/* ============================================
   Professor Adil Rasheed - Personal Website
   Color Theme: Deep Blues, Slate Grays, White
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Primary Colors - Deep Ocean Blues */
    --color-primary-dark: #0a192f;
    --color-primary: #112240;
    --color-primary-light: #1d3557;
    
    /* Secondary Colors - Slate Grays */
    --color-slate-dark: #495670;
    --color-slate: #8892b0;
    --color-slate-light: #a8b2d1;
    --color-slate-lighter: #ccd6f6;
    
    /* Accent Colors */
    --color-accent: #d4af37;
    --color-accent-hover: #b8941f;
    --color-white: #e6f1ff;
    --color-pure-white: #ffffff;
    
    /* Typography */
    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Sans Pro', 'Segoe UI', sans-serif;
    --font-mono: 'Fira Code', 'Consolas', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.3);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-primary-dark);
    color: var(--color-slate-light);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Respect the chosen color scheme */
html { color-scheme: dark; }
html[data-theme="light"] { color-scheme: light; }

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-slate-lighter);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}
h2 {
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.01em;
}
h3 {
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 600;
    letter-spacing: -0.005em;
}
h4 { font-size: 1.35rem; font-weight: 600; }
h5 { font-size: 1.15rem; font-weight: 500; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-slate-light);
    line-height: 1.8;
    font-size: 1.05rem;
}

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

a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 25, 47, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(212, 175, 55, 0.1);
    transition: var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-lg);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-logo a {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-slate-lighter);
    text-decoration: none;
}

.nav-logo a:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.nav-logo .logo-accent {
    color: var(--color-accent);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    list-style: none;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-slate-light);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
    background: rgba(212, 175, 55, 0.1);
    text-decoration: none;
}

.nav-link svg {
    width: 14px;
    height: 14px;
    transition: var(--transition-fast);
}

.nav-item:hover .nav-link svg {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition-fast);
    list-style: none;
    padding: var(--spacing-sm) 0;
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-slate-light);
    font-size: 0.85rem;
    text-decoration: none;
    transition: var(--transition-fast);
}

.dropdown-item a:hover {
    background: rgba(212, 175, 55, 0.1);
    color: var(--color-accent);
    text-decoration: none;
}

/* Mobile Menu */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-slate-lighter);
    transition: var(--transition-fast);
}

/* Theme Toggle Button */
.theme-toggle {
    margin-left: var(--spacing-md);
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .4rem .7rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(212,175,55,0.25);
    background: transparent;
    color: var(--color-slate-light);
    cursor: pointer;
    font-size: .85rem;
}
.theme-toggle:hover { background: rgba(212,175,55,0.1); color: var(--color-accent); }
.theme-toggle:focus { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.theme-toggle svg { width: 16px; height: 16px; }

/* ============================================
   Light Theme Variables & Overrides
   ============================================ */
:root[data-theme="light"] {
    /* Primary (light surfaces) */
    --color-primary-dark: #ffffff;
    --color-primary: #f8f9fb;
    --color-primary-light: #eef2f7;

    /* Slate (text tones) */
    --color-slate-dark: #1f2937; /* darkest text */
    --color-slate: #374151;      /* headings/subtitles */
    --color-slate-light: #4b5563;/* body text */
    --color-slate-lighter: #111827; /* strongest heading */

    /* Accent remains the same */
    --color-white: #0f172a; /* not used for backgrounds in light */
}

/* Component overrides for light theme */
html[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid rgba(17, 24, 39, 0.08);
}
html[data-theme="light"] .nav-link { color: var(--color-slate); }
html[data-theme="light"] .nav-link:hover,
html[data-theme="light"] .nav-link.active { background: rgba(212,175,55,0.12); color: var(--color-accent); }
html[data-theme="light"] .dropdown-menu { background: #ffffff; border-color: rgba(17,24,39,0.08); }
html[data-theme="light"] .dropdown-item a { color: var(--color-slate); }
html[data-theme="light"] .dropdown-item a:hover { background: rgba(212,175,55,0.12); color: var(--color-accent); }
html[data-theme="light"] .nav-toggle span { background: #111827; }

/* General light text overrides */
html[data-theme="light"] body { background-color: var(--color-primary-dark); color: var(--color-slate-light); }
html[data-theme="light"] h1, html[data-theme="light"] h2, html[data-theme="light"] h3,
html[data-theme="light"] h4, html[data-theme="light"] h5, html[data-theme="light"] h6 { color: var(--color-slate-lighter); }
html[data-theme="light"] a { color: var(--color-accent); }
html[data-theme="light"] a:hover { color: var(--color-accent-hover); }

