/* Khởi tạo cơ bản */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}
:root {
    --primary-color: #0c4a6e; 
    --accent-color: #ea580c;  
    --text-dark: #334155;
    --light-bg: #f8fafc;
}
body {
    color: var(--text-dark);
    line-height: 1.6;
}
.container {
    width: 85%;
    margin: 0 auto;
    max-width: 1200px;
}
.section-padding {
    padding: 50px 0;
}
.section-title, .page-title {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 30px;
}
.page-title {
    font-size: 2.2rem;
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 10px;
    display: inline-block;
}

/* Header & Navigation */
.topbar {
    background-color: var(--primary-color);
    color: white;
    padding: 8px 0;
    font-size: 14px;
}
.topbar .container {
    display: flex;
    justify-content: space-between;
}
.main-header {
    background: white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}
.logo h2 {
    color: var(--primary-color);
}
.logo span {
    color: var(--accent-color);
}
nav ul {
    display: flex;
    list-style: none;
}
nav ul li a {
    text-decoration: none;
    color: var(--text-dark);
    padding: 10px 15px;
    font-weight: bold;
    transition: 0.3s;
}
nav ul li a:hover, nav ul li a.active {
    color: var(--accent-color);
}

/* Hero Banner */
.hero-banner {
    background: linear-gradient(rgba(12, 74, 110, 0.85), rgba(12, 74, 110, 0.85)), url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?q=80&w=1200') no-repeat center center/cover;
    height: 60vh;
    display: flex;
    align-items: center;
    text-align: center;
    color: white;
}
.hero-content {
    width: 100%;
}
.hero-content h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
}
.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}
.btn-main {
    background: var(--accent-color);
    color: white;
    padding: 12px 30px;
    text-decoration: none;
    font-weight: bold;
    border-radius: 5px;
    transition: 0.3s;
}
.btn-main:hover {
    background: #c2410c;
}

/* Services Grid tại trang chủ */
.services {
    background: var(--light-bg);
}
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}
.service-card {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border-top: 4px solid var(--primary-color);
    transition: transform 0.3s;
}
.service-card:hover {
    transform: translateY(-5px);
}
.service-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}
.read-more {
    display: inline-block;
    margin-top: 15px;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: bold;
}

/* Nội dung trang con */
.page-content p {
    margin-bottom: 15px;
}
.page-content ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

/* Footer */
footer {
    background: #1e293b;
    color: #94a3b8;
    padding: 40px 0;
    margin-top: 40px;
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}
footer h3 {
    color: white;
    margin-bottom: 20px;
}