/* =========================================================
   Somervilles Portfolio Gallery — style.css v1.1.0
   Replicates the Somervilles fit-out project gallery style:
   full-bleed image grid, dark overlay reveal on hover,
   category label + title + CTA link
   ========================================================= */

/* ── CSS Custom Properties ── */
:root {
    --smpf-overlay-bg:      rgba(0, 0, 0, 0.72);
    --smpf-title-color:     #ffffff;
    --smpf-category-color:  rgba(255, 255, 255, 0.60);
    --smpf-excerpt-color:   rgba(255, 255, 255, 0.75);
    --smpf-cta-color:       #ffffff;
    --smpf-filter-color:    #1a1a1a;
    --smpf-filter-active:   #1a1a1a;
    --smpf-gap:             2px;
    --smpf-transition:      0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --smpf-font-category:   0.72rem;
    --smpf-font-title:      1.15rem;
    --smpf-font-excerpt:    0.85rem;
    --smpf-letter-spacing:  0.12em;
}

/* ── Filter Bar ── */
.smpf-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0 2rem;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(0,0,0,0.10);
}

.smpf-filter-btn {
    position: relative;
    background: none;
    border: none;
    padding: 0.25rem 0;
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: var(--smpf-letter-spacing);
    text-transform: uppercase;
    color: var(--smpf-filter-color);
    cursor: pointer;
    opacity: 0.45;
    transition: opacity 0.2s ease;
}

.smpf-filter-btn::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--smpf-filter-active);
    transition: width 0.3s ease;
}

.smpf-filter-btn:hover,
.smpf-filter-btn:focus-visible {
    opacity: 0.85;
    outline: none;
}

.smpf-filter-btn.active {
    opacity: 1;
}

.smpf-filter-btn.active::after {
    width: 100%;
}

/* ── Grid Container ── */
.smpf-grid {
    display: grid;
    gap: var(--smpf-gap);
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.smpf-grid.smpf-cols-1 { grid-template-columns: 1fr; }
.smpf-grid.smpf-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.smpf-grid.smpf-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.smpf-grid.smpf-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ── Item ── */
.smpf-item {
    position: relative;
    overflow: hidden;
    display: block;
    background: #111;
}

.smpf-item-link {
    display: block;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

/* ── Image ── */
.smpf-item-image {
    display: block;
    aspect-ratio: 3 / 2;
    overflow: hidden;
}

.smpf-item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--smpf-transition),
                filter var(--smpf-transition);
    will-change: transform;
}

/* ── Overlay ── */
.smpf-item-overlay {
    position: absolute;
    inset: 0;
    background: var(--smpf-overlay-bg);
    display: flex;
    align-items: flex-end;
    padding: 2rem 1.75rem;
    opacity: 0;
    transition: opacity var(--smpf-transition);
}

.smpf-item-info {
    transform: translateY(12px);
    transition: transform var(--smpf-transition);
}

/* ── Text inside overlay ── */
.smpf-item-category {
    display: block;
    font-size: var(--smpf-font-category);
    font-weight: 600;
    letter-spacing: var(--smpf-letter-spacing);
    text-transform: uppercase;
    color: var(--smpf-category-color);
    margin-bottom: 0.4rem;
}

.smpf-item-title {
    font-size: var(--smpf-font-title);
    font-weight: 500;
    color: var(--smpf-title-color);
    margin: 0 0 0.5rem;
    line-height: 1.3;
    letter-spacing: 0.01em;
}

.smpf-item-excerpt {
    font-size: var(--smpf-font-excerpt);
    color: var(--smpf-excerpt-color);
    margin: 0 0 0.85rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.smpf-item-cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: var(--smpf-letter-spacing);
    text-transform: uppercase;
    color: var(--smpf-cta-color);
}

.smpf-item-cta svg {
    transition: transform 0.25s ease;
}

/* ══════════════════════════════════
   HOVER EFFECTS
══════════════════════════════════ */

/* Effect: Overlay (Somervilles default) */
.smpf-effect-overlay .smpf-item-link:hover .smpf-item-image img,
.smpf-effect-overlay .smpf-item-link:focus-within .smpf-item-image img {
    transform: scale(1.06);
}
.smpf-effect-overlay .smpf-item-link:hover .smpf-item-overlay,
.smpf-effect-overlay .smpf-item-link:focus-within .smpf-item-overlay {
    opacity: 1;
}
.smpf-effect-overlay .smpf-item-link:hover .smpf-item-info,
.smpf-effect-overlay .smpf-item-link:focus-within .smpf-item-info {
    transform: translateY(0);
}
.smpf-effect-overlay .smpf-item-link:hover .smpf-item-cta svg {
    transform: translateX(4px);
}

