/* =========================================================================
   style.css -- Hide & Seek 2.0 viewer UI.

   DARK is the default theme; a light/dark toggle in the top bar flips
   document.documentElement[data-theme]. ALL colors are CSS custom properties
   defined per-theme under [data-theme="dark"] / [data-theme="light"] so the
   whole DOM restyles instantly (viewer.js also mirrors these onto the root as
   inline vars when applying a theme, and drives the matching Three.js scene
   palette). The 3D scene lives on a full-bleed WebGL canvas; everything here is
   the frosted-glass HUD that floats over it.

   LIGHT == the original bright "OpenAI Emergent Tool Use" studio look.
   DARK  == a moody-but-clean dark studio.

   Font: Inter (Google Fonts) with a graceful system-ui fallback.
   ========================================================================= */

/* ---- shared tokens (theme-independent) --------------------------------- */
:root {
  --radius: 14px;
  --radius-sm: 9px;
  --radius-lg: 18px;
  --blur: blur(16px) saturate(140%);
  --font: Inter, system-ui, -apple-system, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, sans-serif;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);

  /* sensible dark defaults so first paint (before JS) is already dark */
  --bg: #0b0f17;
  --text: #dbe5f3;
}

/* ===================== DARK THEME (default) ============================== */
[data-theme="dark"] {
  --bg:           #0b0f17;
  --panel:        rgba(18, 24, 36, 0.74);
  --panel-solid:  rgba(16, 21, 32, 0.96);
  --panel-border: rgba(120, 150, 200, 0.14);
  --panel-hover:  rgba(28, 36, 52, 0.86);

  --text:   #dbe5f3;
  --muted:  #8a98ad;
  --accent: #5b9dff;
  --accent-strong: #4a86f0;

  --hider:     #43b6ff;
  --seeker:    #ff6b6b;
  --box_light: #f5b73e;
  --box_heavy: #ef9a2b;
  --ramp:      #a78bfa;
  --decoy:     #c77dff;
  --wall:      #2b3446;
  --door:      #56c7e6;
  --spotted:   #ffd24a;

  --amber: #f5b73e;
  --red:   #ff6b6b;

  --chip-line: rgba(120, 150, 200, 0.20);
  --zebra:     rgba(255, 255, 255, 0.025);
  --shadow:    0 14px 38px rgba(0, 0, 0, 0.45);
  --scrim:     rgba(8, 11, 18, 0.66);
  --cap-text:  #e7eefb;
  --cap-halo:  rgba(8, 12, 20, 0.85);
  --track:     rgba(255, 255, 255, 0.08);

  --vignette: rgba(120, 150, 210, 0.05);
  color-scheme: dark;
}

/* ===================== LIGHT THEME ====================================== */
[data-theme="light"] {
  --bg:           #e7edf3;
  --panel:        rgba(255, 255, 255, 0.72);
  --panel-solid:  rgba(255, 255, 255, 0.94);
  --panel-border: rgba(15, 30, 55, 0.08);
  --panel-hover:  rgba(255, 255, 255, 0.92);

  --text:   #1f2733;
  --muted:  #6c7785;
  --accent: #2f6bff;
  --accent-strong: #2a60e6;

  --hider:     #2f9be8;
  --seeker:    #f2604d;
  --box_light: #f2b441;
  --box_heavy: #e89a2b;
  --ramp:      #b9a98f;
  --decoy:     #8b5cf6;
  --wall:      #9aa6b4;
  --door:      #6fa0cf;
  --spotted:   #f59e2e;

  --amber: #f2b441;
  --red:   #f2604d;

  --chip-line: rgba(15, 30, 55, 0.10);
  --zebra:     rgba(15, 30, 55, 0.025);
  --shadow:    0 10px 30px rgba(31, 45, 70, 0.12);
  --scrim:     rgba(231, 237, 243, 0.7);
  --cap-text:  #2a3340;
  --cap-halo:  rgba(255, 255, 255, 0.85);
  --track:     rgba(15, 30, 55, 0.10);

