:root {
    --sj-primary: #0f766e;
    --sj-primary-hover: #0b5f59;
    --sj-focus: #0ea5e9;
    --sj-text: #1f2933;
    --sj-muted: #5f6b7a;
    --sj-border: #d7dde5;
    --sj-surface: #ffffff;
    --sj-surface-muted: #f6f8fb;
    --sj-grid-border: #000;
    --sj-grid-line: #a5afbb;
    --sj-hl: #c05621;
    --sj-hl-peer: rgba(234, 88, 12, 0.14);
    --sj-hl-dig: rgba(249, 115, 22, 0.24);
    --sj-hl-peer-dig: rgba(245, 158, 11, 0.32);
    --sj-grid-warning: #fff3cd;
    --sj-grid-error: #f8d7da;
}

html, body {
    color: var(--sj-text);
    font-family: var(--bs-font-sans-serif);
    background-color: var(--sj-surface);
}

a, .btn-link {
    color: #0b67a3;
}

.btn-primary {
    color: #fff;
    background-color: var(--sj-primary);
    border-color: var(--sj-primary);
}

.btn-primary:hover, .btn-primary:active, .btn-primary:first-child:active {
    color: #fff;
    background-color: var(--sj-primary-hover);
    border-color: var(--sj-primary-hover);
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem var(--sj-focus);
}

.content {
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.content > h1:first-child,
.content > article > h1:first-child {
    margin-bottom: 0.75rem;
}

h1 {
    font-size: 2rem;
    font-weight: 650;
    letter-spacing: 0;
    text-align: center;
}

h2, h3 {
    margin-top: 2rem;
    letter-spacing: 0;
}

@media (max-width: 640.98px) {
    h1 {
        font-size: 1.75rem;
    }
}

h1:focus {
    outline: none;
}

.valid.modified:not([type=checkbox]) {
    outline: 1px solid #26b050;
}

.invalid {
    outline: 1px solid #e50000;
}

.validation-message {
    color: #e50000;
}

.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNTYiIGhlaWdodD0iNDkiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeG1sbnM6eGxpbms9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkveGxpbmsiIG92ZXJmbG93PSJoaWRkZW4iPjxkZWZzPjxjbGlwUGF0aCBpZD0iY2xpcDAiPjxyZWN0IHg9IjIzNSIgeT0iNTEiIHdpZHRoPSI1NiIgaGVpZ2h0PSI0OSIvPjwvY2xpcFBhdGg+PC9kZWZzPjxnIGNsaXAtcGF0aD0idXJsKCNjbGlwMCkiIHRyYW5zZm9ybT0idHJhbnNsYXRlKC0yMzUgLTUxKSI+PHBhdGggZD0iTTI2My41MDYgNTFDMjY0LjcxNyA1MSAyNjUuODEzIDUxLjQ4MzcgMjY2LjYwNiA1Mi4yNjU4TDI2Ny4wNTIgNTIuNzk4NyAyNjcuNTM5IDUzLjYyODMgMjkwLjE4NSA5Mi4xODMxIDI5MC41NDUgOTIuNzk1IDI5MC42NTYgOTIuOTk2QzI5MC44NzcgOTMuNTEzIDI5MSA5NC4wODE1IDI5MSA5NC42NzgyIDI5MSA5Ny4wNjUxIDI4OS4wMzggOTkgMjg2LjYxNyA5OUwyNDAuMzgzIDk5QzIzNy45NjMgOTkgMjM2IDk3LjA2NTEgMjM2IDk0LjY3ODIgMjM2IDk0LjM3OTkgMjM2LjAzMSA5NC4wODg2IDIzNi4wODkgOTMuODA3MkwyMzYuMzM4IDkzLjAxNjIgMjM2Ljg1OCA5Mi4xMzE0IDI1OS40NzMgNTMuNjI5NCAyNTkuOTYxIDUyLjc5ODUgMjYwLjQwNyA1Mi4yNjU4QzI2MS4yIDUxLjQ4MzcgMjYyLjI5NiA1MSAyNjMuNTA2IDUxWk0yNjMuNTg2IDY2LjAxODNDMjYwLjczNyA2Ni4wMTgzIDI1OS4zMTMgNjcuMTI0NSAyNTkuMzEzIDY5LjMzNyAyNTkuMzEzIDY5LjYxMDIgMjU5LjMzMiA2OS44NjA4IDI1OS4zNzEgNzAuMDg4N0wyNjEuNzk1IDg0LjAxNjEgMjY1LjM4IDg0LjAxNjEgMjY3LjgyMSA2OS43NDc1QzI2Ny44NiA2OS43MzA5IDI2Ny44NzkgNjkuNTg3NyAyNjcuODc5IDY5LjMxNzkgMjY3Ljg3OSA2Ny4xMTgyIDI2Ni40NDggNjYuMDE4MyAyNjMuNTg2IDY2LjAxODNaTTI2My41NzYgODYuMDU0N0MyNjEuMDQ5IDg2LjA1NDcgMjU5Ljc4NiA4Ny4zMDA1IDI1OS43ODYgODkuNzkyMSAyNTkuNzg2IDkyLjI4MzcgMjYxLjA0OSA5My41Mjk1IDI2My41NzYgOTMuNTI5NSAyNjYuMTE2IDkzLjUyOTUgMjY3LjM4NyA5Mi4yODM3IDI2Ny4zODcgODkuNzkyMSAyNjcuMzg3IDg3LjMwMDUgMjY2LjExNiA4Ni4wNTQ3IDI2My41NzYgODYuMDU0N1oiIGZpbGw9IiNGRkU1MDAiIGZpbGwtcnVsZT0iZXZlbm9kZCIvPjwvZz48L3N2Zz4=) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
}

