:root {
    --color-bg: #fafaf9;
    --color-bg-alt: #f5f5f4;
    --color-text: #1c1917;
    --color-text-secondary: #57534e;
    --color-text-muted: #a8a29e;
    --color-accent: #0c0a09;
    --color-accent-hover: #292524;
    --color-border: #e7e5e4;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
    --shadow-hover: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
}

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    background: rgba(250, 250, 249, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.nav-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 56px;
}

.nav-logo {
    font-weight: 700;
    font-size: 18px;
    letter-spacing: -0.5px;
    color: var(--color-text);
    text-decoration: none;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    margin-left: 28px;
    transition: color 0.2s;
}

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

/* Hero */
.hero {
    padding: 120px 24px 64px;
    max-width: 720px;
    margin: 0 auto;
}

.hero-container {
    display: flex;
    gap: 48px;
    align-items: flex-start;
}

.hero-subtitle {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -1.5px;
    line-height: 1.1;
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 480px;
}

.hero-actions {
    display: flex;
    gap: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
}

.btn-secondary {
    background: var(--color-bg-alt);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-border);
}

.hero-meta {
    min-width: 200px;
    padding-top: 8px;
}

.meta-item {
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.meta-item:last-child {
    border-bottom: none;
}

.meta-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.meta-value {
    font-size: 14px;
    color: var(--color-text);
    font-weight: 500;
}

/* Sections */
.section {
    padding: 64px 24px;
}

.section-alt {
    background: var(--color-bg-alt);
}

.container {
    max-width: 720px;
    margin: 0 auto;
}

.section-title {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin-bottom: 32px;
}

/* Post Cards */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.post-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
    transition: box-shadow 0.3s, transform 0.2s;
}

.post-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.post-date {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.post-title a {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    line-height: 1.4;
}

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

.post-excerpt {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-top: 10px;
    line-height: 1.7;
}

.post-tags {
    margin-top: 14px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    font-size: 11px;
    font-weight: 500;
    padding: 4px 10px;
    background: var(--color-bg-alt);
    border-radius: 100px;
    color: var(--color-text-secondary);
}

.section-footer {
    margin-top: 28px;
}

.link-arrow {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
}

.link-arrow:hover {
    text-decoration: underline;
}

/* Contributions */
.contrib-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contrib-item {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
}

.contrib-project {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.contrib-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

/* Footer */
.footer {
    border-top: 1px solid var(--color-border);
    padding: 32px 24px;
    background: var(--color-bg-alt);
}

.footer-container {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--color-text-muted);
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    margin-left: 20px;
    font-size: 13px;
}

.footer-links a:hover {
    color: var(--color-text);
}

/* Resume Page */
.resume-page {
    padding: 96px 24px 64px;
    max-width: 720px;
    margin: 0 auto;
}

.resume-header {
    text-align: center;
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 2px solid var(--color-text);
}

.resume-header h1 {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 16px;
}

.resume-contact {
    display: flex;
    justify-content: center;
    gap: 24px;
    font-size: 14px;
    color: var(--color-text-secondary);
    flex-wrap: wrap;
}

.resume-section {
    margin-bottom: 40px;
}

.resume-section h2 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
    margin-bottom: 20px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
}

.resume-item {
    margin-bottom: 28px;
}

.resume-item-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 8px;
}

.resume-item-title {
    font-weight: 600;
    font-size: 15px;
}

.resume-item-date {
    font-size: 13px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.resume-item ul {
    margin-left: 18px;
    color: var(--color-text-secondary);
    font-size: 14px;
    line-height: 1.8;
}

.resume-item li {
    margin-bottom: 6px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.skill-group {
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    padding: 20px;
}

.skill-group h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.skill-group p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.resume-footer {
    text-align: center;
    padding: 32px 0;
}

/* Article */
.article-page {
    padding: 96px 24px 64px;
    max-width: 680px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 40px;
}

.article-header h1 {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.3;
    margin-bottom: 12px;
}

.article-meta {
    font-size: 13px;
    color: var(--color-text-muted);
}

.article-content {
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-text);
}

.article-content h2 {
    font-size: 20px;
    font-weight: 600;
    margin: 40px 0 16px;
    letter-spacing: -0.3px;
}

.article-content h3 {
    font-size: 17px;
    font-weight: 600;
    margin: 28px 0 12px;
}

.article-content p {
    margin-bottom: 16px;
}

.article-content ul, .article-content ol {
    margin: 0 0 16px 20px;
}

.article-content li {
    margin-bottom: 6px;
}

.article-content code {
    font-family: var(--font-mono);
    font-size: 13px;
    background: var(--color-bg-alt);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--color-accent);
}

.article-content pre {
    background: var(--color-accent);
    color: #e7e5e4;
    padding: 16px 20px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin-bottom: 20px;
    font-size: 13px;
    line-height: 1.6;
}

.article-content pre code {
    background: none;
    color: inherit;
    padding: 0;
}

/* Responsive */
@media (max-width: 640px) {
    .hero-container {
        flex-direction: column;
    }
    .hero-meta {
        min-width: auto;
        padding-top: 0;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
    .hero-title { font-size: 36px; }
    .hero { padding-top: 96px; }
    .skills-grid { grid-template-columns: 1fr; }
    .resume-contact { flex-direction: column; gap: 8px; }
    .resume-item-header { flex-direction: column; }
}