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

:root {
  --bg: #1a1a2e;
  --surface: #16213e;
  --card: #0f3460;
  --accent: #e94560;
  --accent2: #4ecca3;
  --text: #eaeaea;
  --muted: #8888aa;
  --win: #4ecca3;
  --loss: #e94560;
  --draw: #f5a623;
  --border: #2a2a4a;
  --board-size: min(480px, 90vw);
}

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

a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Navbar */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 56px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.nav-brand {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 1px;
}
.nav-links { display: flex; align-items: center; gap: 1.2rem; }
.btn-link {
  background: none;
  border: none;
  color: var(--accent2);
  cursor: pointer;
  font-size: 1rem;
  padding: 0;
}
.btn-link:hover { text-decoration: underline; }

.container { max-width: 1100px; margin: 0 auto; padding: 2rem 1rem; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.55rem 1.4rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: opacity 0.15s;
}
.btn:hover { opacity: 0.85; }
.btn-primary  { background: var(--accent);  color: #fff; }
.btn-secondary{ background: var(--card);    color: var(--text); border: 1px solid var(--border); }
.btn-danger   { background: #b00020;        color: #fff; }
.btn-large    { padding: 0.8rem 2rem; font-size: 1.05rem; }

/* Hero */
.hero {
  text-align: center;
  padding: 4rem 1rem;
}
.hero h1 { font-size: 2.8rem; margin-bottom: 1rem; }
.hero p  { color: var(--muted); margin-bottom: 2rem; font-size: 1.1rem; }
.matchmaking-section { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
#queue-status { color: var(--accent2); font-size: 1rem; animation: pulse 1.5s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.5} }

/* Forms */
.form-container {
  max-width: 400px;
  margin: 3rem auto;
  background: var(--surface);
  padding: 2rem;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.form-container h2 { margin-bottom: 1.5rem; text-align: center; }
.form-container label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
}
.form-container input {
  padding: 0.6rem 0.8rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text);
  font-size: 1rem;
}
.form-container input:focus { outline: 2px solid var(--accent2); }
.form-container .btn { width: 100%; margin-top: 0.5rem; text-align: center; }
.form-container p  { margin-top: 1rem; text-align: center; color: var(--muted); }
.error { background: #3a0010; color: var(--loss); padding: 0.6rem; border-radius: 5px; margin-bottom: 1rem; }

/* Game layout */
.game-layout {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  justify-content: center;
  flex-wrap: wrap;
}
.game-left { display: flex; flex-direction: column; gap: 0.8rem; }
.chess-board { width: var(--board-size) !important; height: var(--board-size) !important; }
.chess-board .square-55d63 { cursor: pointer; }
.chess-board .square-selected {
  box-shadow: inset 0 0 0 4px var(--accent2);
}
.floating-piece {
  position: fixed;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.92;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
  transform: translateZ(0);
}
.player-info {
display: flex;
align-items: center;
gap: 0.8rem;
font-size: 1rem;
font-weight: 600;
padding: 0.5rem 0.8rem;
border-radius: 6px;
transition: background-color 0.2s, box-shadow 0.2s;
}
.player-info.active-turn {
background: var(--accent2);
color: var(--bg);
box-shadow: 0 0 12px rgba(78, 204, 163, 0.4);
}
.player-info.active-turn .elo-badge {
background: var(--bg);
color: var(--accent2);
}
.elo-badge {
  background: var(--card);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 0.85rem;
  color: var(--accent2);
}
.elo-badge.large { font-size: 1.2rem; padding: 4px 14px; }
.game-controls { display: flex; gap: 0.6rem; }
.status-bar {
  min-height: 28px;
  font-size: 0.9rem;
  color: var(--accent2);
  font-style: italic;
}

/* Move list */
.game-right {
  width: 220px;
  background: var(--surface);
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow: hidden;
}
.move-list-header {
  background: var(--card);
  padding: 0.6rem 1rem;
  font-weight: 700;
  font-size: 0.9rem;
}
.move-list {
  padding: 0.5rem;
  max-height: 500px;
  overflow-y: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.88rem;
  line-height: 1.8;
}
.move-pair { display: flex; gap: 0.3rem; }
.move-num { color: var(--muted); min-width: 28px; }
.move-white, .move-black { padding: 1px 4px; border-radius: 3px; cursor: default; }
.move-white:hover, .move-black:hover { background: var(--card); }

/* Modal */
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 999;
}
.modal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.5rem;
  text-align: center;
  max-width: 400px;
}
.modal-content h2 { margin-bottom: 0.8rem; font-size: 1.8rem; }
.modal-content p  { margin-bottom: 1.5rem; color: var(--muted); }

/* Profile */
.profile-container { max-width: 800px; margin: 0 auto; }
.profile-header {
  display: flex; align-items: center; gap: 1rem;
  margin-bottom: 2rem;
}
.profile-header h2 { font-size: 2rem; }
.game-table { width: 100%; border-collapse: collapse; margin-top: 0.5rem; }
.game-table th {
  text-align: left; padding: 0.6rem 0.8rem;
  background: var(--card); color: var(--muted); font-size: 0.85rem;
}
.game-table td { padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--border); }
.result-win  .result-cell { color: var(--win); font-weight: 700; }
.result-loss .result-cell { color: var(--loss); font-weight: 700; }
.result-draw .result-cell { color: var(--draw); font-weight: 700; }
.elo-change { font-weight: 700; }
.result-win .elo-change { color: var(--win); }
.result-loss .elo-change { color: var(--loss); }
.result-draw .elo-change { color: var(--draw); }

/* Lobby */
.lobby-container { max-width: 700px; margin: 0 auto; }
.lobby-container h2 { margin-bottom: 1.5rem; }
.lobby-container h3 { margin-bottom: 1rem; color: var(--accent2); }
.my-lobby {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}
.create-lobby {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}
.create-lobby form {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.create-lobby label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
}
.create-lobby select {
  padding: 0.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text);
  font-size: 1rem;
}
.lobby-list {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.lobby-items { list-style: none; }
.lobby-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem;
  background: var(--bg);
  border-radius: 6px;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.lobby-host { flex: 1; }
.lobby-color { color: var(--muted); font-size: 0.9rem; }
.no-lobbies { color: var(--muted); text-align: center; padding: 1rem; }
.loader {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--accent2);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Leaderboard */
.leaderboard-container { max-width: 800px; margin: 0 auto; }
.leaderboard-container h2 { margin-bottom: 1.5rem; }
.leaderboard-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.tab {
  padding: 0.6rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
  font-weight: 600;
  transition: all 0.15s;
}
.tab:hover { text-decoration: none; background: var(--card); color: var(--text); }
.tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border-radius: 8px;
  overflow: hidden;
}
.leaderboard-table th {
  background: var(--card);
  padding: 0.8rem;
  text-align: left;
  font-size: 0.85rem;
  color: var(--muted);
}
.leaderboard-table td {
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid var(--border);
}
.leaderboard-table tr:last-child td { border-bottom: none; }
.leaderboard-table tr:hover td { background: var(--bg); }
.rank { font-weight: 700; color: var(--accent2); width: 50px; }
.player a { color: var(--text); font-weight: 600; }
.player a:hover { color: var(--accent2); }
.elo { color: var(--accent2); font-weight: 700; }
.wins { color: var(--win); }
.losses { color: var(--loss); }
.draws { color: var(--draw); }
.winrate { color: var(--muted); }
.no-games { text-align: center; color: var(--muted); padding: 2rem; }