/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #10b981;
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --border-color: #e5e7eb;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --card-shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-dark);
}

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

/* Header */
.header {
    text-align: center;
    color: white;
    margin-bottom: 50px;
    padding: 40px 20px;
}

.header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header .subtitle {
    font-size: 1.25rem;
    opacity: 0.95;
}

/* Plans Grid */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

/* Plan Card */
.plan-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.plan-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.plan-card.popular {
    border: 3px solid var(--success-color);
    transform: scale(1.05);
}

.plan-card.popular:hover {
    transform: scale(1.05) translateY(-5px);
}

.badge {
    position: absolute;
    top: 20px;
    right: -35px;
    background: var(--success-color);
    color: white;
    padding: 5px 40px;
    transform: rotate(45deg);
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.plan-header {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.plan-header h2 {
    font-size: 1.75rem;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 5px;
}

.price .amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price .period {
    font-size: 1rem;
    color: var(--text-light);
}

/* Plan Features */
.plan-features {
    margin-bottom: 25px;
}

.plan-features ul {
    list-style: none;
}

.plan-features li {
    padding: 12px 0;
    color: var(--text-dark);
    font-size: 1rem;
    border-bottom: 1px solid var(--border-color);
}

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

/* Buy Button */
.btn-buy {
    width: 100%;
    padding: 15px 30px;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-buy:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn-buy:active {
    transform: translateY(0);
}

/* Info Section */
.info-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: var(--card-shadow);
}

.info-section h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: var(--text-dark);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.step {
    text-align: center;
}

.step-number {
    display: inline-block;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 50px;
    margin-bottom: 15px;
}

.step p {
    color: var(--text-dark);
    font-size: 1rem;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: var(--card-shadow);
}

.footer p {
    color: var(--text-dark);
    margin-bottom: 10px;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.footer a:hover {
    text-decoration: underline;
}

.footer .terms {
    margin-top: 15px;
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }

    .header .subtitle {
        font-size: 1rem;
    }

    .plans-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .plan-card.popular {
        transform: scale(1);
    }

    .plan-card.popular:hover {
        transform: translateY(-5px);
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .info-section {
        padding: 25px;
    }

    .price .amount {
        font-size: 2.5rem;
    }
}

/* Loading Overlay */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}