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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

a {
    text-decoration: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

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

/* ===== 变量定义 ===== */
:root {
    --primary-color: #2a92ff;
    --primary-dark: #1a7ad9;
    --primary-light: #e6f3ff;
    --text-dark: #333;
    --text-light: #666;
    --text-gray: #999;
    --white: #fff;
    --bg-gray: #f5f7fa;
    --border-color: #e1e5eb;
    --shadow: 0 2px 12px rgba(42, 146, 255, 0.1);
    --shadow-hover: 0 8px 24px rgba(42, 146, 255, 0.2);
    --transition: all 0.3s ease;
}

/* ===== 通用容器 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    color: var(--text-dark);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

.section-title p {
    color: var(--text-light);
    font-size: 16px;
    margin-top: 20px;
}

/* ===== 顶部导航 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

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

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

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-text .cn {
    font-size: 18px;
    font-weight: bold;
    color: var(--primary-color);
    line-height: 1.2;
}

.logo-text .en {
    font-size: 10px;
    color: var(--text-gray);
    letter-spacing: 0.5px;
}

.nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    gap: 40px;
}

.nav-list a {
    font-size: 16px;
    color: var(--text-dark);
    padding: 8px 0;
    position: relative;
    transition: var(--transition);
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--primary-color);
}

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

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Banner ===== */
.hero {
    height: 100vh;
    min-height: 600px;
    background: linear-gradient(135deg, rgba(13, 74, 143, 0.85) 0%, rgba(42, 146, 255, 0.85) 50%, rgba(90, 171, 255, 0.85) 100%);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/banner.jpg') center center no-repeat;
    background-size: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(13, 74, 143, 0.8) 0%, rgba(42, 146, 255, 0.7) 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></svg>');
    background-size: 200px 200px;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--white);
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 52px;
    font-weight: bold;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 0.8s ease;
}

.hero-content p {
    font-size: 20px;
    opacity: 0.95;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

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

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

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

/* ===== 关于我们简介 ===== */
.about-preview {
    background: var(--white);
}

.about-preview-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-preview-text h3 {
    font-size: 28px;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.about-preview-text p {
    color: var(--text-light);
    margin-bottom: 15px;
    line-height: 1.8;
}

.about-preview-visual {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 20px;
    padding: 50px;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.about-preview-visual::before {
    content: '';
    position: absolute;
    top: -50px;
    right: -50px;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.about-preview-visual h4 {
    font-size: 32px;
    margin-bottom: 30px;
}

.about-preview-visual ul {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.about-preview-visual li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
}

.about-preview-visual li::before {
    content: '✓';
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    font-size: 14px;
}

/* ===== 服务板块 ===== */
.services-section {
    background: var(--bg-gray);
}

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

.service-card {
    background: var(--white);
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
}

.service-icon svg {
    width: 40px;
    height: 40px;
    fill: var(--white);
}

.service-card h3 {
    font-size: 22px;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.service-card p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.7;
}

/* ===== 案例展示 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.case-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.case-image {
    height: 220px;
    background: linear-gradient(135deg, #e8f4ff 0%, #d0e8ff 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.case-image::before {
    content: '';
    position: absolute;
    top: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    opacity: 0.1;
    border-radius: 50%;
}

.case-image svg {
    width: 80px;
    height: 80px;
    fill: var(--primary-color);
    opacity: 0.5;
}

.case-content {
    padding: 25px;
}

.case-content h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.case-content p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--primary-color);
    font-size: 12px;
    border-radius: 20px;
    margin-top: 12px;
}

/* ===== 页脚 ===== */
.footer {
    background: linear-gradient(135deg, #1a3a5c 0%, #0d2845 100%);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-about h3 {
    font-size: 22px;
    margin-bottom: 20px;
}

.footer-about p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    line-height: 1.8;
}

