/* ── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #1a1a2e;
  --surface: #16213e;
  --surface2: #0f3460;
  --border: #2a2a5a;
  --text: #e0e0f0;
  --text-muted: #7878a8;
  --warm: #ffb347;
  --warm-glow: rgba(255, 179, 71, 0.5);
  --cold: #cce8ff;
  --cold-glow: rgba(180, 220, 255, 0.5);
  --accent: #533483;
  --green: #4caf50;
  --orange: #ff9800;
  --red: #f44336;
  --radius: 16px;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

/* ── Header ───────────────────────────────────────────────── */
header {
  width: 100%;
  max-width: 480px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
}

#header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--red);
  flex-shrink: 0;
  transition: background 0.3s;
}

#status-text {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Toggle switch ────────────────────────────────────────── */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 28px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.toggle-track {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  background: var(--border);
  cursor: pointer;
  transition: background 0.25s;
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.25s;
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

.toggle-switch input:checked + .toggle-track {
  background: var(--green);
}

.toggle-switch input:checked + .toggle-track::after {
  transform: translateX(20px);
}

.toggle-switch input:focus-visible + .toggle-track {
  outline: 2px solid var(--cold);
  outline-offset: 2px;
}

/* ── Lights toggle in header ──────────────────────────────── */
.lights-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.lights-label {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ── Icon button ──────────────────────────────────────────── */
.icon-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}

.icon-btn svg { width: 22px; height: 22px; }
.icon-btn:hover, .icon-btn:active { background: var(--surface2); color: var(--text); }

/* ── Turn indicator ───────────────────────────────────────── */
#turn-indicator {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 6px 20px;
  border-radius: 20px;
  margin-bottom: 20px;
  transition: background 0.3s, color 0.3s;
  background: var(--surface);
  color: var(--text-muted);
}

#turn-indicator[data-player="1"] {
  background: rgba(255, 179, 71, 0.15);
  color: var(--warm);
}

#turn-indicator[data-player="2"] {
  background: rgba(180, 220, 255, 0.15);
  color: var(--cold);
}

/* ── Game board ───────────────────────────────────────────── */
#board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: min(90vw, 420px);
  aspect-ratio: 1;
  padding: 10px;
}

.cell {
  border-radius: var(--radius);
  background: var(--surface);
  border: 2px solid var(--border);
  cursor: pointer;
  transition: background 0.25s, border-color 0.25s, box-shadow 0.25s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
  position: relative;
  overflow: hidden;
}

.cell::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle at center, rgba(255,255,255,0.05), transparent 70%);
  opacity: 0;
  transition: opacity 0.2s;
}

.cell:hover:not([data-player]) { border-color: var(--accent); }
.cell:active:not([data-player]) { transform: scale(0.95); }

.cell[data-player="1"] {
  background: rgba(255, 179, 71, 0.18);
  border-color: var(--warm);
  box-shadow: 0 0 18px var(--warm-glow), inset 0 0 12px rgba(255,179,71,0.1);
  cursor: default;
}

.cell[data-player="1"]::before {
  content: '✕';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: clamp(30px, 8.5vw, 52px);
  font-weight: 800;
  line-height: 1;
  color: var(--warm);
  text-shadow: 0 0 14px var(--warm-glow);
  z-index: 1;
  pointer-events: none;
  user-select: none;
}

.cell[data-player="1"]::after { opacity: 1; }

.cell[data-player="2"] {
  background: rgba(180, 220, 255, 0.18);
  border-color: var(--cold);
  box-shadow: 0 0 18px var(--cold-glow), inset 0 0 12px rgba(180,220,255,0.1);
  cursor: default;
}

.cell[data-player="2"]::before {
  content: '○';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: clamp(30px, 8.5vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--cold);
  text-shadow: 0 0 14px var(--cold-glow);
  z-index: 1;
  pointer-events: none;
  user-select: none;
}

.cell[data-player="2"]::after { opacity: 1; }

/* Animation class used during start sequence */
.cell[data-anim-player="1"] {
  background: rgba(255, 179, 71, 0.12);
  border-color: rgba(255, 179, 71, 0.5);
  box-shadow: 0 0 12px rgba(255,179,71,0.3);
}

.cell[data-anim-player="2"] {
  background: rgba(180, 220, 255, 0.12);
  border-color: rgba(180, 220, 255, 0.5);
  box-shadow: 0 0 12px rgba(180,220,255,0.3);
}

/* ── Blinking animation ───────────────────────────────────── */
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.cell.blinking {
  animation: blink 1.2s ease-in-out infinite;
}

/* ── Result overlay ───────────────────────────────────────── */
#result-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 50;
  padding: 24px;
}

