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

body {
    font-family: 'Microsoft YaHei', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

a {
    color: #3498db;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #2980b9;
}

/* Header Styles */
header {
    background: linear-gradient(135deg, #3498db, #2c3e50);
    color: white;
    padding: 60px 0 30px;
    text-align: center;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

header .subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Navigation Styles */
nav {
    background-color: #2c3e50;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: white;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 3px;
    transition: background-color 0.3s;
}

nav ul li a:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

/* Main Content Styles */
main {
    padding: 40px 0;
}

.card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin-bottom: 30px;
}

.card h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #f0f0f0;
}

/* About Section */
#about .content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#about .text p {
    margin-bottom: 15px;
}

/* Education Section */
.education-item {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid #f0f0f0;
}

.education-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.education-item h3 {
    color: #3498db;
    margin-bottom: 5px;
}

.period {
    font-style: italic;
    color: #7f8c8d;
    margin-bottom: 10px;
}

/* Contact Section */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
}

.contact-item i {
    font-size: 1.5rem;
    color: #3498db;
    width: 30px;
    text-align: center;
}

/* Footer Styles */
footer {
    background-color: #2c3e50;
    color: white;
    padding: 20px 0;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2.5rem;
    }
    
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav ul li {
        margin: 5px 0;
    }
    
    .card {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
    }
    
    header {
        padding: 40px 0 20px;
    }
    
    .card {
        padding: 15px;
    }
}