/**
 * Sudoku 4x4 – styles for index and wzor pages.
 */

/* Same .wrap width for index and wzor */
.page-sudoku .wrap {
    max-width: 960px;
}

/* Hide visually, keep for screen readers and SEO */
.page-sudoku .visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.page-sudoku .intro,
.page-sudoku .intro-print {
    color: #64748b;
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.page-sudoku .sudoku-size-section {
    margin-bottom: 40px;
}

.page-sudoku .sudoku-size-section:last-of-type {
    margin-bottom: 24px;
}

.page-sudoku .sudoku-size-heading {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0f172a;
    margin: 0 0 8px 0;
    padding-bottom: 8px;
    border-bottom: 2px solid #e2e8f0;
}

.page-sudoku .intro-print {
    text-align: center;
    margin: -16px 0 16px 0;
}

/* Difficulty levels section (index) */
.page-sudoku .difficulty-levels {
    margin: 28px 0 32px 0;
}

/* Heading hierarchy: H1 largest, then H2, then H3 (each clearly distinct from body text) */
.page-sudoku h1,
.page-sudoku .page-heading {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 24px 0;
    color: #1a365d;
    text-align: center;
}
.page-sudoku h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0f172a;
}
.page-sudoku h3 {
    font-size: 1.25rem;
    font-weight: 700; /* strong / bold */
    color: #334155;
}

.page-sudoku .difficulty-levels-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 8px 0;
    color: #0f172a;
}

.page-sudoku .difficulty-levels-intro {
    margin: 0 0 20px 0;
    color: #475569;
    font-size: 0.95rem;
    line-height: 1.5;
}

.page-sudoku .difficulty-level {
    position: relative;
    margin-bottom: 28px;
    padding: 18px 20px;
    background: #f8fafc;
    border-radius: 8px;
    border-left: 4px solid #64748b;
}

.page-sudoku .difficulty-level-content {
    min-width: 0;
    padding-right: 184px;
}

/* Desktop: thumb in top-right corner */
.page-sudoku .difficulty-level-thumb-link {
    position: absolute;
    top: 18px;
    right: 20px;
    display: block;
    margin: 0;
    line-height: 0;
    border-radius: 8px;
    overflow: hidden;
    background: #fff;
    border: 1px solid #e2e8f0;
    width: fit-content;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.page-sudoku .difficulty-level-thumb-cta-wrap {
    margin-top: 0;
}

/* Mobile: thumb above CTA button, in flow */
@media (max-width: 560px) {
    .page-sudoku .difficulty-level-content {
        padding-right: 0;
    }
    .page-sudoku .difficulty-level-thumb-link {
        position: static;
    }
    .page-sudoku .difficulty-level-thumb-cta-wrap {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .page-sudoku .difficulty-level-thumb-cta-wrap .difficulty-level-cta {
        margin-top: 0;
    }
}

.page-sudoku .difficulty-level-thumb-link:hover {
    border-color: #94a3b8;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.page-sudoku .difficulty-level-thumb {
    display: block;
}

.page-sudoku .difficulty-level-thumb img {
    display: block;
    width: 160px;
    height: 160px;
    object-fit: contain;
    background: #fff;
}

/* Single level view (wzor): heading above content, not side by side */
.page-sudoku .difficulty-levels-single .difficulty-level {
    flex-direction: column;
    gap: 4px;
}
.page-sudoku .difficulty-levels-single .difficulty-levels-title {
    width: 100%;
    margin-bottom: 0;
}

.page-sudoku .difficulty-level-easy { border-left-color: #22c55e; }
.page-sudoku .difficulty-level-medium { border-left-color: #f59e0b; }
.page-sudoku .difficulty-level-hard { border-left-color: #ef4444; }

.page-sudoku .difficulty-level-title {
    font-size: inherit;
    font-weight: 700; /* bold so H3 stays visually strong */
    margin: 0 0 8px 0;
    color: inherit;
}

.page-sudoku .difficulty-level-link-heading {
    color: inherit;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s, color 0.2s;
}

.page-sudoku .difficulty-level-link-heading:hover {
    color: #0f172a;
    border-bottom-color: currentColor;
}

