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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
    padding-top: 80px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航样式 */
.main-nav {
    background: #2c3e50;
    color: white;
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: #3498db;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.nav-logo span {
    font-size: 1.2rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.8;
}

/* Hero Section */
.hero {
    background: url(../image/images/b1.jpg);
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.9;
}

/* Mission Section */
.mission-section {
    padding: 80px 0;
    background: white;
}

.mission-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.mission-text h2 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 30px;
}

.mission-text p {
    color: #666;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.mission-image {
    background: #f8f9fa;
    border-radius: 12px;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: #3498db;
}

/* Values Section */
.values-section {
    padding: 80px 0;
    background: #f8f9fa;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.value-card {
    background: white;
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

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

.value-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: #3498db;
}

.value-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2c3e50;
}

.value-description {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* History Section */
.history-section {
    padding: 80px 0;
    background: white;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 40px auto 0;
    padding: 20px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    background: #3498db;
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    justify-content: flex-end;
    padding-right: 30px;
    margin-bottom: 40px;
    width: 50%;
    position: relative;
}

.timeline-item:nth-child(even) {
    align-self: flex-end;
    justify-content: flex-start;
    padding-right: 0;
    padding-left: 30px;
}

.timeline-content {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    position: relative;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 20px;
    right: -10px;
    width: 20px;
    height: 20px;
    background: #3498db;
    border-radius: 50%;
}

.timeline-item:nth-child(even) .timeline-content::before {
    right: auto;
    left: -10px;
}

.timeline-year {
    font-size: 1.2rem;
    font-weight: 600;
    color: #3498db;
    margin-bottom: 10px;
}

.timeline-text {
    color: #666;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .mission-content {
        grid-template-columns: 1fr;
    }
    
    .values-grid {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        width: 100%;
        padding-left: 30px;
        padding-right: 0;
        justify-content: flex-start;
    }

    .timeline-item:nth-child(even) {
        align-self: flex-start;
    }

    .timeline-content::before {
        left: -10px;
        right: auto;
    }
}

/* 移动端导航样式 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hamburger-menu {
        display: flex;
    }
}

/* 汉堡菜单样式 */
.hamburger-menu {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 10px;
    z-index: 1000;
}

.hamburger-menu span {
    display: block;
    width: 25px;
    height: 2px;
    background: white;
    transition: all 0.3s ease;
}

/* 汉堡菜单动画 */
.hamburger-menu.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger-menu.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* 移动导航菜单 */
.mobile-nav {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    height: auto;
    background: #2c3e50;
    padding: 20px 0;
    transform: translateY(-200%);
    transition: transform 0.3s ease;
    z-index: 99;
}

.mobile-nav.active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.mobile-nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-nav-links li {
    padding: 15px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-nav-links a {
    color: white;
    text-decoration: none;
    font-size: 1.1rem;
    display: block;
    padding: 5px 0;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hamburger-menu {
        display: flex;
    }

    .main-nav {
        padding: 15px 0;
    }

    .container {
        padding: 0 15px;
    }
    
    body {
        padding-top: 60px;
    }
    
    .mobile-nav {
        top: 60px;
    }
}
/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-left h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #3498db;
}

.footer-left p {
    opacity: 0.8;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-column h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #3498db;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column ul li a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-column ul li a:hover {
    opacity: 1;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 30px;
    text-align: center;
    opacity: 0.6;
}