/* === CSS Variables (matching GNOME Sudoku's style.css) === */
:root {
    --sudoku-accent-blue: oklch(0.92 0.25 270);
    --sudoku-accent-teal: oklch(0.92 0.25 205);
    --sudoku-accent-green: oklch(0.92 0.25 145);
    --sudoku-accent-yellow: oklch(0.92 0.25 100);
    --sudoku-accent-orange: oklch(0.92 0.25 60);
    --sudoku-accent-red: oklch(0.92 0.25 20);
    --sudoku-accent-pink: oklch(0.92 0.25 5);
    --sudoku-accent-purple: oklch(0.92 0.25 300);
    --sudoku-accent-slate: oklch(0.92 0.05 250);
    --sudoku-accent-color: var(--sudoku-accent-blue);
    --sudoku-pause-delay: 2s;
    --view-bg-color: #ffffff;
    --headerbar-bg: #f5f5f5;
    --text-color: #1a1a1a;
    --border-color: #333;
    --error-color: #c01c28;
    --success-color: #26a269;
    --warning-color: #e5a50a;
    --fixed-bg: #ccc;
    --cell-bg: #ffffff;
    --block-border: #999;
    --grid-bg: #333;
    --dialog-bg: #ffffff;
    --overlay-bg: rgba(0,0,0,0.5);
    --hover-bg: rgba(0,0,0,0.05);
    --active-bg: rgba(0,0,0,0.1);
}

:root[data-theme="dark"] {
    --sudoku-dark-grey: oklch(0.39 0 0);
    --sudoku-accent-blue: oklch(0.35 0.1 230);
    --sudoku-accent-teal: oklch(0.35 0.1 205);
    --sudoku-accent-green: oklch(0.35 0.1 145);
    --sudoku-accent-yellow: oklch(0.35 0.1 100);
    --sudoku-accent-orange: oklch(0.35 0.1 60);
    --sudoku-accent-red: oklch(0.35 0.1 30);
    --sudoku-accent-pink: oklch(0.35 0.1 345);
    --sudoku-accent-purple: oklch(0.35 0.1 310);
    --sudoku-accent-slate: oklch(0.35 0.03 250);
    --view-bg-color: #242424;
    --headerbar-bg: #303030;
    --text-color: #ffffff;
    --border-color: #555;
    --fixed-bg: oklch(0.32 0 0);
    --cell-bg: var(--sudoku-dark-grey);
    --block-border: oklch(0.47 0 0);
    --grid-bg: oklch(0.56 0 0);
    --dialog-bg: #383838;
    --hover-bg: rgba(255,255,255,0.05);
    --active-bg: rgba(255,255,255,0.1);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        --sudoku-dark-grey: oklch(0.39 0 0);
        --sudoku-accent-blue: oklch(0.35 0.1 230);
        --sudoku-accent-teal: oklch(0.35 0.1 205);
        --sudoku-accent-green: oklch(0.35 0.1 145);
        --sudoku-accent-yellow: oklch(0.35 0.1 100);
        --sudoku-accent-orange: oklch(0.35 0.1 60);
        --sudoku-accent-red: oklch(0.35 0.1 30);
        --sudoku-accent-pink: oklch(0.35 0.1 345);
        --sudoku-accent-purple: oklch(0.35 0.1 310);
        --sudoku-accent-slate: oklch(0.35 0.03 250);
        --view-bg-color: #242424;
        --headerbar-bg: #303030;
        --text-color: #ffffff;
        --border-color: #555;
        --fixed-bg: oklch(0.32 0 0);
        --cell-bg: var(--sudoku-dark-grey);
        --block-border: oklch(0.47 0 0);
        --grid-bg: oklch(0.56 0 0);
        --dialog-bg: #383838;
        --hover-bg: rgba(255,255,255,0.05);
        --active-bg: rgba(255,255,255,0.1);
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--view-bg-color);
    color: var(--text-color);
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* === View Management === */
.view {
    display: none;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}
.view.active {
    display: flex;
}

/* === Headerbar === */
.headerbar {
    display: flex;
    align-items: center;
    background: var(--headerbar-bg);
    padding: 0 6px;
    min-height: 48px;
    gap: 6px;
    flex-shrink: 0;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.bottom-headerbar {
    border-bottom: none;
    border-top: 1px solid rgba(0,0,0,0.1);
}