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        var(--color-primary-dark) 0%,
        var(--color-primary) 50%,
        var(--color-primary-light) 100%
    );
}

.hero-background::after {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 80%, rgba(212, 175, 55, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(212, 175, 55, 0.05) 0%, transparent 40%);
}

.hero-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--color-accent);
    border-radius: 50%;
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0); }
    25% { transform: translateY(-30px) translateX(10px); }
    50% { transform: translateY(-15px) translateX(-10px); }
    75% { transform: translateY(-40px) translateX(5px); }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease-out;
}

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

.hero-greeting {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    display: inline-block;
}

.hero-name {
    font-size: clamp(3rem, 8vw, 6rem);
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-sm);
    line-height: 1.05;
    font-weight: 900;
    letter-spacing: -0.03em;
}

.hero-title {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--color-slate);
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--color-slate-light);
    max-width: 600px;
    margin-bottom: var(--spacing-xl);
    line-height: 1.9;
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
    animation: fadeInRight 0.8s ease-out 0.2s both;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.hero-image-wrapper::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--color-accent), transparent, var(--color-accent));
    border-radius: var(--radius-lg);
    z-index: -1;
}

/* Social links overlay on hero image */
.hero-social {
    position: absolute;
    left: 50%;
    bottom: 12px;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
    padding: 6px;
    background: rgba(10,25,47,0.75);
    border-radius: 999px;
    align-items: center;
    box-shadow: var(--shadow-md);
    z-index: 5;
}

.hero-social .social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 6px 10px;
    color: var(--color-slate-lighter);
    background: transparent;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    text-decoration: none;
    transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.hero-social .social-link svg { width: 18px; height: 18px; flex-shrink: 0; fill: var(--color-accent); }

.hero-social .social-link:hover { background: rgba(212,175,55,0.06); color: var(--color-accent); transform: translateY(-2px); }

/* Make hero image responsive and constrain height on small screens */
.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    max-height: 520px;
}

/* Show compact social icons on small screens */
.hero-social .social-link .social-text { display: none; }

@media (max-width: 900px) {
    .hero-content { grid-template-columns: 1fr; }
    .hero-image { order: -1; margin-bottom: var(--spacing-md); }
    .hero-image img { max-height: 420px; }
    .hero-social {
        position: static;
        transform: none;
        margin: 0.5rem auto 0;
    }
    .hero-social .social-link { padding: 6px; font-size: 0.8rem; }
    .hero-social .social-link .social-text { display: none; }
}

@media (max-width: 420px) {
    .hero-social { gap: 0.25rem; padding: 4px; }
    .hero-social .social-link svg { width: 16px; height: 16px; }
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
    filter: grayscale(20%);
    transition: var(--transition-base);
}

.hero-image:hover img {
    filter: grayscale(0%);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-base);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-primary-dark);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: transparent;
    color: var(--color-accent);
    text-decoration: none;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-secondary:hover {
    background: rgba(212, 175, 55, 0.1);
    text-decoration: none;
    transform: translateY(-2px);
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.85rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

/* ============================================
   Page Header / Banner
   ============================================ */
.page-header {
    position: relative;
    padding: calc(80px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    background: linear-gradient(
        135deg,
        var(--color-primary-dark) 0%,
        var(--color-primary) 100%
    );
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 30% 70%, rgba(212, 175, 55, 0.08) 0%, transparent 50%);
}

.page-header-content {
    position: relative;
    z-index: 1;
}

.page-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-md);
}

.page-subtitle {
    font-size: 1.2rem;
    color: var(--color-slate);
    max-width: 600px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--color-slate);
}

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

.breadcrumb span {
    color: var(--color-slate);
}

.breadcrumb .current {
    color: var(--color-accent);
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-accent);
    display: block;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
}

.section-description {
    max-width: 700px;
    margin: var(--spacing-lg) auto 0;
    color: var(--color-slate);
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-base);
}

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

.card-image {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-content {
    padding: var(--spacing-lg);
}

.card-category {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.card-title {
    font-size: 1.25rem;
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-sm);
}

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    font-size: 0.85rem;
    color: var(--color-slate);
    margin-bottom: var(--spacing-md);
}

.card-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.card-meta-item svg {
    width: 14px;
    height: 14px;
    color: var(--color-accent);
}

.card-description {
    color: var(--color-slate-light);
    font-size: 0.95rem;
}

.card-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid rgba(100, 255, 218, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ============================================
   Grid Layouts
   ============================================ */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ============================================
   Project Cards
   ============================================ */
.project-card {
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-base);
}

