:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --border: #e5e7eb;
    --brand-color: #111827;
    --max-width: 1024px;
    --font-heading: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: all 0.2s ease;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    padding: 1.5rem 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

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

.brand {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--brand-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.02em;
}

.brand-symbol {
    color: var(--accent);
    font-weight: 900;
    font-size: 1.5rem;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

nav a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

nav a:hover, nav a.active {
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    text-decoration: none;
}

.lang-switch {
    margin-left: 1rem;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.lang-switch:hover {
    background-color: var(--bg-secondary);
    border-color: var(--text-secondary);
}

/* Hero Section */
.hero {
    padding: 5rem 0;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 3rem;
    line-height: 1.1;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

.hero p {
    font-size: 1.35rem;
    line-height: 1.6;
    color: var(--text-secondary);
    max-width: 680px;
    font-weight: 400;
}

/* Sections */
.section {
    padding: 4rem 0;
    border-top: 1px solid var(--border);
}

.section-title {
    margin-bottom: 2.5rem;
}

.section-title h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    border-color: var(--accent);
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.card p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

/* Subtle Link Styling for Footer/CTA */
.cta-text {
    margin-top: 3rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-style: italic;
}

.cta-text a {
    font-weight: 600;
    color: var(--accent);
}

/* Footer */
footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border);
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.social-links {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-wrapper {
        flex-direction: column;
        gap: 1.5rem;
        align-items: flex-start;
    }
    
    nav ul {
        flex-wrap: wrap;
        gap: 1rem;
    }
    
    .hero h1 {
        font-size: 2.25rem;
    }

    .hero p {
        font-size: 1.15rem;
    }
}