/* ========================================
   Global Styles & Variables
   ======================================== */
:root {
    --primary-color: #6366f1;
    --primary-hover: #818cf8;
    --secondary-color: #22d3ee;
    --accent-color: #f472b6;
    --bg-dark: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a25;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --border-color: #27272a;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #22d3ee 100%);
    --gradient-accent: linear-gradient(135deg, #f472b6 0%, #6366f1 100%);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* ========================================
   Header & Navigation
   ======================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 50px;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 20px;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 35px;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 15px;
    position: relative;
    padding: 5px 0;
}

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

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

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.lang-switch {
    display: flex;
    background: var(--bg-card);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.lang-switch button {
    padding: 8px 15px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 13px;
    transition: var(--transition);
}

.lang-switch button.active {
    background: var(--gradient-primary);
    color: var(--text-primary);
}

.btn-primary {
    padding: 10px 25px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

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

.mobile-menu span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

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

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(34, 211, 238, 0.1) 0%, transparent 40%),
        radial-gradient(ellipse at 60% 80%, rgba(244, 114, 182, 0.1) 0%, transparent 40%);
}

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

.hero-text h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 25px;
}

.hero-text h1 span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 35px;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

.btn-secondary {
    padding: 12px 30px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 15px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.hero-visual {
    position: relative;
    height: 500px;
}

.hero-card {
    position: absolute;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 25px;
    backdrop-filter: blur(10px);
}

.hero-card-1 {
    top: 0;
    right: 0;
    width: 280px;
    animation: float 6s ease-in-out infinite;
}

.hero-card-2 {
    bottom: 50px;
    left: 0;
    width: 260px;
    animation: float 6s ease-in-out infinite 2s;
}

.hero-card-3 {
    top: 50%;
    right: 20%;
    width: 200px;
    animation: float 6s ease-in-out infinite 4s;
}

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

.card-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    font-size: 24px;
}

.hero-card h3 {
    font-size: 16px;
    margin-bottom: 8px;
}

.hero-card p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ========================================
   Services Section
   ======================================== */
.services {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 50px;
    font-size: 13px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 15px;
}

.section-header p {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

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

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 35px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

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

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

.service-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 25px;
}

.service-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.service-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

/* ========================================
   About Section
   ======================================== */
.about {
    padding: 120px 0;
    background: linear-gradient(180deg, transparent 0%, rgba(99, 102, 241, 0.03) 50%, transparent 100%);
}

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

.about-visual {
    position: relative;
}

.about-image {
    width: 100%;
    height: 450px;
    background: var(--gradient-primary);
    border-radius: 20px;
    position: relative;
    overflow: hidden;
}

.about-image::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150px;
    height: 150px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.about-stats {
    position: absolute;
    bottom: -30px;
    right: -30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 25px 35px;
    display: flex;
    gap: 40px;
}

.stat-item h4 {
    font-size: 32px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-item p {
    font-size: 13px;
    color: var(--text-secondary);
}

.about-text h2 {
    font-size: 38px;
    margin-bottom: 25px;
}

.about-text > p {
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 16px;
}

.about-features {
    display: grid;
    gap: 20px;
}

.feature-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
}

.feature-item h4 {
    font-size: 16px;
    margin-bottom: 5px;
}

.feature-item p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ========================================
   Team Section
   ======================================== */
.team {
    padding: 120px 0;
}

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

.team-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    transition: var(--transition);
}

.team-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
}

.team-avatar {
    width: 100px;
    height: 100px;
    background: var(--gradient-primary);
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
}

.team-card h3 {
    font-size: 18px;
    margin-bottom: 5px;
}

.team-card .role {
    color: var(--primary-color);
    font-size: 13px;
    margin-bottom: 15px;
}

.team-card p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    padding: 120px 0;
    background: linear-gradient(180deg, transparent 0%, rgba(99, 102, 241, 0.05) 100%);
}

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

.contact-info h2 {
    font-size: 38px;
    margin-bottom: 20px;
}

.contact-info > p {
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.contact-details {
    display: grid;
    gap: 25px;
}

.contact-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 20px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 15px;
    margin-bottom: 5px;
}

.contact-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
}

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

.form-group label {
    display: block;
    font-size: 14px;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
}

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

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.contact-form .btn-primary {
    width: 100%;
    padding: 15px;
    font-size: 16px;
}

/* ========================================
   Footer
   ======================================== */
footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 50px;
}

.footer-brand .logo {
    margin-bottom: 20px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
    max-width: 300px;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 20px;
}

.footer-links ul {
    display: grid;
    gap: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 14px;
}

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

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 13px;
}

.footer-legal {
    display: flex;
    gap: 25px;
}

.footer-legal a {
    color: var(--text-muted);
    font-size: 13px;
}

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

/* ========================================
   Legal Pages (Privacy & Terms)
   ======================================== */
.legal-page {
    padding-top: 120px;
    padding-bottom: 80px;
    min-height: 100vh;
}

.legal-header {
    text-align: center;
    margin-bottom: 60px;
}

.legal-header h1 {
    font-size: 42px;
    margin-bottom: 15px;
}

.legal-header p {
    color: var(--text-secondary);
}

.legal-content {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 50px;
}

.legal-content h2 {
    font-size: 24px;
    margin: 40px 0 20px;
    color: var(--primary-color);
}

.legal-content h2:first-child {
    margin-top: 0;
}

.legal-content h3 {
    font-size: 18px;
    margin: 25px 0 15px;
}

.legal-content p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    line-height: 1.8;
}

.legal-content ul {
    margin: 15px 0;
    padding-left: 25px;
}

.legal-content li {
    color: var(--text-secondary);
    margin-bottom: 10px;
    list-style: disc;
    line-height: 1.7;
}

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

.legal-content a:hover {
    text-decoration: underline;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text p {
        margin: 0 auto 35px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    nav {
        padding: 15px 20px;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu {
        display: flex;
    }
    
    .hero-text h1 {
        font-size: 36px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .legal-content {
        padding: 30px 20px;
    }
    
    .about-stats {
        position: relative;
        bottom: 0;
        right: 0;
        margin-top: 20px;
        justify-content: center;
    }
}