.project-card:hover {
    border-color: rgba(212, 175, 55, 0.3);
    box-shadow: var(--shadow-md);
}

.project-card-header {
    padding: var(--spacing-lg);
    cursor: pointer;
}

.project-card-title {
    font-size: 1.1rem;
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.project-card-title svg {
    flex-shrink: 0;
    transition: var(--transition-fast);
    color: var(--color-accent);
}

.project-card.expanded .project-card-title svg {
    transform: rotate(180deg);
}

.project-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.85rem;
    color: var(--color-slate);
}

.project-card-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.project-card.expanded .project-card-body {
    max-height: 500px;
}

.project-card-content {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    border-top: 1px solid rgba(100, 255, 218, 0.1);
}

/* ============================================
   Publication List
   ============================================ */
.publication-section {
    margin-bottom: var(--spacing-xl);
}

.publication-section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid rgba(212, 175, 55, 0.1);
}

.publication-section-title h3 {
    margin-bottom: 0;
}

.publication-count {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    background: rgba(212, 175, 55, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.publication-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.publication-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.05);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.publication-item:hover {
    border-color: rgba(212, 175, 55, 0.2);
}

.publication-number {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 600;
    min-width: 40px;
}

.publication-content {
    flex: 1;
}

.publication-title {
    color: var(--color-slate-lighter);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
}

.publication-authors {
    font-size: 0.85rem;
    color: var(--color-slate);
    margin-bottom: var(--spacing-xs);
}

.publication-venue {
    font-size: 0.85rem;
    color: var(--color-slate);
    font-style: italic;
}

.publication-link {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--color-accent);
    background: rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-sm);
    text-decoration: none;
}

.publication-link:hover {
    background: rgba(212, 175, 55, 0.2);
    text-decoration: none;
}

/* ============================================
   Gallery / Art
   ============================================ */
.gallery-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.gallery-tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-slate);
    background: transparent;
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-fast);
}

.gallery-tab:hover,
.gallery-tab.active {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: rgba(212, 175, 55, 0.1);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.gallery-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-base);
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top,
        rgba(10, 25, 47, 0.9) 0%,
        rgba(10, 25, 47, 0) 60%
    );
    opacity: 0;
    transition: var(--transition-base);
    display: flex;
    align-items: flex-end;
    padding: var(--spacing-md);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-item-title {
    color: var(--color-slate-lighter);
    font-size: 0.95rem;
    font-weight: 500;
}

/* ============================================
   MSc awards gallery (compact tile grid)
   ============================================ */
.msc-awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-sm);
    align-items: start;
}
.msc-award-tile {
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.04);
    border-radius: var(--radius-md);
    overflow: hidden;
    text-align: center;
    padding: 6px;
}
.msc-award-tile img {
    width: 100%;
    height: 192px;
    object-fit: cover;
    display: block;
    border-radius: 6px;
}
.msc-award-tile figcaption {
    margin-top: 6px;
    font-size: 0.85rem;
    color: var(--color-slate);
}

@media (min-width: 900px) {
    .msc-awards-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
}

@media (max-width: 480px) {
    .msc-awards-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
    .msc-award-tile img { height: 144px; }
}

/* numbered MSc thesis list styling */
.msc-thesis-list {
    margin-top: var(--spacing-md);
    color: var(--color-slate);
}
.msc-thesis-list ol {
    list-style: decimal;
    padding-left: 1.35rem;
}
.msc-thesis-list li {
    margin-bottom: 0.5rem;
    line-height: 1.4;
    color: var(--color-slate-light);
    font-size: 0.95rem;
}

/* ============================================
   PhD Student Cards
   ============================================ */
.phd-students-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.phd-student-card {
    background: var(--color-primary);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
}

.phd-student-card:hover {
    border-color: rgba(100, 255, 218, 0.3);
    box-shadow: var(--shadow-lg);
}

.phd-student-header {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.phd-student-photo {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-md);
    object-fit: cover;
    border: 2px solid rgba(100, 255, 218, 0.2);
}

.phd-student-info {
    flex: 1;
}

.phd-student-info .student-name {
    font-size: 1.5rem;
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-sm);
}

.phd-student-info .student-topic {
    color: var(--color-accent);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.phd-student-info .student-year {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    font-size: 0.9rem;
    font-weight: 500;
}

.phd-student-details p {
    margin-bottom: var(--spacing-md);
    color: var(--color-slate-light);
    line-height: 1.7;
}

.phd-student-details p strong {
    color: var(--color-slate-lighter);
}

.student-summary {
    background: rgba(100, 255, 218, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-accent);
}

