/* ═══════════════════════════════════════════════════════════════════
   FLIP WARS — CSS Design System
   Premium dark arcade aesthetic with glassmorphism & micro-animations
   ═══════════════════════════════════════════════════════════════════ */

:root {
  --bg: #0f1117;
  --surface: #181c25;
  --surface2: #1e2330;
  --border: #282e3a;
  --text: #e8ecf4;
  --muted: #6b7a90;
  --yellow: #F4C430;
  --yellow-dim: #7a6218;
  --blue: #2E86C1;
  --blue-dim: #174360;
  --accent: #50FFAA;
  --accent-dim: #1a6644;
  --purple: #9B59B6;
  --red: #FF5555;
  --green: #50FF78;
  --bh-border: #6A0DAD;
  --scan-bg: #0A0A14;
  --scan-text: #50FF78;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ─── SCREEN TRANSITIONS ──────────────────────────────────────────── */
.screen {
  display: none;
  width: 100%;
  min-height: 100vh;
}
.screen.active { display: flex; flex-direction: column; }

/* ═══════════════════════════════════════════════════════════════════
   MENU SCREEN
   ═══════════════════════════════════════════════════════════════════ */
#menuScreen {
  position: relative;
  justify-content: center;
  align-items: center;
}

#particleCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.menu-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 40px;
}

.menu-title {
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 900;
  letter-spacing: 4px;
  color: var(--yellow);
  text-shadow: 0 0 40px var(--yellow), 0 0 80px rgba(244,196,48,0.3);
  animation: titlePulse 2.8s ease-in-out infinite;
}

@keyframes titlePulse {
  0%, 100% { color: var(--yellow); text-shadow: 0 0 40px var(--yellow), 0 0 80px rgba(244,196,48,0.3); }
  50% { color: var(--accent); text-shadow: 0 0 40px var(--accent), 0 0 80px rgba(80,255,170,0.3); }
}

.menu-subtitle {
  font-size: 17px;
  font-style: italic;
  color: var(--muted);
  margin-bottom: 10px;
}

.selectors {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 10px 0;
}

.selector-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.selector-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.2px;
  color: var(--muted);
}

.styled-select {
  background: var(--surface);
  color: var(--text);
  border: 1.5px solid var(--accent);
  border-radius: 8px;
  padding: 10px 16px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  width: 220px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2350FFAA' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.styled-select:hover, .styled-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(80,255,170,0.2);
}

.styled-select option {
  background: var(--surface);
  color: var(--text);
}

.menu-btn {
  width: 300px;
  padding: 14px 30px;
  border-radius: 26px;
  border: 1.8px solid transparent;
  font-family: inherit;
  font-size: 18px;
  font-weight: 700;
  color: white;
  cursor: pointer;
  transition: all 0.15s ease;
  position: relative;
  overflow: hidden;
}

.play-btn {
  background: var(--accent-dim);
  border-color: var(--accent);
  font-size: 22px;
}
.play-btn:hover {
  background: var(--accent);
  color: #000;
  box-shadow: 0 0 24px var(--accent);
  transform: scale(1.04);
}

.rules-btn {
  background: #252a35;
  border-color: var(--muted);
  font-size: 16px;
}
.rules-btn:hover {
  background: var(--muted);
  color: #000;
  box-shadow: 0 0 18px rgba(107,122,144,0.4);
  transform: scale(1.04);
}

.exit-btn {
  background: #3d1515;
  border-color: #C0392B;
  font-size: 16px;
}
.exit-btn:hover {
  background: #C0392B;
  color: white;
  box-shadow: 0 0 18px rgba(192,57,43,0.5);
  transform: scale(1.04);
}

.team-label {
  font-size: 11px;
  color: #555560;
  margin-top: 10px;
}

/* ═══════════════════════════════════════════════════════════════════
   GAME SCREEN
   ═══════════════════════════════════════════════════════════════════ */

/* ─── HUD ──────────────────────────────────────────────────────── */
.hud {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  background: #141820;
  border-bottom: 1px solid var(--border);
  gap: 8px;
  flex-shrink: 0;
}

.hud-score {
  min-width: 130px;
  padding: 8px 20px;
  border-radius: 12px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.player-score {
  background: rgba(244,196,48,0.08);
  border: 1.5px solid var(--yellow);
}
.player-score .hud-value { color: var(--yellow); text-shadow: 0 0 14px var(--yellow); }
.player-score .hud-label { color: #d4a826; }

