.board-settings {
  width: min(520px, 100%);
  max-height: min(90vh, 720px);
  overflow-y: auto;
  text-align: left;
  padding-right: 4px;
}

.board-settings__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  text-align: center;
}

.board-settings__hint {
  margin: 0 0 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.45;
}

.board-settings__section {
  margin: 0 0 20px;
  padding: 0;
  border: 0;
}

.board-settings__legend {
  margin: 0 0 10px;
  padding: 0;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.board-settings__options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.board-settings__options--accents,
.board-settings__options--compact {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.board-settings__option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}

.board-settings__option:hover {
  border-color: rgba(184, 255, 46, 0.35);
}

.board-settings__option--active {
  border-color: var(--green);
  background: rgba(184, 255, 46, 0.08);
  color: var(--green);
}

.board-settings__preview {
  width: 100%;
  height: 44px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  position: relative;
  overflow: hidden;
}

.board-settings__preview::after {
  content: "";
  position: absolute;
  inset: 10px 12px auto;
  height: 3px;
  border-radius: 999px;
  background: var(--preview-accent, var(--green));
}

.board-settings__preview--dark {
  background: linear-gradient(180deg, #1a2230 0%, #0f131a 100%);
}

.board-settings__preview--light {
  background: linear-gradient(180deg, #ffffff 0%, #eef1f6 100%);
}

.board-settings__preview--classic {
  background: linear-gradient(180deg, #d9d9d9 0%, #a8a8a8 100%);
}

.board-settings__preview--accent-green {
  --preview-accent: #b8ff2e;
}

.board-settings__preview--accent-blue {
  --preview-accent: #5c8dff;
}

.board-settings__preview--accent-orange {
  --preview-accent: #ff9f1a;
}

.board-settings__preview--accent-purple {
  --preview-accent: #c77dff;
}

.board-settings__preview--accent-pink {
  --preview-accent: #ff4d9d;
}

.board-settings__preview--numbers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  place-items: center;
  gap: 2px;
  padding: 8px 6px;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 800;
}

.board-settings__preview--numbers span:nth-child(1) {
  color: var(--preview-n1, #6bcbff);
}

.board-settings__preview--numbers span:nth-child(2) {
  color: var(--preview-n2, #7ed321);
}

.board-settings__preview--numbers span:nth-child(3) {
  color: var(--preview-n3, #ff4d9d);
}

.board-settings__preview--numbers span:nth-child(4) {
  color: var(--preview-n4, #9b59ff);
}

.board-settings__preview--numbers-classic {
  --preview-n1: #6bcbff;
  --preview-n2: #7ed321;
  --preview-n3: #ff4d9d;
  --preview-n4: #9b59ff;
}

.board-settings__preview--numbers-vivid {
  --preview-n1: #00b4ff;
  --preview-n2: #2ee600;
  --preview-n3: #ff2d7a;
  --preview-n4: #8b3dff;
}

.board-settings__preview--numbers-mono {
  --preview-n1: #8b97a8;
  --preview-n2: #6f7d92;
  --preview-n3: #556173;
  --preview-n4: #3d4756;
}

.board-settings__preview--numbers-pastel {
  --preview-n1: #8ecae6;
  --preview-n2: #95d5b2;
  --preview-n3: #f4a6c8;
  --preview-n4: #cdb4db;
}

.board-settings__preview-icon {
  display: grid;
  place-items: center;
  width: 100%;
  height: 44px;
  font-size: 1.5rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(0, 0, 0, 0.2);
}

.board-settings__preview--palette {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  padding: 10px 8px;
  height: 44px;
}

.board-settings__preview--palette span {
  border-radius: 4px;
}

.board-settings__preview--palette-neon span:nth-child(1) { background: #5ce1ff; }
.board-settings__preview--palette-neon span:nth-child(2) { background: #b8ff2e; }
.board-settings__preview--palette-neon span:nth-child(3) { background: #c77dff; }
.board-settings__preview--palette-neon span:nth-child(4) { background: #ff5c7a; }

.board-settings__preview--palette-classic span:nth-child(1) { background: #00e8e8; }
.board-settings__preview--palette-classic span:nth-child(2) { background: #00e800; }
.board-settings__preview--palette-classic span:nth-child(3) { background: #b020f0; }
.board-settings__preview--palette-classic span:nth-child(4) { background: #e80000; }

.board-settings__preview--palette-pastel span:nth-child(1) { background: #9be7ff; }
.board-settings__preview--palette-pastel span:nth-child(2) { background: #c8f57a; }
.board-settings__preview--palette-pastel span:nth-child(3) { background: #ddb3ff; }
.board-settings__preview--palette-pastel span:nth-child(4) { background: #ff9eb8; }

