:root {
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --text-tertiary: #999;
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --border-color: #e5e5e5;
    --accent: #0066cc;
    --accent-hover: #0052a3;
    --max-width: 680px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 20px;
}

header {
    margin-bottom: 60px;
}

.name {
    font-size: 42px;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.tagline {
    color: var(--text-secondary);
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.beer-icon {
    color: #f28e1c;
    animation: cheers 3s ease-in-out infinite;
}

@keyframes cheers {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(-10deg); }
    75% { transform: rotate(10deg); }
}

nav {
    display: flex;
    gap: 24px;
    margin-bottom: 60px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -21px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--text-primary);
    transform: scaleX(0);
    transition: transform var(--transition);
}

.nav-link.active::after {
    transform: scaleX(1);
}

.section {
    margin-bottom: 80px;
}

.section h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: -0.01em;
}

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

.project-grid {
    display: grid;
    gap: 24px;
    margin-top: 32px;
}

.project {
    padding: 24px;
    background: var(--bg-secondary);
    border-radius: 8px;
    transition: transform var(--transition), box-shadow var(--transition);
}

.project:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.project-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.project-icon {
    font-size: 24px;
    color: var(--accent);
}

.project h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.project p {
    font-size: 14px;
    margin-bottom: 12px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    display: inline-block;
    padding: 4px 8px;
    background: var(--bg-primary);
    color: var(--text-tertiary);
    font-size: 12px;
    border-radius: 4px;
    font-weight: 500;
}

.writing-list {
    margin-top: 24px;
}

.writing-item {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 16px;
}

.writing-item time {
    color: var(--text-tertiary);
    font-size: 14px;
    min-width: 45px;
    font-variant-numeric: tabular-nums;
}

.writing-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 15px;
    transition: color var(--transition);
    position: relative;
}

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

.writing-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: currentColor;
    opacity: 0.2;
}

.contact-links {
    display: flex;
    gap: 24px;
    margin-top: 24px;
}

.contact-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.contact-link i {
    font-size: 16px;
}

.contact-link:hover {
    color: var(--accent);
    transform: translateX(2px);
}

.contact-link:hover i {
    transform: scale(1.1);
}

footer {
    margin-top: 100px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

footer p {
    color: var(--text-tertiary);
    font-size: 14px;
}

@media (max-width: 640px) {
    .container {
        padding: 40px 20px;
    }

    header {
        margin-bottom: 40px;
    }

    .name {
        font-size: 32px;
    }

    nav {
        margin-bottom: 40px;
    }

    .section {
        margin-bottom: 60px;
    }

    .writing-item {
        flex-direction: column;
        gap: 4px;
    }

    .contact-links {
        flex-direction: column;
        gap: 12px;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #e5e5e5;
        --text-secondary: #a0a0a0;
        --text-tertiary: #666;
        --bg-primary: #0a0a0a;
        --bg-secondary: #141414;
        --border-color: #262626;
        --accent: #4a9eff;
        --accent-hover: #3a8eef;
    }

    .tag {
        background: #1a1a1a;
    }

    .project {
        background: #0f0f0f;
    }

    .project:hover {
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }
}