/* Global Reset & Variables */
:root {
    --bg-color: #05050a;
    --card-bg: rgba(20, 20, 28, 0.66);
    --text-primary: rgba(255, 255, 255, 0.92);
    --text-secondary: rgba(255, 255, 255, 0.66);
    --accent-cyan: #22e7ff;
    --accent-purple: #b47bff;
    --accent-green: #37ffb2;
    --glass-border: rgba(255, 255, 255, 0.12);
    --glow-cyan: 0 0 24px rgba(34, 231, 255, 0.25);
    --glow-purple: 0 0 24px rgba(180, 123, 255, 0.22);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.55);
    --radius-lg: 16px;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-sans: 'Inter', sans-serif;
}

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

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

body {
    background:
        radial-gradient(900px 600px at 15% 10%, rgba(34, 231, 255, 0.08), transparent 55%),
        radial-gradient(900px 600px at 85% 20%, rgba(180, 123, 255, 0.08), transparent 55%),
        radial-gradient(800px 600px at 60% 90%, rgba(55, 255, 178, 0.05), transparent 60%),
        var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body.nav-open {
    overflow: hidden;
}

/* Background Grid Effect */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        linear-gradient(rgba(34, 231, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(34, 231, 255, 0.025) 1px, transparent 1px);
    background-size: 56px 56px;
    z-index: -1;
    pointer-events: none;
}

/* Typography */
h1,
h2,
h3,
h4 {
    font-family: var(--font-sans);
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.icon {
    width: 1em;
    height: 1em;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    display: inline-block;
    vertical-align: -0.15em;
    flex-shrink: 0;
}

.icon-sprite {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

.muted {
    color: var(--text-secondary);
}

.lead {
    font-size: 1.05rem;
    line-height: 1.7;
}

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

.skip-link {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 10px 14px;
    background: rgba(0, 0, 0, 0.8);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    transform: translateY(-150%);
    transition: transform 0.2s ease;
    z-index: 2000;
}

.skip-link:focus {
    transform: translateY(0);
}

*:focus-visible {
    outline: 2px solid rgba(34, 231, 255, 0.65);
    outline-offset: 2px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(5, 5, 10, 0.75);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    padding: 0.9rem 0;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}

.nav-brand {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 18px rgba(34, 231, 255, 0.22);
    letter-spacing: 0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.2rem;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
    min-width: 0;
    row-gap: 0.4rem;
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-secondary);
    position: relative;
    letter-spacing: 0.16em;
}

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

.nav-link:hover {
    color: var(--accent-cyan);
}

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

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

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

/* Hero Section */
.hero {
    min-height: 100svh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 96px;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(180, 123, 255, 0.16) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
    filter: blur(50px);
}

.hero-title {
    font-size: clamp(2.8rem, 6vw, 4.6rem);
    margin-bottom: 1rem;
    line-height: 1.1;
    font-weight: 700;
}

.hero-title span {
    color: var(--accent-cyan);
    text-shadow: var(--glow-cyan);
}

.hero-subtitle {
    font-size: clamp(1.05rem, 2.1vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-weight: 300;
}

.hero-description {
    max-width: 820px;
    margin: 0 auto 1.8rem;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
}

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

.btn {
    padding: 12px 30px;
    border-radius: 12px;
    font-family: var(--font-mono);
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    z-index: 1;
    border: 1px solid transparent;
}

.btn-primary {
    background: transparent;
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: 0 0 14px rgba(34, 231, 255, 0.12);
}

.btn-primary:hover {
    background: rgba(34, 231, 255, 0.1);
    box-shadow: 0 0 26px rgba(34, 231, 255, 0.22);
}

.btn-secondary {
    background: transparent;
    border-color: var(--accent-purple);
    color: var(--accent-purple);
    box-shadow: 0 0 14px rgba(180, 123, 255, 0.12);
}

.btn-secondary:hover {
    background: rgba(180, 123, 255, 0.1);
    box-shadow: 0 0 26px rgba(180, 123, 255, 0.22);
}

.hero-links {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.hero-link {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 10px 14px;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.hero-link:hover {
    color: var(--text-primary);
    border-color: rgba(34, 231, 255, 0.35);
    box-shadow: 0 0 24px rgba(34, 231, 255, 0.08);
}

/* Sections */
section {
    padding: clamp(72px, 10vh, 110px) 0;
    scroll-margin-top: 96px;
}

.section-title {
    font-size: clamp(1.9rem, 3.5vw, 2.5rem);
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    margin: 10px auto 0;
    border-radius: 2px;
}

/* Cards (Glassmorphism) */
.card-style {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.card-style:hover {
    transform: translateY(-5px);
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-lg);
}

.card-title {
    font-family: var(--font-sans);
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
}

.stats {
    margin-top: 1.8rem;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}

.stat {
    text-align: center;
    padding: 1rem 1rem;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.03);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.45rem;
    color: var(--text-primary);
    text-shadow: var(--glow-cyan);
}

.stat-label {
    margin-top: 0.35rem;
    font-size: 0.86rem;
    color: var(--text-secondary);
}

/* Publications Card */
.publications-card {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.publications-content {
    flex: 1;
}

.publications-title {
    font-family: var(--font-sans);
    font-size: 1.25rem;
    margin-bottom: 0.35rem;
    color: var(--accent-cyan);
}

.publications-subtitle {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    margin-bottom: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.publications-cta {
    text-align: center;
}

