:root {
    --primary-color: #00d9ff;
    --primary-dark: #00a8cc;
    --secondary-color: #ff6b35;
    --accent-color: #00ff88;
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --text-light: #808080;
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --border-color: #2a2a2a;
    --gradient-start: #00d9ff;
    --gradient-end: #00ff88;
    --shadow-sm: 0 2px 8px rgba(0, 217, 255, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 217, 255, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 217, 255, 0.2);
    --shadow-xl: 0 16px 48px rgba(0, 217, 255, 0.25);
    --glow: 0 0 20px rgba(0, 217, 255, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'SF Mono', monospace;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 217, 255, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 255, 136, 0.03) 0%, transparent 50%);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

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

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(0, 217, 255, 0.5);
    letter-spacing: 2px;
    font-family: 'SF Mono', monospace;
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 1px;
}

.nav-menu a::before {
    content: '>';
    position: absolute;
    left: -1.5rem;
    opacity: 0;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.nav-menu a:hover {
    color: var(--primary-color);
    text-shadow: 0 0 8px rgba(0, 217, 255, 0.5);
}

.nav-menu a:hover::before {
    opacity: 1;
    left: -1rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    text-align: left;
    padding: 8rem 2rem 4rem;
    position: relative;
    max-width: 1400px;
    margin: 0 auto;
}

.hero-content {
    max-width: 900px;
    animation: fadeInUp 0.8s ease;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(3.5rem, 10vw, 6.5rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1;
    letter-spacing: -2px;
}

.gradient-text {
    color: var(--primary-color);
    text-shadow: 
        0 0 20px rgba(0, 217, 255, 0.5),
        0 0 40px rgba(0, 217, 255, 0.3);
    position: relative;
    display: inline-block;
}

.gradient-text::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    box-shadow: 0 0 10px rgba(0, 217, 255, 0.8);
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.875rem;
}

.hero-description {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: 3rem;
    line-height: 1.8;
    max-width: 700px;
    font-weight: 300;
}

.hero-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
    padding: 0.875rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    transition: left 0.3s ease;
    z-index: -1;
}

.btn-primary:hover {
    color: var(--bg-primary);
    box-shadow: var(--glow);
    transform: translateY(-2px);
}

.btn-primary:hover::before {
    left: 0;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    position: relative;
}

.btn-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: var(--bg-tertiary);
    transition: width 0.3s ease;
    z-index: -1;
}

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

.btn-secondary:hover::before {
    width: 100%;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--primary-color);
    border-radius: 0;
    position: relative;
    box-shadow: 0 0 10px rgba(0, 217, 255, 0.5);
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 0;
    animation: scroll 2s infinite;
    box-shadow: 0 0 5px rgba(0, 217, 255, 0.8);
}

/* Sections */
.section {
    padding: 6rem 0;
}

.section-alt {
    background-color: var(--bg-secondary);
    position: relative;
}

.section-alt::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0.3;
}

.section-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    margin-bottom: 4rem;
    text-align: left;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 3px;
    position: relative;
    display: inline-block;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    box-shadow: 0 0 10px rgba(0, 217, 255, 0.8);
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 3rem;
    text-align: left;
    max-width: 800px;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.skill-tag {
    padding: 0.625rem 1.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.skill-tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    transition: left 0.3s ease;
    z-index: -1;
}

.skill-tag:hover {
    color: var(--bg-primary);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.skill-tag:hover::before {
    left: 0;
}

/* Timeline */
.timeline {
    max-width: 900px;
    margin: 0;
    position: relative;
    padding-left: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    box-shadow: 0 0 10px rgba(0, 217, 255, 0.5);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-marker {
    position: absolute;
    left: -3.25rem;
    top: 0.5rem;
    width: 16px;
    height: 16px;
    border-radius: 0;
    background: var(--primary-color);
    border: 3px solid var(--bg-primary);
    box-shadow: var(--glow);
    transform: rotate(45deg);
}

.timeline-content {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 0;
    border-left: 3px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.timeline-content:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(10px);
    border-left-color: var(--accent-color);
    background: var(--bg-tertiary);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.timeline-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.timeline-company {
    color: var(--accent-color);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 1px;
}

.timeline-date {
    display: block;
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.timeline-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 0;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    opacity: 0;
    transform: translateY(20px);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: rgba(0, 217, 255, 0.05);
    transition: width 0.3s ease;
    z-index: 0;
}

.project-card > * {
    position: relative;
    z-index: 1;
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
    border-top-color: var(--accent-color);
    border-color: var(--primary-color);
}

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

.project-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.project-date {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-tags span {
    padding: 0.25rem 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 1rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Publications */
.publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.publication-item {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 0;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-color);
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateX(-20px);
    position: relative;
}

.publication-item::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 100%;
    background: rgba(0, 255, 136, 0.05);
    transition: width 0.3s ease;
    z-index: 0;
}

.publication-item > * {
    position: relative;
    z-index: 1;
}

.publication-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.publication-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(10px);
    border-left-color: var(--accent-color);
}

.publication-item:hover::before {
    width: 100%;
}

.publication-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.publication-venue {
    color: var(--accent-color);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.publication-abstract {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Education */
.education-item {
    max-width: 800px;
    margin: 0;
    text-align: left;
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 0;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
}

.education-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.education-degree {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.education-date {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.education-activities {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Contact */
.contact-description {
    text-align: left;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.contact-links {
    display: flex;
    justify-content: flex-start;
    gap: 2rem;
    flex-wrap: wrap;
}

.contact-link {
    padding: 1rem 2.5rem;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 0;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
}

.contact-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    transition: left 0.3s ease;
    z-index: -1;
}

.contact-link:hover {
    border-color: var(--primary-color);
    color: var(--bg-primary);
    transform: translateY(-3px);
    box-shadow: var(--glow);
}

.contact-link:hover::before {
    left: 0;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-light);
    font-size: 0.875rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(15px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-secondary);
        width: 100%;
        text-align: left;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: 2rem;
        border-top: 1px solid var(--border-color);
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .container {
        padding: 0 1.5rem;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
        text-align: left;
    }

    .section {
        padding: 4rem 0;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-marker {
        left: -1.75rem;
    }

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

    .hero-links {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-primary,
    .btn-secondary {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 2rem;
        text-align: left;
    }

    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
    }
}