:root {
    --primary-color: #e63946;    /* Red */
    --secondary-color: #457b9d;  /* Blue */
    --light-blue: #a8dadc;
    --dark-blue: #1d3557;
    --light-gray: #f1faee;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

/* Navbar Styles */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand img {
    margin-right: 10px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 100px 0;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

/* Recharge Form */
.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.form-control, .form-select {
    padding: 0.75rem;
    border-radius: 8px;
}

.form-control:focus, .form-select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(69, 123, 157, 0.25);
}

/* Features Section */
.feature-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
}

.features .card {
    transition: transform 0.3s ease;
}

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

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #d62828;
    border-color: #d62828;
}

/* Footer */
footer {
    background-color: var(--dark-blue);
}

.social-links a {
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: var(--light-blue) !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        padding: 60px 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .navbar-brand {
        font-size: 1.2rem;
    }
}

/* Form Validation Styles */
.form-control.is-invalid {
    border-color: var(--primary-color);
    background-image: none;
}

.invalid-feedback {
    color: var(--primary-color);
}