:root {
    --primary-color: #000000;
    --secondary-color: #666666;
    --bg-color: #ffffff;
    --accent-bg: #f8f9fa;
    --text-color: #1a1a1a;
    --border-color: #eaeaea;
    --max-width: 1100px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden;
    scroll-behavior: smooth;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1 { font-size: 4rem; font-weight: 700; line-height: 1.1; margin-bottom: 1.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2.5rem; font-weight: 700; margin-bottom: 1.5rem; letter-spacing: -0.01em; }
h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.5rem; }

.section-title {
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    color: var(--secondary-color);
    margin-bottom: 4rem;
    font-size: 1.1rem;
}

/* Header & Nav */
header {
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    transition: var(--transition);
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: #333;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: var(--accent-bg);
    transform: translateY(-2px);
}

/* Hero */
.hero {
    padding: 10rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--secondary-color);
    margin-bottom: 3rem;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* Features */
.features {
    padding: 8rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 3rem 2rem;
    background: var(--accent-bg);
    border-radius: 12px;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card .icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

/* Languages */
.languages {
    padding: 8rem 0;
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
}

.lang-card {
    background: #fff;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 16px;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: var(--transition);
}

.lang-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.lang-code {
    background: var(--accent-bg);
    color: var(--primary-color);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    flex-shrink: 0;
}

.lang-info h3 {
    margin-bottom: 0.1rem;
    font-size: 1.1rem;
}

.lang-info p {
    color: var(--secondary-color);
    font-size: 0.85rem;
}

/* CTA */
.cta {
    padding: 8rem 0;
    text-align: center;
    background: var(--accent-bg);
    border-radius: 20px;
    margin-bottom: 8rem;
}

.cta h2 { font-size: 3rem; margin-bottom: 1rem; }
.cta p { font-size: 1.25rem; color: var(--secondary-color); margin-bottom: 2.5rem; }

/* Footer */
footer {
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-logo {
    font-weight: 700;
    letter-spacing: 0.1em;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .hero { padding: 6rem 0; }
    .nav-links { display: none; }
    .footer-content { flex-direction: column; text-align: center; }
    .footer-links { flex-direction: column; gap: 1rem; }
}