/* Main Wrapper styling - Solid premium light card by default */
.sudoku-container-wrap,
.sudoku-container-wrap * {
    box-sizing: border-box;
}

.sudoku-container-wrap {
    font-family: var(--global-body-font-family, inherit);
    max-width: 1000px;
    margin: 20px auto;
    padding: 30px;
    background: var(--bg-dark);
    color: var(--text-main);
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.sudoku-container-wrap h1,
.sudoku-container-wrap h2,
.sudoku-container-wrap h3,
.sudoku-container-wrap h4,
.sudoku-container-wrap h5,
.sudoku-container-wrap h6 {
    font-family: var(--global-heading-font-family, inherit);
}

/* Light Theme variables by default */
.sudoku-container-wrap {
    --primary-color: var(--global-palette1, #8b5cf6);
    --primary-color-hover: var(--global-palette2, #7c3aed);
    --bg-dark: var(--global-palette8, #ffffff);
    --bg-card: var(--global-palette7, #f8fafc);
    --bg-cell: var(--global-palette9, #ffffff);
    --bg-cell-given: var(--global-palette6, #f1f5f9);
    --border-color: var(--global-palette5, #cbd5e1);
    --border-thick: var(--global-palette4, #94a3b8);
    --text-main: var(--global-palette3, #1e293b);
    --text-muted: var(--global-palette4, #64748b);
    --text-given: var(--global-palette3, #1e293b);
    --text-user: var(--global-palette1, #2563eb);
    --text-error: var(--global-palette-highlight, #ef4444);
    --highlight-selected: rgba(139, 92, 246, 0.18);
    --highlight-related: rgba(139, 92, 246, 0.06);
    --highlight-match: rgba(139, 92, 246, 0.12);
    --transition-speed: 0.2s;

    /* Theme override fallbacks to ensure custom/dynamic colors apply to buttons/accents */
    --global-palette-btn-bg: var(--primary-color);
    --global-palette-btn-bg-hover: var(--primary-color-hover);
    --global-palette-btn: #ffffff;
    --global-palette-btn-hover: #ffffff;
    --global-palette-btn-sec-bg: var(--bg-card);
    --global-palette-btn-sec-bg-hover: rgba(30, 41, 59, 0.08);
    --global-palette-btn-sec: var(--text-main);
    --global-palette-btn-sec-hover: var(--text-main);
    --global-palette-btn-sec-border: var(--border-color);
    --global-palette-btn-sec-border-hover: var(--border-color);
    --global-palette-highlight: var(--text-error);
    --global-palette-highlight-alt: var(--highlight-selected);
    --global-palette-highlight-alt2: var(--highlight-related);
}

@supports (color: color-mix(in srgb, red, blue)) {
    .sudoku-container-wrap {
        --highlight-selected: color-mix(in srgb, var(--primary-color) 12%, #ffffff);
        --highlight-related: color-mix(in srgb, var(--primary-color) 4%, #ffffff);
        --highlight-match: color-mix(in srgb, var(--primary-color) 8%, #ffffff);
    }
}

/* Game Intro block at the very top */
.sudoku-game-intro {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(30, 41, 59, 0.08);
}

@supports (color: color-mix(in srgb, red, blue)) {
    .sudoku-game-intro {
        border-bottom: 1px solid color-mix(in srgb, currentColor 8%, transparent);
    }
}

.sudoku-game-heading {
    font-size: 1.6rem;
    font-weight: 800;
    margin: 0 0 6px 0 !important;
    color: var(--primary-color) !important;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.sudoku-game-description {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin: 0 !important;
    line-height: 1.5;
}

/* Header & Greeting */
.sudoku-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 25px;
    border-bottom: 1px solid rgba(30, 41, 59, 0.08);
    padding-bottom: 20px;
}

@supports (color: color-mix(in srgb, red, blue)) {
    .sudoku-header {
        border-bottom: 1px solid color-mix(in srgb, currentColor 8%, transparent);
    }
}

.sudoku-greeting {
    font-size: 1.15rem;
    font-weight: 600;
    color: inherit;
}

.greeting-text {
    color: inherit;
}

.sudoku-mode-selector {
    display: flex;
    background: rgba(30, 41, 59, 0.04);
    padding: 4px;
    border-radius: 12px;
    border: 1px solid rgba(30, 41, 59, 0.08);
}

