:root {
  color-scheme: light;
  font-family: Inter, system-ui, Arial, sans-serif;
  --host-header-space: 15svh;          /* matches the hosting site's top banner */
  --game-h: calc(100svh - var(--host-header-space));
}

body {
  margin: 0;
  background: radial-gradient(circle at top, #e9f2ff, #eef2f7 45%, #f7f8fb);
  color: #14213d;
}

body.phase2-mode {
  background: radial-gradient(circle at top, #fff2e6, #f8eee4 45%, #f6f2ec);
}

.app {
  max-width: 980px;
  margin: 0 auto;
  height: var(--game-h);
  padding: calc(env(safe-area-inset-top) + 0.3rem) 0.45rem calc(env(safe-area-inset-bottom) + 0.3rem);
  overflow-x: hidden;
  overflow-y: auto;   /* setup screen scrolls when rules open; game manages its own overflow */
  box-sizing: border-box;
}

.panel {
  background: #fff;
  border-radius: 12px;
  padding: 0.5rem;
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.07);
  margin-bottom: 0.35rem;
}

.hero {
  text-align: center;
  padding: 0.4rem;
}

.hero h1 { margin: 0; font-size: 1rem; }
.hidden { display: none; }
/* Override: ID-level rule for #game would beat .hidden without this */
#game.hidden { display: none; }

/* ── Game grid: mobile-first vertical stack ── */
#game {
  display: grid;
  gap: 0.35rem;
  grid-template-rows: auto auto 1fr auto auto;  /* scoreboard | info | board | ai-banner | controls */
  height: 100%;
  overflow: hidden;
}

#game.phase2 .board {
  box-shadow: 0 0 0 3px rgba(230, 125, 30, 0.5);
  border-radius: 12px;
  padding: 4px;
}

select,
button {
  border-radius: 10px;
  border: 1px solid #c6ced8;
  padding: 0.45rem 0.6rem;
  font: inherit;
}

button {
  cursor: pointer;
  background: linear-gradient(180deg, #2e89ff, #0a6cff);
  color: #fff;
  border: none;
}

button:disabled { opacity: 0.45; cursor: not-allowed; }

/* ── Scoreboard ── */
.scoreboard {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0;
  position: sticky;
  top: 0;
  z-index: 4;
}

.score-pill {
  border-radius: 12px;
  padding: 0.3rem 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  gap: 0.45rem;
}

.score-pill strong { font-size: 1.15rem; line-height: 1; min-width: 1.7rem; text-align: right; }
.player-pill { background: #dcecff; color: #0f4fa8; }
.ai-pill { background: #ffe0e0; color: #972323; }
.score-center { grid-column: 1 / -1; display: flex; justify-content: space-around; gap: 0.3rem; text-align: center; font-size: 0.74rem; white-space: nowrap; }
.score-center p { margin: 0.05rem 0; }

/* Personality label shown inside the AI score pill */
.ai-pill-personality {
  display: block;
  font-size: 0.6rem;
  font-weight: 600;
  opacity: 0.75;
  line-height: 1.3;
  white-space: nowrap;
}

/* ── Card + guide row (mobile: side by side) ── */
.compact-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.3rem;
  align-items: stretch;
}

.card-panel h2,
.legend-panel h2 {
  margin: 0 0 0.12rem;
  font-size: 0.8rem;
}

.guide-row {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.guide-item {
  display: inline-flex;
  align-items: center;
  gap: 0.22rem;
  font-size: 0.68rem;
  font-weight: 700;
}

.swatch {
  width: 1rem;
  height: 1rem;
  border-radius: 4px;
  display: inline-grid;
  place-items: center;
  border: 2px solid #cad5e3;
  color: #12213f;
  font-size: 0.65rem;
  font-weight: 800;
  flex: 0 0 auto;
}

.swatch.legal { background: rgba(22, 173, 116, 0.25); border-color: #16ad74; }
.swatch.legal::before { content: "✓"; color: #0f8b5f; }
.swatch.illegal { background: rgba(255, 77, 79, 0.25); border-color: #ff4d4f; }
.swatch.illegal::before { content: "✕"; color: #c42022; }
.swatch.ai { background: rgba(255, 159, 28, 0.25); border-color: #ff9f1c; }
.swatch.ai::before { content: "•"; color: #9c5f00; font-size: 0.95rem; line-height: 0.5; }

/* ── Board ──
   --cell-size is the binding constraint:
   · Width formula:  (viewport − horizontal padding) ÷ 7.6
   · Height formula: (game height − fixed panel budget) ÷ 7.4
   · Hard cap for large screens
   The min() ensures the board never overflows in either axis.
   Height formula derivation (mobile, measured at 664px viewport):
     overhead = scoreboard(83) + top-controls(94) + dock(90) +
                grid-gaps(17) + app-padding(10) + board-internal-gaps(24) = 318px
     cell = (game-h − 318px) / 7
   Width formula: (viewport − h-padding) / 7.6 (accounts for 6 inter-cell gaps)
*/
.board {
  --cell-size: min(
    calc((100vw - 1rem) / 7.6),
    calc((var(--game-h) - 318px) / 7),
    58px
  );
  display: grid;
  grid-template-columns: repeat(7, var(--cell-size));
  grid-template-rows: repeat(7, var(--cell-size));
  gap: 4px;
  width: fit-content;
  margin: 0 auto;
  user-select: none;
  touch-action: manipulation;
}

