/* Reset và styles chung */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

/* Cards */
.card {
    transition: transform 0.3s ease;
    border: none;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

/* Buttons */
.btn {
    padding: 0.8rem 1.5rem;
    border-radius: 5px;
}

.btn-primary {
    background-color: #4a90e2;
    border-color: #4a90e2;
}

.btn-primary:hover {
    background-color: #357abd;
    border-color: #357abd;
}

.btn-outline-secondary {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 2px solid #6c757d;
    background: transparent;
    z-index: 1;
}

.btn-outline-secondary:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: #6c757d;
    transition: all 0.4s ease;
    z-index: -1;
}

.btn-outline-secondary:hover {
    color: #fff;
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(108, 117, 125, 0.4);
}

.btn-outline-secondary:hover:before {
    left: 0;
}

/* Navbar */
.navbar {
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: bold;
}

/* Footer */
footer {
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section {
        text-align: center;
    }
    
    .d-md-flex {
        justify-content: center;
    }
}

/* Service page styles */
.service-container {
    min-height: calc(100vh - 76px);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.service-container .card {
    transition: transform 0.3s ease;
    border: none;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

.service-container .card-body {
    padding: 2rem;
}

.service-container h2 {
    color: white;
    margin-bottom: 2rem;
}

#userName {
    font-weight: bold;
    color: #ffd700;
}