/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #00d4ff;
    --secondary-color: #0099cc;
    --accent-color: #ff6b35;
    --dark-bg: #0a0a0a;
    --darker-bg: #000000;
    --light-text: #ffffff;
    --gray-text: #b8b8b8;
    --section-bg: #111111;
    --card-bg: #1a1a1a;
    --border-color: #333333;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background: var(--dark-bg);
    color: var(--light-text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Navigation */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
}

#navbar.scrolled {
    background: rgba(0, 0, 0, 0.98);
    box-shadow: 0 2px 20px rgba(0, 212, 255, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

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

.nav-link {
    color: var(--gray-text);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
    text-shadow: 0 0 5px rgba(0, 212, 255, 0.5);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 107, 53, 0.1) 0%, transparent 50%);
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.8rem;
    color: var(--gray-text);
    margin-bottom: 1rem;
    font-weight: 300;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--gray-text);
    margin-bottom: 2rem;
}

.hero-contact {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-text);
    text-decoration: none;
    padding: 0.8rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 50px;
    transition: all 0.3s ease;
}

.contact-item:hover {
    color: var(--primary-color);
    background: rgba(0, 212, 255, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 212, 255, 0.2);
}

/* Tech Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.tech-circle {
    position: relative;
    width: 300px;
    height: 300px;
}

.orbit {
    position: absolute;
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.orbit-1 {
    width: 100%;
    height: 100%;
    animation-duration: 20s;
}

.orbit-2 {
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
    animation-duration: 15s;
    animation-direction: reverse;
}

.orbit-3 {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    animation-duration: 10s;
}

.center-dot {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 20px var(--primary-color);
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Main Content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
    margin-bottom: 2rem;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--light-text);
}

.section-line {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    margin: 0 auto;
}

.section-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--gray-text);
}

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

.research-item {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.research-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.research-item:hover::before {
    left: 100%;
}

.research-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.2);
}

.research-item i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.research-item h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--light-text);
}

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

.project-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 53, 0.1), transparent);
    transition: left 0.5s ease;
}

.project-card:hover::before {
    left: 100%;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px rgba(255, 107, 53, 0.2);
}

.project-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-color), #ff8c42);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.project-icon i {
    font-size: 1.5rem;
    color: white;
}

.project-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--light-text);
}

/* More Projects Link */
.more-projects {
    text-align: center;
    margin-top: 3rem;
}

.more-projects-link {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--dark-bg);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}

.more-projects-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.4);
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

/* Publications */
.publication-list {
    max-width: 800px;
    margin: 0 auto;
}

.publication-item {
    display: flex;
    margin-bottom: 2rem;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 15px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.publication-item:hover {
    transform: translateX(5px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.1);
}

.publication-year {
    min-width: 80px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-right: 2rem;
}

.publication-content h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--light-text);
    line-height: 1.4;
}

.publication-venue {
    color: var(--gray-text);
    margin-bottom: 1rem;
}

.publication-links {
    display: flex;
    gap: 1rem;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(0, 212, 255, 0.1);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.pub-link:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
    transform: translateY(-2px);
}

/* Awards Timeline */
.awards-timeline {
    max-width: 600px;
    margin: 0 auto;
}

.award-item {
    display: flex;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: 15px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.award-item:hover {
    transform: translateY(-3px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px rgba(255, 107, 53, 0.1);
}

.award-year {
    min-width: 100px;
    font-weight: 700;
    color: var(--accent-color);
    margin-right: 1.5rem;
}

.award-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.award-content i {
    color: var(--accent-color);
    font-size: 1.2rem;
}

/* Footer */
.footer {
    background: var(--darker-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    color: var(--gray-text);
}

/* Projects Page Styles */
.projects-hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
    text-align: center;
    position: relative;
}

.projects-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 70%, rgba(0, 212, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(255, 107, 53, 0.05) 0%, transparent 50%);
}

.projects-hero-content {
    position: relative;
    z-index: 2;
}

.projects-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.projects-subtitle {
    font-size: 1.3rem;
    color: var(--gray-text);
    max-width: 600px;
    margin: 0 auto;
}

.project-detail {
    background: var(--card-bg);
    border-radius: 15px;
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.project-detail:hover {
    transform: translateY(-3px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.1);
}

.project-header {
    margin-bottom: 2rem;
}

.project-title {
    font-size: 1.8rem;
    color: var(--light-text);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.project-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.project-role {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.1rem;
}

.project-duration {
    color: var(--gray-text);
    font-size: 1rem;
}

.project-achievements {
    list-style: none;
    padding: 0;
}

.project-achievements li {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
    position: relative;
    color: var(--gray-text);
    line-height: 1.6;
}

.project-achievements li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-size: 0.8rem;
    top: 0.3rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--primary-color);
    text-decoration: none;
    margin-left: 0.5rem;
    padding: 0.3rem 0.8rem;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 15px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.project-link:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
    transform: translateY(-1px);
}

.back-to-home {
    text-align: center;
    margin: 3rem 0;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.05);
    color: var(--gray-text);
    text-decoration: none;
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.back-link:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background: rgba(0, 212, 255, 0.1);
    transform: translateY(-2px);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.4rem;
    }
    
    .tech-circle {
        width: 200px;
        height: 200px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .research-grid,
    .project-grid {
        grid-template-columns: 1fr;
    }
    
    .publication-item {
        flex-direction: column;
    }
    
    .publication-year {
        margin-right: 0;
        margin-bottom: 1rem;
    }
    
    .award-item {
        flex-direction: column;
        text-align: center;
    }
    
    .award-year {
        margin-right: 0;
        margin-bottom: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-contact {
        flex-direction: column;
        align-items: center;
    }
    
    .projects-title {
        font-size: 2.2rem;
    }
    
    .projects-subtitle {
        font-size: 1.1rem;
    }
    
    .project-detail {
        padding: 1.5rem;
    }
    
    .project-title {
        font-size: 1.4rem;
    }
    
    .project-meta {
        text-align: center;
    }
    
    .project-achievements li {
        padding-left: 1.5rem;
    }
}