/* ═══════════════════════════════════════════════════════════════════
   FreeCell — CSS
   Mobile-first. Card face/back/interaction styles come from /css/cards.css.
   ═══════════════════════════════════════════════════════════════════ */

/* Card face/back/interaction styles loaded via /css/cards.css in HTML */

/* ─── DESIGN TOKENS ─── */
:root {
  /* Palette */
  --bg-primary:    #0D1117;
  --bg-secondary:  #161B22;
  --bg-tertiary:   #21262D;
  --text-primary:  #F0F6FC;
  --text-secondary:#8B949E;
  --text-muted:    #484F58;
  --accent:        #3B82F6;
  --border:        #30363D;
  --btn-bg:        #21262D;
  --btn-active:    #30363D;
  --overlay-bg:    rgba(0, 0, 0, 0.85);

  /* Card colours */
  --suit-red:      #DC2626;
  --suit-black:    #e5e5e5;
  --card-front-bg: #f8f8f0;
  --card-front-border: #d0d0c8;
  --card-back-a:   #1a2a6c;
  --card-back-b:   #0f1a4a;
  --card-shadow:   0 2px 8px rgba(0, 0, 0, 0.55), 0 1px 3px rgba(0, 0, 0, 0.35);

  /* Card dimensions — narrower defaults for 8 columns */
  --card-w:        46px;
  --card-h:        64px;
  --card-radius:   6px;

  /* Tableau offsets (all face-up in FreeCell) */
  --offset-facedown: 20px;
  --offset-faceup:   28px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary:    #FFFFFF;
    --bg-secondary:  #F6F8FA;
    --bg-tertiary:   #E9ECF0;
    --text-primary:  #1B1E28;
    --text-secondary:#57606A;
    --text-muted:    #8C959F;
    --accent:        #3182F6;
    --border:        #D0D7DE;
    --btn-bg:        #E9ECF0;
    --btn-active:    #D0D7DE;
    --overlay-bg:    rgba(255, 255, 255, 0.92);

    --suit-black:    #1a1a1a;
    --card-front-bg: #ffffff;
    --card-front-border: #c8c8c8;
    --card-shadow:   0 2px 8px rgba(0, 0, 0, 0.18), 0 1px 3px rgba(0, 0, 0, 0.12);
  }
}

/* ─── RESET ─── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
  font-size: 16px;
  touch-action: manipulation;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Pretendard', 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  user-select: none;
  -webkit-user-select: none;
}

/* ─── APP SHELL ─── */
#app {
  width: 100%;
  max-width: 480px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* ═══════════════════════════════════════════════════════════════════
   OVERLAY SCREENS (start, win)
   ═══════════════════════════════════════════════════════════════════ */
.screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--overlay-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 200;
  padding: 28px 24px;
  gap: 28px;
  transition: opacity 0.3s ease;
  opacity: 0;
  pointer-events: none;
}

.screen.active {
  opacity: 1;
  pointer-events: auto;
}

#game-screen {
  position: relative;
  display: none;
  flex-direction: column;
  width: 100%;
  flex: 1;
  min-height: 0;
}

#game-screen.active {
  display: flex;
}

/* ── Start screen ── */
#start-screen {
  gap: 36px;
}

.title-wrap {
  text-align: center;
}

.screen-title {
  font-size: clamp(2.6rem, 14vw, 4.5rem);
  font-weight: 800;
  letter-spacing: 0.1em;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent) 0%, #a78bfa 55%, #f472b6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.screen-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Mini preview cards on start screen */
.start-cards-preview {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.preview-card {
  width: 38px;
  height: 53px;
  border-radius: 4px;
  border: 1px solid var(--card-front-border);
  background: var(--card-front-bg);
  box-shadow: var(--card-shadow);
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  padding: 3px 4px;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--suit-red);
  position: relative;
  overflow: hidden;
}

.preview-card:nth-child(2) { color: var(--suit-black); }
.preview-card:nth-child(3) { color: var(--suit-red); }
.preview-card:nth-child(4) { color: var(--suit-black); }

.preview-card .suit-center {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  opacity: 0.18;
}

