/* 
   ==========================================================================
   Prof. Karel Berka Homepage - Premium Design System (Vanilla CSS)
   ========================================================================== 
*/

/* --- Google Font Import and Base Reset --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

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

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

/* --- Theme Variables --- */
:root {
    /* Font Families */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Theme Colors (Light Theme Defaults) */
    --hue-primary: 195; /* Cyan */
    --hue-secondary: 245; /* Indigo */
    
    --bg-base: #f8fafc;
    --bg-surface: rgba(255, 255, 255, 0.85);
    --bg-surface-alt: #f1f5f9;
    --border-color: rgba(226, 232, 240, 0.8);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --color-primary: hsl(var(--hue-primary), 90%, 35%);
    --color-primary-light: hsl(var(--hue-primary), 80%, 93%);
    --color-secondary: hsl(var(--hue-secondary), 75%, 45%);
    --color-accent: #0f766e; /* Teal */
    
    --gradient-hero: linear-gradient(135deg, hsl(var(--hue-primary), 85%, 95%) 0%, hsl(var(--hue-secondary), 70%, 93%) 100%);
    --gradient-accent: linear-gradient(90deg, hsl(var(--hue-primary), 80%, 40%) 0%, hsl(var(--hue-secondary), 70%, 50%) 100%);
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);
    --glass-blur: 12px;
    --card-radius: 16px;
    
    --canvas-opacity: 0.15;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Overrides */
body.dark-theme {
    --bg-base: #090d16;
    --bg-surface: rgba(15, 23, 42, 0.7);
    --bg-surface-alt: rgba(30, 41, 59, 0.6);
    --border-color: rgba(51, 65, 85, 0.4);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --color-primary: hsl(var(--hue-primary), 90%, 50%);
    --color-primary-light: hsl(var(--hue-primary), 90%, 15%);
    --color-secondary: hsl(var(--hue-secondary), 85%, 65%);
    --color-accent: #2dd4bf;
    
    --gradient-hero: linear-gradient(135deg, #090d16 0%, #030712 100%);
    --gradient-accent: linear-gradient(90deg, hsl(var(--hue-primary), 90%, 50%) 0%, hsl(var(--hue-secondary), 80%, 65%) 100%);
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
    
    --canvas-opacity: 0.35;
}

/* --- Layout & Base Styles --- */
body {
    font-family: var(--font-body);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Canvas background */
#molecular-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: auto; /* Allow mouse interaction */
    opacity: var(--canvas-opacity);
    transition: opacity var(--transition-normal);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    position: relative;
    padding: 100px 0;
}

.section.alt-bg {
    background-color: var(--bg-surface-alt);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

img {
    max-width: 100%;
    display: block;
}

/* --- Typography System --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-primary);
}

h1 {
    font-size: 3rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.25rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

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

/* --- Navigation Header --- */
#site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: var(--bg-surface);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-normal), border-color var(--transition-normal), transform var(--transition-normal);
}

#site-header.scroll-down {
    transform: translateY(-100%);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.35rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.logo-caricature-img {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-primary);
    background-color: #ffffff;
    transition: transform var(--transition-fast);
}

.logo:hover .logo-caricature-img {
    transform: scale(1.1) rotate(5deg);
}

.logo-text {
    margin-left: 12px;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#nav-menu ul {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-link {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: width var(--transition-normal);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

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

.nav-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

#theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

#theme-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

/* Toggle icon display */
body.dark-theme .moon-icon { display: none; }
body:not(.dark-theme) .sun-icon { display: none; }

#mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 101;
}

#mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
}

/* --- Hero Section --- */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 140px;
    padding-bottom: 60px;
    background: var(--gradient-hero);
    transition: background var(--transition-normal);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.hero-content {
    max-width: 650px;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 30px;
    margin-bottom: 20px;
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.footer-signature-wrapper {
    margin-bottom: 16px;
    padding: 8px 16px;
    background-color: #ffffff;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: inline-block;
    max-width: 100%;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

body.dark-theme .footer-signature-wrapper {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.08);
}

