:root {
  --cell-size: clamp(32px, 8.5vw, 52px);
}


.board-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  --board-bg: #141a24;
  --board-cell-bg: var(--bg-elevated);
  --board-cell-given-bg: rgba(255, 255, 255, 0.03);
  --board-text: var(--text);
  --board-text-muted: var(--text-muted);
  --board-border: rgba(255, 255, 255, 0.06);
  --board-border-strong: rgba(255, 255, 255, 0.22);
  --board-select-bg: rgba(184, 255, 46, 0.15);
  --board-select-outline: #b8ff2e;
  --board-peer-bg: rgba(184, 255, 46, 0.06);
  --board-same-bg: rgba(255, 159, 26, 0.12);
  --board-text-user: #b8ff2e;
  --board-error-bg: rgba(255, 77, 157, 0.12);
  --board-error-text: var(--pink);
  --board-cage-border: rgba(184, 255, 46, 0.55);
  --board-cage-sum: var(--orange);
}

.sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, var(--cell-size));
  grid-template-rows: repeat(9, var(--cell-size));
  background: var(--board-bg, var(--bg-card));
  border: 3px solid var(--board-border-strong, rgba(255, 255, 255, 0.2));
  border-radius: 8px;
  box-shadow: var(--shadow);
  user-select: none;
}

.cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--board-border, rgba(255, 255, 255, 0.06));
  font-size: clamp(1rem, 3vw, 1.4rem);
  font-weight: 700;
  cursor: pointer;
  background: var(--board-cell-bg, var(--bg-elevated));
  color: var(--board-text, var(--text));
  transition: background 0.1s;
  outline: none;
}

.cell--given {
  color: var(--board-text, var(--text));
  cursor: default;
  background: var(--board-cell-given-bg, rgba(255, 255, 255, 0.03));
}

.cell--user {
  color: var(--board-text-user, var(--green));
}

.cell--error {
  color: var(--board-error-text, var(--pink));
  background: var(--board-error-bg, rgba(255, 77, 157, 0.12));
}

.cell--selected {
  background: var(--board-select-bg, rgba(184, 255, 46, 0.15));
  outline: 2px solid var(--board-select-outline, var(--green));
  outline-offset: -2px;
  z-index: 1;
}

.cell--peer {
  background: var(--board-peer-bg, rgba(184, 255, 46, 0.06));
}

.cell--same {
  background: var(--board-same-bg, rgba(255, 159, 26, 0.12));
}

.cell--box-right {
  border-right: 2px solid var(--board-border-strong, rgba(255, 255, 255, 0.22));
}

.cell--box-bottom {
  border-bottom: 2px solid var(--board-border-strong, rgba(255, 255, 255, 0.22));
}

.cell__notes {
  position: absolute;
  inset: 2px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  font-size: 0.45rem;
  font-weight: 600;
  color: var(--board-text-muted, var(--text-muted));
  pointer-events: none;
}

.cell__notes span {
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.board-wrap[data-board-bg="light"] {
  --board-bg: #eef1f6;
  --board-cell-bg: #ffffff;
  --board-cell-given-bg: #e2e8f0;
  --board-text: #1a2434;
  --board-text-muted: #5c6778;
  --board-border: rgba(15, 23, 42, 0.1);
  --board-border-strong: rgba(15, 23, 42, 0.32);
  --board-select-bg: rgba(46, 160, 67, 0.18);
  --board-select-outline: #2ea043;
  --board-peer-bg: rgba(46, 160, 67, 0.08);
  --board-same-bg: rgba(230, 126, 34, 0.16);
  --board-text-user: #1b7a3d;
  --board-error-bg: rgba(220, 53, 90, 0.14);
  --board-error-text: #b4234a;
  --board-cage-border: rgba(27, 122, 61, 0.55);
  --board-cage-sum: #c45f00;
}

.board-wrap[data-board-bg="light"] .sudoku-board {
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.12);
}

.board-wrap[data-board-accent="blue"] {
  --board-select-bg: rgba(92, 141, 255, 0.18);
  --board-select-outline: #5c8dff;
  --board-peer-bg: rgba(92, 141, 255, 0.08);
  --board-same-bg: rgba(92, 141, 255, 0.14);
  --board-text-user: #5c8dff;
  --board-cage-border: rgba(92, 141, 255, 0.55);
}

.board-wrap[data-board-bg="light"][data-board-accent="blue"] {
  --board-select-bg: rgba(43, 111, 214, 0.2);
  --board-select-outline: #2b6fd6;
  --board-peer-bg: rgba(43, 111, 214, 0.1);
  --board-same-bg: rgba(43, 111, 214, 0.15);
  --board-text-user: #1a5fb4;
  --board-cage-border: rgba(43, 111, 214, 0.5);
}

.board-wrap[data-board-accent="orange"] {
  --board-select-bg: rgba(255, 159, 26, 0.2);
  --board-select-outline: #ff9f1a;
  --board-peer-bg: rgba(255, 159, 26, 0.09);
  --board-same-bg: rgba(255, 159, 26, 0.16);
  --board-text-user: #ff9f1a;
  --board-cage-border: rgba(255, 159, 26, 0.55);
}

.board-wrap[data-board-bg="light"][data-board-accent="orange"] {
  --board-select-bg: rgba(230, 126, 34, 0.2);
  --board-select-outline: #d97706;
  --board-peer-bg: rgba(230, 126, 34, 0.1);
  --board-same-bg: rgba(230, 126, 34, 0.16);
  --board-text-user: #b45309;
  --board-cage-border: rgba(217, 119, 6, 0.5);
}