@supports (color: color-mix(in srgb, red, blue)) {
    .sudoku-mode-selector {
        background: color-mix(in srgb, currentColor 4%, transparent);
        border: 1px solid color-mix(in srgb, currentColor 8%, transparent);
    }
}

.sudoku-mode-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    font-family: inherit;
    transition: all var(--transition-speed) ease;
}

.sudoku-mode-btn:hover {
    color: var(--text-main);
}

.sudoku-mode-btn.active {
    background: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

@supports (color: color-mix(in srgb, red, blue)) {
    .sudoku-mode-btn.active {
        box-shadow: 0 4px 12px color-mix(in srgb, var(--primary-color) 30%, transparent);
    }
}

.daily-star {
    color: #fbbf24;
}

/* Upper Toolbar */
.sudoku-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    background: var(--bg-card);
    padding: 12px 20px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 15px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.control-group label {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.sudoku-toolbar select {
    background: var(--bg-dark);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 10px;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    transition: border var(--transition-speed);
}

.sudoku-toolbar select:focus {
    border-color: var(--primary-color);
}

.sudoku-daily-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.daily-badge {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #0f172a;
    font-weight: 700;
    font-size: 0.75rem;
    padding: 4px 8px;
    border-radius: 6px;
    letter-spacing: 0.05em;
}

.daily-date {
    font-weight: 600;
    color: #fbbf24;
    font-size: 0.95rem;
}

.timer-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    padding: 6px 14px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

#sudoku-timer {
    font-family: monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    min-width: 72px;
    width: auto;
    white-space: nowrap;
    text-align: center;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color var(--transition-speed);
}

.icon-btn:hover {
    color: #fff;
}

/* Layout Grid */
.sudoku-main-layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 30px;
}

/* Board styling */
.sudoku-board-column {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sudoku-board-outer {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    background: var(--border-thick);
    border-radius: 16px;
    padding: 3px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    box-sizing: border-box;
}

.sudoku-board-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    grid-template-rows: repeat(9, 1fr);
    width: 100%;
    height: 100%;
    background: var(--border-color);
    gap: 1px;
    border-radius: 13px;
    overflow: hidden;
}

.sudoku-cell {
    position: relative;
    background: var(--bg-cell);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    outline: none;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

/* Cell borders for 3x3 blocks */
.sudoku-cell[data-col="2"],
.sudoku-cell[data-col="5"] {
    border-right: 3px solid var(--border-thick) !important;
}

.sudoku-cell[data-row="2"],
.sudoku-cell[data-row="5"] {
    border-bottom: 3px solid var(--border-thick) !important;
}

.cell-value {
    font-size: clamp(1.4rem, 4vw, 2.1rem);
    font-weight: 500;
    transition: transform 0.15s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Given values style */
.sudoku-cell.given {
    background: var(--bg-cell-given);
    cursor: not-allowed;
}

.sudoku-cell.given .cell-value {
    font-weight: 700;
    color: var(--text-given);
}

/* User inserted style */
.sudoku-cell.user-inserted .cell-value {
    color: var(--text-user);
}

/* Error styles */
.sudoku-cell.error {
    background-color: #fee2e2 !important;
    /* light red */
    box-shadow: inset 0 0 0 2px #f87171 !important;
    /* soft red border */
}

.sudoku-cell.error .cell-value {
    color: #ef4444 !important;
    /* bright red text */
    font-weight: 700 !important;
}

/* Conflict styles (Red shade) */
.sudoku-cell.conflict {
    background-color: #fee2e2 !important;
    /* light red */
    box-shadow: inset 0 0 0 2px #f87171 !important;
    /* soft red border */
}

.sudoku-cell.conflict .cell-value {
    color: #ef4444 !important;
    /* bright red text */
    font-weight: 700 !important;
}

/* Conflict on a given (pre-filled) clue cell — red background only, keep text readable */
.sudoku-cell.conflict-given {
    background-color: #fee2e2 !important;
    box-shadow: inset 0 0 0 2px #f87171 !important;
}

/* Highlights */
.sudoku-cell.highlight-selected {
    background-color: var(--highlight-selected) !important;
    box-shadow: inset 0 0 0 2px var(--primary-color) !important;
}

.sudoku-cell.highlight-related {
    background-color: var(--highlight-related) !important;
}

.sudoku-cell.highlight-match {
    background-color: var(--highlight-match) !important;
}

.sudoku-cell.highlight-incorrect-flash {
    animation: cellFlashError 0.4s ease;
}

