/* 基础重置和变量 */
:root {
    --primary-color: #0056b3;
    --primary-hover: #004494;
    --text-main: #333333;
    --text-light: #666666;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #e5e5e5;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 10px 20px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--bg-white);
}

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

ul {
    list-style: none;
}

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

/* 公用工具类 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 80px 0;
}

.bg-light {
    background-color: var(--bg-light);
}

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

.section-title {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.section-header p {
    color: var(--text-light);
    font-size: 16px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

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

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

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

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background-color: transparent;
}

.navbar.scrolled {
    background-color: var(--bg-white);
    box-shadow: var(--shadow);
    padding: 15px 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--bg-white);
    transition: var(--transition);
}

.navbar.scrolled .logo {
    color: var(--primary-color);
}

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

.nav-links a {
    color: rgba(255, 255, 255, 0.9);
    font-size: 16px;
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--bg-white);
}

.navbar.scrolled .nav-links a {
    color: var(--text-main);
}

.navbar.scrolled .nav-links a:hover {
    color: var(--primary-color);
}

/* 首页 Banner */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    color: var(--bg-white);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 86, 179, 0.6));
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    max-width: 800px;
}

.hero-content h1 {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

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

/* 企业优势 */
.features {
    margin-top: -60px;
    position: relative;
    z-index: 10;
    padding-top: 0;
}

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

.feature-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

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

.feature-card .icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--text-light);
    font-size: 14px;
}

/* 关于公司 */
.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image img {
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.about-content h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--text-main);
}

.about-content p {
    color: var(--text-light);
    margin-bottom: 30px;
}

.history ul {
    border-left: 2px solid var(--primary-color);
    padding-left: 20px;
    margin-top: 20px;
}

.history li {
    margin-bottom: 15px;
    position: relative;
    color: var(--text-light);
}

.history li::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 6px;
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 50%;
}

.history strong {
    color: var(--text-main);
}

/* 产品服务 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--bg-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.service-card img {
    width: 100%;
    height: 240px;
    object-fit: cover;
}

.service-info {
    padding: 30px;
}

.service-info h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-main);
}

.service-info p {
    color: var(--text-light);
    font-size: 15px;
}

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

.case-card {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    height: 300px;
}

.case-img {
    height: 100%;
}

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

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(transparent, rgba(0, 86, 179, 0.9));
    color: var(--bg-white);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 30px;
    opacity: 0;
    transition: var(--transition);
}

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

.case-card:hover .case-overlay {
    opacity: 1;
}

.case-overlay h3 {
    font-size: 20px;
    margin-bottom: 5px;
}

.case-overlay p {
    font-size: 14px;
    opacity: 0.9;
}

/* 新闻资讯 */
.news-list {
    max-width: 800px;
    margin: 0 auto;
}

.news-item {
    display: flex;
    gap: 30px;
    padding: 30px;
    background: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    transition: var(--transition);
}

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

.news-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 80px;
    height: 80px;
    background: var(--primary-color);
    color: var(--bg-white);
    border-radius: 8px;
}

.news-date .day {
    font-size: 28px;
    font-weight: 700;
    line-height: 1;
}

.news-date .month {
    font-size: 14px;
    margin-top: 5px;
}

.news-content h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.news-content h3 a:hover {
    color: var(--primary-color);
}

.news-content p {
    color: var(--text-light);
    font-size: 14px;
}

/* 联系我们 */
.contact-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    background: var(--bg-white);
    padding: 50px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

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

.info-item:last-child {
    margin-bottom: 0;
}

.info-icon {
    font-size: 24px;
    width: 50px;
    height: 50px;
    background: var(--bg-light);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.info-text h4 {
    font-size: 18px;
    margin-bottom: 5px;
    color: var(--text-main);
}

.info-text p {
    color: var(--text-light);
}

.qrcode-box {
    text-align: center;
}

.qrcode-box img {
    width: 200px;
    height: 200px;
    margin: 0 auto 15px;
    border: 1px solid var(--border-color);
    padding: 10px;
}

.qrcode-box p {
    color: var(--text-light);
    font-size: 14px;
}

/* 底部 Footer */
.footer {
    background-color: #222;
    color: #ccc;
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    border-bottom: 1px solid #444;
    padding-bottom: 40px;
}

.footer-brand h2 {
    color: var(--bg-white);
    font-size: 24px;
    margin-bottom: 5px;
}

.footer-bottom {
    text-align: center;
    font-size: 14px;
}

/* 动画类 */
.fade-in {
    opacity: 0;
    transition: opacity 1s ease;
}

.fade-in.visible {
    opacity: 1;
}

.slide-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }
.delay-3 { transition-delay: 0.6s; }

.nav-download-btn {
    background: var(--primary-color);
    color: #ffffff !important;
    padding: 8px 18px;
    border-radius: 20px;
    margin-left: 10px;
    font-weight: 600;
}

.nav-download-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.nav-right-mobile {
    display: none;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .about-container {
        grid-template-columns: 1fr;
    }
    .services-grid, .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .contact-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-right-mobile {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .mobile-download-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        background: linear-gradient(135deg, #0056b3, #00c6ff);
        color: #ffffff !important;
        font-size: 13px;
        font-weight: 600;
        padding: 6px 14px;
        border-radius: 20px;
        box-shadow: 0 4px 12px rgba(0, 86, 179, 0.35);
    }

    .mobile-menu-toggle {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        width: 28px;
        height: 20px;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: 0;
        z-index: 1001;
    }

    .mobile-menu-toggle span {
        width: 100%;
        height: 3px;
        background-color: #ffffff;
        border-radius: 3px;
        transition: all 0.3s ease;
    }

    .navbar.scrolled .mobile-menu-toggle span {
        background-color: var(--text-main);
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: translateY(8.5px) rotate(45deg);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: translateY(-8.5px) rotate(-45deg);
    }

    .nav-links {
        position: fixed;
        top: 65px;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 25px 20px;
        gap: 16px;
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12);
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-150%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        text-align: center;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-links a {
        color: var(--text-main) !important;
        font-size: 17px;
        font-weight: 600;
        display: block;
        padding: 8px 0;
    }

    .hero-content h1 {
        font-size: 34px;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 12px;
    }

    .hero-buttons .btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }

    .features-grid, .services-grid, .cases-grid {
        grid-template-columns: 1fr;
    }

    .features {
        margin-top: 20px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
}