/**
 * 公共样式文件
 * 包含基础样式、布局、响应式等
 */

/* ========== 基础重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

a:hover {
    color: #3498db;
}

ul, ol {
    list-style: none;
}

/* ========== 容器 ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* ========== 头部样式 ========== */
.site-header {
    background: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    background: #2c3e50;
    color: #fff;
    padding: 8px 0;
    font-size: 14px;
}

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

.header-top-left {
    display: flex;
    gap: 20px;
}

.header-info {
    display: flex;
    align-items: center;
    gap: 5px;
}

.header-info i {
    font-size: 14px;
}

.header-info a {
    color: #fff;
}

.header-info a:hover {
    color: #3498db;
}

.header-top-right {
    display: flex;
    gap: 15px;
}

.header-link {
    color: #fff;
    font-size: 14px;
}

.header-link:hover {
    color: #ecf0f1;
}

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

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

.logo {
    flex-shrink: 0;
}

.logo a {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: #2c3e50;
}

.logo-img {
    max-height: 50px;
    width: auto;
}

.logo-text {
    color: #2c3e50;
}

/* ========== 导航菜单 ========== */
.main-nav {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

.nav-menu {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    color: #333;
    font-size: 16px;
    font-weight: 500;
    padding: 8px 0;
    display: block;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #3498db;
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: #3498db;
}

/* ========== 移动端菜单按钮 ========== */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: #333;
    transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ========== 主内容区 ========== */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 40px 0;
}

/* ========== 页脚样式 ========== */
.site-footer {
    background: #2c3e50;
    color: #ecf0f1;
    margin-top: 60px;
}

.footer-content {
    padding: 50px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-column h3 {
    color: #fff;
    margin-bottom: 20px;
    font-size: 18px;
}

.footer-column p {
    margin-bottom: 10px;
    line-height: 1.8;
    color: #bdc3c7;
}

.footer-column p i {
    margin-right: 8px;
    color: #3498db;
}

.footer-column a {
    color: #bdc3c7;
}

.footer-column a:hover {
    color: #3498db;
}

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

.footer-links a {
    color: #bdc3c7;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #3498db;
    padding-left: 5px;
}

.footer-bottom {
    background: #1a252f;
    padding: 20px 0;
    text-align: center;
    color: #95a5a6;
    font-size: 14px;
}

/* ========== 图标字体（简单实现） ========== */
.icon-phone::before { content: "📞 "; }
.icon-email::before { content: "✉ "; }
.icon-location::before { content: "📍 "; }

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .header-top {
        font-size: 12px;
    }
    
    .header-top-left {
        flex-direction: column;
        gap: 5px;
    }
    
    .header-top-right {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .main-nav.mobile-open {
        max-height: 500px;
    }
    
    .nav-menu {
        flex-direction: column;
        gap: 0;
        padding: 20px;
    }
    
    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid #ecf0f1;
    }
    
    .nav-menu a {
        padding: 15px 0;
        display: block;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .main-content {
        padding: 20px 0;
    }
}

@media (max-width: 480px) {
    .logo a {
        font-size: 20px;
    }
    
    .logo-img {
        max-height: 40px;
    }
}