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

:root {
  --table-green: #1a6b3c;
  --table-dark: #145530;
  --card-width: 72px;
  --card-height: 100px;
  --card-radius: 7px;
  --red: #d32f2f;
  --black: #1a1a1a;
  --gold: #ffd700;
  --life-full: #ffd700;
  --life-empty: #555;
  --transition-speed: 0.3s;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: #fff;
  min-height: 100vh;
  overflow-x: hidden;

  /* CSS wood plank tile background */
  background-color: #5c3a1e;
  background-image:
    /* Plank horizontal seams */
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 119px,
      rgba(0,0,0,0.3) 119px,
      rgba(0,0,0,0.3) 121px
    ),
    /* Vertical staggered seams (offset every other row) */
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 199px,
      rgba(0,0,0,0.25) 199px,
      rgba(0,0,0,0.25) 201px
    ),
    /* Wood grain streaks */
    repeating-linear-gradient(
      90deg,
      rgba(0,0,0,0) 0px,
      rgba(0,0,0,0.03) 8px,
      rgba(0,0,0,0) 12px,
      rgba(0,0,0,0.04) 24px,
      rgba(0,0,0,0) 30px,
      rgba(0,0,0,0.02) 45px,
      rgba(0,0,0,0) 50px
    ),
    /* Warm tone variation across planks */
    repeating-linear-gradient(
      0deg,
      #6b4226 0px,
      #5c3a1e 40px,
      #7a4f30 80px,
      #5c3a1e 120px
    );
}

/* ===== HEADER ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 8px 20px;
  background: rgba(0,0,0,0.5);
  border-bottom: 2px solid rgba(0,0,0,0.4);
}

.header h1 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 2px;
}

.round-info {
  font-size: 13px;
  opacity: 0.8;
}

.btn-restart {
  padding: 5px 12px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.7);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-restart:hover {
  background: rgba(255,255,255,0.25);
  color: #fff;
}

.btn-restart.hidden {
  display: none;
}

/* ===== MESSAGE BAR ===== */
.message-bar {
  text-align: center;
  padding: 6px;
  font-size: 14px;
  font-weight: 600;
  min-height: 32px;
  background: rgba(0,0,0,0.25);
  border-radius: 8px;
  margin: 0 8px;
  transition: all var(--transition-speed);
}

.message-bar.instant-win {
  background: var(--gold);
  color: #000;
  font-size: 18px;
  animation: pulse 0.5s ease 3;
}

.message-bar.knock {
  background: #e65100;
  animation: pulse 0.5s ease 2;
}

/* ===== KNOCK BANNER ===== */
.knock-banner {
  text-align: center;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  background: linear-gradient(90deg, #bf360c, #e65100, #bf360c);
  background-size: 200% 100%;
  color: #fff;
  border-bottom: 2px solid #ff6d00;
  animation: knockSlide 2s linear infinite, knockAppear 0.4s ease;
}

.knock-banner.hidden {
  display: none;
}

.knock-banner .knock-icon {
  font-size: 18px;
  margin-right: 6px;
}

@keyframes knockSlide {
  0% { background-position: 0% 0%; }
  100% { background-position: 200% 0%; }
}

@keyframes knockAppear {
  from { transform: translateY(-100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

/* ===== GAME TABLE ===== */
.game-table {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 16px 24px;
  margin: 12px;
  border-radius: 16px;
  min-height: calc(100vh - 110px);
  background: radial-gradient(ellipse at center, var(--table-green) 0%, var(--table-dark) 100%);
  box-shadow:
    inset 0 0 60px rgba(0,0,0,0.3),
    0 4px 20px rgba(0,0,0,0.5),
    0 0 0 4px #3a2210;
  border: 2px solid rgba(255,255,255,0.05);
  position: relative;
}

/* ===== OPPONENT AREA ===== */
.opponents-area {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  width: 100%;
  max-width: 800px;
}

.player-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px;
  border-radius: 10px;
  transition: background var(--transition-speed), box-shadow var(--transition-speed), opacity var(--transition-speed);
  min-width: calc(var(--card-width) * 4 + 4px * 3 + 16px);
  min-height: calc(var(--card-height) + 60px);
}

.player-area.active {
  background: rgba(255, 215, 0, 0.15);
  box-shadow: 0 0 16px rgba(255, 215, 0, 0.3);
}

