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

:root {
    --primary: #1a1a1a;
    --secondary: #666666;
    --light: #999999;
    --accent: #000000;
    --background: #ffffff;
    --border: #f0f0f0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--primary);
    background-color: var(--background);
    font-weight: 400;
}

h1, h2, h3, h4 {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    line-height: 1.3;
    color: var(--accent);
}

h1 {
    font-size: 2rem;
    margin-bottom: 24px;
    font-weight: 600;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 48px;
    font-weight: 600;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    font-weight: 600;
}

h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    font-weight: 500;
}

p {
    font-size: 1rem;
    margin-bottom: 24px;
    color: var(--secondary);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 32px;
}

/* Navigation */
nav {
    background: var(--background);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 32px;
    max-width: 800px;
    margin: 0 auto;
}

.logo {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    color: var(--accent);
    text-decoration: none;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--secondary);
    font-weight: 400;
    font-size: 0.95rem;
    transition: color 200ms ease;
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--secondary);
}

/* Hero Section */
.hero {
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    margin-bottom: 16px;
}

.hero p {
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto;
    color: var(--secondary);
}

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

.section-title {
    text-align: left;
    margin-bottom: 64px;
    font-size: 1.5rem;
}

/* Content Lists */
.content-list {
    margin-bottom: 48px;
}

.content-item {
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.content-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

/* Links */
.simple-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    border-bottom: 1px solid transparent;
    transition: border-color 200ms ease;
}

.simple-link:hover {
    border-bottom-color: var(--accent);
}

/* Meta information */
.meta {
    font-size: 0.85rem;
    color: var(--light);
    margin-bottom: 12px;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 48px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-content p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--light);
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    color: var(--secondary);
    text-decoration: none;
    padding: 8px;
    border: 1px solid var(--border);
    transition: all 200ms ease;
    font-size: 0.9rem;
}

.social-links a:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-1px);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .container {
        padding: 0 24px;
    }

    .nav-container {
        padding: 20px 24px;
    }

    .hero {
        padding: 64px 0;
    }

    section {
        padding: 64px 0;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

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

/* Simple mobile menu */
@media (max-width: 768px) {
    .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--background);
        border-bottom: 1px solid var(--border);
        padding: 24px 32px;
        gap: 16px;
    }
}