/* 
 * 尧图网站建设 - 高端汽车风样式表
 * 深灰 + 哑光银 + 中国红配色方案
 * 浮动悬浮卡片错位布局
 */

/* ========== CSS Reset & 基础设置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    background-color: #1a1a1a;
    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;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 顶部导航栏 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
    border-bottom: 1px solid transparent;
}

.header.scrolled {
    background: rgba(26, 26, 26, 0.98);
    border-bottom: 1px solid #c41e3a;
    box-shadow: 0 4px 20px rgba(196, 30, 58, 0.2);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1400px;
    margin: 0 auto;
}

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

.logo img {
    height: 45px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: #e0e0e0;
    letter-spacing: 2px;
}

.logo-text span {
    color: #c41e3a;
}

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

.nav-menu li {
    position: relative;
}

.nav-menu a {
    font-size: 15px;
    font-weight: 500;
    color: #b8b8b8;
    padding: 8px 0;
    position: relative;
    display: inline-block;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #c41e3a, #ff4d5a);
    transition: width 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #ffffff;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

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

.hamburger span {
    width: 28px;
    height: 3px;
    background: #e0e0e0;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.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);
}

/* ========== 页脚 ========== */
.footer {
    background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 100%);
    padding: 60px 0 30px;
    border-top: 2px solid #c41e3a;
    margin-top: 80px;
}

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

.footer-section h4 {
    font-size: 18px;
    color: #ffffff;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: #c41e3a;
}

.footer-section p,
.footer-section li {
    color: #999999;
    font-size: 14px;
    line-height: 2.2;
}

.footer-section a:hover {
    color: #c41e3a;
}

.footer-links li {
    margin-bottom: 8px;
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #333333;
    color: #666666;
    font-size: 14px;
}

/* ========== Hero Banner ========== */
.hero-banner {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
}

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

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(26, 26, 26, 0.8) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    padding: 0 20px;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 20px;
    letter-spacing: 3px;
    animation: fadeInUp 1s ease;
}

.hero-title span {
    color: #c41e3a;
}

.hero-subtitle {
    font-size: 22px;
    color: #b8b8b8;
    margin-bottom: 40px;
    line-height: 1.8;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 1s ease 0.4s both;
}

.btn {
    display: inline-block;
    padding: 15px 40px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #c41e3a 0%, #a01830 100%);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(196, 30, 58, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(196, 30, 58, 0.6);
}

.btn-secondary {
    background: transparent;
    color: #e0e0e0;
    border: 2px solid #c41e3a;
}

.btn-secondary:hover {
    background: #c41e3a;
    color: #ffffff;
}

/* ========== 悬浮卡片错位布局 ========== */
.section {
    padding: 100px 0;
    position: relative;
}

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

.section-title {
    font-size: 42px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 15px;
    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, #c41e3a, #ff4d5a);
}

.section-subtitle {
    font-size: 18px;
    color: #999999;
    margin-top: 25px;
}

/* 错位卡片容器 */
.cards-wrapper {
    position: relative;
    padding: 40px 0;
}

.cards-row {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: -60px;
}

.cards-row.reverse {
    flex-direction: row-reverse;
}

.card {
    background: linear-gradient(145deg, #2a2a2a 0%, #1f1f1f 100%);
    border-radius: 12px;
    padding: 35px;
    width: 380px;
    position: relative;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid #333333;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #c41e3a, #ff4d5a);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 20px 40px rgba(196, 30, 58, 0.25);
    border-color: #c41e3a;
}

.card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #c41e3a 0%, #a01830 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    font-size: 32px;
    color: #ffffff;
}

.card-title {
    font-size: 22px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 15px;
}

.card-text {
    color: #999999;
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.card-link {
    color: #c41e3a;
    font-weight: 600;
    font-size: 15px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.card-link:hover {
    gap: 12px;
}

/* ========== 特性展示区 ========== */
.features-section {
    background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 100%);
    padding: 100px 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.feature-item {
    background: rgba(42, 42, 42, 0.5);
    padding: 30px 25px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid #333333;
    transition: all 0.3s ease;
}

.feature-item:hover {
    background: rgba(196, 30, 58, 0.1);
    border-color: #c41e3a;
    transform: translateY(-8px);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 10px;
}

.feature-desc {
    font-size: 14px;
    color: #888888;
    line-height: 1.6;
}

/* ========== 资讯列表 ========== */
.news-section {
    padding: 100px 0;
}

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

.news-card {
    background: linear-gradient(145deg, #2a2a2a 0%, #1f1f1f 100%);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #333333;
    transition: all 0.4s ease;
}

.news-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(196, 30, 58, 0.2);
    border-color: #c41e3a;
}

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

.news-content {
    padding: 25px;
}

.news-date {
    font-size: 14px;
    color: #c41e3a;
    margin-bottom: 10px;
}

.news-title {
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 12px;
    line-height: 1.5;
}

.news-excerpt {
    font-size: 14px;
    color: #888888;
    line-height: 1.7;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-more {
    color: #c41e3a;
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ========== 页面标题区 ========== */
.page-header {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    margin-top: 80px;
}

.page-header-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.2;
}

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

.page-title {
    font-size: 48px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 15px;
}

.page-subtitle {
    font-size: 18px;
    color: #999999;
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.breadcrumb-list {
    display: flex;
    gap: 10px;
    font-size: 14px;
    color: #888888;
}

.breadcrumb-list a {
    color: #888888;
}

.breadcrumb-list a:hover {
    color: #c41e3a;
}

.breadcrumb-list span {
    color: #c41e3a;
}

/* ========== 内容区域通用样式 ========== */
.content-section {
    padding: 80px 0;
}

.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 动画效果 ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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

/* ========== 响应式设计 ========== */
@media (max-width: 1200px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cards-row {
        flex-wrap: wrap;
    }
}

@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(26, 26, 26, 0.98);
        flex-direction: column;
        justify-content: flex-start;
        padding: 40px 20px;
        gap: 20px;
        transition: left 0.3s ease;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .card {
        width: 100%;
    }
    
    .cards-row {
        margin-bottom: 30px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .page-title {
        font-size: 36px;
    }
}

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

.text-red {
    color: #c41e3a;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.hidden {
    display: none;
}