@keyframes cellFlashError {

    0%,
    100% {
        background: var(--bg-cell);
    }

    50% {
        background: rgba(239, 68, 68, 0.4);
    }
}

/* Notes / Pencil Marks */
.pencil-marks-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    padding: 3px;
    box-sizing: border-box;
    pointer-events: none;
    /* Let clicks pass to cell */
}

.pencil-mark {
    font-size: clamp(0.55rem, 1.2vw, 0.75rem);
    color: var(--text-muted);
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.1s ease;
}

.pencil-mark.active {
    opacity: 1;
}

/* Hide value when marks are present or vice versa */
.sudoku-cell.has-value .pencil-marks-grid {
    display: none;
}

/* Pause Overlay */
.board-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-main);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 13px;
    z-index: 10;
}

.overlay-content {
    text-align: center;
    padding: 20px;
    width: 100%;
}

.overlay-icon {
    font-size: 3rem;
    color: var(--primary-color);
    display: block;
    margin-bottom: 15px;
}

.overlay-content h3 {
    margin: 0 0 20px 0;
    font-size: 1.5rem;
    font-weight: 600;
}

/* Action Toolbar */
.sudoku-actions-toolbar {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
}

.tool-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: 12px;
    padding: 10px 5px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    font-family: inherit;
    transition: all var(--transition-speed);
    position: relative;
}

.tool-btn:hover {
    background: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
    color: #ffffff !important;
}

.tool-icon {
    font-size: 1.3rem;
}

.tool-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: color var(--transition-speed);
}

.tool-btn:hover .tool-label {
    color: #ffffff !important;
}

.tool-btn:hover .tool-icon svg {
    fill: #ffffff !important;
}

/* Notes Badge */
.notes-status-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: #475569;
    color: #fff;
    font-size: 0.6rem;
    font-weight: 700;
    padding: 2px 5px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
}

.tool-btn.active-notes {
    background: rgba(139, 92, 246, 0.2);
    border-color: var(--primary-color);
}

.tool-btn.active-notes .notes-status-badge {
    background: #10b981;
    /* Green ON */
}

/* Right side column controls */
.sudoku-controls-column {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

/* Keypad Grid */
.sudoku-keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.keypad-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    font-size: 1.8rem;
    font-weight: 600;
    border-radius: 16px;
    aspect-ratio: 1.3 / 1;
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.keypad-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 6px 15px rgba(139, 92, 246, 0.3);
    transform: translateY(-2px);
}

.keypad-btn:active {
    transform: translateY(0);
}

/* Action Buttons & Utilities */
.sudoku-action-btn {
    width: 100%;
    padding: 12px 20px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    font-family: inherit;
    border: 1px solid var(--global-palette-btn-sec-border, var(--border-color));
    background: var(--global-palette-btn-sec-bg, var(--bg-card));
    color: var(--global-palette-btn-sec, var(--text-main));
    transition: all var(--transition-speed);
    text-align: center;
}

.sudoku-action-btn:hover {
    background: var(--global-palette-btn-sec-bg-hover, rgba(30, 41, 59, 0.08));
    color: var(--global-palette-btn-sec-hover, var(--text-main));
}

@supports (color: color-mix(in srgb, red, blue)) {
    .sudoku-action-btn:hover {
        background: var(--global-palette-btn-sec-bg-hover, color-mix(in srgb, currentColor 8%, transparent));
    }
}

.sudoku-action-btn.primary-btn {
    background: var(--global-palette-btn-bg, var(--primary-color));
    border-color: var(--global-palette-btn-bg, var(--primary-color));
    color: var(--global-palette-btn, #fff);
    box-shadow: 0 4px 12px var(--global-palette-highlight-alt, rgba(139, 92, 246, 0.25));
}

.sudoku-action-btn.primary-btn:hover {
    background: var(--global-palette-btn-bg-hover, var(--primary-color-hover));
    border-color: var(--global-palette-btn-bg-hover, var(--primary-color-hover));
    color: var(--global-palette-btn-hover, #fff);
    box-shadow: 0 6px 16px var(--global-palette-highlight-alt, rgba(139, 92, 246, 0.4));
}

.sudoku-utility-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.utility-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.sudoku-icon-text-btn {
    background: var(--global-palette-btn-sec-bg, var(--bg-card));
    border: 1px solid var(--global-palette-btn-sec-border, var(--border-color));
    color: var(--global-palette-btn-sec, var(--text-main));
    border-radius: 12px;
    padding: 10px;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    font-family: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all var(--transition-speed);
}

