/* Nexus Theme - A dark, tech-forward timeline theme */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-card: #1a1a24;
    --color-border: #2a2a3a;
    --color-text: #e0e0e8;
    --color-text-muted: #8888a0;
    --color-text-faint: #555566;
    --color-accent: #00d4ff;
    --color-accent-dim: #0099bb;
    --color-accent-glow: rgba(0, 212, 255, 0.3);
    --color-link: #00d4ff;
    --color-link-hover: #40e0ff;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --font-serif: 'Georgia', 'Times New Roman', serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;

    /* Layout */
    --max-width: 1200px;
    --content-width: 720px;
    --timeline-width: 900px;

    /* Effects */
    --transition: 0.2s ease;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --glow: 0 0 20px var(--color-accent-glow);
}

/* ============================================
   Base Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--spacing-md);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
}

p {
    margin: 0 0 var(--spacing-md);
}

/* ============================================
   Site Structure
   ============================================ */
.site-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-main {
    flex: 1;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* ============================================
   Header
   ============================================ */
.site-header {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.site-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

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

.site-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.02em;
}

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

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

.site-description {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

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

.site-nav .nav-link {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-sm) 0;
    position: relative;
}

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

.site-nav .nav-link:hover,
.site-nav .nav-link.nav-current {
    color: var(--color-accent);
}

.site-nav .nav-link:hover::after,
.site-nav .nav-link.nav-current::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    margin: 5px 0;
    transition: var(--transition);
}

/* ============================================
   Timeline Layout
   ============================================ */
.timeline-container {
    max-width: var(--timeline-width);
    margin: 0 auto;
}

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

.timeline-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.timeline-subtitle {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin: 0;
}

.timeline {
    position: relative;
    padding-left: 80px;
}

.timeline-line {
    position: absolute;
    left: 35px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-border));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    transform: translateX(20px);
    animation: fadeInLeft 0.5s ease forwards;
}

.timeline-item:nth-child(1) { animation-delay: 0.1s; }
.timeline-item:nth-child(2) { animation-delay: 0.2s; }
.timeline-item:nth-child(3) { animation-delay: 0.3s; }
.timeline-item:nth-child(4) { animation-delay: 0.4s; }
.timeline-item:nth-child(5) { animation-delay: 0.5s; }

@keyframes fadeInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.timeline-marker {
    position: absolute;
    left: -80px;
    top: 0;
    width: 70px;
    text-align: center;
}

.timeline-year {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-bg);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 3px;
    position: relative;
}

.timeline-year::after {
    content: '';
    position: absolute;
    right: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background: var(--color-accent);
    border-radius: 50%;
    box-shadow: var(--glow);
}

.timeline-content {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.timeline-content:hover {
    border-color: var(--color-accent-dim);
    box-shadow: var(--glow);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.timeline-image {
    display: block;
    margin-bottom: var(--spacing-md);
    border-radius: 6px;
    overflow: hidden;
}

.timeline-image img {
    width: 100%;
    transition: transform var(--transition);
}

.timeline-image:hover img {
    transform: scale(1.02);
}

.timeline-item-title {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-sm);
}

.timeline-item-title a {
    color: var(--color-text);
}

.timeline-item-title a:hover {
    color: var(--color-accent);
}

.timeline-excerpt {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.timeline-tags {
    margin-bottom: var(--spacing-md);
}

.timeline-tag {
    display: inline-block;
    background: var(--color-bg-secondary);
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 3px;
    border: 1px solid var(--color-border);
}

.read-more {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent);
}

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

/* ============================================
   Post Page
   ============================================ */
.post-full {
    max-width: var(--content-width);
    margin: 0 auto;
}

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

.post-meta {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.post-date {
    color: var(--color-accent);
}

.post-tag-divider {
    margin: 0 var(--spacing-sm);
}

.post-tag {
    color: var(--color-text-muted);
}

.post-tag:hover {
    color: var(--color-accent);
}

.post-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.post-excerpt {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    margin: 0;
}

.post-feature-image {
    margin: 0 0 var(--spacing-xl);
}

.post-feature-image img {
    width: 100%;
    border-radius: 8px;
}

.post-feature-image figcaption {
    text-align: center;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
}

/* Post Content */
.post-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.post-content h2 {
    font-size: 1.75rem;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.post-content h3 {
    font-size: 1.4rem;
    margin-top: var(--spacing-lg);
}

.post-content blockquote {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md) var(--spacing-lg);
    border-left: 3px solid var(--color-accent);
    background: var(--color-bg-secondary);
    font-style: italic;
    color: var(--color-text-muted);
}

