:root {
    --color-primary: #aa3a3a;
    --color-primary-dark: #8d3030;
    --color-accent: #4e342e;
    --color-text: #cccccc;
    --color-text-strong: #f0eaea;
    --color-button-disabled: #8d3030;
    --color-cell-overlay: rgba(91, 91, 91, 0.55);
    --color-border: #5b5b5b;
    --font: "Source Sans 3", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    height: 100%;
    font-family: var(--font);
    background: #2a1616;
    color: var(--color-text);
}

.presentation-body {
    overflow: hidden;
}

.app-shell {
    display: grid;
    grid-template-rows: 64px 1fr 64px;
    height: 100dvh;
    min-height: 100vh;
}

.titlebar,
.actionbar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 0.9rem;
    background: var(--color-primary-dark);
}

.content-view {
    background: var(--color-primary);
    padding: 1rem;
    overflow: auto;
}

.page-title {
    flex: 8;
    margin: 0;
    text-align: center;
    font-size: clamp(1.1rem, 2.4vw, 1.7rem);
    font-weight: 700;
    color: var(--color-text-strong);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.titlebar-spacer,
.actionbar-spacer {
    flex: 1;
}

.icon-btn,
.text-btn {
    appearance: none;
    border: 0;
    background: transparent;
    color: var(--color-text);
    fill: currentColor;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    padding: 0.2rem;
    transition: opacity 0.2s ease, transform 0.15s ease;
}

.icon-btn:hover:not(.is-disabled),
.text-btn:hover:not(.is-disabled),
.text-btn:hover:not(:disabled) {
    opacity: 0.85;
    transform: scale(1.05);
}

.icon-btn svg {
    width: 28px;
    height: 28px;
    fill: currentColor;
}

.icon-btn.is-disabled,
.text-btn.is-disabled,
.text-btn:disabled,
.icon-btn:disabled {
    color: var(--color-button-disabled);
    pointer-events: none;
    opacity: 0.45;
}

.text-btn {
    font-weight: 700;
    font-size: 1.35rem;
}

.text-btn-lg,
.help-btn {
    font-size: 1.8rem;
}

.selection-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
    height: 100%;
    align-content: start;
}

.selection-cell {
    position: relative;
    display: block;
    min-height: 140px;
    aspect-ratio: 16 / 10;
    border: 1px solid var(--color-border);
    text-decoration: none;
    color: var(--color-text-strong);
    overflow: hidden;
    background: var(--color-primary-dark);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.selection-cell:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.25);
}

.selection-cell-image {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-color: var(--color-primary-dark);
}

.selection-cell-label {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 0.55rem 0.7rem;
    background: var(--color-cell-overlay);
    font-weight: 600;
    text-align: center;
}

.details-layout {
    display: grid;
    grid-template-columns: minmax(160px, 22%) 1px 1fr;
    gap: 0.9rem;
    height: 100%;
    min-height: 0;
}

.details-layout:not(:has(.details-media)) {
    grid-template-columns: 1fr;
}

.details-media {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.details-divider {
    background: var(--color-primary-dark);
}

.media-thumb {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    color: var(--color-text);
    text-decoration: none;
}

.media-thumb img,
.media-thumb video,
.video-placeholder {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    background: var(--color-primary-dark);
    border: 1px solid var(--color-border);
}

.video-placeholder {
    display: grid;
    place-items: center;
    font-size: 2rem;
}

.details-main {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 0;
    overflow: auto;
}

.details-text {
    white-space: pre-wrap;
    line-height: 1.55;
    font-size: var(--details-font-size, 1.15rem);
    color: var(--color-text-strong);
}

.details-with-selection .details-selection .selection-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.empty-state {
    height: 100%;
    display: grid;
    place-content: center;
    text-align: center;
    gap: 1rem;
    font-size: 1.25rem;
}

.admin-link {
    color: var(--color-text-strong);
}

.gallery {
    position: relative;
    height: 100%;
    display: grid;
    grid-template-columns: 56px 1fr 56px;
    align-items: stretch;
    gap: 0.5rem;
}

.gallery-stage {
    position: relative;
    overflow: hidden;
}

.gallery-slide {
    position: absolute;
    inset: 0;
    display: none;
    place-items: center;
}

.gallery-slide.is-active {
    display: grid;
    animation: fadeIn 0.35s ease;
}

.gallery-slide img,
.gallery-slide video {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.video-frame {
    position: relative;
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
}

.video-frame video {
    width: 100%;
    height: 100%;
    background: #000;
}

.video-play-overlay {
    position: absolute;
    inset: auto;
    width: 84px;
    height: 84px;
    border-radius: 50%;
    border: 0;
    background: rgba(0, 0, 0, 0.45);
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
}

.gallery-caption {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 0.7rem 1rem;
    text-align: center;
    background: var(--color-cell-overlay);
    font-weight: 600;
}

.gallery-nav {
    border: 0;
    background: transparent;
    color: var(--color-text-strong);
    font-size: 3rem;
    cursor: pointer;
}

.gallery-nav.is-disabled {
    opacity: 0.2;
    pointer-events: none;
}

.help-content {
    max-width: 960px;
    margin: 0 auto;
}

.help-content h2 {
    margin-top: 0;
    color: var(--color-text-strong);
}

.help-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem 2rem;
}

.help-item {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 0.75rem;
    align-items: center;
}

.help-icon {
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    color: var(--color-text);
}

.help-icon svg {
    width: 28px;
    height: 28px;
    fill: currentColor;
}

.help-icon.text-icon {
    font-weight: 700;
    font-size: 1.2rem;
}

.help-icon.text-icon.lg {
    font-size: 1.7rem;
}

.toast {
    position: fixed;
    left: 50%;
    bottom: 5.5rem;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    padding: 0.7rem 1.1rem;
    border-radius: 4px;
    z-index: 20;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateX(12px); }
    to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 900px) {
    .selection-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .details-layout {
        grid-template-columns: 1fr;
    }

    .details-divider {
        display: none;
    }

    .help-grid {
        grid-template-columns: 1fr;
    }

    .app-shell {
        grid-template-rows: 56px 1fr 56px;
    }
}

@media (max-width: 600px) {
    .selection-grid {
        grid-template-columns: 1fr;
    }

    .gallery {
        grid-template-columns: 40px 1fr 40px;
    }
}