.cpu-score {
  background: rgba(46,134,193,0.08);
  border: 1.5px solid var(--blue);
}
.cpu-score .hud-value { color: var(--blue); text-shadow: 0 0 14px var(--blue); }
.cpu-score .hud-label { color: #5aabdb; }

.hud-label { font-size: 10px; font-weight: 700; }
.hud-value { font-size: 30px; font-weight: 700; }

.hud-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.hud-turn-group { text-align: center; }
.hud-mini-label { font-size: 9px; font-weight: 700; color: var(--muted); margin-right: 4px; }
.hud-mini-value { font-size: 16px; font-weight: 700; color: var(--accent); }

.hud-status {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  transition: color 0.3s;
}

.hud-active-border {
  border-color: var(--accent) !important;
  box-shadow: 0 0 10px rgba(80,255,170,0.25) !important;
  border-width: 2.5px !important;
}

/* ─── GAME LAYOUT ──────────────────────────────────────────────── */
.game-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.game-left {
  flex: 0 0 62%;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}

.board-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.board-grid {
  display: grid;
  gap: 8px;
}

/* ─── TILES ────────────────────────────────────────────────────── */
.tile {
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
  user-select: none;
  -webkit-user-select: none;
}

.tile:hover:not(.tile-disabled):not(.tile-blackhole) {
  transform: scale(1.06);
  box-shadow: 0 0 18px var(--accent);
  z-index: 2;
}

.tile-player {
  background: linear-gradient(155deg, #f7d24e, #b5910c);
  box-shadow: 0 4px 14px rgba(244,196,48,0.25);
}

.tile-cpu {
  background: linear-gradient(155deg, #3ca4e8, #1b6999);
  box-shadow: 0 4px 14px rgba(46,134,193,0.25);
}

.tile-blackhole {
  background: #000;
  border: 2.5px solid var(--bh-border);
  box-shadow: 0 0 10px var(--bh-border);
  cursor: default;
}

.tile-disabled { opacity: 0.85; cursor: default; }
.tile-disabled:hover { transform: none !important; box-shadow: none !important; }

.tile-locked .tile-player,
.tile-locked.tile-player {
  background: linear-gradient(155deg, #6b5410, #3d2f06);
}
.tile-locked .tile-cpu,
.tile-locked.tile-cpu {
  background: linear-gradient(155deg, #153a55, #0b1f30);
}

.tile-id {
  position: absolute;
  top: 3px;
  left: 6px;
  font-size: 9px;
  font-weight: 700;
  color: rgba(255,255,255,0.45);
}

.tile-value {
  font-size: 15px;
  font-weight: 700;
  color: white;
}

.tile-value.negative { color: #FF9696; }

.tile-lock-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--red);
}

.tile-bh-icon {
  font-size: 22px;
  color: var(--bh-border);
}

/* Tile flip animation */
@keyframes tileFlipIn {
  0% { transform: scaleX(0); }
  100% { transform: scaleX(1); }
}
@keyframes tileFlipOut {
  0% { transform: scaleX(1); }
  100% { transform: scaleX(0); }
}

.tile-flip-out { animation: tileFlipOut 0.12s ease-in forwards; }
.tile-flip-in { animation: tileFlipIn 0.12s ease-out forwards; }

/* Tile entrance */
@keyframes tileEntrance {
  0% { transform: scale(0); opacity: 0; }
  70% { transform: scale(1.05); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

.tile-entering {
  transform: scale(0);
  opacity: 0;
  animation: tileEntrance 0.28s ease-out forwards;
}

/* Hint pulse */
@keyframes hintPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 3px var(--accent), 0 0 20px var(--accent); }
  50% { opacity: 0.35; box-shadow: 0 0 0 6px var(--accent), 0 0 40px var(--accent); }
}

.tile-hint {
  animation: hintPulse 0.7s ease-in-out 5;
  z-index: 5;
}

/* Celebration flash */
@keyframes celebFlash {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}
.tile-celebrate { animation: celebFlash 0.36s ease-in-out 4; }

/* ─── CONTROLS ─────────────────────────────────────────────────── */
.controls {
  display: flex;
  gap: 10px;
  padding: 10px 16px;
  background: #141820;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  justify-content: center;
  flex-shrink: 0;
}

.ctrl-btn {
  padding: 9px 18px;
  border-radius: 22px;
  border: 1.5px solid;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  color: white;
  cursor: pointer;
  transition: all 0.12s ease;
  background: transparent;
}

