/* ─── Design Tokens ─── */
:root {
  --font-display: 'Cabinet Grotesk', sans-serif;
  --font-body: 'Satoshi', sans-serif;

  --color-bg: #0a0a0f;
  --color-surface: #13131a;
  --color-surface-2: #1a1a24;
  --color-border: rgba(255,255,255,0.08);
  --color-text: #e8e8ec;
  --color-text-muted: #7a7a8e;
  --color-text-faint: #4a4a5a;
  --color-primary: #f04040;
  --color-primary-hover: #d83030;
  --color-primary-glow: rgba(240, 64, 64, 0.25);
  --color-success: #40d870;
  --color-danger: #f04040;
  --color-warning: #f0a840;
  --color-card-red: #dc3545;
  --color-card-black: #e8e8ec;

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-ui: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-glow: 0 0 20px var(--color-primary-glow);
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  overflow: hidden;
}

button { cursor: pointer; border: none; font: inherit; color: inherit; background: none; }
input { font: inherit; color: inherit; }

/* ─── Screens ─── */
.screen { display: none; width: 100%; height: 100dvh; }
.screen.active { display: flex; }

/* ─── Lobby ─── */
#lobby-screen {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  background:
    radial-gradient(ellipse at 30% 20%, rgba(240,64,64,0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(64,216,112,0.04) 0%, transparent 50%),
    var(--color-bg);
}

.lobby-container {
  max-width: 400px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.logo-area {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.logo-icon {
  width: 72px;
  height: 72px;
  color: var(--color-text);
}

.logo-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  line-height: 1.1;
}

.logo-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ─── Lobby Card ─── */
.lobby-card {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.lobby-card.hidden { display: none; }

.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  outline: none;
  transition: border-color var(--transition-ui);
}
.input:focus { border-color: var(--color-primary); }
.input::placeholder { color: var(--color-text-faint); }

.btn {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  text-align: center;
  transition: background var(--transition-ui), transform var(--transition-ui);
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-primary.hidden { display: none; }

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover { background: rgba(255,255,255,0.06); }

.btn-small {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.divider-text {
  text-align: center;
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  position: relative;
}
.divider-text span { background: var(--color-surface); padding: 0 var(--space-3); position: relative; z-index: 1; }
.divider-text::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-border);
}

/* Room code display */
.room-code-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
}

.room-code-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.room-code {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-primary);
}

.btn-copy {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: all var(--transition-ui);
}
.btn-copy:hover { background: rgba(255,255,255,0.1); color: var(--color-text); }

.players-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.player-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
}

.player-avatar {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: 700;
  color: #fff;
}

.player-name { flex: 1; }
.player-badge {
  font-size: var(--text-xs);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(240,64,64,0.15);
  color: var(--color-primary);
}

.waiting-text {
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.error-msg {
  width: 100%;
  padding: var(--space-3);
  background: rgba(240,64,64,0.1);
  border: 1px solid rgba(240,64,64,0.3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-danger);
  text-align: center;
}
.error-msg.hidden { display: none; }

.install-prompt {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.install-prompt.hidden { display: none; }
.install-prompt p { font-size: var(--text-xs); color: var(--color-text-muted); flex: 1; }

.footer {
  position: absolute;
  bottom: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer a { color: var(--color-text-faint); text-decoration: none; }
.footer a:hover { color: var(--color-text-muted); }

/* ─── Game Screen ─── */
#game-screen {
  flex-direction: column;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(20,60,20,0.15) 0%, transparent 60%),
    var(--color-bg);
}

.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  z-index: 10;
}

.game-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.game-logo-sm {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 0.06em;
}

.room-badge {
  font-size: var(--text-xs);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  font-weight: 600;
}

.action-feed {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  max-width: 300px;
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.game-board {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  position: relative;
  overflow: hidden;
}

/* ─── Player Zones ─── */
.player-zones {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  width: 100%;
  max-width: 700px;
  position: absolute;
  top: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
}

.player-zone {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-ui), box-shadow var(--transition-ui);
  position: relative;
}

.player-zone.is-turn {
  border-color: var(--color-primary);
  box-shadow: 0 0 16px var(--color-primary-glow);
}

.player-zone.is-me {
  background: rgba(240,64,64,0.04);
}

.player-zone.is-out {
  opacity: 0.35;
}

.pz-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
  color: #fff;
  flex-shrink: 0;
}

.pz-info { flex: 1; min-width: 0; }

.pz-name {
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pz-cards {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums lining-nums;
}

.pz-deck-btn {
  width: 52px;
  height: 72px;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: linear-gradient(135deg, #2a1520 0%, #1a0a14 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  transition: all var(--transition-ui);
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}

.pz-deck-btn::before {
  content: '';
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(240,64,64,0.2);
  border-radius: 4px;
}

.pz-deck-btn.clickable {
  border-color: var(--color-primary);
  cursor: pointer;
  animation: pulse-border 1.5s ease-in-out infinite;
}

.pz-deck-btn.clickable:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.pz-deck-btn.clickable:active {
  transform: scale(0.95);
}

.pz-deck-btn.empty-deck {
  opacity: 0.2;
  background: var(--color-surface-2);
  border-color: var(--color-border);
}

.pz-deck-btn.empty-deck::before { display: none; }

@keyframes pulse-border {
  0%, 100% { box-shadow: 0 0 0 0 var(--color-primary-glow); }
  50% { box-shadow: 0 0 12px 4px var(--color-primary-glow); }
}

/* ─── Center Pile ─── */
.center-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  z-index: 5;
}

.pile-stack {
  position: relative;
  width: 90px;
  height: 126px;
}

.pile-card {
  width: 90px;
  height: 126px;
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
  font-weight: 700;
  position: relative;
  transition: transform 0.15s ease;
}