.phd-highlights {
    margin-top: var(--spacing-lg);
}

.phd-highlights h5 {
    color: var(--color-slate-lighter);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.highlight-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

.highlight-item {
    background: var(--color-primary-light);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-base);
}

.highlight-item:hover {
    border-color: rgba(100, 255, 218, 0.3);
    transform: translateY(-2px);
}

.highlight-item img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    display: block;
}

.highlight-item p {
    padding: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--color-slate-light);
    text-align: center;
    margin: 0;
}

@media (max-width: 768px) {
    .phd-student-header {
        flex-direction: column;
    }
    
    .phd-student-photo {
        width: 100px;
        height: 100px;
    }
    
    .highlight-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }
}

/* Simple PhD Student Format (for ongoing students) */
.phd-students-simple {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.phd-student-simple {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    background: var(--color-primary);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
}

.phd-student-simple:hover {
    border-color: rgba(100, 255, 218, 0.2);
    box-shadow: var(--shadow-md);
}

.phd-student-photo-simple {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-md);
    object-fit: cover;
    border: 2px solid rgba(100, 255, 218, 0.2);
    flex-shrink: 0;
}

.phd-student-content {
    flex: 1;
}

.phd-student-content .student-name {
    font-size: 1.3rem;
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-xs);
}

.phd-student-content .student-topic {
    color: var(--color-accent);
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.phd-student-content .student-year {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.phd-student-content .student-description {
    color: var(--color-slate-light);
    line-height: 1.7;
    margin: 0;
}

@media (max-width: 768px) {
    .phd-student-simple {
        flex-direction: column;
    }
    
    .phd-student-photo-simple {
        width: 80px;
        height: 80px;
    }
}


/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(10, 25, 47, 0.98);
    display: none;
    align-items: center;
    justify-content: center;
}

.lightbox.active {
    display: flex;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.lightbox-image {
    max-width: 100%;
    max-height: 85vh;
    border-radius: var(--radius-md);
}

.lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: var(--color-slate-lighter);
    cursor: pointer;
    padding: var(--spacing-sm);
    transition: var(--transition-fast);
}

.lightbox-close:hover {
    color: var(--color-accent);
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(212, 175, 55, 0.1);
    border: 1px solid var(--color-accent);
    color: var(--color-accent);
    padding: var(--spacing-md);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.lightbox-nav:hover {
    background: var(--color-accent);
    color: var(--color-primary-dark);
}

.lightbox-prev { left: -60px; }
.lightbox-next { right: -60px; }

.lightbox-caption {
    text-align: center;
    margin-top: var(--spacing-md);
    color: var(--color-slate-light);
}

/* ============================================
   Timeline
   ============================================ */
.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(
        to bottom,
        var(--color-accent),
        rgba(212, 175, 55, 0.2)
    );
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-xl);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--spacing-xl) + 4px);
    top: 8px;
    width: 12px;
    height: 12px;
    background: var(--color-primary-dark);
    border: 2px solid var(--color-accent);
    border-radius: 50%;
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.timeline-title {
    font-size: 1.25rem;
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-xs);
}

.timeline-subtitle {
    color: var(--color-slate);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.timeline-content {
    color: var(--color-slate-light);
}

/* ============================================
   Skills / Tags
   ============================================ */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--color-accent);
    background: rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-full);
}

/* ============================================
   Contact Form
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.contact-item:hover {
    border-color: var(--color-accent);
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-accent);
}

.contact-details h4 {
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-xs);
}

.contact-details p {
    color: var(--color-slate);
    font-size: 0.95rem;
    margin-bottom: 0;
}

.contact-form {
    background: var(--color-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(212, 175, 55, 0.1);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.9rem;
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-sm);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-slate-lighter);
    background: var(--color-primary-dark);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-primary);
    border-top: 1px solid rgba(100, 255, 218, 0.1);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand h3 {
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-md);
}

.footer-brand p {
    color: var(--color-slate);
    font-size: 0.95rem;
}

.footer-title {
    font-size: 1rem;
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-slate);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

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

.footer-social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-sm);
    color: var(--color-slate-lighter);
    transition: var(--transition-fast);
}

.social-link:hover {
    background: var(--color-accent);
    color: var(--color-primary-dark);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(100, 255, 218, 0.1);
    font-size: 0.85rem;
    color: var(--color-slate);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-primary-dark);
        flex-direction: column;
        align-items: stretch;
        padding: var(--spacing-lg);
        gap: 0;
        transform: translateX(100%);
        transition: var(--transition-base);
        overflow-y: auto;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-item {
        border-bottom: 1px solid rgba(212, 175, 55, 0.1);
    }
    