.headerbar-left, .headerbar-right {
    display: flex;
    align-items: center;
    gap: 2px;
}

.window-title {
    flex: 1;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 0;
}

.window-title .title {
    font-weight: 600;
    font-size: 14px;
}

.window-title .subtitle {
    font-size: 11px;
    opacity: 0.7;
}

/* === Icon Buttons === */
.icon-button {
    width: 36px;
    height: 36px;
    border: none;
    background: none;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    transition: background 0.15s;
    flex-shrink: 0;
}

.icon-button:hover {
    background: var(--hover-bg);
}

.icon-button:active {
    background: var(--active-bg);
}

.icon-button svg {
    width: 16px;
    height: 16px;
}

.toggle-button.active {
    background: var(--active-bg);
    color: #3584e4;
}

/* === Start View === */
.start-content {
    flex: 1;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 40px 20px;
    overflow-y: auto;
}

.status-page {
    max-width: 400px;
    width: 100%;
    text-align: center;
}

.status-page h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
}

.difficulty-group {
    background: var(--headerbar-bg);
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 12px;
}

.difficulty-row {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.15s;
    gap: 12px;
}

.difficulty-row:hover {
    background: var(--hover-bg);
}

.difficulty-row input[type="radio"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #888;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.difficulty-row input:checked + .checkmark {
    border-color: #3584e4;
    background: #3584e4;
}

.difficulty-row input:checked + .checkmark::after {
    content: '';
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
}

.difficulty-label {
    font-size: 15px;
}

/* === Buttons === */
.pill-button {
    display: inline-block;
    padding: 10px 24px;
    border: none;
    border-radius: 24px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    background: var(--headerbar-bg);
    color: var(--text-color);
    transition: all 0.15s;
    margin-top: 12px;
}

.pill-button:hover {
    background: var(--hover-bg);
}

.pill-button.suggested {
    background: #3584e4;
    color: white;
}

.pill-button.suggested:hover {
    background: #2a6fc9;
}

.round-button {
    padding: 10px 20px;
    border: 1px solid rgba(0,0,0,0.15);
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    background: var(--headerbar-bg);
    color: var(--text-color);
    transition: all 0.15s;
}

.round-button:hover {
    background: var(--hover-bg);
}

.round-button.suggested {
    background: #3584e4;
    color: white;
    border-color: #3584e4;
}

#open-shared-box {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

#open-shared-box .round-button {
    flex: 1;
}

/* === Grid Container === */
.grid-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 20px;
    position: relative;
    overflow: hidden;
    gap: 12px;
}

/* === Sudoku Grid === */
.sudoku-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 2px;
    background: var(--grid-bg);
    border: 2px solid var(--border-color);
    aspect-ratio: 1;
    max-width: 500px;
    max-height: 500px;
    width: 100%;
    --cell-value-size: 28px;
    --cell-earmark-size: 11px;
}

.sudoku-block {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 1px;
    background: var(--block-border);
}

.sudoku-cell {
    background: var(--cell-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: pointer;
    font-size: var(--cell-value-size, 28px);
    font-weight: 500;
    transition: background 0.15s;
    aspect-ratio: 1;
    min-width: 0;
    min-height: 0;
}

.sudoku-cell:hover {
    background: var(--hover-bg);
}

.sudoku-cell.fixed {
    background: var(--fixed-bg);
    font-weight: 600;
}

.sudoku-cell.selected {
    background: var(--sudoku-accent-color) !important;
}

.sudoku-cell.highlight-coord {
    background: oklch(from var(--sudoku-accent-color) 0.9 calc(c * 0.25) h);
}

.sudoku-cell.highlight-number {
    background: oklch(from var(--sudoku-accent-color) 0.85 c h);
}

/* Dark mode overrides for highlights */
:root[data-theme="dark"] .sudoku-cell.highlight-coord {
    background: oklch(from var(--sudoku-accent-color) l calc(c * 0.25) h);
}

:root[data-theme="dark"] .sudoku-cell.highlight-number {
    background: oklch(from var(--sudoku-accent-color) 0.32 calc(c * 0.7) h);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) .sudoku-cell.highlight-coord {
        background: oklch(from var(--sudoku-accent-color) l calc(c * 0.25) h);
    }
    :root:not([data-theme]) .sudoku-cell.highlight-number {
        background: oklch(from var(--sudoku-accent-color) 0.32 calc(c * 0.7) h);
    }
}