.footer-signature-img {
    max-height: 32px;
    width: auto;
    display: block;
}

.footer-signature-wrapper:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hero-description {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 36px;
    color: var(--text-secondary);
}

.hero-actions {
    display: flex;
    gap: 16px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-accent);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 14px rgba(6, 182, 212, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.6);
}

.btn-secondary {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary-light);
    transform: translateY(-1px);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

/* Avatar Image */
.hero-image-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.avatar-holder {
    position: relative;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    padding: 8px;
    background: var(--gradient-accent);
    box-shadow: var(--shadow-lg);
}

.profile-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    border: 6px solid var(--bg-base);
    background-color: var(--bg-surface-alt);
    position: relative;
    z-index: 2;
}

.avatar-backdrop {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    background: var(--gradient-accent);
    border-radius: 50%;
    z-index: 1;
    opacity: 0.3;
    filter: blur(15px);
    animation: rotateGradient 12s linear infinite;
}

@keyframes rotateGradient {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.hero-scroll-indicator a {
    color: var(--text-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
}

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

/* --- Section Headers --- */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.divider {
    width: 60px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
    margin: 16px auto 0;
}

/* Grid helper */
.grid {
    display: grid;
    gap: 30px;
}

.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.tools-grid { display: grid; gap: 30px; grid-template-columns: repeat(4, 1fr); }

/* --- About section adjustments --- */
.about-text {
    display: flow-root;
}

.about-text h3 {
    margin-bottom: 16px;
    font-size: 1.75rem;
}

.about-caricature-wrapper {
    float: right;
    width: 140px;
    margin: 0 0 20px 20px;
    padding: 6px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.about-caricature {
    width: 100%;
    height: auto;
    border-radius: 10px;
    display: block;
    background-color: #ffffff;
}

.caricature-caption {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 6px;
    line-height: 1.2;
    font-weight: 500;
}

@media (max-width: 640px) {
    .about-caricature-wrapper {
        float: none;
        width: 160px;
        margin: 0 auto 20px;
    }
}

.about-text p {
    font-size: 1.05rem;
    margin-bottom: 20px;
    line-height: 1.7;
}

.inline-link {
    color: var(--color-primary);
    font-weight: 500;
    border-bottom: 1px dashed var(--color-primary);
    padding-bottom: 1px;
}

.inline-link:hover {
    color: var(--color-secondary);
    border-bottom-style: solid;
}

.about-cards {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.aff-card {
    display: flex;
    gap: 20px;
    padding: 24px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.aff-card:hover {
    transform: translateX(6px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-info h4 {
    font-size: 1.15rem;
    margin-bottom: 4px;
}

.card-info p {
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.card-link {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
}

.card-link:hover {
    color: var(--color-secondary);
}

.profiles-list {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-primary);
}

.profiles-list a:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

.profiles-list span {
    color: var(--text-muted);
}

/* --- ChemData Lab styles --- */
.chemdata-main-card {
    padding: 40px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    box-shadow: var(--shadow-md);
}

.chemdata-text h3 {
    font-size: 1.6rem;
    margin-bottom: 16px;
}

.research-focus-list {
    list-style: none;
    margin-top: 24px;
}

.research-focus-list li {
    position: relative;
    padding-left: 28px;
    margin-bottom: 16px;
    font-size: 1rem;
    color: var(--text-secondary);
}

.research-focus-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--gradient-accent);
}

.chemdata-stats-graphics {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
    padding-left: 20px;
}

/* Orbit Animation */
.lab-graphic-box {
    width: 100%;
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.orbit-container {
    position: relative;
    width: 180px;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px dashed var(--border-color);
    border-radius: 50%;
}

.orbit-center {
    width: 90px;
    height: 90px;
    background: var(--bg-base);
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    z-index: 10;
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
}

.orbit-planet {
    position: absolute;
    width: 48px;
    height: 48px;
    background: var(--gradient-accent);
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-family: var(--font-heading);
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