.page-sudoku .difficulty-level-easy .difficulty-level-link-heading:hover { color: #16a34a; }
.page-sudoku .difficulty-level-medium .difficulty-level-link-heading:hover { color: #d97706; }
.page-sudoku .difficulty-level-hard .difficulty-level-link-heading:hover { color: #dc2626; }

.page-sudoku .difficulty-level-cta {
    margin: 16px 0 0 0;
}

.page-sudoku .difficulty-level-cta-link {
    display: inline-block;
    padding: 10px 16px;
    background: #0f172a;
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 8px;
    transition: background 0.2s, transform 0.15s;
}

.page-sudoku .difficulty-level-cta-link:hover {
    background: #1e293b;
}

.page-sudoku .difficulty-level-easy .difficulty-level-cta-link { background: #15803d; }
.page-sudoku .difficulty-level-easy .difficulty-level-cta-link:hover { background: #16a34a; }
.page-sudoku .difficulty-level-medium .difficulty-level-cta-link { background: #b45309; }
.page-sudoku .difficulty-level-medium .difficulty-level-cta-link:hover { background: #d97706; }
.page-sudoku .difficulty-level-hard .difficulty-level-cta-link { background: #b91c1c; }
.page-sudoku .difficulty-level-hard .difficulty-level-cta-link:hover { background: #dc2626; }

.page-sudoku .difficulty-level-audience {
    margin-bottom: 0.5em;
    padding: 0.35em 0.5em;
    background: rgba(0, 0, 0, 0.04);
    border-radius: 4px;
    font-size: 0.95em;
}
.page-sudoku .difficulty-level-meta,
.page-sudoku .difficulty-level-desc,
.page-sudoku .difficulty-level-subtitle,
.page-sudoku .difficulty-level-summary {
    margin: 0 0 10px 0;
    color: #475569;
    font-size: 0.9rem;
    line-height: 1.55;
}

.page-sudoku .difficulty-level-subtitle {
    font-weight: 600;
    color: #334155;
    margin-top: 12px;
}

.page-sudoku .difficulty-level-list {
    margin: 0 0 12px 0;
    padding-left: 1.35rem;
    color: #475569;
    font-size: 0.9rem;
    line-height: 1.55;
}

.page-sudoku .difficulty-level-list li {
    margin-bottom: 4px;
}

.page-sudoku .difficulty-levels-note {
    margin: 20px 0 0 0;
    padding: 14px 18px;
    background: #f1f5f9;
    border-radius: 8px;
    color: #475569;
    font-size: 0.9rem;
    line-height: 1.5;
    font-style: italic;
}

.page-sudoku .puzzle-list-heading {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 12px 0;
    color: #334155;
}

/* Single difficulty info (wzor.php) */
.page-sudoku .difficulty-info {
    margin: 24px 0;
    padding: 16px 20px;
    background: #f8fafc;
    border-radius: 8px;
    border-left: 4px solid #64748b;
}

.page-sudoku .difficulty-info-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 12px 0;
    color: #334155;
}

.page-sudoku .difficulty-list {
    margin: 0;
    padding-left: 1.25rem;
    color: #475569;
    font-size: 0.9rem;
    line-height: 1.5;
}

.page-sudoku .difficulty-list li {
    margin-bottom: 8px;
}

.page-sudoku .difficulty-list li:last-child {
    margin-bottom: 0;
}

.page-sudoku .difficulty-info-single {
    margin: 16px 0 24px 0;
}

.page-sudoku .difficulty-info-text {
    margin: 0;
    color: #475569;
    font-size: 0.9rem;
    line-height: 1.5;
}

.page-sudoku .puzzle-list {
    list-style: none;
    padding: 0;
    margin: 0 0 24px 0;
}

.page-sudoku .puzzle-list li {
    margin-bottom: 8px;
}

.page-sudoku .puzzle-list a {
    display: inline-block;
    padding: 8px 12px;
    background: #f1f5f9;
    border-radius: 6px;
    color: #0f172a;
    text-decoration: none;
    font-weight: 500;
}

.page-sudoku .puzzle-list a:hover {
    background: #e2e8f0;
}

/* Sudoku grid – screen */
.sudoku-wrap {
    display: inline-block;
    border: 2px solid #333;
    border-radius: 4px;
    overflow: hidden;
}

