/* 
 * 金汇商贸 - 高端定制营销型官网样式
 * 咖啡Ins风 | 奶白 + 浅棕 + 浅蓝配色
 * 斜切分区固定布局
 */

/* ==================== CSS变量定义 ==================== */
:root {
    --color-cream: #FDF8F3;
    --color-cream-dark: #F5EBE0;
    --color-brown-light: #D4B996;
    --color-brown: #A67C52;
    --color-brown-dark: #8B6914;
    --color-blue-light: #B8D4E3;
    --color-blue: #8FB8DE;
    --color-blue-dark: #6B9AC4;
    --color-text: #4A4A4A;
    --color-text-light: #7A7A7A;
    --color-white: #FFFFFF;
    --color-shadow: rgba(166, 124, 82, 0.15);
    
    --font-primary: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-secondary: Georgia, serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    --transition-fast: 0.3s ease;
    --transition-normal: 0.5s ease;
    --transition-slow: 0.8s ease;
    
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
}

/* ==================== 全局重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-cream);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-fast);
}

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

ul, ol {
    list-style: none;
}

/* ==================== 布局容器 ==================== */
.layout-container {
    display: flex;
    min-height: 100vh;
}

/* ==================== 左侧固定导航 ==================== */
.sidebar-nav {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: linear-gradient(180deg, var(--color-cream) 0%, var(--color-cream-dark) 100%);
    border-right: 1px solid var(--color-brown-light);
    padding: var(--spacing-md);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.logo-section {
    text-align: center;
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-brown-light);
}

.logo {
    font-family: var(--font-secondary);
    font-size: 2rem;
    font-weight: bold;
    color: var(--color-brown-dark);
    letter-spacing: 2px;
}

.logo img {
    width: 120px;
    height: 60px;
    margin: 0 auto var(--spacing-sm);
    object-fit: contain;
}

.nav-menu {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--spacing-xs);
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    font-size: 1rem;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--color-blue-light), transparent);
    transition: width var(--transition-normal);
    z-index: -1;
}

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

.nav-link:hover {
    color: var(--color-brown-dark);
    transform: translateX(5px);
}

.nav-link.active {
    background: var(--color-blue-light);
    color: var(--color-brown-dark);
    font-weight: 600;
}

.nav-icon {
    margin-right: var(--spacing-sm);
    font-size: 1.2rem;
}

/* 页脚联系信息 */
.sidebar-footer {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-brown-light);
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.contact-info p {
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* ==================== 右侧主内容区 ==================== */
.main-content {
    margin-left: 280px;
    flex: 1;
    min-height: 100vh;
}

/* ==================== 斜切区块样式 ==================== */
.skew-section {
    position: relative;
    padding: var(--spacing-xl) var(--spacing-lg);
    overflow: hidden;
}

.skew-section:nth-child(odd) {
    background: var(--color-cream);
    transform: skewY(-2deg);
    transform-origin: top left;
}

.skew-section:nth-child(even) {
    background: var(--color-cream-dark);
    transform: skewY(2deg);
    transform-origin: top right;
}

.skew-section > * {
    transform: skewY(2deg);
}

.skew-section:nth-child(even) > * {
    transform: skewY(-2deg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-family: var(--font-secondary);
    font-size: 2.5rem;
    color: var(--color-brown-dark);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-blue), var(--color-brown));
}

.section-subtitle {
    color: var(--color-text-light);
    font-size: 1.1rem;
    margin-top: var(--spacing-md);
}

/* ==================== Hero Banner ==================== */
.hero-banner {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-blue-light) 100%);
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    background-image: 
        radial-gradient(circle at 20% 80%, var(--color-brown) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, var(--color-blue) 0%, transparent 50%);
}

.hero-content {
    text-align: center;
    z-index: 10;
    padding: var(--spacing-lg);
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-family: var(--font-secondary);
    font-size: 4rem;
    color: var(--color-brown-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    max-width: 800px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-brown), var(--color-brown-dark));
    color: var(--color-white);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--color-shadow);
}

.btn-secondary {
    background: transparent;
    color: var(--color-brown-dark);
    border: 2px solid var(--color-brown);
}

.btn-secondary:hover {
    background: var(--color-brown);
    color: var(--color-white);
}

/* ==================== 卡片样式 ==================== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    max-width: 1400px;
    margin: 0 auto;
}

.card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 5px 20px var(--color-shadow);
    transition: all var(--transition-normal);
    position: relative;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--color-shadow);
}

.card-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.card:hover .card-image img {
    transform: scale(1.1);
}

.card-content {
    padding: var(--spacing-md);
}

.card-title {
    font-size: 1.3rem;
    color: var(--color-brown-dark);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-secondary);
}

.card-text {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--color-text-light);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-cream-dark);
}

.card-link {
    color: var(--color-blue-dark);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.card-link:hover {
    color: var(--color-brown-dark);
}

/* ==================== 服务特色卡片 ==================== */
.service-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 20px var(--color-shadow);
    transition: all var(--transition-normal);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px var(--color-shadow);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--color-blue-light), var(--color-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--color-white);
}

.service-title {
    font-size: 1.4rem;
    color: var(--color-brown-dark);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-secondary);
}

.service-desc {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ==================== 技术保障列表 ==================== */
.tech-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.tech-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-white);
    border-radius: var(--border-radius-md);
    box-shadow: 0 3px 15px var(--color-shadow);
}

