:root {
    --color-bg: #0a0e1a;
    --color-bg-lighter: #12182b;
    --color-text: #e8edf5;
    --color-text-light: #a0aec0;
    --color-border: #1e293b;
    --color-accent: #3b82f6;
    --color-accent-glow: rgba(59, 130, 246, 0.2);
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --spacing-unit: 1.5rem;
    --container-width: 1100px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    position: relative;
    overflow-x: hidden;
}

/* Dynamic Engineering Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    animation: gridMove 20s linear infinite;
    z-index: 0;
    pointer-events: none;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(147, 51, 234, 0.05) 0%, transparent 50%);
    animation: gradientShift 15s ease-in-out infinite;
    z-index: 0;
    pointer-events: none;
}

/* Circuit board pattern overlay */
.container::before {
    content: '';
    position: fixed;
    top: 0;
    right: 0;
    width: 500px;
    height: 500px;
    background-image:
        linear-gradient(90deg, transparent 48%, rgba(59, 130, 246, 0.04) 49%, rgba(59, 130, 246, 0.04) 51%, transparent 52%),
        linear-gradient(0deg, transparent 48%, rgba(59, 130, 246, 0.04) 49%, rgba(59, 130, 246, 0.04) 51%, transparent 52%);
    background-size: 100px 100px;
    border-radius: 50%;
    opacity: 0.3;
    animation: circuitRotate 30s linear infinite;
    z-index: 0;
    pointer-events: none;
}

@keyframes gridMove {
    0% {
        background-position: 0 0;
    }

    100% {
        background-position: 40px 40px;
    }
}

@keyframes gradientShift {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

@keyframes circuitRotate {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Ensure all content appears above background */
header,
main,
footer {
    position: relative;
    z-index: 1;
}

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

ul {
    list-style: none;
}

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

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border: 1px solid var(--color-accent);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: var(--color-accent-glow);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.primary-btn {
    background-color: var(--color-accent);
    color: var(--color-bg);
    border-color: var(--color-accent);
}

.primary-btn:hover {
    background-color: transparent;
    color: var(--color-accent);
    box-shadow: 0 0 20px var(--color-accent-glow);
}

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

.secondary-btn:hover {
    background-color: var(--color-bg-lighter);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Header */
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    padding-bottom: 2rem;
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.5px;
    color: var(--color-accent);
    text-shadow: 0 0 10px var(--color-accent-glow);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--color-text-light);
    position: relative;
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

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

/* Hero */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: 6rem var(--spacing-unit);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 1rem;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .tagline {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero .summary {
    margin-bottom: 2rem;
    color: var(--color-text-light);
    max-width: 500px;
}

.placeholder-img {
    background: linear-gradient(135deg, var(--color-bg-lighter) 0%, rgba(59, 130, 246, 0.1) 100%);
    width: 100%;
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    font-size: 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
}

/* Featured Projects Section */
.featured-projects {
    padding: 4rem var(--spacing-unit);
    border-top: 1px solid var(--color-border);
}

.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    letter-spacing: -0.5px;
    color: var(--color-accent);
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.featured-card {
    display: block;
    background: var(--color-bg-lighter);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
}

.featured-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
}

.featured-card:hover .project-image {
    opacity: 0.9;
}

.featured-card:hover h3 {
    color: var(--color-accent);
}

.featured-card .project-image {
    margin-bottom: 1rem;
    transition: opacity 0.3s ease;
}

.featured-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
    padding: 0 1rem;
    transition: var(--transition);
}

.featured-card p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    padding: 0 1rem 1rem;
}

.featured-card .project-tools {
    padding: 0 1rem 1rem;
}

/* Skills */
.skills {
    padding: 4rem var(--spacing-unit);
    border-top: 1px solid var(--color-border);
}

.skills h2 {
    color: var(--color-accent);
    margin-bottom: 2rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--color-bg-lighter);
    padding: 1.5rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: var(--transition);
}

.skill-category:hover {
    border-color: var(--color-accent);
    box-shadow: 0 5px 20px var(--color-accent-glow);
}

