/* 全局样式 */
:root {
    --primary-color: #2c5282; /* 深蓝主色调 */
    --secondary-color: #4a5568; /* 灰色辅助色 */
    --accent-color: #e53e3e; /* 红色强调色 */
    --light-bg: #f7fafc; /* 浅灰背景色 */
    --dark-text: #2d3748; /* 深灰文本色 */
    --light-text: #ffffff; /* 白色文本 */
    --border-radius: 6px; /* 圆角 */
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1); /* 阴影 */
    --transition: all 0.3s ease; /* 过渡效果 */
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: #ffffff;
}

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

ul {
    list-style: none;
}

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    position: relative;
    color: var(--primary-color);
}

.section-title::after {
    content: "";
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--accent-color);
    margin: 0.8rem auto;
}

.section-desc {
    text-align: center;
    font-size: 1.1rem;
    color: var(--secondary-color);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
    text-align: center;
    border: none;
    font-size: 1rem;
}

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

.primary-btn:hover {
    background-color: #1a365d;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.secondary-btn:hover {
    background-color: var(--primary-color);
    color: var(--light-text);
    transform: translateY(-2px);
}

/* 头部导航 */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 1rem 0;
}

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

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

.logo img {
    max-height: 50px;
}

.main-nav ul {
    display: flex;
    gap: 2rem;
}

.main-nav li {
    position: relative;
}

.main-nav a {
    font-weight: 600;
    color: var(--secondary-color);
    position: relative;
}

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

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

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

.contact-btn {
    background-color: var(--primary-color);
    color: var(--light-text) !important;
    padding: 0.5rem 1.2rem;
    border-radius: var(--border-radius);
}

.contact-btn:hover {
    background-color: #1a365d;
}

.contact-btn::after {
    display: none;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    flex-direction: column;
    gap: 6px;
}

.mobile-menu-toggle span {
    display: block;
    width: 30px;
    height: 3px;
    background-color: var(--dark-text);
    transition: var(--transition);
}

/* 英雄区域 */
.hero {
    padding: 8rem 0 5rem;
    background: linear-gradient(135deg, #f6f9fc 0%, #e6f2ff 100%);
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content {
    max-width: 550px;
}

.hero-content h1 {
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

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

.hero-image {
    text-align: center;
    position: relative;
}

.hero-svg {
    max-width: 100%;
    height: auto;
}

/* 服务项目 */
.services {
    padding: 5rem 0;
    background-color: #ffffff;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
}

.service-card {
    background-color: #ffffff;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
}

.service-card h3 {
    margin-bottom: 1rem;
    font-size: 1.4rem;
    color: var(--primary-color);
}

.service-card p {
    color: var(--secondary-color);
}

/* 我们的优势 */
.advantages {
    padding: 5rem 0;
    background-color: var(--light-bg);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.advantage-item {
    position: relative;
    padding: 2rem;
    background-color: #ffffff;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.advantage-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

.advantage-number {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 2.5rem;
    font-weight: 700;
    opacity: 0.1;
    color: var(--primary-color);
}

.advantage-item h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
    color: var(--primary-color);
}

.advantage-item p {
    color: var(--secondary-color);
}

/* 成功案例 */
.cases {
    padding: 5rem 0;
    background-color: #ffffff;
}

.cases-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.case-card {
    background-color: #ffffff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
}

.case-image {
    height: 200px;
    overflow: hidden;
}

.case-image svg {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.case-content {
    padding: 1.5rem;
}

.case-content h3 {
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
    color: var(--primary-color);
}

.case-content p {
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.case-results {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* 服务流程 */
.process {
    padding: 5rem 0;
    background-color: var(--light-bg);
}

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

.process-step {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    background-color: #ffffff;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.process-step:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

.step-number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--light-text);
    background-color: var(--primary-color);
    border-radius: 50%;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    color: var(--primary-color);
}

.step-content p {
    color: var(--secondary-color);
    font-size: 0.95rem;
}

/* 联系我们 */
.contact {
    padding: 5rem 0;
    background-color: #ffffff;
}

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

.contact-info h3 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.contact-info p {
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.contact-text strong {
    color: var(--dark-text);
}

.contact-form form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--secondary-color);
}

.form-group input,
.form-group textarea {
    padding: 0.8rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.2);
}

.contact-form .btn {
    grid-column: 1 / -1;
    justify-self: start;
    margin-top: 1rem;
}

/* 页脚 */
footer {
    background-color: #1a202c;
    color: #e2e8f0;
    padding: 3rem 0 1rem;
}

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

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-logo p {
    font-size: 0.95rem;
    line-height: 1.6;
}

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

.footer-nav-column h3 {
    margin-bottom: 1.2rem;
    color: #ffffff;
    font-size: 1.1rem;
}

.footer-nav-column ul {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer-nav-column a {
    color: #e2e8f0;
    font-size: 0.95rem;
}

.footer-nav-column a:hover {
    color: #ffffff;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.9rem;
    color: #a0aec0;
}

.footer-icon {
    width: 40px;
    height: 40px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        margin: 0 auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .section-title {
        font-size: 1.8rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav ul {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: #ffffff;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        display: flex;
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        transition: var(--transition);
        transform: translateY(-150%);
        opacity: 0;
        pointer-events: none;
        z-index: 100;
    }
    
    .main-nav.active ul {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .footer-top,
    .footer-nav {
        grid-template-columns: 1fr;
    }
    
    .contact-form form {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .section-title {
        font-size: 1.6rem;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .services-grid,
    .advantages-grid,
    .cases-slider,
    .process-flow {
        gap: 1.5rem;
    }
}