:root {
    --primary-color: #4CAF50;
    --secondary-color: #2196F3;
    --text-color: #333;
    --bg-color: #f5f5f5;
    --card-bg: #fff;
    --error-color: #f44336;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    color: var(--primary-color);
}

/* Pricing Cards */
.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    position: relative;
    transition: transform 0.3s ease;
}

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

.card.popular {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
}

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

.tag {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
}

.price {
    font-size: 36px;
    font-weight: bold;
    color: var(--primary-color);
    margin: 20px 0;
}

ul {
    list-style: none;
    padding: 0;
    margin-bottom: 20px;
}

li {
    margin: 10px 0;
    color: #666;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s ease;
    border: none;
    width: 100%;
    box-sizing: border-box;
}

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

.btn-primary:hover {
    background: #43a047;
}

.card .btn {
    background: #e0e0e0;
    color: #333;
}

.card .btn:hover {
    background: #d5d5d5;
}

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

.card.popular .btn:hover {
    background: #43a047;
}

/* Forms */
.payment-form {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    max-width: 500px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="email"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    box-sizing: border-box;
}

small {
    color: #999;
    font-size: 12px;
}

.error-message {
    color: var(--error-color);
    background: #ffebee;
    padding: 10px;
    border-radius: 5px;
    margin-top: 20px;
    text-align: center;
}

/* Success Page */
.success-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    max-width: 500px;
    margin: 0 auto;
}

.icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.info-box {
    background: #e3f2fd;
    padding: 15px;
    border-radius: 5px;
    margin: 20px 0;
}

.email-display {
    font-weight: bold;
    color: var(--secondary-color);
    font-size: 18px;
}

footer {
    text-align: center;
    margin-top: 40px;
    color: #999;
    font-size: 14px;
}