  --vignette: rgba(255, 255, 255, 0.35);
  color-scheme: light;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* A short global color transition so the light/dark flip feels smooth. */
html.theme-anim,
html.theme-anim .glass,
html.theme-anim .btn,
html.theme-anim .icon-btn,
html.theme-anim .tab,
html.theme-anim body { transition: background-color 0.32s ease, color 0.32s ease, border-color 0.32s ease; }

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

#canvas-host { position: absolute; inset: 0; transition: opacity 0.3s ease, filter 0.3s ease; }
#canvas-host canvas { display: block; }

/* When a non-Watch tab is active, dim + hide the live 3D canvas. */
body[data-tab]:not([data-tab="watch"]) #canvas-host { opacity: 0; pointer-events: none; }

/* A very faint top-light vignette to lift the scene -- purely cosmetic. */
#app::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(130% 90% at 50% 8%, var(--vignette) 0%, transparent 45%);
  z-index: 1;
}

/* ---- shared frosted glass surface --------------------------------------- */
.glass {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
}

.overlay { position: absolute; z-index: 5; pointer-events: none; }
.overlay > * { pointer-events: auto; }

/* Hide the watch-only overlays on every non-Watch tab (Train / Learning / About). */
body[data-tab]:not([data-tab="watch"]) .watch-only { display: none !important; }

/* ---- boot / tab enter animations --------------------------------------- */
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

body.booting #hud-top      { animation: fadeUp 0.5s var(--ease) both; }
body.booting #panel-left   { animation: fadeUp 0.55s 0.05s var(--ease) both; }
body.booting #transport    { animation: fadeUp 0.55s 0.08s var(--ease) both; }
body.booting #scenario-caption { animation: fadeUp 0.6s 0.12s var(--ease) both; }

/* ========================================================================= */
/* TOP HUD BAR                                                               */
/* ========================================================================= */
#hud-top {
  top: 14px;
  left: 14px;
  right: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 14px;
}

.hud-title {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  margin-right: 2px;
}
.hud-title .t1 {
  font-weight: 700;
  letter-spacing: 0.2px;
  font-size: 13px;
  color: var(--text);
}
.hud-title .t2 {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 1.4px;
  text-transform: uppercase;
}

.hud-spacer { flex: 1 1 auto; }

/* ---- tab bar ----------------------------------------------------------- */
.tab-bar {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border-radius: 999px;
  background: var(--track);
  border: 1px solid var(--panel-border);
  margin-left: 6px;
}
.tab {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2px;
  padding: 6px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.18s ease, background 0.18s ease;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
}
[data-theme="light"] .tab.active { color: #fff; }

/* phase pill ------------------------------------------------------------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 1.4px;
  font-weight: 600;
  text-transform: uppercase;
  border: 1px solid transparent;
  transition: all 0.25s ease;
}
.pill .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 6px currentColor;
}
.pill.prep {
  color: var(--amber);
  background: color-mix(in srgb, var(--amber) 16%, transparent);
  border-color: color-mix(in srgb, var(--amber) 45%, transparent);
}
.pill.main {
  color: var(--red);
  background: color-mix(in srgb, var(--red) 14%, transparent);
  border-color: color-mix(in srgb, var(--red) 42%, transparent);
}

/* score block ------------------------------------------------------------ */
.scores {
  display: flex;
  align-items: stretch;
  gap: 0;
  font-variant-numeric: tabular-nums;
}
.score {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2px 14px;
  min-width: 56px;
}
.score .lbl {
  font-size: 9px; letter-spacing: 1.4px; text-transform: uppercase;
  color: var(--muted);
}
.score .val { font-size: 17px; font-weight: 700; display: inline-block; }
.score.hiders .val { color: var(--hider); }
.score.seekers .val { color: var(--seeker); }
.score .vs { color: var(--muted); align-self: center; font-size: 11px; }

/* number "pop" when a score changes */
@keyframes scoreBump { 0% { transform: scale(1); } 35% { transform: scale(1.28); } 100% { transform: scale(1); } }
.score .val.bump { animation: scoreBump 0.4s var(--ease); }

