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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

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

h1 {
    color: #333;
    margin-bottom: 10px;
    font-size: 2.5em;
}

header p {
    color: #666;
    font-size: 1.1em;
}

/* Sección de login */
.login-section, .packages-section, .payment-section {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    color: #333;
    margin-bottom: 25px;
    text-align: center;
    font-size: 1.8em;
}

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

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.3s;
}

input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Grid de paquetes */
.packages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.package-card {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    transition: all 0.3s;
    cursor: pointer;
    border: 2px solid #e0e0e0;
    position: relative;
    overflow: hidden;
}

.package-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    border-color: #667eea;
}

.package-card.selected {
    border-color: #667eea;
    background: linear-gradient(135deg, #f0f4ff 0%, #fff 100%);
}

.package-card h3 {
    font-size: 1.5em;
    color: #333;
    margin-bottom: 15px;
}

.price {
    font-size: 32px;
    font-weight: bold;
    color: #667eea;
    margin: 15px 0;
}

.price small {
    font-size: 14px;
    font-weight: normal;
    color: #666;
}

.package-features {
    margin: 20px 0;
    text-align: left;
}

.package-features div {
    padding: 8px 0;
    color: #555;
}

.package-features i {
    margin-right: 10px;
    color: #667eea;
}

/* Botones */
button {
    background: #667eea;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
    width: 100%;
}

button:hover:not(:disabled) {
    background: #5a67d8;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    font-size: 18px;
    padding: 15px;
}

.btn-success {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
}

.btn-success:hover {
    background: linear-gradient(135deg, #38a169 0%, #2f855a 100%);
}

/* Sección de pago */
.payment-details-card {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    margin: 20px 0;
    text-align: center;
}

.payment-details-card p {
    margin: 10px 0;
    font-size: 1.1em;
}

.payment-details-card strong {
    color: #667eea;
}

.total-amount {
    font-size: 2em;
    color: #48bb78;
    font-weight: bold;
    margin-top: 15px;
}

/* Mensajes de error */
.error-message {
    background: #fed7d7;
    color: #c53030;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
    border-left: 4px solid #c53030;
}

.success-message {
    background: #c6f6d5;
    color: #22543d;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
    border-left: 4px solid #38a169;
}

/* Loader */
.loader {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    
    h1 {
        font-size: 1.8em;
    }
    
    .packages-grid {
        grid-template-columns: 1fr;
    }
    
    .package-card {
        padding: 20px;
    }
}

/* Spinner de carga */
.spinner {
    text-align: center;
    padding: 40px;
}

.spinner div {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}