:root {
    --mini6-bg: #fffdf0;
    --mini6-paper: #fcfcfc;
    --mini6-panel: #f4efe0;
    --mini6-ink: #151415;
    --mini6-accent: #3972e1;
    --mini6-accent-soft: #d8e9ff;
    --mini6-success: #6fcd78;
    --mini6-warning: #ffcc66;
    --mini6-danger: #ff8e8e;
    --mini6-shadow: 6px 6px 0 #151415;
    --mini6-radius: 20px;
    --mini6-gap: 16px;
}

body.sudoku6x6-page {
    background: var(--mini6-bg);
    color: var(--mini6-ink);
}

.sudoku6x6-shell {
    width: min(1200px, calc(100% - 32px));
    margin: 0 auto;
    padding: 32px 0 56px;
}

.sudoku6x6-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
    gap: 24px;
    align-items: stretch;
    margin-bottom: 28px;
}

.sudoku6x6-card {
    background: var(--mini6-paper);
    border: 4px solid var(--mini6-ink);
    border-radius: var(--mini6-radius);
    box-shadow: var(--mini6-shadow);
}

.sudoku6x6-intro,
.sudoku6x6-sidecard {
    padding: 24px;
}

.sudoku6x6-eyebrow {
    display: inline-flex;
    margin: 0 0 14px;
    padding: 6px 12px;
    border: 3px solid var(--mini6-ink);
    border-radius: 999px;
    background: #ffef99;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.sudoku6x6-title {
    margin: 0 0 12px;
    font-size: clamp(2rem, 4vw, 3.4rem);
    line-height: 1;
}

.sudoku6x6-lead {
    margin: 0 0 16px;
    font-size: 1.05rem;
    line-height: 1.6;
    max-width: 58ch;
}

.sudoku6x6-feature-list,
.sudoku6x6-tip-list {
    margin: 0;
    padding-left: 20px;
    line-height: 1.7;
}

.sudoku6x6-tip-list li + li,
.sudoku6x6-feature-list li + li {
    margin-top: 8px;
}

.sudoku6x6-sidecard h2,
.sudoku6x6-section h2 {
    margin: 0 0 12px;
    font-size: 1.45rem;
}

.sudoku6x6-sidecard p,
.sudoku6x6-section p {
    margin: 0 0 14px;
    line-height: 1.6;
}

.sudoku6x6-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
    gap: 28px;
    align-items: start;
}

.sudoku6x6-game {
    padding: 24px;
}

.sudoku6x6-toolbar {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 18px;
}

.sudoku6x6-field {
    display: grid;
    gap: 8px;
}

.sudoku6x6-field label {
    font-weight: 700;
}

.sudoku6x6-select {
    width: 100%;
    min-height: 46px;
    padding: 10px 12px;
    border: 3px solid var(--mini6-ink);
    border-radius: 14px;
    background: #fff;
    color: var(--mini6-ink);
    font: inherit;
    font-weight: 700;
}

.sudoku6x6-status {
    display: none;
}

.sudoku6x6-status[data-tone="success"] {
    background: #dff8df;
}

.sudoku6x6-status[data-tone="warning"] {
    background: #fff0bf;
}

.sudoku6x6-status[data-tone="info"] {
    background: var(--mini6-accent-soft);
}

.sudoku6x6-board-wrap {
    display: flex;
    justify-content: center;
    margin-bottom: 18px;
}

.sudoku6x6-board {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 64px));
    gap: 0;
    border: 4px solid var(--mini6-ink);
    border-radius: 22px;
    overflow: hidden;
    background: var(--mini6-paper);
    box-shadow: var(--mini6-shadow);
}

.sudoku6x6__cell {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 64px;
    padding: 8px;
    border: 0;
    border-right: 3px solid var(--mini6-ink);
    border-bottom: 3px solid var(--mini6-ink);
    background: #fff;
    color: var(--mini6-ink);
    cursor: pointer;
    transition: transform 0.12s ease, background-color 0.12s ease;
}

.sudoku6x6__cell:nth-child(6n) {
    border-right: 0;
}

.sudoku6x6__cell:nth-last-child(-n + 6) {
    border-bottom: 0;
}

.sudoku6x6__cell:nth-child(n + 7):nth-child(-n + 12),
.sudoku6x6__cell:nth-child(n + 19):nth-child(-n + 24) {
    border-bottom-width: 4px;
}

.sudoku6x6__cell:nth-child(6n + 3) {
    border-right-width: 4px;
}

.sudoku6x6__cell:hover {
    transform: translate(-1px, -1px);
}

.sudoku6x6__cell.is-selected {
    background: #c6dafc;
}

.sudoku6x6__cell.is-highlighted {
    background: #fff0bf;
    background-image: none;
}

.sudoku6x6__cell.is-target {
    background: #ffd43b;
    background-image: none;
    box-shadow: inset 0 0 0 3px var(--mini6-ink);
}

.sudoku6x6__cell.is-given:not(.is-highlighted):not(.is-target) {
    background: #eff3fc;
}

.sudoku6x6__cell.is-empty:not(.is-highlighted):not(.is-target) {
    background-image: linear-gradient(135deg, rgba(21, 20, 21, 0.05), rgba(21, 20, 21, 0));
}