.board-wrap[data-board-accent="purple"] {
  --board-select-bg: rgba(199, 125, 255, 0.2);
  --board-select-outline: #c77dff;
  --board-peer-bg: rgba(199, 125, 255, 0.09);
  --board-same-bg: rgba(199, 125, 255, 0.15);
  --board-text-user: #c77dff;
  --board-cage-border: rgba(199, 125, 255, 0.55);
}

.board-wrap[data-board-bg="light"][data-board-accent="purple"] {
  --board-select-bg: rgba(122, 43, 207, 0.18);
  --board-select-outline: #7a2bcf;
  --board-peer-bg: rgba(122, 43, 207, 0.1);
  --board-same-bg: rgba(122, 43, 207, 0.14);
  --board-text-user: #6b21a8;
  --board-cage-border: rgba(122, 43, 207, 0.45);
}

.board-wrap[data-board-accent="pink"] {
  --board-select-bg: rgba(255, 77, 157, 0.2);
  --board-select-outline: #ff4d9d;
  --board-peer-bg: rgba(255, 77, 157, 0.09);
  --board-same-bg: rgba(255, 77, 157, 0.15);
  --board-text-user: #ff4d9d;
  --board-cage-border: rgba(255, 77, 157, 0.55);
}

.board-wrap[data-board-bg="light"][data-board-accent="pink"] {
  --board-select-bg: rgba(199, 52, 125, 0.18);
  --board-select-outline: #c7347d;
  --board-peer-bg: rgba(199, 52, 125, 0.1);
  --board-same-bg: rgba(199, 52, 125, 0.14);
  --board-text-user: #9d174d;
  --board-cage-border: rgba(199, 52, 125, 0.45);
}

.board-settings {
  width: min(480px, 100%);
  text-align: left;
}

.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 {
  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--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__actions {
  display: flex;
  justify-content: center;
  margin-top: 8px;
}

.numpad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.numpad__key {
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.numpad__key:hover {
  border-color: var(--green);
  background: rgba(184, 255, 46, 0.08);
}

.numpad__key--dim {
  opacity: 0.35;
}

.tools {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.tool-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}

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

.tool-btn[aria-pressed="true"] {
  border-color: var(--orange);
  background: rgba(255, 159, 26, 0.1);
  color: var(--orange);
}

.tool-btn__icon {
  font-size: 1.1rem;
}

.tool-btn__label {
  flex: 1;
}

.tool-btn__count {
  display: grid;
  place-items: center;
  min-width: 1.65rem;
  height: 1.65rem;
  padding: 0 6px;
  margin-left: auto;
  border-radius: 999px;
  background: rgba(184, 255, 46, 0.14);
  color: var(--green);
  font-size: 0.82rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.tool-btn:disabled .tool-btn__count {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
}

.scores__total {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--green);
}

.scores__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.scores__list li {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

.scores__list li:last-child {
  border-bottom: none;
}

.modal[hidden] {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 20px;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
}

.modal__dialog {
  position: relative;
  width: min(400px, 100%);
  padding: 28px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  text-align: center;
}

.modal__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
}

.modal__title--loss {
  color: var(--pink);
}

.header__stat--mistakes {
  font-size: 0.88rem;
}

.header__stat--warn {
  border-color: rgba(255, 159, 26, 0.35);
  color: var(--orange);
}

.header__stat--danger {
  border-color: rgba(255, 77, 157, 0.35);
  color: var(--pink);
}

.modal__text {
  margin: 0 0 20px;
  color: var(--text-muted);
}

.modal__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.modal--generating {
  z-index: 110;
}

.modal__dialog--generating {
  padding: 20px 28px;
}

.modal__text--generating {
  margin: 0;
  font-weight: 600;
  color: var(--text);
}

@media (max-width: 900px) {
  :root {
    --cell-size: min(38px, calc((100vw - 32px) / 9));
  }

  .layout {
    grid-template-columns: 1fr;
    padding-bottom: calc(124px + env(safe-area-inset-bottom, 0px));
  }

  .panel--left {
    order: 1;
  }

  .board-wrap {
    order: 0;
  }

  .panel--right {
    order: 2;
  }

  .panel__gallery {
    display: none;
  }

  .header__stats {
    margin-left: 0;
    width: 100%;
  }

  .panel--right .numpad {
    position: fixed;
    left: 0;
    right: 0;
    bottom: calc(50px + env(safe-area-inset-bottom, 0px));
    z-index: 45;
    margin: 0;
    padding: 8px 10px;
    grid-template-columns: repeat(9, 1fr);
    gap: 4px;
    background: rgba(7, 9, 13, 0.96);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border);
  }

  .panel--right .numpad__key {
    aspect-ratio: auto;
    min-height: 40px;
    font-size: 0.95rem;
    touch-action: manipulation;
  }

  .panel--right .tools {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 45;
    margin: 0;
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom, 0px));
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 6px;
    background: rgba(7, 9, 13, 0.96);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border);
  }

  .panel--right .tool-btn {
    flex: 1;
    min-width: 0;
    padding: 8px 4px;
    font-size: 0.7rem;
    justify-content: center;
    flex-direction: column;
    gap: 2px;
    touch-action: manipulation;
  }

  .panel--right .tool-btn__icon {
    font-size: 1rem;
  }

  .panel--right .tool-btn__count {
    margin-left: 0;
    min-width: 1.45rem;
    height: 1.45rem;
    font-size: 0.72rem;
  }
}

@media (max-width: 420px) {
  :root {
    --cell-size: min(34px, calc((100vw - 24px) / 9));
  }
}

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