/* CSS Variables for themes */
:root {
    --bg-color: #fafafa;
    --text-color: #333;
    --card-bg: rgba(255, 255, 255, 0.95);
    --header-bg: white;
    --border-color: #e0e0e0;
    --meta-color: #7f8c8d;
    --link-color: #3498db;
    --link-hover: #2980b9;
    --footer-bg: #2c3e50;
    --footer-text: white;
    --excerpt-color: #555;
    --content-text: #444;
    --blockquote-color: #666;
    --code-bg: #f8f9fa;
    --shadow: rgba(0,0,0,0.1);
    --shadow-hover: rgba(0,0,0,0.15);
}

/* Dark mode variables */
body:has(.theme-switch:checked) {
    --bg-color: #1a1a1a;
    --text-color: #e4e4e4;
    --card-bg: rgba(45, 45, 45, 0.95);
    --header-bg: #2d2d2d;
    --border-color: #404040;
    --meta-color: #a0a0a0;
    --link-color: #5dade2;
    --link-hover: #3498db;
    --footer-bg: #1a1a1a;
    --footer-text: #e4e4e4;
    --excerpt-color: #b0b0b0;
    --content-text: #d0d0d0;
    --blockquote-color: #a0a0a0;
    --code-bg: #3a3a3a;
    --shadow: rgba(0,0,0,0.3);
    --shadow-hover: rgba(0,0,0,0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Georgia', serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    background-image: url('brick-pattern.svg');
    background-size: 32px 20px;
    background-repeat: repeat;
    background-attachment: fixed;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Make content areas slightly more opaque to improve readability */
.post-card,
.post-content,
header {
    background: var(--card-bg);
    backdrop-filter: blur(1px);
    transition: background-color 0.3s ease;
}

.container {
    max-width: 90vw;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

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

.logo {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--text-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: color 0.3s ease;
}

.logo-image {
    width: auto;
    height: 60px;
    margin-right: 8px;
    object-fit: contain;
    border-radius: 4px;
}

.logo-image-only {
    width: auto;
    height: 64px;
    object-fit: contain;
    border-radius: 4px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

nav a {
    text-decoration: none;
    color: var(--meta-color);
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

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

/* Theme Toggle Styles */
.theme-toggle {
    margin-left: 1rem;
}

.theme-switch {
    display: none;
}

.theme-label {
    display: block;
    width: 50px;
    height: 26px;
    background: var(--border-color);
    border-radius: 26px;
    position: relative;
    cursor: pointer;
    transition: background 0.3s ease;
}

.theme-slider {
    display: block;
    width: 22px;
    height: 22px;
    background: var(--card-bg);
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: transform 0.3s ease, background 0.3s ease;
    box-shadow: 0 2px 4px var(--shadow);
}

.theme-slider::before {
    content: '☀️';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
    transition: opacity 0.3s ease;
}

/* When toggle is checked (dark mode) */
.theme-switch:checked + .theme-label {
    background: #4a5568;
}

.theme-switch:checked + .theme-label .theme-slider {
    transform: translateX(24px);
}

.theme-switch:checked + .theme-label .theme-slider::before {
    content: '🌙';
}

/* Breadcrumb Styles */
.breadcrumb {
    padding: 0.75rem 0;
    color: var(--meta-color);
    font-size: 0.85rem;
    transition: color 0.3s ease;
}

.breadcrumb a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Main Content */
main {
    padding: 2rem 0;
}

.page-title {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--text-color);
    font-weight: normal;
    transition: color 0.3s ease;
}

/* Homepage Post Grid */
.posts-grid {
    display: grid;
    gap: 1.5rem;
}

.post-card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.0rem;
    box-shadow: 0 2px 10px var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
}

.post-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px var(--shadow-hover);
}

.post-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    line-height: 1.3;
    transition: color 0.3s ease;
}

.post-title a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

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

.post-meta {
    color: var(--meta-color);
    font-size: 0.85rem;
    transition: color 0.3s ease;
}

.post-excerpt {
    color: var(--excerpt-color);
    line-height: 1.6;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.read-more {
    display: inline-block;
    margin-top: 0.75rem;
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: var(--link-hover);
}

/* Individual Post Page Styles */
.post-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    transition: border-color 0.3s ease;
}

.post-header .post-title {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
    line-height: 1.2;
    font-weight: normal;
    transition: color 0.3s ease;
}

.post-header .post-meta {
    color: var(--meta-color);
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.post-content {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px var(--shadow);
    margin-bottom: 2rem;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.post-content h2 {
    color: var(--text-color);
    margin: 1.5rem 0 0.75rem;
    font-size: 1.3rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

.post-content h3 {
    color: var(--text-color);
    margin: 1.25rem 0 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

.post-content p {
    margin-bottom: 1.25rem;
    line-height: 1.7;
    color: var(--content-text);
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.post-content code {
    background: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: #e74c3c;
    transition: background-color 0.3s ease;
}

.post-content blockquote {
    border-left: 4px solid var(--link-color);
    padding-left: 1.25rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--blockquote-color);
    font-size: 0.95rem;
    transition: color 0.3s ease, border-color 0.3s ease;
}

/* Post Navigation */
.post-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border-color);
    transition: border-color 0.3s ease;
}

.nav-link {
    color: var(--link-color);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--link-color);
    border-radius: 4px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.nav-link:hover {
    background: var(--link-color);
    color: var(--header-bg);
}

.back-to-blog {
    color: var(--meta-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.back-to-blog:hover {
    color: var(--text-color);
}

/* Footer */
footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 1.0rem 0;
    margin-top: 3rem;
    font-size: 0.9rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 0.75rem;
    }

    nav ul {
        gap: 1rem;
    }

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

    .post-header .post-title {
        font-size: 1.6rem;
    }

    .post-content {
        padding: 1.5rem;
    }

    .post-navigation {
        flex-direction: column;
        gap: 0.75rem;
    }

    main {
        padding: 1.5rem 0;
    }

    .container {
        padding: 0 15px;
    }

    .post-card {
        padding: 1.25rem;
    }

    .theme-toggle {
        margin-left: 0;
    }
}