/* --- CSS Variables --- */
:root {
    --bg-dark: #0a0b10;
    --bg-light: #12141f;
    --text-main: #f0f0f5;
    --text-muted: #a0a5ba;

    --accent-blue: #00e5ff;
    --accent-purple: #b533ff;
    --accent-glow: rgba(0, 229, 255, 0.4);

    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-strong: rgba(255, 255, 255, 0.15);
    --logo-border: rgba(255, 255, 255, 0.18);
    --panel-shadow: rgba(0, 0, 0, 0.3);
    --panel-glow: rgba(0, 229, 255, 0.1);
    --nav-scrolled-bg: rgba(10, 11, 16, 0.8);
    --nav-mobile-bg: rgba(10, 11, 16, 0.95);
    --page-background:
        radial-gradient(circle at top left, rgba(0, 229, 255, 0.08), transparent 32%),
        radial-gradient(circle at top right, rgba(181, 51, 255, 0.08), transparent 28%),
        linear-gradient(180deg, #0a0b10 0%, #12141f 100%);
    --heading-solid: #ffffff;
    --hero-gradient-start: #ffffff;
    --hero-gradient-end: #a0a5ba;
    --tag-bg: rgba(255, 255, 255, 0.05);
    --tag-border: rgba(255, 255, 255, 0.1);
    --tag-hover-bg: rgba(0, 229, 255, 0.1);
    --tag-hover-border: rgba(0, 229, 255, 0.3);
    --tag-hover-text: #ffffff;
    --tag-cloud-bg: rgba(181, 51, 255, 0.05);
    --tag-cloud-border: rgba(181, 51, 255, 0.2);
    --tag-cloud-hover-bg: rgba(181, 51, 255, 0.15);
    --tag-cloud-hover-border: rgba(181, 51, 255, 0.4);
    --timeline-chip-bg: rgba(181, 51, 255, 0.1);
    --type-chip-bg: rgba(0, 229, 255, 0.1);
    --canvas-particle: rgba(0, 229, 255, 0.5);
    --canvas-line-rgb: 181, 51, 255;

    --font-sans: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

body[data-theme='light'] {
    --bg-dark: #cfd9e4;
    --bg-light: #bdcad8;
    --text-main: #101828;
    --text-muted: #526076;
    --accent-blue: #4ab6f2;
    --accent-purple: #9e72f2;
    --accent-glow: rgba(74, 182, 242, 0.28);
    --glass-bg: rgba(255, 255, 255, 0.46);
    --glass-border: rgba(16, 24, 40, 0.08);
    --glass-border-strong: rgba(16, 24, 40, 0.14);
    --logo-border: rgba(16, 24, 40, 0.18);
    --panel-shadow: rgba(15, 23, 42, 0.08);
    --panel-glow: rgba(74, 182, 242, 0.16);
    --nav-scrolled-bg: rgba(207, 217, 228, 0.84);
    --nav-mobile-bg: rgba(207, 217, 228, 0.94);
    --page-background:
        radial-gradient(circle at 15% 20%, rgba(229, 236, 244, 0.8), transparent 28%),
        radial-gradient(circle at 85% 10%, rgba(185, 199, 216, 0.82), transparent 24%),
        radial-gradient(circle at 70% 65%, rgba(216, 226, 236, 0.58), transparent 30%),
        linear-gradient(135deg, #d8e2ec 0%, #cdd8e3 34%, #c2cedb 67%, #d3dde8 100%);
    --heading-solid: #101828;
    --hero-gradient-start: #101828;
    --hero-gradient-end: #526076;
    --tag-bg: rgba(255, 255, 255, 0.9);
    --tag-border: rgba(16, 24, 40, 0.08);
    --tag-hover-bg: rgba(74, 182, 242, 0.22);
    --tag-hover-border: rgba(74, 182, 242, 0.38);
    --tag-hover-text: #101828;
    --tag-cloud-bg: rgba(158, 114, 242, 0.14);
    --tag-cloud-border: rgba(158, 114, 242, 0.28);
    --tag-cloud-hover-bg: rgba(158, 114, 242, 0.22);
    --tag-cloud-hover-border: rgba(158, 114, 242, 0.38);
    --timeline-chip-bg: rgba(158, 114, 242, 0.18);
    --type-chip-bg: rgba(74, 182, 242, 0.18);
    --canvas-particle: rgba(74, 182, 242, 0.32);
    --canvas-line-rgb: 158, 114, 242;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-dark);
    background-image: var(--page-background);
    background-attachment: fixed;
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Canvas Background */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none; /* Let clicks pass through */
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-weight: 600;
    color: var(--heading-solid);
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-purple);
}