.sudoku-cell.error .cell-value {
    color: var(--error-color);
    font-weight: bold;
}

.sudoku-cell.paused .cell-value,
.sudoku-cell.paused .earmarks-container {
    opacity: 0;
    transition: opacity var(--sudoku-pause-delay);
}

/* === Cell Value === */
.cell-value {
    font-variant-numeric: tabular-nums;
    z-index: 1;
}

/* === Earmarks (Notizen) === */
.earmarks-container {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    padding: 1px;
    z-index: 0;
}

.earmark {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--cell-earmark-size, 11px);
    color: #666;
    font-variant-numeric: tabular-nums;
}

.symbol-swatch {
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.15);
}

.symbol-text {
    line-height: 1;
}

.earmark.highlight-number {
    color: oklab(from var(--sudoku-accent-color) 0.5 a b);
    font-weight: bold;
}

.earmark.error {
    color: var(--error-color);
    text-decoration: line-through;
}

/* === Game Legend === */
.game-legend {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 8px 14px;
    background: var(--headerbar-bg);
    border-radius: 10px;
    font-size: 12px;
    flex-shrink: 0;
}

.game-legend .legend-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.game-legend .legend-swatch {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

/* === Pause Overlay === */
.pause-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    pointer-events: none;
}

.pause-overlay span {
    font-weight: bold;
    color: #fff;
    background: rgba(0,0,0,0.75);
    padding: 8px 24px;
    border-radius: 8px;
    font-size: 18px;
    animation: slow-appear var(--sudoku-pause-delay) forwards;
}

@keyframes slow-appear {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* === Number Picker === */
.number-picker {
    position: fixed;
    z-index: 100;
    background: var(--dialog-bg);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    padding: 8px;
    min-width: 180px;
}

.picker-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.picker-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 3px;
}

.picker-btn {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--hover-bg);
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    font-weight: 500;
    color: var(--text-color);
    transition: background 0.15s;
    font-variant-numeric: tabular-nums;
    display: flex;
    align-items: center;
    justify-content: center;
}

.picker-btn:hover {
    background: var(--active-bg);
}

.picker-clear {
    width: 100%;
    padding: 8px;
    border: none;
    background: var(--hover-bg);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-color);
    margin-top: 4px;
}

.picker-clear:hover {
    background: var(--active-bg);
}

.picker-actions {
    display: flex;
    gap: 6px;
    width: 100%;
    margin-top: 4px;
}

.picker-actions .picker-clear {
    flex: 1;
    margin-top: 0;
}

.picker-lock {
    width: 44px;
    height: 36px;
    border: none;
    background: var(--hover-bg);
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-color);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.picker-lock svg {
    width: 18px;
    height: 18px;
}

.picker-lock:hover {
    background: var(--active-bg);
}

.picker-lock.active {
    background: var(--active-bg);
    color: #3584e4;
}

/* === Menu Popover === */
.menu-popover {
    position: fixed;
    z-index: 100;
    background: var(--dialog-bg);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    padding: 4px;
    min-width: 200px;
}

.menu-item {
    display: block;
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: none;
    text-align: left;
    font-size: 14px;
    color: var(--text-color);
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.15s;
}

.menu-item:hover {
    background: var(--hover-bg);
}

/* === Clock === */
.clock-box {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 8px;
}

.clock-icon {
    width: 16px;
    height: 16px;
    color: var(--text-color);
    opacity: 0.7;
}

.clock-label {
    font-size: 14px;
    font-variant-numeric: tabular-nums;
    font-weight: 500;
}

.clock-label.success {
    color: var(--success-color);
}

.clock-label.warning {
    color: var(--warning-color);
}

/* === Dialog === */
.dialog-overlay {
    position: fixed;
    inset: 0;
    background: var(--overlay-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.dialog {
    background: var(--dialog-bg);
    border-radius: 16px;
    padding: 24px;
    max-width: 400px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 16px 48px rgba(0,0,0,0.3);
}

.dialog h3 {
    font-size: 18px;
    margin-bottom: 16px;
}

.dialog h4 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.7;
    margin-bottom: 8px;
}

