/* ============================================
   SERENE BLUE - A Clean Ghost Theme
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
    /* Colors - Light Blue Palette */
    --color-bg: #f0f7fc;
    --color-bg-alt: #e3f0f9;
    --color-primary: #2c7da0;
    --color-primary-dark: #1d5a73;
    --color-accent: #468faf;
    --color-text: #2a3d4d;
    --color-text-light: #5a7a8f;
    --color-text-muted: #8aa4b5;
    --color-border: #c9dce8;
    --color-white: #ffffff;
    --color-card: #ffffff;
    
    /* Typography */
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    
    /* Layout */
    --container-width: 1200px;
    --container-narrow: 720px;
    
    /* Transitions */
    --transition: 0.3s ease;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.75rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
}

/* ---------- Layout ---------- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ---------- Header ---------- */
.site-header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.site-logo img {
    max-height: 48px;
    width: auto;
}

.site-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

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

.site-nav ul {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.site-nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-light);
    padding: var(--spacing-xs) 0;
    position: relative;
}

.site-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition);
}

.site-nav a:hover {
    color: var(--color-primary);
}

.site-nav a:hover::after {
    width: 100%;
}

/* ---------- Main Content ---------- */
.site-main {
    min-height: calc(100vh - 200px);
    padding: var(--spacing-xl) 0;
}

/* ---------- Site Description (Homepage Hero) ---------- */
.site-description {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-lg);
}

.site-tagline {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-dark);
}

.site-description p {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ---------- Post Feed (Card Grid) ---------- */
.post-feed {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.post-card {
    background: var(--color-card);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(44, 125, 160, 0.08);
    transition: transform var(--transition), box-shadow var(--transition);
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(44, 125, 160, 0.15);
}

.post-card-image-link {
    display: block;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.post-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition);
}

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

.post-card-content {
    padding: var(--spacing-md);
}

.post-card-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    background: var(--color-bg-alt);
    padding: 4px 10px;
    border-radius: 4px;
    margin-bottom: var(--spacing-xs);
}

.post-card-title {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.post-card-title a {
    color: var(--color-text);
}

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

.post-card-excerpt {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

.post-card-meta {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ---------- Single Post ---------- */
.post-header {
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.post-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.post-title {
    font-size: 2.75rem;
    font-weight: 700;
    max-width: 900px;
    margin: 0 auto var(--spacing-md);
}

.post-excerpt {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto var(--spacing-md);
}

.post-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    color: var(--color-text-muted);
}

.post-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-weight: 500;
    color: var(--color-text);
}

.post-info {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
}

.post-feature-image {
    max-width: 1000px;
    margin: 0 auto var(--spacing-xl);
    border-radius: 12px;
    overflow: hidden;
}

.post-feature-image img {
    width: 100%;
}

.post-feature-image figcaption {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    padding: var(--spacing-sm);
}

/* ---------- Post Content (Ghost Editor Styles) ---------- */
.post-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.post-content h2 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.post-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

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

.post-content a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.post-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--color-text-light);
}

.post-content pre {
    background: var(--color-text);
    color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

.post-content code {
    font-family: 'SF Mono', Consolas, monospace;
    font-size: 0.9em;
}

.post-content ul, .post-content ol {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-md);
}

.post-content li {
    margin-bottom: var(--spacing-xs);
}

.post-content figure {
    margin: var(--spacing-lg) 0;
}

.post-content figcaption {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.post-content hr {
    border: none;
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-xl) 0;
}

/* ---------- Post Footer ---------- */
.post-footer {
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.post-tags .tag {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-light);
    background: var(--color-bg-alt);
    padding: 6px 14px;
    border-radius: 20px;
    transition: all var(--transition);
}

.post-tags .tag:hover {
    color: var(--color-white);
    background: var(--color-primary);
}

/* ---------- Page Styles ---------- */
.page-header {
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.page-title {
    font-size: 2.75rem;
}

.page-feature-image {
    max-width: 1000px;
    margin: 0 auto var(--spacing-xl);
    border-radius: 12px;
    overflow: hidden;
}

.page-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.page-excerpt {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-sm);
}

.page-feature-image figcaption {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    padding: var(--spacing-sm);
}

.page-footer {
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.page-updated {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* ---------- Archive Pages ---------- */
.archive-header {
    text-align: center;
    padding: var(--spacing-lg) 0 var(--spacing-xl);
}

.archive-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

.archive-description {
    font-size: 1.1rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto var(--spacing-sm);
}

.archive-count {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.author-header {
    padding-bottom: var(--spacing-lg);
}

.author-profile-image {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto var(--spacing-md);
    border: 4px solid var(--color-white);
    box-shadow: 0 4px 15px rgba(44, 125, 160, 0.15);
}

/* ---------- Pagination ---------- */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) 0;
}

.pagination a {
    font-weight: 500;
    color: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-primary);
    border-radius: 8px;
    transition: all var(--transition);
}

.pagination a:hover {
    color: var(--color-white);
    background: var(--color-primary);
}

.page-number {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ---------- Error Page ---------- */
.error-content {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.error-code {
    font-size: 8rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.error-message {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.error-link {
    display: inline-block;
    font-weight: 500;
    color: var(--color-white);
    background: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    transition: background var(--transition);
}

.error-link:hover {
    color: var(--color-white);
    background: var(--color-primary-dark);
}

/* ---------- Footer ---------- */
.site-footer {
    background: var(--color-white);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-inner a {
    color: var(--color-primary);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .header-inner {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .site-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .post-feed {
        grid-template-columns: 1fr;
    }
    
    .post-title, .page-title, .archive-title {
        font-size: 2rem;
    }
    
    .site-tagline {
        font-size: 2.25rem;
    }
    
    .post-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .footer-inner {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
    
    .error-code {
        font-size: 5rem;
    }
}

/* ---------- Ghost-specific classes ---------- */
.kg-image-card img,
.kg-gallery-image img {
    border-radius: 8px;
}

.kg-width-wide {
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.kg-width-full {
    max-width: 100vw;
    margin-left: calc(-50vw + 50%);
    margin-right: calc(-50vw + 50%);
}

.kg-bookmark-card {
    background: var(--color-bg-alt);
    border-radius: 8px;
    overflow: hidden;
}

.kg-bookmark-container {
    display: flex;
    text-decoration: none;
}

.kg-bookmark-content {
    padding: var(--spacing-md);
    flex: 1;
}

.kg-bookmark-title {
    font-weight: 600;
    color: var(--color-text);
}

.kg-bookmark-description {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-xs);
}

.kg-bookmark-thumbnail {
    width: 200px;
}

.kg-bookmark-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}