:root {
    --bg-light: #ffffff;
    --text-light: #1d1d1f;
    --bg-dark: #000000;
    --text-dark: #f5f5f7;
    --accent: #2997ff;
    --nav-bg: rgba(255, 255, 255, 0.8);
    --nav-border: rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-light);
    color: var(--text-light);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: 52px;
    background-color: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    z-index: 1000;
    border-bottom: 1px solid var(--nav-border);
}

.logo {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-light);
    font-size: 0.85rem;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.nav-links a:hover {
    opacity: 1;
}

.buy-btn {
    background-color: var(--text-light);
    color: var(--bg-light) !important;
    padding: 5px 12px;
    border-radius: 20px;
    font-weight: 400;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.buy-btn:hover {
    transform: scale(1.05);
    background-color: #000;
}

/* Common Section */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
}

.text-center {
    text-align: center;
}

.section-dark {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

.section-light {
    background-color: var(--bg-light);
    color: var(--text-light);
}

.section-title {
    font-size: 3.5rem;
    font-weight: 600;
    letter-spacing: -1.5px;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.section-text {
    font-size: 1.5rem;
    font-weight: 300;
    line-height: 1.5;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.8;
}

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

.hero-content {
    text-align: center;
    z-index: 2;
    margin-bottom: 50px;
}

.hero-title {
    font-size: 5rem;
    font-weight: 600;
    letter-spacing: -2px;
    margin-bottom: 10px;
}

.hero-subtitle {
    font-size: 2rem;
    font-weight: 300;
    opacity: 0.8;
    margin-bottom: 20px;
}

.hero-price {
    font-size: 1.2rem;
    opacity: 0.6;
}

.hero-btn {
    display: inline-block;
    background-color: var(--accent);
    color: var(--bg-light);
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 10px 20px rgba(41, 151, 255, 0.3);
}

.hero-btn:hover {
    transform: translateY(-3px) scale(1.05);
    background-color: #1a7fe0;
    box-shadow: 0 15px 25px rgba(41, 151, 255, 0.4);
}

.hero-image-container {
    width: 100%;
    max-width: 1000px;
    display: flex;
    justify-content: center;
    transform: scale(0.9);
}

.hero-img {
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.1);
}

/* Overview Section */
.overview {
    padding: 150px 0;
}

/* Features Grid */
.features {
    padding: 120px 0;
}

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

.feature-grid.reverse {
    direction: rtl;
}

.feature-grid.reverse > * {
    direction: ltr;
}

.feature-text {
    padding-right: 40px;
}

.feature-grid.reverse .feature-text {
    padding-right: 0;
    padding-left: 40px;
}

.feature-image img {
    width: 100%;
    border-radius: 30px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.1);
}

/* Specs */
.specs {
    padding: 120px 0;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-top: 80px;
}

.spec-item {
    padding: 40px;
    background: rgba(0, 0, 0, 0.03);
    border-radius: 20px;
    transition: transform 0.3s ease;
}

.spec-item:hover {
    transform: translateY(-10px);
}

.spec-item h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    opacity: 0.6;
    font-weight: 600;
}

.spec-item p {
    font-size: 1.5rem;
    font-weight: 600;
}

/* 3D Model Viewer */
.model-viewer {
    padding: 120px 0;
}

.canvas-container {
    width: 100%;
    max-width: 800px;
    height: 500px;
    margin: 40px auto 0;
    border-radius: 20px;
    overflow: hidden;
    background-color: rgba(255, 255, 255, 0.05);
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    position: relative;
    cursor: grab;
}

.canvas-container:active {
    cursor: grabbing;
}

/* Footer */
footer {
    padding: 50px 0;
    background-color: #f5f5f7;
    font-size: 0.85rem;
    color: #86868b;
}

/* Initial GSAP states */
.fade-up, .fade-left, .fade-right {
    opacity: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* simple mobile nav */
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .feature-grid.reverse {
        direction: ltr;
    }
    
    .feature-text, .feature-grid.reverse .feature-text {
        padding: 0;
        text-align: center;
    }
}