:root {
    --primary-color: #2c5282;
    --primary-dark: #1a365d;
    --primary-light: #4299e1;
    --accent-color: #ed8936;
    --text-dark: #2d3748;
    --text-light: #ffffff;
    --background-light: #f7fafc;
    --background-gray: #edf2f7;
    --spacing-unit: 1rem;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Noto Sans SC', 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
}

/* Language Toggle Styles */
body.zh .lang-en {
    display: none;
}

body.en .lang-zh {
    display: none;
}

.lang-toggle {
    background: transparent;
    border: 2px solid var(--text-light);
    color: var(--text-light);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    margin-left: 2rem;
}

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

/* Header Styles */
header {
    background-color: var(--primary-color);
    padding: 1rem 2rem;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

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

.logo h1 {
    color: var(--text-light);
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-links {
    display: flex;
    align-items: center;
}

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    margin-left: 2rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    position: relative;
    background-color: #ffffff;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 0 2rem;
    color: var(--text-dark);
    overflow: hidden;
}

.hero-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
    padding: 2rem 0;
}

.hero-text {
    flex: 1;
    text-align: left;
    max-width: 600px;
}

.hero-image {
    flex: 1;
    max-width: 600px;
    position: relative;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.5s ease;
}

.hero-image:hover img {
    transform: perspective(1000px) rotateY(0deg);
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    line-height: 1.2;
    font-weight: 700;
}

.hero-content h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    font-weight: 500;
}

.hero-content p {
    font-size: 1.5rem;
    margin-bottom: 2.5rem;
    color: var(--text-dark);
    opacity: 0.85;
    line-height: 1.6;
}

.cta-buttons {
    margin-top: 2.5rem;
    display: flex;
    gap: 1rem;
}

.cta-primary, .cta-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    min-width: 160px;
}

.cta-primary {
    background-color: var(--accent-color);
    color: var(--text-light);
}

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

.cta-primary:hover {
    background-color: #dd6b20;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(237, 137, 54, 0.2);
}

.cta-secondary:hover {
    background-color: var(--primary-color);
    color: var(--text-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 82, 130, 0.2);
}

/* Features Section */
.features {
    padding: 4rem 2rem;
    background-color: var(--background-light);
}

.features h2, .benefits h2, .contact h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
    font-size: 2.5rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: white;
    padding: 2.5rem 2rem;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    text-align: center;
    border: 1px solid var(--background-gray);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

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

/* Benefits Section */
.benefits {
    padding: 4rem 2rem;
    background-color: white;
}

.benefits-container {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
}

.benefit-item {
    padding: 2rem;
    text-align: center;
}

.benefit-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.benefit-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Contact Section */
.contact {
    padding: 4rem 2rem;
    background-color: var(--background-light);
}

.contact-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-info {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.contact-methods {
    margin-top: 2rem;
}

.contact-methods p {
    margin: 1rem 0;
    font-size: 1.1rem;
}

.contact-methods i {
    color: var(--primary-color);
    margin-right: 0.5rem;
}

/* Footer */
footer {
    background-color: var(--primary-dark);
    color: var(--text-light);
    padding: 2rem;
    text-align: center;
}

/* Language Specific Styles */
.cn {
    font-family: 'Noto Sans SC', sans-serif;
}

.en {
    font-family: 'Roboto', sans-serif;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero {
        padding: 6rem 2rem 4rem;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 3rem;
    }

    .hero-text {
        max-width: 100%;
    }

    .hero-image {
        max-width: 70%;
    }

    .cta-buttons {
        justify-content: center;
    }

    .hero-content h1 {
        font-size: 3.5rem;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 5rem 1.5rem 3rem;
    }

    .hero-content {
        gap: 2rem;
    }

    .hero-content h1 {
        font-size: 2.75rem;
    }
    
    .hero-content p {
        font-size: 1.25rem;
    }
    
    .hero-image {
        max-width: 90%;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .cta-primary, .cta-secondary {
        width: 100%;
        padding: 1rem;
    }

    .nav-links a:not(.lang-toggle) {
        display: none;
    }
    
    .nav-links {
        justify-content: flex-end;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-container {
        grid-template-columns: 1fr;
    }
    
    .lang-toggle {
        margin-left: 0;
    }

    .faq-question {
        padding: 1.25rem 1.5rem;
    }

    .faq-answer-content {
        padding: 0 1.5rem 1.5rem;
    }
}

/* FAQ Section */
.faq {
    padding: 6rem 2rem;
    background-color: var(--background-light);
}

.faq h2 {
    text-align: center;
    margin-bottom: 4rem;
    color: var(--primary-color);
    font-size: 2.5rem;
}

.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    box-shadow: var(--card-shadow);
    overflow: hidden;
    border: 1px solid var(--background-gray);
}

.faq-question {
    padding: 1.5rem 2rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-dark);
    font-weight: 500;
    transition: all 0.3s ease;
}

.question-text {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.question-text i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.faq-question:hover {
    background-color: var(--background-gray);
}

.faq-question i.fa-chevron-down {
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-answer {
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    background-color: var(--background-light);
}

.faq-answer-content {
    padding: 0 2rem 2rem;
    color: var(--text-dark);
    line-height: 1.8;
}

.faq-item.active .faq-question {
    background-color: var(--background-gray);
    border-bottom: 1px solid var(--background-gray);
}

.faq-item.active .faq-question i.fa-chevron-down {
    transform: rotate(180deg);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}