.board-settings__preview--palette-mono span:nth-child(1) { background: #d8dee8; }
.board-settings__preview--palette-mono span:nth-child(2) { background: #c2cad6; }
.board-settings__preview--palette-mono span:nth-child(3) { background: #9aa6b6; }
.board-settings__preview--palette-mono span:nth-child(4) { background: #727f92; }

.board-settings__preview--block {
  position: relative;
  width: 34px;
  height: 34px;
  margin: 5px auto;
  border-radius: 6px;
  background: #5c8dff;
}

.board-settings__preview--block-glossy::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 4px;
  right: 4px;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.35);
}

.board-settings__preview--block-outline {
  background: rgba(92, 141, 255, 0.25);
  border: 2px solid #5c8dff;
}

.board-settings__preview--ghost {
  position: relative;
  overflow: hidden;
}

.board-settings__preview--ghost::before,
.board-settings__preview--ghost::after {
  content: "";
  position: absolute;
  left: 18px;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: #b8ff2e;
}

.board-settings__preview--ghost::before {
  top: 22px;
  opacity: 0.35;
}

.board-settings__preview--ghost::after {
  top: 8px;
}

.board-settings__preview--ghost-strong::before {
  opacity: 0.55;
}

.board-settings__preview--ghost-faint::before {
  opacity: 0.18;
}

.board-settings__preview--ghost-off::before {
  display: none;
}

.board-settings__preview--swatch {
  width: 28px;
  height: 28px;
  margin: 8px auto;
  border-radius: 999px;
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.board-settings__preview--swatch-green { background: #b8ff2e; }
.board-settings__preview--swatch-blue { background: #5c8dff; }
.board-settings__preview--swatch-pink { background: #ff4d9d; }
.board-settings__preview--swatch-purple { background: #c77dff; }
.board-settings__preview--swatch-orange { background: #ff9f1a; }
.board-settings__preview--swatch-red { background: #ff5c7a; }
.board-settings__preview--swatch-yellow { background: #ffd24d; }

.board-settings__option--locked {
  opacity: 0.58;
  cursor: not-allowed;
}

.board-settings__option--locked:hover {
  border-color: var(--border);
  transform: none;
}

.board-settings__lock-hint {
  font-size: 0.66rem;
  font-weight: 500;
  color: var(--text-muted);
  line-height: 1.25;
  text-align: center;
}

.board-settings__option:not(.board-settings__option--locked) .board-settings__lock-hint {
  display: none;
}

.board-settings__preview--model {
  position: relative;
  height: 44px;
}

.board-settings__preview--model-snake::before,
.board-settings__preview--model-snake::after,
.board-settings__preview--model-dragon::before,
.board-settings__preview--model-dragon::after {
  content: "";
  position: absolute;
  border-radius: 4px;
}

.board-settings__preview--model-snake::before {
  left: 14px;
  top: 16px;
  width: 14px;
  height: 14px;
  background: #b8ff2e;
}

.board-settings__preview--model-snake::after {
  right: 14px;
  top: 14px;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: #ff4d4d;
}

.board-settings__preview--model-dragon::before {
  left: 10px;
  top: 18px;
  width: 38px;
  height: 10px;
  border-radius: 6px 10px 6px 4px;
  background: linear-gradient(90deg, #6a040f 0%, #c1121f 55%, #d62828 100%);
  box-shadow: inset 0 1px 0 rgba(255, 209, 102, 0.45);
}

.board-settings__preview--model-dragon::after {
  right: 10px;
  top: 11px;
  width: 22px;
  height: 14px;
  border-radius: 2px 10px 2px 8px;
  background: linear-gradient(180deg, #ffd166 0%, #d62828 58%, #9d0208 100%);
  clip-path: polygon(0% 50%, 72% 0%, 100% 38%, 78% 50%, 100% 62%, 72% 100%);
}

.board-settings__preview--model-train::before {
  left: 8px;
  top: 16px;
  width: 34px;
  height: 13px;
  border-radius: 4px 8px 4px 3px;
  background: linear-gradient(180deg, #58d68d 0%, #1e6b3a 72%);
  box-shadow:
    inset 0 -3px 0 #f1c40f,
    12px -4px 0 -2px #1f2d3d,
    26px 1px 0 -5px #f4d03f;
}

.board-settings__preview--model-train::after {
  right: 10px;
  top: 17px;
  width: 20px;
  height: 11px;
  border-radius: 6px 6px 2px 2px;
  background:
    linear-gradient(#aed6f1, #aed6f1) 3px 3px / 5px 4px no-repeat,
    linear-gradient(#aed6f1, #aed6f1) 11px 3px / 5px 4px no-repeat,
    linear-gradient(180deg, #5dade2 0%, #2e86c1 100%);
  box-shadow: inset 0 3px 0 #1a5276;
}

