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

:root {
    --primary: #1a365d;
    --primary-light: #2b6cb0;
    --primary-dark: #0d1b2a;
    --accent: #ed8936;
    --accent-light: #f6ad55;
    --text: #2d3748;
    --text-light: #718096;
    --bg: #f7fafc;
    --white: #fff;
    --border: #e2e8f0;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --radius: 12px;
    --gradient: linear-gradient(135deg, #1a365d 0%, #2b6cb0 100%);
    --gradient-accent: linear-gradient(135deg, #ed8936 0%, #dd6b20 100%);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    line-height: 1.6;
    background: var(--white);
}

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

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

img {
    max-width: 100%;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    height: 70px;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo i {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-size: 1rem;
    color: var(--text);
    padding: 8px 0;
    position: relative;
    transition: color 0.3s;
}

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

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

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--primary);
    cursor: pointer;
}

/* ===== Language Switcher ===== */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 20px;
    padding-left: 20px;
    border-left: 1px solid var(--border);
}

.lang-btn {
    padding: 6px 10px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-light);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

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

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 14px 36px;
    background: var(--gradient-accent);
    color: var(--white);
    border-radius: var(--radius);
    font-size: 1.05rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.5px;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(237, 137, 54, 0.4);
}

/* ===== Hero ===== */
.hero {
    background: var(--gradient);
    color: var(--white);
    padding: 180px 0 120px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: rgba(255,255,255,0.03);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: rgba(255,255,255,0.02);
    border-radius: 50%;
}

.hero h1 {
    font-size: 3.2rem;
    margin-bottom: 16px;
    letter-spacing: 3px;
    font-weight: 700;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 12px;
    opacity: 0.95;
    letter-spacing: 1px;
}

.hero-desc {
    font-size: 1.1rem;
    max-width: 650px;
    margin: 0 auto 35px;
    opacity: 0.85;
    line-height: 1.8;
}

/* ===== Section Title ===== */
.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 12px;
    font-weight: 700;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.section-title p {
    color: var(--text-light);
    font-size: 1.15rem;
    margin-top: 16px;
}

/* ===== Services Preview (Home) ===== */
.services-preview {
    padding: 80px 0;
    background: var(--bg);
}

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

.service-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 45px 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

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

.service-card.highlight {
    border-left: 4px solid var(--accent);
}

.service-icon {
    width: 75px;
    height: 75px;
    margin: 0 auto 22px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.9rem;
    transition: transform 0.3s ease;
}

.service-card:hover .service-icon {
    transform: scale(1.1);
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--primary);
    font-weight: 600;
}

.service-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===== About Preview (Home) ===== */
.about-preview {
    padding: 100px 0;
}

.about-content {
    display: flex;
    align-items: center;
    gap: 80px;
}

.about-text {
    flex: 1;
}

.about-text h2 {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 24px;
    font-weight: 700;
}

.about-text p {
    margin-bottom: 18px;
    color: var(--text-light);
    line-height: 1.9;
    font-size: 1.05rem;
}

.about-text .btn {
    margin-top: 15px;
    padding: 14px 36px;
}

.about-stats {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 35px 20px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-light);
    font-size: 1rem;
    font-weight: 500;
}

/* ===== Contact Info (Home) ===== */
.contact-info {
    padding: 80px 0;
    background: var(--gradient);
    color: var(--white);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 50px;
    text-align: center;
}

.contact-item {
    padding: 30px;
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius);
    transition: background 0.3s ease;
}

.contact-item:hover {
    background: rgba(255,255,255,0.12);
}

.contact-item i {
    font-size: 2.2rem;
    color: var(--accent-light);
    margin-bottom: 18px;
}

.contact-item h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.contact-item p {
    opacity: 0.9;
    font-size: 1rem;
    line-height: 1.6;
}

/* ===== Page Header ===== */
.page-header {
    background: var(--gradient);
    color: var(--white);
    padding: 150px 0 70px;
    text-align: center;
}

.page-header h1 {
    font-size: 2.8rem;
    margin-bottom: 14px;
    font-weight: 700;
    letter-spacing: 2px;
}

.page-header p {
    opacity: 0.9;
    font-size: 1.2rem;
    letter-spacing: 1px;
}

/* ===== About Intro ===== */
.about-intro {
    padding: 80px 0;
}

.about-intro-content {
    display: flex;
    align-items: center;
    gap: 60px;
}

.about-intro-text {
    flex: 1;
}

.about-intro-text h2 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 20px;
}

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

.about-intro-image {
    flex: 0 0 400px;
}

.image-placeholder {
    width: 100%;
    height: 300px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.image-placeholder i {
    font-size: 4rem;
    margin-bottom: 15px;
}

.image-placeholder p {
    font-size: 1.3rem;
    font-weight: 600;
}

/* ===== Company Info ===== */
.company-info {
    padding: 80px 0;
    background: var(--bg);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.info-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 30px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

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

.info-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 15px;
    background: var(--bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.5rem;
}