.blazor-error-boundary::after {
    content: "An error has occurred.";
}

.darker-border-checkbox.form-check-input {
    border-color: #929292;
}

.form-floating > .form-control-plaintext::placeholder,
.form-floating > .form-control::placeholder {
    color: var(--bs-secondary-color);
    text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder,
.form-floating > .form-control:focus::placeholder {
    text-align: start;
}

.sudokugrid {
    margin-top: 1rem;
    text-align: center;
    width: 100%;
}

.sudoku-board-scroll {
    max-width: 100%;
    overflow-x: auto;
    padding: 0.125rem 0 0.5rem;
    -webkit-overflow-scrolling: touch;
}

.sudoku-grid {
    background-color: #fff;
    border: 2px solid var(--sj-grid-border);
    box-sizing: border-box;
    display: grid;
    grid-template-columns: repeat(var(--sudoku-cols), minmax(0, 1fr));
    grid-template-rows: repeat(var(--sudoku-cols), minmax(0, 1fr));
    aspect-ratio: 1;
    margin: 0 auto;
    width: min(100%, var(--sudoku-width));
    text-align: center;
}

.factor_2 .sudoku-grid {
    --sudoku-cols: 4;
    --sudoku-width: 368px;
}

.factor_3 .sudoku-grid {
    --sudoku-cols: 9;
    --sudoku-width: 450px;
}

.factor_4 .sudoku-grid {
    --sudoku-cols: 16;
    --sudoku-width: 560px;
}

.sudoku-grid > .cell {
    align-items: stretch;
    border-bottom: 1px solid var(--sj-grid-line);
    border-right: 1px solid var(--sj-grid-line);
    box-sizing: border-box;
    display: flex;
    justify-content: stretch;
    overflow: hidden;
}

.factor_2 .sudoku-grid > .cell:nth-child(4n) {
    border-right-width: 0;
}

.factor_2 .sudoku-grid > .cell:nth-last-child(-n + 4) {
    border-bottom-width: 0;
}

.factor_2 .sudoku-grid > .cell:nth-child(4n + 2) {
    border-right: 2px solid var(--sj-grid-border);
}

.factor_2 .sudoku-grid > .cell:nth-child(n + 5):nth-child(-n + 8) {
    border-bottom: 2px solid var(--sj-grid-border);
}