    .nav-link {
        padding: var(--spacing-md) 0;
        justify-content: space-between;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        background: transparent;
        max-height: 0;
        overflow: hidden;
        padding: 0;
    }
    
    .nav-item.dropdown-open .dropdown-menu {
        max-height: 500px;
        padding: var(--spacing-sm) 0;
    }
    
    .dropdown-item a {
        padding-left: var(--spacing-lg);
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .lightbox-nav {
        display: none;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.hidden { display: none; }
.visible { display: block; }

.fade-in {
    animation: fadeInUp 0.6s ease-out;
}

/* ============================================
   CV Specific Styles
   ============================================ */
.cv-section {
    margin-bottom: var(--spacing-xl);
}

.cv-section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-accent);
}

.cv-section-title h3 {
    margin-bottom: 0;
    color: var(--color-accent);
}

.cv-item {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-lg);
    border-left: 2px solid rgba(100, 255, 218, 0.2);
}

.cv-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.cv-item-title {
    font-size: 1.1rem;
    color: var(--color-slate-lighter);
    margin-bottom: 0;
}

.cv-item-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
}

.cv-item-subtitle {
    color: var(--color-slate);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

.cv-item-list {
    list-style: none;
    padding: 0;
}

.cv-item-list li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-slate-light);
    font-size: 0.95rem;
}

.cv-item-list li::before {
    content: '○';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* ============================================
   Awards Grid
   ============================================ */
.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.award-card {
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
}

.award-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-3px);
}

.award-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.award-title {
    color: var(--color-slate-lighter);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.award-year {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
}

/* ============================================
   Teaching Cards
   ============================================ */
.course-card {
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
}

.course-card:hover {
    border-color: rgba(212, 175, 55, 0.3);
}

.course-code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.course-name {
    color: var(--color-slate-lighter);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.course-year {
    color: var(--color-slate);
    font-size: 0.9rem;
}

/* ============================================
   Supervision Section
   ============================================ */
.supervision-category {
    margin-bottom: var(--spacing-xl);
}

.supervision-category-title {
    font-size: 1.3rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid rgba(100, 255, 218, 0.2);
}

.student-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(100, 255, 218, 0.05);
}

.student-name {
    color: var(--color-slate-lighter);
    font-weight: 500;
}

.student-topic {
    color: var(--color-slate);
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
}

.student-year {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    white-space: nowrap;
}

/* ============================================
   Vacancies
   ============================================ */
.vacancy-card {
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.vacancy-status {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.vacancy-status.open {
    background: rgba(212, 175, 55, 0.2);
    color: var(--color-accent);
}

.vacancy-status.closed {
    background: rgba(255, 100, 100, 0.2);
    color: #ff6b6b;
}

.vacancy-title {
    font-size: 1.5rem;
    color: var(--color-slate-lighter);
    margin-bottom: var(--spacing-md);
}

.vacancy-details {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.vacancy-detail {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-slate);
    font-size: 0.95rem;
}

.vacancy-detail svg {
    color: var(--color-accent);
}

.vacancy-description {
    color: var(--color-slate-light);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   Research Areas
   ============================================ */
.research-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    margin-bottom: var(--spacing-2xl);
}

.research-intro-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.research-intro-image img {
    width: 100%;
    height: auto;
    display: block;
}

.research-topics {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.research-topic-card {
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
}

.research-topic-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-3px);
}

.research-topic-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.research-topic-title {
    color: var(--color-slate-lighter);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
}

.research-topic-description {
    color: var(--color-slate-light);
    font-size: 0.95rem;
}

/* Project Category Filters */
.category-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.category-filter {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-slate);
    background: transparent;
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-fast);
}

.category-filter:hover,
.category-filter.active {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: rgba(212, 175, 55, 0.1);
}

/* Stats Section */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-primary);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    color: var(--color-slate);
    font-size: 0.95rem;
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .research-intro {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   AI-Themed Enhancements
   ============================================ */

/* Neural network grid background effect */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(212, 175, 55, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(212, 175, 55, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: -1;
    opacity: 0.5;
}

/* Data visualization pattern overlay */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 15% 25%, rgba(212, 175, 55, 0.015) 0%, transparent 25%),
        radial-gradient(circle at 85% 75%, rgba(212, 175, 55, 0.015) 0%, transparent 25%),
        radial-gradient(circle at 50% 50%, rgba(212, 175, 55, 0.01) 0%, transparent 30%);
    pointer-events: none;
    z-index: -1;
    animation: dataVizPulse 20s ease-in-out infinite;
}

