/* ===== 全局基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: '微软雅黑', system-ui, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f9f9f9;
}

/* 层级管理系统 */
:root {
    --z-index-navigation: 1000;
    --z-index-carousel: 50;
    --z-index-carousel-content: 100;
}

/* ===== 导航栏样式 ===== */
.main-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: var(--z-index-navigation);
    background: rgba(192,0,0,0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.carousel {
    position: relative;
    z-index: var(--z-index-carousel);
}

.banner-content {
    position: relative;
    z-index: var(--z-index-carousel-content);
    margin-top: env(safe-area-inset-top); /* iOS安全区域适配 */
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.5rem 1rem;
    height: 60px;
}

.brand-logo img {
    width: 100px;
    transition: transform 0.3s;
}

.company-name {
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    margin-left: 1rem;
    margin-right: 20rem;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    padding: 0.8rem 1rem;
    position: relative;
    transition: color 0.3s;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #fff;
    transition: width 0.3s;
}

.nav-link:hover::after {
    width: 100%;
}

/* 移动端导航 */
.hamburger {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    background: white;
    margin: 5px 0;
    transition: all 0.3s ease;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    
    
	.nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        max-width: 60%; /* 新增：限制最大宽度 */
        width: 80%; /* 新增：初始宽度设为80% */
        height: 80vh; /* 修改：高度设为视窗的75% */
        max-height: 400px; /* 新增：最大高度限制 */
        overflow-y: auto; /* 新增：添加垂直滚动条 */
        background: rgba(192,0,0,0.98);
        flex-direction: column; /* 保持垂直排列 */
        padding: 1.5rem;
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
		  
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .company-name {
        display: none;
    }
}

/* ===== 公共组件 ===== */
/* 加载动画 */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.98);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease;
}
.loader.hidden {
    opacity: 0;

/* 页脚样式 */
.main-footer {
    background: #333;
    color: white;
    padding: 2rem;
    text-align: center;
    margin-top: 4rem;
}

/* 内容容器 */
.main-content {
    margin-top: 80px;
    padding: 2rem 1rem;
	position: relative;
    z-index: 1; /* 确保内容在导航栏下方 */
}

/* 在common.css中添加以下响应式断点 */

/* ===== 响应式断点 ===== */
/* 超大桌面 (≥1600px) */
@media (min-width: 1600px) {
    .main-nav {
        max-width: 1400px;
    }
}

/* 中等桌面 (1200px-1599px) */
@media (min-width: 1200px) and (max-width: 1599px) {
    .company-name {
        margin-right: 15rem;
    }
}

/* 小桌面/平板横屏 (992px-1199px) */
@media (min-width: 992px) and (max-width: 1199px) {
    .company-name {
        font-size: 1.3rem;
        margin-right: 10rem;
    }
    
    .nav-menu {
        gap: 1.5rem;
    }
}

/* 平板竖屏 (768px-991px) */
@media (min-width: 768px) and (max-width: 991px) {
    .company-name {
        display: none; /* 平板竖屏隐藏公司名称 */
    }
    
    .nav-link {
        padding: 0.6rem 0.8rem;
        font-size: 0.95rem;
    }
    
    .brand-logo img {
        width: 90px;
    }
	
	.feature-card {
        padding: 1.5rem;
        margin: 0 0.5rem;
    }
    
    .carousel {
        min-height: 400px;
    }
}

/* 大屏手机 (576px-767px) */
@media (min-width: 576px) and (max-width: 767px) {
    .main-nav {
        padding: 0.5rem;
    }
    
    .brand-logo img {
        width: 85px;
    }
}

/* 小屏手机 (≤575px) */
@media (max-width: 575px) {
    .brand-logo img {
        width: 70px;
    }
    
    .nav-menu {
        width: 100%;
        padding: 1rem;
    }
    
    .nav-link {
        font-size: 0.9rem;
        padding: 0.5rem;
    }
}

/* 超小屏手机 (≤375px) */
@media (max-width: 375px) {
    .brand-logo img {
        width: 60px;
    }
    
    .hamburger {
        right: 10px;
    }
    
    .nav-menu {
        padding: 1rem 0.5rem;
    }
}

/* 手机横屏优化 */
@media (max-width: 767px) and (orientation: landscape) {
    .nav-menu {
        max-height: 70vh;
    }
}

/* 最小触控尺寸 */
@media (pointer: coarse) {
    .nav-link {
        padding: 1rem;
        min-width: 80px;
    }
    
    button {
        min-width: 100px;
        padding: 1rem 1.5rem;
    }
}


/* 2倍屏优化 */
@media 
(-webkit-min-device-pixel-ratio: 2), 
(min-resolution: 192dpi) { 
    .brand-logo img {
        width: 120px; /* 原图应为2倍大小 */
    }
    
    .nav-link {
        border-width: 2px;
    }
}