/* Thiết lập cơ bản */
:root {
    --primary-color: #007bff; /* Màu chủ đạo: Xanh dương */
    --secondary-color: #28a745; /* Màu phụ: Xanh lá cây */
    --text-color: #333;
    --bg-color: #f8f9fa;
    --card-bg: #fff;
}

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

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

a {
    text-decoration: none;
    color: var(--primary-color);
}

ul {
    list-style: none;
}

.container {
    width: 85%;
    max-width: 1200px;
    margin: auto;
    overflow: hidden;
}

/* Header và Navigation */
.header {
    background: var(--card-bg);
    color: var(--text-color);
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

nav ul {
    display: flex;
}

nav ul li a {
    color: var(--text-color);
    padding: 0.5rem 1rem;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--primary-color);
}

/* Phần Giới thiệu (Hero) */
.hero {
    background: var(--primary-color);
    color: var(--card-bg);
    padding: 4rem 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--card-bg);
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background: #1e7e34; /* Màu xanh đậm hơn */
}

/* Phần Dịch vụ */
.services {
    padding: 4rem 0;
    text-align: center;
}

.services h3 {
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.service-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.service-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: left;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.service-card h4 {
    color: var(--primary-color);
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.service-card p {
    font-size: 0.95rem;
    color: #555;
}

.service-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

/* Footer */
.footer {
    background: #343a40;
    color: var(--card-bg);
    text-align: center;
    padding: 1.5rem 0;
    font-size: 0.9rem;
}