/* ===== Light / Dark Mode Variables ===== */
.futoshiki-page-scope {
    --futo-bg: #ffffff;
    --futo-text: #475569;
    --futo-heading: #1e293b;
    --futo-border: #e2e8f0;
    --futo-card-bg: #f8fafc;
    --futo-cell-bg: #ffffff;
    --futo-cell-border: #94a3b8;
    --futo-operator-color: #3b82f6;
    --futo-faq-bg: #ffffff;
    --futo-faq-border: #e2e8f0;
    --futo-faq-title: #1e293b;
    --futo-faq-text: #475569;
    --futo-faq-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    --futo-sidebar-bg: #1e293b;
    --futo-sidebar-text: #cbd5e1;
    --futo-sidebar-heading: #ffffff;
}

.dark .futoshiki-page-scope {
    --futo-bg: #0f172a;
    --futo-text: #cbd5e1;
    --futo-heading: #f8fafc;
    --futo-border: #334155;
    --futo-card-bg: #1e293b;
    --futo-cell-bg: #1e293b;
    --futo-cell-border: #475569;
    --futo-operator-color: #60a5fa;
    --futo-faq-bg: #1e293b;
    --futo-faq-border: #334155;
    --futo-faq-title: #f8fafc;
    --futo-faq-text: #cbd5e1;
    --futo-faq-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --futo-sidebar-bg: #0f172a;
    --futo-sidebar-text: #94a3b8;
    --futo-sidebar-heading: #e2e8f0;
}

/* ===== Futoshiki Page Layout ===== */
.futoshiki-page-scope.futoshiki-layout {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 1rem;
    width: 100%;
}

@media (min-width: 769px) {
    .futoshiki-page-scope.futoshiki-layout {
        padding: 2rem 1.5rem;
    }
}

/* ===== Info Card Grid (now vertical flex) ===== */
.futoshiki-page-scope .futo-cards-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.futoshiki-page-scope .futo-info-card {
    background: var(--futo-card-bg);
    border: 1px solid var(--futo-border);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.futoshiki-page-scope .futo-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.futoshiki-page-scope .futo-info-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--futo-heading);
    margin: 0;
}

/* Numbered Badge */
.futoshiki-page-scope .futo-badge {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--futo-operator-color);
    color: #ffffff;
    font-weight: 800;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

/* ===== Content Column ===== */
.futoshiki-page-scope .futoshiki-content {
    min-width: 0;
}

.futoshiki-page-scope .futoshiki-content h1 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--futo-heading);
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.futoshiki-page-scope .futoshiki-content p {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--futo-text);
    margin-bottom: 1.25rem;
}

.futoshiki-page-scope .futoshiki-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--futo-heading);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

/* ===== 9x9 Game Grid (5x5 board + interstitial operators) ===== */
.futoshiki-page-scope #futoshiki-game-container {
    display: grid;
    /* Dynamic Scaling: cell (32-44px), operator (16-24px) */
    grid-template-columns: clamp(32px, 10vw, 44px) clamp(16px, 5vw, 24px) clamp(32px, 10vw, 44px) clamp(16px, 5vw, 24px) clamp(32px, 10vw, 44px) clamp(16px, 5vw, 24px) clamp(32px, 10vw, 44px) clamp(16px, 5vw, 24px) clamp(32px, 10vw, 44px);
    grid-template-rows: clamp(32px, 10vw, 44px) clamp(16px, 5vw, 24px) clamp(32px, 10vw, 44px) clamp(16px, 5vw, 24px) clamp(32px, 10vw, 44px) clamp(16px, 5vw, 24px) clamp(32px, 10vw, 44px) clamp(16px, 5vw, 24px) clamp(32px, 10vw, 44px);
    gap: 0;
    justify-content: center;
    margin: 2rem auto;
    max-width: fit-content;
    width: 100%;
}

@media (min-width: 768px) {
    .futoshiki-page-scope #futoshiki-game-container {
        /* Scale up: cell (60px), operator (30px) */
        grid-template-columns: 60px 30px 60px 30px 60px 30px 60px 30px 60px;
        grid-template-rows: 60px 30px 60px 30px 60px 30px 60px 30px 60px;
    }

    .futoshiki-page-scope .futo-cell {
        font-size: 1.8rem !important;
    }

    .futoshiki-page-scope .futo-op-h,
    .futoshiki-page-scope .futo-op-v {
        font-size: 1.4rem !important;
    }
}

/* Remove number input spinners */
.futoshiki-page-scope .futo-cell::-webkit-outer-spin-button,
.futoshiki-page-scope .futo-cell::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.futoshiki-page-scope .futo-cell[type=number] {
    -moz-appearance: textfield;
    appearance: textfield;
}

.futoshiki-page-scope .futo-cell {
    width: 100%;
    height: 100%;
    background: var(--futo-cell-bg);
    border: 1px solid #94a3b8;
    color: var(--futo-text);
    text-align: center;
    font-size: 1.25rem;
    font-weight: 500;
    outline: none;
    transition: all 0.2s;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.futoshiki-page-scope .futo-cell:hover,
.futoshiki-page-scope .futo-cell:focus {
    border-color: var(--futo-operator-color);
    outline: none;
}

.dark .futoshiki-page-scope .futo-cell {
    border-color: #334155;
}

.futoshiki-page-scope .futo-cell.selected {
    background: #bae6fd;
    border-color: #3b82f6;
}

