/* CSS Variables for a modern, deep tech aesthetic from manish.html */
:root {
    --primary-color: #0B132B; 
    --secondary-color: #1C2541; 
    --accent-cyan: #00D4FF; 
    --accent-purple: #635BFF; 
    --accent-red: #FF4D4D; 
    --text-dark: #E0E6ED; 
    --text-muted: #8898AA;
    --bg-dark: #060B19;
    --bg-card: rgba(28, 37, 65, 0.7); 
    --bg-gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--bg-dark) 100%);
    --font-family: 'Inter', sans-serif;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.abstract-thumb {
    max-width: 100%;
    max-height: 200px;
    height: auto;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
    display: block;
    margin-bottom: 1rem;
    cursor: zoom-in;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.abstract-thumb:hover {
    transform: scale(1.02);
    border-color: var(--accent-cyan);
}

/* Header / Hero */
header {
    position: relative;
    padding: 8rem 0 6rem 0;
    background: radial-gradient(circle at 50% 100%, rgba(99, 91, 255, 0.15) 0%, rgba(6, 11, 25, 1) 70%);
    text-align: center;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    color: #fff;
    letter-spacing: -1px;
}

.hero-content h1 span {
    background: linear-gradient(90deg, #FFFFFF, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content .subtitle {
    font-size: 1.5rem;
    color: var(--accent-cyan);
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-muted);
}

/* Navigation */
nav {
    background: rgba(11, 19, 43, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    display: flex;
    justify-content: center;
    padding: 1rem 0;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Sections */
.section {
    padding: 5rem 0;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Cards (Glassmorphism) */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 212, 255, 0.3);
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

.contact-info {
    background: linear-gradient(145deg, rgba(28, 37, 65, 0.8), rgba(11, 19, 43, 0.9));
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.05);
}

.contact-info h3 {
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.contact-item {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-dark);
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple));
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.05);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.4rem;
    top: 2rem;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-cyan);
    box-shadow: 0 0 10px var(--accent-cyan);
}

.timeline-item h3 {
    color: #fff;
    margin-bottom: 0.5rem;
}

.timeline-item p {
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Grid Layouts */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 2rem;
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 212, 255, 0.3);
}

.project-header h3 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.project-content p {
    color: var(--text-muted);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.skill-category h3 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
}

.skill-item {
    background: rgba(255,255,255,0.05);
    padding: 0.5rem 1rem;
    margin: 0.5rem 0.5rem 0.5rem 0;
    border-radius: 25px;
    display: inline-block;
    font-size: 0.9rem;
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-dark);
    transition: all 0.3s ease;
}

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

.publication {
    border-left: 4px solid var(--accent-cyan);
    padding-left: 1.5rem;
    margin-bottom: 2rem;
}

.publication h4 {
    color: #fff;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.publication .journal {
    color: var(--accent-purple);
    font-weight: 500;
}

.impact-factor {
    background: rgba(99, 91, 255, 0.2);
    color: var(--accent-cyan);
    padding: 0.2rem 0.6rem;
    border-radius: 15px;
    font-size: 0.8rem;
    margin-left: 0.5rem;
    border: 1px solid var(--accent-purple);
}

.stat-highlight {
    font-size: 1.2rem;
    color: #fff;
    text-align: center;
    margin-top: 3rem;
    padding: 1.5rem;
    background: linear-gradient(90deg, rgba(99, 91, 255, 0.1), rgba(0, 212, 255, 0.1));
    border-radius: 12px;
    border: 1px solid rgba(0, 212, 255, 0.3);
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.stat-highlight span {
    font-weight: 700;
    color: var(--accent-cyan);
}

/* Footer */
footer {
    background: #040812;
    padding: 3rem 0;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
}

@media (max-width: 768px) {
    .about-grid { grid-template-columns: 1fr; }
    .hero-content h1 { font-size: 2.5rem; }
    .nav-links { flex-wrap: wrap; gap: 1rem; justify-content: center; }
}