:root {
    /* --- COLOR PALETTE --- */
    /* Change these HEX codes to update your site's color theme */
    --bg-color: #0d1117;       /* Main page background (Dark Mode) */
    --card-bg: #161b22;        /* Background for project cards/panels */
    --text-primary: #f0f6fc;   /* Main heading and body text color */
    --text-secondary: #8b949e; /* Muted text color for descriptions */

    /* --- ACCENT COLOR --- */
    /* This sets the "Highlight" color (currently blue) */
    --accent: #58a6ff;
    --accent-glow: rgba(88, 166, 255, 0.15); /* Glow effect color (matches accent) */

    --border: #30363d;         /* Border colors */
    --transition-speed: 0.3s;
}

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

body {
    /* --- TYPOGRAPHY --- */
    /* Change 'Inter' to any other font you import in index.html */
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- NEW FANCY ANIMATIONS --- */
.reveal {
    opacity: 0;
    transition: all 1.5s cubic-bezier(0.2, 0.8, 0.2, 1);
    will-change: transform, opacity;
}

.reveal.visible {
    opacity: 1;
    transform: none;
}

/* Animation Variants */
.reveal.fade-up {
    transform: translateY(60px);
}

.reveal.fade-in {
    transform: translateY(0) scale(0.98);
}

.reveal.zoom-in {
    transform: scale(0.85);
}

.reveal.slide-left {
    transform: translateX(50px);
}

.reveal.slide-right {
    transform: translateX(-50px);
}

/* Stagger delays manually if needed */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }

/* Large Visual Elements */
.giant-hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 20px 80px;
    background: var(--bg-color);
}

.giant-title {
    font-size: clamp(3rem, 6vw, 6rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 30%, #58a6ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -2px;
}

.large-subtitle {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    color: var(--text-secondary);
    margin-bottom: 50px;
    font-weight: 300;
}

.cinema-container {
    width: 90vw;
    max-width: 1400px;
    margin: 40px auto;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 30px 60px -15px rgba(0,0,0,0.6);
    border: 1px solid #30363d;
}

.cinema-video {
    width: 100%;
    display: block;
    aspect-ratio: 16/9;
}

.feature-section {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 100px 0;
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 60px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    align-items: center;
}

.stat-box {
    background: rgba(22, 27, 34, 0.6);
    border: 1px solid var(--border);
    padding: 40px;
    border-radius: 16px;
    backdrop-filter: blur(10px);
}


/* Navigation */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-speed);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
}

.site-header.scrolled {
    background: rgba(13, 17, 23, 0.85);
    padding: 15px 50px;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    font-family: 'Fira Code', monospace;
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-speed);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}

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

/* Hero Section override */
.hero {
    /* Reset section defaults to allow full screen background */
    max-width: 100vw;
    padding: 0;
    margin: 0;
    
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: #000; /* Fallback */
}

.hero::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 200px; /* Adjust height until the colorbar is covered */
    background: linear-gradient(to top, var(--bg-color) 20%, transparent 100%);
    z-index: 2; /* Make sure it sits above the video but below the text */
    pointer-events: none;
}

.hero-video {
    width: 100%;
    height: 100%;
    opacity: 0.4;
    object-fit: contain;
}

/* Simulated particles/grid for visual flair */
.hero::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: 
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.05;
    z-index: -1;
}

.hero-content {
    text-align: center;
    max-width: 1400px;
    z-index: 1;
    width: 100%;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 0%, #aaa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero .intro {
    font-size: 3.0rem;
    color: var(--accent);
    font-family: 'Fira Code', monospace;
    margin-bottom: 10px;
}

.hero p {
    font-size: 2.0rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-block;
    padding: 12px 30px;
    border: 1px solid var(--accent);
    color: var(--accent);
    text-decoration: none;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    transition: var(--transition-speed);
}

.cta-button:hover {
    background: var(--accent-glow);
    transform: translateY(-2px);
}

/* Content Sections */
section {
    padding: 100px 50px;
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 50px;
    display: flex;
    align-items: center;
    justify-content: center; /* Center the title content */
    gap: 20px;
    text-align: center;
}

.section-title::after {
    content: '';
    flex-grow: 1;
    height: 1px;
    background: var(--border);
    max-width: 200px; /* Limit line width */
}

.section-title::before {
    content: '';
    flex-grow: 1;
    height: 1px;
    background: var(--border);
    max-width: 200px; /* Limit line width */
}

.section-title span {
    color: var(--accent);
    font-family: 'Fira Code', monospace;
    font-size: 1.5rem;
    margin-right: 0;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 80px; /* Increased gap */
    align-items: center; /* Center verify alignment */
    max-width: 1200px; /* constrain internal content */
    margin: 0 auto; /* center the grid itself */
}

.about-text {
    color: var(--text-secondary);
}

.about-image {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
}

.about-img-wrapper {
    display: block;
    position: relative;
    width: 100%;
    border-radius: 4px;
    /* background-color: var(--accent); removed tint background */
    z-index: 1;
}

.about-img-wrapper::after {
    content: '';
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    border: 2px solid var(--accent);
    top: 20px;
    left: 20px;
    z-index: -1;
    transition: var(--transition-speed);
    border-radius: 4px;
}

