/**
 * NazmulHub Portfolio v3.3.0 - Full Kinetic Design Engine
 * 
 * Features:
 * - Ultra-Modern Glassmorphic UI
 * - Vertical Auto-Scroll Hover Engine
 * - Kinetic Category Filtering Transitions
 * - 2026 Fluid Responsive Architecture
 *
 * @package NazmulHub_Portfolio
 * @version 3.3.0
 */

:root {
    /* Dynamics injected via nazmulhub-portfolio.php */
    --naz-pf-accent: #6366f1;
    --naz-pf-accent-rgb: 99, 102, 241;
    --naz-pf-radius: 20px;
    --naz-pf-card-height: 450px;
    --naz-pf-scroll-duration: 5s;
    
    /* Design Tokens */
    --naz-pf-glass: rgba(255, 255, 255, 0.85);
    --naz-pf-glass-border: rgba(255, 255, 255, 0.4);
    --naz-pf-text-main: #0f172a;
    --naz-pf-text-muted: #475569;
    --naz-pf-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Kinetic Ease */
    --naz-pf-ease: cubic-bezier(0.2, 1, 0.3, 1);
    --naz-pf-transition: 0.4s var(--naz-pf-ease);
}

.naz-portfolio-container {
    width: 100%;
    margin: 2rem auto;
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
    box-sizing: border-box;
}

/* --- 1. FILTER NAVIGATION (Category Tabs) --- */

.naz-portfolio-filter-nav {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
    padding: 0 10px;
}

.naz-portfolio-filter {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    background: #f1f5f9;
    padding: 6px;
    border-radius: 100px;
    list-style: none;
    margin: 0;
    gap: 5px;
    border: 1px solid rgba(0,0,0,0.05);
}

.naz-portfolio-filter-item {
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 700;
    color: var(--naz-pf-text-muted);
    cursor: pointer;
    border-radius: 100px;
    transition: var(--naz-pf-transition);
    user-select: none;
    border: 1px solid transparent;
}

.naz-portfolio-filter-item:hover {
    color: var(--naz-pf-text-main);
    background: rgba(255,255,255,0.5);
}

.naz-portfolio-filter-item.active {
    background: var(--naz-pf-accent);
    color: #ffffff;
    border-color: var(--naz-pf-accent);
    box-shadow: 0 8px 15px rgba(var(--naz-pf-accent-rgb), 0.3);
}

/* --- 2. THE GRID SYSTEM --- */

.naz-portfolio-grid {
    display: grid;
    /* Grid columns are dynamic via --naz-pf-cols */
    grid-template-columns: repeat(var(--naz-pf-cols, 3), 1fr);
    gap: 35px;
    transition: opacity 0.3s ease;
}

.naz-portfolio-item {
    position: relative;
    height: var(--naz-pf-card-height);
    background: #f8fafc;
    border-radius: var(--naz-pf-radius);
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: var(--naz-pf-shadow);
    transition: transform 0.4s var(--naz-pf-ease), opacity 0.4s ease, box-shadow 0.4s ease;
    display: flex;
    flex-direction: column;
    opacity: 0; /* Handled by JS Entrance Reveal */
    transform: translateY(20px);
}

/* Entrance Animation Class (Triggered by JS) */
.naz-portfolio-item.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.naz-portfolio-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 50px -12px rgba(0, 0, 0, 0.15);
}

/* Filtering logic animation states */
.naz-portfolio-item.is-filtered-out {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
    pointer-events: none;
}

/* --- 3. KINETIC SCROLL ENGINE (Vertical Hover) --- */

.naz-portfolio-image-wrapper {
    width: 100%;
    height: 100%;
    overflow: hidden;
    position: relative;
    background: #e2e8f0;
}

.naz-portfolio-image-wrapper img {
    width: 100% !important;
    height: auto !important;
    position: absolute;
    top: 0;
    left: 0;
    transition: transform var(--naz-pf-scroll-duration) linear !important;
    display: block;
    margin: 0 !important;
    max-width: none !important;
}

/* The Magic Scroll Logic: Moves the image up based on its height */
.naz-portfolio-item:hover .naz-portfolio-image-wrapper img {
    transform: translateY(calc(-100% + var(--naz-pf-card-height)));
}

/* --- 4. GLASSMORPHIC CARD OVERLAY --- */

.naz-portfolio-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 25px;
    background: var(--naz-pf-glass);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-top: 1px solid var(--naz-pf-glass-border);
    transform: translateY(85px); /* Initially hide details */
    transition: transform 0.4s var(--naz-pf-ease);
    box-sizing: border-box;
}

.naz-portfolio-item:hover .naz-portfolio-overlay {
    transform: translateY(0);
}

.naz-portfolio-category {
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--naz-pf-accent);
    letter-spacing: 2px;
    margin-bottom: 8px;
    display: block;
}

.naz-portfolio-title {
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 10px 0;
    color: var(--naz-pf-text-main);
    line-height: 1.2;
}

.naz-portfolio-title a {
    text-decoration: none;
    color: inherit;
}

/* Detailed content revealed on hover */
.naz-portfolio-details {
    opacity: 0;
    transition: opacity 0.3s ease 0.15s;
}

.naz-portfolio-item:hover .naz-portfolio-details {
    opacity: 1;
}

.naz-portfolio-client-meta {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.naz-portfolio-client-meta small {
    display: block;
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--naz-pf-text-muted);
    margin-bottom: 2px;
}

.naz-portfolio-client-meta strong {
    font-size: 14px;
    color: var(--naz-pf-text-main);
}

.naz-portfolio-actions {
    margin-top: 20px;
}

.naz-portfolio-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--naz-pf-accent);
    color: #ffffff !important;
    padding: 10px 24px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 700;
    text-decoration: none;
    transition: filter 0.2s, transform 0.2s;
}

.naz-portfolio-btn:hover {
    filter: brightness(1.1);
    transform: scale(1.05);
}

.naz-portfolio-btn .dashicons {
    font-size: 16px;
    width: 16px;
    height: 16px;
    line-height: 1;
}

/* --- 5. RESPONSIVE BREAKPOINTS --- */

@media (max-width: 1200px) {
    .naz-portfolio-grid {
        grid-template-columns: repeat(min(var(--naz-pf-cols, 3), 2), 1fr);
        gap: 25px;
    }
}

@media (max-width: 768px) {
    .naz-portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .naz-portfolio-container {
        margin: 1rem auto;
    }

    .naz-portfolio-overlay {
        transform: translateY(0); /* Always show on mobile for UX */
    }

    .naz-portfolio-details {
        opacity: 1;
    }

    :root {
        --naz-pf-card-height: 380px;
    }
}

/* Accessibility */
.naz-portfolio-item:focus-within {
    outline: 3px solid rgba(var(--naz-pf-accent-rgb), 0.5);
    outline-offset: 5px;
}