.skill-category h3 {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.skill-category li {
    margin-bottom: 0.5rem;
    color: var(--color-text-light);
}

/* Education */
.education {
    padding: 4rem var(--spacing-unit);
    border-top: 1px solid var(--color-border);
}

.education h2 {
    color: var(--color-accent);
    margin-bottom: 2rem;
}

.edu-item {
    max-width: 600px;
    background: var(--color-bg-lighter);
    padding: 2rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.edu-item h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.edu-item p {
    color: var(--color-text-light);
}

/* Projects Page */
.projects {
    padding: 4rem var(--spacing-unit);
}

.section-header {
    margin-bottom: 3rem;
}

.section-header h2 {
    color: var(--color-accent);
}

.section-subtitle {
    color: var(--color-text-light);
    margin-top: 0.5rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 3rem;
}

.project-card {
    display: flex;
    flex-direction: column;
    background: var(--color-bg-lighter);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
}

.project-image {
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    transition: transform 0.3s ease;
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: 0 1.5rem 1.5rem;
}

.project-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.project-desc {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.project-meta {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
}

/* Project Details Page */
.project-detail {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem var(--spacing-unit);
}

.detail-header {
    margin-bottom: 3rem;
}

.detail-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.detail-meta {
    color: var(--color-text-light);
    font-size: 1rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 2rem;
    margin-bottom: 2rem;
}

.detail-section {
    margin-bottom: 3rem;
}

.detail-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-accent);
}

.detail-section p {
    margin-bottom: 1rem;
    color: var(--color-text-light);
}

.detail-section ul {
    list-style: disc;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-text-light);
}

.detail-section li {
    margin-bottom: 0.5rem;
}

.detail-image {
    background: var(--color-bg-lighter);
    border: 1px solid var(--color-border);
    padding: 1rem;
    margin: 2rem 0 0.5rem 0;
    text-align: center;
    color: var(--color-text-light);
    border-radius: 4px;
}

.detail-caption {
    text-align: center;
    font-style: italic;
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

/* About Page */
.about-page {
    padding: 4rem var(--spacing-unit);
}

.about-page h2 {
    color: var(--color-accent);
    margin-bottom: 2rem;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.photo-item {
    position: relative;
    overflow: hidden;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--color-bg-lighter);
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.photo-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--color-bg-lighter);
    color: var(--color-text-light);
}

.photo-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(59, 130, 246, 0.9);
    color: #fff;
    padding: 1rem;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    font-size: 0.9rem;
}

.photo-item:hover .photo-overlay {
    transform: translateY(0);
}

.bio-section {
    max-width: 700px;
    border-top: 1px solid var(--color-border);
    padding-top: 3rem;
}

.bio-section p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-text-light);
}

/* Contact */
.contact {
    padding: 4rem var(--spacing-unit);
}

.contact h2 {
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info p {
    color: var(--color-text-light);
    margin-bottom: 2rem;
}

.contact-links li {
    margin-bottom: 0.8rem;
}

.contact-links a {
    color: var(--color-accent);
    transition: var(--transition);
}

.contact-links a:hover {
    text-decoration: underline;
}

.contact-form {
    background: var(--color-bg-lighter);
    padding: 2rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    border-radius: 4px;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

footer {
    text-align: center;
    padding: 3rem var(--spacing-unit);
    color: var(--color-text-light);
    font-size: 0.9rem;
    border-top: 1px solid var(--color-border);
    margin-top: 4rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: 3rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-image {
        order: -1;
        max-width: 400px;
        margin: 0 auto;
    }

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

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

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

    /* Mobile video optimization */
    video {
        max-width: 100%;
        height: auto;
    }

    .detail-image video {
        max-width: 100% !important;
    }

    /* Touch-friendly buttons */
    .btn {
        padding: 1rem 1.5rem;
        width: 100%;
        text-align: center;
    }

    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

    /* Reduce circuit animation on mobile for performance */
    .container::before {
        width: 300px;
        height: 300px;
        opacity: 0.2;
    }

    /* Better spacing on mobile */
    .container {
        padding: 0 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }
}