:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #0f766e;
    --accent: #f59e0b;
    --dark: #1e293b;
    --gray-600: #475569;
    --gray-400: #94a3b8;
    --gray-200: #e2e8f0;
    --gray-100: #f1f5f9;
    --white: #ffffff;
    --bg-light: #f8fafc;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --radius: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: 'Playfair Display', serif;
    line-height: 1.2;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    text-decoration: none;
    color: inherit;
}

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

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
}

.logo-text {
    font-family: 'Playfair Display', serif;
    font-size: 22px;
    font-weight: 600;
    color: var(--dark);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-600);
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--dark);
    transition: var(--transition);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-full {
    width: 100%;
}

.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    border-radius: 50px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 18px;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #e0f2fe 0%, #dbeafe 50%, #eff6ff 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: linear-gradient(135deg, transparent 0%, rgba(37, 99, 235, 0.05) 100%);
    border-radius: 50%;
}

.hero-content {
    text-align: center;
    padding: 60px 0;
}

.hero-title {
    font-size: 64px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 24px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
    font-family: 'Playfair Display', serif;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.services {
    background: var(--white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.service-card {
    padding: 40px 32px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--gray-200);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.service-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.service-icon svg {
    width: 28px;
    height: 28px;
    color: var(--white);
}

.service-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.7;
}

.why-china {
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 32px 24px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--gray-200);
    font-family: 'Playfair Display', serif;
    margin-bottom: 16px;
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
}

.process {
    background: var(--white);
}

.process-steps {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.process-steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 24px;
    width: 2px;
    height: calc(100% - 80px);
    background: var(--gray-200);
}

.process-step {
    display: flex;
    gap: 32px;
    margin-bottom: 48px;
    position: relative;
}

.process-step:last-child {
    margin-bottom: 0;
}

.step-number {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.step-content {
    padding-top: 4px;
}

.step-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

.step-desc {
    font-size: 16px;
    color: var(--gray-600);
    line-height: 1.7;
}

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

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.testimonial-card {
    padding: 40px 32px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.testimonial-rating {
    color: var(--accent);
    font-size: 18px;
    margin-bottom: 16px;
}

.testimonial-text {
    font-size: 16px;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 24px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.author-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
}

.author-country {
    font-size: 14px;
    color: var(--gray-400);
}

.contact {
    background: var(--white);
}

.contact-info-centered {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-info-centered .section-tag {
    margin-bottom: 8px;
}

.contact-info-centered .section-title {
    text-align: center;
    margin-bottom: 16px;
}

.contact-desc {
    font-size: 16px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 40px;
}

.contact-details {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: center;
}

.contact-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon svg {
    width: 22px;
    height: 22px;
    color: var(--primary);
}

.contact-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: left;
}

.contact-label {
    font-size: 13px;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-value {
    font-size: 16px;
    color: var(--dark);
    font-weight: 500;
}

a.contact-value:hover {
    color: var(--primary);
}

.footer {
    background: var(--dark);
    color: var(--white);
    padding: 80px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    margin-bottom: 20px;
}

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

.footer-tagline {
    font-size: 15px;
    color: var(--gray-400);
    line-height: 1.7;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    font-family: 'Inter', sans-serif;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col a {
    font-size: 15px;
    color: var(--gray-400);
    transition: var(--transition);
}

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

.footer-bottom {
    padding: 24px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    color: var(--gray-400);
}

@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 40px;
    }

    .hero-subtitle {
        font-size: 17px;
    }

    .hero-stats {
        gap: 40px;
    }

    .stat-number {
        font-size: 36px;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 32px;
    }

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

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

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

    .contact-details {
        flex-direction: column;
        align-items: center;
        gap: 24px;
    }

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

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-cta .btn {
        width: 100%;
        max-width: 280px;
    }
}