.sudoku-icon-text-btn:hover {
    background: var(--global-palette-btn-sec-bg-hover, rgba(30, 41, 59, 0.08));
    color: var(--global-palette-btn-sec-hover, var(--text-main));
    border-color: var(--global-palette-btn-sec-border-hover, var(--border-color));
}

/* Print options & Paper size select */
.sudoku-print-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}

.print-size-selector-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    width: 100%;
}

.print-size-selector-wrap label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.print-size-selector-wrap select {
    background: var(--bg-dark);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 10px;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    transition: border var(--transition-speed);
    font-size: 0.85rem;
    width: auto;
}

.print-size-selector-wrap select:focus {
    border-color: var(--primary-color);
}

/* Auto-Check switch toggle */
.toggle-control-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.toggle-label-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Switch Slider styling */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-thick);
    transition: .3s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
}

input:checked+.slider {
    background-color: #10b981;
    /* Green toggle */
}

input:focus+.slider {
    box-shadow: 0 0 1px #10b981;
}

input:checked+.slider:before {
    transform: translateX(20px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

/* Leaderboard Card */
.sudoku-leaderboard-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.leaderboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 10px;
}

.leaderboard-header h4 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.difficulty-tag {
    font-size: 0.75rem;
    font-weight: 700;
    background: rgba(139, 92, 246, 0.15);
    color: var(--primary-color);
    padding: 3px 8px;
    border-radius: 6px;
    text-transform: capitalize;
}

.leaderboard-table-container {
    max-height: 250px;
    overflow-y: auto;
}

#leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

#leaderboard-table th {
    text-align: left;
    color: var(--text-muted);
    font-weight: 600;
    padding: 8px 10px;
    border-bottom: 1px solid var(--border-color);
}

#leaderboard-table td {
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    color: inherit;
}

#leaderboard-table tbody tr:hover td {
    background: rgba(30, 41, 59, 0.03);
}

@supports (color: color-mix(in srgb, red, blue)) {
    #leaderboard-table tbody tr:hover td {
        background: color-mix(in srgb, currentColor 3%, transparent);
    }
}

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

/* Modals styles */
.sudoku-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    /* Ensure high layer above WP Admin bars */
}

.sudoku-modal-content {
    background: var(--wp--preset--color--background, var(--wp--preset--color--base, #ffffff));
    color: inherit;
    border: 1px solid var(--border-color);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    border-radius: 24px;
    padding: 24px;
    width: 90%;
    max-width: 380px;
    position: relative;
    box-sizing: border-box;
    max-height: 90vh;
    max-height: 90dvh;
    overflow-y: auto;
    animation: modalScaleIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.sudoku-modal-content::-webkit-scrollbar {
    width: 6px;
}

.sudoku-modal-content::-webkit-scrollbar-track {
    background: transparent;
}

.sudoku-modal-content::-webkit-scrollbar-thumb {
    background-color: var(--border-thick);
    border-radius: 10px;
}

@keyframes modalScaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 1.8rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition-speed);
    z-index: 10;
}

.modal-close:hover {
    color: var(--primary-color);
}

/* GameOver Stats UI */
.gameover-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 15px 0;
}

.stat-box {
    background: rgba(30, 41, 59, 0.03);
    border-radius: 12px;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
}

@supports (color: color-mix(in srgb, red, blue)) {
    .stat-box {
        background: color-mix(in srgb, currentColor 3%, transparent);
    }
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
}

.stat-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: inherit;
}

/* Animations */
.trophy-icon {
    font-size: 4.5rem;
    color: #fbbf24;
    animation: bounceTrophy 1.5s infinite;
}

@keyframes bounceTrophy {

    0%,
    100% {
        transform: translateY(0) scale(1);
    }

    50% {
        transform: translateY(-10px) scale(1.05);
    }
}

.broken-heart-icon {
    font-size: 4.5rem;
    color: #ef4444;
    animation: heartbeat 1.5s infinite;
}

@keyframes heartbeat {

    0%,
    100% {
        transform: scale(1);
    }

    25% {
        transform: scale(1.1);
    }

    40% {
        transform: scale(1);
    }

    60% {
        transform: scale(1.1);
    }
}

.score-submission-section {
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
    margin-top: 15px;
}