.about-img-wrapper:hover::after {
    top: 15px;
    left: 15px;
}

.about-image img {
    position: relative;
    border-radius: 4px;
    /* mix-blend-mode: multiply; removed tint effect */
    /* filter: grayscale(100%) contrast(1); removed grayscale */
    transition: var(--transition-speed);
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

/* Removed hover effect since image is now always natural color 
.about-image:hover img {
    filter: none;
    mix-blend-mode: normal;
} 
*/

/* Projects Grid */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    justify-content: center; /* Center grid items */
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition-speed);
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 10px 30px -10px rgba(0,0,0,0.5);
}

.project-visual {
    height: 200px;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    border-bottom: 1px solid var(--border);
}

.project-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Placeholder for simulation visual */
.simulation-placeholder {
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, #2a3544 0%, #161b22 100%);
    display: grid;
    place-items: center;
    color: var(--text-secondary);
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
}

.project-info {
    padding: 25px;
}

.project-info h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.project-info p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 4px 10px;
    border-radius: 20px;
}

/* Skills/Tech Stack */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.skill-category {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.skill-category h4 {
    color: var(--accent);
    margin-bottom: 15px;
    font-family: 'Fira Code', monospace;
}

.skill-list {
    list-style: none;
}

.skill-list li {
    margin-bottom: 8px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
}

.skill-list li::before {
    content: '▹';
    color: var(--accent);
    margin-right: 10px;
}

/* Footer */
footer {
    text-align: center;
    padding: 50px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border);
    margin-top: 50px;
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .site-header { padding: 20px; }
    .nav-links { display: none; } /* Mobile menu would go here */
    
    .about-content {
        display: block;
    }
    .about-image {
        margin-top: 50px;
        width: 70%;
        margin-left: auto;
        margin-right: auto;
    }
}

/* Modal Styles */
.modal {
    display: none; 
    position: fixed; 
    z-index: 2000; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.8); 
    backdrop-filter: blur(5px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: block;
    opacity: 1;
}

.modal-content {
    background-color: var(--bg-color);
    margin: 5% auto; 
    padding: 40px;
    border: 1px solid var(--border);
    width: 80%; 
    max-width: 900px;
    border-radius: 8px;
    position: relative;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    transform: translateY(-20px);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: translateY(0);
}

.close-modal {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.2s;
}

.close-modal:hover,
.close-modal:focus {
    color: var(--accent);
    text-decoration: none;
    cursor: pointer;
}

/* Modal Internal Layout */
.modal-header h2 {
    color: var(--accent);
    margin-bottom: 20px;
    font-family: 'Fira Code', monospace;
    font-size: 1.8rem;
}

.modal-body-content {
    color: var(--text-primary);
    line-height: 1.8;
}

.modal-media-container {
    margin: 30px 0;
    text-align: center;
}

.modal-media-container img, 
.modal-media-container video {
    max-width: 100%;
    max-height: 500px;
    border-radius: 4px;
    border: 1px solid var(--border);
}

.modal-equation {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
    border: 1px solid var(--border);
    overflow-x: auto;
}

/* Project Details Page */
.project-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.project-detail-hero {
    padding-top: 150px;
    padding-bottom: 50px;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border);
    margin-bottom: 50px;
}

.content-wrapper {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.project-detail-hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--accent);
    font-family: 'Fira Code', monospace;
}

.project-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px 100px;
}

.project-description {
    font-size: 1.1rem;
    color: var(--text-primary);
    line-height: 1.8;
}

.back-link {
    display: inline-block;
    margin-top: 50px;
    color: var(--accent);
    text-decoration: none;
    font-family: 'Fira Code', monospace;
    font-weight: bold;
    border: 1px solid var(--accent);
    padding: 10px 20px;
    border-radius: 4px;
    transition: var(--transition-speed);
}

.back-link:hover {
    background: var(--accent-glow);
}

.media-container video {
    width: 100%;
    margin: 20px 0;
    border-radius: 8px;
    border: 1px solid var(--border);
}

/* GitHub Button */
.project-links {
    margin-top: 30px;
    margin-bottom: 20px;
}

.github-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: #24292e;
    color: white;
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    transition: var(--transition-speed);
    border: 1px solid var(--border);
}

.github-button:hover {
    background: #2f363d;
    transform: translateY(-2px);
    border-color: var(--text-secondary);
}

/* Publications */
.publication-group {
    margin-bottom: 40px;
}

.publication-group h3 {
    color: var(--accent);
    margin-bottom: 20px;
    font-family: 'Fira Code', monospace;
    font-size: 1.2rem;
    border-left: 3px solid var(--accent);
    padding-left: 10px;
}

.publication-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 25px;
    margin-bottom: 15px;
    transition: var(--transition-speed);
}

.publication-card:hover {
    border-color: var(--accent);
    transform: translateX(5px);
}

.pub-title {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 8px;
    display: block;
    line-height: 1.4;
}

.pub-authors {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.pub-journal {
    color: var(--accent);
    font-size: 0.85rem;
    font-family: 'Fira Code', monospace;
    font-style: italic;
}

.pub-status {
    display: inline-block;
    background: var(--border);
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 10px;
    font-family: 'Fira Code', monospace;
}