/* Start button */
.start-btn {
  width: 100%;
  max-width: 300px;
  padding: 16px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), #8B5CF6);
  color: #ffffff;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.start-btn:active {
  transform: scale(0.97);
  opacity: 0.9;
}

/* ── Win screen ── */
#win-screen {
  gap: 28px;
}

.win-icon {
  font-size: 4rem;
  animation: winBounce 0.6s ease infinite alternate;
}

@keyframes winBounce {
  from { transform: translateY(0) rotate(-5deg); }
  to   { transform: translateY(-10px) rotate(5deg); }
}

.win-title {
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
  background: linear-gradient(135deg, #FFD700, #FF8C00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.win-stats {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  max-width: 300px;
}

.stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.stat-value {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.win-actions {
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 300px;
}

.btn-primary {
  flex: 1;
  padding: 13px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #8B5CF6);
  color: #ffffff;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.btn-primary:active {
  opacity: 0.85;
  transform: scale(0.97);
}

/* ═══════════════════════════════════════════════════════════════════
   GAME HEADER
   ═══════════════════════════════════════════════════════════════════ */
#game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px 10px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: var(--btn-bg);
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s ease, color 0.15s ease;
}

.icon-btn:hover {
  background: var(--btn-active);
  color: var(--text-primary);
}

.icon-btn:active {
  transform: scale(0.93);
}

/* ═══════════════════════════════════════════════════════════════════
   STATS BAR
   ═══════════════════════════════════════════════════════════════════ */
.stats-bar {
  display: flex;
  gap: 8px;
  padding: 10px 16px;
  flex-shrink: 0;
}

.stat-chip {
  flex: 1;
  padding: 8px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-align: center;
}

.stat-chip-label {
  font-size: 0.64rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 2px;
}

.stat-chip-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.03em;
}

/* ═══════════════════════════════════════════════════════════════════
   GAME AREA
   ═══════════════════════════════════════════════════════════════════ */
#game-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 10px 8px 10px;
  gap: 10px;
  overflow-y: auto;
  overflow-x: hidden;
  background: linear-gradient(160deg, #0e2a1a 0%, #0b1e12 100%);
}

@media (prefers-color-scheme: light) {
  #game-area {
    background: linear-gradient(160deg, #2d7a4e 0%, #1f5e37 100%);
  }
}

/* ─── TOP ROW: 4 free cells + spacer + 4 foundations ─── */
#top-row {
  display: flex;
  align-items: flex-start;
  gap: 5px;
  flex-shrink: 0;
}

.pile-slot {
  width: var(--card-w);
  min-width: 0;
  height: var(--card-h);
  border-radius: var(--card-radius);
  flex-shrink: 1;
  position: relative;
}

/* Spacer between free cells and foundations */
.pile-spacer {
  flex: 1;
}

/* Free cell slot — dashed outline, no suit symbol */
.free-cell-slot .empty-placeholder::after {
  content: '';
}

/* Hide placeholder when pile has a card */
.pile-slot .card ~ .empty-placeholder {
  display: none;
}

/* ─── TABLEAU ─── */
#tableau {
  display: flex;
  gap: 5px;
  flex: 1;
  align-items: flex-start;
  overflow: visible;
}

.tableau-col {
  flex: 1;
  min-width: 0;
  position: relative;
  display: flex;
  flex-direction: column;
}

/* Empty column placeholder */
.tableau-col.empty-col {
  height: var(--card-h);
  border: 2px dashed rgba(255, 255, 255, 0.18);
  border-radius: var(--card-radius);
  background: rgba(0, 0, 0, 0.1);
}

/* ═══════════════════════════════════════════════════════════════════
   FREECELL ICON (start screen)
   ═══════════════════════════════════════════════════════════════════ */
.icon-freecell {
  display: block;
  position: relative;
  width: 36px;
  height: 36px;
  animation: float 2.4s ease-in-out infinite;
}

/* Four stacked cards fanned out */
.icon-freecell::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 26px;
  background: #f8f8f0;
  border: 2px solid #d0d0c8;
  border-radius: 3px;
  top: 5px;
  left: 2px;
  box-shadow:
    5px -3px 0 -1px #f8f8f0,
    5px -3px 0 0 #d0d0c8,
    10px -6px 0 -1px #f8f8f0,
    10px -6px 0 0 #d0d0c8,
    15px -9px 0 -1px #f8f8f0,
    15px -9px 0 0 #d0d0c8;
}

