/* ===================== PORTFOLIO PAGE ===================== */

/* Hero / intro */
.portfolio-hero {
    padding-top: 96px; /* navbar + spacing */
    padding-bottom: 48px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.portfolio-hero-content {
    max-width: 700px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-light);
    text-decoration: none;
    margin-bottom: 20px;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--primary-color);
}

.back-link svg {
    width: 16px;
    height: 16px;
}

.portfolio-title {
    font-size: clamp(28px, 5vw, 40px);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.2;
}

.portfolio-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 560px;
}

/* Filters */
.portfolio-content {
    padding: 40px 20px 80px;
    background-color: var(--bg-primary);
}

.portfolio-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}

.filter-btn {
    padding: 7px 16px;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Grid */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

/* Exhibit card */
.exhibit-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.exhibit-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.exhibit-card.hidden {
    display: none;
}

/* Preview area — image, gif, or placeholder */
.exhibit-preview {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background-color: var(--bg-tertiary);
    position: relative;
}

.exhibit-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.exhibit-preview-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0a2540 0%, #0d3868 50%, #0f4c81 100%);
    color: rgba(255, 255, 255, 0.3);
}

.exhibit-preview-placeholder svg {
    width: 64px;
    height: 64px;
}

/* Card body */
.exhibit-body {
    padding: 20px;
}

.exhibit-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.exhibit-category {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary-color);
    background-color: rgba(0, 102, 255, 0.08);
    padding: 3px 10px;
    border-radius: 12px;
}

.exhibit-github {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    color: var(--text-light);
    transition: var(--transition);
}

.exhibit-github:hover {
    color: var(--text-primary);
    background-color: var(--bg-secondary);
}

.exhibit-github svg {
    width: 18px;
    height: 18px;
}

.exhibit-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.3;
}

.exhibit-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 14px;
}

.exhibit-detail-pending {
    font-style: italic;
    color: var(--text-light);
    font-size: 13px;
}

.exhibit-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.exhibit-tags span {
    display: inline-block;
    padding: 3px 10px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Live demo link (optional per card) */
.exhibit-links {
    display: flex;
    gap: 8px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
}

.exhibit-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 13px;
    font-weight: 500;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.exhibit-link:hover {
    color: var(--primary-dark);
}

.exhibit-link svg {
    width: 14px;
    height: 14px;
}

/* Empty state */
.portfolio-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
    font-size: 15px;
}

/* ===================== TABLET ===================== */
@media (max-width: 1024px) {
    .portfolio-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

/* ===================== MOBILE ===================== */
@media (max-width: 768px) {
    .portfolio-hero {
        padding-top: 80px;
        padding-bottom: 32px;
    }

    .portfolio-hero-content {
        padding: 0 16px;
    }

    .portfolio-title {
        font-size: 26px;
    }

    .portfolio-subtitle {
        font-size: 14px;
    }

    .portfolio-content {
        padding: 28px 16px 60px;
    }

    .portfolio-content .container {
        padding: 0;
    }

    .portfolio-filters {
        gap: 6px;
        margin-bottom: 24px;
    }

    .filter-btn {
        padding: 6px 12px;
        font-size: 12px;
    }

    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .exhibit-body {
        padding: 16px;
    }

    .exhibit-title {
        font-size: 16px;
    }

    .exhibit-description {
        font-size: 13px;
    }

    .exhibit-tags span {
        font-size: 10px;
        padding: 2px 8px;
    }
}