.sudoku6x6__cell-content {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 36px;
    font-size: 1.7rem;
    font-weight: 800;
    line-height: 1;
}

.sudoku6x6__cell-content[data-render-mode="image"] {
    min-height: 44px;
}

.sudoku6x6__cell-image {
    display: block;
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.sudoku6x6__cell-placeholder {
    display: inline-block;
    width: 1rem;
    min-height: 1rem;
}

.sudoku6x6-actions,
.sudoku6x6-palette {
    display: grid;
    gap: 10px;
}

.sudoku6x6-actions {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    margin-bottom: 16px;
}

.sudoku6x6-palette {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    margin-bottom: 18px;
}

.sudoku6x6__palette-symbol {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 36px;
    line-height: 1;
}

.sudoku6x6__palette-symbol img {
    display: block;
    width: 32px;
    height: 32px;
    margin: 0 auto;
    object-fit: contain;
}

.sudoku6x6-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 10px 12px;
    border: 3px solid var(--mini6-ink);
    border-radius: 14px;
    background: #fff;
    color: var(--mini6-ink);
    font: inherit;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 3px 3px 0 var(--mini6-ink);
    transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease;
}

.sudoku6x6-button--icon {
    padding: 6px;
}

.sudoku6x6__erase-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
}

.sudoku6x6__erase-icon svg {
    display: block;
    width: 24px;
    height: 24px;
}

.sudoku6x6-button:hover:not(:disabled) {
    transform: translate(-1px, -1px);
    box-shadow: 4px 4px 0 var(--mini6-ink);
}

.sudoku6x6-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    box-shadow: none;
}

.sudoku6x6-button--primary {
    background: #a8d8ff;
}

.sudoku6x6-button--accent {
    background: #ffe28a;
}

.sudoku6x6-button--success {
    background: #cdf0d0;
}

.sudoku6x6-hint {
    padding: 18px;
    border: 3px dashed var(--mini6-ink);
    border-radius: 18px;
    background: #fffef8;
}

.sudoku6x6-hint h2 {
    margin: 0 0 10px;
    font-size: 1.2rem;
}

.sudoku6x6-hint p {
    margin: 0;
    line-height: 1.6;
}

.sudoku6x6-sidebar {
    display: grid;
    gap: 20px;
}

.sudoku6x6-section {
    padding: 24px;
}

.sudoku6x6-section a {
    color: var(--mini6-accent);
    font-weight: 700;
}

@media (max-width: 1080px) {
    .sudoku6x6-hero,
    .sudoku6x6-layout {
        grid-template-columns: 1fr;
    }

    .sudoku6x6-sidecard {
        order: -1;
    }
}

@media (max-width: 780px) {
    .sudoku6x6-shell {
        width: min(100% - 20px, 1200px);
        padding-top: 20px;
    }

    .sudoku6x6-intro,
    .sudoku6x6-sidecard,
    .sudoku6x6-game,
    .sudoku6x6-section {
        padding: 18px;
    }

    .sudoku6x6-toolbar {
        grid-template-columns: 1fr;
    }

    .sudoku6x6-board {
        grid-template-columns: repeat(6, minmax(0, 54px));
    }

    .sudoku6x6__cell {
        min-height: 54px;
        padding: 7px;
    }

    .sudoku6x6__cell-content {
        font-size: 1.45rem;
    }

    .sudoku6x6__cell-image {
        width: 34px;
        height: 34px;
    }

    .sudoku6x6-actions {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .sudoku6x6-palette {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .sudoku6x6-button {
        min-height: 44px;
        padding: 9px 10px;
    }
}

@media (max-width: 560px) {
    .sudoku6x6-title {
        font-size: 1.9rem;
    }

    .sudoku6x6-board {
        width: 100%;
        grid-template-columns: repeat(6, minmax(0, 1fr));
    }

    .sudoku6x6__cell {
        min-height: 46px;
        padding: 6px;
    }

    .sudoku6x6__cell-content {
        font-size: 1.2rem;
    }

    .sudoku6x6__cell-content[data-render-mode="image"] {
        min-height: 32px;
    }

    .sudoku6x6__cell-image {
        width: 28px;
        height: 28px;
    }

    .sudoku6x6-actions,
    .sudoku6x6-palette {
        gap: 8px;
    }

    .sudoku6x6-button {
        min-height: 40px;
        padding: 8px 9px;
        border-radius: 12px;
    }

    .sudoku6x6__palette-symbol img {
        width: 24px;
        height: 24px;
    }
}

@media (max-width: 420px) {
    .sudoku6x6-board {
        border-radius: 18px;
    }

    .sudoku6x6__cell {
        min-height: 40px;
        padding: 5px;
    }

    .sudoku6x6__cell-content {
        font-size: 1rem;
    }

    .sudoku6x6__cell-image {
        width: 22px;
        height: 22px;
    }

    .sudoku6x6-palette {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .sudoku6x6-button {
        min-height: 38px;
        padding: 7px 8px;
        font-size: 0.92rem;
    }

    .sudoku6x6__erase-icon,
    .sudoku6x6__erase-icon svg {
        width: 20px;
        height: 20px;
    }
}