:root {
    /* Light Mode */
    --bg-main: #ffffff;
    --text-main: #1a1a1a;
    --text-muted: #666666;
    --border-main: #000000;
    
    --dead-bg: #ffffff;
    --dead-accent: #ff4757;
    --dead-text: #1a1a1a;
    
    --alive-bg: #f1f2f6;
    --alive-accent: #2ed573;
    --alive-text: #1a1a1a;
    
    --font-heading: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-body: Georgia, serif;
    
    --transition: 0.3s ease;
}

[data-theme="dark"] {
    /* Dark Mode */
    --bg-main: #121212;
    --text-main: #f1f2f6;
    --text-muted: #a4b0be;
    --border-main: #f1f2f6;
    
    --dead-bg: #1e1e1e;
    --dead-accent: #ff6b81;
    --dead-text: #f1f2f6;
    
    --alive-bg: #222222;
    --alive-accent: #7bed9f;
    --alive-text: #f1f2f6;
}

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

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-main);
    transition: background-color var(--transition), color var(--transition);
}

/* Theme Toggle Button Style */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--border-main);
    color: var(--bg-main);
    border: none;
    padding: 10px 15px;
    font-family: var(--font-heading);
    font-weight: 900;
    text-transform: uppercase;
    cursor: pointer;
    z-index: 1000;
    font-size: 0.7rem;
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -0.02em;
    transition: color var(--transition);
}

a {
    color: inherit;
    text-decoration: none;
}

/* Layout Containers */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-full {
    width: 100%;
}

/* Header Styles (Minimal/Brutalist) */
header {
    border-bottom: 4px solid var(--border-main);
    padding: 40px 0;
    text-align: center;
    transition: border-bottom var(--transition);
}

.site-branding h1 {
    font-size: 3rem;
    line-height: 1;
}

.site-branding p {
    font-size: 1rem;
    font-family: var(--font-heading);
    margin-top: 10px;
    color: var(--text-muted);
}

nav {
    margin-top: 20px;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 30px;
}

nav ul li a {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.9rem;
    border-bottom: 2px solid transparent;
}

nav ul li a:hover {
    border-bottom: 2px solid var(--border-main);
}

/* Timeline Layout (Home) */
.timeline-container {
    position: relative;
    padding: 80px 0;
    min-height: 80vh;
    background: linear-gradient(to right, var(--dead-bg) 50%, var(--alive-bg) 50%);
    overflow: hidden;
}

.timeline-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--border-main);
    transform: translateX(-50%);
    z-index: 1;
}

.timeline-posts {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    z-index: 2;
}

.timeline-item {
    position: relative;
    width: 50%;
    padding: 20px 60px;
    margin-bottom: 40px;
}

.timeline-marker {
    position: absolute;
    top: 30px;
    width: 20px;
    height: 20px;
    background-color: var(--border-main);
    border: 4px solid var(--bg-main);
    border-radius: 50%;
    z-index: 3;
}

.item-dead {
    left: 0;
    text-align: right;
}

.item-dead .timeline-marker {
    right: -12px;
}

.item-alive {
    left: 50%;
    text-align: left;
}

.item-alive .timeline-marker {
    left: -12px;
}

.item-dead .post-block {
    background-color: var(--dead-bg);
    color: var(--dead-text);
}

.item-alive .post-block {
    background-color: var(--alive-bg);
    color: var(--alive-text);
}

.timeline-item .post-block {
    padding: 30px;
    border: 4px solid var(--border-main);
    transition: transform var(--transition);
}

.timeline-item .post-block:hover {
    transform: translateY(-5px);
}

.post-category {
    display: inline-block;
    padding: 2px 8px;
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
    color: #fff;
    margin-left: 10px;
}

.item-dead .post-category { background-color: var(--dead-accent); }
.item-alive .post-category { background-color: var(--alive-accent); }

/* Timeline Footer */
.timeline-footer {
    text-align: center;
    padding: 60px 0;
    border-top: 4px solid var(--border-main);
}

.view-all-btn {
    font-family: var(--font-heading);
    font-weight: 900;
    text-transform: uppercase;
    padding: 15px 30px;
    background: var(--border-main);
    color: var(--bg-main);
    display: inline-block;
}

/* Blog Archive */
.blog-archive {
    padding-bottom: 80px;
}

.archive-intro {
    font-size: 1.2rem;
    margin-bottom: 40px;
    color: var(--text-muted);
}

.archive-list {
    list-style: none;
}

.archive-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--text-muted);
    display: flex;
    align-items: center;
    gap: 20px;
}

.archive-date {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-muted);
    min-width: 120px;
}

.archive-category {
    padding: 2px 8px;
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
    color: #fff;
    min-width: 80px;
    text-align: center;
}

.badge-dead { background-color: var(--dead-accent); }
.badge-alive { background-color: var(--alive-accent); }

.archive-link {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.2rem;
}

.archive-link:hover {
    color: var(--dead-accent);
}

/* Mobile Timeline Responsive */
@media (max-width: 900px) {
    .timeline-container {
        background: var(--bg-main);
    }
    
    .timeline-line {
        left: 30px;
    }
    
    .timeline-item {
        width: 100%;
        left: 0;
        padding-left: 60px;
        padding-right: 20px;
        text-align: left;
    }
    
    .timeline-marker {
        left: 18px !important;
    }

    .archive-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
}

/* Individual Post Layout */
.post-header h1 {
    font-size: 3.5rem;
    line-height: 1;
    margin-bottom: 20px;
}

.post-content {
    font-size: 1.25rem;
    max-width: 800px;
}

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content blockquote {
    border-left: 8px solid var(--border-main);
    padding-left: 30px;
    margin: 40px 0;
    font-style: italic;
    font-size: 1.5rem;
}

/* Page Layout (Full Width) */
.page-wrapper {
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 0;
}

/* Footer */
footer {
    border-top: 4px solid var(--border-main);
    padding: 60px 0;
    text-align: center;
    background: var(--bg-main);
    transition: border-top var(--transition), background var(--transition);
}

footer p {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    margin-bottom: 10px;
    color: var(--text-muted);
}

/* Mobile Responsive */
@media (max-width: 900px) {
    .split-layout {
        grid-template-columns: 1fr;
    }
    
    .column-dead {
        border-right: none;
        border-bottom: 4px solid var(--border-main);
    }
    
    .main-wrapper {
        grid-template-columns: 1fr;
    }

    aside {
        border-left: none;
        border-top: 4px solid var(--border-main);
        padding-left: 0;
        padding-top: 40px;
    }

    .post-header h1 {
        font-size: 2.5rem;
    }
}