/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #0ea5e9;
    --light-color: #f8fafc;
    --dark-color: #1e293b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --shadow: 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);
    --radius: 8px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    color: var(--dark-color);
    line-height: 1.6;
    background-color: #ffffff;
    overflow-x: hidden;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--gray-600);
}

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

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    gap: 8px;
}

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

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

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Language Switcher */
.language-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    background: white;
    border-radius: 50px;
    padding: 4px;
    box-shadow: var(--shadow);
}

.lang-btn {
    padding: 6px 16px;
    border: none;
    background: transparent;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 999;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

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

.nav-link {
    font-weight: 500;
    color: var(--gray-600);
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

/* Bilingual Navigation Text */
.nav-text-en,
.nav-text-zh {
    display: block;
    line-height: 1.2;
}

/* Default: Show English, hide Chinese */
html[lang="en"] .nav-text-en,
html[lang="zh"] .nav-text-zh {
    display: block;
}

html[lang="en"] .nav-text-zh,
html[lang="zh"] .nav-text-en {
    display: none;
}

/* Language Switcher in Navigation */
.nav-language-switcher {
    display: flex;
    background: white;
    border-radius: 50px;
    padding: 4px;
    box-shadow: var(--shadow);
    margin: 0 1rem;
}

.nav-language-switcher .lang-btn {
    padding: 6px 16px;
    border: none;
    background: transparent;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
}

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

.cta-nav {
    padding: 10px 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cta-nav:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

/* Bilingual CTA Text */
.cta-nav .nav-text-en,
.cta-nav .nav-text-zh {
    display: block;
    line-height: 1.2;
}

html[lang="en"] .cta-nav .nav-text-en,
html[lang="zh"] .cta-nav .nav-text-zh {
    display: block;
}

html[lang="en"] .cta-nav .nav-text-zh,
html[lang="zh"] .cta-nav .nav-text-en {
    display: none;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding: 180px 0 100px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--gray-900);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: var(--gray-600);
}

.hero-highlights {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.highlight {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
}

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

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-image {
    flex: 1;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
}

.hero-image:hover img {
    transform: scale(1.05);
}

/* Positioning Section */
.positioning {
    padding: 80px 0;
    text-align: center;
    background-color: var(--light-color);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.section-text {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto;
    color: var(--gray-600);
}

/* Products Section */
.products {
    padding: 100px 0;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.product-card {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-200);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.product-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.product-icon i {
    font-size: 1.75rem;
    color: white;
}

.product-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.product-desc {
    margin-bottom: 1.5rem;
    color: var(--gray-600);
}

.product-features {
    list-style: none;
}

.product-features li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray-700);
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* Use Cases */
.usecases {
    padding: 100px 0;
    background-color: var(--light-color);
}

.usecases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.usecase-card {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.usecase-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--warning-color), #f97316);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.usecase-icon i {
    font-size: 1.75rem;
    color: white;
}

/* Why Choose Us */
.why-us {
    padding: 100px 0;
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.why-card {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.why-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Trust & Stats */
.trust {
    padding: 80px 0;
    background-color: var(--light-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.stat {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.stat h3 {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Pricing */
.pricing {
    padding: 100px 0;
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 3rem;
}

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

.pricing-card {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 2px solid var(--gray-200);
    transition: var(--transition);
    text-align: center;
}

.pricing-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.pricing-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

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

.price span {
    font-size: 2.5rem;
}

.pricing-card ul {
    list-style: none;
    text-align: left;
    margin-bottom: 2rem;
}

.pricing-card ul li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray-700);
}

.pricing-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.pricing-note {
    text-align: center;
    font-style: italic;
    color: var(--gray-500);
}

/* About */
.about {
    padding: 80px 0;
    background-color: var(--light-color);
}

.about-text {
    max-width: 800px;
    margin: 0 auto 1.5rem;
    text-align: center;
    font-size: 1.25rem;
}

/* Contact */
.contact {
    padding: 100px 0;
}

.contact-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 3rem;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.contact-item i {
    font-size: 2rem;
    color: var(--primary-color);
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group:nth-child(3),
.form-group:nth-child(4) {
    grid-column: span 2;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.contact-form .btn-primary {
    grid-column: span 2;
    justify-self: center;
    margin-top: 1rem;
}

/* Legal Sections */
.legal-section {
    padding: 80px 0;
    background-color: var(--gray-50);
}

.legal-section:nth-of-type(even) {
    background-color: white;
}

.legal-content {
    background: white;
    border-radius: var(--radius);
    padding: 3rem;
    box-shadow: var(--shadow);
    line-height: 1.8;
    color: var(--gray-700);
}

.legal-content h3 {
    color: var(--gray-900);
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.legal-content p {
    margin-bottom: 1rem;
    color: var(--gray-700);
}

.legal-text-en,
.legal-text-zh {
    display: block;
}

html[lang="en"] .legal-text-en,
html[lang="zh"] .legal-text-zh {
    display: block;
}

html[lang="en"] .legal-text-zh,
html[lang="zh"] .legal-text-en {
    display: none;
}

/* Footer */
.footer {
    padding: 3rem 0;
    background-color: var(--gray-900);
    color: white;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-logo i {
    font-size: 2rem;
}

.footer-text {
    color: var(--gray-400);
    max-width: 500px;
}

/* Footer Links */
.footer-links {
    display: flex;
    gap: 2rem;
    margin: 1rem 0;
}

.footer-link {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.footer-link:hover {
    color: white;
    text-decoration: underline;
}

/* Bilingual Footer Text */
.footer-text-en,
.footer-text-zh {
    display: block;
    line-height: 1.2;
}

html[lang="en"] .footer-text-en,
html[lang="zh"] .footer-text-zh {
    display: block;
}

html[lang="en"] .footer-text-zh,
html[lang="zh"] .footer-text-en {
    display: none;
}

.copyright {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-top: 1rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    h1 {
        font-size: 2.75rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-highlights {
        grid-template-columns: 1fr;
    }
    
    .legal-content {
        padding: 2rem;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        z-index: 1000;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-language-switcher {
        margin: 1rem 0;
        order: 3;
        width: 100%;
        justify-content: center;
    }
    
    .cta-nav {
        display: none;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .contact-form {
        grid-template-columns: 1fr;
    }
    
    .form-group:nth-child(3),
    .form-group:nth-child(4) {
        grid-column: span 1;
    }
    
    .contact-form .btn-primary {
        grid-column: span 1;
    }
    
    .legal-content {
        padding: 1.5rem;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .legal-section {
        padding: 60px 0;
    }
}