@keyframes dataVizPulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

/* Glowing accent effect for headings */
h1, h2 {
    text-shadow: 0 0 40px rgba(212, 175, 55, 0.15);
}

/* Enhanced card hover with glow */
.card:hover,
.project-card:hover,
.research-topic-card:hover,
.award-card:hover {
    box-shadow:
        0 10px 40px rgba(0, 0, 0, 0.3),
        0 0 20px rgba(212, 175, 55, 0.2);
}

/* Animated gradient border for hero image */
.hero-image-wrapper::before {
    background: linear-gradient(
        45deg,
        var(--color-accent),
        rgba(212, 175, 55, 0.5),
        var(--color-primary-light),
        rgba(212, 175, 55, 0.5),
        var(--color-accent)
    );
    background-size: 300% 300%;
    animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* Pulsing glow animation for particles */
.particle {
    animation: float 20s infinite ease-in-out, pulse 3s infinite ease-in-out;
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.5);
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.2); }
}

/* Tech-inspired button effects */
.btn-primary,
.btn-secondary {
    position: relative;
    overflow: hidden;
}

.btn-primary::before,
.btn-secondary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-primary:hover::before,
.btn-secondary:hover::before {
    width: 300px;
    height: 300px;
}

/* Scan line effect for navbar */
.navbar::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--color-accent),
        transparent
    );
    animation: scanLine 4s infinite;
}

@keyframes scanLine {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Digital text effect for section labels */
.section-label,
.hero-greeting {
    position: relative;
    animation: digitalFlicker 0.1s infinite alternate;
}

@keyframes digitalFlicker {
    0%, 90% { opacity: 1; }
    91%, 100% { opacity: 0.95; }
}

/* Enhanced focus states with glow */
.form-input:focus,
.form-textarea:focus {
    box-shadow:
        0 0 0 3px rgba(212, 175, 55, 0.1),
        0 0 20px rgba(212, 175, 55, 0.2);
}

/* Glowing divider lines */
.section-title::after {
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.6);
}

/* Holographic effect on accent elements */
.nav-logo .logo-accent,
.section-label,
.hero-greeting {
    background: linear-gradient(
        135deg,
        var(--color-accent) 0%,
        #f4e8c1 50%,
        var(--color-accent) 100%
    );
    background-size: 200% 200%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: holographic 3s ease infinite;
}

@keyframes holographic {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* Matrix-style code rain effect for page headers */
.page-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(212, 175, 55, 0.03) 2px,
        rgba(212, 175, 55, 0.03) 4px
    );
    animation: matrixRain 20s linear infinite;
    pointer-events: none;
}

@keyframes matrixRain {
    0% { transform: translateY(0); }
    100% { transform: translateY(50px); }
}

/* Futuristic stat numbers */
.stat-number {
    text-shadow:
        0 0 10px rgba(212, 175, 55, 0.5),
        0 0 20px rgba(212, 175, 55, 0.3),
        0 0 30px rgba(212, 175, 55, 0.2);
    animation: statGlow 2s ease-in-out infinite;
}

@keyframes statGlow {
    0%, 100% { text-shadow:
        0 0 10px rgba(212, 175, 55, 0.5),
        0 0 20px rgba(212, 175, 55, 0.3),
        0 0 30px rgba(212, 175, 55, 0.2); }
    50% { text-shadow:
        0 0 15px rgba(212, 175, 55, 0.7),
        0 0 25px rgba(212, 175, 55, 0.5),
        0 0 35px rgba(212, 175, 55, 0.3); }
}

/* Enhanced link hover with underline animation */
a:not(.btn):not(.nav-link):not(.social-link) {
    position: relative;
    text-decoration: none;
    background-image: linear-gradient(var(--color-accent), var(--color-accent));
    background-size: 0% 1px;
    background-repeat: no-repeat;
    background-position: left bottom;
    transition: background-size 0.3s ease;
}

a:not(.btn):not(.nav-link):not(.social-link):hover {
    background-size: 100% 1px;
    text-decoration: none;
}

/* AI circuit board pattern for hero background */
.hero-background::before {
    background:
        linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%),
        radial-gradient(circle at 20% 80%, rgba(212, 175, 55, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(212, 175, 55, 0.08) 0%, transparent 50%);
}

/* Enhance cards with tech border effect */
.card,
.project-card,
.award-card,
.research-topic-card {
    position: relative;
}

