/* Portfolio Section - App-Focused Premium Design */

.portfolio {
    background: transparent;
    margin: 0;
    padding: 80px 6%;
    width: 100%;
    transition: var(--transition-slow);
}

.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
    flex-wrap: wrap;
    position: relative;
    z-index: 100;
}

.filter-btn {
    padding: 14px 32px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.8125rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}

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

.filter-btn.active {
    background: var(--accent-gradient);
    color: #0a0a0f;
    border-color: transparent;
    box-shadow: 0 4px 20px rgba(14, 165, 233, 0.35);
}

/* Grid Container - Optimized for 3 columns on desktop */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
}

/* Portfolio Item Container */
.portfolio-item {
    opacity: 1;
    transition: opacity 0.4s ease;
}

.portfolio-item.hidden {
    display: none;
}

/* App-Focused Portfolio Card */
.portfolio-card {
    background: linear-gradient(145deg, 
                rgba(30, 30, 40, 0.7) 0%, 
                rgba(20, 20, 30, 0.8) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4), 
                0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}

.portfolio-card::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 20px;
    padding: 2px;
    background: linear-gradient(135deg, 
        var(--accent-primary), 
        var(--accent-gold));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.portfolio-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 70px rgba(14, 165, 233, 0.2),
                0 0 60px rgba(14, 165, 233, 0.08),
                0 0 0 1px rgba(14, 165, 233, 0.2) inset;
    border-color: rgba(14, 165, 233, 0.3);
}

.portfolio-card:hover::before {
    opacity: 0.6;
}

/* Portfolio Image Section */
.portfolio-image {
    position: relative;
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, rgba(240, 245, 255, 0.15), rgba(255, 250, 240, 0.1)),
                radial-gradient(circle at 30% 50%, rgba(14, 165, 233, 0.08), transparent 70%),
                radial-gradient(circle at 70% 50%, rgba(154, 123, 26, 0.06), transparent 70%),
                linear-gradient(135deg, rgba(20, 20, 28, 0.5), rgba(30, 30, 40, 0.5));
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 20px;
}

.portfolio-image img {
    max-width: 85%;
    max-height: 85%;
    width: auto;
    height: auto;
    object-fit: contain;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.3s ease;
    filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.4)) brightness(1.1) contrast(1.05);
}

.portfolio-card:hover .portfolio-image img {
    transform: scale(1.08) translateY(-4px);
}

/* Portfolio Content Section */
.portfolio-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    flex: 1;
    position: relative;
    z-index: 2;
    pointer-events: auto;
}

/* Category Badge */
.portfolio-category {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 6px 14px;
    background: rgba(14, 165, 233, 0.1);
    border-radius: 20px;
    width: fit-content;
    border: 1px solid rgba(14, 165, 233, 0.2);
}

.portfolio-category i {
    font-size: 0.875rem;
}

/* Portfolio Title */
.portfolio-title {
    font-size: 1.375rem;
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
    margin: 0;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

/* Portfolio Description */
.portfolio-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
    flex: 1;
}

/* Technology Badges */
.portfolio-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 4px;
}

.tech-badge {
    padding: 4px 12px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    transition: all 0.3s ease;
    letter-spacing: 0.02em;
}

.tech-badge:hover {
    background: rgba(14, 165, 233, 0.15);
    border-color: rgba(14, 165, 233, 0.3);
    transform: translateY(-2px);
}

/* Portfolio Action Buttons */
.portfolio-actions {
    display: flex;
    gap: 12px;
    margin-top: 8px;
    pointer-events: auto;
    position: relative;
    z-index: 10;
}

.portfolio-btn {
    flex: 1;
    padding: 10px 16px;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    cursor: pointer;
    border: 2px solid transparent;
    pointer-events: auto;
    position: relative;
    z-index: 10;
}

.btn-code {
    background: transparent;
    color: var(--accent-primary);
    border-color: rgba(14, 165, 233, 0.3);
}

.btn-code:hover {
    background: linear-gradient(135deg, var(--accent-primary), rgba(14, 165, 233, 0.8));
    color: #0a0a0f;
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(14, 165, 233, 0.4);
}

.portfolio-btn i {
    font-size: 0.875rem;
}

/* Responsive Design - Tablet */
@media (max-width: 1200px) {
    .portfolio {
        padding: 70px 5%;
    }

    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 28px;
        max-width: 1200px;
    }

