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

:root {
    --color-bg: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-light: #666666;
    --color-border: #E0E0E0;
    --color-accent: #000000;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navigation */
.navbar {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-accent);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

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

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

/* Hero */
.hero {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.hero h1 {
    font-size: 64px;
    font-weight: 700;
    letter-spacing: -2px;
    margin-bottom: var(--spacing-sm);
}

.tagline {
    font-size: 20px;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    font-weight: 400;
}

.description {
    font-size: 18px;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.8;
}

/* Buttons */
.cta-group {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.btn {
    padding: 14px 28px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: all 0.2s;
    display: inline-block;
}

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

.btn-primary:hover {
    opacity: 0.9;
}

.btn-outline {
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.btn-outline:hover {
    border-color: var(--color-accent);
}

/* Developer Highlight */
.developer-highlight {
    padding: var(--spacing-xl) 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.dev-card {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

.dev-info h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.5px;
}

.dev-role {
    font-size: 16px;
    color: var(--color-text-light);
    margin-bottom: 4px;
}

.dev-company {
    font-size: 15px;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.dev-description {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.dev-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.link-primary {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
}

.link-secondary {
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 15px;
}

.link-primary:hover,
.link-secondary:hover {
    text-decoration: underline;
}

.dev-meta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: 8px;
}

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

.meta-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-light);
    font-weight: 500;
}

.meta-item a,
.meta-item span {
    color: var(--color-text);
    text-decoration: none;
    font-size: 14px;
}

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

/* Features */
.quick-features {
    padding: var(--spacing-xl) 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.feature-item {
    padding: var(--spacing-md);
    text-align: center;
}

.feature-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.feature-item p {
    font-size: 14px;
    color: var(--color-text-light);
}

.cta-center {
    text-align: center;
}

/* Content Pages */
.page-header {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.page-title {
    font-size: 48px;
    font-weight: 600;
    letter-spacing: -1px;
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    font-size: 18px;
    color: var(--color-text-light);
}

.content-section {
    padding: var(--spacing-lg) 0;
    max-width: 800px;
    margin: 0 auto;
}

.content-section h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.content-section h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.content-section p {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.content-section ul {
    color: var(--color-text-light);
    line-height: 1.8;
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.back-link {
    display: inline-block;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 14px;
}

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

/* Footer */
.footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xl);
}

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

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

.footer-right {
    display: flex;
    gap: var(--spacing-md);
}

.footer-right a {
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 14px;
}

.footer-right a:hover {
    color: var(--color-accent);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 40px;
    }

    .dev-card {
        grid-template-columns: 1fr;
    }

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-menu {
        gap: var(--spacing-sm);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    .cta-group {
        flex-direction: column;
    }

    .dev-links {
        flex-direction: column;
    }
}