.card::before,
.project-card::before,
.award-card::before,
.research-topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: var(--radius-md);
    padding: 1px;
    background: linear-gradient(
        135deg,
        transparent 0%,
        rgba(212, 175, 55, 0.2) 50%,
        transparent 100%
    );
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.card:hover::before,
.project-card:hover::before,
.award-card:hover::before,
.research-topic-card:hover::before {
    opacity: 1;
}

/* Smooth scroll reveal animations */
@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.card,
.project-card,
.award-card,
.research-topic-card,
.publication-item {
    animation: fadeInScale 0.5s ease-out;
}

/* Enhanced navbar with depth */
.navbar {
    box-shadow:
        0 4px 6px rgba(0, 0, 0, 0.1),
        0 0 20px rgba(212, 175, 55, 0.05);
}

/* Better tag styling */
.tag {
    transition: all 0.3s ease;
    cursor: default;
}

.tag:hover {
    background: rgba(212, 175, 55, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(212, 175, 55, 0.2);
}

/* Enhanced gallery items */
.gallery-item {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.gallery-item:hover {
    box-shadow:
        0 8px 24px rgba(0, 0, 0, 0.3),
        0 0 20px rgba(212, 175, 55, 0.15);
}

/* Code/mono font enhancement */
.hero-greeting,
.section-label,
.cv-item-date,
.timeline-date {
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Publication items hover */
.publication-item {
    transition: all 0.3s ease;
}

.publication-item:hover {
    background: rgba(212, 175, 55, 0.03);
    transform: translateX(8px);
}

/* Contact items enhancement */
.contact-item {
    transition: all 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow:
        0 8px 16px rgba(0, 0, 0, 0.2),
        0 0 15px rgba(212, 175, 55, 0.1);
}

/* Social links enhancement */
.social-link {
    transition: all 0.3s ease;
}

.social-link:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 12px rgba(212, 175, 55, 0.3);
}

/* Timeline enhancement */
.timeline-item {
    transition: all 0.3s ease;
}

.timeline-item:hover {
    padding-left: calc(var(--spacing-xl) + 8px);
}

.timeline-item::before {
    transition: all 0.3s ease;
}

.timeline-item:hover::before {
    width: 16px;
    height: 16px;
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.6);
}

/* Nav link smooth transitions */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

/* Breadcrumb enhancement */
.breadcrumb a {
    transition: all 0.2s ease;
}

.breadcrumb a:hover {
    transform: translateX(2px);
}

/* Award card icon pulse */
.award-icon {
    transition: all 0.3s ease;
}

.award-card:hover .award-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 0 20px rgba(212, 175, 55, 0.4);
}

/* Research topic card icon */
.research-topic-icon {
    transition: all 0.3s ease;
}

.research-topic-card:hover .research-topic-icon {
    transform: scale(1.1) rotate(-5deg);
    box-shadow: 0 0 20px rgba(212, 175, 55, 0.4);
}

/* Section title enhancement */
.section-title {
    transition: all 0.3s ease;
}

/* Vacancy status pulse for open positions */
.vacancy-status.open {
    animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(212, 175, 55, 0.4);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(212, 175, 55, 0);
    }
}

/* Course card enhancement */
.course-card {
    transition: all 0.3s ease;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow:
        0 8px 20px rgba(0, 0, 0, 0.2),
        0 0 15px rgba(212, 175, 55, 0.1);
}

/* Footer link animation */
.footer-links a {
    position: relative;
    padding-left: 0;
    transition: all 0.3s ease;
}

.footer-links a::before {
    content: '→';
    position: absolute;
    left: -15px;
    opacity: 0;
    transition: all 0.3s ease;
    color: var(--color-accent);
}

.footer-links a:hover::before {
    left: -20px;
    opacity: 1;
}

.footer-links a:hover {
    padding-left: 8px;
}

/* Hero buttons enhancement */
.hero-buttons .btn {
    transition: all 0.3s ease;
}

.hero-buttons .btn:hover {
    box-shadow: 0 8px 20px rgba(212, 175, 55, 0.3);
}

/* ============================================
   AI/ML Data Visualization Elements
   ============================================ */

/* Neural network nodes on section headers */
.section-header::before {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    box-shadow:
        0 0 10px rgba(212, 175, 55, 0.5),
        0 0 20px rgba(212, 175, 55, 0.3);
    animation: nodeGlow 2s ease-in-out infinite;
}

.section-header {
    position: relative;
}

@keyframes nodeGlow {
    0%, 100% {
        opacity: 0.6;
        transform: translateX(-50%) scale(1);
    }
    50% {
        opacity: 1;
        transform: translateX(-50%) scale(1.2);
    }
}