.info-card h3 {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 8px;
}

.info-card p {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

/* ===== Timeline ===== */
.development {
    padding: 80px 0;
}

.timeline {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 40px;
}

.timeline-dot {
    position: absolute;
    left: 12px;
    top: 5px;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--white);
    box-shadow: 0 0 0 2px var(--primary);
}

.timeline-content h3 {
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 8px;
}

.timeline-content p {
    color: var(--text-light);
}

/* ===== Culture ===== */
.culture {
    padding: 80px 0;
    background: var(--bg);
}

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

.culture-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow);
}

.culture-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--accent), #d35400);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2rem;
}

.culture-card h3 {
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 12px;
}

.culture-card p {
    color: var(--text-light);
}

/* ===== Services Detail ===== */
.services-detail {
    padding: 80px 0;
}

.detail-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.detail-grid .service-card {
    padding: 30px 20px;
}

.general-grid {
    grid-template-columns: repeat(3, 1fr) !important;
}

.detail-grid .service-icon {
    width: 56px;
    height: 56px;
    font-size: 1.4rem;
}

/* ===== CTA ===== */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: var(--white);
    text-align: center;
}

.cta h2 {
    font-size: 2rem;
    margin-bottom: 15px;
}

.cta p {
    margin-bottom: 30px;
    opacity: 0.8;
}

.cta .btn {
    background: var(--accent);
}

.cta .btn:hover {
    background: #d35400;
}

/* ===== Contact Detail ===== */
.contact-detail {
    padding: 80px 0;
}

.contact-layout-full {
    max-width: 800px;
    margin: 0 auto;
}

.contact-layout {
    display: flex;
    gap: 60px;
}

.contact-info-list {
    flex: 0 0 420px;
}

.contact-block {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-text h3 {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 4px;
}

.contact-text p {
    font-weight: 600;
    color: var(--text);
}

.contact-form-wrapper {
    flex: 1;
}

.contact-form-wrapper h2 {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.contact-form-wrapper > p {
    color: var(--text-light);
    margin-bottom: 30px;
}

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

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
    background: var(--white);
}

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

.btn-submit {
    width: 100%;
    padding: 14px;
    font-size: 1.1rem;
}

/* ===== Map ===== */
.map-section {
    padding: 80px 0;
    background: var(--bg);
}

.map-placeholder {
    width: 100%;
    height: 400px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.map-inner {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #ecf0f1, #bdc3c7);
    color: var(--text);
}

.map-inner i {
    font-size: 4rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.map-inner p {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text);
}

/* ===== Footer ===== */
.footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: 60px 0 0;
}

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

.footer-info h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

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

.footer-links h4,
.footer-services h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.footer-links a {
    display: block;
    padding: 5px 0;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 1;
    color: var(--accent);
}

.footer-services p {
    padding: 4px 0;
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.15);
    padding: 20px 0;
    text-align: center;
    opacity: 0.6;
    font-size: 0.9rem;
}

.footer-bottom p {
    margin-bottom: 4px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .detail-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .general-grid {
        grid-template-columns: repeat(3, 1fr) !important;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        align-items: center;
        padding: 20px 0;
        gap: 0;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        display: none;
    }
    .nav-links.active {
        display: flex;
    }
    .nav-links a {
        padding: 12px 0;
        width: 100%;
        text-align: center;
    }
    .menu-toggle {
        display: block;
    }
    .lang-switcher {
        position: fixed;
        top: 180px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: row;
        justify-content: center;
        padding: 15px 0;
        gap: 10px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        display: none;
        z-index: 999;
    }
    .nav-links.active + .lang-switcher,
    .lang-switcher.active {
        display: flex;
    }
    .lang-btn {
        padding: 8px 16px;
        font-size: 1rem;
    }
    .hero h1 {
        font-size: 2rem;
    }
    .services-grid {
        grid-template-columns: 1fr;
    }
    .about-content,
    .about-intro-content {
        flex-direction: column;
    }
    .about-intro-image {
        flex: none;
        width: 100%;
    }
    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        width: 100%;
    }
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    .contact-layout {
        flex-direction: column;
    }
    .contact-info-list {
        flex: none;
    }
    .info-grid {
        grid-template-columns: 1fr;
    }
    .detail-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .general-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .culture-grid {
        grid-template-columns: 1fr;
    }
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.service-card {
    animation: fadeIn 0.6s ease-out;
}

/* ===== Additional International Styles ===== */
.section-subtitle {
    font-size: 0.9rem;
    color: var(--text-light);
    letter-spacing: 2px;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.info-card {
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.info-icon {
    transition: all 0.3s ease;
}

.info-card:hover .info-icon {
    background: var(--gradient);
    color: var(--white);
}

.culture-card {
    transition: all 0.3s ease;
}

.culture-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.culture-icon {
    transition: all 0.3s ease;
}

.culture-card:hover .culture-icon {
    transform: scale(1.1);
}