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

:root {
    --bg: #0b0f19;
    --bg-surface: #111827;
    --bg-surface-hover: #1a2236;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --text-subtle: #64748b;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-soft: rgba(99, 102, 241, 0.12);
    --border: #1e293b;
    --border-hover: #334155;
    --code-bg: #0f172a;
    --radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg);
    min-height: 100vh;
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
}

.container {
    max-width: 760px;
    margin: 0 auto;
    padding: 1rem 1.5rem 1rem;
}

/* ── Header / Nav ── */
header {
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

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

.nav-brand {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-muted);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color 0.2s;
}

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

.nav-brand.active {
    color: var(--accent-hover);
}

.nav-links {
    display: flex;
    gap: 1.75rem;
}

nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

nav a:hover,
nav a.active {
    color: var(--accent-hover);
}

/* ── Hero ── */
.hero {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    padding: 1.5rem 0 3.5rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1rem;
}

.hero-image {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-hover);
    outline: 4px solid var(--accent-soft);
    flex-shrink: 0;
}

.hero-content {
    flex: 1;
    min-width: 0;
}

.hero-name {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 0.5rem;
    color: var(--text);
    letter-spacing: -0.02em;
}

.hero-tagline {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.hero-social {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 1rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-hover);
    border-radius: var(--radius);
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.social-link:hover {
    background-color: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent-hover);
    text-decoration: none;
}

.social-link svg {
    flex-shrink: 0;
}

/* ── Posts Section (homepage) ── */
.posts-section {
    margin-bottom: 1.5rem;
}

.posts-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-subtle);
    margin-bottom: 2rem;
}

/* ── Post List Header (all posts page) ── */
.posts-header {
    margin-bottom: 3rem;
}

.posts-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.4rem;
    letter-spacing: -0.02em;
}

.posts-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ── Year / Month Groups ── */
.year-group {
    margin-bottom: 3rem;
}

.year-group h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-subtle);
    margin-top: 0;
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.month-group {
    margin-bottom: 1.75rem;
}

.month-group h3 {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-subtle);
    margin-top: 0;
    margin-bottom: 1rem;
}

/* ── Post Item ── */
.post-item {
    padding: 1.25rem 1.25rem 1.25rem 1rem;
    margin-bottom: 0.5rem;
    border-radius: var(--radius);
    border: 1px solid transparent;
    transition: background 0.2s, border-color 0.2s;
    position: relative;
}

.post-item:hover {
    background-color: var(--bg-surface);
    border-color: var(--border);
}

.post-item-meta {
    margin-bottom: 0.25rem;
}

.post-item-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 0.4rem;
    line-height: 1.3;
}

.post-item-title a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Fallback for list pages using h4 */
.post-item h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 0.4rem;
}

.post-item h4 a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.2s;
}

.post-item h4 a:hover {
    color: var(--accent-hover);
}

.post-meta {
    font-size: 0.8rem;
    color: var(--text-subtle);
    margin-bottom: 0.4rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.post-excerpt {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin: 0;
}

/* ── All Posts Button ── */
.all-posts-link {
    margin-top: 2.5rem;
    text-align: center;
}

.all-posts-button {
    display: inline-block;
    padding: 0.6rem 1.4rem;
    background-color: transparent;
    border: 1px solid var(--border-hover);
    border-radius: var(--radius);
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.all-posts-button:hover {
    background-color: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent-hover);
    text-decoration: none;
}

/* ── Typography ── */
h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 2.5rem;
    margin-bottom: 0.75rem;
    color: var(--text);
    line-height: 1.3;
}

h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.6rem;
    color: var(--text);
}

h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

p {
    margin-bottom: 1rem;
    color: var(--text-muted);
}

a {
    color: var(--accent-hover);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ── Single Post ── */
.post {
    margin-bottom: 3rem;
}

.post-header {
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.post-header h1 {
    font-size: 2.1rem;
    margin-bottom: 0.75rem;
    line-height: 1.2;
}

.post-header .post-meta {
    font-size: 0.85rem;
}

.post-description {
    margin-top: 1rem;
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.6;
    padding: 0.75rem 1rem;
    border-left: 3px solid var(--accent);
    background-color: var(--accent-soft);
    border-radius: 0 var(--radius) var(--radius) 0;
}

.post-content {
    font-size: 1rem;
    line-height: 1.75;
}

.post-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.4rem;
}

.post-content h3 {
    margin-top: 2rem;
    margin-bottom: 0.6rem;
    font-size: 1.15rem;
}

.post-content p {
    margin-bottom: 1.25rem;
    color: var(--text-muted);
}

.post-content ul,
.post-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.75rem;
    color: var(--text-muted);
}

.post-content li {
    margin-bottom: 0.4rem;
}

.post-content code {
    background-color: var(--code-bg);
    border: 1px solid var(--border-hover);
    border-radius: 4px;
    padding: 0.15em 0.4em;
    font-size: 0.875em;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    color: var(--text);
}

.post-content pre {
    background-color: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.post-content pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.875rem;
}

/* Chroma syntax highlighting integration */
.post-content .highlight {
    background-color: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.post-content .highlight .chroma {
    background-color: transparent;
    padding: 0;
    margin: 0;
    border: none;
    border-radius: 0;
}

.post-content .highlight pre {
    background-color: transparent;
    border: none;
    padding: 0;
    margin: 0;
    overflow: visible;
}

.post-content .highlight code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.875rem;
}

.post-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1.25rem;
    margin-left: 0;
    margin-bottom: 1.25rem;
    color: var(--text-muted);
    font-style: italic;
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin: 1.5rem 0;
    border: 1px solid var(--border);
}

.post-content a {
    color: var(--accent-hover);
    text-decoration: underline;
}

.post-content a:hover {
    color: var(--text);
}

/* ── Post Navigation ── */
.post-navigation {
    display: flex;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.post-nav-link {
    flex: 1 1 0;
    min-width: 0;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-hover);
    border-radius: var(--radius);
    text-decoration: none;
    transition: all 0.2s ease;
}

.post-nav-link:hover {
    background-color: var(--accent-soft);
    border-color: var(--accent);
    text-decoration: none;
}

.post-nav-link.post-nav-empty {
    flex: 1 1 0;
    min-width: 0;
    background-color: transparent;
    border-color: transparent;
    cursor: default;
    pointer-events: none;
}

.post-nav-direction {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-subtle);
    margin-bottom: 0.5rem;
}

.post-nav-link:hover .post-nav-direction {
    color: var(--accent-hover);
}

.post-nav-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.4;
}

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

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

.post-nav-prev {
    text-align: left;
    align-items: flex-start;
}

/* ── Footer ── */
footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.footer-social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.75rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-hover);
    border-radius: var(--radius);
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.footer-social-link:hover {
    background-color: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent-hover);
    text-decoration: none;
}

.footer-social-link svg {
    flex-shrink: 0;
}

footer p {
    color: var(--text-subtle);
    font-size: 0.825rem;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .container {
        padding: 1.5rem 1rem;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
        padding: 2rem 0 2.5rem;
    }

    .hero-image {
        width: 110px;
        height: 110px;
    }

    .hero-name {
        font-size: 2rem;
    }

    .hero-social {
        justify-content: center;
    }

    h1 {
        font-size: 1.85rem;
    }

    .post-header h1 {
        font-size: 1.65rem;
    }

    .posts-header h1 {
        font-size: 1.65rem;
    }

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

    .post-nav-link {
        padding: 0.875rem;
    }

    .post-nav-title {
        font-size: 0.9rem;
    }
}