/* Minimalissimo-inspired design system - Adaptive Theme */
:root {
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    --transition: all 0.2s ease;
}

/* Light theme (default) */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f8f8;
    --text-primary: #000000;
    --text-secondary: #333333;
    --text-tertiary: #666666;
    --border-color: #000000;
    --border-light: #e5e5e5;
    --nav-bg: rgba(255, 255, 255, 0.95);
    --loading-bg: #f0f0f0;
    --loading-highlight: #e0e0e0;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #111111;
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
        --text-tertiary: #999999;
        --border-color: #ffffff;
        --border-light: #222222;
        --nav-bg: rgba(0, 0, 0, 0.95);
        --loading-bg: #222222;
        --loading-highlight: #333333;
    }
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    font-weight: 300;
    letter-spacing: -0.01em;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 400;
    line-height: var(--line-height-tight);
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--text-primary);
}

/* Navigation */
.navigation {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    z-index: 100;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: var(--font-size-lg);
    font-weight: 500;
    letter-spacing: -0.02em;
}

.site-title a {
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.menu-item {
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: var(--transition);
}

.menu-item:hover,
.menu-item.active {
    color: var(--text-primary);
}

/* Main content */
.content {
    margin-top: 80px;
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-2xl);
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

/* Intro section */
.intro {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.intro-text {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: var(--line-height-relaxed);
}

/* Photo grid */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.photo-item {
    display: block;
}

.photo-link {
    display: block;
    transition: var(--transition);
}

.photo-link:hover .photo-frame {
    border-color: var(--text-primary);
    transform: translateY(-2px);
}

.photo-link:hover .photo-frame img {
    transform: scale(1.02);
}

.photo-frame {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: var(--bg-secondary);
    margin-bottom: var(--spacing-md);
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.photo-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.photo-meta {
    padding: 0 var(--spacing-xs);
}

.photo-title {
    font-size: var(--font-size-base);
    font-weight: 400;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    line-height: var(--line-height-tight);
}

.photo-date {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 400;
}

/* Post page */
.post-main {
    margin-top: 80px;
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-2xl);
}

.post-article {
    max-width: 800px;
    margin: 0 auto;
}

.post-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.post-title {
    font-size: var(--font-size-3xl);
    font-weight: 400;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    line-height: var(--line-height-tight);
}

.post-meta {
    margin-bottom: var(--spacing-lg);
}

.post-date {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 400;
}

.post-content {
    margin-bottom: var(--spacing-3xl);
    line-height: var(--line-height-relaxed);
}

.post-content img {
    width: 100%;
    height: auto;
    margin: var(--spacing-xl) 0;
    display: block;
    border: 1px solid var(--border-color);
    transition: border-color 0.3s ease;
}

.post-content p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.post-content h1,
.post-content h2,
.post-content h3 {
    margin: var(--spacing-xl) 0 var(--spacing-md) 0;
    color: var(--text-primary);
}

.post-footer {
    border-top: 1px solid var(--border-light);
    padding-top: var(--spacing-lg);
    transition: border-color 0.3s ease;
}

.post-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-link {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    transition: var(--transition);
}

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

.nav-link.external::after {
    content: "↗";
    margin-left: var(--spacing-xs);
    font-size: var(--font-size-xs);
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--border-light);
    padding: var(--spacing-xl) var(--spacing-lg);
    transition: border-color 0.3s ease;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.footer-content p {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Loading states */
.photo-frame.loading {
    background: linear-gradient(90deg, var(--loading-bg) 25%, var(--loading-highlight) 50%, var(--loading-bg) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

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

/* Responsive design */
@media (max-width: 1024px) {
    .photo-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .content {
        padding: var(--spacing-2xl) var(--spacing-md) var(--spacing-xl);
    }
    
    .post-main {
        padding: var(--spacing-2xl) var(--spacing-md) var(--spacing-xl);
    }
    
    .photo-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
    
    .post-title {
        font-size: var(--font-size-2xl);
    }
    
    .intro-text {
        font-size: var(--font-size-base);
    }
    
    .post-navigation {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .photo-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .site-title {
        font-size: var(--font-size-base);
    }
    
    .post-title {
        font-size: var(--font-size-xl);
    }
}