/* Voyager Checkers — base tokens + free skins */

:root,
[data-skin="classic"] {
  --bg: #0f1419;
  --panel: #1a2332;
  --panel-border: #2a3a4f;
  --text: #e8eef6;
  --muted: #8b9cb3;
  --accent: #3d8bfd;
  --accent-hover: #5ca0ff;
  --danger: #e85d5d;
  --danger-hover: #ff7070;
  --success: #3ecf8e;
  --dark-sq: #4a3728;
  --light-sq: #d4b896;
  --board-edge: #2c2118;
  --piece-dark: #1a1a1a;
  --piece-light: #f5f0e6;
  --piece-dark-hi: #3a3a3a;
  --piece-light-hi: #fffef8;
  --piece-dark-border: #0a0a0a;
  --piece-light-border: #c4b8a0;
  --king-dark: #d4af37;
  --king-light: #8b6914;
  --highlight: rgba(61, 139, 253, 0.55);
  --selected: rgba(62, 207, 142, 0.65);
  --capture-ring: #ffb020;
  --turn-yours-bg: rgba(62, 207, 142, 0.18);
  --turn-yours-border: rgba(62, 207, 142, 0.55);
  --turn-theirs-bg: rgba(139, 156, 179, 0.12);
  --turn-theirs-border: rgba(139, 156, 179, 0.35);
  --turn-wait-bg: rgba(61, 139, 253, 0.12);
  --turn-wait-border: rgba(61, 139, 253, 0.4);
  --glow-yours: 0 0 0 2px rgba(62, 207, 142, 0.45), 0 0 28px rgba(62, 207, 142, 0.2);
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "SF Mono", monospace;
}

/* Terminal — matches shop terminal theme */
[data-skin="terminal"] {
  --bg: #000000;
  --panel: #0d0d0d;
  --panel-border: rgba(0, 255, 136, 0.22);
  --text: #e8ffe8;
  --muted: #7a9a7a;
  --accent: #00ff88;
  --accent-hover: #33ffaa;
  --danger: #ff6b6b;
  --danger-hover: #ff8888;
  --success: #00ff88;
  --dark-sq: #0a1a12;
  --light-sq: #122a1c;
  --board-edge: #00ff88;
  --piece-dark: #003d22;
  --piece-light: #b8ffd4;
  --piece-dark-hi: #006633;
  --piece-light-hi: #e8fff0;
  --piece-dark-border: #00ff88;
  --piece-light-border: #4a8a62;
  --king-dark: #f5c542;
  --king-light: #00cc6a;
  --highlight: rgba(0, 255, 136, 0.45);
  --selected: rgba(0, 255, 136, 0.55);
  --capture-ring: #f5c542;
  --turn-yours-bg: rgba(0, 255, 136, 0.14);
  --turn-yours-border: rgba(0, 255, 136, 0.55);
  --turn-theirs-bg: rgba(122, 154, 122, 0.12);
  --turn-theirs-border: rgba(122, 154, 122, 0.35);
  --turn-wait-bg: rgba(0, 255, 136, 0.08);
  --turn-wait-border: rgba(0, 255, 136, 0.35);
  --glow-yours: 0 0 0 2px rgba(0, 255, 136, 0.5), 0 0 24px rgba(0, 255, 136, 0.22);
  --shadow: 0 0 0 1px rgba(0, 255, 136, 0.08), 0 8px 28px rgba(0, 0, 0, 0.55);
  --font: "IBM Plex Mono", "JetBrains Mono", ui-monospace, monospace;
}