.cell {
  padding: 0;            /* override button { padding: 0.45rem 0.6rem } */
  border-radius: 8px;
  border: 2px solid #cad5e3;
  background: #fff;
  position: relative;
}

.cell.player { background: #2467c8; border-color: #0f4fa8; }
.cell.ai { background: #d14545; border-color: #972323; }

.cell.ghost-player::before,
.cell.ghost-ai::before {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 6px;
  pointer-events: none;
}

.cell.ghost-player::before {
  background: rgba(112, 189, 255, 0.72);
  box-shadow: inset 0 0 0 2px rgba(8, 64, 143, 0.9);
}

.cell.ghost-ai::before {
  background: rgba(255, 133, 133, 0.72);
  box-shadow: inset 0 0 0 2px rgba(145, 28, 28, 0.9);
}

.cell.ai-intent { outline: 3px solid #ff9f1c; outline-offset: -3px; }

.cell.ghost-legal { box-shadow: inset 0 0 0 3px #16ad74; }
.cell.ghost-legal::after {
  content: "✓";
  position: absolute;
  right: 2px;
  bottom: 0;
  color: #0a7f55;
  font-size: 0.82rem;
  font-weight: 900;
}

.cell.ghost-illegal { box-shadow: inset 0 0 0 3px #ff4d4f; }
.cell.ghost-illegal::after {
  content: "✕";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #b90000;
  font-size: 1rem;
  font-weight: bold;
  background: repeating-linear-gradient(45deg, rgba(255, 77, 79, 0.14), rgba(255, 77, 79, 0.14) 4px, transparent 4px, transparent 8px);
}

.ai-banner {
  text-align: center;
  color: #9a5a00;
  font-weight: 700;
  margin: 0;
  font-size: 0.8rem;
}

/* Card preview: 12px cells keep it compact while remaining readable */
.card-preview {
  display: grid;
  grid-template-columns: repeat(4, 12px);
  grid-template-rows: repeat(4, 12px);
  gap: 2px;
  margin: 0;
  min-height: 50px;
  align-content: start;
}

.card-preview div { border-radius: 4px; background: #e7ecf2; border: 1px solid #ccd6e6; }
.card-preview .filled { background: #3f8cff; border-color: #1a67d1; }

/* Controls dock — horizontal layout keeps height to ~95px on all sizes */
.controls-dock {
  position: static;
  background: rgba(255, 255, 255, 0.97);
  padding: 0.4rem 0.6rem;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
}

/* Action buttons: stacked column on the left */
.dock-main-actions {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin: 0;
  width: 110px;
  flex-shrink: 0;
}

.dock-main-actions button,
.dpad-grid button {
  min-height: 38px;
  width: 100%;
  font-weight: 700;
  display: grid;
  place-items: center;
}

/* D-pad: 3×2 grid to the right of the action buttons */
.dpad-grid {
  display: grid;
  grid-template-columns: repeat(3, 40px);
  gap: 0.3rem;
  margin: 0;
  flex-shrink: 0;
}

#move-up    { grid-column: 2; }
#move-left  { grid-column: 1; grid-row: 2; }
#move-down  { grid-column: 2; grid-row: 2; }
#move-right { grid-column: 3; grid-row: 2; }


/* ═══════════════════════════════════════════════════════════
   WIDE LAYOUT — tablet portrait, tablet landscape, desktop
   Triggers at ≥600px wide AND ≥500px tall.
   Landscape phones (short) are handled separately below.
   ═══════════════════════════════════════════════════════════ */
@media (min-width: 600px) and (min-height: 500px) {

  #game {
    grid-template-columns: 165px 1fr;
    grid-template-rows: auto 1fr auto auto;
    align-items: start;
    gap: 0.45rem;
  }

  /* Scoreboard: full width across both columns */
  .scoreboard {
    grid-column: 1 / -1;
    grid-row: 1;
  }

  /* Left sidebar: card preview + guide, stacked vertically */
  .top-controls {
    grid-column: 1;
    grid-row: 2 / 4;          /* spans board row + ai-banner row */
    display: flex !important; /* override .compact-row grid */
    flex-direction: column;
    gap: 0.35rem;
    align-self: start;
  }

  .top-controls .panel {
    margin-bottom: 0;         /* gap handles spacing instead */
  }

  /* Board: right column, main row */
  #board {
    grid-column: 2;
    grid-row: 2;
    margin: 0 auto;
  }

  /* AI banner: right column, below board */
  #ai-banner {
    grid-column: 2;
    grid-row: 3;
  }

