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

:root {
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --secondary: #10B981;
    --accent: #F59E0B;
    --bg: #0F172A;
    --bg-light: #1E293B;
    --text: #F8FAFC;
    --text-muted: #94A3B8;
    --border: #334155;
    --gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    background: rgba(15, 23, 42, 0.9);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav {
    display: flex;
    gap: 32px;
}

.nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-full {
    width: 100%;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
    background: var(--bg-light);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

/* Hero */
.hero {
    padding: 150px 0 100px;
    text-align: center;
    background: radial-gradient(ellipse at top, rgba(79, 70, 229, 0.15) 0%, transparent 50%);
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(to right, #fff, #A5B4FC);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

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

.stat {
    text-align: center;
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--secondary);
}

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

/* Sections */
.section-title {
    font-size: 40px;
    text-align: center;
    margin-bottom: 16px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto 60px;
}

/* Features */
.features {
    padding: 100px 0;
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg);
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--border);
    transition: transform 0.2s;
}

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

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-muted);
}

/* Referral */
.referral {
    padding: 100px 0;
    background: radial-gradient(ellipse at center, rgba(245, 158, 11, 0.1) 0%, transparent 70%);
}

.referral-calc {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    max-width: 600px;
    margin: 0 auto 60px;
}

.referral-calc h3 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 24px;
}

.calc-row {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.calc-row label {
    min-width: 180px;
    color: var(--text-muted);
}

.calc-slider {
    flex: 1;
    min-width: 200px;
}

.calc-select {
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-size: 16px;
}

.calc-result {
    background: var(--bg);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 24px;
}

.result-item {
    text-align: center;
}

.result-item span {
    display: block;
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 8px;
}

.result-item strong {
    font-size: 28px;
    color: var(--secondary);
}

.referral-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    max-width: 150px;
}

.step-num {
    width: 48px;
    height: 48px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 20px;
    margin: 0 auto 12px;
}

.step-arrow {
    font-size: 24px;
    color: var(--primary);
}

/* Pricing */
.pricing {
    padding: 100px 0;
    background: var(--bg-light);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card.popular {
    border-color: var(--primary);
    transform: scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient);
    color: white;
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: 24px;
}

.pricing-header h3 {
    font-size: 24px;
    margin-bottom: 8px;
}

.pricing-price {
    font-size: 40px;
    font-weight: 700;
    color: var(--secondary);
}

.pricing-price span {
    font-size: 16px;
    color: var(--text-muted);
    font-weight: 400;
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
    flex: 1;
}

.pricing-features li {
    padding: 8px 0;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.pricing-features li:last-child {
    border-bottom: none;
}

/* FAQ */
.faq {
    padding: 100px 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-question {
    padding: 20px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: '+';
    font-size: 24px;
    color: var(--primary);
}

.faq-item.active .faq-question::after {
    content: '−';
}

.faq-answer {
    padding: 0 24px 20px;
    color: var(--text-muted);
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

/* CTA */
.cta {
    padding: 100px 0;
    text-align: center;
    background: var(--gradient);
}

.cta h2 {
    font-size: 40px;
    margin-bottom: 16px;
}

.cta p {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.9;
}

/* Footer */
.footer {
    padding: 60px 0 30px;
    background: var(--bg);
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
}

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

.footer-copy {
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .hero h1 {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .pricing-card.popular {
        transform: none;
    }
    
    .referral-steps {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
    }
}

/* Range slider styling */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
}