/* Spade on front card */
.icon-freecell::after {
  content: '♠';
  position: absolute;
  top: 9px;
  left: 6px;
  font-size: 13px;
  color: #1a1a2e;
  line-height: 1;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-4px); }
}

/* ═══════════════════════════════════════════════════════════════════
   CARDS  (CSS-only design, no images)
   ═══════════════════════════════════════════════════════════════════ */
.card {
  width: var(--card-w);
  height: var(--card-h);
  border-radius: var(--card-radius);
  position: absolute;
  cursor: pointer;
  touch-action: none;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.card-inner {
  width: 100%;
  height: 100%;
  border-radius: var(--card-radius);
  position: relative;
  box-shadow: var(--card-shadow);
  overflow: hidden;
}
.card.face-down .card-face { display: none; }
.card.face-down .card-inner {
  background:
    repeating-linear-gradient(60deg, rgba(255,255,255,0.04) 0px, rgba(255,255,255,0.04) 1px, transparent 1px, transparent 9px),
    repeating-linear-gradient(-60deg, rgba(255,255,255,0.04) 0px, rgba(255,255,255,0.04) 1px, transparent 1px, transparent 9px),
    linear-gradient(135deg, var(--card-back-a) 0%, var(--card-back-b) 100%);
  border: 1.5px solid rgba(255, 255, 255, 0.12);
}
.card.face-down .card-inner::before {
  content: ''; position: absolute; inset: 4px;
  border-radius: calc(var(--card-radius) - 2px);
  border: 1px solid rgba(255,255,255,0.14);
  background: repeating-linear-gradient(45deg, rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 2px, transparent 2px, transparent 8px);
}
.card.face-down .card-inner::after {
  content: '✦'; position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; color: rgba(255,255,255,0.1);
}
.card.face-up .card-inner {
  background: var(--card-front-bg);
  border: 1.5px solid var(--card-front-border);
}
.card.suit-red .card-face   { color: var(--suit-red); }
.card.suit-black .card-face { color: var(--suit-black); }
.card-face {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--card-radius);
}
.card-corner-tl {
  position: absolute; top: 3px; left: 4px;
  display: flex; flex-direction: column; align-items: center; line-height: 1;
}
.card-rank { font-size: 0.72rem; font-weight: 800; letter-spacing: -0.02em; }
.card-suit-corner { font-size: 0.6rem; line-height: 1; }
.card-corner-br {
  position: absolute; bottom: 3px; right: 4px;
  display: flex; flex-direction: column; align-items: center; line-height: 1;
  transform: rotate(180deg);
}
.card-suit-center { font-size: 1.5rem; line-height: 1; opacity: 0.9; }
.card.face-card .card-suit-center { font-size: 1.8rem; }
.card.rank-A .card-suit-center    { font-size: 2rem; }

.card.selected .card-inner {
  box-shadow: var(--card-shadow), 0 0 0 2px var(--accent), 0 0 12px rgba(59,130,246,0.5);
  transform: translateY(-4px);
}
.card.hint-source .card-inner, .card.hint .card-inner {
  animation: hintPulse 0.9s ease-in-out infinite;
}
.hint-target {
  box-shadow: 0 0 0 2px #22c55e, 0 0 14px rgba(34,197,94,0.5) !important;
  border-radius: var(--card-radius);
}
@keyframes hintPulse {
  0%, 100% { box-shadow: var(--card-shadow), 0 0 0 2px #f59e0b, 0 0 10px rgba(245,158,11,0.4); }
  50%      { box-shadow: var(--card-shadow), 0 0 0 3px #f59e0b, 0 0 20px rgba(245,158,11,0.7); }
}
.card.drop-target .card-inner, .pile-slot.drop-target, .tableau-col.drop-target {
  box-shadow: 0 0 0 2px #22c55e, 0 0 12px rgba(34,197,94,0.4);
}
.card.dragging {
  opacity: 0.85; z-index: 999 !important; cursor: grabbing;
  transform: scale(1.04) rotate(1.5deg); transition: none; pointer-events: none;
}
.card.moving {
  transition: top 0.18s cubic-bezier(0.25,0.46,0.45,0.94), left 0.18s cubic-bezier(0.25,0.46,0.45,0.94), transform 0.15s ease;
  z-index: 500 !important;
}