    .portfolio-image {
        height: 160px;
        padding: 18px;
    }

    .portfolio-content {
        padding: 22px;
        gap: 12px;
    }

    .portfolio-title {
        font-size: 1.25rem;
    }

    .portfolio-description {
        font-size: 0.8125rem;
    }
}

/* Responsive Design - Small Tablet */
@media (max-width: 768px) {
    .portfolio {
        padding: 60px 5%;
    }

    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .portfolio-filter {
        gap: 12px;
        margin-bottom: 45px;
    }

    .filter-btn {
        padding: 10px 24px;
        font-size: 0.75rem;
    }

    .portfolio-image {
        height: 150px;
        padding: 16px;
    }

    .portfolio-content {
        padding: 20px;
        gap: 10px;
    }

    .portfolio-title {
        font-size: 1.125rem;
    }

    .portfolio-description {
        font-size: 0.8rem;
    }

    .tech-badge {
        padding: 3px 10px;
        font-size: 0.65rem;
    }

    .portfolio-btn {
        padding: 8px 14px;
        font-size: 0.75rem;
    }
}

/* Mobile - 1 Column */
@media (max-width: 640px) {
    .portfolio {
        padding: 50px 4%;
    }

    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        max-width: 100%;
    }

    .filter-btn {
        padding: 8px 20px;
        font-size: 0.6875rem;
    }

    .portfolio-image {
        height: 140px;
        padding: 14px;
    }

    .portfolio-content {
        padding: 18px;
        gap: 10px;
    }

    .portfolio-title {
        font-size: 1rem;
    }

    .portfolio-description {
        font-size: 0.75rem;
    }

    .portfolio-actions {
        flex-direction: row;
    }

    .portfolio-btn {
        width: auto;
        padding: 8px 14px;
        font-size: 0.7rem;
    }

    .tech-badge {
        font-size: 0.6rem;
        padding: 3px 8px;
    }

    .portfolio-category {
        font-size: 0.65rem;
    }
}

/* Light Mode Styles */
[data-theme="light"] .portfolio-card {
    background: linear-gradient(145deg, 
                rgba(240, 240, 250, 0.9) 0%, 
                rgba(220, 230, 250, 0.85) 100%);
    border: 1px solid rgba(100, 150, 220, 0.3);
    box-shadow: 0 10px 40px rgba(50, 100, 180, 0.15), 
                0 0 0 1px rgba(100, 150, 220, 0.1) inset;
}

[data-theme="light"] .portfolio-card:hover {
    background: linear-gradient(145deg, 
                rgba(230, 240, 255, 0.95) 0%, 
                rgba(210, 230, 255, 0.9) 100%);
    box-shadow: 0 24px 70px rgba(50, 100, 180, 0.25),
                0 0 60px rgba(50, 100, 180, 0.1),
                0 0 0 1px rgba(50, 100, 180, 0.2) inset;
    border-color: rgba(50, 100, 180, 0.4);
}

[data-theme="light"] .portfolio-image {
    background: radial-gradient(circle at 30% 50%, rgba(100, 150, 220, 0.1), transparent 70%),
                radial-gradient(circle at 70% 50%, rgba(180, 150, 80, 0.08), transparent 70%),
                linear-gradient(135deg, rgba(220, 230, 250, 0.7), rgba(240, 240, 255, 0.7));
    border-bottom: 1px solid rgba(100, 150, 220, 0.15);
}

[data-theme="light"] .portfolio-image img {
    filter: drop-shadow(0 4px 12px rgba(100, 150, 220, 0.2)) brightness(0.95) contrast(1.02);
}

[data-theme="light"] .portfolio-category {
    background: rgba(100, 150, 220, 0.15);
    border: 1px solid rgba(100, 150, 220, 0.3);
    color: #1d4a9f;
}

[data-theme="light"] .portfolio-title {
    color: #1a1a2e;
}

[data-theme="light"] .portfolio-description {
    color: #4a5568;
}

[data-theme="light"] .tech-badge {
    background: rgba(100, 150, 220, 0.1);
    border: 1px solid rgba(100, 150, 220, 0.25);
    color: #1d4a9f;
}

[data-theme="light"] .tech-badge:hover {
    background: rgba(100, 150, 220, 0.2);
    border-color: rgba(100, 150, 220, 0.4);
}

[data-theme="light"] .btn-code {
    color: #1d4a9f;
    border-color: rgba(100, 150, 220, 0.4);
}

[data-theme="light"] .btn-code:hover {
    background: linear-gradient(135deg, #5a8fd4, #7ab0e0);
    color: white;
    border-color: #5a8fd4;
    box-shadow: 0 6px 20px rgba(90, 143, 212, 0.35);
}