/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #ffffff;
    --surface-color: #f8f9fa;
    --text-primary: #1a1a1a;
    --text-secondary: #6b6b6b;
    --accent-color: #6EC1E4;
    --border-color: #e0e0e0;
    --hover-color: #f0f0f0;
    --transition-speed: 0.3s;
    --border-radius: 16px;
    --spacing-unit: 1.5rem;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 0;
    margin: 0;
}

/* Header */
.portfolio-header {
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(248, 249, 250, 0.95);
    transition: padding var(--transition-speed) ease;
}

.portfolio-header.scrolled {
    padding: 0.75rem 0;
}

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

.portfolio-header.scrolled .portfolio-updated {
    font-size: 0;
    margin-top: 0;
    opacity: 0;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.header-title-group {
    text-align: right;
}

.portfolio-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    transition: font-size var(--transition-speed) ease;
}

.portfolio-updated {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    transition: all var(--transition-speed) ease;
    overflow: hidden;
}

/* Main Content */
.portfolio-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* Section Styles */
.portfolio-section {
    margin-bottom: 5rem;
}

.portfolio-section:last-child {
    margin-bottom: 0;
}

.section-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2rem;
    letter-spacing: -0.01em;
}

/* Portfolio Grid */
.portfolio-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.projects-grid {
    grid-template-columns: 1fr;
    max-width: 600px;
}

.projects-grid .portfolio-item {
    aspect-ratio: auto;
    display: flex;
    flex-direction: column;
}

.video-grid {
    grid-template-columns: repeat(3, 1fr);
}

.video-grid .portfolio-item {
    aspect-ratio: auto;
    display: flex;
    flex-direction: column;
}

.webdesign-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

.webdesign-grid .portfolio-item {
    aspect-ratio: auto;
    display: flex;
    flex-direction: column;
}

/* Portfolio Items */
.portfolio-item {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    aspect-ratio: 16 / 9;
    position: relative;
}

.portfolio-item-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.portfolio-item:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
    box-shadow: 0 12px 32px rgba(110, 193, 228, 0.25);
}

.placeholder-content {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(110, 193, 228, 0.08) 0%, rgba(110, 193, 228, 0.03) 100%);
}

.placeholder-icon {
    font-size: 3rem;
    opacity: 0.6;
}

.placeholder-text {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    text-align: center;
}

/* Portfolio Image */
.portfolio-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

/* Portfolio Item Content */
.portfolio-item-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.portfolio-item-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.01em;
}

.portfolio-item-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        padding: 0 1rem;
    }

    .portfolio-title {
        font-size: 1.5rem;
    }

    .portfolio-main {
        padding: 2rem 1rem;
    }

    .portfolio-section {
        margin-bottom: 3rem;
    }

    .section-title {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }

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

    .video-grid,
    .webdesign-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) and (min-width: 769px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .projects-grid {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .portfolio-title {
        font-size: 1.25rem;
    }

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

    .placeholder-icon {
        font-size: 2.5rem;
    }

    .placeholder-text {
        font-size: 0.875rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.portfolio-section {
    animation: fadeInUp 0.6s ease-out;
}

.portfolio-section:nth-child(2) {
    animation-delay: 0.1s;
}

.portfolio-section:nth-child(3) {
    animation-delay: 0.2s;
}

/* Footer */
.portfolio-footer {
    text-align: center;
    padding: 2rem 1rem;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
    background: rgba(248, 249, 250, 0.95);
}

.footer-copyright {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }

    .portfolio-item {
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}