  /* Controls: full-width bar at bottom */
  .controls-dock {
    grid-column: 1 / -1;
    grid-row: 4;
    gap: 2.5rem;
  }

  /* Wider action buttons on tablet/PC */
  .dock-main-actions {
    width: 140px;
  }

  /* Board cells (wide layout):
     overhead = scoreboard(83) + controls(90) + gaps(22) + app-pad(10) + board-gaps(24) = 229px
     Height formula: (game-h − 229px) / 7
     Width formula: right-column width ÷ 7.6 */
  .board {
    --cell-size: min(
      calc((100vw - 165px - 1.5rem) / 7.6),
      calc((var(--game-h) - 229px) / 7),
      68px
    );
  }
}


/* ═══════════════════════════════════════════════════════════
   LANDSCAPE PHONE — short viewport (≤500px tall) in landscape
   Board goes left, sidebar (card + guide + controls) goes right.
   ═══════════════════════════════════════════════════════════ */
@media (orientation: landscape) and (max-height: 500px) {

  #game {
    grid-template-columns: 1fr 170px;
    grid-template-rows: auto 1fr auto;  /* row 3 = controls dock */
    gap: 0.3rem;
    align-items: start;
  }

  /* Compact scoreboard — drop the 3rd center-info row */
  .scoreboard {
    grid-column: 1 / -1;
    grid-row: 1;
    grid-template-columns: 1fr 1fr; /* just the two pills */
  }
  .score-center { display: none; }

  /* Board fills the left column, spanning both content rows */
  #board {
    grid-column: 1;
    grid-row: 2 / 4;
    margin: 0;
  }

  /* No room for the AI banner in landscape */
  #ai-banner { display: none; }

  /* Card + guide: right column, top */
  .top-controls {
    grid-column: 2;
    grid-row: 2;
    display: flex !important;
    flex-direction: column;
    gap: 0.25rem;
    align-self: start;
  }

  .top-controls .panel { margin-bottom: 0; padding: 0.3rem; }

  /* Controls dock: right column, explicit row 3 */
  .controls-dock {
    grid-column: 2;
    grid-row: 3;
    padding: 0.3rem;
    margin-bottom: 0;
  }

  .controls-dock { gap: 0.6rem; padding: 0.25rem; }
  .dock-main-actions { width: 80px; gap: 0.2rem; }
  .dock-main-actions button,
  .dpad-grid button { min-height: 30px; font-size: 0.75rem; }
  .dpad-grid { grid-template-columns: repeat(3, 30px); gap: 0.2rem; }

  /* Smaller card preview for tight sidebar */
  .card-preview {
    grid-template-columns: repeat(4, 9px);
    grid-template-rows: repeat(4, 9px);
    min-height: 40px;
  }

  .card-panel h2, .legend-panel h2 { font-size: 0.7rem; }

  /* Board cells (landscape phone):
     overhead = scoreboard(42) + gap(6) + app-padding(10) + board-inner-gaps(24) = 82px
     Width: viewport minus right sidebar and padding */
  .board {
    --cell-size: min(
      calc((var(--game-h) - 82px) / 7),
      calc((100vw - 185px - 1rem) / 7.6),
      38px
    );
  }
}


/* ── Narrow phone tweak (≤700px, portrait) ── */
@media (max-width: 700px) {
  .app { padding-left: 0.35rem; padding-right: 0.35rem; }
  .legend-panel p { font-size: 0.68rem; }
}


/* ── Setup screen ── */
.start-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.start-row label {
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
}

/* ── How to Play accordion ── */
.how-to-play {
  margin-top: 0.75rem;
  border-top: 1px solid #dde5f0;
  padding-top: 0.45rem;
}

.how-to-play > summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 0.85rem;
  color: #0f4fa8;
  list-style: none;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.1rem 0;
}

.how-to-play > summary::-webkit-details-marker { display: none; }

.how-to-play > summary::before {
  content: "▸";
  display: inline-block;
  font-size: 0.75rem;
  transition: transform 0.15s ease;
}

.how-to-play[open] > summary::before { transform: rotate(90deg); }

.rules-body {
  margin-top: 0.4rem;
  font-size: 0.8rem;
  line-height: 1.5;
  color: #2a3550;
}

.rules-body h3 {
  margin: 0.65rem 0 0.15rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: #0f4fa8;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.rules-body h3:first-child { margin-top: 0.2rem; }

.rules-body p  { margin: 0.15rem 0; }

.rules-body ul {
  margin: 0.2rem 0;
  padding-left: 1.15rem;
}

.rules-body li { margin: 0.2rem 0; }

/* ── Result overlay ── */
.winner-banner {
  margin: 0 0 0.35rem;
  padding: 0.4rem 0.55rem;
  border-radius: 10px;
  font-weight: 800;
  background: #eef5ff;
  color: #0f4fa8;
}

.result-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13, 24, 45, 0.55);
  display: grid;
  place-items: center;
  z-index: 30;
  padding: 1rem;
}

.result-card {
  width: min(92vw, 460px);
}

.result-overlay.hidden {
  display: none;
}