/* Midnight — cool blue / violet */
[data-skin="midnight"] {
  --bg: #0a0a14;
  --panel: #12122a;
  --panel-border: #2a2a55;
  --text: #eef0ff;
  --muted: #9090b8;
  --accent: #8b7cff;
  --accent-hover: #a89bff;
  --danger: #ff6b9d;
  --danger-hover: #ff8ab3;
  --success: #5ce1e6;
  --dark-sq: #1a1a3a;
  --light-sq: #2d2d5c;
  --board-edge: #5c4dff;
  --piece-dark: #0d0d1a;
  --piece-light: #e8e6ff;
  --piece-dark-hi: #2a2a4a;
  --piece-light-hi: #ffffff;
  --piece-dark-border: #6b5cff;
  --piece-light-border: #a8a0e0;
  --king-dark: #ffd166;
  --king-light: #8b7cff;
  --highlight: rgba(139, 124, 255, 0.5);
  --selected: rgba(92, 225, 230, 0.55);
  --capture-ring: #ff6b9d;
  --turn-yours-bg: rgba(92, 225, 230, 0.14);
  --turn-yours-border: rgba(92, 225, 230, 0.5);
  --turn-theirs-bg: rgba(144, 144, 184, 0.12);
  --turn-theirs-border: rgba(144, 144, 184, 0.35);
  --turn-wait-bg: rgba(139, 124, 255, 0.12);
  --turn-wait-border: rgba(139, 124, 255, 0.4);
  --glow-yours: 0 0 0 2px rgba(92, 225, 230, 0.45), 0 0 28px rgba(139, 124, 255, 0.25);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

/* Bitcoin — premium (Lightning unlock) · ₿ on every piece */
[data-skin="bitcoin"] {
  --bg: #0d0a06;
  --panel: #1a140c;
  --panel-border: rgba(247, 147, 26, 0.4);
  --text: #fff8f0;
  --muted: #c4a882;
  --accent: #f7931a;
  --accent-hover: #ffb040;
  --danger: #ff5c5c;
  --danger-hover: #ff7a7a;
  --success: #f7931a;
  --dark-sq: #2a1a08;
  --light-sq: #e8a84a;
  --board-edge: #f7931a;
  --piece-dark: #1a1008;
  --piece-light: #fff4e0;
  --piece-dark-hi: #3d2810;
  --piece-light-hi: #ffffff;
  --piece-dark-border: #f7931a;
  --piece-light-border: #c97812;
  --king-dark: #ffd280;
  --king-light: #f7931a;
  --highlight: rgba(247, 147, 26, 0.5);
  --selected: rgba(255, 210, 128, 0.55);
  --capture-ring: #ffe0a0;
  --turn-yours-bg: rgba(247, 147, 26, 0.16);
  --turn-yours-border: rgba(247, 147, 26, 0.55);
  --turn-theirs-bg: rgba(196, 168, 130, 0.12);
  --turn-theirs-border: rgba(196, 168, 130, 0.35);
  --turn-wait-bg: rgba(247, 147, 26, 0.1);
  --turn-wait-border: rgba(247, 147, 26, 0.4);
  --glow-yours: 0 0 0 2px rgba(247, 147, 26, 0.5), 0 0 28px rgba(247, 147, 26, 0.28);
  --shadow: 0 0 0 1px rgba(247, 147, 26, 0.15), 0 8px 32px rgba(0, 0, 0, 0.55);
}

body[data-skin="bitcoin"] {
  background:
    radial-gradient(ellipse 70% 50% at 50% -5%, rgba(247, 147, 26, 0.14), transparent 55%),
    radial-gradient(ellipse 50% 40% at 100% 100%, rgba(247, 147, 26, 0.06), transparent 50%),
    var(--bg);
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background:
    radial-gradient(ellipse at 20% 0%, color-mix(in srgb, var(--accent) 18%, transparent) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, color-mix(in srgb, var(--panel) 80%, transparent) 0%, transparent 45%),
    var(--bg);
  color: var(--text);
  line-height: 1.45;
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  touch-action: manipulation;
}

body[data-skin="terminal"] {
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(0, 255, 136, 0.07), transparent 55%),
    var(--bg);
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem 1rem 2.5rem;
  padding-bottom: max(2.5rem, env(safe-area-inset-bottom));
}

.header {
  text-align: center;
  margin-bottom: 1.25rem;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.header-top .back-link {
  margin: 0;
  text-align: left;
}