/* Data point decorations for cards */
.card::after,
.project-card::after,
.research-topic-card::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--color-accent);
    border-radius: 50%;
    top: 12px;
    right: 12px;
    opacity: 0;
    transition: opacity 0.3s ease;
    box-shadow: 0 0 8px rgba(212, 175, 55, 0.6);
}

.card:hover::after,
.project-card:hover::after,
.research-topic-card:hover::after {
    opacity: 0.8;
    animation: dataPointPulse 1.5s ease-in-out infinite;
}

@keyframes dataPointPulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.5); opacity: 1; }
}

/* Neural connection lines for timeline */
.timeline::after {
    content: '';
    position: absolute;
    left: 8px;
    top: 20%;
    width: 2px;
    height: 60%;
    background: linear-gradient(
        to bottom,
        transparent,
        rgba(212, 175, 55, 0.2) 20%,
        rgba(212, 175, 55, 0.2) 80%,
        transparent
    );
    opacity: 0.5;
    animation: connectionFlow 3s ease-in-out infinite;
}

@keyframes connectionFlow {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.7; }
}

/* Data stream effect for hero section */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 100px,
            rgba(212, 175, 55, 0.01) 100px,
            rgba(212, 175, 55, 0.01) 101px
        );
    pointer-events: none;
    opacity: 0.5;
    animation: dataStream 30s linear infinite;
}

@keyframes dataStream {
    0% { transform: translateX(0); }
    100% { transform: translateX(100px); }
}

/* ML Graph visualization on stat items */
.stat-item::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(212, 175, 55, 0.3) 20%,
        rgba(212, 175, 55, 0.6) 50%,
        rgba(212, 175, 55, 0.3) 80%,
        transparent 100%
    );
    opacity: 0;
    transition: opacity 0.3s ease;
}

.stat-item:hover::before {
    opacity: 1;
    animation: graphLine 2s ease-in-out infinite;
}

@keyframes graphLine {
    0%, 100% { height: 3px; }
    50% { height: 6px; }
}

.stat-item {
    position: relative;
    overflow: hidden;
}

/* Binary code pattern for page headers */
.page-header::before {
    background:
        radial-gradient(ellipse at 30% 70%, rgba(212, 175, 55, 0.08) 0%, transparent 50%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 20px,
            rgba(212, 175, 55, 0.015) 20px,
            rgba(212, 175, 55, 0.015) 21px
        );
}

/* AI chip circuit pattern for awards and research cards */
.award-card::after,
.research-topic-card::after {
    content: '';
    position: absolute;
    bottom: 8px;
    left: 8px;
    width: 30px;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(212, 175, 55, 0.3),
        transparent
    );
    opacity: 0;
    transition: opacity 0.3s ease;
}

.award-card:hover::after,
.research-topic-card:hover::after {
    opacity: 1;
    animation: circuitFlow 2s linear infinite;
}

@keyframes circuitFlow {
    0% { transform: translateX(0); }
    100% { transform: translateX(20px); }
}

/* Floating data particles in hero */
.hero-content::before {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    background: radial-gradient(
        circle,
        rgba(212, 175, 55, 0.05) 0%,
        rgba(212, 175, 55, 0.02) 40%,
        transparent 70%
    );
    border-radius: 50%;
    top: 10%;
    right: -5%;
    animation: floatParticle 15s ease-in-out infinite;
    pointer-events: none;
    z-index: -1;
}

.hero-content::after {
    content: '';
    position: absolute;
    width: 150px;
    height: 150px;
    background: radial-gradient(
        circle,
        rgba(212, 175, 55, 0.04) 0%,
        rgba(212, 175, 55, 0.01) 40%,
        transparent 70%
    );
    border-radius: 50%;
    bottom: 15%;
    left: -3%;
    animation: floatParticle 20s ease-in-out infinite reverse;
    pointer-events: none;
    z-index: -1;
}

@keyframes floatParticle {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.5;
    }
    25% {
        transform: translate(20px, -20px) scale(1.1);
        opacity: 0.7;
    }
    50% {
        transform: translate(10px, -40px) scale(1.05);
        opacity: 0.6;
    }
    75% {
        transform: translate(-10px, -20px) scale(1.15);
        opacity: 0.8;
    }
}

.hero-content {
    position: relative;
}

/* Print Styles */
@media print {
    .navbar,
    .footer,
    .btn {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    body::before,
    body::after {
        display: none;
    }

    .page-header {
        background: none;
        padding-top: 0;
    }

    /* Disable animations in print */
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}