/* ===================================
   Global Styles & Reset
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1e40af;
    --secondary-color: #3b82f6;
    --accent-color: #60a5fa;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --text-color: #334155;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', 
                 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

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

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

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.logo-chinese,
.footer-chinese {
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

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

.nav-menu a {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

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

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.lang-toggle {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

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

/* ===================================
   Hero Section
   =================================== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 6rem 0;
    text-align: center;
}

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

.hero-title {
    font-size: 2.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    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;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 5px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

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

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

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

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

/* ===================================
   Features Section
   =================================== */
.features {
    padding: 5rem 0;
    background-color: var(--light-color);
}

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

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

.feature-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

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

.feature-card h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-color);
    line-height: 1.6;
}

/* ===================================
   CTA Section
   =================================== */
.cta {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

/* ===================================
   Page Header
   =================================== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    font-size: 1.25rem;
    opacity: 0.95;
}

/* ===================================
   About Page
   =================================== */
.about-content {
    padding: 5rem 0;
}

.about-section {
    margin-bottom: 4rem;
}

.about-section h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.about-section p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

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

.expertise-item {
    background-color: var(--light-color);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.expertise-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.about-cta {
    text-align: center;
    background-color: var(--light-color);
    padding: 3rem;
    border-radius: 10px;
    margin-top: 3rem;
}

.about-cta h2 {
    color: var(--dark-color);
    margin-bottom: 1rem;
}

/* ===================================
   Services Page
   =================================== */
.services-content {
    padding: 5rem 0;
}

.service-detail {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    box-shadow: var(--shadow);
}

.service-header {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.service-icon {
    font-size: 3rem;
    flex-shrink: 0;
}

.service-header h2 {
    color: var(--primary-color);
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.service-tagline {
    color: var(--text-color);
    font-size: 1rem;
    opacity: 0.8;
}

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

.service-body ul {
    list-style-position: inside;
    margin-left: 1rem;
}

.service-body li {
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.service-note {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: var(--light-color);
    border-left: 4px solid var(--warning-color);
    border-radius: 5px;
}

.services-cta {
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 3rem;
    border-radius: 10px;
    margin-top: 3rem;
}

.services-cta h2 {
    margin-bottom: 1rem;
}

/* ===================================
   Contact Page
   =================================== */
.contact-content {
    padding: 5rem 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

.contact-info h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.contact-info > p {
    margin-bottom: 2rem;
    line-height: 1.7;
}

.contact-details {
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

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

.contact-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
}

.contact-item a {
    color: var(--secondary-color);
}

.contact-item a:hover {
    text-decoration: underline;
}

.contact-hours {
    background-color: var(--light-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.contact-hours h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Contact Form */
.contact-form-wrapper {
    background-color: var(--light-color);
    padding: 2.5rem;
    border-radius: 10px;
}

.contact-form-wrapper h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

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

.form-group textarea {
    resize: vertical;
}

.contact-form button {
    width: 100%;
    margin-top: 0.5rem;
}

.form-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 5px;
    display: none;
}

.form-message.success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #10b981;
    display: block;
}

.form-message.error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #ef4444;
    display: block;
}

/* FAQ Section */
.contact-faq {
    background-color: var(--light-color);
    padding: 3rem;
    border-radius: 10px;
}

.contact-faq h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2.5rem;
}

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

.faq-item {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.faq-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.faq-item p {
    line-height: 1.6;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.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;
}

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

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

.footer-section a {
    color: var(--white);
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-section a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .nav-wrapper {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .nav-right {
        flex-direction: column;
        gap: 1rem;
    }

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

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

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

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

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

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

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

@media (max-width: 480px) {
    .hero {
        padding: 4rem 0;
    }

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

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .service-header {
        flex-direction: column;
        text-align: center;
    }

    .contact-form-wrapper {
        padding: 1.5rem;
    }
}