.flow-info {
    color: #10b981;
    font-weight: 600;
    margin-bottom: 12px;
}

.flow-prompt {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    line-height: 1.4;
}

.modal-auth-tabs {
    display: flex;
    background: rgba(30, 41, 59, 0.04);
    padding: 4px;
    border-radius: 10px;
    margin-bottom: 12px;
}

@supports (color: color-mix(in srgb, red, blue)) {
    .modal-auth-tabs {
        background: color-mix(in srgb, currentColor 4%, transparent);
    }
}

.auth-tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    font-family: inherit;
    transition: all var(--transition-speed);
}

.auth-tab-btn.active {
    background: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.modal-auth-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group input:not([type="checkbox"]) {
    width: 100%;
    background: rgba(30, 41, 59, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 8px 12px;
    color: inherit;
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    box-sizing: border-box;
    transition: border var(--transition-speed);
}

@supports (color: color-mix(in srgb, red, blue)) {
    .form-group input:not([type="checkbox"]) {
        background: color-mix(in srgb, currentColor 3%, transparent);
    }
}

.form-group input:not([type="checkbox"]):focus {
    border-color: var(--primary-color);
}

.form-group input[type="checkbox"] {
    width: auto;
    cursor: pointer;
    margin: 0;
    accent-color: var(--primary-color);
}

.auth-error-msg {
    color: #ef4444;
    font-size: 0.8rem;
    text-align: left;
    margin-bottom: 5px;
    line-height: 1.3;
}

.guest-skip-row {
    margin-top: 15px;
}

.text-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    text-decoration: underline;
}

.text-btn:hover {
    color: var(--primary-color);
}

.w-100 {
    width: 100% !important;
}

/* Helpers */
.hidden {
    display: none !important;
}

/* Print Header and Footer (hidden on screen) */
.sudoku-print-header,
.sudoku-print-footer {
    display: none !important;
}

/* Print CSS Stylesheet */
@media print {
    @page {
        margin: 0 !important;
        size: letter portrait;
    }

    html {
        overflow: visible !important;
    }

    body {
        margin: 0 !important;
        padding: 0 !important;
        background: #ffffff !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
        overflow: visible !important;
    }

    /* Reset theme ancestors so they don't break print layouts or backgrounds */
    .sudoku-print-ancestor {
        display: block !important;
        position: static !important;
        margin: 0 !important;
        padding: 0 !important;
        background: transparent !important;
        box-shadow: none !important;
        border: none !important;
        width: auto !important;
        height: auto !important;
        max-width: none !important;
        max-height: none !important;
        min-height: 0 !important;
        min-width: 0 !important;
        transform: none !important;
        overflow: visible !important;
    }

    /* Print page styling to fit exactly 1 page */
    .sudoku-print-page {
        page-break-after: always !important;
        break-after: page !important;
        height: auto !important;
        min-height: 100vh !important;
        padding: 40px 60px !important;
        display: block !important;
        background: #ffffff !important;
        box-sizing: border-box !important;
        overflow: visible !important;
    }

    /* Solution page: hidden by default in print, shown via JS inline style when checkbox is ticked.
       Note: Do NOT use display:none !important here — it prevents JS from overriding it. */
    #sudoku-solution-container {
        display: none;
        page-break-before: always !important;
        break-before: page !important;
        height: auto !important;
        min-height: 100vh !important;
        padding: 40px 60px !important;
        background: #ffffff !important;
        box-sizing: border-box !important;
        overflow: visible !important;
    }

    /* Fallback for browsers that support class-based toggling without JS inline styles */
    .show-solution-print #sudoku-solution-container {
        display: block;
    }

    .sudoku-container-wrap {
        position: relative !important;
        left: auto !important;
        top: auto !important;
        width: 100% !important;
        height: auto !important;
        min-height: 100% !important;
        background: #ffffff !important;
        box-shadow: none !important;
        border: none !important;
        padding: 0 !important;
        margin: 0 !important;
        overflow: visible !important;
    }

    .sudoku-main-layout {
        display: block !important;
    }

    .sudoku-board-column {
        width: 100% !important;
        max-width: none !important;
        margin: 0 !important;
        padding: 0 !important;
    }

    .print-hidden,
    .sudoku-controls-column,
    .sudoku-header,
    .sudoku-toolbar,
    .sudoku-actions-toolbar,
    .board-overlay,
    .sudoku-google-signin-wrapper,
    .sudoku-leaderboard-section,
    .sudoku-calendar-card,
    .sudoku-auth-form-card {
        display: none !important;
    }

