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

:root {
  --bg-dark: #0a0e1a;
  --bg-mid: #111827;
  --bg-card: #1e2a3a;
  --accent-gold: #f5c842;
  --accent-red: #e03030;
  --accent-blue: #3a8fdd;
  --accent-green: #2ec97a;
  --accent-purple: #9b59b6;
  --text-light: #e8eaf0;
  --text-dim: #8899aa;
  --border: #2a3a50;
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
  --card-w: 140px;
  --card-h: 200px;

  /* Era colors */
  --ww1: #8B6914;
  --ww2: #3d6b3d;
  --cold: #1a3a6b;
  --modern: #5a1a6b;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg-dark);
  color: var(--text-light);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== HEADER ===== */
header {
  background: linear-gradient(135deg, #0a0e1a 0%, #1a0a0a 50%, #0a0e1a 100%);
  border-bottom: 2px solid var(--accent-gold);
  text-align: center;
  padding: 16px 12px 12px;
  position: relative;
}

header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23f5c842' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.site-brand {
  font-size: 0.75rem;
  color: var(--accent-gold);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.game-title {
  font-size: clamp(1.6rem, 5vw, 2.8rem);
  font-weight: 900;
  letter-spacing: 3px;
  text-transform: uppercase;
  background: linear-gradient(135deg, #f5c842, #ff6b35, #f5c842);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 2px 8px rgba(245,200,66,0.4));
}

.game-subtitle {
  color: var(--text-dim);
  font-size: 0.85rem;
  letter-spacing: 1px;
  margin-top: 4px;
}

/* ===== SCREENS ===== */
#app { flex: 1; padding: 16px; max-width: 1100px; margin: 0 auto; width: 100%; }

.screen { display: none; }
.screen.active { display: block; }

/* ===== START SCREEN ===== */
.start-card {
  background: var(--bg-mid);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  text-align: center;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.start-card h2 {
  font-size: 1.5rem;
  color: var(--accent-gold);
  margin-bottom: 10px;
}

.start-card p {
  color: var(--text-dim);
  margin-bottom: 20px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.era-picker {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.era-btn {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 12px;
  color: var(--text-light);
  cursor: pointer;
  font-size: 0.95rem;
  padding: 14px 18px;
  min-width: 130px;
  transition: all 0.2s;
  line-height: 1.4;
}

.era-btn small { color: var(--text-dim); font-size: 0.75rem; }
.era-btn:hover { border-color: var(--accent-gold); transform: translateY(-3px); box-shadow: 0 6px 20px rgba(245,200,66,0.2); }
.era-btn.selected { border-color: var(--accent-gold); background: rgba(245,200,66,0.1); }
.era-btn[data-era="ww1"].selected { border-color: var(--ww1); background: rgba(139,105,20,0.15); }
.era-btn[data-era="ww2"].selected { border-color: var(--ww2); background: rgba(61,107,61,0.15); }
.era-btn[data-era="cold"].selected { border-color: var(--cold); background: rgba(26,58,107,0.15); }
.era-btn[data-era="modern"].selected { border-color: var(--modern); background: rgba(90,26,107,0.15); }

.era-description {
  min-height: 40px;
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-bottom: 16px;
  font-style: italic;
}

/* ===== HOW TO PLAY ===== */
.how-to-play {
  background: var(--bg-mid);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px 28px;
  box-shadow: var(--shadow);
}

.how-to-play h3 { color: var(--accent-gold); margin-bottom: 12px; font-size: 1.1rem; }
.how-to-play ol { padding-left: 20px; }
.how-to-play li { margin-bottom: 8px; color: var(--text-dim); line-height: 1.6; }
.how-to-play strong { color: var(--text-light); }

/* ===== BATTLE SCREEN ===== */
#battle-screen {
  display: none;
  flex-direction: column;
  gap: 10px;
  height: calc(100vh - 160px);
}

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

.player-zone {
  background: var(--bg-mid);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.player-info {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.player-name { font-weight: 700; font-size: 0.95rem; min-width: 120px; }

.hp-bar-container {
  flex: 1;
  height: 14px;
  background: #1a1a2a;
  border-radius: 7px;
  overflow: hidden;
  min-width: 100px;
  max-width: 220px;
  border: 1px solid var(--border);
}

.hp-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-red), #ff6b35);
  border-radius: 7px;
  transition: width 0.5s ease;
  width: 100%;
}

.player-hp-bar { background: linear-gradient(90deg, var(--accent-green), #4ade80); }

.hp-text { font-size: 0.8rem; font-weight: 700; color: var(--accent-gold); white-space: nowrap; }
.deck-count { font-size: 0.75rem; color: var(--text-dim); white-space: nowrap; }