.factor_3 .sudoku-grid > .cell:nth-child(9n) {
    border-right-width: 0;
}

.factor_3 .sudoku-grid > .cell:nth-last-child(-n + 9) {
    border-bottom-width: 0;
}

.factor_3 .sudoku-grid > .cell:nth-child(9n + 3),
.factor_3 .sudoku-grid > .cell:nth-child(9n + 6) {
    border-right: 2px solid var(--sj-grid-border);
}

.factor_3 .sudoku-grid > .cell:nth-child(n + 19):nth-child(-n + 27),
.factor_3 .sudoku-grid > .cell:nth-child(n + 46):nth-child(-n + 54) {
    border-bottom: 2px solid var(--sj-grid-border);
}

.factor_4 .sudoku-grid > .cell:nth-child(16n) {
    border-right-width: 0;
}

.factor_4 .sudoku-grid > .cell:nth-last-child(-n + 16) {
    border-bottom-width: 0;
}

.factor_4 .sudoku-grid > .cell:nth-child(16n + 4),
.factor_4 .sudoku-grid > .cell:nth-child(16n + 8),
.factor_4 .sudoku-grid > .cell:nth-child(16n + 12) {
    border-right: 2px solid var(--sj-grid-border);
}

.factor_4 .sudoku-grid > .cell:nth-child(n + 49):nth-child(-n + 64),
.factor_4 .sudoku-grid > .cell:nth-child(n + 113):nth-child(-n + 128),
.factor_4 .sudoku-grid > .cell:nth-child(n + 177):nth-child(-n + 192) {
    border-bottom: 2px solid var(--sj-grid-border);
}

.sudokugrid .cell.w {
    background-color: var(--sj-grid-warning);
    box-shadow: inset 0 0 0 2px #d39e00;
}

.sudokugrid .cell.e {
    background-color: var(--sj-grid-error);
    box-shadow: inset 0 0 0 2px #dc3545;
}

.sudokugrid .sl {
    background-color: transparent;
    border: none;
    box-sizing: border-box;
    color: #000;
    font: inherit;
    font-style: normal;
    font-weight: bolder;
    line-height: 1;
    margin: 0;
    padding: 0;
    text-align: center;
    width: 100%;
    height: 100%;
}

.sudokugrid button.sl {
    align-items: center;
    appearance: none;
    cursor: pointer;
    display: flex;
    justify-content: center;
}

.sudokugrid input.sl {
    display: block;
}

.sudokugrid .sl:focus {
    outline: none;
    box-shadow: inset 0 0 0 3px var(--sj-focus);
}

.sudokugrid .sl.given-value {
    background-color: #d1d5db;
    color: #000;
    cursor: default;
}

.sudokugrid input.v {
    color: #999;
    font-style: italic;
    font-weight: normal;
}

.sudokugrid .options {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 1rem;
}

.sudokugrid .options input {
    margin-left: 5px;
    margin-right: 5px;
}

.factor_2 .sl {
    font-size: 2.75rem;
}

.factor_3 .sl {
    font-size: 1.5rem;
}

.factor_4 .sl {
    font-size: 1.125rem;
}

@media (max-width: 640.98px) {
    .factor_2 .sudoku-grid {
        --sudoku-width: 312px;
    }

    .factor_2 .sl {
        font-size: clamp(1.25rem, 8vw, 2rem);
    }

    .factor_3 .sudoku-grid {
        --sudoku-width: 100%;
    }

    .factor_3 .sl {
        font-size: clamp(1rem, 5.2vw, 1.35rem);
    }

    .factor_4 .sudoku-grid {
        --sudoku-width: 100%;
    }

    .factor_4 .sl {
        font-size: clamp(0.65rem, 2.9vw, 0.95rem);
    }

    .options {
        align-items: stretch;
        flex-direction: column;
    }

    .options .btn {
        width: 100%;
    }

    .factor_4 .digit-pad {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        width: 100%;
    }

