:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #ec4899;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --light-bg: #f9fafb;
    --accent-bg: #eef2ff;
    --border-color: #e5e7eb;
    --gradient: linear-gradient(135deg, #6366f1 0%, #ec4899 100%);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: var(--text-color); line-height: 1.6; background: var(--bg-color); }
a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}
.btn-primary {
    background: var(--primary-color);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}
.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}
.btn-secondary:hover {
    background: var(--accent-bg);
}
.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.nav {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}
.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}
.logo {
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav-links {
    display: flex;
    gap: 2.5rem;
}
.nav-links a {
    color: var(--text-light);
    font-weight: 500;
}
.nav-links a:hover {
    color: var(--primary-color);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-link {
    color: var(--text-light);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.lang-link:hover {
    color: var(--primary-color);
    background: var(--accent-bg);
}

.lang-link.active {
    color: var(--primary-color);
    font-weight: 600;
}

.lang-divider {
    color: var(--border-color);
    font-size: 0.875rem;
}

.hero {
    padding: 6rem 0 4rem;
    text-align: center;
}
.hero-content {
    max-width: 900px;
    margin: 0 auto;
}
.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}
.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    padding: 2rem;
    background: var(--light-bg);
    border-radius: 16px;
}
.stat {
    text-align: center;
}
.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label {
    color: var(--text-light);
    font-weight: 500;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}
.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}
.section-subtitle {
    color: var(--text-light);
    font-size: 1.125rem;
}

.comprehension {
    padding: 5rem 0;
    background: var(--light-bg);
}
.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}
.problem-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}
.problem-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}
.problem-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}
.problem-card p {
    color: var(--text-light);
}
.solution-banner {
    text-align: center;
    padding: 2rem;
    background: var(--accent-bg);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}
.solution-banner h3 {
    font-size: 1.5rem;
    color: var(--primary-dark);
}

.features {
    padding: 5rem 0;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}
.feature-card {
    padding: 2rem;
    background: white;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.15);
    border-color: var(--primary-color);
}
.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}
.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}
.feature-card p {
    color: var(--text-light);
}

.curricula {
    padding: 5rem 0;
    background: var(--light-bg);
}
.curricula-tabs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}
.curriculum-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}
.curriculum-card.active {
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.2);
}
.curriculum-card:hover {
    transform: translateY(-2px);
}
.curriculum-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--accent-bg);
    color: var(--primary-dark);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}
.curriculum-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}
.curriculum-card > p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}
.curriculum-highlights {
    padding-left: 1.5rem;
}
.curriculum-highlights li {
    color: var(--text-light);
    margin-bottom: 0.5rem;
    position: relative;
}
.curriculum-highlights li::before {
    content: "✓";
    color: var(--primary-color);
    position: absolute;
    left: -1.5rem;
    font-weight: bold;
}

.testimonials {
    padding: 5rem 0;
}
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.testimonial-card {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 12px;
    position: relative;
}
.testimonial-quote {
    font-size: 1.125rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    font-style: italic;
}
.testimonial-quote::before {
    content: '"';
    font-size: 4rem;
    color: var(--primary-color);
    opacity: 0.2;
    position: absolute;
    top: -0.5rem;
    left: 1rem;
}
.author-name {
    font-weight: 600;
    color: var(--text-color);
}
.author-role {
    color: var(--text-light);
    font-size: 0.875rem;
}

.cta {
    padding: 6rem 0;
    background: var(--gradient);
    text-align: center;
}
.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
}
.cta-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: 2rem;
}
.cta-form {
    display: flex;
    gap: 1rem;
    max-width: 500px;
    margin: 0 auto 1.5rem;
}
.cta-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
}
.cta-input:focus {
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}
.cta-note {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

.footer {
    padding: 4rem 0 2rem;
    background: #111827;
    color: #f3f4f6;
}
.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}
.footer-brand {
    max-width: 300px;
}
.footer-tagline {
    color: #9ca3af;
    margin-top: 1rem;
    line-height: 1.6;
}
.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.footer-column h4 {
    color: white;
    font-weight: 600;
    margin-bottom: 1rem;
}
.footer-column ul li {
    margin-bottom: 0.75rem;
}
.footer-column ul li a {
    color: #9ca3af;
}
.footer-column ul li a:hover {
    color: white;
}
.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid #374151;
    text-align: center;
    color: #6b7280;
}

@media (max-width: 768px) {
    .nav-content {
        flex-direction: column;
        gap: 1rem;
    }
    .nav-links {
        gap: 1.5rem;
        font-size: 0.875rem;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    .hero-stats {
        flex-direction: column;
        gap: 2rem;
    }
    .cta-form {
        flex-direction: column;
    }
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .footer-links {
        grid-template-columns: 1fr;
    }
}