bob 2.2s ease-in-out infinite;
}
@keyframes bob {
  0%, 100% { transform: translateY(0) rotate(-2deg); }
  50% { transform: translateY(-6px) rotate(2deg); }
}

.boot-title {
  margin: 0;
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
}
.boot-title span { color: var(--accent); }

.boot-sub {
  margin: 4px 0 18px;
  color: var(--muted);
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.boot-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.boot-bar {
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.25s ease;
}

.boot-label {
  margin: 12px 0 4px;
  font-size: 14px;
  font-weight: 600;
}
.boot-detail {
  margin: 0;
  min-height: 1.4em;
  color: var(--muted);
  font-size: 11px;
  font-family: var(--mono);
  white-space: pre-line;
  word-break: break-word;
}

.boot-start {
  margin-top: 20px;
  min-height: 48px;
  padding: 0 28px;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: #1a1200;
  font: 700 16px var(--sans);
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(255, 180, 84, 0.35);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.boot-start:active { transform: scale(0.97); box-shadow: 0 4px 12px rgba(255, 180, 84, 0.3); }
.boot-start[hidden] { display: none; }

/* ----------------------------------------------------------------------------
   Rotate hint (portrait phones only)
   -------------------------------------------------------------------------- */
.rotate-hint {
  display: none;
  position: fixed;
  left: 50%;
  bottom: calc(18px + var(--sab));
  transform: translateX(-50%);
  z-index: 90;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--fg);
  font-size: 13px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  white-space: nowrap;
}
.rotate-hint span {
  display: inline-block;
  margin-right: 6px;
  animation: spin 2.4s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (orientation: portrait) and (max-width: 900px) {
  .rotate-hint { display: block; }
}

/* ----------------------------------------------------------------------------
   Debug HUD
   -------------------------------------------------------------------------- */
#debug-hud {
  position: fixed;
  top: calc(6px + var(--sat));
  left: calc(6px + var(--sal));
  z-index: 80;
  font: 12px var(--mono);
  color: var(--fg);
  max-width: calc(100vw - 12px - var(--sal) - var(--sar));
}

.hud-bar {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: inherit;
  font: inherit;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  white-space: nowrap;
}
.hud-fps { color: var(--accent-2); font-weight: 700; font-size: 14px; }
.hud-fps.is-bad { color: var(--danger); }
.hud-unit { color: var(--muted); font-size: 10px; }
.hud-sep { color: var(--muted); opacity: 0.6; }
.hud-backend { color: var(--accent); }
.hud-backend.is-webgpu { color: #7cc4ff; }
.hud-preset { text-transform: uppercase; color: var(--muted); font-size: 10px; }

.hud-panel {
  margin-top: 6px;
  width: min(92vw, 720px);
  max-height: calc(100dvh - 60px - var(--sat) - var(--sab));
  overflow: auto;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  touch-action: pan-y;
  -webkit-overflow-scrolling: touch;
}
.hud-panel[hidden] { display: none; }

#hud-graph {
  display: block;
  width: 100%;
  height: 48px;
  border-radius: 6px;
  margin-bottom: 10px;
}

.hud-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 8px;
}

.hud-card {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  min-width: 0;
}
.hud-card--log { grid-column: 1 / -1; }
.hud-card h3 {
  margin: 0 0 6px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.hud-card dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
}
.hud-card dt { color: var(--muted); }
.hud-card dd { margin: 0; text-align: right; word-break: break-word; }
.hud-reasons {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.4;
}

.hud-seg {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}
.hud-seg button,
.hud-actions button {
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--fg);
  font: inherit;
  text-transform: capitalize;
  cursor: pointer;
}
.hud-seg button.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a1200;
  font-weight: 700;
}
.hud-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 30px;
  cursor: pointer;
}
.hud-toggle input { width: 16px; height: 16px; accent-color: var(--accent); }
.hud-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

#hud-log {
  margin: 0;
  max-height: 160px;
  overflow: auto;
  font-size: 10.5px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--muted);
}

.hud-toast {
  position: fixed;
  left: 50%;
  top: calc(56px + var(--sat));
  transform: translate(-50%, -8px);
  z-index: 85;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--fg);
  font: 12px var(--mono);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  white-space: nowrap;
}
.hud-toast.is-visible { opacity: 1; transform: translate(-50%, 0); }
.hud-toast.is-error { border-color: var(--danger); color: var(--danger); }

/* ----------------------------------------------------------------------------
   Accessibility
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .boot-bus, .rotate-hint span { animation: none; }
  .boot, .boot-bar, .hud-toast { transition: none; }
}