.orbit-planet.p1 {
    animation: orbit1 10s linear infinite;
}

.orbit-planet.p2 {
    animation: orbit2 10s linear infinite;
}

.orbit-planet.p3 {
    animation: orbit3 10s linear infinite;
}

@keyframes orbit1 {
    0% { transform: rotate(0deg) translate(90px) rotate(0deg); }
    100% { transform: rotate(360deg) translate(90px) rotate(-360deg); }
}

@keyframes orbit2 {
    0% { transform: rotate(120deg) translate(90px) rotate(-120deg); }
    100% { transform: rotate(480deg) translate(90px) rotate(-480deg); }
}

@keyframes orbit3 {
    0% { transform: rotate(240deg) translate(90px) rotate(-240deg); }
    100% { transform: rotate(60deg) translate(90px) rotate(-60deg); }
}

.lab-opportunities {
    text-align: center;
    background-color: var(--bg-surface-alt);
    padding: 24px;
    border-radius: var(--card-radius);
    width: 100%;
}

.lab-opportunities h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.lab-opportunities p {
    font-size: 0.9rem;
    margin-bottom: 16px;
}

/* --- Tools & Services Grid --- */
.tool-card {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 36px 30px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    overflow: hidden;
}

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

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: transparent;
    transition: background var(--transition-fast);
}

.tool-card:hover::before {
    background: var(--gradient-accent);
}

.tool-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--gradient-accent);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 20px;
    font-family: var(--font-heading);
}

.tool-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.tool-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
}

.tool-icon.bg-cyan { background: linear-gradient(135deg, #06b6d4, #0891b2); }
.tool-icon.bg-indigo { background: linear-gradient(135deg, #6366f1, #4f46e5); }
.tool-icon.bg-teal { background: linear-gradient(135deg, #14b8a6, #0d9488); }
.tool-icon.bg-purple { background: linear-gradient(135deg, #a855f7, #7c3aed); }

.tool-header h3 {
    font-size: 1.35rem;
    font-weight: 700;
}

.tool-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
    flex-grow: 1;
}

.tool-meta {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.meta-tag {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 10px;
    background-color: var(--bg-surface-alt);
    border-radius: 4px;
    color: var(--text-secondary);
}

.tool-links {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-tool-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 6px;
    flex-grow: 1;
    transition: all var(--transition-fast);
}

.btn-tool-link.primary {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border: 1px solid rgba(6, 182, 212, 0.1);
}

.btn-tool-link.primary:hover {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-tool-icon {
    width: 42px;
    height: 42px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.btn-tool-icon:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
    background-color: var(--bg-surface-alt);
}

/* Repositories callout */
.repositories-box {
    margin-top: 60px;
}

.repo-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
    padding: 30px 40px;
    background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-surface-alt) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
}

.repo-banner-text h3 {
    margin-bottom: 6px;
}

.repo-banner-text p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* --- Publications section components --- */
.pub-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    gap: 8px;
    background-color: var(--bg-surface);
    padding: 6px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.filter-btn {
    padding: 8px 16px;
    background: transparent;
    border: none;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    color: var(--text-primary);
}

.filter-btn.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.search-box {
    position: relative;
    min-width: 280px;
}

.search-box input {
    width: 100%;
    padding: 10px 16px 10px 40px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

.search-box svg {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    list-style: none;
    padding-left: 0;
    counter-reset: pub-counter;
}

.pub-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
    padding: 24px;
    padding-left: 56px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all var(--transition-normal);
    animation: fadeIn 0.4s ease-out;
    position: relative;
    counter-increment: pub-counter;
}

.pub-card::before {
    content: counter(pub-counter) ".";
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-heading);
}

.pub-card:hover {
    transform: translateX(4px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.pub-thumbnail {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    position: relative;
    z-index: 1;
}

.pub-thumbnail:hover {
    transform: scale(2.5);
    z-index: 100;
    box-shadow: var(--shadow-lg);
}

.pub-topics {
    margin-top: 12px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.topic-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-secondary);
    background-color: var(--bg-surface-alt);
    padding: 4px 10px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.pub-type {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-primary);
    background-color: var(--color-primary-light);
    padding: 4px 8px;
    border-radius: 4px;
    letter-spacing: 0.05em;
    flex-shrink: 0;
    align-self: flex-start;
}