.education-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
}

.education-school {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.education-degree {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.education-meta {
    margin-top: 0.75rem;
}

.pill {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    border: 1px solid rgba(34, 231, 255, 0.28);
    color: var(--accent-cyan);
    background: rgba(34, 231, 255, 0.08);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.bullet-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0;
    display: grid;
    gap: 0.6rem;
    color: var(--text-secondary);
}

.bullet-list li {
    position: relative;
    padding-left: 1.2rem;
}

.bullet-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent-cyan);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0 0;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-purple));
    opacity: 0.3;
}

.timeline-item {
    margin-bottom: 4rem;
    position: relative;
    width: 100%;
    display: flex;
    justify-content: center;
    padding-top: 2.8rem;
}

.timeline-content {
    width: 45%;
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    backdrop-filter: blur(10px);
    position: relative;
    transition: all 0.3s ease;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: auto;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
}

.timeline-date {
    position: absolute;
    top: 0;
    transform: none;
    background: var(--bg-color);
    padding: 0.5rem 1rem;
    border: 1px solid var(--accent-cyan);
    border-radius: 20px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-cyan);
    z-index: 2;
    white-space: normal;
    max-width: calc(50% - 24px);
    line-height: 1.3;
}

.timeline-item:nth-child(odd) .timeline-date {
    left: 0;
    text-align: left;
}

.timeline-item:nth-child(even) .timeline-date {
    right: 0;
    text-align: right;
}

.timeline-content:hover {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 26px rgba(34, 231, 255, 0.1);
}

.timeline-content h3 {
    color: var(--accent-cyan);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.timeline-content h4 {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-family: var(--font-sans);
    font-weight: 400;
}

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

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-lg);
}

.project-icon {
    font-size: 2rem;
    color: var(--accent-cyan);
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-family: var(--font-sans);
}

.project-role {
    font-size: 0.9rem;
    color: var(--accent-purple);
    margin-bottom: 1rem;
    font-weight: 600;
}

.project-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    margin-bottom: 1rem;
}

.project-card .tag-list {
    margin-top: auto;
    margin-bottom: 0.25rem;
}

.tag {
    background: rgba(255, 255, 255, 0.05);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--accent-green);
    border: 1px solid rgba(55, 255, 178, 0.22);
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.project-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.project-links a:hover {
    color: var(--text-primary);
}

.project-links-column {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
}

.project-link-muted {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.85;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    backdrop-filter: blur(10px);
}

.skill-category h3 {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    color: var(--accent-purple);
}

.skill-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.9rem;
    border: 1px solid var(--glass-border);
}

/* Contact */
.contact-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 2rem;
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.contact-item:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-3px);
}

.contact-item .icon {
    color: var(--accent-cyan);
    font-size: 1.2rem;
}

.contact-item-static {
    cursor: default;
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--glass-border);
    margin-top: 4rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    cursor: pointer;
    border: 0;
    background: transparent;
    padding: 0.25rem;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: all 0.3s ease-in-out;
    background-color: var(--text-primary);
}

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

.hamburger.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Responsive */
@media (max-width: 1024px) {
    .hamburger {
        display: block;
        z-index: 1001;
    }

    .nav-menu {
        position: fixed;
        left: 0;
        top: 0;
        transform: translateY(-100%);
        gap: 0.75rem;
        flex-direction: column;
        background-color: rgba(5, 5, 10, 0.95);
        width: 100%;
        height: 100dvh;
        text-align: center;
        transition: 0.3s ease-in-out;
        justify-content: center;
        z-index: 1000;
        opacity: 0;
        pointer-events: none;
        backdrop-filter: blur(12px);
        padding: 96px 24px 24px;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-link {
        font-size: 1.15rem;
        letter-spacing: 0.12em;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: column;
        align-items: flex-start;
        padding-left: 50px;
        padding-top: 0;
    }

    .timeline-content {
        width: 100%;
        margin: 0 !important;
    }

    .timeline-date {
        position: relative !important;
        left: 0 !important;
        right: auto !important;
        top: auto !important;
        transform: none !important;
        margin-bottom: 1rem !important;
        display: inline-block !important;
        max-width: 100% !important;
        text-align: left !important;
    }
}

@media (max-width: 1280px) and (min-width: 1025px) {
    .nav-brand {
        font-size: 1.35rem;
    }

    .nav-menu {
        gap: 0.9rem;
        row-gap: 0.35rem;
    }

    .nav-link {
        font-size: 0.72rem;
        letter-spacing: 0.12em;
    }
}

@media (max-width: 1120px) and (min-width: 1025px) {
    .nav-brand {
        font-size: 1.2rem;
    }

    .nav-menu {
        gap: 0.65rem;
        row-gap: 0.3rem;
    }

    .nav-link {
        font-size: 0.62rem;
        letter-spacing: 0.08em;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: clamp(2.4rem, 9vw, 3rem);
    }

    .stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    /* Adjust Grid for Mobile */
    .projects-grid,
    .skills-grid {
        grid-template-columns: 1fr;
    }

    .card-style {
        padding: 1.5rem;
    }

    /* Publications Card Mobile */
    .publications-card {
        flex-direction: column;
        text-align: center;
    }

    .publications-card>div {
        width: 100%;
    }

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

@media (prefers-reduced-motion: reduce) {
    * {
        scroll-behavior: auto !important;
        transition: none !important;
        animation: none !important;
    }
}