:root {
    --primary-color: #003366; /* Deep Blue */
    --secondary-color: #f0f2f5; /* Light Grey Background */
    --accent-color: #d4af37; /* Gold for buttons/highlights */
    --text-color: #333333;
    --white: #ffffff;
}

body {
    font-family: 'Roboto', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
}

/* Navbar */
.navbar {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: 700;
    color: var(--primary-color) !important;
}

.nav-link {
    color: var(--text-color) !important;
    font-weight: 500;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color) !important;
}

.btn-lang {
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 5px 15px;
    border-radius: 20px;
    transition: all 0.3s;
}

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

/* Hero Section */
.hero-section {
    background: linear-gradient(rgba(0, 51, 102, 0.7), rgba(0, 51, 102, 0.7)), url('../images/banner-bg.jpg');
    background-size: cover;
    background-position: center;
    color: var(--white);
    padding: 100px 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 30px;
    font-weight: 300;
}

.btn-primary-custom {
    background-color: var(--accent-color);
    border: none;
    padding: 10px 30px;
    color: var(--white);
    font-weight: 600;
    border-radius: 5px;
}

.btn-primary-custom:hover {
    background-color: #c09b2d;
    color: var(--white);
}

/* Sections */
.section-padding {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 10px;
    color: var(--primary-color);
    font-weight: 600;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
    margin: 0px auto 0;
}

/* Cards */
.card {
    border: none;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

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

.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 50px 0 20px;
}

footer h5 {
    color: var(--accent-color);
    margin-bottom: 20px;
}

footer a {
    color: #ccc;
    text-decoration: none;
}

footer a:hover {
    color: var(--white);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    .hero-subtitle {
        font-size: 1.2rem;
    }
}