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

:root {
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F9F9F9;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-border: #E5E5E5;
    --color-accent: #0F6E56;
    --color-accent-light: #E1F5EE;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0D0D0D;
        --color-bg-secondary: #1A1A1A;
        --color-text-primary: #F5F5F5;
        --color-text-secondary: #A3A3A3;
        --color-text-tertiary: #737373;
        --color-border: #2A2A2A;
        --color-accent: #1D9E75;
        --color-accent-light: #0F6E56;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
nav {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

@media (prefers-color-scheme: dark) {
    nav {
        background: rgba(13, 13, 13, 0.95);
    }
}

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

nav .logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
}

nav ul {
    display: flex;
    gap: 32px;
    list-style: none;
}

nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.2s;
}

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

/* Typography */
h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
}

h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 40px;
}

h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
}

h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

/* Sections */
section {
    padding: 80px 0;
}

/* Hero */
.hero {
    padding: 120px 0 100px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    max-width: 800px;
    line-height: 1.7;
}

.hero-meta {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    font-size: 15px;
    color: var(--color-text-secondary);
}

.hero-meta a {
    color: var(--color-accent);
    text-decoration: none;
}

.hero-meta a:hover {
    text-decoration: underline;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -36px;
    top: 8px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 2px solid var(--color-bg);
}

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

.timeline-title {
    font-size: 20px;
    font-weight: 600;
}

.timeline-period {
    font-size: 14px;
    color: var(--color-text-tertiary);
}

.timeline-company {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.timeline-description {
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

/* Metrics */
.metrics {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.metric {
    background: var(--color-bg-secondary);
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.metric-value {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-accent);
}

.metric-label {
    font-size: 13px;
    color: var(--color-text-tertiary);
}

/* Portfolio */
.philosophy-box {
    background: var(--color-accent-light);
    padding: 32px;
    border-radius: 12px;
    margin-bottom: 48px;
    border-left: 4px solid var(--color-accent);
}

.philosophy-box p {
    color: var(--color-text-primary);
    font-size: 16px;
    line-height: 1.7;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.portfolio-item {
    background: var(--color-bg-secondary);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: all 0.2s;
}

.portfolio-item:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent);
}

.portfolio-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.portfolio-type {
    font-size: 14px;
    color: var(--color-text-tertiary);
    margin-bottom: 8px;
}

.portfolio-description {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Projects */
.project-card {
    background: var(--color-bg-secondary);
    padding: 32px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    margin-bottom: 32px;
}

.project-tag {
    display: inline-block;
    background: var(--color-accent-light);
    color: var(--color-accent);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 16px;
    font-weight: 500;
}

.project-description {
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.framework-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
}

.framework-item {
    background: var(--color-bg);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    border: 1px solid var(--color-border);
}

/* Blog Grid */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.blog-card {
    background: var(--color-bg-secondary);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-decoration: none;
    color: inherit;
    transition: all 0.2s;
    display: block;
}

.blog-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent);
}

.blog-category {
    font-size: 13px;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 8px;
}

.blog-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.blog-excerpt {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 8px;
}

.blog-date {
    font-size: 13px;
    color: var(--color-text-tertiary);
}

/* Blog Post Page */
.blog-post {
    max-width: 750px;
    margin: 0 auto;
    padding: 60px 24px;
}

.blog-post-header {
    margin-bottom: 40px;
}

.blog-post-title {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
}

.blog-post-meta {
    font-size: 15px;
    color: var(--color-text-tertiary);
    margin-bottom: 32px;
}

.blog-post-content {
    font-size: 17px;
    line-height: 1.8;
    color: var(--color-text-primary);
}

.blog-post-content h3 {
    font-size: 28px;
    font-weight: 600;
    margin: 40px 0 16px;
}

.blog-post-content h4 {
    font-size: 22px;
    font-weight: 600;
    margin: 32px 0 12px;
}

.blog-post-content p {
    margin-bottom: 20px;
}

.blog-post-content ul,
.blog-post-content ol {
    margin: 20px 0 20px 24px;
}

.blog-post-content li {
    margin-bottom: 10px;
}

.blog-post-content strong {
    font-weight: 600;
    color: var(--color-text-primary);
}

.blog-post-content a {
    color: var(--color-accent);
    text-decoration: none;
}

.blog-post-content a:hover {
    text-decoration: underline;
}

.blog-post-content blockquote {
    border-left: 4px solid var(--color-accent);
    padding-left: 20px;
    margin: 24px 0;
    font-style: italic;
    color: var(--color-text-secondary);
}

.blog-post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 15px;
}

.blog-post-content table th,
.blog-post-content table td {
    padding: 12px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.blog-post-content table th {
    background: var(--color-bg-secondary);
    font-weight: 600;
}

.back-link {
    display: inline-block;
    margin-bottom: 32px;
    color: var(--color-accent);
    text-decoration: none;
    font-size: 15px;
}

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

/* Buttons */
.btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    display: inline-block;
}

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

.btn-primary:hover {
    background: #0F6E56;
    transform: translateY(-1px);
}

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

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

.cta-group {
    display: flex;
    gap: 16px;
    margin-top: 32px;
}

/* Contact */
.contact-section {
    background: var(--color-bg-secondary);
    padding: 60px 0;
}

.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-content p {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

.contact-content .cta-group {
    justify-content: center;
}

/* Footer */
footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 14px;
}

/* Mobile */
@media (max-width: 768px) {
    h1 { font-size: 36px; }
    h2 { font-size: 28px; }
    .blog-post-title { font-size: 32px; }
    section { padding: 60px 0; }
    .hero { padding: 80px 0 60px; }
    nav ul { gap: 20px; font-size: 14px; }
    .cta-group { flex-direction: column; }
    .btn { width: 100%; text-align: center; }
    .blog-grid { grid-template-columns: 1fr; }
    .timeline { padding-left: 30px; }
    .timeline-item::before { left: -26px; }
}