.pub-body {
    flex-grow: 1;
}

.pub-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 6px;
    line-height: 1.4;
}

.pub-authors {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.pub-journal {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

.pub-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-shrink: 0;
}

.btn-pub {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    background-color: var(--bg-surface-alt);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.btn-pub:hover {
    background-color: var(--text-primary);
    color: var(--bg-base);
    border-color: var(--text-primary);
}

.btn-pub-copy {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    background-color: transparent;
    border: 1px dashed var(--border-color);
    color: var(--text-secondary);
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-pub-copy:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pub-footer {
    margin-top: 48px;
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.pub-footer p {
    font-size: 1rem;
    margin-bottom: 20px;
}

.academic-badges {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.badge-link {
    display: inline-flex;
    align-items: center;
    padding: 10px 24px;
    border-radius: 30px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    background-color: var(--bg-surface);
}

.badge-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.border-orcid {
    border: 1px solid #a6cf00;
    color: #a6cf00;
}
.border-orcid:hover {
    background-color: #a6cf00;
    color: #ffffff;
}

.badge-circle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    font-size: 0.7rem;
    font-weight: 800;
    margin-right: 8px;
    color: #ffffff;
}

.orcid-bg { background-color: #a6cf00; }

.border-scholar {
    border: 1px solid #4285f4;
    color: #4285f4;
}
.border-scholar:hover {
    background-color: #4285f4;
    color: #ffffff;
}

/* --- Contact & Map components --- */
.contact-info-block h3, .contact-form-block h3 {
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.office-lead {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.office-sub {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.address-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 30px;
}

.address-item {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.address-item svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

.map-placeholder {
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    background-color: var(--bg-surface-alt);
}

.map-placeholder iframe {
    display: block;
}

/* Contact Form */
.contact-form-block {
    padding: 40px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

.form-feedback {
    margin-top: 16px;
    font-size: 0.95rem;
    font-weight: 500;
    text-align: center;
    display: none;
}

.form-feedback.success {
    color: #10b981;
    display: block;
}

.form-feedback.error {
    color: #ef4444;
    display: block;
}

/* --- Collaborators Section --- */
.collab-card {
    display: flex;
    flex-direction: column;
    padding: 30px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.collab-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.collab-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-accent);
    color: #ffffff;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.collab-info h4 {
    font-size: 1.15rem;
    margin-bottom: 4px;
}

.collab-inst {
    font-size: 0.9rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 12px;
}

.collab-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 16px;
}

.collab-info {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.collab-papers {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px dashed var(--border-color);
}

.collab-papers-title {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.collab-papers-list {
    list-style: none;
    padding-left: 0;
}

.collab-papers-list li {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 8px;
    position: relative;
    padding-left: 12px;
}

.collab-papers-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.collab-papers-list li:last-child {
    margin-bottom: 0;
}

/* --- Footer --- */
footer {
    padding: 48px 0;
    background-color: var(--bg-surface-alt);
    border-top: 1px solid var(--border-color);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
}

.footer-left p {
    margin-bottom: 4px;
    font-size: 0.95rem;
}

.footer-left p.footer-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-right .social-links {
    display: flex;
    gap: 16px;
}

.footer-right .social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.footer-right .social-links a:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

/* --- Responsive Adjustments --- */
@media (max-width: 1024px) {
    h1 { font-size: 2.75rem; }
    .hero-title { font-size: 3rem; }
    .grid-3 { grid-template-columns: 1fr 1fr; }
    .tools-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    html { font-size: 15px; }
    
    section { padding: 70px 0; }
    
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .tools-grid { grid-template-columns: 1fr; }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 36px;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-actions {
        width: 100%;
        flex-direction: column;
        gap: 12px;
    }
    
    .hero-image-wrapper {
        order: -1; /* Place image on top on mobile */
    }
    
