:root {
    /* Colors */
    --bg-color: #050505;
    --surface-color: #111111;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-color: #00FF55;
    /* Vibrant Green */
    --accent-hover: #00cc44;
    --border-color: #222;

    /* Typography */
    --font-sans: 'Inter', sans-serif;
    /* Removed Serif */

    /* Spacing */
    --container-width: 1200px;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Transitions */
    --transition-fast: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

ul {
    list-style: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
    font-family: var(--font-sans);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.nav-list {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #000;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    margin-left: var(--spacing-sm);
}

.btn-outline:hover {
    border-color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

/* Sections */
.section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-family: var(--font-sans);
    font-weight: 800;
    letter-spacing: -0.03em;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    padding-top: 120px;
    text-align: center;
    background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(0, 255, 85, 0.06), transparent 40%);
}

.hero-content {
    max-width: 900px;
    z-index: 1;
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-subtitle {
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.hero-title {
    font-family: var(--font-sans);
    font-weight: 900;
    letter-spacing: -0.04em;
    font-size: 5.5rem;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    opacity: 0;
    animation: fadeInUp 1s ease-out forwards 0.2s;
}

.hero-title .highlight {
    background: linear-gradient(90deg, #ffffff 0%, var(--text-secondary) 20%, #ffffff 40%, #ffffff 100%);
    background-size: 200% auto;
    color: transparent;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: shine 4s linear infinite;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    max-width: 700px;
}

/* Hero Visual (Abstract Chart & Profile) */
.hero-visual {
    position: relative;
    right: auto;
    top: auto;
    transform: none;
    width: 500px;
    height: 500px;
    z-index: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.profile-image-container {
    position: relative;
    width: 450px;
    height: 450px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--accent-color);
    box-shadow: 0 0 50px rgba(0, 255, 85, 0.2);
    z-index: 2;
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.chart-visual {
    position: absolute;
    bottom: -20px;
    right: -20px;
    display: flex;
    align-items: flex-end;
    gap: 15px;
    z-index: 1;
}

.chart-visual .bar {
    width: 30px;
    background: linear-gradient(to top, var(--surface-color), var(--accent-color));
    border-radius: 4px 4px 0 0;
    opacity: 0.9;
    animation: grow 2s ease-out forwards;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
}

.bar-1 {
    height: 100px;
    animation-delay: 0.2s;
}

.bar-2 {
    height: 180px;
    animation-delay: 0.4s;
}

.bar-3 {
    height: 140px;
    animation-delay: 0.6s;
}

@keyframes grow {
    from {
        height: 0;
        opacity: 0;
    }
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.skills-list {
    margin-top: var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.skills-list li {
    display: flex;
    align-items: center;
    color: var(--text-secondary);
}

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

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.stat-card {
    background-color: var(--surface-color);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    background-color: var(--surface-color);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

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

.project-image {
    height: 200px;
    background-color: #222;
    /* Placeholder */
    background-image: linear-gradient(45deg, #222 25%, #2a2a2a 25%, #2a2a2a 50%, #222 50%, #222 75%, #2a2a2a 75%, #2a2a2a 100%);
    background-size: 20px 20px;
}

.project-content {
    padding: var(--spacing-md);
}

.project-content h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.project-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.link-arrow {
    color: var(--accent-color);
    font-weight: 500;
    font-size: 0.9rem;
}

/* Contact */
.contact-wrapper {
    text-align: center;
    max-width: 600px;
}

.email-link {
    display: inline-block;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 5px;
    margin-top: var(--spacing-md);
}

.email-link:hover {
    color: var(--accent-color);
}

/* Footer */
.footer {
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

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

    .hero-visual {
        display: none;
        /* Hide visual on mobile for simplicity or adjust */
    }
}

/* Animations */
.fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    will-change: opacity, visibility;
}

.fade-in-section.visible {
    opacity: 1;
    transform: none;
}

/* Project Details Page */
.project-hero {
    padding-top: 120px;
    padding-bottom: var(--spacing-md);
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

.back-link {
    display: inline-block;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.project-title {
    font-family: var(--font-sans);
    font-weight: 800;
    letter-spacing: -0.03em;
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.project-subtitle {
    color: var(--accent-color);
    font-size: 1.2rem;
}

.project-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

.project-image-large {
    width: 100%;
    height: 400px;
    background-color: #222;
    background-image: linear-gradient(45deg, #222 25%, #2a2a2a 25%, #2a2a2a 50%, #222 50%, #222 75%, #2a2a2a 75%, #2a2a2a 100%);
    background-size: 30px 30px;
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
}

.content-block {
    margin-bottom: var(--spacing-md);
}

.content-block h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.content-block p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.content-block ul {
    list-style: disc;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.content-block li {
    margin-bottom: 0.5rem;
}

.sidebar-widget {
    background-color: var(--surface-color);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-md);
}

.sidebar-widget h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.project-meta li {
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.project-meta strong {
    color: var(--text-primary);
}

.result-item {
    margin-bottom: 1rem;
}

.result-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.result-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.contact-cta {
    text-align: center;
    background-color: var(--surface-color);
    margin-top: var(--spacing-lg);
}

.contact-cta h2 {
    margin-bottom: 1rem;
}

.contact-cta p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* Download Links */
.download-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    transition: background-color 0.3s ease, color 0.3s ease;
    border: 1px solid transparent;
}

.download-link:hover {
    background-color: rgba(0, 212, 255, 0.1);
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.download-link svg {
    stroke: var(--accent-color);
}

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

    .project-title {
        font-size: 2rem;
    }
}

/* Spreadsheet Animation */
.contact {
    position: relative;
    overflow: hidden;
}

.spreadsheet-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    grid-auto-rows: 40px;
    opacity: 0.1;
    z-index: 0;
    pointer-events: none;
    transform: perspective(500px) rotateX(20deg) scale(1.2);
    transform-origin: center bottom;
}

.cell {
    border: 1px solid var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 10px;
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--accent-color);
    background-color: rgba(0, 212, 255, 0.02);
    transition: background-color 0.5s ease, color 0.5s ease;
}

.cell.active {
    background-color: var(--accent-color);
    color: #000;
    font-weight: bold;
}

.contact-wrapper {
    position: relative;
    z-index: 1;
    background-color: rgba(10, 10, 10, 0.8);
    /* Backdrop for readability */
    padding: var(--spacing-lg);
    border-radius: 16px;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Skills Carousel */
.skills-carousel-container {
    margin-top: var(--spacing-xl);
    text-align: center;
    overflow: hidden;
}

.skills-title {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.skills-carousel {
    position: relative;
    width: 100%;
    overflow: hidden;
    padding: 20px 0;
    /* Mask for fade effect on edges */
    mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.skills-track {
    display: flex;
    gap: var(--spacing-md);
    width: max-content;
    animation: scroll 30s linear infinite;
}

.skills-track:hover {
    animation-play-state: paused;
}

.skill-item {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
    transition: var(--transition-fast);
}

.skill-item:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 212, 255, 0.1);
}

.skill-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.skill-name {
    font-weight: 600;
    color: var(--text-primary);
}

@keyframes scroll {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(-50%);
        /* Move half the width (original items) */
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes shine {
    to {
        background-position: 200% center;
    }
}