/* ========================================
   LeHub Agence - 高端建站品牌官网
   汽车改装风格：亮黑 + 亮红 + 银灰
   对角分割非对称布局
   ======================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background-color: #0a0a0a;
    color: #e0e0e0;
    line-height: 1.6;
    overflow-x: hidden;
}

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 {
    --bright-black: #0a0a0a;
    --deep-black: #1a1a1a;
    --bright-red: #ff1a1a;
    --deep-red: #cc0000;
    --silver-gray: #c0c0c0;
    --light-gray: #808080;
    --white: #ffffff;
    --gradient-red: linear-gradient(135deg, #ff1a1a 0%, #cc0000 100%);
    --gradient-dark: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
}

/* ========================================
   导航栏样式
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 2px solid var(--bright-red);
    transition: all 0.4s ease;
    padding: 15px 0;
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.98);
    box-shadow: 0 4px 20px rgba(255, 26, 26, 0.3);
}

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

.nav-logo {
    font-size: 28px;
    font-weight: 800;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 3px;
    position: relative;
}

.nav-logo span {
    color: var(--bright-red);
}

.nav-logo::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--gradient-red);
}

.nav-menu {
    display: flex;
    gap: 35px;
}

.nav-link {
    color: var(--silver-gray);
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    padding: 8px 0;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-red);
    transition: width 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--white);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--bright-red);
    transition: all 0.3s ease;
}

.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);
}

/* ========================================
   页脚样式
   ======================================== */
.footer {
    background: var(--deep-black);
    border-top: 3px solid var(--bright-red);
    padding: 60px 0 30px;
    margin-top: 100px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: var(--white);
    font-size: 18px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--bright-red);
}

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

.footer-section ul li a:hover {
    color: var(--bright-red);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--light-gray);
    color: var(--silver-gray);
    font-size: 13px;
}

/* ========================================
   首页 Banner - 对角分割
   ======================================== */
.hero-banner {
    min-height: 100vh;
    display: flex;
    position: relative;
    overflow: hidden;
    background: var(--bright-black);
    padding-top: 80px;
}

.hero-diagonal {
    position: absolute;
    top: 0;
    right: 0;
    width: 55%;
    height: 100%;
    background: linear-gradient(135deg, var(--deep-black) 0%, var(--bright-black) 100%);
    clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
    z-index: 1;
}

.hero-image-wrapper {
    position: absolute;
    top: 0;
    right: 0;
    width: 55%;
    height: 100%;
    z-index: 2;
    overflow: hidden;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
    transform: scale(1.1);
    animation: heroZoom 20s infinite alternate;
}

@keyframes heroZoom {
    from { transform: scale(1.1); }
    to { transform: scale(1.2); }
}

.hero-content {
    position: relative;
    z-index: 3;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 80px;
}

.hero-badge {
    display: inline-block;
    background: var(--gradient-red);
    color: var(--white);
    padding: 8px 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 20px;
    width: fit-content;
    clip-path: polygon(10px 0, 100% 0, 100% 100%, 0 100%, 0 10px);
}

.hero-title {
    font-size: 56px;
    font-weight: 900;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 25px;
    text-transform: uppercase;
}

.hero-title span {
    color: var(--bright-red);
    display: block;
}

.hero-description {
    color: var(--silver-gray);
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.btn {
    padding: 15px 40px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
    clip-path: polygon(10px 0, 100% 0, 100% 100%, 0 100%, 0 10px);
}

.btn-primary {
    background: var(--gradient-red);
    color: var(--white);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 26, 26, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--bright-red);
}

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

/* ========================================
   核心服务板块 - 对角卡片
   ======================================== */
.services-section {
    padding: 120px 0;
    background: var(--deep-black);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-tag {
    display: inline-block;
    color: var(--bright-red);
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 15px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--white);
    text-transform: uppercase;
    margin-bottom: 20px;
}

.section-line {
    width: 80px;
    height: 4px;
    background: var(--gradient-red);
    margin: 0 auto;
}

.services-grid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--bright-black);
    padding: 40px 30px;
    position: relative;
    overflow: hidden;
    transition: all 0.4s ease;
    border-left: 3px solid transparent;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 26, 26, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    border-left-color: var(--bright-red);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-red);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.service-icon svg {
    width: 30px;
    height: 30px;
    fill: var(--white);
}

.service-card h3 {
    color: var(--white);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.service-card p {
    color: var(--silver-gray);
    font-size: 14px;
    line-height: 1.8;
}

/* ========================================
   案例展示 - 错位布局
   ======================================== */
.cases-section {
    padding: 120px 0;
    background: var(--bright-black);
}

.cases-grid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.case-item {
    position: relative;
    overflow: hidden;
    background: var(--deep-black);
}

.case-item:nth-child(even) {
    transform: translateY(40px);
}

.case-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 30px;
    background: linear-gradient(to top, rgba(10, 10, 10, 0.95), transparent);
}

.case-category {
    color: var(--bright-red);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.case-title {
    color: var(--white);
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
}

.case-link {
    color: var(--silver-gray);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.case-link::after {
    content: '→';
    color: var(--bright-red);
    font-size: 18px;
    transition: transform 0.3s ease;
}

.case-item:hover .case-link::after {
    transform: translateX(5px);
}

/* ========================================
   新闻资讯 - 列表样式
   ======================================== */
.news-section {
    padding: 120px 0;
    background: var(--deep-black);
}

.news-grid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.news-card {
    background: var(--bright-black);
    overflow: hidden;
    transition: all 0.4s ease;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

.news-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-content {
    padding: 25px;
}

.news-date {
    color: var(--bright-red);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 10px;
}

.news-title {
    color: var(--white);
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.5;
}

.news-excerpt {
    color: var(--silver-gray);
    font-size: 13px;
    line-height: 1.7;
    margin-bottom: 15px;
}

.news-more {
    color: var(--bright-red);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ========================================
   通用页面头部
   ======================================== */
.page-header {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--bright-black);
    padding-top: 80px;
    overflow: hidden;
}

.page-header-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
}

.page-header-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 40px;
}

.page-header h1 {
    font-size: 48px;
    font-weight: 900;
    color: var(--white);
    text-transform: uppercase;
    margin-bottom: 20px;
}

.page-header p {
    color: var(--silver-gray);
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    font-size: 14px;
}

.breadcrumb a {
    color: var(--silver-gray);
}

.breadcrumb a:hover {
    color: var(--bright-red);
}

.breadcrumb span {
    color: var(--bright-red);
}

/* ========================================
   内容区域通用
   ======================================== */
.content-section {
    padding: 100px 0;
    background: var(--bright-black);
}

.content-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bright-black);
        flex-direction: column;
        padding: 40px;
        transition: left 0.4s ease;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-diagonal,
    .hero-image-wrapper {
        width: 100%;
        clip-path: none;
    }
    
    .hero-content {
        padding: 40px 20px;
    }
    
    .services-grid,
    .cases-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .case-item:nth-child(even) {
        transform: translateY(0);
    }
}

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

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

/* ========================================
   滚动条样式
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bright-black);
}

::-webkit-scrollbar-thumb {
    background: var(--bright-red);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--deep-red);
}