/* 
 * HDHCGS - GEO 仓储物流官网全局样式
 * 北欧极简风格 | 纯白 + 原木色
 * 精细定制 | 拒绝模板化
 */

/* ==================== CSS Reset & Base ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: #ffffff;
    color: #333333;
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
    list-style: none;
}

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

/* ==================== 颜色变量 ==================== */
:root {
    --color-primary: #C4A574;        /* 原木色主色 */
    --color-primary-light: #D4B88A;  /* 原木色浅 */
    --color-primary-dark: #A68B5B;   /* 原木色深 */
    --color-white: #FFFFFF;          /* 纯白 */
    --color-off-white: #F9F9F7;      /* 米白背景 */
    --color-gray-light: #E8E8E8;     /* 浅灰分割线 */
    --color-gray: #888888;           /* 中灰文字 */
    --color-gray-dark: #555555;      /* 深灰文字 */
    --color-black: #222222;          /* 近黑 */
    --shadow-soft: 0 4px 20px rgba(0,0,0,0.06);
    --shadow-medium: 0 8px 30px rgba(0,0,0,0.08);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== 顶部导航栏 ==================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: var(--transition-base);
    border-bottom: 1px solid rgba(255,255,255,0.3);
}

.site-header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--color-gray-light);
    box-shadow: var(--shadow-soft);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-black);
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 10px 20px;
    font-size: 15px;
    color: var(--color-gray-dark);
    font-weight: 500;
    letter-spacing: 0.5px;
    border-radius: 4px;
    transition: var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: rgba(196, 165, 116, 0.08);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 8px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 60%;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--color-black);
    transition: var(--transition-base);
}

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

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

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

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--color-white);
    padding: 20px 40px;
    box-shadow: var(--shadow-medium);
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition-base);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-nav-link {
    display: block;
    padding: 15px 0;
    font-size: 16px;
    color: var(--color-gray-dark);
    border-bottom: 1px solid var(--color-gray-light);
}

.mobile-nav-link:last-child {
    border-bottom: none;
}

/* ==================== 页脚 ==================== */
.site-footer {
    background: var(--color-off-white);
    padding: 80px 0 40px;
    border-top: 1px solid var(--color-gray-light);
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 60px;
    margin-bottom: 60px;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.footer-section p {
    font-size: 14px;
    color: var(--color-gray);
    line-height: 2;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--color-gray);
    transition: var(--transition-base);
}

.footer-links a:hover {
    color: var(--color-primary);
    padding-left: 5px;
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--color-gray);
    margin-bottom: 12px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid var(--color-gray-light);
}

.copyright {
    font-size: 13px;
    color: var(--color-gray);
}

.footer-nav {
    display: flex;
    gap: 30px;
}

.footer-nav a {
    font-size: 13px;
    color: var(--color-gray);
}

.footer-nav a:hover {
    color: var(--color-primary);
}

/* ==================== 通用组件 ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 36px;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.section-title p {
    font-size: 16px;
    color: var(--color-gray);
    max-width: 600px;
    margin: 0 auto;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 1px;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-base);
    border: none;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

/* 卡片样式 */
.card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-light);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition-base);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--color-primary-light);
}

.card-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.card-content {
    padding: 24px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-black);
    margin-bottom: 12px;
}

.card-text {
    font-size: 14px;
    color: var(--color-gray);
    line-height: 1.8;
    margin-bottom: 16px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--color-gray);
}

/* 网格布局 */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

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

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

/* 动画效果 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

@media (max-width: 992px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section {
        padding: 80px 0;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
    }
    
    .container {
        padding: 0 20px;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .section-title h2 {
        font-size: 28px;
    }
    
    .section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .logo-text {
        font-size: 20px;
    }
    
    .btn {
        padding: 12px 28px;
    }
}