/* Variables */
:root {
    --primary-color: #333;
    --secondary-color: #4a6fa5;
    --background-color: #fefefe;
    --background-off-white: #f8f8f8;
    --text-color: #333;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --border-radius: 4px;
    --box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #2c4268;
}

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

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-xl) var(--spacing-lg);
    scroll-margin-top: 80px; /* For smooth scrolling with fixed header */
}

.section:nth-child(even) {
    background-color: var(--background-off-white);
}

/* Header & Navigation */
header {
    background-color: var(--background-color);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: var(--spacing-md) 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 0;
}

nav ul {
    display: flex;
    list-style: none;
}

nav li {
    margin-left: var(--spacing-lg);
}

nav a {
    font-weight: 500;
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: 100%;
}

/* Mobile Navigation */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--primary-color);
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about-image {
    display: flex;
    justify-content: center;
}

.about-image img {
    border-radius: 50%;
    box-shadow: var(--box-shadow);
    max-width: 250px;
    width: 100%;
    height: auto;
    object-fit: cover;
    aspect-ratio: 1/1;
}

/* Social Links */
.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.social-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background-color: white;
    box-shadow: var(--box-shadow);
    min-width: 120px;
}

.social-link i {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.social-link:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

/* Button styles (keeping these as they might be used elsewhere) */
.button {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--secondary-color);
    color: white;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.button i {
    margin-right: var(--spacing-sm);
}

.button:hover {
    background-color: #2c4268;
    color: white;
}

/* 3D Model Viewer */
.model-viewer {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#gaussian-splat-container {
    width: 100%;
    max-width: 800px;
    height: 500px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    position: relative;
}

#gaussian-splat-container canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.model-controls {
    margin-top: var(--spacing-md);
    text-align: center;
    font-size: 0.9rem;
    color: #666;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-lg) 0;
    text-align: center;
    flex-shrink: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    header .container {
        position: relative;
    }
    
    .mobile-nav-toggle {
        display: block;
    }
    
    nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--background-color);
        box-shadow: var(--box-shadow);
        padding: var(--spacing-md);
        border-radius: 0 0 var(--border-radius) var(--border-radius);
        transform: translateY(-150%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    nav ul {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    nav li {
        margin: 0;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        margin: 0 auto;
        max-width: 300px;
    }
    
    .social-link {
        min-width: 100px;
    }
    
    #gaussian-splat-container {
        height: 400px;
    }
}