    .factor_4 .digit-pad-btn {
        min-width: 0;
        width: 100%;
    }
}

.info.notice {
    background-color: #fff6bf;
    border: 1px solid #ffd324;
    color: #514721;
}

.wrapper {
    margin: 0 auto;
    max-width: 800px;
    padding: 1rem 0 2rem;
}

.wrapper p,
.wrapper li {
    line-height: 1.65;
}

.puzzle-timer {
    align-items: center;
    background: linear-gradient(120deg, #e7f5ff, #f4fbf8);
    border: 1px solid #bfdff1;
    border-radius: 10px;
    color: #134e4a;
    gap: 0.5rem;
    margin: 0;
    min-height: calc(1.5em + 0.75rem + 2px);
    padding: 0.375rem 0.75rem;
}

.puzzle-timer .label {
    color: #0f766e;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.puzzle-timer strong {
    color: #0b3d3a;
    font-size: 0.95rem;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.04em;
}

.sudokugrid .options .options-timer {
    margin-right: 0.25rem;
}

.puzzle-timer[data-running="true"] {
    box-shadow: inset 0 0 0 1px #7ac9d3;
}

/* Reviews page */
.reviews-container {
    max-width: 900px;
    margin: 0 auto;
}

.review-item {
    border: 1px solid var(--sj-border);
    border-radius: 8px;
    margin-bottom: 1rem;
    padding: 1rem;
}

.review-item h2 {
    font-size: 1.35rem;
    margin-bottom: 0.5rem;
}

.review-item h2 a {
    text-decoration: none;
}

.review-item h2 a:hover {
    text-decoration: underline;
}

.review-standfirst {
    color: #555;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.review-item hr {
    display: none;
    margin-top: 1.5rem;
    border: none;
    border-top: 1px solid #ddd;
}

.read-more {
    font-weight: 500;
}

.review-meta {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin: 1rem 0 2rem;
    padding: 1rem;
    background-color: #f6f8fb;
    border: 1px solid #d7dde5;
    border-radius: 8px;
}

.review-meta > div {
    display: grid;
    gap: 0.125rem;
}

.review-meta-label {
    color: #5f6b7a;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
}

.review-intro,
.review-section {
    margin-bottom: 2rem;
}

.review-section h2,
.review-intro h2,
.review-conclusion h2 {
    border-bottom: 1px solid #d7dde5;
    color: #1f2933;
    font-size: 1.35rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
}

.cognitive-areas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.area-card {
    background-color: #f8f9fa;
    border: 1px solid #d7dde5;
    border-left: 4px solid #0f766e;
    border-radius: 8px;
    padding: 1rem;
}

.area-card h3 {
    color: #1f2933;
    font-size: 1.1rem;
    margin-top: 0;
}

.area-card p {
    color: #5f6b7a;
    font-size: 0.95rem;
    margin: 0.5rem 0 0;
}

.pros-list,
.cons-list {
    padding-left: 1.25rem;
}

.pros-list li::marker {
    color: #198754;
}

.cons-list li::marker {
    color: #dc3545;
}

.review-conclusion {
    background-color: #eef8f6;
    border: 1px solid #bfddd8;
    border-radius: 8px;
    margin: 2rem 0;
    padding: 1.5rem;
}

.review-conclusion h2 {
    margin-top: 0rem;
}
.review-cta {
    border-top: 1px solid #d7dde5;
    margin-top: 2rem;
    padding-top: 2rem;
    text-align: center;
}

.review-cta p {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

@media (max-width: 640.98px) {
    .review-meta {
        display: grid;
    }

    .cognitive-areas {
        grid-template-columns: 1fr;
    }

    .review-cta p {
        display: grid;
    }
}

/* Puzzle nav */
.puzzle-nav {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #dee2e6;
}

.puzzle-nav ul li {
    margin-bottom: 0.5rem;
}

.puzzle-nav a {
    text-decoration: none;
    color: #0d6efd;
}

.puzzle-nav a:hover {
    text-decoration: underline;
}

.puzzle9x9-form .sudoku-board-scroll {
    overflow-x: auto;
    padding-bottom: 0.5rem;
}