:root {
    --primary-color: #005f73;
    --secondary-color: #0a9396;
    --background-color: #f7f9fa;
    --text-color: #333;
    --light-gray: #f4f4f4;
    --white: #ffffff;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
    line-height: 1.8;
    margin: 0;
    padding: 0;
    background-color: var(--white);
    color: var(--text-color);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: auto;
}

header {
    background: var(--white);
    color: var(--text-color);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav .logo h1 {
    margin: 0;
    color: var(--primary-color);
    font-size: 1.8rem;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

main {
    padding-top: 90px;
}

section {
    padding: 4rem 0;
}

#hero {
    background: linear-gradient(rgba(0, 95, 115, 0.7), rgba(0, 95, 115, 0.7)), url('/images/hero-bg.jpg') no-repeat center center/cover;
    color: var(--white);
    text-align: center;
    padding: 120px 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

#hero .hero-content {
    max-width: 800px;
}

#hero .hero-content h2 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
}

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

.btn {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 12px 25px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #007f82;
}

section h2 {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 3rem;
}

#about {
    background-color: var(--background-color);
}

#about p {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
}

.service-list, .university-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.service-item, .university-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-item:hover, .university-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.service-item h3, .university-item h4 {
    color: var(--secondary-color);
    font-size: 1.4rem;
    margin-top: 0;
    margin-bottom: 1rem;
}

#universities {
     background-color: var(--background-color);
}

#contact {
    text-align: center;
    background-color: var(--white);
}

#contact p {
    font-size: 1.1rem;
    margin: 0.5rem 0;
}

#contact .qr-code {
    margin-top: 2rem;
}

#contact .qr-code img {
    width: 120px;
    height: 120px;
    border: 1px solid #ddd;
    padding: 5px;
    border-radius: 5px;
}

footer {
    text-align: center;
    padding: 20px;
    background: var(--primary-color);
    color: var(--white);
}