/* step counter ----------------------------------------------------------- */
.step-counter {
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--text);
  padding: 0 4px;
}
.step-counter .max { color: var(--muted); }

/* spotted indicator ------------------------------------------------------ */
.spotted-ind {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted);
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  transition: all 0.2s ease;
}
.spotted-ind .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--muted);
  transition: all 0.2s ease;
}
.spotted-ind.live {
  color: var(--spotted);
  border-color: color-mix(in srgb, var(--spotted) 55%, transparent);
  background: color-mix(in srgb, var(--spotted) 14%, transparent);
}
.spotted-ind.live .dot {
  background: var(--spotted);
  box-shadow: 0 0 9px var(--spotted);
  animation: pulse 1.1s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.45; transform: scale(0.78); }
}

/* scenario picker -------------------------------------------------------- */
.scenario-select {
  font: inherit;
  font-size: 12px;
  color: var(--text);
  background: var(--track);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  padding: 5px 9px;
  cursor: pointer;
  outline: none;
  max-width: 190px;
  transition: border-color 0.15s ease;
}
.scenario-select:hover { border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.scenario-select option { color: #1f2733; } /* native dropdown stays readable */

/* theme toggle ----------------------------------------------------------- */
.theme-toggle {
  width: 32px; height: 30px;
  padding: 0;
  justify-content: center;
}
.theme-ic { display: inline-flex; }
.theme-toggle svg { width: 16px; height: 16px; }

/* ========================================================================= */
/* LEFT CONTROL PANEL (collapsible)                                          */
/* ========================================================================= */
#panel-left {
  top: 76px;
  left: 14px;
  width: 226px;
  max-height: calc(100vh - 168px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.28s var(--ease), opacity 0.28s ease;
}
#panel-left.collapsed {
  transform: translateX(calc(-100% - 18px));
  opacity: 0;
  pointer-events: none;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 14px;
  border-bottom: 1px solid var(--panel-border);
  font-size: 10px;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--muted);
}

.panel-body {
  overflow-y: auto;
  padding: 12px 14px 14px;
}
.panel-body::-webkit-scrollbar { width: 8px; }
.panel-body::-webkit-scrollbar-thumb {
  background: var(--chip-line); border-radius: 8px;
}

.panel-section + .panel-section { margin-top: 16px; }
.panel-section .sec-title {
  font-size: 9px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

/* legend ----------------------------------------------------------------- */
.legend { display: flex; flex-direction: column; gap: 6px; }
.legend-row {
  display: flex; align-items: center; gap: 9px;
  font-size: 11px; color: var(--text);
}
.swatch {
  width: 11px; height: 11px; border-radius: 3px;
  flex: none;
  box-shadow: 0 0 0 1px var(--chip-line);
}

/* toggles ---------------------------------------------------------------- */
.toggle {
  display: flex; align-items: center; gap: 9px;
  padding: 4px 0;
  font-size: 11.5px;
  cursor: pointer;
  user-select: none;
  color: var(--text);
}
.toggle input { display: none; }
.toggle .box {
  width: 15px; height: 15px;
  border-radius: 4px;
  border: 1px solid var(--chip-line);
  background: var(--track);
  position: relative;
  flex: none;
  transition: all 0.18s ease;
}
.toggle input:checked + .box {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.toggle input:checked + .box::after {
  content: "";
  position: absolute;
  left: 4px; top: 1px;
  width: 4px; height: 8px;
  border: solid #ffffff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.toggle:hover .box { border-color: color-mix(in srgb, var(--accent) 50%, transparent); }

/* ========================================================================= */
/* INSPECTOR (hover/click tooltip panel)                                     */
/* ========================================================================= */
#inspector {
  top: 76px;
  right: 14px;
  width: 212px;
  padding: 12px 14px;
  font-size: 11.5px;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
#inspector[hidden] { display: none; }
.insp-head {
  display: flex; align-items: center; gap: 8px;
  padding-bottom: 8px; margin-bottom: 8px;
  border-bottom: 1px solid var(--panel-border);
}
.insp-head .swatch { width: 12px; height: 12px; }
.insp-head .insp-type {
  font-weight: 700; letter-spacing: 0.2px; text-transform: capitalize;
}
.insp-row {
  display: flex; justify-content: space-between;
  padding: 2px 0;
  font-variant-numeric: tabular-nums;
}
.insp-row .k { color: var(--muted); }
.insp-row .v { color: var(--text); }
.insp-row .v.flag-on { color: var(--accent); font-weight: 600; }
.insp-row .v.flag-off { color: var(--muted); }
.insp-row .v.decoy-true { color: var(--decoy); font-weight: 700; }

