:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --bg: #f3f4f6;
    --card-bg: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
    --success: #10b981;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 600px;
}

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

h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 10px;
    color: var(--primary-dark);
}

.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
}

.plan-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.plan-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border: 2px solid var(--primary);
}

.plan-name {
    font-weight: 600;
    margin-bottom: 10px;
}

.plan-price {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 5px;
}

.plan-duration {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 100;
    justify-content: center;
    align-items: center;
}

.modal.flex {
    display: flex;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: 16px;
    width: 90%;
    max-width: 400px;
    position: relative;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.close-modal {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 28px;
    cursor: pointer;
    color: #9ca3af;
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

input {
    width: 100%;
    padding: 12px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

button {
    width: 100%;
    background: var(--primary);
    color: white;
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: var(--primary-dark);
}

.hidden {
    display: none !important;
}

#status-message {
    margin-top: 15px;
    text-align: center;
    padding: 10px;
    border-radius: 6px;
}

#status-message.success {
    background: #d1fae5;
    color: #065f46;
}

#status-message.error {
    background: #fee2e2;
    color: #991b1b;
}

.summary {
    background: #f9fafb;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
}