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

:root {
    --bg: #ffffff;
    --text-primary: #222222;
    --text-secondary: #888888;
    --border: #e5e5e5;
    --tiffany: #81d8d0;
    --tiffany-dark: #6bc7be;
    --glass-bg: rgba(255, 255, 255, 0.85);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    background-color: var(--bg);
    color: var(--text-primary);
    line-height: 1.8;
    font-size: 16px;
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--glass-bg);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.neo-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

.cta-button {
    padding: 12px 28px;
    background: var(--tiffany);
    border: none;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.cta-button:hover {
    background: var(--tiffany-dark);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 160px 24px 100px;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
}

.title-line {
    display: block;
}

.title-gradient {
    display: block;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

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

.btn-primary, .btn-secondary {
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-block;
    text-align: center;
    text-decoration: none;
    border: none;
}

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

.btn-primary:hover {
    background: var(--tiffany-dark);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    color: var(--text-secondary);
}

.hero-visual {
    flex: 1;
    position: relative;
    height: 400px;
}

.floating-card {
    position: absolute;
    width: 180px;
    height: 120px;
    background: var(--glass-bg);
    border: 1px solid var(--border);
    animation: float 6s ease-in-out infinite;
}

.card-1 {
    top: 40px;
    left: 60px;
    animation-delay: 0s;
}

.card-2 {
    top: 160px;
    left: 180px;
    animation-delay: 2s;
}

.card-3 {
    top: 280px;
    left: 80px;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-16px); }
}

.section {
    padding: 100px 0;
    border-bottom: 1px solid var(--border);
}

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

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 32px;
    border: 1px solid var(--border);
    background: var(--glass-bg);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.feature-icon i {
    font-size: 40px;
}

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

.feature-card p {
    color: var(--text-secondary);
    font-size: 15px;
}

.os-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.os-window {
    border: 1px solid var(--border);
    background: var(--glass-bg);
}

.os-header {
    padding: 16px;
    border-bottom: 1px solid var(--border);
}

.os-dots {
    display: flex;
    gap: 8px;
}

.os-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border);
}

.os-content {
    padding: 24px;
}

.os-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.os-app {
    aspect-ratio: 1;
    border: 1px solid var(--border);
}

.os-features {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.os-feature {
    padding: 24px;
    border: 1px solid var(--border);
    background: var(--glass-bg);
}

.os-feature h4 {
    font-size: 18px;
    margin-bottom: 8px;
}

.os-feature h4 i {
    margin-right: 8px;
    font-size: 20px;
}

.os-feature p {
    color: var(--text-secondary);
}

.download-section {
    border-bottom: none;
}

.download-box {
    text-align: center;
    padding: 60px;
    border: 1px solid var(--border);
    background: var(--glass-bg);
}

.download-box h2 {
    font-size: 36px;
    margin-bottom: 12px;
}

.download-box p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.download-buttons {
    display: flex;
    gap: 24px;
    justify-content: center;
}

.download-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 28px 48px;
    border: 1px solid var(--border);
    background: var(--glass-bg);
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-primary);
    text-decoration: none;
}

.download-btn:hover {
    border-color: var(--text-secondary);
}

.download-icon {
    font-size: 32px;
}

.download-icon i {
    font-size: 32px;
}

.download-btn span:nth-child(2) {
    font-weight: 600;
    font-size: 16px;
}

.download-version {
    font-size: 13px;
    color: var(--text-secondary);
}

.footer {
    padding: 60px 0 30px;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 12px;
}

.footer-links {
    display: flex;
    gap: 60px;
}

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

.footer-column ul {
    list-style: none;
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    line-height: 2.2;
    transition: color 0.2s;
}

.footer-column a i {
    margin-right: 6px;
    font-size: 16px;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
}

@media (max-width: 968px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 180px;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .os-showcase {
        grid-template-columns: 1fr;
    }
    
    .download-buttons {
        flex-direction: column;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 40px;
    }
    
    .nav-menu {
        display: none;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 32px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 30px;
    }
}