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

body {
    font-family: 'Microsoft YaHei', 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

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

.logo h1 {
    color: white;
    font-size: 1.8rem;
    font-weight: bold;
}

.logo i {
    margin-right: 10px;
    color: #f39c12;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #f39c12;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: #f39c12;
    transition: width 0.3s ease;
}

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

.nav-link.active {
    color: #f39c12;
}

.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

main {
    margin-top: 80px;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0;
    display: flex;
    align-items: center;
    min-height: 80vh;
}

.hero-content {
    flex: 1;
    padding-right: 2rem;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    cursor: pointer;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: #f39c12;
    color: white;
}

.btn-primary:hover {
    background: #e67e22;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(243, 156, 18, 0.4);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image i {
    font-size: 20rem;
    opacity: 0.1;
}

.about {
    padding: 100px 0;
    background: #f8f9fa;
}

.about h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e3c72;
}

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

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #2a5298;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #666;
}

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

.stat {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.stat:hover {
    transform: translateY(-5px);
}

.stat h4 {
    font-size: 2.5rem;
    color: #f39c12;
    margin-bottom: 0.5rem;
}

.stat p {
    color: #666;
    font-weight: 500;
}

.about-image {
    text-align: center;
}

.about-image i {
    font-size: 15rem;
    color: #1e3c72;
    opacity: 0.1;
}

.services {
    padding: 100px 0;
}

.services h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e3c72;
}

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

.service-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border-top: 4px solid #f39c12;
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.service-card.featured {
    border-top-color: #c41e3a;
    background: linear-gradient(135deg, #fff9f0 0%, #ffffff 100%);
}

.featured-badge {
    position: absolute;
    top: 15px;
    right: -30px;
    background: #c41e3a;
    color: white;
    padding: 8px 40px;
    font-size: 0.9rem;
    font-weight: bold;
    transform: rotate(45deg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.service-card.featured .service-icon i {
    color: #c41e3a;
}

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

.service-icon i {
    font-size: 3rem;
    color: #f39c12;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #1e3c72;
    text-align: center;
}

.service-card p {
    color: #666;
    margin-bottom: 1.5rem;
    text-align: center;
}

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

.service-card li {
    padding: 0.5rem 0;
    color: #666;
    position: relative;
    padding-left: 1.5rem;
}

.service-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #f39c12;
    font-weight: bold;
}

.cases {
    padding: 100px 0;
    background: #f8f9fa;
}

.cases h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e3c72;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.case-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.case-info h3 {
    font-size: 1.3rem;
    color: #1e3c72;
    margin-bottom: 0.5rem;
}

.case-detail {
    color: #f39c12;
    font-weight: bold;
    margin-bottom: 1rem;
}

.case-description {
    color: #666;
    line-height: 1.6;
}

.contact {
    padding: 100px 0;
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e3c72;
}

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

.contact-info h3,
.contact-form h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    color: #2a5298;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.contact-item i {
    color: #f39c12;
    margin-right: 1rem;
    width: 20px;
}

.contact-item span {
    color: #666;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #f39c12;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

footer {
    background: #1e3c72;
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: #f39c12;
}

.footer-section p {
    color: #ccc;
    margin-bottom: 0.5rem;
}

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

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

.footer-section ul li a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #f39c12;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: #f39c12;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #2a5298;
    color: #ccc;
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: #1e3c72;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.05);
        padding: 2rem 0;
    }

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

    .hamburger {
        display: flex;
    }

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

    .hamburger.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero {
        flex-direction: column;
        text-align: center;
        padding: 50px 0;
    }

    .hero-content {
        padding-right: 0;
        margin-bottom: 2rem;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-image i {
        font-size: 10rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

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

    .hero-buttons {
        justify-content: center;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1.1rem;
    }

    .about h2,
    .services h2,
    .cases h2,
    .contact h2 {
        font-size: 2rem;
    }

    .service-card,
    .case-card {
        padding: 1.5rem;
    }

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

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.success-message {
    background: #d4edda;
    color: #155724;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid #c3e6cb;
    display: none;
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 1px solid #f5c6cb;
    display: none;
}