.empty-placeholder {
  width: 100%; height: 100%;
  border: 2px dashed rgba(255,255,255,0.2);
  border-radius: var(--card-radius);
  background: rgba(0,0,0,0.15);
  position: relative;
}
.foundation-slot[data-suit="hearts"] .empty-placeholder::after   { content: '♥'; color: var(--suit-red); }
.foundation-slot[data-suit="diamonds"] .empty-placeholder::after { content: '♦'; color: var(--suit-red); }
.foundation-slot[data-suit="clubs"] .empty-placeholder::after    { content: '♣'; }
.foundation-slot[data-suit="spades"] .empty-placeholder::after   { content: '♠'; }
.foundation-slot .empty-placeholder::after {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; opacity: 0.25; pointer-events: none;
}

.card.autocomplete-fly {
  animation: flyToFoundation 0.45s cubic-bezier(0.4,0,0.2,1) forwards;
  animation-delay: var(--delay, 0ms);
  z-index: 600 !important; pointer-events: none;
}
@keyframes flyToFoundation {
  0%   { transform: translate(0,0) scale(1); opacity: 1; }
  40%  { transform: translate(calc(var(--tx)*0.6), calc(var(--ty)*0.6)) scale(1.08); opacity: 1; }
  100% { transform: translate(var(--tx), var(--ty)) scale(1); opacity: 1; }
}

/* ═══════════════════════════════════════════════════════════════════
   BOTTOM CONTROLS
   ═══════════════════════════════════════════════════════════════════ */
#bottom-controls {
  display: flex;
  gap: 6px;
  padding: 10px 16px calc(14px + env(safe-area-inset-bottom, 0px));
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.ctrl-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 8px 4px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--btn-bg);
  color: var(--text-secondary);
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}

.ctrl-btn:hover {
  background: var(--btn-active);
  color: var(--text-primary);
}

.ctrl-btn:active {
  transform: scale(0.94);
}

.ctrl-btn:disabled {
  opacity: 0.38;
  pointer-events: none;
}

.ctrl-btn-icon {
  font-size: 1.1rem;
  line-height: 1;
}

.ctrl-btn-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.ctrl-btn.available {
  border-color: #22c55e;
  color: #22c55e;
}

/* ═══════════════════════════════════════════════════════════════════
   SCROLLBAR
   ═══════════════════════════════════════════════════════════════════ */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

/* ═══════════════════════════════════════════════════════════════════
   RESPONSIVE — 8 columns need tighter card sizing
   ═══════════════════════════════════════════════════════════════════ */

/* Very narrow phones */
@media (max-width: 380px) {
  :root {
    --card-w: 40px;
    --card-h: 56px;
    --offset-facedown: 16px;
    --offset-faceup:   22px;
  }

  #top-row  { gap: 3px; }
  #tableau  { gap: 3px; }
  #game-area { padding: 8px 6px 0; gap: 8px; }
}

/* Medium phones (420px+) */
@media (min-width: 420px) {
  :root {
    --card-w: 52px;
    --card-h: 73px;
    --offset-facedown: 18px;
    --offset-faceup:   26px;
  }
}

/* Larger phones */
@media (min-width: 480px) {
  :root {
    --card-w: 56px;
    --card-h: 78px;
    --offset-facedown: 20px;
    --offset-faceup:   28px;
  }
}

/* Tall screens */
@media (min-height: 800px) {
  :root {
    --offset-faceup: 30px;
  }

  #game-area { padding: 12px 10px 0; gap: 12px; }
}

/* ═══════════════════════════════════════════════════════════════════
   MISC
   ═══════════════════════════════════════════════════════════════════ */
.card, .pile-slot, .tableau-col {
  -webkit-touch-callout: none;
}

@media (prefers-reduced-motion: reduce) {
  .card.autocomplete-fly { animation-duration: 0.01ms !important; }
  .card.hint .card-inner, .card.hint-source .card-inner { animation: none; }
  .win-icon               { animation: none; }
  .icon-freecell          { animation: none; }
  @keyframes winBounce    { from {} to {} }
}