.login-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 36px;
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  white-space: nowrap;
}

.login-nav-btn.is-logged-in {
  border-color: var(--accent);
  color: var(--accent);
}

.login-bolt {
  color: #f5c542;
}

.account-hint {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.account-hint.ok {
  color: var(--success);
}

.unlock-account-note {
  margin: 0 0 0.85rem;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.4;
}

.unlock-account-note a {
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
}

.login-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.login-actions .btn {
  width: 100%;
}

.login-key-display {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  word-break: break-all;
  background: color-mix(in srgb, var(--bg) 80%, #000);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin: 0;
}

.login-qr {
  margin: 0.75rem auto;
}

.header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.back-link {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
}

.back-link a {
  color: var(--muted);
  text-decoration: none;
}

.back-link a:hover {
  color: var(--accent);
}

.subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---- Skin picker ---- */

.skin-picker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 0.75rem;
  margin: 0 auto 1.25rem;
  max-width: 520px;
  padding: 0.55rem 0.75rem;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.skin-picker-label {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.skin-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
}

.skin-option {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  border: 1px solid var(--panel-border);
  background: transparent;
  color: var(--muted);
  padding: 0.4rem 0.65rem;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: inherit;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  min-height: 36px;
}

.skin-option:hover {
  color: var(--text);
  border-color: var(--accent);
}

.skin-option[aria-pressed="true"] {
  color: var(--text);
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 30%, transparent);
}

.skin-swatch {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  flex-shrink: 0;
  background:
    linear-gradient(135deg, var(--sw-a) 50%, var(--sw-b) 50%);
}

.skin-swatch.classic {
  --sw-a: #4a3728;
  --sw-b: #d4b896;
}

.skin-swatch.terminal {
  --sw-a: #0a1a12;
  --sw-b: #00ff88;
}

.skin-swatch.midnight {
  --sw-a: #1a1a3a;
  --sw-b: #8b7cff;
}

.skin-swatch.bitcoin {
  --sw-a: #2a1a08;
  --sw-b: #f7931a;
  box-shadow: 0 0 6px rgba(247, 147, 26, 0.45);
}

.skin-option.premium {
  position: relative;
}

.skin-option.premium .skin-lock {
  font-size: 0.7rem;
  line-height: 1;
  opacity: 0.9;
}

.skin-option.premium.is-unlocked .skin-lock {
  display: none;
}

.skin-option.premium:not(.is-unlocked) {
  border-style: dashed;
}

.skin-option.premium:not(.is-unlocked)[aria-pressed="true"] {
  /* locked skins shouldn't stay "pressed" while modal opens */
}

/* ---- Lobby ---- */

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  max-width: 420px;
  margin: 0 auto;
}

.lobby h2 {
  margin: 0 0 1.25rem;
  font-size: 1.25rem;
}

.lobby-actions {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.lobby-actions .btn {
  flex: 1;
  min-height: 44px;
}

.join-row {
  display: flex;
  gap: 0.5rem;
}

.join-row input {
  flex: 1;
  min-width: 0;
  min-height: 44px;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: color-mix(in srgb, var(--bg) 80%, #000);
  color: var(--text);
  font-size: 1rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.join-row input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.btn {
  cursor: pointer;
  border: 1px solid var(--panel-border);
  background: color-mix(in srgb, var(--panel) 70%, #000);
  color: var(--text);
  padding: 0.65rem 1rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  transition: background 0.15s, transform 0.1s, border-color 0.15s;
  min-height: 44px;
}

.btn:hover:not(:disabled) {
  border-color: var(--accent);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn.primary {
  background: var(--accent);
  border-color: transparent;
  color: #fff;
}

[data-skin="terminal"] .btn.primary {
  color: #000;
}

.btn.primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn.danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}

.btn.danger:hover:not(:disabled) {
  background: color-mix(in srgb, var(--danger) 15%, transparent);
  color: var(--danger-hover);
}

.status-line {
  margin: 1rem 0 0;
  min-height: 1.4em;
  color: var(--muted);
  font-size: 0.9rem;
}