.pref-group {
    margin-bottom: 16px;
}

.pref-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 0;
    cursor: pointer;
    font-size: 14px;
}

.pref-row input[type="checkbox"] {
    width: 40px;
    height: 24px;
    appearance: none;
    -webkit-appearance: none;
    background: #888;
    border-radius: 12px;
    position: relative;
    cursor: pointer;
    transition: background 0.2s;
    flex-shrink: 0;
}

.pref-row input[type="checkbox"]::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s;
}

.pref-row input[type="checkbox"]:checked {
    background: #3584e4;
}

.pref-row input[type="checkbox"]:checked::after {
    transform: translateX(16px);
}

.pref-row select {
    padding: 4px 8px;
    border-radius: 6px;
    border: 1px solid rgba(128,128,128,0.4);
    background: var(--cell-bg);
    color: var(--text-color);
    font-size: 13px;
    cursor: pointer;
}

.pref-row.pref-slider {
    flex-wrap: wrap;
    gap: 8px;
}

.pref-row.pref-slider span:first-child {
    min-width: 100px;
}

.pref-row input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: #888;
    border-radius: 3px;
    cursor: pointer;
}

.pref-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: #3584e4;
    border-radius: 50%;
    cursor: pointer;
}

.pref-val {
    font-size: 12px;
    opacity: 0.7;
    min-width: 40px;
    text-align: right;
}

.pref-actions {
    justify-content: space-between;
    gap: 8px;
}

.pref-button {
    padding: 6px 10px;
    border: 1px solid rgba(128,128,128,0.4);
    border-radius: 6px;
    background: var(--cell-bg);
    color: var(--text-color);
    font-size: 13px;
    cursor: pointer;
}

.pref-upload {
    padding: 6px 10px;
    border: 1px dashed rgba(128,128,128,0.4);
    border-radius: 6px;
    background: var(--cell-bg);
    color: var(--text-color);
    font-size: 13px;
    cursor: pointer;
}

.pref-upload input {
    display: none;
}

.completion-dialog {
    text-align: center;
}

.completion-dialog h2 {
    font-size: 24px;
    margin-bottom: 12px;
}

.completion-dialog p {
    margin-bottom: 8px;
    font-size: 16px;
}

/* === Keyboard Shortcuts Dialog === */
.shortcuts-dialog {
    max-width: 440px;
}

.shortcuts-table {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-bottom: 16px;
}

.shortcut-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 13px;
    gap: 12px;
}

.shortcut-row:nth-child(even) {
    background: var(--hover-bg);
}

.shortcut-row kbd {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: var(--cell-bg);
    border: 1px solid rgba(128,128,128,0.4);
    border-radius: 4px;
    padding: 2px 6px;
    font-family: inherit;
    font-size: 12px;
    white-space: nowrap;
    flex-shrink: 0;
}

.shortcut-row span {
    text-align: right;
    opacity: 0.8;
    flex-shrink: 0;
}

/* === Puzzle Options Dialog === */
.puzzle-options-dialog {
    max-width: 380px;
}

.puzzle-options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 16px;
}

.puzzle-opt-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 12px;
    border: 1px solid rgba(128,128,128,0.3);
    border-radius: 12px;
    background: var(--cell-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
    font-size: 13px;
    font-family: inherit;
}

.puzzle-opt-btn:hover {
    background: var(--hover-bg);
    border-color: rgba(128,128,128,0.5);
}

.puzzle-opt-btn:active {
    background: var(--active-bg);
}

.puzzle-opt-btn svg {
    width: 28px;
    height: 28px;
    opacity: 0.8;
}

.puzzle-opt-btn span {
    font-weight: 500;
}

/* === Responsive === */
@media (max-width: 600px), (max-aspect-ratio: 3/4) {
    .bottom-headerbar {
        display: flex !important;
    }
    .top-headerbar .headerbar-left > .icon-button:not(.menu-button),
    .top-headerbar .headerbar-right > .icon-button:not(.menu-button) {
        display: none;
    }
    .top-headerbar .clock-box {
        display: flex !important;
    }
}

@media (min-width: 601px) and (min-aspect-ratio: 3/4) {
    .bottom-headerbar {
        display: none !important;
    }
}