/* ============================================================================
   ACADEMIC CV WEBSITE - ENHANCED STYLESHEET
   Professional, accessible, and visually appealing design with light/dark mode
   ============================================================================ */

/* ============================================================================
   CSS CUSTOM PROPERTIES (Variables)
   ============================================================================ */

:root {
    /* Light Mode Colors - Enhanced Palette */
    --color-bg-primary: #fafaf8;
    --color-bg-secondary: #f5f5f3;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a4a4a;
    --color-text-muted: #6a6a6a;
    --color-accent: #0d5f7a;
    --color-accent-light: #e0f2f7;
    --color-accent-secondary: #d4a574;
    --color-accent-secondary-light: #f5ede3;
    --color-border: #e0e0e0;
    --color-link: #0d5f7a;
    --color-link-hover: #054a5f;
    --color-success: #2d7a4a;
    
    /* Dark Mode Colors */
    --color-bg-primary-dark: #0a0f14;
    --color-bg-secondary-dark: #151b24;
    --color-text-primary-dark: #f5f5f5;
    --color-text-secondary-dark: #d5d5d5;
    --color-text-muted-dark: #a8a8a8;
    --color-accent-dark: #4db8d8;
    --color-accent-light-dark: #0d3a47;
    --color-accent-secondary-dark: #d4a574;
    --color-accent-secondary-light-dark: #2a2416;
    --color-border-dark: #2a3038;
    --color-link-dark: #5db8d8;
    --color-link-hover-dark: #7ec8e0;

    /* Typography */
    --font-serif: 'Georgia', 'Garamond', 'Cambria', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Typography Scale */
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    /* Line Heights */
    --line-height-tight: 1.3;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* Dark mode variables override */
[data-theme="dark"] {
    --color-bg-primary: var(--color-bg-primary-dark);
    --color-bg-secondary: var(--color-bg-secondary-dark);
    --color-text-primary: var(--color-text-primary-dark);
    --color-text-secondary: var(--color-text-secondary-dark);
    --color-text-muted: var(--color-text-muted-dark);
    --color-accent: var(--color-accent-dark);
    --color-accent-light: var(--color-accent-light-dark);
    --color-accent-secondary-light: var(--color-accent-secondary-light-dark);
    --color-border: var(--color-border-dark);
    --color-link: var(--color-link-dark);
    --color-link-hover: var(--color-link-hover-dark);
}

/* ============================================================================
   RESET & BASE STYLES
   ============================================================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ============================================================================
   ACCESSIBILITY
   ============================================================================ */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-sm);
    text-decoration: none;
    z-index: 100;
    border-radius: 0 0 4px 0;
}

.skip-link:focus {
    top: 0;
}

/* Focus visible styles for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Ensure touch targets are at least 44x44px */
button, a, input {
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    letter-spacing: -0.5px;
}

h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
    border-bottom: 3px solid var(--color-accent);
    padding-bottom: var(--spacing-md);
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    height: 3px;
    width: 60px;
    background: linear-gradient(90deg, var(--color-accent-secondary) 0%, transparent 100%);
    border-radius: 2px;
}

h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

p:last-child {
    margin-bottom: 0;
}

ul, ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

li {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

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

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

strong {
    font-weight: 700;
    color: var(--color-text-primary);
}

em {
    font-style: italic;
}

/* ============================================================================
   LAYOUT COMPONENTS
   ============================================================================ */

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================================================
   HEADER & NAVIGATION
   ============================================================================ */

.header {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    border-bottom: 2px solid var(--color-accent);
    position: sticky;
    top: 0;
    z-index: 50;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-text {
    font-family: var(--font-serif);
    font-size: var(--font-size-lg);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Theme Toggle Button */
.theme-toggle {
    background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent-secondary-light) 100%);
    border: 2px solid var(--color-accent);
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 8px;
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
    color: white;
    border-color: var(--color-accent-secondary);
}

.theme-icon {
    display: inline-block;
}

/* ============================================================================
   HERO SECTION
   ============================================================================ */

.hero {
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 50%, var(--color-accent-light) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--color-accent-light) 0%, transparent 70%);
    border-radius: 50%;
    opacity: 0.3;
    z-index: 0;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.hero-role {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-serif);
    letter-spacing: 0.5px;
}

.hero-headline {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 500;
}

.hero-summary {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    background: rgba(255, 255, 255, 0.5);
    padding: var(--spacing-lg);
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

[data-theme="dark"] .hero-summary {
    background: rgba(0, 0, 0, 0.3);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.hero-links {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.profile-link {
    font-size: var(--font-size-base);
    color: var(--color-link);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    padding-bottom: 4px;
    font-weight: 500;
}