    /* Print board size constraints to avoid spilling onto pages */
    .sudoku-board-outer {
        width: 580px !important;
        height: 580px !important;
        margin: 30px auto !important;
        padding: 0 !important;
        border: none !important;
        background: none !important;
        border-radius: 0 !important;
        aspect-ratio: auto !important;
        box-shadow: none !important;
    }

    .sudoku-board-grid {
        border: 4px solid #000000 !important;
        background: #ffffff !important;
        border-radius: 0 !important;
        width: 100% !important;
        height: 100% !important;
        gap: 0 !important;
    }

    .sudoku-cell {
        background: #ffffff !important;
        color: #000000 !important;
        border-top: 1px solid #777777 !important;
        border-left: 1px solid #777777 !important;
        border-right: none !important;
        border-bottom: none !important;
        border-radius: 0 !important;
    }

    /* Thick borders for 3x3 box dividers */
    .sudoku-cell[data-col="2"],
    .sudoku-cell[data-col="5"] {
        border-right: 3px solid #000000 !important;
    }

    .sudoku-cell[data-row="2"],
    .sudoku-cell[data-row="5"] {
        border-bottom: 3px solid #000000 !important;
    }

    /* Remove left/top borders next to thick dividers to prevent doubling */
    .sudoku-cell[data-col="3"],
    .sudoku-cell[data-col="6"] {
        border-left: none !important;
    }

    .sudoku-cell[data-row="3"],
    .sudoku-cell[data-row="6"] {
        border-top: none !important;
    }

    /* Outer edges touch the 4px container border, so they don't need cell borders */
    .sudoku-cell[data-row="0"] {
        border-top: none !important;
    }

    .sudoku-cell[data-col="0"] {
        border-left: none !important;
    }

    .cell-value {
        color: #000 !important;
        font-weight: bold !important;
        font-size: 2.6rem !important;
    }

    .pencil-marks-grid {
        display: none !important;
    }

    .sudoku-print-header {
        display: block !important;
        text-align: center !important;
        margin-bottom: 20px !important;
        border-bottom: 2px solid #000 !important;
        padding-bottom: 10px !important;
    }

    .sudoku-print-header .print-site-title {
        font-size: 24px !important;
        font-weight: bold !important;
        margin-bottom: 5px !important;
        color: #000 !important;
        text-transform: uppercase !important;
        letter-spacing: 1px !important;
    }

    .sudoku-print-header .print-site-url {
        font-size: 13px !important;
        color: #555 !important;
        margin-bottom: 5px !important;
        text-decoration: none !important;
    }

    .sudoku-print-header .print-datetime {
        font-size: 11px !important;
        color: #666 !important;
    }

    .sudoku-print-footer {
        display: block !important;
        text-align: center !important;
        border-top: 1px solid #000 !important;
        padding-top: 10px !important;
        font-size: 13px !important;
        color: #444 !important;
    }

    .sudoku-print-footer span {
        font-weight: bold !important;
        color: #000 !important;
    }
}

/* Responsive adjust for mobile */
@media (max-width: 768px) {
    .sudoku-container-wrap {
        padding: 15px;
        border-radius: 16px;
    }

    .sudoku-main-layout {
        display: grid;
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .sudoku-board-column,
    .sudoku-controls-column {
        display: contents;
    }

    /* CSS Grid Ordering for Mobile Layout Integration */
    .sudoku-board-outer {
        order: 1;
    }

    .sudoku-actions-toolbar {
        order: 2;
    }

    .sudoku-keypad {
        order: 3;
    }

    .sudoku-utility-buttons {
        order: 4;
    }

    .toggle-control-row {
        order: 5;
    }

    .sudoku-calendar-card {
        order: 6;
    }

    .sudoku-leaderboard-card {
        order: 7;
    }

    .sudoku-author-credit {
        order: 8;
        margin-top: 5px !important;
        margin-bottom: 5px !important;
    }

    .sudoku-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .sudoku-mode-selector {
        width: 100%;
    }

    .sudoku-mode-btn {
        flex: 1;
        text-align: center;
    }

    .keypad-btn {
        font-size: 1.5rem;
        padding: 12px;
    }

    .cell-value {
        font-size: 1.5rem;
    }
}

/* Extra small screen optimization (mobile devices under 480px) */
@media (max-width: 480px) {
    .sudoku-container-wrap {
        padding: 12px;
        border-radius: 12px;
    }