/* tiny stamina bar inside inspector */
.stamina-bar {
  height: 5px; border-radius: 3px;
  background: var(--track);
  overflow: hidden; width: 70px; align-self: center;
}
.stamina-bar > i {
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--seeker), var(--amber), var(--hider));
}

/* ========================================================================= */
/* BOTTOM-CENTER SCENARIO CAPTION                                            */
/* ========================================================================= */
#scenario-caption {
  position: absolute;
  bottom: 104px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  text-align: center;
  max-width: min(880px, calc(100vw - 40px));
}
#scenario-caption .cap-title {
  font-size: 31px;
  font-weight: 600;
  letter-spacing: 0.2px;
  color: var(--cap-text);
  line-height: 1.15;
  /* soft halo so it reads over the scene (theme-aware) */
  text-shadow:
    0 1px 0 var(--cap-halo),
    0 0 16px var(--cap-halo),
    0 2px 22px var(--cap-halo);
}
#scenario-caption .cap-sub {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--muted);
  text-shadow: 0 1px 10px var(--cap-halo);
}

/* ========================================================================= */
/* BOTTOM TRANSPORT BAR                                                      */
/* ========================================================================= */
#transport {
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: min(880px, calc(100vw - 28px));
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 12px 16px 13px;
}

.transport-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* play / step buttons ---------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  min-width: 34px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--panel-border);
  background: var(--track);
  color: var(--text);
  font-family: var(--font);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}
.btn:hover {
  background: var(--panel-hover);
  border-color: color-mix(in srgb, var(--accent) 30%, var(--panel-border));
}
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  width: 42px;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 30%, transparent);
}
.btn.primary:hover { background: var(--accent-strong); }
.btn.active {
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  color: var(--accent);
}
.btn svg { width: 15px; height: 15px; fill: currentColor; }

/* speed selector --------------------------------------------------------- */
.speed-group {
  display: inline-flex;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--track);
}
.speed-group button {
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 600;
  padding: 0 10px;
  height: 32px;
  cursor: pointer;
  transition: all 0.12s ease;
}
.speed-group button + button { border-left: 1px solid var(--panel-border); }
.speed-group button:hover { color: var(--text); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.speed-group button.active {
  color: #ffffff;
  background: var(--accent);
}

.frame-readout {
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--muted);
  margin-left: auto;
  white-space: nowrap;
}
.frame-readout b { color: var(--text); font-weight: 600; }

/* timeline scrubber ------------------------------------------------------ */
.scrubber-wrap {
  position: relative;
  flex: 1 1 auto;
  height: 22px;
  display: flex;
  align-items: center;
}
.scrubber-track {
  position: absolute;
  left: 0; right: 0;
  height: 5px;
  border-radius: 3px;
  background: var(--track);
  overflow: visible;
  pointer-events: none;
}
.scrubber-fill {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  border-radius: 3px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 55%, transparent), var(--accent));
  width: 0%;
}
/* phase-boundary tick at prep_steps */
.scrubber-tick {
  position: absolute;
  top: -4px; bottom: -4px;
  width: 2px;
  background: var(--amber);
  box-shadow: 0 0 6px color-mix(in srgb, var(--amber) 70%, transparent);
  border-radius: 2px;
  transform: translateX(-50%);
}
.scrubber-tick::after {
  content: "PREP";
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 8px;
  letter-spacing: 1px;
  color: var(--amber);
  opacity: 0.9;
}
/* the actual range input, transparent, on top */
input.scrubber {
  -webkit-appearance: none;
  appearance: none;
  position: relative;
  width: 100%;
  height: 22px;
  background: transparent;
  cursor: pointer;
  margin: 0;
  z-index: 2;
}
input.scrubber::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--panel-solid);
  border: 2px solid var(--accent);
  box-shadow: 0 1px 6px color-mix(in srgb, var(--accent) 45%, transparent);
  cursor: grab;
}
input.scrubber::-moz-range-thumb {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--panel-solid);
  border: 2px solid var(--accent);
  box-shadow: 0 1px 6px color-mix(in srgb, var(--accent) 45%, transparent);
  cursor: grab;
}
input.scrubber::-moz-range-track { background: transparent; }