/* Field */
.field-cards {
  min-height: 60px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  padding: 4px;
  border: 1px dashed var(--border);
  border-radius: 8px;
  background: rgba(0,0,0,0.2);
}

/* Hand area */
.hand-area {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  overflow-x: auto;
  padding: 6px 4px;
}

/* ===== BATTLE MIDDLE ===== */
.battle-middle {
  display: flex;
  gap: 10px;
  align-items: stretch;
}

.battle-log {
  flex: 1;
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  max-height: 120px;
  overflow-y: auto;
  font-size: 0.82rem;
}

.log-entry { margin-bottom: 4px; color: var(--text-dim); }
.log-entry.highlight { color: var(--accent-gold); font-weight: 600; }
.log-entry.damage { color: var(--accent-red); }
.log-entry.heal { color: var(--accent-green); }
.log-entry.special { color: var(--accent-purple); }

.turn-controls {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 130px;
}

.turn-indicator {
  background: var(--accent-green);
  color: #000;
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 700;
  text-align: center;
}

.turn-indicator.enemy-turn { background: var(--accent-red); color: #fff; }

/* ===== CARD COMPONENT ===== */
.card {
  width: var(--card-w);
  height: var(--card-h);
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--bg-card);
  cursor: pointer;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  user-select: none;
  flex-shrink: 0;
}

.card:hover { transform: translateY(-8px) scale(1.04); box-shadow: 0 12px 32px rgba(0,0,0,0.6); }
.card.selected { border-color: var(--accent-gold); box-shadow: 0 0 18px rgba(245,200,66,0.6); transform: translateY(-12px); }
.card.attacking { animation: attack-anim 0.4s ease; }
.card.damaged  { animation: damage-anim 0.4s ease; }
.card.on-field { cursor: default; transform: none; }
.card.on-field:hover { transform: translateY(-4px); }

.card[data-era="ww1"] { border-color: var(--ww1); }
.card[data-era="ww2"] { border-color: var(--ww2); }
.card[data-era="cold"] { border-color: var(--cold); }
.card[data-era="modern"] { border-color: var(--modern); }

.card-era-banner {
  padding: 3px 6px;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-align: center;
  color: #fff;
}
.card[data-era="ww1"] .card-era-banner { background: var(--ww1); }
.card[data-era="ww2"] .card-era-banner { background: var(--ww2); }
.card[data-era="cold"] .card-era-banner { background: var(--cold); }
.card[data-era="modern"] .card-era-banner { background: var(--modern); }

.card-icon {
  font-size: 2.2rem;
  text-align: center;
  padding: 8px 4px 4px;
  line-height: 1;
}

.card-name {
  font-size: 0.68rem;
  font-weight: 700;
  text-align: center;
  padding: 0 6px 4px;
  color: var(--text-light);
  line-height: 1.2;
}

.card-type {
  font-size: 0.58rem;
  text-align: center;
  color: var(--text-dim);
  padding: 0 4px;
  font-style: italic;
}

.card-stats {
  display: flex;
  justify-content: space-around;
  padding: 6px 4px 4px;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

.stat { text-align: center; }
.stat-value { font-size: 0.9rem; font-weight: 900; color: var(--accent-gold); }
.stat-label { font-size: 0.55rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; }

.card-ability {
  font-size: 0.58rem;
  color: var(--accent-purple);
  text-align: center;
  padding: 2px 4px 5px;
  font-style: italic;
  line-height: 1.2;
}

/* Face-down enemy card */
.card-facedown {
  width: var(--card-w);
  height: var(--card-h);
  border-radius: 10px;
  background: repeating-linear-gradient(45deg, #1a1a2a, #1a1a2a 6px, #0d1017 6px, #0d1017 12px);
  border: 2px solid #2a3a50;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  flex-shrink: 0;
}

/* Rarity glow */
.card[data-rarity="legendary"] { box-shadow: 0 0 14px 3px rgba(255, 165, 0, 0.35); }
.card[data-rarity="rare"] { box-shadow: 0 0 8px 2px rgba(100, 160, 255, 0.3); }
.card[data-rarity="uncommon"] { box-shadow: 0 0 6px 1px rgba(80, 220, 120, 0.25); }

/* ===== BUTTONS ===== */
.btn-primary {
  background: linear-gradient(135deg, #e0a020, #f5c842);
  color: #0a0e1a;
  border: none;
  border-radius: 10px;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  letter-spacing: 1px;
  transition: transform 0.15s, box-shadow 0.15s;
  text-transform: uppercase;
}