/* --- Navigation --- */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    transition: background var(--transition-normal), backdrop-filter var(--transition-normal);
}

nav.scrolled {
    background: var(--nav-scrolled-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.logo img {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center;
    border: 2px solid var(--logo-border);
}

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

.nav-links a {
    color: var(--text-main);
    font-size: 1rem;
    position: relative;
    padding-bottom: 5px;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    transition: width var(--transition-fast);
}

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

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-main);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-main);
    border-radius: 999px;
    width: 44px;
    height: 44px;
    padding: 0;
    cursor: pointer;
    backdrop-filter: blur(10px);
    transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.theme-toggle:hover {
    transform: translateY(-2px);
    border-color: var(--accent-blue);
}

.theme-toggle i {
    color: var(--accent-blue);
    font-size: 1rem;
}

/* --- Layout Containers --- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 6rem 2rem 4rem;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    border-radius: 2px;
}

.subsection-title {
    font-size: 1.8rem;
    margin: 3rem 0 1.5rem;
}

/* --- Glassmorphism Panel --- */
.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    backdrop-filter: blur(18px);
    padding: 2rem;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border var(--transition-normal);
}

.glass-panel:hover {
    transform: translateY(-5px);
    border-color: var(--glass-border-strong);
    box-shadow: 0 10px 30px var(--panel-shadow), 0 0 20px var(--panel-glow);
}

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

.hero-content {
    max-width: 800px;
    z-index: 10;
}

.hero-intro {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.hero-profile {
    width: 108px;
    height: 108px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center;
    flex-shrink: 0;
    border: 3px solid var(--accent-blue);
}

.hero-heading {
    min-width: 0;
}

.greeting {
    font-family: var(--font-mono);
    color: var(--accent-blue);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 5.5rem);
    line-height: 1.1;
    margin-bottom: 1rem;
    color: var(--heading-solid);
    background: linear-gradient(to right, var(--hero-gradient-start), var(--hero-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-weight: 400;
}

.hero h2 span {
    color: var(--accent-purple);
}

.summary {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    text-align: center;
}

.summary p {
    margin: 0;
}

.summary-list {
    margin: 0.75rem 0 0;
    padding-left: 0;
    list-style: none;
    color: inherit;
    display: inline-block;
    text-align: left;
}

.summary-list li {
    position: relative;
    padding-left: 2.5em;
}

.summary-list li + li {
    margin-top: 0.35rem;
}

.summary-list li::before {
    position: absolute;
    left: 0;
    top: 0;
    content: "\2022";
    color: inherit;
}

.social-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.social-links a {
    font-size: 1.5rem;
    color: var(--text-main);
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.social-links .fa-orcid {
    color: inherit;
}

.social-links a:hover {
    color: var(--accent-blue);
    transform: translateY(-3px);
}

.social-links a:hover .fa-orcid {
    color: #BACE59;
}

.location {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--glass-border);
}

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

.timeline-dot {
    position: absolute;
    left: -2.4rem;
    top: 1.5rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-dark);
    border: 3px solid var(--accent-blue);
    box-shadow: 0 0 10px var(--accent-glow);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.timeline-header h3 {
    font-size: 1.3rem;
    color: var(--heading-solid);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-purple);
    background: var(--timeline-chip-bg);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    white-space: nowrap;
}

.institute {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.experience-subheader {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.experience-subheader .institute {
    margin-bottom: 0;
}

