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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

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

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

.navbar {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
}

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

.lang-toggle {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.lang-toggle:hover {
    background-color: var(--primary-dark);
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

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

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--bg-white);
    border-color: var(--bg-white);
}

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

.features {
    padding: 5rem 0;
    background-color: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

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

.feature-card {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
}

.services-preview {
    padding: 5rem 0;
}

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

.service-card {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.service-card:hover {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-lg);
    border-left-width: 6px;
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

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

.stats {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-item {
    padding: 1rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.125rem;
    opacity: 0.95;
}

.footer {
    background-color: var(--text-dark);
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-col h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: white;
}

.footer-col p,
.footer-col a {
    color: #d1d5db;
    line-height: 1.8;
    text-decoration: none;
}

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

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

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

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1.5rem;
    text-align: center;
    color: #9ca3af;
}

.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.125rem;
    opacity: 0.95;
}

.services-detail {
    padding: 4rem 0;
    background-color: var(--bg-light);
}

.service-detail-card {
    background-color: var(--bg-white);
    padding: 2.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
}

.service-detail-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.service-detail-card h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.service-detail-card p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.service-detail-card ul {
    list-style: none;
    padding-left: 0;
}

.service-detail-card ul li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-light);
}

.service-detail-card ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 1.25rem;
}

.cta-section {
    background-color: var(--primary-color);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.cta-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.about-content {
    padding: 4rem 0;
}

.about-intro,
.company-info,
.mission-vision,
.core-values,
.team-section,
.industry-expertise {
    margin-bottom: 3rem;
}

.about-intro h2,
.company-info h2,
.mission-vision h2,
.core-values h2,
.team-section h2,
.industry-expertise h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.about-intro p,
.team-section p,
.industry-expertise p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.info-item {
    padding: 1rem;
    background-color: var(--bg-light);
    border-radius: 8px;
}

.info-item strong {
    color: var(--text-dark);
    display: block;
    margin-bottom: 0.5rem;
}

.info-item span,
.info-item a {
    color: var(--text-light);
}

.mission-vision {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.mv-item {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
}

.mv-item h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.mv-item p {
    color: var(--text-light);
    line-height: 1.8;
}

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

.value-card {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
}

.value-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.value-card p {
    color: var(--text-light);
    line-height: 1.7;
}

.expertise-list {
    list-style: none;
    padding-left: 0;
}

.expertise-list li {
    padding: 1rem;
    margin-bottom: 0.75rem;
    background-color: var(--bg-light);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    color: var(--text-light);
}

.solutions-content {
    padding: 4rem 0;
}

.solution-card {
    background-color: var(--bg-white);
    padding: 2.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    border-top: 4px solid var(--primary-color);
}

.solution-card h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.solution-card p {
    color: var(--text-light);
    line-height: 1.8;
}

.contact-content {
    padding: 4rem 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
}

.contact-info h2,
.contact-form-wrapper h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-radius: 8px;
}

.contact-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.contact-details p,
.contact-details a {
    color: var(--text-light);
    line-height: 1.7;
    text-decoration: none;
}

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

.contact-form {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

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

.form-group textarea {
    resize: vertical;
}

.contact-form button {
    width: 100%;
}

.legal-content {
    padding: 4rem 0;
    background-color: var(--bg-light);
}

.legal-text {
    background-color: var(--bg-white);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    max-width: 900px;
    margin: 0 auto;
}

.legal-text h2 {
    font-size: 1.75rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.legal-text h2:first-child {
    margin-top: 0;
}

.legal-text h3 {
    font-size: 1.25rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.legal-text p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.legal-text ul {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.legal-text ul li {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
        font-size: 0.875rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid,
    .services-grid,
    .stats-grid,
    .values-grid {
        grid-template-columns: 1fr;
    }

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

    .page-header h1 {
        font-size: 2rem;
    }

    .legal-text {
        padding: 2rem;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .hero {
        padding: 4rem 0;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.875rem;
    }
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 3px;
}

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

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--primary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    border: none;
    font-size: 1.5rem;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-5px);
}

.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.fade-in {
    animation: fadeIn 0.6s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--bg-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 5rem 2rem 2rem;
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease;
        gap: 1.5rem;
    }

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

    .nav-menu li {
        width: 100%;
    }

    .nav-link {
        display: block;
        width: 100%;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--border-color);
    }

    .lang-toggle {
        width: 100%;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}