#result-overlay[hidden] { display: none; }

.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 36px 32px;
  text-align: center;
  max-width: 320px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

#result-text {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text);
}

.result-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.result-buttons button {
  flex: 1;
  border: none;
  border-radius: 12px;
  padding: 13px 16px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

#btn-new-game {
  background: var(--accent);
  color: #fff;
}

#btn-show-board {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border) !important;
}

.result-buttons button:hover { opacity: 0.85; }
.result-buttons button:active { transform: scale(0.97); }

/* Floating restart button shown after popup is dismissed */
#btn-restart-board {
  margin-top: 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 14px 36px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s, box-shadow 0.2s;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 4px 20px rgba(83, 52, 131, 0.5);
}

#btn-restart-board:hover { opacity: 0.9; }
#btn-restart-board:active { transform: scale(0.97); }
#btn-restart-board[hidden] { display: none; }

/* ── Config overlay ───────────────────────────────────────── */
#config-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 100;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

#config-overlay[hidden] { display: none; }

#config-form {
  background: var(--surface);
  border-radius: 24px 24px 0 0;
  width: 100%;
  max-width: 480px;
  padding: 20px 20px 40px;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

.config-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.config-header h2 {
  font-size: 20px;
  font-weight: 700;
}

.close-btn svg { width: 20px; height: 20px; }

.config-section {
  margin-bottom: 20px;
  padding: 16px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.config-section h3 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.config-section label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
}

.config-section label:last-child { border-bottom: none; padding-bottom: 0; }
.config-section label:first-of-type { padding-top: 0; }

.config-section label span { flex: 1; }

.config-section input[type="text"],
.config-section input[type="number"] {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 15px;
  width: 140px;
  text-align: right;
}

.config-section input[type="text"]:focus,
.config-section input[type="number"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  cursor: pointer;
  user-select: none;
  font-size: 15px;
}

.toggle-row span { flex: 1; }

.config-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* ── Bulb name grid ───────────────────────────────────────── */
.bulb-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.bulb-grid input {
  background: var(--surface2) !important;
  border: 1px solid var(--border) !important;
  color: var(--text) !important;
  border-radius: 8px !important;
  padding: 8px 6px !important;
  font-size: 11px !important;
  width: 100% !important;
  text-align: center !important;
}

.bulb-grid input:focus {
  outline: 2px solid var(--accent) !important;
}

/* ── Config buttons ───────────────────────────────────────── */
.config-buttons {
  margin-top: 8px;
}

.btn-primary {
  width: 100%;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 16px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary:hover { opacity: 0.9; }
.btn-primary:active { transform: scale(0.98); }

/* ── Player color labels ──────────────────────────────────── */
.player1-label { color: var(--warm); }
.player2-label { color: var(--cold); }

/* ── Help button (inline in section header) ──────────────── */
.help-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 50%;
  width: 20px;
  height: 20px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  margin-left: 8px;
  vertical-align: middle;
  line-height: 1;
  transition: background 0.2s, color 0.2s;
}
.help-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ── Help overlay ─────────────────────────────────────────── */
#help-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 110;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

#help-overlay[hidden] { display: none; }

#help-content {
  background: var(--surface);
  border-radius: 24px 24px 0 0;
  width: 100%;
  max-width: 480px;
  padding: 20px 20px 48px;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

/* ── Steps ────────────────────────────────────────────────── */
.help-step {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.help-step:last-child { border-bottom: none; margin-bottom: 0; }

.step-num {
  width: 32px;
  height: 32px;
  min-width: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  margin-top: 2px;
}

.step-body h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.step-body p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 8px;
  line-height: 1.5;
}

.step-body ol {
  font-size: 14px;
  color: var(--text-muted);
  padding-left: 18px;
  margin-bottom: 8px;
  line-height: 1.7;
}

.step-body ol li strong { color: var(--text); }
.step-body ol li em    { color: var(--text-muted); }

.code-block {
  background: #0a0a1a;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: #a8d8a8;
  white-space: pre;
  overflow-x: auto;
  margin: 6px 0 10px;
  line-height: 1.6;
}

.step-body code {
  background: #0a0a1a;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: #a8d8a8;
}

.help-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 4px;
}

.help-table td {
  padding: 7px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  color: var(--text-muted);
  line-height: 1.5;
}

.help-table td:first-child {
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
  width: 80px;
}

.help-table tr:last-child td { border-bottom: none; }

/* ── Toast ────────────────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: calc(24px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: rgba(30, 30, 60, 0.95);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 20px;
  font-size: 14px;
  white-space: nowrap;
  pointer-events: none;
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  z-index: 200;
  backdrop-filter: blur(4px);
}

#toast.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}