/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;

    /* 防止页面内容被固定导航栏遮挡（导航栏高度为 64px） */
    padding-top: 130px;
}

/* Utility Classes */
.container {
    max-width: 3600px; /* 把最大宽度从 1200px 增大到 1600px，让页面内容区域更宽 */
    margin: 0 auto; /* 水平居中显示 */
    padding: 0 3rem; /* 增大左右内边距，让内容离边缘更远，页面看起来更宽松 */
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mb-2 {
    margin-bottom: 0.5rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mb-6 {
    margin-bottom: 1.5rem;
}

.mb-8 {
    margin-bottom: 2rem;
}

.py-8 {
    padding: 2rem 0;
}

.py-12 {
    padding: 3rem 0;
}

.py-16 {
    padding: 4rem 0;
}

.py-20 {
    padding: 5rem 0;
}

/* Header Styles */
.main-header {
    background-color: rgba(37, 99, 235, 0.8); /* 半透明蓝色背景，对应 #2563eb */
    color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;          /* 固定在页面顶部 */
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: white;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: #fb923c;
}

.logo-subtitle {
    margin-left: 0.5rem;
    font-size: 0.875rem;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
}

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

.nav-menu a:hover {
    color: #fdba74;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: 0.5rem;
}

.language-switcher a {
    color: white;
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    transition: background-color 0.3s;
}

.language-switcher a:hover,
.language-switcher a.current {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 滚动后导航栏背景变不透明 + 阴影增强 */
.main-header.scrolled {
    background-color: rgba(37, 99, 235, 0.95); /* 更不透明 */
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.2); /* 可选：增强阴影 */
}

/* Hero Section */
.hero-section {
    height: 500px;
    background-image: url('https://lekeers.com/wp-content/uploads/2025/09/集运主页-1.jpg') !important;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: #93c5fd;
}

.hero-description {
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.9;
}