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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #10b981;
    --dark: #1e293b;
    --light: #f8fafc;
    --border: #e2e8f0;
    --text: #334155;
    --text-light: #64748b;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--light);
}

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

/* Navbar */
.navbar {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

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

.lang-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border);
    background: white;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
    border-radius: 5px;
}

.lang-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

/* Hero Section */
.hero {
    background: var(--gradient);
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.btn-large {
    padding: 1rem 3rem;
    font-size: 1.1rem;
}

/* Advantages Section */
.advantages {
    padding: 5rem 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--dark);
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.advantage-card {
    text-align: center;
    padding: 2rem;
    border-radius: 12px;
    background: var(--light);
    transition: transform 0.3s, box-shadow 0.3s;
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.advantage-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.advantage-card h3 {
    margin-bottom: 1rem;
    color: var(--dark);
}

/* How It Works */
.how-it-works {
    padding: 5rem 0;
    background: var(--light);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 1rem;
}

/* Cards Section */
.cards-section {
    padding: 5rem 0;
    background: white;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.card-offer {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s;
    position: relative;
}

.card-offer:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.card-offer.featured {
    border: 3px solid var(--primary-color);
}

.badge {
    position: absolute;
    top: -15px;
    right: 20px;
    background: var(--secondary-color);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.card-visual {
    background: var(--card-gradient);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    color: white;
    position: relative;
    height: 180px;
}

.mastercard-logo {
    font-weight: bold;
    font-size: 1.3rem;
    text-align: left;
}

.card-chip {
    width: 50px;
    height: 40px;
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    border-radius: 8px;
    position: absolute;
    bottom: 20px;
    left: 20px;
}

.card-price {
    margin: 1.5rem 0;
}

.price-label {
    display: block;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.price-amount {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* Purchase Page */
.purchase-section {
    padding: 3rem 0;
    min-height: calc(100vh - 200px);
}

.purchase-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.purchase-form-container {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.purchase-form-container h1 {
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.subtitle {
    color: var(--text-light);
    margin-bottom: 2rem;
}

.purchase-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark);
}

.form-group input,
.form-group select {
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.captcha-group .captcha-container {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.captcha-display {
    flex: 1;
    background: var(--light);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    font-size: 1.5rem;
    font-weight: bold;
    text-align: center;
    letter-spacing: 0.5rem;
    font-family: 'Courier New', monospace;
    user-select: none;
}

.captcha-refresh {
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background 0.3s;
}

.captcha-refresh:hover {
    background: var(--primary-hover);
}

.checkbox-group {
    flex-direction: row;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.error-message {
    background: #fef2f2;
    color: #dc2626;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid #dc2626;
}

.success-message {
    background: #f0fdf4;
    color: #16a34a;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid #16a34a;
}

/* Terms Container */
.terms-container {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 100px;
}

.terms-container h2 {
    margin-bottom: 1.5rem;
    color: var(--dark);
}

.terms-section {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.terms-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.terms-section h3 {
    margin-bottom: 1rem;
    color: var(--dark);
}

.terms-section h4 {
    margin: 1rem 0 0.5rem;
    color: var(--text);
}

.terms-section ol {
    margin-left: 1.5rem;
}

.terms-section li {
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background: var(--dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .purchase-content {
        grid-template-columns: 1fr;
    }
    
    .terms-container {
        position: static;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
}