:root, [data-theme="light"] {
  /* Base */
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --panel: #ffffff;
  --panel-border: #e5e7eb;
  --text: #0a0a0a;
  --text-soft: #404040;
  --text-muted: #6b7280;

  /* Accent (bluish green) */
  --accent: #06d6a0;
  --accent-hover: #05b88a;
  --accent-soft: #d1fae5;

  /* Lines */
  --line-empty: #e5e7eb;
  --line-hover: #9ca3af;
  --line-drawn: #0a0a0a;
  --line-pending: #fbbf24;
  --line-last: #06d6a0;
  --dot: #0a0a0a;

  /* Misc */
  --danger: #ef4444;
  --shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.08);
  --radius: 12px;
  --radius-sm: 6px;
}
[data-theme="dark"] {
  --bg: #0a0a0a;
  --bg-soft: #18181b;
  --panel: #131316;
  --panel-border: #27272a;
  --text: #fafafa;
  --text-soft: #d4d4d8;
  --text-muted: #71717a;
  --accent-soft: rgba(6,214,160,0.18);
  --line-empty: #2a2a2e;
  --line-hover: #52525b;
  --line-drawn: #fafafa;
  --dot: #fafafa;
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.6);
}
[data-theme="dark"] button { background: var(--text); color: var(--bg); border-color: var(--text); }
[data-theme="dark"] button:hover:not(:disabled) { background: #e4e4e7; border-color: #e4e4e7; }
[data-theme="dark"] button.ghost { background: transparent; color: var(--text-soft); border-color: var(--panel-border); }
[data-theme="dark"] button.ghost:hover { background: #27272a; color: var(--text); border-color: #3f3f46; }
[data-theme="dark"] button.accent { background: var(--accent); color: #04321f; border-color: var(--accent); }
[data-theme="dark"] button.accent:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
[data-theme="dark"] .warning { background: rgba(251,191,36,0.08); border-color: rgba(251,191,36,0.3); color: #fcd34d; }
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-feature-settings: 'cv11';
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 16px 64px;
  -webkit-font-smoothing: antialiased;
}

/* Brand / logo */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
  position: relative;
}
.brand-logo { width: 40px; height: 40px; flex-shrink: 0; }
.brand-text {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}
.theme-toggle {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 999px;
  padding: 0;
  margin-left: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
}
.theme-toggle:hover { background: var(--bg-soft); color: var(--text); border-color: var(--text-muted); }
.theme-toggle svg { width: 18px; height: 18px; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -0.02em; color: var(--text); }
h2 { font-size: 20px; }
h3 { font-size: 14px; font-weight: 600; color: var(--text-muted); }

/* Panels */
.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  padding: 24px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 640px;
}
.panel.narrow { max-width: 440px; }

/* Buttons */
button, .btn {
  background: var(--text);
  color: var(--bg);
  border: 1px solid var(--text);
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.05s;
}
button:hover:not(:disabled), .btn:hover { background: #262626; border-color: #262626; }
button:active:not(:disabled) { transform: translateY(1px); }
button:disabled { opacity: 0.4; cursor: not-allowed; }
button.ghost {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--text-soft);
  font-weight: 500;
}
button.ghost:hover { background: var(--bg-soft); color: var(--text); border-color: #d1d5db; }
button.accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #04321f;
}
button.accent:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

/* Form inputs */
input[type=text], select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
}
input[type=text]:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
label.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.spacer { flex: 1; }

.name-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.name-row button { padding: 10px 22px; }
@media (max-width: 480px) {
  .name-row button { flex: 1; }
}
.muted { color: var(--text-muted); font-size: 14px; line-height: 1.6; margin: 0; }

/* Landing */
.landing-actions { display: flex; flex-direction: column; gap: 12px; }
.landing-actions .or {
  text-align: center;
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin: 2px 0;
}
.landing-actions form { display: flex; gap: 8px; }
.landing-actions form input { flex: 1; text-transform: lowercase; }
.error { color: var(--danger); font-size: 13px; margin-top: 6px; }