.ctrl-btn.accent { border-color: var(--accent); background: var(--accent-dim); }
.ctrl-btn.accent:hover { background: var(--accent); color: #000; box-shadow: 0 0 14px var(--accent); transform: scale(1.06); }

.ctrl-btn.yellow { border-color: var(--yellow); background: var(--yellow-dim); }
.ctrl-btn.yellow:hover { background: var(--yellow); color: #000; box-shadow: 0 0 14px var(--yellow); transform: scale(1.06); }

.ctrl-btn.purple { border-color: var(--purple); background: #3e204d; }
.ctrl-btn.purple:hover { background: var(--purple); color: #000; box-shadow: 0 0 14px var(--purple); transform: scale(1.06); }

.ctrl-btn.neutral { border-color: var(--muted); background: #252a35; }
.ctrl-btn.neutral:hover { background: var(--muted); color: #000; box-shadow: 0 0 14px rgba(107,122,144,0.4); transform: scale(1.06); }

/* ═══════════════════════════════════════════════════════════════════
   BRAIN SCANNER
   ═══════════════════════════════════════════════════════════════════ */
.scanner {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--scan-bg);
  border-left: 1.5px solid var(--scan-text);
  min-width: 0;
  overflow: hidden;
}

.scanner-header {
  padding: 8px 12px;
  background: #0d1021;
  border-bottom: 1.5px solid var(--scan-text);
  flex-shrink: 0;
}

.scanner-stats {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.stat {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  color: var(--scan-text);
}

.stat-sep { color: #334433; font-size: 12px; }

.scanner-status {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  color: #88FFCC;
  margin-top: 4px;
}

.scanner-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.scanner-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

.panel-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  color: var(--scan-text);
  padding: 5px 10px;
  background: #111825;
  border-bottom: 1px solid var(--scan-text);
  flex-shrink: 0;
}

.candidates-scroll, .tree-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--scan-text);
}

/* Candidates table */
.cand-table {
  width: 100%;
  border-collapse: collapse;
}

.cand-table th {
  font-size: 10px;
  font-weight: 700;
  color: var(--muted);
  text-align: left;
  padding: 4px 6px;
  border-bottom: 1px solid #222;
  position: sticky;
  top: 0;
  background: var(--scan-bg);
}

.cand-table td {
  padding: 3px 6px;
  border-bottom: 1px solid #1a1a2a;
  color: var(--scan-text);
  font-size: 11px;
}

.cand-chosen {
  background: var(--yellow) !important;
  color: #000 !important;
  font-weight: 700;
}

/* Search tree nodes */
.tree-node {
  padding: 2px 0 2px 16px;
  position: relative;
}

.tree-node::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: #2a3040;
}

.tree-leaf {
  color: var(--scan-text);
  font-size: 11px;
  padding: 2px 0;
}

/* ═══════════════════════════════════════════════════════════════════
   MODALS
   ═══════════════════════════════════════════════════════════════════ */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-overlay.visible { display: flex; }

.modal-content {
  background: var(--surface);
  border: 1.5px solid var(--accent);
  border-radius: 16px;
  padding: 30px 36px;
  max-width: 640px;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 0 40px rgba(80,255,170,0.15);
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 20px;
  cursor: pointer;
  transition: color 0.15s;
}
.modal-close:hover { color: var(--red); }

.rules-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: #C8E6C9;
  white-space: pre-wrap;
}

/* Game Over Modal */
.game-over-content {
  text-align: center;
  min-width: 320px;
}

.game-over-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 24px;
}

.game-over-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.go-btn {
  padding: 10px 28px;
  border-radius: 20px;
  border: none;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  color: white;
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.2s;
}
.go-btn:hover { transform: scale(1.05); }

.play-again { background: #27AE60; }
.play-again:hover { box-shadow: 0 0 16px #27AE60; }

.go-menu { background: var(--blue); }
.go-menu:hover { box-shadow: 0 0 16px var(--blue); }

/* ─── SCROLLBAR ────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--scan-bg); }
::-webkit-scrollbar-thumb { background: #334433; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--scan-text); }

/* ─── RESPONSIVE ───────────────────────────────────────────────── */
@media (max-width: 900px) {
  .game-layout { flex-direction: column; }
  .game-left { flex: none; }
  .scanner { border-left: none; border-top: 1.5px solid var(--scan-text); max-height: 300px; }
  .selectors { flex-direction: column; align-items: center; }
}