.profile-link:hover {
    border-bottom-color: var(--color-link);
    color: var(--color-link-hover);
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: 8px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    min-height: 44px;
    box-shadow: var(--shadow-sm);
    letter-spacing: 0.3px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
    color: white;
    border-color: transparent;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, var(--color-link-hover) 0%, var(--color-accent-secondary) 100%);
}

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

.btn-secondary:hover {
    background: var(--color-accent-light);
    border-color: var(--color-link-hover);
    color: var(--color-link-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ============================================================================
   SECTIONS
   ============================================================================ */

section {
    padding: var(--spacing-2xl) var(--spacing-lg);
}

section:nth-child(even) {
    background-color: var(--color-bg-secondary);
}

/* ============================================================================
   ABOUT SECTION
   ============================================================================ */

.about .container p {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
}

/* ============================================================================
   RESEARCH FOCUS SECTION
   ============================================================================ */

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.research-card {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-accent-light) 100%);
    border-left: 4px solid var(--color-accent);
    border-radius: 8px;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .research-card {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-accent-light-dark) 100%);
}

.research-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--color-accent-secondary);
}

.research-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.research-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* ============================================================================
   EXPERIENCE SECTION
   ============================================================================ */

.timeline {
    margin-top: var(--spacing-lg);
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 5px;
    top: 20px;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
}

.timeline-item {
    display: flex;
    margin-bottom: var(--spacing-2xl);
    position: relative;
    padding-left: var(--spacing-lg);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -4px;
    top: 8px;
    width: 16px;
    height: 16px;
    background-color: var(--color-accent);
    border-radius: 50%;
    border: 3px solid var(--color-bg-primary);
    box-shadow: 0 0 0 3px var(--color-accent-light);
    transition: all var(--transition-fast);
}

[data-theme="dark"] .timeline-item::before {
    border-color: var(--color-bg-primary-dark);
    box-shadow: 0 0 0 3px var(--color-accent-light-dark);
}

.timeline-item:hover::before {
    width: 20px;
    height: 20px;
    left: -6px;
    background-color: var(--color-accent-secondary);
}

.timeline-date {
    font-weight: 700;
    color: var(--color-accent);
    min-width: 100px;
    margin-right: var(--spacing-lg);
    font-size: var(--font-size-sm);
    background: var(--color-accent-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 6px;
}

[data-theme="dark"] .timeline-date {
    background: var(--color-accent-light-dark);
}

.timeline-content h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.organization {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    font-style: italic;
    font-weight: 500;
}

.timeline-content ul {
    margin-left: var(--spacing-lg);
    margin-bottom: 0;
}

.timeline-content li {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.experience-link {
    margin-top: var(--spacing-xl);
    text-align: center;
}

.link-button {
    display: inline-block;
    color: var(--color-link);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    padding-bottom: 4px;
    transition: all var(--transition-fast);
    background: linear-gradient(90deg, var(--color-accent-light) 0%, transparent 100%);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 6px;
}

.link-button:hover {
    border-bottom-color: var(--color-link);
    background: linear-gradient(90deg, var(--color-accent) 0%, transparent 100%);
    color: white;
}

/* ============================================================================
   SKILLS SECTION
   ============================================================================ */

.skills-group {
    margin-bottom: var(--spacing-2xl);
}

.skills-group h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-accent-light);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent-secondary-light) 100%);
    color: var(--color-accent);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
    border: 2px solid var(--color-accent);
    box-shadow: var(--shadow-sm);
    letter-spacing: 0.2px;
}

[data-theme="dark"] .skill-tag {
    background: linear-gradient(135deg, var(--color-accent-light-dark) 0%, var(--color-accent-secondary-light-dark) 100%);
    color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
}

.skill-tag:hover {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent-secondary);
}

/* ============================================================================
   PUBLICATIONS SECTION
   ============================================================================ */

.publications-list {
    margin-bottom: var(--spacing-2xl);
}

.publication {
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--color-accent);
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-accent-light) 100%);
    border-radius: 8px;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .publication {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-accent-light-dark) 100%);
}

.publication:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.publication p {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin-bottom: 0;
}

.conferences {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-accent-light);
    border-radius: 8px;
}

[data-theme="dark"] .conferences {
    background: var(--color-accent-light-dark);
}

.conferences h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.conferences ul {
    margin-left: var(--spacing-lg);
}

.conferences li {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.publications-link {
    margin-top: var(--spacing-lg);
    text-align: center;
}