.experience-location {
    color: var(--accent-purple);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin: 0;
    white-space: nowrap;
}

.duties {
    list-style: none;
}

.duties li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.duties li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
}

.duties strong {
    color: var(--text-main);
}

.duties .project-item .project-text {
    font-style: italic;
}

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

.card {
    position: relative;
    overflow: hidden;
}

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

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.card h4 {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.card .date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-purple);
    margin-bottom: 0.5rem;
}

.outline-card .date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-purple);
}

.card .grade {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--accent-blue);
    margin-bottom: 1rem;
}

.card .thesis {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.card .thesis strong {
    color: var(--text-main);
}

.card .thesis .thesis-text {
    font-style: italic;
}

.outline-card {
    padding: 1.5rem;
}
.outline-card h4 {
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.outline-card .timeline-header {
    margin-bottom: 0.75rem;
}

.outline-card .participation-subheader {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.outline-card .participation-type {
    color: var(--accent-blue);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background: var(--type-chip-bg);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
}

.outline-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.outline-card .role {
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin: 0;
}

.outline-card .location {
    color: var(--accent-purple);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin: 0;
}

.outline-card .title {
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.outline-card .organizer {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.outline-card .conference-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.outline-card .conference-link::before {
    content: '\f0c1';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
}

.outline-card .conference-link:hover {
    color: var(--accent-blue);
}
.outline-card span {
    color: var(--accent-purple);
}

.outline-card .timeline-date {
    display: inline-block;
    margin-top: 0;
}

.participations-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* --- Publications List --- */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.pub-item {
    position: relative;
    padding-top: 4.4rem;
}

.pub-item .timeline-date {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    white-space: nowrap;
}

.pub-item .authors {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.pub-item .pub-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.pub-item .venue {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.doi-link {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.doi-link::before {
    content: '\f0c1';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
}

/* --- Skills --- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.skill-category h3 {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.8rem;
}

.skill-category h3 i {
    color: var(--accent-blue);
}

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

.tags span {
    background: var(--tag-bg);
    border: 1px solid var(--tag-border);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-size: 0.9rem;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.tags span:hover {
    background: var(--tag-hover-bg);
    border-color: var(--tag-hover-border);
    transform: translateY(-2px);
    color: var(--tag-hover-text);
}

.tags span.cloud {
    background: var(--tag-cloud-bg);
    border-color: var(--tag-cloud-border);
}

.tags span.cloud:hover {
    background: var(--tag-cloud-hover-bg);
    border-color: var(--tag-cloud-hover-border);
}

/* --- Footer --- */
footer {
    border-top: 1px solid var(--glass-border);
    padding: 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-family: var(--font-mono);
}

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

.social-links-footer a {
    color: var(--text-muted);
    font-size: 1.2rem;
}

.social-links-footer a:hover {
    color: var(--accent-blue);
}

/* --- Animations & Utilities --- */
.appear {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* --- Media Queries --- */
@media screen and (max-width: 768px) {
    .nav-links {
        display: none; /* Can add proper mobile menu JS if needed */
    }

    .hamburger {
        display: block;
    }

    .theme-toggle {
        width: 42px;
        height: 42px;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .hero-intro {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .location {
        margin-left: 0;
        width: 100%;
        margin-top: 1rem;
    }
    
    .timeline::before {
        left: 0.5rem;
    }
    
    .timeline-dot {
        left: -1.9rem;
    }
    
    .timeline-header {
        flex-direction: column;
        gap: 0.5rem;
    }

    .experience-subheader {
        flex-direction: column;
        gap: 0.35rem;
    }

    .outline-card .participation-subheader {
        display: contents;
    }

    .outline-card .timeline-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .participations-list .outline-card {
        display: flex;
        flex-direction: column;
    }

    .outline-card .location {
        order: 4;
        width: 100%;
        margin-top: 0.75rem;
    }

    .outline-card .role {
        order: 1;
    }

    .outline-card .title {
        order: 2;
    }

    .outline-card .organizer {
        order: 3;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}