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

:root {
    --primary-blue: #1e40af;
    --secondary-blue: #3b82f6;
    --light-blue: #60a5fa;
    --lighter-blue: #93c5fd;
    --lightest-blue: #dbeafe;
    --dark-blue: #1e3a8a;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    overflow-x: hidden;
}

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

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo h1 {
    font-size: 24px;
    color: var(--primary-blue);
    font-weight: 700;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

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

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

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

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    transition: all 0.3s ease;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 50%, var(--secondary-blue) 100%);
    overflow: hidden;
}

.hero-content {
    text-align: center;
    color: var(--white);
    z-index: 2;
    padding: 0 20px;
}

.hero-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
    animation: fadeInUp 1s ease;
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><circle cx="200" cy="100" r="150" fill="rgba(255,255,255,0.05)"/><circle cx="800" cy="300" r="200" fill="rgba(255,255,255,0.03)"/><circle cx="1000" cy="150" r="100" fill="rgba(255,255,255,0.04)"/></svg>');
    background-size: cover;
    z-index: 1;
}

.btn-primary {
    display: inline-block;
    padding: 14px 36px;
    background: var(--white);
    color: var(--primary-blue);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
    animation: fadeInUp 1s ease 0.4s both;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

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

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

.underline {
    width: 60px;
    height: 4px;
    background: var(--secondary-blue);
    margin: 0 auto 15px;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--gray-600);
}

.about {
    padding: 100px 0;
    background: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 28px;
    color: var(--dark-blue);
    margin-bottom: 20px;
}

.about-text p {
    color: var(--gray-600);
    margin-bottom: 15px;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: var(--lightest-blue);
    border-radius: 10px;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-600);
}

.about-image .image-placeholder {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.about-image svg {
    width: 100%;
    height: auto;
    display: block;
}

.services {
    padding: 100px 0;
    background: var(--gray-50);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: var(--lightest-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-icon svg {
    width: 40px;
    height: 40px;
}

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

.service-card p {
    color: var(--gray-600);
    line-height: 1.7;
}

.advantages {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
    color: var(--white);
}

.advantages .section-title h2 {
    color: var(--white);
}

.advantages .underline {
    background: var(--white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.advantage-item {
    padding: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.advantage-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.advantage-number {
    font-size: 48px;
    font-weight: 700;
    opacity: 0.3;
    margin-bottom: 15px;
}

.advantage-item h3 {
    font-size: 24px;
    margin-bottom: 15px;
}

.advantage-item p {
    opacity: 0.9;
    line-height: 1.7;
}

.contact {
    padding: 100px 0;
    background: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.info-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.info-icon {
    width: 50px;
    height: 50px;
    background: var(--lightest-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-icon svg {
    width: 24px;
    height: 24px;
}

.info-text h4 {
    font-size: 18px;
    color: var(--dark-blue);
    margin-bottom: 8px;
}

.info-text p {
    color: var(--gray-600);
    line-height: 1.6;
}

.contact-form {
    background: var(--gray-50);
    padding: 40px;
    border-radius: 15px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.contact-form .btn-primary {
    width: 100%;
    background: var(--primary-blue);
    color: var(--white);
    animation: none;
}

.contact-form .btn-primary:hover {
    background: var(--dark-blue);
}

.footer {
    background: var(--gray-900);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo h3 {
    font-size: 24px;
    margin-bottom: 10px;
    color: var(--lighter-blue);
}

.footer-logo p {
    opacity: 0.8;
}

.footer-links h4,
.footer-info h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--lighter-blue);
}

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--lighter-blue);
}

.footer-info p {
    margin-bottom: 8px;
    opacity: 0.8;
    font-size: 14px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
    font-size: 14px;
}

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

.footer-bottom a:hover {
    color: var(--lighter-blue);
    opacity: 1;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 992px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

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

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

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

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: var(--white);
        transition: left 0.3s ease;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    }

    .nav.active {
        left: 0;
    }

    .nav ul {
        flex-direction: column;
        padding: 20px;
        gap: 15px;
    }

    .menu-toggle {
        display: flex;
    }

    .hero-content h2 {
        font-size: 32px;
    }

    .hero-content p {
        font-size: 16px;
    }

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

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

    .section-title h2 {
        font-size: 28px;
    }
}