/* 6×6 grid: smaller cells (set --sudoku-cell-size in page, e.g. 36px) */
.sudoku-wrap-6x6 .sudoku-table-6x6 td {
    font-size: 1rem;
}
@media (max-width: 768px) {
    .sudoku-wrap-6x6 .sudoku-table-6x6 td {
        font-size: 0.9rem;
    }
}
@media (max-width: 480px) {
    .sudoku-wrap-6x6 .sudoku-table-6x6 td {
        font-size: 0.8rem;
    }
}

.sudoku-table {
    table-layout: fixed;
    border-collapse: collapse;
    border: none;
}

.sudoku-table td {
    width: var(--sudoku-cell-size, 48px);
    height: var(--sudoku-cell-size, 48px);
    min-width: var(--sudoku-cell-size, 48px);
    min-height: var(--sudoku-cell-size, 48px);
    box-sizing: border-box;
    border: 1px solid #999;
    text-align: center;
    vertical-align: middle;
    font-size: 1.25rem;
    font-weight: 700;
}

.sudoku-table .border-right-block {
    border-right-width: 2px;
    border-right-color: #333;
}

.sudoku-table .border-bottom-block {
    border-bottom-width: 2px;
    border-bottom-color: #333;
}

.sudoku-table .cell-empty {
    color: transparent;
    background: #fff;
}

.sudoku-table .cell-filled {
    color: #0f172a;
    background: #fff;
}

/* Teacher version: originally given numbers (from puzzle) – light shading */
.sudoku-table .cell-given {
    background: #f1f5f9;
    font-weight: 700;
    color: #0f172a;
}

.page-sudoku .grid-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 16px 0;
}

.page-sudoku .pages {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
    margin: 24px 0;
}

.page-sudoku .page {
    flex: 0 0 auto;
    padding: 16px;
    background: #fff;
}

.page-sudoku .page-print-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: center;
    justify-items: center;
}

/* Header spans full width so 6 grids flow as 3 rows x 2 columns (1 2 / 3 4 / 5 6) */
.page-sudoku .page-print-inner::before {
    grid-column: 1 / -1;
}

.page-sudoku .page .grid-container {
    margin: 0;
}

.page-sudoku .back-link.back-link-bottom {
    display: inline-block;
    margin-top: 24px;
}

.page-sudoku main > .back-link {
    margin-top: 1rem;
}

/* Anchor for "Generuj nowe sudoku" – leave space above when scrolling into view */
#regenerate-sudoku {
    scroll-margin-top: 1rem;
}

/* Regenerate button (link styled as button) – next to "Drukuj karty" */
.page-sudoku .action-bar .btn-regenerate {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    color: #1e40af;
    background: #fff;
    border: 2px solid #3b82f6;
    border-radius: 8px;
    text-decoration: none;
    box-sizing: border-box;
    transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.page-sudoku .action-bar .btn-regenerate:hover {
    background: #eff6ff;
    color: #1d4ed8;
    border-color: #2563eb;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}
.page-sudoku .action-bar .btn-regenerate:active {
    transform: translateY(1px);
}

/* How-to / rules section (wzor.php – below printable cards) */
.page-sudoku .sudoku-howto {
    margin: 28px 0 32px 0;
    padding: 20px 22px;
    background: #f8fafc;
    border-radius: 8px;
    border-left: 4px solid #64748b;
    width: 100%;
}

.page-sudoku .sudoku-howto h3 {
    font-size: 1.25rem;
    font-weight: 700; /* strong / bold */
    margin: 0 0 8px 0;
    color: #334155;
}

.page-sudoku .sudoku-howto h3:not(:first-child) {
    margin-top: 24px;
}

.page-sudoku .sudoku-howto p {
    margin: 0 0 10px 0;
    color: #475569;
    font-size: 0.9rem;
    line-height: 1.55;
}

.page-sudoku .sudoku-howto ul,
.page-sudoku .sudoku-howto ol {
    margin: 0 0 12px 0;
    padding-left: 1.35rem;
    color: #475569;
    font-size: 0.9rem;
    line-height: 1.55;
}

