:root {
    --bg-color: #050505;
    --text-color: #e0e0e0;
    --accent-color: #ffe135;
    /* Batman Yellow */
    --secondary-bg: #121212;
    --card-bg: #1a1a1a;
    --hover-color: #d4af37;
    --font-main: 'Inter', sans-serif;
    --font-header: 'Oswald', sans-serif;
    /* Strong, imposing font */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --bat-shadow: 0 0 20px rgba(255, 225, 53, 0.1);
    --border-color: #333;
}

@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;700&display=swap');

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    background-image:
        radial-gradient(circle at 50% 50%, #1a1a1a 0%, #050505 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
.logo {
    font-family: var(--font-header);
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

ul {
    list-style: none;
}

/* Header & Nav */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(5, 5, 5, 0.95);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
    text-shadow: 0 0 10px rgba(255, 225, 53, 0.5);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 1rem;
    font-weight: 500;
    color: #888;
    position: relative;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-color);
    text-shadow: 0 0 8px rgba(255, 225, 53, 0.4);
}

.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger span {
    background-color: var(--accent-color);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 2rem;
    position: relative;
    overflow: hidden;
}

/* Bat-Signal / Spotlight Effect Background */
.hero::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 30%, rgba(60, 60, 60, 0.4) 0%, rgba(5, 5, 5, 1) 70%);
    z-index: -1;
    top: 0;
    left: 0;
}

.hero h1 {
    font-size: 5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #fff;
    text-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
}

.subtitle {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 3rem;
    font-weight: 400;
    letter-spacing: 2px;
    text-shadow: 0 0 5px rgba(255, 225, 53, 0.3);
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.btn {
    padding: 1rem 3rem;
    font-weight: 700;
    transition: var(--transition);
    font-size: 1rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    clip-path: polygon(10% 0, 100% 0, 100% 70%, 90% 100%, 0 100%, 0 30%);
}

.btn.primary {
    background-color: var(--accent-color);
    color: #000;
    border: none;
}

.btn.primary:hover {
    background-color: #fff;
    box-shadow: 0 0 15px var(--accent-color);
}

.btn.secondary {
    background: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
}

.btn.secondary:hover {
    background-color: rgba(255, 225, 53, 0.1);
    box-shadow: 0 0 10px var(--accent-color);
}

/* Sections General */
.section {
    padding: 6rem 2rem;
    border-top: 1px solid #111;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

.section-title {
    font-size: 3rem;
    margin-bottom: 4rem;
    text-align: center;
    position: relative;
    color: #fff;
}

.section-title::after {
    content: '';
    display: block;
    width: 100px;
    height: 4px;
    background-color: var(--accent-color);
    margin: 1rem auto 0;
    box-shadow: 0 0 10px var(--accent-color);
}

/* About */
.about-content {
    text-align: center;
    font-size: 1.2rem;
    color: #ccc;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
    background: var(--card-bg);
    padding: 3rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Skills */
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

.skill-item {
    background-color: var(--secondary-bg);
    padding: 1rem 2rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    color: #aaa;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.skill-item:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 0 15px rgba(255, 225, 53, 0.2);
    transform: translateY(-5px);
}

/* Experience Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 2px;
    background-color: #333;
}

.timeline-item {
    position: relative;
    padding-left: 3rem;
    margin-bottom: 4rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    background-color: #000;
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 10px var(--accent-color);
    transform: rotate(45deg);
    /* Diamond shape */
}

.timeline-content {
    background: var(--card-bg);
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.timeline-content:hover {
    border-color: var(--accent-color);
    transform: translateX(10px);
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
    text-transform: uppercase;
}

.timeline-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #fff;
}

.timeline-content h4 {
    color: #888;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.timeline-content ul {
    list-style: none;
    color: #ccc;
}

.timeline-content li {
    margin-bottom: 0.8rem;
    position: relative;
    padding-left: 1.5rem;
}

.timeline-content li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-size: 1.2rem;
    line-height: 1;
}

.timeline-content a {
    color: var(--accent-color);
    border-bottom: 1px solid transparent;
}

.timeline-content a:hover {
    border-bottom-color: var(--accent-color);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.project-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-color);
    box-shadow: 0 0 20px rgba(255, 225, 53, 0.1);
}

.project-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: #fff;
}

.project-card p {
    color: #bbb;
    margin-bottom: 2rem;
}

.project-link {
    display: inline-block;
    color: var(--accent-color);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.project-link:hover {
    text-shadow: 0 0 5px var(--accent-color);
}

/* Research */
.research-item {
    background: var(--card-bg);
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    transition: var(--transition);
}

.research-item:hover {
    border-color: var(--accent-color);
}

.research-item h3 {
    margin-bottom: 1rem;
    color: #fff;
}

.research-item a {
    color: var(--accent-color);
    display: inline-block;
    margin-top: 1rem;
}

/* Education */
.education-list {
    display: grid;
    gap: 2rem;
}

.education-item {
    background: var(--card-bg);
    padding: 2rem;
    border-left: 4px solid var(--accent-color);
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.education-item:hover {
    background: #222;
    transform: translateX(10px);
}

.education-item h3 {
    font-size: 1.3rem;
    color: #fff;
}

.education-item .institution {
    display: block;
    color: #888;
    margin: 0.4rem 0;
    font-size: 1.1rem;
}

.education-item .year {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 700;
}

/* Contact */
.contact-info {
    text-align: center;
    background: var(--card-bg);
    padding: 4rem;
    border: 1px solid var(--border-color);
    max-width: 700px;
    margin: 0 auto;
}

.contact-link {
    display: block;
    font-size: 2rem;
    color: var(--accent-color);
    margin: 2rem 0;
    font-weight: 700;
    font-family: var(--font-header);
}

.contact-link:hover {
    text-shadow: 0 0 15px var(--accent-color);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
}

.social-links a {
    font-size: 1.1rem;
    padding: 1rem 2rem;
    border: 1px solid var(--border-color);
    background: #000;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.social-links a:hover {
    background: var(--accent-color);
    color: #000;
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-color);
}

/* Footer */
.footer {
    text-align: center;
    padding: 3rem;
    color: #555;
    font-size: 0.9rem;
    border-top: 1px solid #111;
    background: #000;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 {
    transition-delay: 0.1s;
}

.delay-2 {
    transition-delay: 0.2s;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 3.5rem;
    }

    .section {
        padding: 4rem 1.5rem;
    }

    .nav-links {
        position: fixed;
        right: 0;
        top: 0;
        height: 100vh;
        background-color: #000;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        width: 80%;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        border-left: 1px solid var(--accent-color);
    }

    .nav-links.nav-active {
        transform: translateX(0%);
    }

    .hamburger {
        display: block;
        z-index: 1001;
    }

    .hamburger span {
        display: block;
        width: 30px;
        height: 3px;
        margin: 6px;
        background-color: var(--accent-color);
        transition: all 0.3s ease;
    }

    .toggle .line1 {
        transform: rotate(-45deg) translate(-6px, 7px);
    }

    .toggle .line2 {
        opacity: 0;
    }

    .toggle .line3 {
        transform: rotate(45deg) translate(-6px, -7px);
    }
}