.tech-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-brown-light), var(--color-brown));
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-white);
    flex-shrink: 0;
}

.tech-content h4 {
    color: var(--color-brown-dark);
    margin-bottom: var(--spacing-xs);
    font-size: 1.1rem;
}

.tech-content p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ==================== 案例展示 ==================== */
.case-study {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.case-item {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    height: 350px;
    box-shadow: 0 10px 30px var(--color-shadow);
}

.case-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: linear-gradient(to top, rgba(139, 105, 20, 0.9), transparent);
    color: var(--color-white);
    transform: translateY(80px);
    transition: transform var(--transition-normal);
}

.case-item:hover .case-image {
    transform: scale(1.1);
}

.case-item:hover .case-overlay {
    transform: translateY(0);
}

.case-category {
    font-size: 0.85rem;
    color: var(--color-blue-light);
    margin-bottom: var(--spacing-xs);
}

.case-title {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-secondary);
}

.case-desc {
    font-size: 0.9rem;
    opacity: 0.9;
    line-height: 1.5;
}

/* ==================== 联系表单 ==================== */
.contact-form-wrapper {
    max-width: 800px;
    margin: 0 auto;
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 40px var(--color-shadow);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--color-brown-dark);
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-cream-dark);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    font-family: var(--font-primary);
    transition: all var(--transition-fast);
    background: var(--color-cream);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-blue);
    box-shadow: 0 0 0 3px rgba(143, 184, 222, 0.2);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

/* ==================== 页脚 ==================== */
.site-footer {
    background: linear-gradient(135deg, var(--color-brown-dark), var(--color-brown));
    color: var(--color-white);
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto var(--spacing-lg);
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    font-family: var(--font-secondary);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.footer-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--color-blue-light);
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-sm);
    display: block;
    line-height: 1.8;
}

.footer-section a:hover {
    color: var(--color-blue-light);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

/* ==================== 动画效果 ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== 面包屑导航 ==================== */
.breadcrumb {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-cream-dark);
    border-bottom: 1px solid var(--color-brown-light);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    max-width: 1400px;
    margin: 0 auto;
    font-size: 0.9rem;
}

.breadcrumb-item {
    color: var(--color-text-light);
}

.breadcrumb-item a {
    color: var(--color-blue-dark);
}

.breadcrumb-item a:hover {
    color: var(--color-brown-dark);
}

.breadcrumb-item.active {
    color: var(--color-brown-dark);
    font-weight: 600;
}

.breadcrumb-separator {
    color: var(--color-brown-light);
}

/* ==================== 页面标题区 ==================== */
.page-header {
    padding: var(--spacing-xl) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-blue-light) 100%);
    text-align: center;
}

.page-title {
    font-family: var(--font-secondary);
    font-size: 3rem;
    color: var(--color-brown-dark);
    margin-bottom: var(--spacing-sm);
}

.page-description {
    font-size: 1.2rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* ==================== 新闻列表样式 ==================== */
.news-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.news-item {
    display: flex;
    gap: var(--spacing-md);
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 5px 20px var(--color-shadow);
    transition: all var(--transition-normal);
}

.news-item:hover {
    transform: translateX(10px);
    box-shadow: 0 10px 30px var(--color-shadow);
}

.news-thumbnail {
    width: 280px;
    height: 180px;
    flex-shrink: 0;
    overflow: hidden;
}

.news-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.news-item:hover .news-thumbnail img {
    transform: scale(1.1);
}

.news-content {
    flex: 1;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-date {
    font-size: 0.85rem;
    color: var(--color-blue-dark);
    margin-bottom: var(--spacing-xs);
}

.news-title {
    font-size: 1.3rem;
    color: var(--color-brown-dark);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-secondary);
    line-height: 1.4;
}

.news-excerpt {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.news-more {
    color: var(--color-blue-dark);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* ==================== 新闻详情样式 ==================== */
.article-detail {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 20px var(--color-shadow);
}

.article-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-cream-dark);
}

.article-title-detail {
    font-family: var(--font-secondary);
    font-size: 2.5rem;
    color: var(--color-brown-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.article-body {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text);
}

.article-body p {
    margin-bottom: var(--spacing-md);
}

.article-body img {
    margin: var(--spacing-md) 0;
    border-radius: var(--border-radius-md);
}

/* ==================== 相关新闻推荐 ==================== */
.related-news {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-cream-dark);
}

.related-news h3 {
    font-family: var(--font-secondary);
    font-size: 1.8rem;
    color: var(--color-brown-dark);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* ==================== 汉堡菜单（移动端） ==================== */
.hamburger {
    display: none;
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1001;
    width: 50px;
    height: 50px;
    background: var(--color-brown-dark);
    border-radius: 50%;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--color-white);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

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

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .sidebar-nav {
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }
    
    .sidebar-nav.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .skew-section {
        transform: none !important;
    }
    
    .skew-section > * {
        transform: none !important;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .card-grid,
    .tech-list,
    .case-study {
        grid-template-columns: 1fr;
    }
    
    .news-item {
        flex-direction: column;
    }
    
    .news-thumbnail {
        width: 100%;
        height: 200px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
    }
    
    .contact-form-wrapper {
        padding: var(--spacing-md);
    }
}

/* ==================== 工具类 ==================== */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.hidden {
    display: none;
}