.status-line.error {
  color: var(--danger);
}

.status-line.ok {
  color: var(--success);
}

.hidden {
  display: none !important;
}

/* ---- Game layout ---- */

.game {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  justify-content: center;
  align-items: flex-start;
}

.sidebar {
  width: 240px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  order: 1;
}

.board-column {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  order: 2;
  min-width: 0;
  width: min(100%, 520px);
}

.info-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
}

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
  gap: 0.5rem;
}

.info-row + .info-row {
  border-top: 1px solid var(--panel-border);
}

.label {
  color: var(--muted);
  font-size: 0.85rem;
}

.value {
  font-weight: 600;
  text-transform: capitalize;
}

.value.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.you-are::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 0.4rem;
  vertical-align: middle;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: var(--you-color, transparent);
}

.you-are.dark {
  --you-color: var(--piece-dark);
  color: var(--text);
}

.you-are.light {
  --you-color: var(--piece-light);
  color: var(--text);
}

.message {
  margin: 0;
  min-height: 2.5em;
  font-size: 0.9rem;
  color: var(--muted);
}

.message.error {
  color: var(--danger);
}

.message.ok {
  color: var(--success);
}

.game-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.game-actions .btn {
  flex: 1;
  min-width: 5.5rem;
}

.share-row {
  display: flex;
  gap: 0.5rem;
}

.share-row .btn {
  flex: 1;
  font-size: 0.85rem;
  min-height: 40px;
}

.share-status {
  margin: 0;
  min-height: 1.2em;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

.share-status.ok {
  color: var(--success);
}

.share-status.error {
  color: var(--danger);
}

.lobby-hint {
  margin: 0.75rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.35;
}

.legend {
  font-size: 0.82rem;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.legend .hint {
  margin-top: 0.4rem;
  line-height: 1.35;
}

.swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  vertical-align: middle;
  margin-right: 0.4rem;
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.swatch.dark {
  background: var(--piece-dark);
}

.swatch.light {
  background: var(--piece-light);
}

/* ---- Turn banner ---- */

.turn-banner {
  width: 100%;
  text-align: center;
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--turn-wait-border);
  background: var(--turn-wait-bg);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s, color 0.2s;
}

.turn-banner.yours {
  border-color: var(--turn-yours-border);
  background: var(--turn-yours-bg);
  color: var(--success);
  box-shadow: var(--glow-yours);
  animation: turn-pulse 1.6s ease-in-out infinite;
}

.turn-banner.theirs {
  border-color: var(--turn-theirs-border);
  background: var(--turn-theirs-bg);
  color: var(--muted);
  animation: none;
}

.turn-banner.waiting {
  border-color: var(--turn-wait-border);
  background: var(--turn-wait-bg);
  color: var(--accent);
  animation: none;
}

.turn-banner.over {
  border-color: var(--panel-border);
  background: var(--panel);
  color: var(--text);
  animation: none;
}

.turn-banner.over.win {
  color: var(--success);
  border-color: var(--turn-yours-border);
  background: var(--turn-yours-bg);
}

.turn-banner.over.lose {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 45%, transparent);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
}

@keyframes turn-pulse {
  0%,
  100% {
    box-shadow: var(--glow-yours);
  }
  50% {
    box-shadow:
      0 0 0 2px color-mix(in srgb, var(--success) 30%, transparent),
      0 0 12px color-mix(in srgb, var(--success) 12%, transparent);
  }
}

/* ---- Board ---- */

.board-wrap {
  padding: 10px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 520px;
  transition: box-shadow 0.25s ease;
}

.board-wrap.your-turn {
  box-shadow: var(--glow-yours), var(--shadow);
}

.board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  aspect-ratio: 1;
  max-width: 520px;
  border: 3px solid var(--board-edge);
  border-radius: 4px;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

[data-skin="terminal"] .board {
  border-width: 2px;
  box-shadow: 0 0 16px rgba(0, 255, 136, 0.12);
}

