@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400&family=JetBrains+Mono:wght@400;500&display=swap');
@import url("fontawesome-all.min.css");

/* ========================================
   CSS Variables & Design Tokens
   ======================================== */
:root {
    /* Dark palette */
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2035;
    --bg-card: rgba(26, 32, 53, 0.7);
    --bg-card-hover: rgba(30, 41, 69, 0.85);
    --bg-glass: rgba(255, 255, 255, 0.04);
    --bg-glass-hover: rgba(255, 255, 255, 0.08);

    /* Accent colors */
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-tertiary: #a5b4fc;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --accent-warm: #f59e0b;
    --accent-emerald: #10b981;
    --accent-rose: #f43f5e;

    /* Text colors */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --text-muted: #475569;

    /* Borders */
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(99, 102, 241, 0.3);

    /* Spacing */
    --section-padding: 5rem 0;
    --container-max: 900px;
    --sidebar-width: 280px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ========================================
   Reset & Base
   ======================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-secondary);
    line-height: 1.7;
    font-weight: 400;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.is-preload *,
body.is-preload *::before,
body.is-preload *::after {
    animation: none !important;
    transition: none !important;
}

/* ========================================
   Animated Background
   ======================================== */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(129, 140, 248, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(16, 185, 129, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ========================================
   Typography
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Playfair Display', Georgia, serif;
    color: var(--text-primary);
    line-height: 1.3;
    font-weight: 600;
}

h1 {
    font-size: 2.2rem;
}

h2 {
    font-size: 1.85rem;
    letter-spacing: -0.02em;
}

h3 {
    font-size: 1.25rem;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
}

h4 {
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
}

p {
    margin-bottom: 1.2em;
    text-align: justify;
    hyphens: auto;
}

a {
    color: var(--accent-secondary);
    text-decoration: none;
    transition: color var(--transition-fast), border-color var(--transition-fast);
    border-bottom: 1px solid transparent;
}

a:hover {
    color: var(--accent-tertiary);
    border-bottom-color: var(--accent-tertiary);
}

strong,
b {
    font-weight: 600;
    color: var(--text-primary);
}

em,
i {
    font-style: italic;
}

ul,
ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ========================================
   Sidebar Navigation
   ======================================== */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    overflow-y: auto;
}

#header .top {
    flex: 1;
    display: flex;
    flex-direction: column;
}

#logo {
    padding: 2rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-subtle);
}

#logo .image.avatar48 {
    display: inline-block;
    margin-bottom: 1rem;
}

#logo .image.avatar48 img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--accent-primary);
    box-shadow: 0 0 20px var(--accent-glow);
    transition: transform var(--transition-spring), box-shadow var(--transition-smooth);
}

#logo .image.avatar48 img:hover {
    transform: scale(1.08);
    box-shadow: 0 0 30px var(--accent-glow);
}

#logo h1 {
    font-family: 'Playfair Display', serif;
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

#logo p {
    font-size: 0.8rem;
    color: var(--accent-secondary);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 0;
}

/* Navigation */
#nav {
    padding: 1.5rem 0;
    flex: 1;
}

#nav ul {
    list-style: none;
}

#nav ul li a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 1.5rem;
    color: var(--text-tertiary);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    border-bottom: none;
    transition: all var(--transition-fast);
    position: relative;
}

#nav ul li a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 3px;
    background: var(--accent-primary);
    transform: scaleY(0);
    transition: transform var(--transition-fast);
    border-radius: 0 2px 2px 0;
}

#nav ul li a:hover,
#nav ul li a.active {
    color: var(--text-primary);
    background: var(--bg-glass);
}

#nav ul li a:hover::before,
#nav ul li a.active::before {
    transform: scaleY(1);
}

#nav ul li a .icon {
    font-size: 1rem;
    width: 1.2rem;
    text-align: center;
    color: var(--accent-secondary);
}

#nav ul li a i {
    font-size: 1rem;
    width: 1.2rem;
    text-align: center;
    color: var(--accent-secondary);
    flex-shrink: 0;
}

/* ========================================
   Main Content
   ======================================== */
#main {
    margin-left: var(--sidebar-width);
    position: relative;
    z-index: 1;
}

/* ========================================
   Sections
   ======================================== */
section {
    padding: var(--section-padding);
    position: relative;
}

section .container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Section Headers */
.section-header {
    margin-bottom: 3rem;
    position: relative;
}

.section-header h2 {
    display: inline-block;
    position: relative;
    padding-bottom: 0.75rem;
}

.section-header h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 2px;
}

section header {
    margin-bottom: 2.5rem;
}

section header h2 {
    display: inline-block;
    position: relative;
    padding-bottom: 0.75rem;
}

section header h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 2px;
}

/* ========================================
   Hero / About Section
   ======================================== */
#about {
    padding-top: 4rem;
    padding-bottom: 4rem;
    min-height: auto;
}

.hero-content {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
}

.hero-photo {
    flex-shrink: 0;
}

.hero-photo img {
    width: 200px;
    height: 260px;
    object-fit: cover;
    border-radius: 12px;
    border: 2px solid var(--border-subtle);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.hero-photo img:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.hero-text {
    flex: 1;
}

