/* ── CSS Variables ── */
:root {
  --bg: #f0ede8;
  --surface: #ffffff;
  --accent: #1a3a2a;
  --accent-light: #2d6a4f;
  --accent-hover: #1b4332;
  --card-word-bg: #cce8df;
  --card-cat-bg: #f4d03f;
  --slot-empty-bg: #ffffff;
  --slot-active-bg: #fef5b0;
  --card-back-bg: #1a3a2a;
  --card-border: #c8c0b8;
  --slot-border: #9b8e84;
  --text-primary: #1a1a1a;
  --text-muted: #6b6560;
  --highlight: #f4d03f;
  --highlight-border: #e67e22;
  --valid-target: #27ae60;
  --radius: 8px;
  --card-w: 80px;
  --card-h: 112px;
  --shadow: 0 2px 8px rgba(0,0,0,0.15);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  min-width: 768px;
  user-select: none;
}

/* ── Screens ── */
.screen { display: none; min-height: 100vh; }
.screen.active { display: flex; }

/* ── Main Menu ── */
#screen-menu {
  align-items: center;
  justify-content: center;
}
.menu-container {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 40px;
}
.game-title {
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -1px;
}
.menu-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 360px;
}
.difficulty-group {
  display: flex;
  gap: 10px;
}
.btn-difficulty {
  padding: 10px 20px;
  border: 2px solid var(--card-border);
  background: var(--surface);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: all 0.15s;
}
.btn-difficulty:hover { border-color: var(--accent-light); color: var(--accent-light); }
.btn-difficulty.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.lang-group { display: flex; gap: 8px; }
.btn-lang {
  padding: 8px 16px;
  border: 2px solid var(--card-border);
  background: var(--surface);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: all 0.15s;
  letter-spacing: 1px;
}
.btn-lang:hover { border-color: var(--accent-light); color: var(--accent-light); }
.btn-lang.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.menu-actions { display: flex; flex-direction: column; gap: 12px; width: 220px; }
.btn-primary {
  padding: 14px 28px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  width: 100%;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary {
  padding: 12px 28px;
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  width: 100%;
}
.btn-secondary:hover { background: var(--accent); color: #fff; }
.difficulty-info {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.hidden { display: none !important; }

/* ── Game Screen ── */
#screen-game {
  flex-direction: column;
  background: var(--bg);
}
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--accent);
  color: #fff;
  gap: 12px;
}
.top-center {
  display: flex;
  gap: 24px;
  font-size: 0.95rem;
  font-weight: 600;
}
.top-right { display: flex; gap: 8px; }
.btn-topbar {
  padding: 6px 14px;
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-topbar:hover { background: rgba(255,255,255,0.25); }
.btn-topbar:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── Game Field ── */
.game-field {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  flex: 1;
  overflow: hidden;
  align-items: center;
}
.top-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.stock-waste-row {
  display: flex;
  gap: 10px;
}
/* ── Foundations ── */
.foundations-area {
  display: flex;
  flex-direction: row;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ── Pile Zones ── */
.pile-zone {
  width: var(--card-w);
  min-height: var(--card-h);
  border: 2px dashed var(--slot-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
}
.pile-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}
.stock-zone { background: rgba(26,58,42,0.05); }
.waste-zone { background: rgba(255,255,255,0.5); }

/* ── Foundation Slots ── */
.foundation-slot {
  width: var(--card-w);
  min-height: var(--card-h);
  border: 2px dashed var(--slot-border);
  border-radius: var(--radius);
  background: var(--slot-active-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6px;
  position: relative;
  transition: border-color 0.15s, background 0.15s;
}
.foundation-slot.empty-slot {
  background: var(--slot-empty-bg);
}
.foundation-slot.empty-slot::before {
  content: '+';
  font-size: 1.8rem;
  color: var(--slot-border);
  line-height: 1;
}
.foundation-slot.valid-target {
  border-color: var(--valid-target);
  background: rgba(39,174,96,0.1);
}
.slot-category { font-size: 0.65rem; font-weight: 700; text-align: center; color: var(--accent); }
.slot-progress { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }
.slot-last-word { font-size: 0.6rem; color: var(--text-primary); margin-top: 5px; text-align: center; word-break: break-word; font-style: italic; }

/* ── Tableau ── */
.tableau-area {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  justify-content: center;
  overflow-x: auto;
  width: 100%;
}
.tableau-column {
  position: relative;
  width: var(--card-w);
  flex-shrink: 0;
}
.tableau-column.valid-target > .drop-zone-indicator {
  border-color: var(--valid-target);
  background: rgba(39,174,96,0.1);
}
.column-cards {
  position: relative;
  min-height: var(--card-h);
}
.drop-zone-indicator {
  position: absolute;
  inset: 0;
  border: 2px dashed var(--slot-border);
  border-radius: var(--radius);
  pointer-events: none;
  z-index: 0;
}
.empty-column .drop-zone-indicator::before {
  content: '+';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.8rem;
  color: var(--slot-border);
  line-height: 1;
}

/* ── Cards ── */
.card {
  width: var(--card-w);
  height: var(--card-h);
  border-radius: var(--radius);
  border: 1.5px solid var(--card-border);
  position: absolute;
  cursor: grab;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6px;
  box-shadow: var(--shadow);
  transition: transform 0.1s, box-shadow 0.1s;
  z-index: 1;
  backface-visibility: hidden;
  font-size: 0.8rem;
}
.card:active { cursor: grabbing; }
.card.face-down {
  background: var(--card-back-bg);
  cursor: default;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(255,255,255,0.04) 0px,
    rgba(255,255,255,0.04) 2px,
    transparent 2px,
    transparent 8px
  );
}
.card.face-down::after {
  content: 'W&C';
  color: rgba(255,255,255,0.4);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 1px;
}
.card.word-card {
  background: var(--card-word-bg);
  font-weight: 600;
  text-align: center;
  color: var(--text-primary);
}
.card.category-card {
  background: var(--card-cat-bg);
  border-color: var(--accent-light);
}
.card-cat-name {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  line-height: 1.2;
}
.card-cat-count {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 4px;
}
.card.highlighted {
  box-shadow: 0 0 0 3px var(--highlight), var(--shadow);
  border-color: var(--highlight-border);
}
.card.dragging {
  opacity: 1;
  transform: scale(1.05);
  box-shadow: 0 12px 32px rgba(0,0,0,0.35);
  z-index: 9999;
  cursor: grabbing;
}
.card.not-allowed { cursor: not-allowed; }

/* Tableau card stacking offset */
.card-in-column {
  left: 0;
}

/* Waste pile card */
.waste-card {
  position: relative;
  width: var(--card-w);
  height: var(--card-h);
}

/* Stock pile card stack visual */
.stock-card-stack {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.stock-count {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: rgba(255,255,255,0.3);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 10px;
}
.reshuffle-icon {
  font-size: 1.5rem;
  color: var(--accent);
}

/* ── Popups ── */
.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  animation: fadeIn 0.2s ease;
}
.popup {
  background: var(--surface);
  border-radius: 12px;
  padding: 40px 48px;
  text-align: center;
  box-shadow: 0 16px 48px rgba(0,0,0,0.25);
  max-width: 360px;
  width: 90%;
}
.popup h2 { font-size: 1.8rem; color: var(--accent); margin-bottom: 8px; }
.popup p { color: var(--text-muted); margin-bottom: 24px; }
.popup-actions { display: flex; flex-direction: column; gap: 10px; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; } }

.slot-complete-anim {
  animation: slotComplete 0.4s ease forwards;
}
@keyframes slotComplete {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.7; }
  100% { transform: scale(0); opacity: 0; }
}