/* 公共样式 - 所有页面共用 */

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

html {
    height: 100%;
    background: #000; /* 确保整个 html 背景为黑色 */
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: #000; /* 确保 body 背景为黑色 */
}

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

/* 导航栏 */
nav {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

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

nav .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
    text-decoration: none;
    transition: color 0.3s;
}

nav .logo:hover {
    color: #3498db;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: #333;
    transition: all 0.3s;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

nav a:hover {
    color: #3498db;
    background: rgba(52, 152, 219, 0.1);
}

nav a.active {
    color: #3498db;
    background: rgba(52, 152, 219, 0.15);
    font-weight: 600;
}

/* 主内容区域 */
main {
    flex: 1;
    padding: 0; /* 移除padding，避免黑色间隙 */
}

.content-wrapper {
    background: white;
    margin: 2rem auto;
    padding: 3rem 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    animation: fadeIn 0.5s;
}

/* 页脚 */
footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 3rem 0 2rem;
    margin-top: auto;
    width: 100%; /* 确保页脚占满宽度 */
    position: relative;
    z-index: 10;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section {
    flex: 1;
    min-width: 250px;
}

.footer-section h3 {
    color: #3498db;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    color: #ecf0f1;
    transition: color 0.3s;
}

.contact-item:hover {
    color: #3498db;
}

.contact-item .icon {
    font-size: 1.2rem;
    width: 24px;
}

.contact-item a {
    color: #ecf0f1;
    text-decoration: none;
    transition: color 0.3s;
}

.contact-item a:hover {
    color: #667eea;
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #bdc3c7;
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav .container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    nav a {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }

    .footer-content {
        flex-direction: column;
    }

    .content-wrapper {
        padding: 2rem 1rem;
    }
}