.player-area.eliminated {
  opacity: 0.35;
}

.player-name {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.player-name.knocked {
  color: #ff6d00;
}

.lives-display {
  display: flex;
  gap: 4px;
}

.life-token {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--life-full);
  border: 2px solid rgba(255,255,255,0.3);
  transition: all 0.4s ease;
}

.life-token.lost {
  background: var(--life-empty);
  border-color: rgba(255,255,255,0.1);
  transform: scale(0.8);
}

.hand {
  display: flex;
  gap: 4px;
  justify-content: center;
  width: calc(var(--card-width) * 4 + 4px * 3);
  min-height: var(--card-height);
}

/* ===== PLAYER ACTION BUBBLE ===== */
.player-action {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(255, 215, 0, 0.2);
  color: var(--gold);
  white-space: nowrap;
  min-height: 20px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.player-action.visible {
  opacity: 1;
  animation: actionPop 0.3s ease;
}

.player-action.knock-action {
  background: rgba(230, 81, 0, 0.35);
  color: #ff9100;
  font-size: 13px;
  letter-spacing: 1px;
}

/* Persistent knock indicator */
.player-action.knock-persistent {
  opacity: 1;
  background: rgba(230, 81, 0, 0.35);
  color: #ff9100;
  font-weight: 800;
}

@keyframes actionPop {
  0% { opacity: 0; transform: translateY(4px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ===== FLYING CARD ANIMATION ===== */
.flying-card {
  position: fixed;
  z-index: 200;
  width: var(--card-width);
  height: var(--card-height);
  pointer-events: none;
  transition: left 0.35s ease-in-out, top 0.35s ease-in-out;
}

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

/* ===== CARDS ===== */
.card {
  width: var(--card-width);
  height: var(--card-height);
  border-radius: var(--card-radius);
  position: relative;
  cursor: default;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  perspective: 600px;
  flex-shrink: 0;
}

.card-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.5s ease;
  border-radius: var(--card-radius);
}

.card.flipped .card-inner {
  transform: rotateY(180deg);
}

.card-front, .card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--card-radius);
  border: 1px solid rgba(0,0,0,0.2);
}

.card-front {
  background: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4px;
  transform: rotateY(180deg);
}

.card-front.red { color: var(--red); }
.card-front.black { color: var(--black); }

.card-rank {
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
}

.card-suit {
  font-size: 24px;
  line-height: 1;
}

.card-corner {
  position: absolute;
  font-size: 9px;
  font-weight: 700;
  line-height: 1.1;
  text-align: center;
}

.card-corner.top-left {
  top: 3px;
  left: 4px;
}

.card-corner.bottom-right {
  bottom: 3px;
  right: 4px;
  transform: rotate(180deg);
}

.card-back {
  background: linear-gradient(135deg, #1a237e, #283593);
  border: 3px solid #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-back::after {
  content: '';
  width: 60%;
  height: 75%;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 4px;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 5px,
    rgba(255,255,255,0.05) 5px,
    rgba(255,255,255,0.05) 10px
  );
}

/* Interactive cards (human hand during discard phase) */
.card.clickable {
  cursor: pointer;
}

.card.clickable:hover {
  transform: translateY(-10px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}

/* Invisible placeholder card for animation target */
.card.placeholder {
  visibility: hidden;
}

/* ===== CENTER TABLE (Stock + Discard) ===== */
.center-table {
  display: flex;
  gap: 36px;
  align-items: center;
  padding: 10px;
}

.pile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.pile-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.7;
}

.pile .card {
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.pile .card.clickable {
  cursor: pointer;
}

.pile .card.clickable:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 6px 16px rgba(255, 215, 0, 0.4);
}

.stock-pile .card {
  position: relative;
}

.stock-pile .card::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  right: -3px;
  bottom: -3px;
  background: #1a237e;
  border-radius: var(--card-radius);
  border: 1px solid rgba(255,255,255,0.1);
  z-index: -1;
}

/* ===== HUMAN PLAYER AREA ===== */
.human-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border-radius: 14px;
  min-width: 300px;
}

.human-area.active {
  background: rgba(255, 215, 0, 0.1);
  box-shadow: 0 0 30px rgba(255, 215, 0, 0.2);
}

.human-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

.human-hand {
  display: flex;
  gap: 8px;
}

/* ===== BUTTONS ===== */
.btn {
  padding: 8px 20px;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-knock {
  background: #e65100;
  color: #fff;
}