.dark .futoshiki-page-scope .futo-cell.selected {
    background: #1e3a8a;
    border-color: #60a5fa;
}

.dark .futoshiki-page-scope .futo-op-h,
.dark .futoshiki-page-scope .futo-op-v {
    color: #ffffff;
    text-shadow: 0 0 4px rgba(255, 255, 255, 0.3);
}

/* Horizontal operator tracks */
.futoshiki-page-scope .futo-op-h {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--futo-operator-color);
    font-weight: 800;
    font-size: 1.5rem;
    pointer-events: none;
}

/* Vertical operator tracks */
.futoshiki-page-scope .futo-op-v {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--futo-operator-color);
    font-weight: 800;
    font-size: 1.5rem;
    pointer-events: none;
}

/* Intersection spacer cells (between operator rows and operator columns) */
.futoshiki-page-scope .futo-spacer {
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* ===== AdSense CLS-safe placeholder ===== */
.futoshiki-page-scope .ad-placeholder-cls {
    width: 100%;
    min-height: 250px;
    background: transparent;
    visibility: hidden;
    overflow: hidden;
    margin: 1.5rem 0;
}

.futoshiki-page-scope .ad-placeholder-cls.sidebar-ad {
    min-width: 300px;
    max-width: 300px;
    min-height: 600px;
    margin: 0 auto;
    background-color: var(--futo-card-bg);
    opacity: 0.8;
    visibility: visible;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 1.5rem;
    gap: 1.5rem;
}

/* ===== Sidebar ===== */
.futoshiki-page-scope .futoshiki-sidebar {
    min-width: 0;
}

.futoshiki-page-scope .next-puzzle-card {
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    padding: 2rem 1.5rem;
    text-align: center;
    border: 1px solid #334155;
    margin-top: 1.5rem;
}

.futoshiki-page-scope .next-puzzle-card h3 {
    font-size: 1.375rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 0.75rem;
    line-height: 1.2;
}

.futoshiki-page-scope .next-puzzle-card p {
    color: #94a3b8;
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.futoshiki-page-scope .next-puzzle-card .cta-btn {
    display: inline-block;
    width: 100%;
    background: #3b82f6;
    color: #ffffff;
    font-weight: 700;
    padding: 14px 24px;
    border-radius: 10px;
    text-decoration: none;
    font-size: 1rem;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
    transition: all 0.2s;
}

.futoshiki-page-scope .next-puzzle-card .cta-btn:hover {
    background: #2563eb;
    transform: translateY(-2px);
}

/* ===== FAQ Section ===== */
.futoshiki-page-scope .futoshiki-faq details {
    background: var(--futo-faq-bg);
    border: 1px solid var(--futo-faq-border);
    color: var(--futo-faq-text);
    border-radius: 12px;
    margin-bottom: 12px;
    box-shadow: var(--futo-faq-shadow);
    transition: all 0.2s ease-in-out;
}

.futoshiki-page-scope .futoshiki-faq details:hover {
    transform: translateY(-2px);
}

.futoshiki-page-scope .futoshiki-faq summary {
    padding: 20px;
    font-weight: 700;
    color: var(--futo-faq-title);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
    list-style: none;
}

.futoshiki-page-scope .futoshiki-faq summary::-webkit-details-marker {
    display: none;
}

.futoshiki-page-scope .futoshiki-faq .faq-content {
    padding: 0 20px 20px 20px;
    font-size: 15px;
    line-height: 1.6;
    opacity: 0.9;
}

/* ===== Conflict / Error State ===== */
.futoshiki-page-scope .futo-cell.conflict {
    background-color: #fecaca !important;
    border-color: #dc2626 !important;
    color: #dc2626 !important;
}

.dark .futoshiki-page-scope .futo-cell.conflict {
    background-color: #7f1d1d !important;
    border-color: #f87171 !important;
    color: #f87171 !important;
}

/* Given cells styling */
.futoshiki-page-scope .futo-cell.given {
    background-color: var(--futo-card-bg);
    font-weight: 800;
    color: var(--futo-heading);
}

/* ===== Win-State Success Banner ===== */
.futoshiki-page-scope .futo-success {
    text-align: center;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 12px;
    font-size: 1.5rem;
    font-weight: 800;
    background: #dcfce7;
    color: #166534;
    border: 2px solid #22c55e;
    animation: futoSuccessPulse 0.6s ease-in-out;
}

.dark .futoshiki-page-scope .futo-success {
    background: #14532d;
    color: #86efac;
    border-color: #22c55e;
}

@keyframes futoSuccessPulse {
    0% {
        transform: scale(0.95);
        opacity: 0;
    }

    60% {
        transform: scale(1.02);
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.futoshiki-page-scope .futo-promo-card {
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 1rem;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    margin: 0 auto;
}

.dark .futoshiki-page-scope .futo-promo-card {
    background-color: #161f30;
    border-color: #334155;
    box-shadow: none;
}

/* ===== Layout Enforcement ===== */
@media (min-width: 1024px) {
    .futoshiki-page-scope .futoshiki-content {
        flex: 0 0 65% !important;
        max-width: 65% !important;
    }

    .futoshiki-page-scope .futoshiki-sidebar {
        flex: 0 0 35% !important;
        max-width: 35% !important;
    }
}