* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #0e0e10;
  color: #ddd;
}

#app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 20px 24px;
}

header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid #333;
  margin-bottom: 16px;
}

header h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.5px;
}

#status {
  flex: 1;
  font-size: 16px;
  color: #c0e8ff;
}

#reset {
  background: #2c3e50;
  color: #fff;
  border: 1px solid #4a6480;
  padding: 8px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
}

#reset:hover { background: #3a516b; }

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 24px;
  align-items: start;
}

#lobby {
  background: #18181b;
  border: 1px solid #2a2a2c;
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.lobby-modes {
  flex: 1 1 auto;
  min-width: 0;
}
.lobby-settings {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: #aaa;
  white-space: nowrap;
  flex-shrink: 0;
}
.setting {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
}
.setting input[type="checkbox"] {
  margin: 0;
  cursor: pointer;
}
.setting-group {
  gap: 8px;
}
.setting-label { color: #aaa; }
.radio-opt {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  user-select: none;
}
.radio-opt input[type="radio"] {
  margin: 0;
  cursor: pointer;
}
.lobby-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 14px;
}
.lobby-row.hidden { display: none; }
.lobby-label { color: #aaa; }
.lobby-label strong { color: #fff; }
.lobby-divider { color: #555; padding: 0 4px; }
.lobby-btn {
  background: #2c3e50;
  color: #fff;
  border: 1px solid #4a6480;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}
.lobby-btn:hover { background: #3a516b; }
.lobby-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
#join-code {
  background: #0e0e10;
  color: #fff;
  border: 1px solid #4a6480;
  padding: 6px 10px;
  border-radius: 4px;
  width: 90px;
  font-size: 14px;
  letter-spacing: 4px;
  text-transform: uppercase;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}
#room-code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  letter-spacing: 3px;
  color: #c0e8ff;
}
#lobby-msg {
  color: #ff7080;
  font-size: 13px;
}
#lobby-msg.ok { color: #80d090; }

#board-area {
  min-width: 0;
}

#board {
  display: block;
  background: #161618;
  border: 1px solid #2a2a2c;
  border-radius: 6px;
  max-width: 100%;
  height: auto;
}

#legend {
  margin-top: 10px;
  font-size: 12px;
  color: #888;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 4px;
  vertical-align: middle;
}
.dot-white-control { background: #b8d088; }
.dot-black-control { background: #c98080; }
.dot-slide { background: #4a90c8; }

#captured {
  margin-top: 14px;
  font-size: 18px;
  display: grid;
  gap: 4px;
}
#captured strong {
  font-size: 12px;
  color: #888;
  display: inline-block;
  width: 150px;
  font-weight: 500;
}

#sidebar section {
  margin-bottom: 22px;
  background: #18181b;
  border: 1px solid #2a2a2c;
  padding: 14px;
  border-radius: 6px;
}

#sidebar h3 {
  margin: 0 0 10px;
  font-size: 14px;
  color: #c0e8ff;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.values {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
}
.values li {
  display: flex;
  justify-content: space-between;
  padding: 3px 0;
  border-bottom: 1px solid #232326;
}
.values li:last-child { border-bottom: none; }

.note {
  font-size: 12px;
  color: #888;
  margin: 10px 0 0;
  line-height: 1.4;
}

.howto {
  margin: 0;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.5;
  color: #bbb;
}
.howto li { margin-bottom: 4px; }

#history {
  margin: 0;
  padding-left: 22px;
  font-size: 13px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  color: #bbb;
  max-height: 280px;
  overflow-y: auto;
}
#history li { padding: 2px 0; }

#banner {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #2c3e50;
  color: #fff;
  padding: 24px 40px;
  border-radius: 8px;
  font-size: 22px;
  border: 2px solid #c0e8ff;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
  z-index: 100;
  text-align: center;
}
#banner.hidden { display: none; }
#banner button {
  display: block;
  margin: 14px auto 0;
  background: #4a90c8;
  color: #fff;
  border: none;
  padding: 8px 18px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
}

@media (max-width: 1100px) {
  main { grid-template-columns: 1fr; }
}