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

:root {
    /* Colors from logo */
    --color-green: #00b80d;
    --color-green-light: #abffb1;
    --color-blue: #0039c8;
    --color-blue-light: #abc3ff;
    --color-red: #cd0000;
    --color-red-light: #ffabab;

    /* Gray foundation */
    --color-gray-primary: #95a5b6;
    --color-gray-dark: #084a82;
    --color-gray-light: #f8f9fa;
    --color-gray-medium: #e9ecef;
    --color-gray-border: #dee2e6;

    /* Text colors */
    --color-text-primary: #343a40;
    --color-text-secondary: #6c757d;
    --color-text-light: #ffffff;

    /* Fonts */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', Monaco, Inconsolata, 'Roboto Mono', 'Droid Sans Mono', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;

    /* Border radius */
    --border-radius: 8px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-gray-light);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--color-gray-light) 0%, var(--color-gray-medium) 100%);
    border-bottom: 1px solid var(--color-gray-border);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-sm);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: inherit;
    transition: opacity 0.3s ease;
}

.logo-link:hover {
    opacity: 0.8;
}

.logo {
    width: 65px;
    height: 65px;
    filter: drop-shadow(var(--shadow-sm));
}

.brand {
    display: flex;
    flex-direction: column;
}

.site-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-gray-dark);
    margin: 0;
    line-height: 1.2;
}

.tagline {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 400;
    margin: 0;
    font-style: italic;
}

/* Navigation */
.nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    position: relative;
    cursor: pointer;
}

.nav-link.active {
    background-color: var(--color-gray-dark);
    color: white;
}

.nav-green:hover {
    background-color: var(--color-green-light);
    color: var(--color-green);
}

.nav-blue:hover {
    background-color: var(--color-blue-light);
    color: var(--color-blue);
}

.nav-red:hover {
    background-color: var(--color-red-light);
    color: var(--color-red);
}

/* Hero section */
.hero {
    background: linear-gradient(135deg, var(--color-gray-light) 0%, white 100%);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-dark);
}

.highlight-green {
    color: var(--color-green);
}

.highlight-blue {
    color: var(--color-blue);
}

.highlight-red {
    color: var(--color-red);
}

.hero-description {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.7;
}

.color-guide {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.color-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.color-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
}

.color-dot.green {
    background: linear-gradient(135deg, var(--color-green) 0%, var(--color-green-light) 100%);
}

.color-dot.blue {
    background: linear-gradient(135deg, var(--color-blue) 0%, var(--color-blue-light) 100%);
}

.color-dot.red {
    background: linear-gradient(135deg, var(--color-red) 0%, var(--color-red-light) 100%);
}

/* Blog section */
.blog-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-gray-light);
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-gray-dark);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.posts-section-title {
    grid-column: 1 / -1;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-gray-dark);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-gray-border);
}

.posts-section-title:first-child {
    margin-top: 0;
}

/* Post cards */
.post-card {
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 4px solid var(--color-gray-border);
    display: flex;
    flex-direction: column;
}

.post-card.learning {
    border-left-color: var(--color-green);
}

.post-card.technical {
    border-left-color: var(--color-blue);
}

.post-card.updates {
    border-left-color: var(--color-red);
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.post-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
}

.post-category {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 4px 8px;
    border-radius: var(--border-radius);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.post-category.green {
    color: var(--color-green);
    background: rgba(171, 255, 177, 0.2);
}

.post-category.blue {
    color: var(--color-blue);
    background: rgba(171, 195, 255, 0.2);
}

.post-category.red {
    color: var(--color-red);
    background: rgba(255, 171, 171, 0.2);
}

.category-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.category-dot.green {
    background: var(--color-green);
}

.category-dot.blue {
    background: var(--color-blue);
}

.category-dot.red {
    background: var(--color-red);
}

.post-date {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.post-title-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.post-title-link:hover {
    text-decoration: none;
}

.post-title-link:hover .post-title {
    color: var(--color-red);
}

.post-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-gray-dark);
    margin: 0 var(--spacing-md) var(--spacing-sm);
    line-height: 1.3;
    transition: color 0.2s ease;
}

.post-excerpt {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin: 0 var(--spacing-md) var(--spacing-md);
    flex-grow: 1;
}

.post-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
    border-top: 1px solid var(--color-gray-border);
    margin-top: auto;
}

.post-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.post-read-time {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-weight: 400;
}

.green-link {
    color: var(--color-green);
    border: 1px solid var(--color-green);
}

.green-link:hover {
    background-color: var(--color-green);
    color: white;
}

.blue-link {
    color: var(--color-blue);
    border: 1px solid var(--color-blue);
}

.blue-link:hover {
    background-color: var(--color-blue);
    color: white;
}

.red-link {
    color: var(--color-red);
    border: 1px solid var(--color-red);
}

.red-link:hover {
    background-color: var(--color-red);
    color: white;
}

/* Footer */
.footer {
    background-color: var(--color-gray-dark);
    color: var(--color-text-light);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
    text-align: center;
}

.footer-text {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

/* Responsive design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-description {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .color-guide {
        gap: var(--spacing-sm);
    }

    .nav {
        gap: var(--spacing-sm);
    }

    .nav-link {
        padding: var(--spacing-xs);
        font-size: 0.9rem;
    }

    .header .container {
        flex-direction: column;
        text-align: center;
    }

    .posts-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .logo {
        width: 55px;
        height: 55px;
    }

    .site-title {
        font-size: 1.6rem;
    }

    .post-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }

    .post-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .color-guide {
        flex-direction: column;
        align-items: center;
    }

    .section-header {
        flex-direction: column;
        text-align: center;
    }

    .section-title {
        font-size: 1.4rem;
    }
}
/* Blog post images - responsive sizing */
.post-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.5rem 0;
}