/* Effect: Zoom only */
.smpf-effect-zoom .smpf-item-link:hover .smpf-item-image img,
.smpf-effect-zoom .smpf-item-link:focus-within .smpf-item-image img {
    transform: scale(1.1);
}
.smpf-effect-zoom .smpf-item-overlay {
    align-items: flex-end;
    opacity: 1;
    background: linear-gradient(to top, rgba(0,0,0,0.65) 0%, transparent 55%);
}
.smpf-effect-zoom .smpf-item-info {
    transform: translateY(0);
}

/* Effect: Grayscale → Color */
.smpf-effect-grayscale .smpf-item-image img {
    filter: grayscale(100%);
}
.smpf-effect-grayscale .smpf-item-link:hover .smpf-item-image img,
.smpf-effect-grayscale .smpf-item-link:focus-within .smpf-item-image img {
    filter: grayscale(0%);
    transform: scale(1.04);
}
.smpf-effect-grayscale .smpf-item-link:hover .smpf-item-overlay,
.smpf-effect-grayscale .smpf-item-link:focus-within .smpf-item-overlay {
    opacity: 1;
}
.smpf-effect-grayscale .smpf-item-link:hover .smpf-item-info,
.smpf-effect-grayscale .smpf-item-link:focus-within .smpf-item-info {
    transform: translateY(0);
}

/* Effect: Slide Up */
.smpf-effect-slide .smpf-item-overlay {
    transform: translateY(100%);
    opacity: 1;
    transition: transform var(--smpf-transition);
}
.smpf-effect-slide .smpf-item-link:hover .smpf-item-overlay,
.smpf-effect-slide .smpf-item-link:focus-within .smpf-item-overlay {
    transform: translateY(0);
}
.smpf-effect-slide .smpf-item-link:hover .smpf-item-image img,
.smpf-effect-slide .smpf-item-link:focus-within .smpf-item-image img {
    transform: scale(1.04);
}
.smpf-effect-slide .smpf-item-info {
    transform: translateY(0);
}

/* ── Filter animation ── */
.smpf-item {
    transition: opacity 0.35s ease, transform 0.35s ease;
}
.smpf-item.smpf-hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.97);
}

/* ── No results ── */
.smpf-no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: #888;
    font-size: 0.9rem;
}

/* ──────────────────────────────
   RESPONSIVE
────────────────────────────── */

@media ( max-width: 1024px ) {
    .smpf-grid.smpf-cols-4 {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .smpf-item-title {
        font-size: 1rem;
    }
}

@media ( max-width: 768px ) {
    .smpf-grid.smpf-cols-3,
    .smpf-grid.smpf-cols-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .smpf-filter-bar {
        gap: 0 1.25rem;
    }
    .smpf-item-overlay {
        padding: 1.25rem 1rem;
    }
}

@media ( max-width: 480px ) {
    .smpf-grid.smpf-cols-2,
    .smpf-grid.smpf-cols-3,
    .smpf-grid.smpf-cols-4 {
        grid-template-columns: 1fr;
    }
    .smpf-item-excerpt {
        display: none;
    }
}

/* ── Dark Mode ── */
@media ( prefers-color-scheme: dark ) {
    .smpf-filter-btn {
        color: #e0e0e0;
    }
    .smpf-filter-btn::after {
        background: #e0e0e0;
    }
    .smpf-filter-bar {
        border-bottom-color: rgba(255,255,255,0.10);
    }
}

/* ── Accessibility: reduced motion ── */
@media ( prefers-reduced-motion: reduce ) {
    .smpf-item-image img,
    .smpf-item-overlay,
    .smpf-item-info,
    .smpf-item,
    .smpf-filter-btn,
    .smpf-effect-slide .smpf-item-overlay {
        transition: none !important;
    }
}