/* 全局样式 */
:root {
    --primary-color: #2c5282;
    --secondary-color: #4299e1;
    --accent-color: #ebf8ff;
    --text-color: #2d3748;
    --light-text: #718096;
    --border-color: #e2e8f0;
    --white: #ffffff;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5em;
    font-weight: 700;
    line-height: 1.2;
    color: var(--primary-color);
}

p {
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.25rem;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--secondary-color);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

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

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

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

section {
    padding: 5rem 0;
}

/* 头部样式 */
.header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--white);
    box-shadow: var(--box-shadow);
    padding: 1rem 0;
    z-index: 100;
}

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

.logo a {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-svg {
    margin-right: 0.5rem;
}

.main-nav .nav-list {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.main-nav .nav-list a {
    font-weight: 500;
    padding: 0.5rem;
    position: relative;
}

.main-nav .nav-list a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 24px;
    position: relative;
}

.menu-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--primary-color);
    position: absolute;
    transition: var(--transition);
}

.menu-toggle span:nth-child(1) {
    top: 0;
}

.menu-toggle span:nth-child(2) {
    top: 50%;
    transform: translateY(-50%);
}

.menu-toggle span:nth-child(3) {
    bottom: 0;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg);
    top: 11px;
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg);
    bottom: 11px;
}

/* 英雄区域 */
.hero {
    padding: 6rem 0;
    background-color: var(--accent-color);
    background-image: linear-gradient(135deg, var(--accent-color) 0%, #bfdbfe 100%);
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
}

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-size: 2.75rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    color: var(--light-text);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 服务项目 */
.services {
    background-color: var(--white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.service-card {
    background-color: var(--white);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.service-icon {
    margin-bottom: 1.5rem;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.service-features {
    margin-top: 1rem;
}

.service-features li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.5rem;
}

.service-features li::before {
    content: "✓";
    color: var(--secondary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* 优势 */
.advantages {
    background-color: var(--accent-color);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
}

.advantage-item {
    background-color: var(--white);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--box-shadow);
    position: relative;
}

.advantage-number {
    position: absolute;
    top: -1.5rem;
    right: 1rem;
    font-size: 4rem;
    font-weight: 800;
    color: rgba(44, 82, 130, 0.1);
    line-height: 1;
}

.advantage-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* 案例 */
.cases {
    background-color: var(--white);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.case-card {
    background-color: var(--white);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--box-shadow);
    border-left: 4px solid var(--primary-color);
}

.case-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.case-stats {
    display: flex;
    margin-bottom: 1.5rem;
    gap: 2rem;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-desc {
    font-size: 0.875rem;
    color: var(--light-text);
}

/* 流程 */
.process {
    background-color: var(--accent-color);
}

.process-flow {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    position: relative;
}

.process-step {
    background-color: var(--white);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--box-shadow);
    flex: 1;
    min-width: 200px;
    max-width: 250px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
}

.process-step h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

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

.about-content {
    display: flex;
    flex-wrap: wrap;
    gap: 3rem;
}

.about-text {
    flex: 1;
    min-width: 300px;
}

.about-values {
    flex: 1;
    min-width: 300px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.value-item {
    background-color: var(--accent-color);
    padding: 1.5rem;
    border-radius: 8px;
}

.value-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

/* 联系我们 */
.contact {
    background-color: var(--accent-color);
}

.contact-content {
    display: flex;
    flex-wrap: wrap;
    gap: 3rem;
}

.contact-info {
    flex: 1;
    min-width: 300px;
}

.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.contact-method {
    display: flex;
    align-items: center;
    margin-top: 1.5rem;
}

.icon {
    margin-right: 0.75rem;
}

.contact-form {
    flex: 1;
    min-width: 300px;
    background-color: var(--white);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--white);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
}

/* 页脚 */
.footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    flex: 1;
    min-width: 200px;
    max-width: 300px;
}

.footer-logo a {
    color: var(--white);
}

.footer-links {
    flex: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-links-group {
    flex: 1;
    min-width: 150px;
}

.footer-links-group h3 {
    color: var(--white);
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
}

.footer-links-group ul li {
    margin-bottom: 0.75rem;
}

.footer-links-group ul li a {
    color: rgba(255, 255, 255, 0.8);
}

.footer-links-group ul li a:hover {
    color: var(--white);
}

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

.copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .section-title {
        font-size: 2rem;
    }
    
    .hero-content h1 {
        font-size: 2.25rem;
    }
    
    .hero .container {
        flex-direction: column;
    }
    
    .hero-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .nav-list {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        align-items: flex-start;
        padding: 1.5rem;
        box-shadow: var(--box-shadow);
        transform: translateY(-150%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-list.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .section-title {
        font-size: 1.75rem;
        margin-bottom: 2rem;
    }
    
    section {
        padding: 4rem 0;
    }
    
    .hero {
        padding: 4rem 0;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .hero-content h1 {
        font-size: 1.75rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .process-flow {
        flex-direction: column;
        align-items: center;
    }
    
    .process-step {
        width: 100%;
        max-width: 100%;
    }
    
    .advantages-grid,
    .services-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }
}