    .sudoku-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        padding: 12px;
    }

    .sudoku-toolbar .control-group {
        justify-content: space-between;
    }

    .sudoku-stats-counters {
        justify-content: space-between !important;
        width: 100% !important;
    }

    .timer-wrap {
        justify-content: center;
        width: 100%;
    }

    .sudoku-actions-toolbar {
        gap: 6px;
    }

    .tool-btn {
        padding: 8px 4px;
        border-radius: 8px;
    }

    .tool-icon {
        font-size: 1.15rem;
    }

    .tool-label {
        font-size: 0.65rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 100%;
    }

    .sudoku-keypad {
        gap: 8px;
    }

    .keypad-btn {
        font-size: 1.35rem;
        padding: 8px;
        border-radius: 10px;
    }

    .sudoku-utility-buttons {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .sudoku-utility-buttons .sudoku-print-options {
        grid-column: span 2;
    }

    .print-size-selector-wrap select {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .sudoku-action-btn {
        padding: 10px 12px;
        font-size: 0.85rem;
        border-radius: 10px;
    }

    .toggle-control-row {
        justify-content: center;
        width: 100%;
        margin-top: 5px;
    }

    .sudoku-calendar-card {
        padding: 12px;
    }

    .calendar-header h4 {
        font-size: 0.85rem;
    }

    #calendar-month-year-label {
        font-size: 0.8rem;
        min-width: 75px;
    }

    .calendar-nav-btn {
        font-size: 1rem;
    }

    .calendar-weekdays {
        font-size: 0.7rem;
    }

    .calendar-day {
        font-size: 0.75rem;
        border-radius: 4px;
    }

    .sudoku-leaderboard-card {
        padding: 12px;
    }

    .leaderboard-header h4 {
        font-size: 0.95rem;
    }

    .difficulty-tag {
        font-size: 0.7rem;
        padding: 2px 6px;
    }

    .leaderboard-table-container {
        overflow-x: auto;
    }

    #leaderboard-table th,
    #leaderboard-table td {
        padding: 6px 4px;
        font-size: 0.75rem;
    }

    #leaderboard-table th {
        white-space: nowrap;
    }

    #leaderboard-table td:nth-child(2) {
        max-width: 80px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    #leaderboard-table td.text-center {
        white-space: normal;
    }
}

@media (max-width: 400px) {
    .cell-value {
        font-size: 1.3rem;
    }

    .pencil-mark {
        font-size: 0.5rem;
    }
}

/* Google Sign-in Styling */
.sudoku-google-signin-wrapper {
    margin-top: 20px;
    text-align: center;
}

.google-divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 15px 0;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 500;
}

.google-divider::before,
.google-divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.google-divider:not(:empty)::before {
    margin-right: .5em;
}

.google-divider:not(:empty)::after {
    margin-left: .5em;
}

.google-btn-container {
    display: flex;
    justify-content: center;
    width: 100%;
}

/* SVG Icon and Custom Modal Alignments */
.tool-icon svg,
.play-icon svg,
.pause-icon svg,
.overlay-icon svg,
.daily-star svg,
.sound-icon-on svg,
.sound-icon-off svg,
.btn-svg-icon,
.sound-svg-icon {
    display: inline-block;
    vertical-align: middle;
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.tool-icon svg {
    margin: 0 auto;
}

.sound-icon-on svg,
.sound-icon-off svg {
    width: 16px;
    height: 16px;
}

.custom-dialog-modal {
    max-width: 400px;
}

.custom-modal-actions .sudoku-action-btn {
    padding: 10px 20px;
    font-size: 0.95em;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.custom-modal-actions .sudoku-action-btn:active {
    transform: scale(0.98);
}

/* Start Overlay responsive styling for mobile screen sizes */
@media (max-width: 480px) {
    #start-old-user-flow {
        flex-direction: column !important;
        align-items: center !important;
        gap: 8px !important;
    }

    #start-old-user-flow button,
    #start-new-user-flow button {
        width: 100% !important;
        max-width: 200px;
        justify-content: center !important;
    }

    #start-overlay-title {
        font-size: 1.15rem !important;
        margin-bottom: 15px !important;
    }

