[data-bs-theme="light"] {
    --ts-body-bg: #f4f6f9;
    --ts-card-bg: #ffffff;
    --ts-stat-bg: #ffffff;
    --ts-stat-border: rgba(0, 0, 0, 0.06);
    --ts-stat-value: #212529;
    --ts-stat-label: #6c757d;
    --ts-accent-primary: #0d6efd;
    --ts-accent-success: #198754;
    --ts-accent-danger: #dc3545;
    --ts-accent-warning: #fd7e14;
    --ts-faq-bg: #ffffff;
    --ts-cell-bg: #ffffff;
    --ts-cell-border: rgba(0, 0, 0, 0.12);
    --ts-cell-text: #212529;
    --ts-cell-found-bg: rgba(25, 135, 84, 0.12);
    --ts-cell-found-border: rgba(25, 135, 84, 0.4);
    --ts-cell-found-text: rgba(33, 37, 41, 0.45);
    --ts-topbar-bg: #ffffff;
    --ts-topbar-border: rgba(0, 0, 0, 0.06);
    color-scheme: light;
}

[data-bs-theme="dark"] {
    --ts-body-bg: #0d1117;
    --ts-card-bg: #161b22;
    --ts-stat-bg: #161b22;
    --ts-stat-border: rgba(255, 255, 255, 0.08);
    --ts-stat-value: #e6edf3;
    --ts-stat-label: #8b949e;
    --ts-accent-primary: #58a6ff;
    --ts-accent-success: #3fb950;
    --ts-accent-danger: #f85149;
    --ts-accent-warning: #d29922;
    --ts-faq-bg: #161b22;
    --ts-cell-bg: #1c2128;
    --ts-cell-border: rgba(255, 255, 255, 0.1);
    --ts-cell-text: #e6edf3;
    --ts-cell-found-bg: rgba(63, 185, 80, 0.12);
    --ts-cell-found-border: rgba(63, 185, 80, 0.35);
    --ts-cell-found-text: rgba(230, 237, 243, 0.35);
    --ts-topbar-bg: #1c2128;
    --ts-topbar-border: rgba(255, 255, 255, 0.06);
    color-scheme: dark;
}

body {
    background-color: var(--ts-body-bg);
    min-height: 100vh;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    transition: background-color 0.2s ease, color 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.container-schulte {
    max-width: 1100px;
}

.schulte-title {
    font-size: clamp(1.35rem, 4.5vw, 1.85rem);
    font-weight: 700;
    line-height: 1.2;
}

.schulte-subtitle {
    font-size: clamp(0.85rem, 2.8vw, 1rem);
    line-height: 1.4;
}

.seo-intro {
    max-width: 640px;
}

.section-label {
    letter-spacing: 0.08em;
    font-size: 0.7rem;
    font-weight: 600;
}

.card {
    border: none;
    transition: background-color 0.2s ease;
}

[data-bs-theme="dark"] .card {
    background-color: var(--ts-card-bg);
}

#theme-toggle {
    min-width: 7.5rem;
}

.seo-intro strong {
    font-weight: 600;
}

/* Mode toggle */
.mode-toggle {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.mode-btn {
    background: var(--ts-stat-bg);
    border: 1px solid var(--ts-stat-border);
    color: var(--ts-stat-label);
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: 0.5rem;
    padding: 0.55rem 0.25rem;
    min-height: 2.75rem;
    transition: all 0.15s ease;
}

.mode-btn:hover {
    border-color: var(--ts-accent-primary);
    color: var(--ts-accent-primary);
}

.mode-btn.active {
    background: var(--ts-accent-primary);
    border-color: var(--ts-accent-primary);
    color: #fff;
}

/* Size selector */
.size-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.45rem;
}

.size-btn {
    background: var(--ts-stat-bg);
    border: 1px solid var(--ts-stat-border);
    color: var(--ts-stat-label);
    font-weight: 600;
    font-size: 0.85rem;
    border-radius: 0.5rem;
    padding: 0.5rem 0.2rem;
    min-height: 2.6rem;
    transition: all 0.15s ease;
}

.size-btn:hover {
    border-color: var(--ts-accent-primary);
    color: var(--ts-accent-primary);
}

.size-btn.active {
    background: var(--ts-accent-primary);
    border-color: var(--ts-accent-primary);
    color: #fff;
}

/* Mini stats */
.mini-stat {
    background: var(--ts-stat-bg);
    border: 1px solid var(--ts-stat-border);
    border-radius: 0.6rem;
    padding: 0.75rem 0.5rem;
    text-align: center;
}

.mini-stat__value {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--ts-stat-value);
    margin: 0 0 0.15rem;
}

.mini-stat__label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ts-stat-label);
    margin: 0;
}

/* Stage */
.schulte-stage {
    overflow: hidden;
}

.schulte-stage > .card-body {
    padding: 1.25rem;
}

.stage-topbar {
    display: flex;
    justify-content: space-around;
    align-items: stretch;
    gap: 0.35rem;
    width: 100%;
    max-width: 480px;
    background: var(--ts-topbar-bg);
    border: 1px solid var(--ts-topbar-border);
    border-radius: 0.75rem;
    padding: 0.75rem 0.85rem;
}