.btn-knock:not(:disabled):hover {
  background: #bf360c;
  transform: scale(1.05);
}

.btn-primary {
  background: var(--gold);
  color: #000;
}

.btn-primary:not(:disabled):hover {
  background: #ffca28;
  transform: scale(1.05);
}

.btn-secondary {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
}

.btn-secondary:not(:disabled):hover {
  background: rgba(255,255,255,0.25);
}

/* ===== OVERLAYS ===== */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
  overflow-y: auto;
  padding: 20px 0;
}

.overlay.hidden {
  display: none;
}

.overlay-content {
  background: #1e3a2f;
  border: 2px solid rgba(255, 215, 0, 0.3);
  border-radius: 16px;
  padding: 28px;
  max-width: 500px;
  width: 90%;
  text-align: center;
  animation: fadeIn 0.3s ease;
}

.overlay-content h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.overlay-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 14px;
}

/* ===== SETUP SCREEN ===== */
.setup-content h2 {
  font-size: 36px;
  margin-bottom: 8px;
  letter-spacing: 4px;
}

.setup-content p {
  opacity: 0.7;
  margin-bottom: 20px;
}

.setup-section {
  margin-bottom: 20px;
}

.setup-section label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
  opacity: 0.8;
}

.setup-options {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.setup-options .btn {
  min-width: 48px;
}

.setup-options .btn.selected {
  background: var(--gold);
  color: #000;
  box-shadow: 0 0 12px rgba(255, 215, 0, 0.4);
}

.btn-how-to-play {
  margin-top: 12px;
  display: block;
  width: 100%;
}

/* ===== HOW TO PLAY ===== */
.how-to-play {
  margin-top: 16px;
  padding: 16px;
  background: rgba(0,0,0,0.25);
  border-radius: 10px;
  text-align: left;
  animation: fadeIn 0.3s ease;
}

.how-to-play.hidden {
  display: none;
}

.how-to-play h3 {
  text-align: center;
  font-size: 15px;
  margin-bottom: 10px;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.how-to-play ul {
  list-style: none;
  padding: 0;
}

.how-to-play li {
  font-size: 13px;
  line-height: 1.5;
  padding: 4px 0;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.how-to-play li:last-child {
  border-bottom: none;
}

/* ===== HUMAN SCORE DISPLAY ===== */
.human-score {
  font-size: 16px;
  font-weight: 800;
  color: var(--gold);
  letter-spacing: 1px;
  min-height: 22px;
}

/* ===== ROUND RESULTS ===== */
.results-list {
  list-style: none;
  margin: 12px 0;
  text-align: left;
}

.results-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  border-radius: 6px;
  margin-bottom: 3px;
}

.results-list li.loser {
  background: rgba(211, 47, 47, 0.25);
}

.results-list li.winner {
  background: rgba(255, 215, 0, 0.15);
}

.result-hand {
  display: flex;
  gap: 4px;
}

.result-card {
  font-size: 13px;
  font-weight: 700;
  padding: 2px 5px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
}

.result-card.red { color: var(--red); }
.result-card.black { color: var(--black); background: rgba(255,255,255,0.85); }

.result-score {
  font-weight: 800;
  font-size: 16px;
}

/* ===== GAME OVER ===== */
.gameover-content h2 {
  font-size: 28px;
  color: var(--gold);
}

.gameover-content .winner-name {
  font-size: 40px;
  font-weight: 800;
  margin: 12px 0;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  :root {
    --card-width: 56px;
    --card-height: 78px;
  }

  .header h1 { font-size: 18px; }
  .message-bar { font-size: 12px; padding: 4px; }
  .opponents-area { gap: 10px; }
  .center-table { gap: 20px; padding: 8px; }
  .game-table { padding: 8px; gap: 8px; }
  .card-rank { font-size: 16px; }
  .card-suit { font-size: 20px; }
  .human-hand { gap: 6px; }
  .overlay-content { padding: 18px; }
  .btn { padding: 7px 14px; font-size: 11px; }
  .player-action { font-size: 10px; }
}

@media (max-width: 400px) {
  :root {
    --card-width: 48px;
    --card-height: 67px;
  }

  .opponents-area { gap: 6px; }
  .player-name { font-size: 11px; }
  .card-corner { font-size: 7px; }
  .player-action { font-size: 9px; padding: 3px 5px; }
}