    .board-overlay h3 {
        font-size: 1.15rem !important;
    }

    .overlay-icon svg {
        width: 38px !important;
        height: 38px !important;
    }
}

/* 2-Column Game Over Modal styling for bigger screens */
#sudoku-modal-gameover .sudoku-modal-content {
    max-width: 760px;
    width: 90%;
}

.gameover-layout-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: center;
}

.gameover-column-left {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.gameover-column-right {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.gameover-column-right .score-submission-section {
    border-top: none !important;
    padding-top: 0 !important;
    margin-top: 0 !important;
    border-left: 1px solid var(--border-color);
    padding-left: 30px;
}

/* Stacking layout for mobile screens */
@media (max-width: 768px) {
    #sudoku-modal-gameover .sudoku-modal-content {
        max-width: 420px;
    }

    .gameover-layout-wrapper {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .gameover-column-right .score-submission-section {
        border-left: none !important;
        padding-left: 0 !important;
        border-top: 1px solid var(--border-color) !important;
        padding-top: 15px !important;
        margin-top: 15px !important;
    }
}

.sudoku-solution-page-wrap {
    display: none !important;
}

/* Daily Progress Calendar Card */
.sudoku-calendar-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    margin-top: 20px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.calendar-header h4 {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
}

.calendar-month-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.calendar-nav-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
    font-weight: bold;
    transition: transform 0.15s ease;
}

.calendar-nav-btn:hover {
    transform: scale(1.2);
}

#calendar-month-year-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    min-width: 90px;
    text-align: center;
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-weight: 700;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-main);
    border-radius: 6px;
    position: relative;
    background-color: var(--bg-cell);
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.calendar-day:not(.empty):hover {
    background-color: var(--primary-color);
    color: #ffffff;
    cursor: default;
}

.calendar-day.empty {
    background: none;
    border: none;
}

.calendar-day.win {
    background-color: #22c55e !important;
    border-color: #16a34a !important;
    color: #ffffff !important;
}

.calendar-day.lose {
    background-color: #ef4444 !important;
    border-color: #dc2626 !important;
    color: #ffffff !important;
}

.calendar-day.locked {
    background-color: var(--bg-cell-given);
    border-color: var(--border-color);
    color: var(--text-muted) !important;
    opacity: 0.85;
}

.calendar-day.locked:hover {
    background-color: var(--bg-cell-given) !important;
    color: var(--text-muted) !important;
    cursor: not-allowed;
}

.calendar-day.locked .lock-icon {
    color: var(--text-muted);
}

.cal-status-icon {
    font-size: 0.65rem;
    line-height: 1;
    margin-top: 1px;
    font-weight: bold;
}

.day-num {
    line-height: 1;
}

.calendar-guest-overlay {
    text-align: center;
    padding: 12px 6px;
}

.calendar-guest-overlay p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* Hide on screen during printing */
@media print {
    .sudoku-calendar-card {
        display: none !important;
    }
}

/* Custom Checkbox Design */
.custom-checkbox-container {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.95em;
    color: var(--text-main);
    font-weight: 500;
    -webkit-user-select: none;
    user-select: none;
}

.custom-checkbox-container input {
    display: none !important;
}

.custom-checkbox-box {
    width: 20px;
    height: 20px;
    background-color: var(--bg-cell);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    display: inline-block;
    position: relative;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.custom-checkbox-container:hover .custom-checkbox-box {
    border-color: var(--primary-color);
}

.custom-checkbox-container input:checked~.custom-checkbox-box {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.custom-checkbox-box:after {
    content: "";
    position: absolute;
    display: none;
}

.custom-checkbox-container input:checked~.custom-checkbox-box:after {
    display: block;
}

.custom-checkbox-container .custom-checkbox-box:after {
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid #ffffff;
    border-width: 0 2.5px 2.5px 0;
    transform: rotate(45deg);
}

/* Calendar Skeleton Loading */
@keyframes skeleton-pulse {

    0%,
    100% {
        opacity: 0.65;
    }

    50% {
        opacity: 0.25;
    }
}

.skeleton-day {
    animation: skeleton-pulse 1.2s infinite ease-in-out;
    background-color: #cbd5e1 !important;
    border-radius: 6px;
    aspect-ratio: 1;
    cursor: wait;
}

@supports (color: color-mix(in srgb, red, blue)) {
    .skeleton-day {
        background-color: color-mix(in srgb, var(--text-main) 12%, transparent) !important;
    }
}