/**
 * Enhanced Responsive Design
 * Mobile-first approach with improved breakpoints and fluid layouts
 */

/* Enhanced CSS Variables for Responsive Design */
:root {
    /* Responsive breakpoints */
    --bp-mobile: 320px;
    --bp-mobile-lg: 480px;
    --bp-tablet: 768px;
    --bp-tablet-lg: 1024px;
    --bp-desktop: 1200px;
    --bp-desktop-lg: 1440px;

    /* Fluid spacing scale */
    --space-xs: clamp(0.5rem, 1vw, 0.75rem);
    --space-sm: clamp(0.75rem, 2vw, 1rem);
    --space-md: clamp(1rem, 3vw, 1.5rem);
    --space-lg: clamp(1.5rem, 4vw, 2rem);
    --space-xl: clamp(2rem, 5vw, 3rem);
    --space-2xl: clamp(3rem, 6vw, 4rem);

    /* Fluid typography */
    --font-size-xs: clamp(0.75rem, 1.5vw, 0.875rem);
    --font-size-sm: clamp(0.875rem, 2vw, 1rem);
    --font-size-base: clamp(1rem, 2.5vw, 1.125rem);
    --font-size-lg: clamp(1.125rem, 3vw, 1.25rem);
    --font-size-xl: clamp(1.25rem, 3.5vw, 1.5rem);
    --font-size-2xl: clamp(1.5rem, 4vw, 2rem);
    --font-size-3xl: clamp(2rem, 5vw, 2.5rem);
    --font-size-4xl: clamp(2.5rem, 6vw, 3.5rem);

    /* Container sizes */
    --container-sm: 100%;
    --container-md: 100%;
    --container-lg: var(--max-width);
    --container-xl: var(--max-width);

    /* Grid gaps */
    --grid-gap-sm: var(--space-md);
    --grid-gap-md: var(--space-lg);
    --grid-gap-lg: var(--space-xl);
}

/* Enhanced Container System */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding-left: var(--space-md);
    padding-right: var(--space-md);
}

/* Mobile-first Grid System */
.grid {
    display: grid;
    gap: var(--grid-gap-sm);
}

.grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-1 { grid-template-columns: 1fr; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }

/* Enhanced Hero Section Responsiveness */
.hero {
    padding: var(--space-2xl) 0 var(--space-xl);
}

.hero h1 {
    font-size: var(--font-size-4xl);
    line-height: 1.1;
    margin-bottom: var(--space-sm);
}

.hero-sub {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-md);
}

.hero p {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-lg);
}

.hero-btns {
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    flex-direction: column;
}

/* Enhanced Stats Grid */
.hero-stats {
    gap: var(--space-sm);
    grid-template-columns: repeat(2, 1fr);
}

.stat-item {
    padding: var(--space-md);
}

.stat-number {
    font-size: var(--font-size-2xl);
}

.stat-label {
    font-size: var(--font-size-xs);
}

/* Enhanced Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--grid-gap-sm);
}

.project-card {
    background: var(--color-bg-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.project-image {
    position: relative;
    overflow: hidden;
    height: 200px;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: var(--space-md);
}

.project-category {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

.project-content h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
    line-height: 1.3;
}

.project-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tag {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-accent-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.project-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    padding: var(--space-sm);
    background: var(--color-bg-secondary);
    border-radius: 8px;
}

.metric {
    text-align: center;
}

.metric-value {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-accent-primary);
}

.metric-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.project-actions {
    display: flex;
    gap: var(--space-sm);
    flex-direction: column;
}

/* Enhanced Navigation */
.nav-links {
    gap: var(--space-lg);
}

.mobile-menu {
    padding: var(--space-lg);
    gap: var(--space-md);
}

/* Enhanced Button Responsiveness */
.btn {
    padding: clamp(12px, 3vw, 16px) clamp(20px, 4vw, 32px);
    font-size: var(--font-size-sm);
    border-radius: clamp(8px, 2vw, 12px);
    min-height: 44px; /* Touch-friendly minimum */
}

/* Enhanced Form Elements */
.form-group {
    margin-bottom: var(--space-md);
}

.form-label {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-xs);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-sm);
    font-size: var(--font-size-base);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    min-height: 44px; /* Touch-friendly */
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* Search and Filter Controls */
.content-controls {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: var(--color-bg-card);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.search-bar {
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--space-sm) var(--space-sm) var(--space-sm) 2.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
}

.search-icon {
    position: absolute;
    left: var(--space-sm);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-secondary);
}

.filter-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--color-text-secondary);
}

.empty-state-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

/* Featured Badge */
.featured-badge {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    background: linear-gradient(135deg, #8B5CF6, #EC4899);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Loading States */
.loading-skeleton {
    background: linear-gradient(90deg, var(--color-bg-secondary) 25%, var(--color-bg-card) 50%, var(--color-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Tablet Styles */
@media (min-width: 768px) {
    .container {
        padding-left: var(--space-lg);
        padding-right: var(--space-lg);
    }

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

    .hero-btns {
        flex-direction: row;
        justify-content: center;
    }

    .hero-stats {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-md);
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--grid-gap-md);
    }

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

    .content-controls {
        flex-direction: row;
        align-items: center;
    }

    .search-bar {
        flex: 1;
    }

    .filter-row {
        flex-direction: row;
        align-items: center;
    }
}

/* Desktop Styles */
@media (min-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }

    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--grid-gap-lg);
    }

    .project-image {
        height: 220px;
    }
}

/* Large Desktop Styles */
@media (min-width: 1200px) {
    .container {
        padding-left: var(--space-xl);
        padding-right: var(--space-xl);
    }

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

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .project-image img,
    .blog-image img {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Print Styles */
@media print {
    .nav-links,
    .mobile-menu-btn,
    .theme-toggle,
    .btn,
    .project-actions,
    .blog-actions {
        display: none !important;
    }

    .project-card,
    .blog-card {
        break-inside: avoid;
        margin-bottom: var(--space-md);
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .project-card,
    .blog-card {
        border: 2px solid var(--color-text-primary);
    }

    .btn {
        border: 2px solid currentColor;
    }
}