/* ===== CSS Variables ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #10b981;
    --accent: #f59e0b;
    --dark: #1e293b;
    --darker: #0f172a;
    --light: #f8fafc;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --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: 12px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--light);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--darker);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    gap: 8px;
}

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

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

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

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

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

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

/* ===== Header & Navigation ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--darker);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 800;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 10px 18px;
    border-radius: 8px;
    font-weight: 500;
    color: var(--gray);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: var(--gray-light);
    border-radius: 20px;
    font-size: 0.875rem;
    cursor: pointer;
}

.lang-switch span {
    padding: 4px 8px;
    border-radius: 16px;
    transition: var(--transition);
}

.lang-switch span.active {
    background: var(--white);
    color: var(--primary);
    font-weight: 600;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient);
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    color: var(--white);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 0.875rem;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 3.5rem;
    color: var(--white);
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero-desc {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
}

.hero-card {
    background: var(--white);
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    transform: rotate(3deg);
}

.hero-card-inner {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.stat-box {
    background: var(--light);
    padding: 20px;
    border-radius: var(--radius);
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray);
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: float 6s ease-in-out infinite;
}

.shape-1 { width: 100px; height: 100px; top: 10%; left: 5%; animation-delay: 0s; }
.shape-2 { width: 60px; height: 60px; top: 60%; left: 10%; animation-delay: 2s; }
.shape-3 { width: 80px; height: 80px; top: 20%; right: 10%; animation-delay: 4s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* ===== Section Styles ===== */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title {
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.125rem;
    color: var(--gray);
}

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

.service-card {
    background: var(--white);
    padding: 40px 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

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

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

.service-icon {
    width: 64px;
    height: 64px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 28px;
}

.service-title {
    margin-bottom: 12px;
}

.service-desc {
    color: var(--gray);
    line-height: 1.7;
}

/* ===== About Section ===== */
.about-section {
    background: var(--darker);
    color: var(--white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-content .section-tag {
    background: rgba(99, 102, 241, 0.2);
}

.about-content .section-title {
    color: var(--white);
}

.about-content p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.125rem;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 32px;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    color: rgba(255, 255, 255, 0.9);
}

.about-feature-icon {
    width: 24px;
    height: 24px;
    background: var(--secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.about-visual {
    position: relative;
}

.about-image {
    background: var(--gradient);
    border-radius: 20px;
    padding: 40px;
    position: relative;
}

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

.about-stat {
    background: rgba(255, 255, 255, 0.1);
    padding: 24px;
    border-radius: var(--radius);
    text-align: center;
}

.about-stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
}

.about-stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

/* ===== Portfolio Section ===== */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.portfolio-item {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    aspect-ratio: 4/3;
    background: var(--gradient);
}

.portfolio-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 24px;
    opacity: 0;
    transition: var(--transition);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-category {
    color: var(--secondary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.portfolio-title {
    color: var(--white);
    font-size: 1.25rem;
}

/* ===== Team Section ===== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.team-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.team-avatar {
    width: 100%;
    aspect-ratio: 1;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--white);
}

.team-info {
    padding: 24px;
    text-align: center;
}

.team-name {
    margin-bottom: 4px;
}

.team-role {
    color: var(--gray);
    font-size: 0.875rem;
}

.team-social {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
}

.team-social a {
    width: 36px;
    height: 36px;
    background: var(--light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray);
}

.team-social a:hover {
    background: var(--primary);
    color: var(--white);
}

/* ===== Testimonials Section ===== */
.testimonials-section {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

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

.testimonial-card {
    background: var(--white);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.testimonial-quote {
    font-size: 1.125rem;
    color: var(--dark);
    line-height: 1.8;
    margin-bottom: 24px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
}

.testimonial-avatar {
    width: 48px;
    height: 48px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
}

.testimonial-name {
    font-weight: 600;
    color: var(--darker);
}

.testimonial-company {
    font-size: 0.875rem;
    color: var(--gray);
}

/* ===== Contact Section ===== */
.contact-section {
    background: var(--white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    padding-right: 40px;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 32px;
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.contact-label {
    font-size: 0.875rem;
    color: var(--gray);
    margin-bottom: 4px;
}

.contact-value {
    font-weight: 600;
    color: var(--darker);
}

.contact-form {
    background: var(--light);
    padding: 40px;
    border-radius: var(--radius);
}

.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--darker);
}

.form-input, .form-textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--gray-light);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

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

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

/* ===== Map Section ===== */
.map-section {
    height: 400px;
    position: relative;
}

#map {
    width: 100%;
    height: 100%;
}

/* ===== Footer ===== */
.footer {
    background: var(--darker);
    color: var(--white);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.footer-social a:hover {
    background: var(--primary);
}

.footer-title {
    font-size: 1.125rem;
    margin-bottom: 24px;
    color: var(--white);
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom {
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

.footer-legal a:hover {
    color: var(--primary);
}

/* ===== Page Header ===== */
.page-header {
    background: var(--gradient);
    padding: 160px 0 80px;
    text-align: center;
    color: var(--white);
}

.page-title {
    color: var(--white);
    margin-bottom: 16px;
}

.page-breadcrumb {
    display: flex;
    justify-content: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.8);
}

.page-breadcrumb a:hover {
    color: var(--white);
}

/* ===== Legal Pages ===== */
.legal-content {
    padding: 80px 0;
}

.legal-container {
    max-width: 800px;
    margin: 0 auto;
}

.legal-section {
    margin-bottom: 40px;
}

.legal-section h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--darker);
}

.legal-section h3 {
    font-size: 1.25rem;
    margin: 24px 0 12px;
    color: var(--dark);
}

.legal-section p, .legal-section li {
    color: var(--gray);
    line-height: 1.8;
    margin-bottom: 12px;
}

.legal-section ul {
    padding-left: 24px;
    list-style: disc;
}

.legal-section ul li {
    margin-bottom: 8px;
}

.legal-update {
    background: var(--light);
    padding: 16px 24px;
    border-radius: var(--radius);
    margin-bottom: 40px;
    color: var(--gray);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .services-grid,
    .portfolio-grid,
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .services-grid,
    .portfolio-grid,
    .testimonials-grid,
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .contact-form {
        padding: 24px;
    }
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.hidden { display: none; }

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

[data-lang="zh"] .lang-zh,
[data-lang="en"] .lang-en {
    display: inline;
}

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== CTA Section ===== */
.cta-section {
    background: var(--gradient);
    padding: 80px 0;
    text-align: center;
    color: var(--white);
}

.cta-title {
    color: var(--white);
    margin-bottom: 16px;
}

.cta-desc {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto 32px;
}

/* ===== Features Grid ===== */
.features-section {
    background: var(--light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 32px 24px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-4px);
}

.feature-icon {
    width: 72px;
    height: 72px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
}

.feature-title {
    margin-bottom: 8px;
}

.feature-desc {
    font-size: 0.875rem;
    color: var(--gray);
}

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Process Section ===== */
.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    position: relative;
}

.process-grid::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: var(--gray-light);
    z-index: 0;
}

.process-item {
    text-align: center;
    position: relative;
    z-index: 1;
}

.process-number {
    width: 80px;
    height: 80px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
}

.process-title {
    margin-bottom: 8px;
}

.process-desc {
    font-size: 0.875rem;
    color: var(--gray);
}

@media (max-width: 1024px) {
    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .process-grid::before {
        display: none;
    }
}

@media (max-width: 768px) {
    .process-grid {
        grid-template-columns: 1fr;
    }
}