.page-sudoku .sudoku-howto li {
    margin-bottom: 4px;
}

.page-sudoku .sudoku-howto ol li {
    margin-bottom: 6px;
}

/* ----- wzor.php: cards section – desktop look above 500px; single column + compact spacing only below 500px ----- */
@media (max-width: 500px) {
    .page-sudoku .pages {
        gap: 20px;
        margin: 20px 0;
        padding: 16px 12px;
    }
    .page-sudoku .page {
        padding: 16px 12px;
    }
    .page-sudoku .page-print-inner {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .page-sudoku .page-print-inner::before {
        grid-column: 1;
    }
    .page-sudoku .grid-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        margin: 0 auto 8px;
        justify-content: center;
    }
}

/* ----- Mobile: layout, cards, action bar, howto. Heading hierarchy H1 > H2 > H3 ----- */
@media (max-width: 768px) {
    .page-sudoku .wrap {
        max-width: 100%;
        padding-left: 12px;
        padding-right: 12px;
    }
    body.page-sudoku h1,
    body.page-sudoku .page-heading {
        font-size: 1.65rem;
        font-weight: 700;
        margin-bottom: 20px;
    }
    body.page-sudoku h2,
    body.page-sudoku .difficulty-levels-title {
        font-size: 1.35rem;
        font-weight: 700;
    }
    body.page-sudoku h3,
    body    .page-sudoku .difficulty-level-title {
        font-size: 1.2rem;
        font-weight: 700;
    }
    /* Action bar: same layout and button behavior as desktop (horizontal, same padding) */
    .page-sudoku .action-bar {
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        justify-content: center;
        gap: 12px;
        margin-top: 24px;
    }
    .page-sudoku .action-bar .btn-print,
    .page-sudoku .action-bar .btn-regenerate {
        width: auto;
        min-height: 0;
        padding: 12px 20px;
        justify-content: center;
    }
    .page-sudoku .action-bar .back-link {
        display: block;
        text-align: center;
        padding: 12px;
        min-height: 44px;
        line-height: 1.4;
        box-sizing: border-box;
    }
    .page-sudoku .sudoku-howto {
        margin: 20px 0 24px 0;
        padding: 16px 14px;
    }
    body.page-sudoku .sudoku-howto h3 {
        font-size: 1.2rem;
        font-weight: 700;
    }
    .page-sudoku .sudoku-howto h3:not(:first-child) {
        margin-top: 20px;
    }
    .page-sudoku .sudoku-howto p,
    .page-sudoku .sudoku-howto ul,
    .page-sudoku .sudoku-howto ol {
        font-size: 0.875rem;
    }
    .page-sudoku .back-link.back-link-bottom {
        display: block;
        text-align: center;
        padding: 12px;
        min-height: 44px;
    }
    .page-sudoku main .back-link {
        display: inline-block;
        padding: 12px 16px;
        min-height: 44px;
        line-height: 1.4;
        box-sizing: border-box;
    }
    .page-sudoku main > .back-link {
        margin-top: 24px;
    }
}

@media (max-width: 480px) {
    .page-sudoku .wrap {
        padding-left: 10px;
        padding-right: 10px;
    }
    body.page-sudoku h1,
    body.page-sudoku .page-heading {
        font-size: 1.5rem;
        font-weight: 700;
        margin-bottom: 16px;
    }
    body.page-sudoku h2,
    body.page-sudoku .difficulty-levels-title {
        font-size: 1.25rem;
        font-weight: 700;
    }
    body.page-sudoku h3,
    body.page-sudoku .difficulty-level-title,
    body.page-sudoku .sudoku-howto h3 {
        font-size: 1.1rem;
        font-weight: 700;
    }
    .page-sudoku .pages {
        padding: 12px 8px;
        gap: 20px;
    }
    .page-sudoku .page {
        padding: 12px 8px;
    }
    .page-sudoku .page-print-inner {
        gap: 16px;
    }
    .page-sudoku .sudoku-howto {
        padding: 14px 12px;
    }
    .page-sudoku .breadcrumb {
        font-size: 0.8rem;
        word-break: break-word;
    }
}

@media print {
    .page-sudoku .sudoku-howto {
        display: none;
    }
}