.board-settings__preview--model-jumper-space::before,
.board-settings__preview--model-jumper-space::after,
.board-settings__preview--model-jumper-abyss::before,
.board-settings__preview--model-jumper-abyss::after {
  content: "";
  position: absolute;
}

.board-settings__preview--model-jumper-space::before {
  left: 12px;
  top: 10px;
  width: 18px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(180deg, #b8c4d4 0%, #5a6d85 100%);
  box-shadow: inset 0 -4px 0 #3d4f6a;
}

.board-settings__preview--model-jumper-space::after {
  left: 16px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background: radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.5), #4dabf7 55%, #3d4f6a 100%);
  box-shadow: 0 0 6px rgba(77, 171, 247, 0.45);
}

.board-settings__preview--model-jumper-abyss::before {
  left: 12px;
  top: 10px;
  width: 18px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(180deg, #1a3a5c 0%, #0d2840 100%);
}

.board-settings__preview--model-jumper-abyss::after {
  left: 16px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background: radial-gradient(circle at 35% 35%, rgba(255, 255, 255, 0.35), #7bdcb5 55%, #1a3a5c 100%);
  box-shadow:
    -8px -4px 0 1px rgba(255, 212, 59, 0.55),
    10px -2px 0 1px rgba(72, 202, 228, 0.45);
}

.board-settings__preview--model-tetris-electronika::before,
.board-settings__preview--model-tetris-electronika::after {
  content: "";
  position: absolute;
  border-radius: 1px;
}

.board-settings__preview--model-tetris-electronika::before {
  left: 10px;
  top: 12px;
  width: 34px;
  height: 22px;
  background: #0a1208;
  box-shadow: inset 0 0 0 1px rgba(110, 240, 110, 0.35);
}

.board-settings__preview--model-tetris-electronika::after {
  left: 14px;
  top: 16px;
  width: 10px;
  height: 10px;
  background: #7ef07e;
  box-shadow:
    14px 0 0 #58d058,
    28px 0 0 #4cc04c,
    0 14px 0 #3fb03f,
    14px 14px 0 #34a034;
}

.board-settings__preview--model-tetris-famicom::before,
.board-settings__preview--model-tetris-famicom::after {
  content: "";
  position: absolute;
}

.board-settings__preview--model-tetris-famicom::before {
  left: 10px;
  top: 12px;
  width: 34px;
  height: 22px;
  border-radius: 4px;
  background: #1a1028;
  box-shadow: inset 0 0 0 1px rgba(188, 124, 252, 0.25);
}

.board-settings__preview--model-tetris-famicom::after {
  left: 14px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: linear-gradient(180deg, #7ee0fc 0%, #3cbcfc 100%);
  box-shadow:
    14px 0 0 #f8d878,
    28px 0 0 #bc7cfc,
    0 14px 0 #58d854,
    14px 14px 0 #e84058;
}

.board-settings__preview--model-tetris-orbita::before,
.board-settings__preview--model-tetris-orbita::after {
  content: "";
  position: absolute;
}

.board-settings__preview--model-tetris-orbita::before {
  left: 10px;
  top: 12px;
  width: 34px;
  height: 22px;
  border-radius: 3px;
  background:
    radial-gradient(1px 1px at 20% 30%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1px 1px at 70% 60%, rgba(255, 255, 255, 0.35), transparent),
    #060810;
  box-shadow: inset 0 0 0 1px rgba(92, 141, 255, 0.28);
}

.board-settings__preview--model-tetris-orbita::after {
  left: 14px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: #5ce1ff;
  box-shadow:
    inset 0 0 0 1px rgba(92, 141, 255, 0.35),
    inset 0 2px 0 rgba(255, 255, 255, 0.35),
    14px 0 0 #ffd43b,
    28px 0 0 #c77dff,
    0 14px 0 #20f2f2,
    14px 14px 0 #5c8dff;
}

.board-settings__preview--model-tetris-bezdna::before,
.board-settings__preview--model-tetris-bezdna::after {
  content: "";
  position: absolute;
}

.board-settings__preview--model-tetris-bezdna::before {
  left: 10px;
  top: 12px;
  width: 34px;
  height: 22px;
  border-radius: 4px;
  background:
    radial-gradient(2px 2px at 24% 68%, rgba(123, 220, 181, 0.45), transparent),
    radial-gradient(1.5px 1.5px at 72% 38%, rgba(72, 202, 228, 0.35), transparent),
    #041020;
  box-shadow: inset 0 0 0 1px rgba(32, 242, 242, 0.22);
}