.pile-card.empty { border-style: dashed; }

.pile-empty-text {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 500;
}

.pile-card.red { color: var(--color-card-red); background: #1a1a24; border-color: rgba(220,53,69,0.3); }
.pile-card.black { color: var(--color-card-black); background: #1a1a24; border-color: rgba(255,255,255,0.15); }

.pile-card .card-rank {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: 1;
}

.pile-card .card-suit {
  font-size: var(--text-lg);
  line-height: 1;
}

.pile-card .card-corner {
  position: absolute;
  font-size: var(--text-xs);
  line-height: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
}

.pile-card .card-corner.tl { top: 6px; left: 6px; }
.pile-card .card-corner.br { bottom: 6px; right: 6px; transform: rotate(180deg); }

.pile-count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

/* Slap button */
.slap-btn {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary) 0%, #c02020 100%);
  color: #fff;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-ui), box-shadow var(--transition-ui), opacity var(--transition-ui);
  box-shadow: 0 4px 24px var(--color-primary-glow);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.slap-btn:not(:disabled):hover {
  transform: scale(1.08);
  box-shadow: 0 6px 32px rgba(240,64,64,0.4);
}

.slap-btn:not(:disabled):active {
  transform: scale(0.92);
}

.slap-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

.slap-btn.can-slap {
  animation: slap-pulse 0.6s ease-in-out infinite;
}

@keyframes slap-pulse {
  0%, 100% { transform: scale(1); box-shadow: 0 4px 24px var(--color-primary-glow); }
  50% { transform: scale(1.06); box-shadow: 0 6px 36px rgba(240,64,64,0.5); }
}

/* Card flip animation */
@keyframes card-flip-in {
  0% { transform: translateY(-30px) rotateY(90deg); opacity: 0; }
  60% { transform: translateY(0) rotateY(0deg); opacity: 1; }
  100% { transform: translateY(0) rotateY(0deg); opacity: 1; }
}

.pile-card.flip-anim {
  animation: card-flip-in 0.35s ease-out;
}

/* Slap success animation */
@keyframes slap-success {
  0% { transform: scale(1); }
  20% { transform: scale(0.85); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

.pile-card.slap-anim {
  animation: slap-success 0.4s ease-out;
}

/* ─── Game Over Overlay ─── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.overlay.hidden { display: none; }

.overlay-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  max-width: 360px;
  width: 90%;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.overlay-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-primary);
}

.overlay-winner {
  font-size: var(--text-lg);
  font-weight: 600;
}

/* ─── Mobile adjustments ─── */
@media (max-width: 600px) {
  .player-zones {
    grid-template-columns: 1fr;
    gap: var(--space-2);
    top: var(--space-2);
    padding: 0 var(--space-2);
  }

  .game-board {
    padding: var(--space-2);
  }

  .center-area {
    margin-top: auto;
    margin-bottom: var(--space-4);
  }

  #tutorial-screen .game-board {
    padding-bottom: 160px;
  }

  #tutorial-screen .center-area {
    margin-bottom: 0;
  }

  .slap-btn {
    width: 100px;
    height: 100px;
    font-size: var(--text-base);
  }

  .pile-card {
    width: 72px;
    height: 100px;
  }

  .pile-stack {
    width: 72px;
    height: 100px;
  }

  .pz-deck-btn {
    width: 44px;
    height: 60px;
  }
}

@media (min-width: 601px) {
  .center-area {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -20%);
  }

  .player-zones {
    top: var(--space-8);
  }
}

/* ─── Tutorial Button ─── */
.btn-tutorial {
  background: transparent;
  color: var(--color-success);
  border: 1px solid rgba(64, 216, 112, 0.3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: all var(--transition-ui);
}
.btn-tutorial:hover {
  background: rgba(64, 216, 112, 0.08);
  border-color: rgba(64, 216, 112, 0.5);
}

/* ─── Tutorial Screen ─── */
#tutorial-screen {
  flex-direction: column;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(20,60,20,0.15) 0%, transparent 60%),
    var(--color-bg);
}

.tut-lesson-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.tut-lesson-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-success);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.tut-progress {
  display: flex;
  gap: 4px;
  align-items: center;
}

.tut-progress-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  transition: all var(--transition-ui);
}

.tut-progress-dot.active {
  background: var(--color-success);
  border-color: var(--color-success);
  box-shadow: 0 0 8px rgba(64, 216, 112, 0.4);
}

.tut-progress-dot.done {
  background: rgba(64, 216, 112, 0.4);
  border-color: rgba(64, 216, 112, 0.5);
}

/* Coach area */
.tut-coach-area {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  padding-bottom: max(var(--space-4), env(safe-area-inset-bottom));
  background: linear-gradient(to top, rgba(10,10,15,0.95) 0%, rgba(10,10,15,0.8) 60%, transparent 100%);
  z-index: 50;
  pointer-events: none;
}

.tut-coach-area > * {
  pointer-events: auto;
}

.tut-coach-bubble {
  max-width: 520px;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid rgba(64, 216, 112, 0.25);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-text);
  text-align: center;
  box-shadow: 0 -4px 24px rgba(0,0,0,0.3);
  animation: coach-in 0.3s ease-out;
}

@keyframes coach-in {
  0% { opacity: 0; transform: translateY(12px); }
  100% { opacity: 1; transform: translateY(0); }
}

.tut-coach-actions {
  display: flex;
  gap: var(--space-3);
}

.btn-coach {
  min-width: 140px;
}

/* ─── Utility ─── */
.hidden { display: none !important; }

/* Selection styling */
::selection {
  background: rgba(240, 64, 64, 0.25);
  color: var(--color-text);
}