[data-skin="midnight"] .board {
  border-width: 2px;
  box-shadow: 0 0 20px rgba(139, 124, 255, 0.15);
}

[data-skin="bitcoin"] .board {
  border-width: 2px;
  box-shadow:
    0 0 16px rgba(247, 147, 26, 0.28),
    0 0 32px rgba(247, 147, 26, 0.12);
}

/* ₿ mark on every chip (men + kings) */
[data-skin="bitcoin"] .piece {
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-skin="bitcoin"] .piece::after {
  content: "₿";
  font-size: clamp(0.7rem, 3.2vw, 1.15rem);
  font-weight: 800;
  line-height: 1;
  font-family: system-ui, "Segoe UI", sans-serif;
  pointer-events: none;
  z-index: 2;
}

[data-skin="bitcoin"] .piece.dark::after {
  color: #f7931a;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.85);
}

[data-skin="bitcoin"] .piece.light::after {
  color: #c97812;
  text-shadow: 0 1px 1px rgba(255, 255, 255, 0.35);
}

/* Kings: replace crown with a brighter ₿ */
[data-skin="bitcoin"] .piece.king::before {
  content: none;
}

[data-skin="bitcoin"] .piece.king::after {
  content: "₿";
  font-size: clamp(0.85rem, 3.8vw, 1.35rem);
  filter: drop-shadow(0 0 3px rgba(247, 147, 26, 0.7));
}

[data-skin="bitcoin"] .piece.dark.king::after {
  color: #ffd280;
}

[data-skin="bitcoin"] .piece.light.king::after {
  color: #f7931a;
}

/* ---- Unlock modal ---- */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: min(100%, 400px);
  max-height: min(90vh, 640px);
  overflow-y: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--panel-border);
}

.modal-header h2 {
  margin: 0;
  font-size: 1.15rem;
}

.close-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
}

.close-btn:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--text) 8%, transparent);
}

.modal-body {
  padding: 1.15rem;
}

.unlock-desc {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.unlock-price {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
}

.unlock-pay-btn {
  width: 100%;
  margin-bottom: 0.75rem;
}

.unlock-invoice-wrap {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.unlock-invoice-label {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

.unlock-qr {
  display: flex;
  justify-content: center;
  padding: 0.75rem;
  background: #fff;
  border-radius: 8px;
  margin: 0 auto;
  width: fit-content;
}

.unlock-qr img,
.unlock-qr canvas {
  display: block;
  max-width: 180px;
  height: auto;
}

.unlock-bolt11 {
  margin: 0;
  padding: 0.65rem 0.75rem;
  background: color-mix(in srgb, var(--bg) 85%, #000);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  font-size: 0.65rem;
  line-height: 1.35;
  word-break: break-all;
  white-space: pre-wrap;
  color: var(--muted);
  font-family: var(--font-mono);
  max-height: 5.5em;
  overflow-y: auto;
}

.unlock-sync {
  margin: 0;
  min-height: 1.3em;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

.unlock-sync.ok {
  color: var(--success);
}

.unlock-sync.error {
  color: var(--danger);
}

.unlock-error {
  margin: 0.75rem 0 0;
  color: var(--danger);
  font-size: 0.85rem;
}

#unlock-mock-btn {
  width: 100%;
}

#unlock-copy-btn {
  width: 100%;
}

.square {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  /* Larger hit area feel on touch */
  -webkit-tap-highlight-color: transparent;
}

.square.light {
  background: var(--light-sq);
}

.square.dark {
  background: var(--dark-sq);
  cursor: pointer;
}

.square.selected {
  box-shadow: inset 0 0 0 3px var(--selected);
}

.square.legal::after {
  content: "";
  position: absolute;
  width: 28%;
  height: 28%;
  border-radius: 50%;
  background: var(--highlight);
  pointer-events: none;
}

.square.legal.has-piece::after {
  width: 78%;
  height: 78%;
  background: transparent;
  border: 3px solid var(--capture-ring);
  border-radius: 50%;
}