.board-settings__preview--model-tetris-bezdna::after {
  left: 14px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 4px;
  background: #48cae4;
  box-shadow:
    0 0 6px rgba(32, 242, 242, 0.45),
    14px 0 0 #7bdcb5,
    28px 0 0 #c77dff,
    0 14px 0 #20f2f2,
    14px 14px 0 #52b788;
}

.board-settings__preview--model-tetris-arcade::before,
.board-settings__preview--model-tetris-arcade::after {
  content: "";
  position: absolute;
}

.board-settings__preview--model-tetris-arcade::before {
  left: 10px;
  top: 12px;
  width: 34px;
  height: 22px;
  border-radius: 2px;
  background:
    radial-gradient(ellipse at 50% 20%, rgba(126, 240, 126, 0.22) 0%, transparent 58%),
    linear-gradient(180deg, #2a2010 0%, #181008 100%);
  box-shadow: inset 0 0 0 1px rgba(126, 240, 126, 0.34);
}

.board-settings__preview--model-tetris-arcade::after {
  left: 14px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 1px;
  background: #00ffff;
  box-shadow:
    inset 0 0 0 1px #fff,
    14px 0 0 #ffff00,
    28px 0 0 #ff00ff,
    0 14px 0 #00ff00,
    14px 14px 0 #ff0000;
}

.board-settings__preview--model-tetris-crystal::before,
.board-settings__preview--model-tetris-crystal::after {
  content: "";
  position: absolute;
}

.board-settings__preview--model-tetris-crystal::before {
  left: 10px;
  top: 12px;
  width: 34px;
  height: 22px;
  border-radius: 4px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(199, 125, 255, 0.28) 0%, transparent 52%),
    radial-gradient(1px 1px at 24% 28%, rgba(255, 255, 255, 0.45), transparent),
    radial-gradient(1px 1px at 72% 64%, rgba(92, 225, 255, 0.4), transparent),
    linear-gradient(155deg, #16082e 0%, #08061a 100%);
  box-shadow: inset 0 0 0 1px rgba(199, 125, 255, 0.3);
}

.board-settings__preview--model-tetris-crystal::after {
  left: 14px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 4px;
  background: linear-gradient(145deg, #7ec8ff 0%, #4dabf7 55%, #2f6db8 100%);
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, 0.42),
    14px 0 0 #ffd43b,
    28px 0 0 #c77dff,
    0 14px 0 #52b788,
    14px 14px 0 #ff6b6b;
}

.board-settings__preview--model-g2048-orbita::before,
.board-settings__preview--model-g2048-orbita::after,
.board-settings__preview--model-g2048-bezdna::before,
.board-settings__preview--model-g2048-bezdna::after {
  content: "";
  position: absolute;
}

.board-settings__preview--model-g2048-orbita::before {
  left: 10px;
  top: 12px;
  width: 34px;
  height: 22px;
  border-radius: 4px;
  background:
    radial-gradient(1px 1px at 22% 30%, rgba(255, 255, 255, 0.55), transparent),
    radial-gradient(1px 1px at 70% 62%, rgba(255, 255, 255, 0.35), transparent),
    linear-gradient(160deg, #1a2233, #0c121a);
}

.board-settings__preview--model-g2048-orbita::after {
  left: 14px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: linear-gradient(145deg, #5ce1ff, #5c8dff);
  box-shadow:
    14px 0 0 #b8c4d4,
    28px 0 0 #f1c40f,
    0 14px 0 #20f2f2,
    14px 14px 0 #7ec8ff;
}

.board-settings__preview--model-g2048-bezdna::before {
  left: 10px;
  top: 12px;
  width: 34px;
  height: 22px;
  border-radius: 4px;
  background:
    radial-gradient(2px 2px at 28% 70%, rgba(123, 220, 181, 0.45), transparent),
    radial-gradient(1.5px 1.5px at 72% 36%, rgba(72, 202, 228, 0.4), transparent),
    linear-gradient(160deg, #0d2840, #071820);
}

.board-settings__preview--model-g2048-bezdna::after {
  left: 14px;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: linear-gradient(145deg, #7bdcb5, #2d6a4f);
  box-shadow:
    0 0 6px rgba(123, 220, 181, 0.45),
    14px 0 0 #48cae4,
    28px 0 0 #ffd43b,
    0 14px 0 #c77dff,
    14px 14px 0 #52b788;
}

.board-settings__actions {
  display: flex;
  justify-content: center;
  margin-top: 8px;
  position: sticky;
  bottom: 0;
  padding-top: 8px;
  background: linear-gradient(180deg, transparent, var(--bg-card) 30%);
}

.tool-btn--settings {
  margin-top: 4px;
}

@media (max-width: 520px) {
  .board-settings__options--accents,
  .board-settings__options--compact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}