.hero-text .tagline {
    font-size: 0.85rem;
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
    margin-bottom: 0.75rem;
    text-align: left;
}

.hero-text h1 {
    font-size: 2.4rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-tertiary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text .subtitle {
    font-size: 1.05rem;
    color: var(--text-tertiary);
    margin-bottom: 1.5rem;
    text-align: left;
}

.hero-text .bio {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

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

.hero-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    border-bottom: 1px solid var(--border-subtle);
}

.hero-link:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-primary);
    color: var(--accent-secondary);
    transform: translateY(-2px);
    border-bottom-color: var(--accent-primary);
}

.hero-link i {
    font-size: 0.95rem;
}

/* ========================================
   Research Interests
   ======================================== */
#research {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.research-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 1.75rem;
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.research-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.research-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-accent);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.research-card:hover::before {
    opacity: 1;
}

.research-card .card-icon {
    font-size: 1.5rem;
    color: var(--accent-secondary);
    margin-bottom: 1rem;
    display: block;
}

.research-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.research-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

.research-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 1rem;
}

.tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 20px;
    font-size: 0.72rem;
    color: var(--accent-tertiary);
    font-weight: 500;
}

/* ========================================
   News / Timeline
   ======================================== */
#news {
    position: relative;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 5px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary), var(--border-subtle));
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    padding-bottom: 2rem;
    padding-left: 1rem;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 8px;
    width: 12px;
    height: 12px;
    background: var(--bg-primary);
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    z-index: 1;
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.timeline-item:hover::before {
    background: var(--accent-primary);
    box-shadow: 0 0 12px var(--accent-glow);
}

.timeline-item .date {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.4rem;
}

.timeline-item h4 {
    color: var(--text-primary);
    margin-bottom: 0.3rem;
    font-size: 0.95rem;
}

.timeline-item p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ========================================
   Publications
   ======================================== */
.publication-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.publication-item {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    padding: 1.5rem;
    transition: all var(--transition-smooth);
    position: relative;
    backdrop-filter: blur(10px);
}

.publication-item:hover {
    border-color: var(--border-accent);
    background: var(--bg-card-hover);
    transform: translateX(4px);
}

.publication-type {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.75rem;
}

.publication-type.thesis {
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent-warm);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.publication-type.report {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-emerald);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.publication-type.conference {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-secondary);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.publication-item h4 {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    line-height: 1.5;
}

.publication-item .authors {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.publication-item .authors .self {
    color: var(--accent-secondary);
    font-weight: 600;
}

.publication-item .venue {
    font-size: 0.82rem;
    font-style: italic;
    color: var(--text-tertiary);
    margin-bottom: 0.75rem;
}

.publication-links {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.7rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 6px;
    border: 1px solid var(--border-subtle);
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
    border-bottom: 1px solid var(--border-subtle);
}

.pub-link:hover {
    border-color: var(--accent-primary);
    color: var(--accent-secondary);
    background: var(--bg-glass);
    border-bottom-color: var(--accent-primary);
}

/* ========================================
   Education
   ======================================== */
.education-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.education-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    transition: all var(--transition-smooth);
    backdrop-filter: blur(10px);
}

.education-item:hover {
    border-color: var(--border-accent);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.education-item .edu-logo {
    flex-shrink: 0;
}

.education-item .edu-logo img {
    width: 70px;
    height: 56px;
    object-fit: contain;
    border-radius: 6px;
    filter: brightness(0.9);
    transition: filter var(--transition-fast);
}

.education-item:hover .edu-logo img {
    filter: brightness(1);
}

.education-details h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.education-details .institution {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--accent-secondary);
}

.education-details .meta {
    font-size: 0.82rem;
    color: var(--text-tertiary);
    margin-top: 0.2rem;
}

.education-details .thesis-title {
    font-size: 0.85rem;
    font-style: italic;
    color: var(--text-secondary);
    margin-top: 0.4rem;
    padding-left: 0.75rem;
    border-left: 2px solid var(--accent-primary);
}

/* ========================================
   Experience
   ======================================== */
.experience-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.experience-item {
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    transition: all var(--transition-smooth);
    backdrop-filter: blur(10px);
}

.experience-item:hover {
    border-color: var(--border-accent);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}

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

.experience-item h3 {
    font-size: 1rem;
    color: var(--text-primary);
}

.experience-item .exp-date {
    font-size: 0.78rem;
    color: var(--accent-secondary);
    font-weight: 500;
    white-space: nowrap;
}

.experience-item .exp-company {
    font-size: 0.88rem;
    color: var(--accent-secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.experience-item p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ========================================
   Skills / Expertise
   ======================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.skill-category h3 {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.skill-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.skill-tag {
    display: inline-block;
    padding: 0.3rem 0.7rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    border-color: var(--accent-primary);
    color: var(--accent-secondary);
    background: rgba(99, 102, 241, 0.1);
}

/* ========================================
   Projects
   ======================================== */
.project-category {
    margin-bottom: 2.5rem;
}