.footer-section h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.footer-section ul li {
    margin-bottom: 12px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.footer-section ul li i {
    margin-right: 8px;
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* ===== 页面标题栏 ===== */
.page-header {
    background: linear-gradient(135deg, #0d4a8f 0%, #2a92ff 50%, #5aabff 100%);
    padding: 140px 0 60px;
    text-align: center;
    color: var(--white);
}

.page-header h1 {
    font-size: 42px;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
}

/* ===== 服务详情页 ===== */
.service-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding: 60px 0;
}

.service-detail:nth-child(even) {
    direction: rtl;
}

.service-detail:nth-child(even) > * {
    direction: ltr;
}

.service-detail-visual {
    background: linear-gradient(135deg, var(--bg-gray), var(--white));
    border-radius: 20px;
    height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.service-detail-visual svg {
    width: 120px;
    height: 120px;
    fill: var(--primary-color);
    opacity: 0.6;
}

.service-detail-visual::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: -50px;
    width: 150px;
    height: 150px;
    background: var(--primary-color);
    opacity: 0.1;
    border-radius: 50%;
}

.service-detail-content h3 {
    font-size: 32px;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.service-detail-content p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 15px;
}

.service-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 25px;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-dark);
    font-size: 15px;
}

.service-features li::before {
    content: '●';
    color: var(--primary-color);
    font-size: 8px;
}

/* ===== 关于我们页 ===== */
.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-full-text {
    background: var(--white);
    padding: 50px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 50px;
}

.about-full-text h3 {
    font-size: 28px;
    color: var(--text-dark);
    margin-bottom: 25px;
}

.about-full-text p {
    color: var(--text-light);
    line-height: 2;
    margin-bottom: 20px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.stat-item .number {
    font-size: 42px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-item .label {
    color: var(--text-light);
    font-size: 14px;
}

/* ===== 联系我们页 ===== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 20px;
    padding: 50px;
    color: var(--white);
}

.contact-info h3 {
    font-size: 28px;
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
}

.contact-item-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-item-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--white);
}

.contact-item-text h4 {
    font-size: 16px;
    margin-bottom: 5px;
}

.contact-item-text p {
    opacity: 0.9;
    font-size: 15px;
}

.contact-map {
    background: var(--bg-gray);
    border-radius: 20px;
    padding: 50px;
}

.contact-map h3 {
    font-size: 28px;
    color: var(--text-dark);
    margin-bottom: 30px;
}

.map-placeholder {
    height: 300px;
    background: var(--white);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 15px;
    color: var(--text-light);
}

.map-placeholder svg {
    width: 60px;
    height: 60px;
    fill: var(--primary-color);
    opacity: 0.5;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    .nav-list {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-list.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list li a {
        display: block;
        padding: 15px 0;
        border-bottom: 1px solid var(--border-color);
    }
    
    .hero-content h1 {
        font-size: 32px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .hero-btns {
        flex-direction: column;
        align-items: center;
    }
    
    .section {
        padding: 50px 0;
    }
    
    .section-title h2 {
        font-size: 28px;
    }
    
    .about-preview-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .service-detail {
        grid-template-columns: 1fr;
    }
    
    .service-detail:nth-child(even) {
        direction: ltr;
    }
    
    .service-features {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .about-stats {
        grid-template-columns: 1fr 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .page-header h1 {
        font-size: 32px;
    }
    
    .about-preview-visual ul {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .hero {
        min-height: 500px;
    }
    
    .about-preview-visual {
        padding: 30px;
    }
    
    .about-full-text {
        padding: 30px;
    }
    
    .contact-info {
        padding: 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);
}

/* ===== 资质荣誉展示 ===== */
.qualifications-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.qualification-item {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.qualification-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.qualification-item img {
    width: 100%;
    height: auto;
    display: block;
}

.qualification-caption {
    padding: 15px 20px;
    text-align: center;
    font-size: 16px;
    color: var(--text-dark);
    background: var(--white);
    border-top: 3px solid var(--primary-color);
}

/* ===== 人员车辆展示 ===== */
.team-vehicles-image {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.team-vehicles-image img {
    width: 100%;
    height: auto;
    display: block;
}