.post-content pre {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: var(--spacing-lg);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.post-content code {
    font-family: var(--font-mono);
    background: var(--color-bg-secondary);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
}

.post-content pre code {
    background: none;
    padding: 0;
}

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

.post-content figcaption {
    text-align: center;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
}

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

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

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

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

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

.tags-label {
    color: var(--color-text-muted);
    margin-right: var(--spacing-sm);
}

.tag-link {
    display: inline-block;
    background: var(--color-bg-secondary);
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    margin: var(--spacing-xs);
    border-radius: 3px;
    border: 1px solid var(--color-border);
}

.tag-link:hover {
    border-color: var(--color-accent);
}

.post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.post-nav-prev,
.post-nav-next {
    display: block;
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    transition: border-color var(--transition);
}

.post-nav-prev:hover,
.post-nav-next:hover {
    border-color: var(--color-accent);
}

.post-nav-next {
    text-align: right;
}

.post-nav-label {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.post-nav-title {
    display: block;
    color: var(--color-text);
    font-weight: 500;
}

/* ============================================
   Page
   ============================================ */
.page-full {
    max-width: var(--content-width);
    margin: 0 auto;
}

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

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
}

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

/* ============================================
   Tag Page
   ============================================ */
.tag-container {
    max-width: var(--timeline-width);
    margin: 0 auto;
}

.tag-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.tag-title {
    font-size: 2rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.tag-description {
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto var(--spacing-sm);
}

.tag-count {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-faint);
    margin: 0;
}

/* ============================================
   Pagination
   ============================================ */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.pagination-newer,
.pagination-older {
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: border-color var(--transition), background var(--transition);
}

.pagination-newer:hover,
.pagination-older:hover {
    border-color: var(--color-accent);
    background: var(--color-bg-card);
}

.pagination-info {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

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

.error-code {
    font-size: 8rem;
    font-weight: 700;
    color: var(--color-accent);
    margin: 0;
    line-height: 1;
    text-shadow: var(--glow);
}

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

.error-link {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-accent);
    color: var(--color-bg);
    font-weight: 600;
    border-radius: 4px;
    transition: background var(--transition);
}

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

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

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    text-align: center;
}

.footer-bio {
    margin-bottom: var(--spacing-lg);
}

.footer-tagline {
    color: var(--color-text-muted);
    font-size: 1rem;
    margin: 0;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-links a {
    color: var(--color-accent);
    font-weight: 500;
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--color-text-faint);
    margin: 0;
}

.footer-copyright a {
    color: var(--color-text-muted);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 2.5rem;
    }

    .site-header {
        padding: var(--spacing-md);
    }

    .header-inner {
        flex-wrap: wrap;
    }

    .site-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        padding-top: var(--spacing-md);
    }

    .site-nav.active {
        display: flex;
    }

    .site-nav .nav-link {
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-toggle {
        display: block;
    }

    .timeline {
        padding-left: 0;
    }

    .timeline-line {
        display: none;
    }

    .timeline-marker {
        position: static;
        width: auto;
        text-align: left;
        margin-bottom: var(--spacing-sm);
    }

    .timeline-year::after {
        display: none;
    }

    .timeline-title {
        font-size: 2rem;
    }

    .post-title {
        font-size: 1.75rem;
    }

    .post-nav {
        grid-template-columns: 1fr;
    }

    .error-code {
        font-size: 5rem;
    }
}

@media (max-width: 480px) {
    .site-main {
        padding: var(--spacing-lg) var(--spacing-md);
    }

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

    .timeline-item-title {
        font-size: 1.2rem;
    }
}

/* ============================================
   Ghost-specific Styles
   ============================================ */
.kg-card {
    margin: var(--spacing-lg) 0;
}

.kg-image-card img {
    width: 100%;
}

.kg-width-wide {
    margin-left: calc(-1 * var(--spacing-lg));
    margin-right: calc(-1 * var(--spacing-lg));
}

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

.kg-gallery-card {
    display: flex;
    flex-direction: column;
}

.kg-gallery-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.kg-gallery-row {
    display: flex;
    gap: var(--spacing-sm);
    width: 100%;
}

.kg-gallery-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.kg-bookmark-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    overflow: hidden;
}

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

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

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

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

.kg-bookmark-metadata {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--color-text-faint);
}

.kg-bookmark-icon {
    width: 16px;
    height: 16px;
}

.kg-bookmark-thumbnail {
    width: 200px;
    min-height: 160px;
}

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

/* Embed cards */
.kg-embed-card {
    display: flex;
    justify-content: center;
}

.kg-embed-card iframe {
    max-width: 100%;
}

/* Video/Audio */
.kg-video-card,
.kg-audio-card {
    border-radius: 6px;
    overflow: hidden;
}