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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #10b981;
    --dark: #0f172a;
    --gray: #64748b;
    --light-gray: #f1f5f9;
    --white: #ffffff;
    --max-width: 1200px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    overflow-x: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 20px 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

.logo {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-cta {
    background: var(--primary);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.nav-cta:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Course Hero Section */
.course-hero {
    padding: 100px 0 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.course-announcement {
    max-width: 800px;
    margin: 0 auto;
}

.course-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
}

.course-title {
    font-size: clamp(32px, 6vw, 56px);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.course-subtitle {
    font-size: clamp(16px, 4vw, 20px);
    margin-bottom: 30px;
    opacity: 0.9;
    line-height: 1.6;
}

.course-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 30px 0 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.course-feature {
    font-size: 16px;
    font-weight: 500;
    opacity: 0.95;
    text-align: left;
}

.course-cta {
    margin-top: 40px;
}

.btn-course {
    display: inline-block;
    background: white;
    color: #667eea;
    padding: 16px 32px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-course:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.course-note {
    margin-top: 12px;
    font-size: 14px;
    opacity: 0.8;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    text-align: center;
    background: linear-gradient(135deg, #f8fafc 0%, #e0f2fe 100%);
}

.hero-title {
    font-size: clamp(36px, 8vw, 64px);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.highlight {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(18px, 4vw, 24px);
    color: var(--gray);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    margin-bottom: 60px;
}

.btn-primary {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 16px 32px;
    font-size: 20px;
    font-weight: 600;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(37, 99, 235, 0.3);
}

.cta-note {
    margin-top: 12px;
    color: var(--gray);
    font-size: 14px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    color: var(--gray);
    font-size: 14px;
}

/* Problem Section */
.problem {
    padding: 80px 0;
    background: white;
}

.problem h2 {
    font-size: clamp(32px, 6vw, 48px);
    text-align: center;
    margin-bottom: 60px;
    font-weight: 800;
}

.pain-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.pain-point {
    text-align: center;
}


.pain-point h3 {
    font-size: 24px;
    margin-bottom: 12px;
    font-weight: 700;
}

.pain-point p {
    color: var(--gray);
    line-height: 1.8;
}

/* Solution Section */
.solution {
    padding: 80px 0;
    background: var(--light-gray);
}

.solution h2 {
    font-size: clamp(32px, 6vw, 48px);
    text-align: center;
    margin-bottom: 16px;
    font-weight: 800;
}

.section-subtitle {
    text-align: center;
    color: var(--gray);
    font-size: 20px;
    margin-bottom: 60px;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature {
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateY(-4px);
}


.feature h3 {
    font-size: 24px;
    margin-bottom: 12px;
    font-weight: 700;
}

.feature p {
    color: var(--gray);
    line-height: 1.8;
}

/* Referral Section */
.referral {
    padding: 80px 0;
    background: white;
}

.referral h2 {
    font-size: clamp(32px, 6vw, 48px);
    text-align: center;
    margin-bottom: 16px;
    font-weight: 800;
}

.referral-tiers {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 60px 0;
    flex-wrap: wrap;
}

.tier {
    background: var(--light-gray);
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    min-width: 200px;
}

.tier-level {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--gray);
    margin-bottom: 12px;
}

.tier-amount {
    font-size: 48px;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 8px;
}

.tier-desc {
    color: var(--gray);
}

.referral-example {
    max-width: 600px;
    margin: 0 auto;
    background: var(--light-gray);
    padding: 40px;
    border-radius: 16px;
    text-align: center;
}

.referral-example h3 {
    font-size: 24px;
    margin-bottom: 16px;
    font-weight: 700;
}

.referral-example p {
    color: var(--gray);
    margin-bottom: 24px;
}

.earning-calc {
    text-align: left;
    font-family: monospace;
    font-size: 18px;
    background: white;
    padding: 24px;
    border-radius: 8px;
}

.calc-line {
    margin-bottom: 8px;
    color: var(--gray);
}

.calc-total {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 2px solid var(--light-gray);
    font-weight: bold;
    color: var(--secondary);
    font-size: 24px;
}

.calc-disclaimer {
    margin-top: 16px;
    font-size: 14px;
    color: var(--gray);
    font-style: italic;
}

/* How It Works */
.how-it-works {
    padding: 80px 0;
    background: var(--light-gray);
}

.how-it-works h2 {
    font-size: clamp(32px, 6vw, 48px);
    text-align: center;
    margin-bottom: 60px;
    font-weight: 800;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.step {
    text-align: center;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--primary);
    color: white;
    font-size: 24px;
    font-weight: 800;
    border-radius: 50%;
    margin-bottom: 24px;
}

.step h3 {
    font-size: 24px;
    margin-bottom: 12px;
    font-weight: 700;
}

.step p {
    color: var(--gray);
    line-height: 1.8;
}

/* Testimonials */
.testimonials {
    padding: 80px 0;
    background: white;
}

.testimonials h2 {
    font-size: clamp(32px, 6vw, 48px);
    text-align: center;
    margin-bottom: 60px;
    font-weight: 800;
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.testimonial {
    background: var(--light-gray);
    padding: 40px;
    border-radius: 16px;
}

.testimonial p {
    font-size: 18px;
    font-style: italic;
    margin-bottom: 20px;
    line-height: 1.8;
}

.testimonial-author {
    color: var(--gray);
    font-size: 14px;
}

/* Join Section */
.join {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.join-box {
    text-align: center;
    color: white;
    max-width: 600px;
    margin: 0 auto;
}

.join h2 {
    font-size: clamp(32px, 6vw, 48px);
    margin-bottom: 16px;
    font-weight: 800;
}

.join-subtitle {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.price-tag {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 8px;
    margin-bottom: 12px;
}

.price {
    font-size: 72px;
    font-weight: 800;
}

.price-period {
    font-size: 24px;
    opacity: 0.8;
}

.price-note {
    opacity: 0.8;
    margin-bottom: 40px;
}

.btn-join {
    display: inline-block;
    background: white;
    color: var(--primary);
    padding: 16px 48px;
    font-size: 20px;
    font-weight: 700;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-join:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}


/* Footer */
.footer {
    padding: 40px 0;
    background: var(--dark);
    color: white;
    text-align: center;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-stats {
        gap: 30px;
    }
    
    .referral-tiers {
        flex-direction: column;
        align-items: center;
    }
    
    .tier {
        width: 100%;
        max-width: 300px;
    }
    
    .earning-calc {
        font-size: 16px;
        padding: 16px;
    }
}