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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

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

/* Header */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #667eea;
}

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

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #667eea;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    text-align: center;
    color: white;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Home Scenarios */
.home-scenarios {
    margin: 1.5rem 0;
}

.home-scenarios p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 500;
    text-align: center;
    padding: 0.8rem 1.5rem;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    backdrop-filter: blur(5px);
    max-width: 800px;
    margin: 0 auto;
}

/* Home Features */
.home-features {
    margin: 2rem auto;
    max-width: 800px;
}

.feature-highlights {
    list-style: none;
    text-align: left;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.feature-highlights li {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    backdrop-filter: blur(5px);
    transition: transform 0.3s, background 0.3s;
}

.feature-highlights li:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(5px);
}

.feature-highlights li i {
    color: #4cd964;
    font-size: 1.2rem;
}

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

.cta-button {
    display: inline-block;
    padding: 15px 30px;
    background: linear-gradient(45deg, #ff6b6b, #ee5a24);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 8px 30px rgba(238, 90, 36, 0.3);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(238, 90, 36, 0.4);
}

/* Features Section */
.features {
    padding: 80px 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
}

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

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #f0f0f0;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* Technology Section */
.technology {
    padding: 80px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

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

.tech-item {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.tech-item:hover {
    transform: translateY(-5px);
}

.tech-item i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #667eea;
}

/* Demo Section */
.demo {
    padding: 80px 0;
    background: white;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    background: #000;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.demo-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.demo-text h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: #333;
}

.demo-text p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 1rem;
}

.demo-features {
    list-style: none;
    margin-top: 1.5rem;
}

.demo-features li {
    padding: 0.5rem 0;
    color: #666;
}

.demo-features li i {
    color: #28a745;
    margin-right: 0.5rem;
}

/* Footer */
footer {
    background: #2c3e50;
    color: 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 {
    margin-bottom: 1rem;
    color: #ecf0f1;
}

.footer-section p,
.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    line-height: 1.8;
}

.footer-section a:hover {
    color: #667eea;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #34495e;
    color: #95a5a6;
}

.friend-links {
    background: #34495e;
    padding: 1.5rem 0;
    text-align: center;
    border-top: 1px solid #2c3e50;
}

.friend-links h3 {
    color: #ecf0f1;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.friend-links-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.friend-links a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.9rem;
}

.friend-links a:hover {
    color: #667eea;
}

/* QR Code Section */
.qrcode-section {
    margin-top: 1rem;
    text-align: center;
}

.qrcode-image {
    width: 120px;
    height: 120px;
    object-fit: contain;
    border: 2px solid #ddd;
    border-radius: 8px;
    padding: 5px;
    background: white;
}

.qrcode-description {
    margin-top: 0.5rem;
    color: #ecf0f1;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

    .demo-content {
        grid-template-columns: 1fr;
    }

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

/* Scroll animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s, transform 0.6s;
}

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