/* ============================================================================
   EDUCATION SECTION
   ============================================================================ */

.education-list {
    margin-top: var(--spacing-lg);
}

.education-item {
    display: flex;
    margin-bottom: var(--spacing-lg);
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-accent-light) 100%);
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .education-item {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-accent-light-dark) 100%);
}

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

.education-date {
    font-weight: 700;
    color: var(--color-accent);
    min-width: 100px;
    font-size: var(--font-size-sm);
}

.education-content h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.institution {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
}

.education-status {
    font-size: var(--font-size-sm);
    color: var(--color-success);
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

/* ============================================================================
   PROJECTS SECTION
   ============================================================================ */

.projects-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.project-item {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-accent-secondary-light) 100%);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .project-item {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-accent-secondary-light-dark) 100%);
    border-color: var(--color-border-dark);
}

.project-item:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-left: 4px solid var(--color-accent);
}

.project-item h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-lg);
}

.project-item p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

/* ============================================================================
   CONTACT SECTION
   ============================================================================ */

.contact-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-accent-secondary-light) 100%);
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

[data-theme="dark"] .contact-intro {
    background: linear-gradient(135deg, var(--color-accent-light-dark) 0%, var(--color-accent-secondary-light-dark) 100%);
}

.contact-info {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.contact-info p {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
}

.contact-info a {
    color: var(--color-link);
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    font-weight: 600;
}

.contact-info a:hover {
    border-bottom-color: var(--color-link);
    color: var(--color-link-hover);
}

.contact-links {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.contact-link {
    color: white;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    padding: var(--spacing-sm) var(--spacing-lg);
    transition: all var(--transition-fast);
    font-weight: 600;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
    border-radius: 6px;
    box-shadow: var(--shadow-sm);
}

.contact-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

/* ============================================================================
   FOOTER
   ============================================================================ */

.footer {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    border-top: 2px solid var(--color-accent);
    padding: var(--spacing-lg);
    text-align: center;
    margin-top: var(--spacing-2xl);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.08);
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: 0;
    font-weight: 500;
}

.footer-cv-link {
    color: white;
    font-weight: 600;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    padding: var(--spacing-xs) var(--spacing-md);
    transition: all var(--transition-fast);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
    border-radius: 6px;
    box-shadow: var(--shadow-sm);
}

.footer-cv-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

/* Tablet (768px and below) */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
        --spacing-2xl: 2.5rem;
        --spacing-xl: 2rem;
    }

    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .hero::before {
        width: 300px;
        height: 300px;
        top: -30%;
        right: -20%;
    }

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

    .btn {
        width: 100%;
        max-width: 250px;
    }

    section {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .timeline::before {
        left: 3px;
    }

    .timeline-item {
        padding-left: var(--spacing-md);
    }

    .timeline-date {
        min-width: 80px;
        margin-right: var(--spacing-md);
    }

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

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

    .education-item {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    h1 {
        font-size: var(--font-size-3xl);
    }
}

/* Mobile (375px and below) */
@media (max-width: 375px) {
    :root {
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.25rem;
        --font-size-2xl: 1.125rem;
        --spacing-2xl: 1.5rem;
        --spacing-xl: 1.25rem;
        --spacing-lg: 1rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    h2 {
        font-size: var(--font-size-2xl);
    }

    .hero {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .hero::before {
        display: none;
    }

    .hero h1 {
        margin-bottom: var(--spacing-md);
    }

    .hero-role {
        font-size: var(--font-size-xl);
    }

    .hero-headline {
        font-size: var(--font-size-base);
    }

    .hero-links {
        gap: var(--spacing-md);
    }

    section {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .timeline-item {
        padding-left: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }

    .skill-tags {
        gap: var(--spacing-xs);
    }

    .skill-tag {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .nav-container {
        gap: var(--spacing-md);
    }

    .logo-text {
        font-size: var(--font-size-base);
    }

    .hero-summary {
        padding: var(--spacing-md);
    }
}

/* ============================================================================
   PRINT STYLES
   ============================================================================ */

@media print {
    body {
        background-color: white;
        color: black;
    }

    .header,
    .footer,
    .theme-toggle,
    .hero-actions,
    .skip-link {
        display: none;
    }

    section {
        page-break-inside: avoid;
        padding: var(--spacing-lg) 0;
    }

    a {
        color: black;
        text-decoration: underline;
    }

    .timeline-item::before {
        border-color: white;
    }

    h1 {
        -webkit-text-fill-color: black;
        color: black;
    }

    .logo-text {
        -webkit-text-fill-color: black;
        color: black;
    }
}