.square .coord {
  position: absolute;
  font-size: clamp(0.45rem, 1.8vw, 0.55rem);
  opacity: 0.5;
  pointer-events: none;
  font-weight: 600;
  font-family: var(--font-mono);
}

.square .coord.file {
  bottom: 2px;
  right: 3px;
}

.square .coord.rank {
  top: 2px;
  left: 3px;
}

/* Pieces */

.piece {
  width: 72%;
  height: 72%;
  border-radius: 50%;
  box-shadow:
    0 3px 6px rgba(0, 0, 0, 0.45),
    inset 0 2px 4px rgba(255, 255, 255, 0.15);
  z-index: 1;
  transition: transform 0.12s ease;
  pointer-events: none;
}

@media (hover: hover) {
  .square:hover .piece {
    transform: scale(1.05);
  }
}

.piece.dark {
  background: radial-gradient(circle at 35% 30%, var(--piece-dark-hi), var(--piece-dark) 55%);
  border: 2px solid var(--piece-dark-border);
}

.piece.light {
  background: radial-gradient(circle at 35% 30%, var(--piece-light-hi), var(--piece-light) 55%);
  border: 2px solid var(--piece-light-border);
}

.piece.king::before {
  content: "♔";
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-size: 1.35em;
  line-height: 1;
}

.piece.dark.king::before {
  color: var(--king-dark);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
}

.piece.light.king::before {
  color: var(--king-light);
  text-shadow: 0 1px 1px rgba(255, 255, 255, 0.35);
}

/* Sidebar turn colors */

#turn-indicator.yours {
  color: var(--success);
}

#turn-indicator.theirs {
  color: var(--muted);
}

/* ---- Mobile ---- */

@media (max-width: 700px) {
  .app {
    padding: 0.85rem 0.65rem 2rem;
  }

  .header {
    margin-bottom: 0.85rem;
  }

  .subtitle {
    font-size: 0.8rem;
  }

  .skin-picker {
    margin-bottom: 0.85rem;
    padding: 0.45rem 0.55rem;
  }

  .skin-option span:not(.skin-swatch) {
    /* keep labels — short enough */
  }

  .game {
    flex-direction: column;
    align-items: stretch;
    gap: 0.85rem;
  }

  /* Board + turn first on mobile */
  .board-column {
    order: 1;
    width: 100%;
    max-width: none;
  }

  .sidebar {
    order: 2;
    width: 100%;
    max-width: none;
  }

  .board-wrap {
    padding: 6px;
    max-width: none;
  }

  .board {
    /* Fill width; leave a little room for page padding */
    width: 100%;
    max-width: min(100vw - 1.5rem, 520px);
    margin: 0 auto;
  }

  .turn-banner {
    position: sticky;
    top: 0;
    z-index: 20;
    font-size: 0.9rem;
    padding: 0.65rem 0.75rem;
    /* backdrop so content scrolling under is readable */
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }

  .info-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    padding: 0.65rem 0.85rem;
  }

  .info-row {
    padding: 0.45rem 0.35rem;
  }

  .info-row + .info-row {
    border-top: none;
  }

  /* Keep visual separation in 2x2 grid */
  .info-row:nth-child(1),
  .info-row:nth-child(2) {
    border-bottom: 1px solid var(--panel-border);
  }

  .info-row:nth-child(odd) {
    border-right: 1px solid var(--panel-border);
  }

  .legend {
    display: none; /* hint is in turn banner / messages on small screens */
  }

  .message {
    min-height: 1.5em;
    text-align: center;
  }

  .lobby-actions {
    flex-direction: column;
  }

  .panel {
    padding: 1.25rem 1rem;
  }
}

@media (max-width: 380px) {
  .skin-option {
    padding: 0.35rem 0.5rem;
    font-size: 0.75rem;
  }

  .piece.king::before {
    font-size: 1.1em;
  }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  .turn-banner.yours {
    animation: none;
  }

  .piece,
  .btn,
  .turn-banner {
    transition: none;
  }
}