/* How to play */
.how-to-play ol {
  margin: 12px 0 0;
  padding-left: 22px;
  color: var(--text-soft);
  line-height: 1.7;
  font-size: 14px;
}
.how-to-play li { margin-bottom: 4px; }
.how-to-play strong { color: var(--text); font-weight: 600; }
.accent-text { color: var(--accent-hover); }

/* Room-code badge */
.room-code-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 5px 8px 5px 14px;
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}
.room-code-badge code {
  font-family: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 14px;
}
.room-code-copy {
  background: transparent;
  border: none;
  padding: 4px 8px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  border-radius: 999px;
}
.room-code-copy:hover { color: var(--accent-hover); background: transparent; transform: none; }

/* Lobby */
.player-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 4px;
  border-bottom: 1px solid var(--panel-border);
}
.player-row:last-child { border-bottom: none; }
.swatch { width: 14px; height: 14px; border-radius: 4px; flex-shrink: 0; }
.player-row-name { font-weight: 600; flex: 1; }
.badge {
  font-size: 11px;
  background: var(--text);
  color: var(--bg);
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.5px;
  font-weight: 600;
}
.badge.muted { background: var(--bg-soft); color: var(--text-muted); border: 1px solid var(--panel-border); }
.warning {
  background: #fffbeb;
  border: 1px solid #fde68a;
  color: #92400e;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-top: 12px;
}

/* Scoreboard */
.scoreboard { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.player-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  border: 2px solid var(--panel-border);
  min-width: 150px;
  transition: all 0.2s;
}
.player-card.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  animation: pulse 1.8s ease-in-out infinite;
}
.player-card.afk { opacity: 0.45; }
.player-card .player-score { margin-left: auto; font-size: 18px; font-weight: 700; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(6,214,160,0.18); }
  50%      { box-shadow: 0 0 0 6px rgba(6,214,160,0.32); }
}

/* Board */
#board-wrapper {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  padding: 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: inline-block;
  max-width: 100%;
}
svg#board { display: block; max-width: 100%; height: auto; }
.dot { fill: var(--dot); }
.line-hit { stroke: transparent; stroke-width: 18; cursor: pointer; }
.line {
  stroke: var(--line-empty);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 2 6;
  pointer-events: none;
  transition: stroke 0.15s, stroke-width 0.15s;
}
.line-group.locked .line-hit { cursor: not-allowed; }
.line-group:not(.drawn):not(.locked):hover .line {
  stroke: var(--line-hover);
  stroke-width: 5;
  stroke-dasharray: none;
}
.line.drawn {
  stroke: var(--line-drawn);
  stroke-width: 5;
  stroke-dasharray: none;
}
.line.pending {
  stroke: var(--line-pending);
  stroke-width: 6;
  stroke-dasharray: 6 4;
  animation: dash 0.6s linear infinite;
  opacity: 0.85;
}
@keyframes dash { to { stroke-dashoffset: -20; } }
.line.last-move {
  stroke: var(--line-last);
  stroke-width: 6;
  filter: drop-shadow(0 0 5px rgba(6,214,160,0.55));
}
.box-fill { transition: fill 0.3s; }
.box-label {
  font-weight: 700;
  font-size: 18px;
  fill: rgba(0,0,0,0.55);
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
  user-select: none;
  font-family: inherit;
}

.status {
  margin-top: 12px;
  font-size: 15px;
  color: var(--text-muted);
  min-height: 22px;
  text-align: center;
  font-weight: 500;
}
.winner-banner {
  margin-top: 8px;
  padding: 18px 24px;
  border-radius: var(--radius);
  background: var(--accent);
  color: #04321f;
  font-weight: 700;
  font-size: 18px;
  text-align: center;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

#connection-status {
  position: fixed;
  top: 14px;
  right: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

@media (max-width: 640px) {
  body { padding: 20px 14px 48px; }
  .brand-text { font-size: 20px; }
  .panel { padding: 18px; }
  .player-card { min-width: 0; flex: 1 1 calc(50% - 10px); padding: 8px 12px; }
  .room-code-badge { padding: 4px 6px 4px 10px; font-size: 12px; }
}