    .avatar-holder {
        width: 240px;
        height: 240px;
    }
    
    .repo-banner {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }
    
    .repo-banner a {
        width: 100%;
    }
    
    /* Navigation burger */
    #mobile-menu-toggle {
        display: flex;
    }
    
    #nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--bg-surface);
        backdrop-filter: blur(var(--glass-blur));
        -webkit-backdrop-filter: blur(var(--glass-blur));
        border-bottom: 1px solid var(--border-color);
        padding: 40px;
        transform: translateY(-150%);
        transition: transform var(--transition-normal);
        z-index: 99;
        max-height: calc(100vh - 80px);
        overflow-y: auto;
    }
    
    #nav-menu.open {
        transform: translateY(0);
    }
    
    #nav-menu ul {
        flex-direction: column;
        align-items: center;
        gap: 24px;
    }
    
    /* Hamburger icon state */
    #mobile-menu-toggle.open span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    #mobile-menu-toggle.open span:nth-child(2) {
        opacity: 0;
    }
    #mobile-menu-toggle.open span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .pub-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        overflow-x: auto;
        white-space: nowrap;
    }
    
    .pub-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .pub-links {
        flex-direction: row;
        width: 100%;
    }
    
    .pub-links a, .pub-links button {
        flex-grow: 1;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .chemdata-main-card {
        padding: 24px 16px;
    }
    .tool-card {
        padding: 24px 16px;
    }
    .contact-form-block {
        padding: 24px 16px;
    }
    .hero-title { font-size: 2.5rem; }
    .hero-subtitle {
        font-size: 1.25rem;
    }
}

/* ==========================================================================
   ChemData Lab Section & Announcements
   ========================================================================== */
.chemdata-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chemdata-info .custom-list {
    margin-top: 1rem;
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.chemdata-announcements {
    background-color: var(--bg-surface);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.announcement-header {
    margin-bottom: 1rem;
}

.announcement-header .badge {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.announcement-header .subsection-title {
    margin-top: 0.5rem;
}

.opportunities-list {
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.opportunities-list li {
    position: relative;
    padding-left: 5px;
}

.chemdata-announcements p {
    margin-bottom: 1rem;
}

.chemdata-announcements .opportunities-contact {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    font-style: italic;
    color: var(--text-secondary);
}

.chemdata-announcements .opportunities-contact a {
    color: var(--color-primary);
    text-decoration: underline;
}

.chemdata-announcements .opportunities-contact a:hover {
    color: var(--color-secondary);
}




/* Publication Filters */
.pub-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.pub-filter-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pub-filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pub-filter-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.pub-card.hidden {
    display: none;
}

/* Publication Subpage Styles */
.pub-details-container {
    animation: fadeIn 0.4s ease-out forwards;
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: transform var(--transition-fast);
}

.back-link:hover {
    transform: translateX(-4px);
}

.pub-details-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

@media (min-width: 900px) {
    .pub-details-grid {
        grid-template-columns: 350px 1fr;
    }
}

.pub-details-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-medium);
}

.pub-details-image img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.pub-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
}

.pub-year-badge {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
}

.pd-title {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.pd-authors {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.pd-journal {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-style: italic;
}

.pd-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.pd-abstract-container h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.pd-abstract {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-secondary);

/* Publication Filters */
.pub-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.pub-filter-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pub-filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pub-filter-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.pub-card.hidden {
    display: none;
}

/* Publication Subpage Styles */
.pub-details-container {
    animation: fadeIn 0.4s ease-out forwards;
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: transform var(--transition-fast);
}

.back-link:hover {
    transform: translateX(-4px);
}

.pub-details-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

@media (min-width: 900px) {
    .pub-details-grid {
        grid-template-columns: 350px 1fr;
    }
}

.pub-details-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-medium);
}

.pub-details-image img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.pub-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
}

.pub-year-badge {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
}

.pd-title {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.pd-authors {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.pd-journal {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-style: italic;
}

.pd-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.pd-abstract-container h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.pd-abstract {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* Global utility classes */
.hidden { display: none !important; }

/* Title sizing */
.title-affix { font-size: 0.7em; font-weight: 500; opacity: 0.9; }