/* ========================================================================= */
/* FILE DROP / PICKER                                                         */
/* ========================================================================= */
#drop-hint {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--scrim);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}
#drop-hint.show { display: flex; }
#drop-hint .drop-card {
  padding: 40px 56px;
  border: 2px dashed color-mix(in srgb, var(--accent) 50%, transparent);
  border-radius: 16px;
  text-align: center;
  color: var(--accent);
  letter-spacing: 0.5px;
  font-size: 14px;
  font-weight: 600;
  background: var(--panel-solid);
  box-shadow: var(--shadow);
}
#drop-hint .drop-card small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  letter-spacing: 0.3px;
  font-size: 11px;
  font-weight: 400;
}

/* the "Load file" button in the HUD */
.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 11px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--panel-border);
  background: var(--track);
  color: var(--text);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}
.icon-btn:hover {
  background: var(--panel-hover);
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
  color: var(--accent);
}
.icon-btn svg { width: 13px; height: 13px; fill: currentColor; }

/* hamburger toggle for the left panel */
.panel-toggle {
  width: 30px; height: 30px;
  padding: 0;
  display: inline-flex; align-items: center; justify-content: center;
}
.panel-toggle svg { width: 15px; height: 15px; fill: currentColor; }

/* ========================================================================= */
/* TOAST (transient status: loaded X, error Y)                              */
/* ========================================================================= */
#toast {
  position: absolute;
  bottom: 150px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  z-index: 30;
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.2px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  max-width: 70vw;
  text-align: center;
  color: var(--text);
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
#toast.ok    { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
#toast.warn  { color: var(--amber);  border-color: color-mix(in srgb, var(--amber) 45%, transparent); }
#toast.err   { color: var(--red);    border-color: color-mix(in srgb, var(--red) 45%, transparent); }
#toast.ev    { color: var(--text);   border-color: color-mix(in srgb, var(--accent) 35%, transparent); }

/* ========================================================================= */
/* TAB PANELS (Learning / About) -- full-screen scrollable overlays         */
/* ========================================================================= */
.tab-panel {
  position: absolute;
  inset: 64px 0 0 0;          /* sit just below the top bar */
  z-index: 6;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.26s ease, transform 0.26s ease;
}
.tab-panel[hidden] { display: none; }
.tab-panel.shown { opacity: 1; transform: none; }

.tab-scroll {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  padding: 22px 22px 64px;
  display: flex;
  justify-content: center;
}
.tab-scroll::-webkit-scrollbar { width: 10px; }
.tab-scroll::-webkit-scrollbar-thumb { background: var(--chip-line); border-radius: 8px; }

/* ---- Learning dashboard ------------------------------------------------ */
.learning-root { width: 100%; max-width: 960px; }
.learn-wrap { display: flex; flex-direction: column; gap: 22px; }

.learn-error {
  margin: 40px auto; max-width: 480px;
  padding: 20px 24px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--panel-border);
  color: var(--text); line-height: 1.6;
}
.learn-error code {
  color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 1px 5px; border-radius: 4px;
}

.learn-intro { }
.learn-h {
  margin: 0 0 8px; font-size: 22px; font-weight: 700; letter-spacing: 0.2px;
  color: var(--text);
}
.learn-lead {
  margin: 0; font-size: 14px; line-height: 1.6; color: var(--text);
  max-width: 72ch;
}
.learn-note {
  margin: 8px 0 0; font-size: 12px; line-height: 1.5; color: var(--muted);
  max-width: 72ch;
}