.project-category:last-child {
    margin-bottom: 0;
}

.project-category>h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-subtle);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    overflow: hidden;
    transition: all var(--transition-smooth);
    backdrop-filter: blur(10px);
}

.project-card:hover {
    border-color: var(--border-accent);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.25);
}

.project-card .project-image {
    width: 100%;
    height: 160px;
    overflow: hidden;
    position: relative;
}

.project-card .project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-smooth);
    filter: brightness(0.85);
}

.project-card:hover .project-image img {
    transform: scale(1.05);
    filter: brightness(1);
}

.project-card .project-info {
    padding: 1.25rem;
}

.project-card .project-info h4 {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.project-card .project-info p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.project-card .project-links {
    display: flex;
    gap: 0.5rem;
}

.project-card .project-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.75rem;
    color: var(--accent-secondary);
    font-weight: 500;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--border-accent);
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.project-card .project-links a:hover {
    background: rgba(99, 102, 241, 0.15);
    border-bottom-color: var(--border-accent);
}

/* ========================================
   Contact Section
   ======================================== */
#contact {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
}

.contact-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: left;
}

.contact-grid {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    transition: all var(--transition-fast);
    flex: 1;
    min-width: 200px;
}

.contact-card:hover {
    border-color: var(--accent-primary);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    border-bottom-color: var(--accent-primary);
}

.contact-card i {
    font-size: 1.2rem;
    color: var(--accent-secondary);
}

.contact-card .contact-info {
    display: flex;
    flex-direction: column;
}

.contact-card .contact-label {
    font-size: 0.72rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.contact-card .contact-value {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* Icons list fallback */
ul.icons {
    display: flex;
    gap: 1rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

ul.icons li a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: all var(--transition-fast);
    border-bottom: 1px solid var(--border-subtle);
}

ul.icons li a:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-primary);
    color: var(--accent-secondary);
    transform: translateY(-2px);
    border-bottom-color: var(--accent-primary);
}

ul.icons li a .label {
    display: none;
}

/* ========================================
   Footer
   ======================================== */
#footer {
    margin-left: var(--sidebar-width);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-primary);
    position: relative;
    z-index: 1;
}

#footer .copyright {
    list-style: none;
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
    font-size: 0.78rem;
    color: var(--text-muted);
}

#footer .copyright li+li::before {
    content: '·';
    margin-right: 1rem;
    color: var(--text-muted);
}

/* ========================================
   Scroll Animations
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Responsive Design
   ======================================== */
@media screen and (max-width: 960px) {
    :root {
        --sidebar-width: 0px;
    }

    #header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        width: 100%;
        height: auto;
        flex-direction: row;
        align-items: center;
        padding: 0.75rem 1rem;
        border-right: none;
        border-bottom: 1px solid var(--border-subtle);
        z-index: 1000;
        backdrop-filter: blur(20px);
        background: rgba(17, 24, 39, 0.95);
    }

    #header .top {
        flex-direction: row;
        align-items: center;
        width: 100%;
    }

    #logo {
        padding: 0;
        border-bottom: none;
        display: flex;
        align-items: center;
        gap: 0.75rem;
        flex-shrink: 0;
    }

    #logo .image.avatar48 {
        margin-bottom: 0;
    }

    #logo .image.avatar48 img {
        width: 36px;
        height: 36px;
        border-width: 2px;
    }

    #logo h1 {
        font-size: 1rem;
        margin-bottom: 0;
    }

    #logo p {
        display: none;
    }

    #nav {
        padding: 0;
        margin-left: auto;
    }

    #nav ul {
        display: flex;
        gap: 0;
        overflow-x: auto;
    }

    #nav ul li a {
        padding: 0.5rem 0.75rem;
        font-size: 0.75rem;
        white-space: nowrap;
    }

    #nav ul li a::before {
        display: none;
    }

    #nav ul li a .icon {
        font-size: 0.85rem;
    }

    #main {
        margin-left: 0;
        padding-top: 60px;
    }

    #footer {
        margin-left: 0;
    }

    .hero-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .hero-text .tagline,
    .hero-text .subtitle {
        text-align: center;
    }

    .hero-text h1 {
        font-size: 1.8rem;
    }

    .hero-links {
        justify-content: center;
    }

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

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

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

    section .container {
        padding: 0 1.25rem;
    }

    section {
        padding: 3rem 0;
    }
}

@media screen and (max-width: 480px) {
    .hero-photo img {
        width: 150px;
        height: 200px;
    }

    .hero-text h1 {
        font-size: 1.5rem;
    }

    .education-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .education-details .thesis-title {
        border-left: none;
        padding-left: 0;
        border-top: 2px solid var(--accent-primary);
        padding-top: 0.4rem;
    }

    .contact-grid {
        flex-direction: column;
    }

    .experience-item .exp-header {
        flex-direction: column;
    }
}

/* ========================================
   Section alternating backgrounds
   ======================================== */
section:nth-child(even) {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    #header {
        display: none;
    }

    #main {
        margin-left: 0;
    }

    body {
        background: #fff;
        color: #333;
    }

    section {
        page-break-inside: avoid;
    }
}