.stage-topbar__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    flex: 1;
    min-width: 0;
}

.stage-topbar__label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--ts-stat-label);
}

.stage-topbar__value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ts-stat-value);
    line-height: 1.1;
}

.stage-topbar__value--mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-variant-numeric: tabular-nums;
}

.stage-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.6rem;
    max-width: 480px;
}

.stage-actions .btn {
    min-height: 2.85rem;
    font-weight: 600;
}

.stage-actions .btn.d-none + .btn {
    grid-column: 1 / -1;
}

#stage-hint {
    max-width: 480px;
    line-height: 1.45;
}

/* Grid */
.schulte-grid {
    --grid-size: 5;
    display: grid;
    grid-template-columns: repeat(var(--grid-size), minmax(0, 1fr));
    gap: clamp(3px, 1.1vw, 8px);
    width: 100%;
    max-width: min(480px, 100%);
    aspect-ratio: 1 / 1;
    position: relative;
}

.schulte-grid.has-center-point::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: clamp(8px, 2.2vw, 10px);
    height: clamp(8px, 2.2vw, 10px);
    margin: calc(clamp(8px, 2.2vw, 10px) / -2) 0 0 calc(clamp(8px, 2.2vw, 10px) / -2);
    background: var(--ts-accent-danger);
    border-radius: 50%;
    z-index: 2;
    pointer-events: none;
    box-shadow: 0 0 0 4px rgba(220, 53, 69, 0.15);
}

.schulte-cell {
    background: var(--ts-cell-bg);
    border: 1px solid var(--ts-cell-border);
    border-radius: clamp(0.2rem, 1.2vw, 0.4rem);
    color: var(--ts-cell-text);
    font-weight: 700;
    font-size: clamp(0.7rem, calc(28vw / var(--grid-size)), 1.4rem);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    user-select: none;
    touch-action: manipulation;
    -webkit-user-select: none;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
}

.schulte-cell:hover:not(.is-found) {
    border-color: var(--ts-accent-primary);
    color: var(--ts-accent-primary);
}

.schulte-cell:active:not(.is-found) {
    transform: scale(0.96);
}

.schulte-cell.is-found {
    background: var(--ts-cell-found-bg);
    border-color: var(--ts-cell-found-border);
    color: var(--ts-cell-found-text);
    cursor: default;
}

.schulte-cell.is-wrong {
    background: rgba(220, 53, 69, 0.18) !important;
    border-color: var(--ts-accent-danger) !important;
    color: var(--ts-accent-danger) !important;
    transform: scale(0.94);
}

.schulte-grid.is-mental .schulte-cell {
    cursor: default;
    pointer-events: none;
}

.schulte-grid.is-mental .schulte-cell:hover {
    border-color: var(--ts-cell-border);
    color: var(--ts-cell-text);
}

/* Result panel */
.schulte-result {
    max-width: 480px;
}

.schulte-result__inner {
    background: var(--ts-stat-bg);
    border: 1px solid var(--ts-accent-success);
    border-radius: 0.75rem;
    padding: 1.25rem 1rem;
}

.schulte-result__badge {
    color: var(--ts-accent-success);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    min-height: 1.1rem;
}

.schulte-result__stat-value {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--ts-stat-value);
    margin: 0;
}

.schulte-result__stat-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ts-stat-label);
    margin: 0;
}

.schulte-result__rating {
    font-weight: 600;
    color: var(--ts-accent-primary);
}

/* Info & FAQ */
.rating-table {
    font-size: 0.9rem;
}

.faq-card .card-body {
    padding: 1.5rem;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.faq-item {
    background: var(--ts-body-bg);
    border: 1px solid var(--ts-stat-border);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.faq-item:hover {
    border-color: color-mix(in srgb, var(--ts-accent-primary) 35%, var(--ts-stat-border));
}

.faq-item[open] {
    border-color: color-mix(in srgb, var(--ts-accent-primary) 55%, var(--ts-stat-border));
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--ts-accent-primary) 18%, transparent);
}

.faq-item summary {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 1rem 1.1rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    user-select: none;
    color: var(--ts-stat-value);
    transition: color 0.15s ease, background-color 0.15s ease;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::marker {
    content: "";
}

.faq-item__q {
    flex: 1;
    line-height: 1.35;
}

.faq-item summary::after {
    content: "";
    flex-shrink: 0;
    width: 0.55rem;
    height: 0.55rem;
    border-right: 2px solid var(--ts-stat-label);
    border-bottom: 2px solid var(--ts-stat-label);
    transform: rotate(45deg);
    transition: transform 0.2s ease, border-color 0.15s ease;
    margin-top: -0.2rem;
}

.faq-item summary:hover {
    color: var(--ts-accent-primary);
}

.faq-item summary:hover::after {
    border-color: var(--ts-accent-primary);
}

.faq-item summary:focus-visible {
    outline: 2px solid var(--ts-accent-primary);
    outline-offset: -2px;
}