/* team skill cards */
.learn-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.team-card {
  --team: var(--accent);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
  position: relative;
  overflow: hidden;
}
.team-card::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--team);
}
.tc-head { display: flex; align-items: center; gap: 8px; }
.tc-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--team); box-shadow: 0 0 8px var(--team);
}
.tc-name { font-weight: 700; font-size: 14px; color: var(--text); }
.tc-elo-lbl {
  margin-left: auto; font-size: 9px; letter-spacing: 1.6px;
  text-transform: uppercase; color: var(--muted);
}
.tc-elo {
  font-size: 38px; font-weight: 800; line-height: 1.1; color: var(--team);
  font-variant-numeric: tabular-nums; margin: 4px 0 10px;
}
.tc-bar {
  position: relative;
  height: 10px; border-radius: 6px;
  background: var(--track);
  overflow: hidden;
}
.tc-bar-fill {
  display: block; height: 100%; width: 0%;
  border-radius: 6px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--team) 55%, transparent), var(--team));
  transition: width 0.2s linear;
}
.tc-bar-pct {
  position: absolute; right: 8px; top: -1px;
  font-size: 8px; font-weight: 700; line-height: 12px;
  color: var(--text); opacity: 0.7;
}
.tc-meta { margin-top: 9px; font-size: 12px; color: var(--muted); }
.tc-wr b { color: var(--text); font-variant-numeric: tabular-nums; }
.tc-tactic {
  margin-top: 8px; font-size: 12.5px; font-style: italic;
  color: var(--text); opacity: 0.85; line-height: 1.4;
}

/* sections */
.learn-section {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px 18px;
}
.learn-h3 { margin: 0 0 3px; font-size: 15px; font-weight: 700; color: var(--text); }
.learn-sub { margin: 0 0 12px; font-size: 12px; color: var(--muted); line-height: 1.5; }

.chart-holder { width: 100%; }
.chart-holder canvas { display: block; width: 100%; }

/* milestone table */
.learn-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
}
.learn-table thead th {
  text-align: left;
  font-size: 9.5px; letter-spacing: 1.4px; text-transform: uppercase;
  color: var(--muted); font-weight: 700;
  padding: 6px 10px; border-bottom: 1px solid var(--panel-border);
  white-space: nowrap;
}
.learn-table tbody td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--panel-border);
  color: var(--text); vertical-align: top; line-height: 1.45;
}
.learn-table tbody tr:nth-child(odd) { background: var(--zebra); }
.learn-table tbody tr:last-child td { border-bottom: none; }
.learn-table .col-num { width: 28px; color: var(--muted); font-variant-numeric: tabular-nums; }
.learn-table .col-when { width: 84px; font-variant-numeric: tabular-nums; color: var(--muted); white-space: nowrap; }
.learn-table .col-team { width: 92px; }
.learn-table .col-beh { width: 200px; font-weight: 600; }
.learn-table .beh-emoji { margin-right: 5px; }

.team-chip {
  display: inline-block;
  padding: 2px 9px; border-radius: 999px;
  font-size: 10.5px; font-weight: 700; letter-spacing: 0.2px;
  border: 1px solid transparent;
}
.chip-hider {
  color: var(--hider);
  background: color-mix(in srgb, var(--hider) 16%, transparent);
  border-color: color-mix(in srgb, var(--hider) 40%, transparent);
}
.chip-seeker {
  color: var(--seeker);
  background: color-mix(in srgb, var(--seeker) 16%, transparent);
  border-color: color-mix(in srgb, var(--seeker) 40%, transparent);
}

