:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --light-bg: #f5f7ff;
    --dark-bg: #111827;
    --text-dark: #1f2937;
    --text-light: #f9fafb;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body {
    line-height: 1.6;
    color: var(--text-dark);
    background-color: #ffffff;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo-icon {
    margin-right: 10px;
    font-size: 28px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--primary-color);
}

.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-light);
    padding: 160px 0 100px;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 20px;
    max-width: 700px;
    margin: 0 auto 40px;
}

.btn {
    display: inline-block;
    background-color: #ffffff;
    color: var(--primary-color);
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid #ffffff;
    color: #ffffff;
    margin-left: 15px;
}

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

section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

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

.section-title p {
    font-size: 18px;
    color: #6b7280;
    max-width: 700px;
    margin: 0 auto;
}

.services {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.service-card {
    background-color: #ffffff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.service-icon {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--light-bg);
    color: var(--primary-color);
    font-size: 36px;
}

.service-content {
    padding: 30px;
}

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

.service-content p {
    color: #6b7280;
    margin-bottom: 20px;
}

.service-content a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
}

.service-content a:hover {
    text-decoration: underline;
}

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

.process-steps {
    display: flex;
    justify-content: space-between;
    margin-top: 50px;
    flex-wrap: wrap;
}

.step {
    flex: 1;
    min-width: 200px;
    text-align: center;
    padding: 0 20px;
    position: relative;
}

.step-number {
    background-color: var(--primary-color);
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    margin: 0 auto 20px;
}

.step h3 {
    margin-bottom: 15px;
    font-size: 20px;
}

.step p {
    color: #6b7280;
}

.step::after {
    content: '';
    position: absolute;
    top: 30px;
    right: -50%;
    width: 100%;
    height: 2px;
    background-color: #e5e7eb;
    z-index: -1;
}

.step:last-child::after {
    display: none;
}

.cases {
    text-align: center;
}

.case-studies {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.case-card {
    background-color: #ffffff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.case-image {
    height: 200px;
    background-color: #e5e7eb;
    background-size: cover;
    background-position: center;
}

.case-content {
    padding: 25px;
    text-align: left;
}

.case-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.case-content p {
    color: #6b7280;
    margin-bottom: 15px;
}

.case-content .tag {
    display: inline-block;
    background-color: var(--light-bg);
    color: var(--primary-color);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    margin-right: 8px;
    margin-bottom: 8px;
}

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

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 50px;
}

.contact-info h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

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

.contact-icon {
    color: var(--accent-color);
    font-size: 24px;
    margin-right: 15px;
    margin-top: 5px;
}

.contact-text h4 {
    font-size: 18px;
    margin-bottom: 5px;
}

.contact-text p, .contact-text a {
    color: #9ca3af;
    text-decoration: none;
}

.contact-text a:hover {
    color: var(--accent-color);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 20px;
    border: 1px solid #374151;
    background-color: #1f2937;
    border-radius: 5px;
    color: #e5e7eb;
    font-size: 16px;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.contact-form button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s;
}

.contact-form button:hover {
    background-color: var(--primary-color);
}

footer {
    background-color: #0f172a;
    padding: 30px 0;
    color: #9ca3af;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.footer-logo {
    color: var(--text-light);
    font-size: 20px;
    font-weight: 700;
    text-decoration: none;
}

.footer-links {
    display: flex;
    list-style: none;
}

.footer-links li {
    margin-left: 20px;
}

.footer-links a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--text-light);
}

.copyright {
    width: 100%;
    margin-top: 20px;
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 5px 10px;
    }
    
    .hero h1 {
        font-size: 36px;
    }
    
    .step::after {
        display: none;
    }
    
    .process-steps {
        flex-direction: column;
        gap: 30px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        margin-top: 20px;
        justify-content: center;
    }
    
    .footer-links li {
        margin: 0 10px;
    }
}