.faq-item[open] summary {
    background: color-mix(in srgb, var(--ts-accent-primary) 8%, transparent);
    color: var(--ts-accent-primary);
}

.faq-item[open] summary::after {
    transform: rotate(225deg);
    margin-top: 0.15rem;
    border-color: var(--ts-accent-primary);
}

.faq-item__body {
    padding: 0 1.1rem 1.1rem;
    color: var(--ts-stat-label);
    font-size: 0.925rem;
    line-height: 1.55;
    border-top: 1px solid transparent;
}

.faq-item[open] .faq-item__body {
    border-top-color: var(--ts-stat-border);
    padding-top: 0.9rem;
}

.faq-item__body code {
    font-size: 0.85em;
    padding: 0.1em 0.35em;
    border-radius: 0.3rem;
    background: color-mix(in srgb, var(--ts-stat-value) 8%, transparent);
}

.site-footer a {
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}

/* Tablet */
@media (max-width: 991.98px) {
    .schulte-controls .card-body {
        padding: 1rem 1.1rem;
    }

    .schulte-controls .section-label {
        margin-bottom: 0.65rem !important;
    }

    .schulte-controls .mode-toggle,
    .schulte-controls .size-grid,
    .schulte-controls .form-check {
        margin-bottom: 1rem !important;
    }
}

@media (min-width: 576px) {
    .stage-actions {
        grid-template-columns: 1fr 1fr;
    }

    .stage-actions .btn.d-none + .btn,
    .stage-actions .btn:only-child {
        grid-column: 1 / -1;
    }
}

/* Mobile */
@media (max-width: 575.98px) {
    .container-schulte {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }

    #theme-toggle {
        min-width: auto;
        padding-inline: 0.65rem;
    }

    #theme-toggle-label {
        display: none;
    }

    .seo-intro {
        font-size: 0.8rem;
        line-height: 1.45;
    }

    .schulte-stage > .card-body {
        padding: 0.85rem 0.75rem 1rem;
    }

    .stage-topbar {
        padding: 0.6rem 0.5rem;
        margin-bottom: 0.75rem !important;
        border-radius: 0.65rem;
    }

    .stage-topbar__label {
        font-size: 0.6rem;
        letter-spacing: 0.04em;
    }

    .stage-topbar__value {
        font-size: 1.15rem;
    }

    .schulte-grid {
        gap: 3px;
        max-width: 100%;
    }

    .schulte-cell {
        font-size: clamp(0.62rem, calc(26vw / var(--grid-size)), 1.15rem);
        border-radius: 0.25rem;
    }

    #stage-hint {
        font-size: 0.75rem;
        margin-top: 0.75rem !important;
    }

    .stage-actions {
        gap: 0.5rem;
        position: sticky;
        bottom: 0.5rem;
        z-index: 5;
        padding: 0.35rem 0 0.15rem;
        background: linear-gradient(to top, var(--ts-card-bg) 70%, transparent);
    }

    .stage-actions .btn {
        min-height: 2.7rem;
        font-size: 0.95rem;
        border-radius: 0.65rem;
        box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
    }

    .mini-stat {
        padding: 0.6rem 0.4rem;
    }

    .mini-stat__value {
        font-size: 1.05rem;
    }

    .schulte-result__inner {
        padding: 1rem 0.75rem;
    }

    .schulte-result__stat-value {
        font-size: 1.35rem;
    }

    .schulte-result__rating {
        font-size: 0.9rem;
    }

    .educational-section .card-body {
        padding: 1rem;
    }

    .educational-section p,
    .educational-section li {
        font-size: 0.925rem;
    }

    .faq-card .card-body {
        padding: 1rem;
    }

    .faq-item summary {
        padding: 0.85rem 0.9rem;
        gap: 0.7rem;
        font-size: 0.95rem;
        min-height: 3rem;
    }

    .faq-item__body {
        padding-left: 0.9rem;
        padding-right: 0.9rem;
        padding-bottom: 0.9rem;
        font-size: 0.875rem;
    }

    .modal-dialog {
        margin: 0.75rem;
    }
}

/* Very small phones */
@media (max-width: 379.98px) {
    .size-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.35rem;
    }

    .size-btn {
        font-size: 0.75rem;
        min-height: 2.35rem;
        padding: 0.35rem 0.1rem;
    }

    .stage-topbar__value {
        font-size: 1.05rem;
    }

    .schulte-cell {
        font-size: clamp(0.55rem, calc(24vw / var(--grid-size)), 1rem);
    }
}

/* Prefer no hover sticky states on touch devices */
@media (hover: none) {
    .schulte-cell:hover:not(.is-found) {
        border-color: var(--ts-cell-border);
        color: var(--ts-cell-text);
    }

    .mode-btn:hover:not(.active),
    .size-btn:hover:not(.active) {
        border-color: var(--ts-stat-border);
        color: var(--ts-stat-label);
    }
}