.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(245,200,66,0.4); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-light);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.btn-secondary:hover { border-color: var(--accent-blue); background: rgba(58,143,221,0.1); }

/* ===== COLLECTION ===== */
#collection-screen { padding: 0; }

.collection-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

.collection-header h2 { color: var(--accent-gold); font-size: 1.4rem; }

.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-dim);
  cursor: pointer;
  padding: 6px 16px;
  font-size: 0.82rem;
  transition: all 0.15s;
}

.filter-btn:hover, .filter-btn.active { background: var(--accent-gold); color: #000; border-color: var(--accent-gold); font-weight: 700; }

.collection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--card-w), 1fr));
  gap: 14px;
  justify-items: center;
}

/* ===== GAME OVER ===== */
#gameover-screen { display: none; align-items: center; justify-content: center; min-height: 60vh; }
#gameover-screen.active { display: flex; }

.gameover-card {
  background: var(--bg-mid);
  border: 2px solid var(--accent-gold);
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 0 40px rgba(245,200,66,0.3);
}

#gameover-title { font-size: 2rem; color: var(--accent-gold); margin-bottom: 10px; }
#gameover-msg { color: var(--text-dim); margin-bottom: 16px; font-size: 1rem; }
#gameover-stats { color: var(--text-light); font-size: 0.9rem; margin-bottom: 24px; }
.gameover-card .btn-primary { margin-right: 10px; }

/* ===== MODAL ===== */
.modal { position: fixed; inset: 0; z-index: 1000; display: flex; align-items: center; justify-content: center; }
.modal.hidden { display: none; }

.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.75); }

.modal-content {
  position: relative;
  background: var(--bg-mid);
  border: 2px solid var(--accent-gold);
  border-radius: 16px;
  padding: 28px;
  max-width: 340px;
  width: 90%;
  z-index: 1;
  box-shadow: 0 0 40px rgba(0,0,0,0.8);
}

.modal-close {
  position: absolute;
  top: 10px; right: 14px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.2rem;
  cursor: pointer;
}

.modal-close:hover { color: var(--text-light); }

.modal-card-detail h3 { color: var(--accent-gold); margin-bottom: 8px; font-size: 1.1rem; }
.modal-card-detail .detail-icon { font-size: 3rem; text-align: center; margin: 10px 0; }
.modal-card-detail p { color: var(--text-dim); font-size: 0.88rem; margin-bottom: 6px; line-height: 1.6; }
.modal-card-detail .detail-stats { display: flex; gap: 20px; justify-content: center; margin: 14px 0; }
.modal-card-detail .detail-stat { text-align: center; }
.modal-card-detail .detail-stat-val { font-size: 1.4rem; font-weight: 900; color: var(--accent-gold); }
.modal-card-detail .detail-stat-lbl { font-size: 0.7rem; color: var(--text-dim); }
.modal-card-detail .ability-box {
  background: rgba(155,89,182,0.15);
  border: 1px solid var(--accent-purple);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.82rem;
  color: var(--accent-purple);
  margin-top: 10px;
}

/* ===== BOTTOM NAV ===== */
.bottom-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  padding: 10px;
  border-top: 1px solid var(--border);
  background: var(--bg-mid);
}

.nav-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-dim);
  cursor: pointer;
  padding: 8px 20px;
  font-size: 0.85rem;
  transition: all 0.15s;
}

.nav-btn:hover, .nav-btn.active { color: var(--accent-gold); border-color: var(--accent-gold); }

footer {
  text-align: center;
  padding: 10px;
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
}

footer a { color: var(--accent-gold); text-decoration: none; }

/* ===== ANIMATIONS ===== */
@keyframes attack-anim {
  0% { transform: translateY(0); }
  40% { transform: translateY(-30px) scale(1.1); }
  70% { transform: translateY(10px); }
  100% { transform: translateY(0); }
}

@keyframes damage-anim {
  0%, 100% { transform: translateX(0); filter: brightness(1); }
  20% { transform: translateX(-8px); filter: brightness(2) saturate(3); }
  40% { transform: translateX(8px); filter: brightness(2) saturate(3); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

@keyframes card-draw {
  from { opacity: 0; transform: translateY(30px) scale(0.8); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.card-draw-anim { animation: card-draw 0.3s ease forwards; }

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  :root { --card-w: 110px; --card-h: 160px; }
  .era-btn { min-width: 100px; padding: 10px 12px; font-size: 0.85rem; }
  .start-card { padding: 18px; }
  #app { padding: 10px; }
  .battle-middle { flex-direction: column; }
  .turn-controls { flex-direction: row; flex-wrap: wrap; }
}