/* ---- About tab --------------------------------------------------------- */
.about-wrap { width: 100%; max-width: 760px; }
.about-title {
  margin: 0 0 14px; font-size: 30px; font-weight: 800; letter-spacing: -0.2px;
  color: var(--text); display: flex; align-items: center; gap: 12px;
}
.about-badge {
  font-size: 13px; font-weight: 700; letter-spacing: 0.5px;
  color: #fff; background: var(--accent);
  padding: 4px 10px; border-radius: 999px;
}
.about-lead {
  margin: 0 0 14px; font-size: 14.5px; line-height: 1.65; color: var(--text);
}
.about-lead-sub { color: var(--muted); }
.about-lead .c-hider { color: var(--hider); }
.about-lead .c-seeker { color: var(--seeker); }
.about-h2 {
  margin: 26px 0 12px; font-size: 16px; font-weight: 700; color: var(--text);
}
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
}
.about-card {
  background: var(--panel); border: 1px solid var(--panel-border);
  border-radius: var(--radius); padding: 14px 16px;
}
.about-ic { font-size: 22px; line-height: 1; margin-bottom: 8px; }
.about-card-t { font-weight: 700; font-size: 13.5px; margin-bottom: 4px; color: var(--text); }
.about-card-d { font-size: 12.5px; line-height: 1.5; color: var(--muted); }

.about-links { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.about-link {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: var(--radius-sm);
  background: var(--track); border: 1px solid var(--panel-border);
  color: var(--text); text-decoration: none; font-weight: 600; font-size: 13px;
  transition: all 0.15s ease;
}
.about-link:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  color: var(--accent);
  background: var(--panel-hover);
}
.about-link svg { color: currentColor; }

/* ========================================================================= */
/* BOOT ERROR (no CDN / no module support)                                  */
/* ========================================================================= */
.boot-error {
  position: absolute;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}
.boot-error[hidden] { display: none; }
.boot-error__card {
  max-width: 480px;
  margin: 24px;
  padding: 28px 30px;
  border-radius: var(--radius);
  background: var(--panel-solid);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
}
.boot-error__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--red);
  letter-spacing: 0.2px;
  margin-bottom: 10px;
}
.boot-error__msg { color: var(--text); margin-bottom: 12px; line-height: 1.5; }
.boot-error__hint { color: var(--muted); font-size: 11.5px; line-height: 1.6; }
.boot-error__hint code {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  padding: 1px 5px;
  border-radius: 4px;
}

/* ---- responsive trims ---------------------------------------------------- */
@media (max-width: 900px) {
  .learn-cards { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  #panel-left { width: 200px; }
  .scores .score { min-width: 46px; padding: 2px 8px; }
  .hud-title .t2 { display: none; }
  #inspector { width: 180px; }
  #scenario-caption .cap-title { font-size: 24px; }
  .tab { padding: 6px 11px; }
  .learn-table .col-beh { width: auto; }
}

/* ---- reduced motion ------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  body.booting #hud-top,
  body.booting #panel-left,
  body.booting #transport,
  body.booting #scenario-caption { animation: none !important; }
  .tab-panel { transition: none; }
  #canvas-host { transition: none; }
  .score .val.bump { animation: none; }
  html.theme-anim, html.theme-anim * { transition: none !important; }
  .spotted-ind.live .dot { animation: none; }
}

/* ===== Train tab — live in-browser self-play RL ===== */
.train-wrap { max-width: 1020px; margin: 0 auto; }
.train-wrap h2 { font-size: 22px; margin: 2px 0 6px; }
.train-intro { color: var(--muted); max-width: 70ch; margin: 0 0 16px; line-height: 1.55; }
.train-controls { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.train-controls .tr-speed { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; }
.train-controls .tr-stat { color: var(--muted); font: 600 13px ui-monospace, monospace; margin-left: auto; }
.train-grid { display: grid; grid-template-columns: minmax(300px, 400px) 1fr; gap: 16px; align-items: start; }
.train-card { background: var(--panel); border: 1px solid var(--panel-border); border-radius: 14px; padding: 14px; }
.train-card .tc-title { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.train-card canvas { width: 100%; height: auto; display: block; border-radius: 8px; background: #0c111b; }
.tr-status { margin-top: 10px; font: 600 14px ui-monospace, monospace; color: var(--text); text-align: center; }
.tr-legend { display: flex; gap: 18px; margin-top: 12px; color: var(--muted); font-size: 12px; }
.tr-legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
@media (max-width: 860px) { .train-grid { grid-template-columns: 1fr; } }