/* 全局样式 - 科技蓝主题 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #2563eb;
    --dark-blue: #1e40af;
    --light-blue: #3b82f6;
    --sky-blue: #60a5fa;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
}

html {
    scroll-behavior: smooth;
}

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

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-logo img {
    height: 50px;
    width: auto;
    object-fit: contain;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width 0.3s;
}

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

.nav-links a:hover::after {
    width: 100%;
}

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

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: 0.3s;
}

/* 首页横幅 */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    border-radius: 50%;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-left h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 2.5rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.stat {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.stat-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.stat-info h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 0.25rem;
}

.stat-info p {
    font-size: 0.9rem;
    color: var(--text-gray);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-blue);
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.hero-cards {
    display: grid;
    gap: 1.5rem;
}

.service-preview {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: all 0.3s;
}

.service-preview:hover {
    transform: translateX(10px);
    box-shadow: 0 6px 25px rgba(37, 99, 235, 0.15);
}

.service-preview i {
    font-size: 2.5rem;
    color: var(--primary-blue);
}

.service-preview h4 {
    font-size: 1.25rem;
    color: var(--text-dark);
}

/* 通用区块样式 */
section {
    padding: 5rem 0;
}

.section-title-wrapper {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-tag {
    display: inline-block;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-blue);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.section-title-wrapper h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
}

/* 关于我们 */
.about {
    background: var(--bg-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3rem;
}

.company-intro h3 {
    font-size: 1.75rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.company-intro p {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.company-data {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.data-item {
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    color: white;
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
}

.data-item i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.data-item h4 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.data-item p {
    opacity: 0.9;
}

.about-values {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.value-box {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 16px;
    border-left: 4px solid var(--primary-blue);
}

.value-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.value-box h4 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.value-box p {
    color: var(--text-gray);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* 核心业务 */
.services {
    background: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.service-card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.15);
}

.card-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.service-card h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.service-card > p {
    color: var(--text-gray);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.service-card ul {
    list-style: none;
}

.service-card ul li {
    color: var(--text-gray);
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.service-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

/* 服务行业 */
.industries {
    background: white;
    padding: 3rem 0;
}

.industries h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.industry-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.industry-tags span {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-blue);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 企业优势 */
.advantages {
    background: white;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.adv-card {
    position: relative;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 16px;
    transition: all 0.3s;
}

.adv-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--light-blue));
    border-radius: 16px 16px 0 0;
}

.adv-card:hover {
    transform: translateY(-5px);
    background: white;
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
}

.adv-number {
    font-size: 3rem;
    font-weight: 700;
    color: rgba(37, 99, 235, 0.15);
    margin-bottom: 1rem;
}

.adv-card h4 {
    font-size: 1.25rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.adv-card p {
    color: var(--text-gray);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* 资质荣誉 */
.qualifications {
    background: var(--bg-light);
}

.qual-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.qual-item {
    background: white;
    padding: 2.5rem 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s;
}

.qual-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
}

.qual-item i {
    font-size: 3rem;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
}

.qual-item h4 {
    font-size: 1.25rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.qual-item p {
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 联系我们 */
.contact {
    background: white;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.contact-item {
    background: var(--bg-light);
    padding: 2.5rem 2rem;
    border-radius: 16px;
    text-align: center;
}

.contact-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
}

.contact-item h4 {
    font-size: 1.25rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.contact-item p {
    color: var(--text-gray);
}

/* 页脚 */
.footer {
    background: #1f2937;
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo img {
    height: 50px;
    margin-bottom: 1rem;
    filter: brightness(0) invert(1);
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

.footer-links h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links ul li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--dark-blue);
    transform: translateY(-3px);
}

/* 响应式设计 */
@media (max-width: 968px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1rem;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        transition: 0.3s;
    }

    .nav-links.active {
        left: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
    }

    .hero-left h1 {
        font-size: 2.25rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

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

    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .qual-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .hero-left h1 {
        font-size: 1.75rem;
    }

    .section-title-wrapper h2 {
        font-size: 2rem;
    }

    .advantages-grid,
    .qual-grid {
        grid-template-columns: 1fr;
    }

    .company-data {
        grid-template-columns: 1fr;
    }
}