/* ============================================
   Mohamed Hanafy - Portfolio Website Styles
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Elegant Navy & Gold Theme */
    --primary: #1a365d;
    --primary-dark: #0f2744;
    --primary-light: #2c5282;
    --accent: #c9a227;
    --accent-light: #ddb94e;
    --accent-dark: #a68521;
    
    /* Neutrals */
    --white: #ffffff;
    --off-white: #f8f9fa;
    --gray-100: #f1f3f4;
    --gray-200: #e8eaed;
    --gray-300: #dadce0;
    --gray-400: #bdc1c6;
    --gray-500: #9aa0a6;
    --gray-600: #80868b;
    --gray-700: #5f6368;
    --gray-800: #3c4043;
    --gray-900: #202124;
    --black: #000000;
    
    /* Status Colors */
    --success: #34a853;
    --warning: #fbbc04;
    --info: #4285f4;
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Sans 3', 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
    
    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

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

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-800);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.3;
    color: var(--primary-dark);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.5rem, 3vw, 1.875rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p {
    margin-bottom: var(--space-md);
}

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

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

strong {
    font-weight: 600;
}

em {
    font-style: italic;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Section */
.section {
    padding: var(--space-3xl) 0;
}

.section.about {
    padding-top: var(--space-xl);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-title {
    margin-bottom: var(--space-md);
    position: relative;
    display: inline-block;
}

.section-line {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    margin: 0 auto var(--space-lg);
    border-radius: var(--radius-full);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

.subsection-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-xl);
    color: var(--primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.875rem 1.75rem;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--gray-300);
}

.btn-outline:hover {
    border-color: var(--primary);
    background: var(--primary);
    color: var(--white);
}

.btn-full {
    width: 100%;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

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

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-text {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border: 2px solid var(--primary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.nav-logo:hover .logo-text {
    background: var(--primary);
    color: var(--white);
}

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

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gray-700);
    position: relative;
    padding: var(--space-xs) 0;
}

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

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

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--primary);
    position: relative;
    transition: all var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--primary);
    transition: all var(--transition-base);
}

.hamburger::before { top: -7px; }
.hamburger::after { bottom: -7px; }

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--space-xl);
        gap: var(--space-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle.active .hamburger {
        background: transparent;
    }
    
    .nav-toggle.active .hamburger::before {
        transform: rotate(45deg);
        top: 0;
    }
    
    .nav-toggle.active .hamburger::after {
        transform: rotate(-45deg);
        bottom: 0;
    }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: auto;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 100px;
    padding-bottom: var(--space-2xl);
    overflow: hidden;
}

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

.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        rgba(26, 54, 93, 0.03) 0%, 
        rgba(201, 162, 39, 0.05) 50%,
        rgba(26, 54, 93, 0.03) 100%
    );
}

.hero-pattern {
    position: absolute;
    inset: 0;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%231a365d' fill-opacity='1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

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

.hero-greeting {
    font-size: 1.125rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.05em;
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: var(--space-md);
    line-height: 1.1;
}

.hero-title-wrapper {
    margin-bottom: var(--space-lg);
}

.hero-title {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 500;
    color: var(--gray-700);
    font-family: var(--font-body);
    margin-bottom: var(--space-xs);
}

.hero-institution {
    font-size: 1.125rem;
    color: var(--gray-500);
}

.hero-tagline {
    font-size: 1.125rem;
    color: var(--gray-600);
    font-style: italic;
    margin-bottom: var(--space-xl);
    padding-left: var(--space-md);
    border-left: 3px solid var(--accent);
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.hero-social {
    display: flex;
    gap: var(--space-md);
}

.hero-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 1.125rem;
    transition: all var(--transition-base);
}

.hero-social a:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    animation: fadeInRight 0.8s ease-out 0.2s backwards;
}

.image-frame {
    position: relative;
    z-index: 2;
}

.image-placeholder {
    width: 350px;
    height: 420px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    background: linear-gradient(135deg, var(--gray-200), var(--gray-100));
    position: relative;
}

.image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.placeholder-icon {
    position: absolute;
    inset: 0;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    gap: var(--space-md);
}

.placeholder-icon i {
    font-size: 4rem;
}

.placeholder-icon span {
    font-size: 0.875rem;
}

.image-decoration {
    position: absolute;
    width: 350px;
    height: 420px;
    border: 3px solid var(--accent);
    border-radius: var(--radius-lg);
    top: 20px;
    left: 20px;
    z-index: 1;
}

.scroll-indicator {
    display: none;
}

.scroll-arrow {
    display: block;
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--gray-400);
    border-bottom: 2px solid var(--gray-400);
    transform: rotate(45deg);
}

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

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

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

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-2xl);
    }
    
    .hero-image {
        order: -1;
    }
    
    .image-placeholder {
        width: 280px;
        height: 340px;
    }
    
    .image-decoration {
        width: 280px;
        height: 340px;
    }
    
    .hero-tagline {
        border-left: none;
        padding-left: 0;
        border-top: 3px solid var(--accent);
        padding-top: var(--space-md);
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-social {
        justify-content: center;
    }
}

/* ============================================
   About Section
   ============================================ */
.about {
    background: var(--off-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-3xl);
    align-items: start;
}

.about-intro {
    font-size: 1.25rem;
    color: var(--gray-700);
    margin-bottom: var(--space-lg);
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.highlight-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border-radius: var(--radius-md);
    color: var(--white);
    font-size: 1.25rem;
}

.highlight-text strong {
    display: block;
    font-size: 1rem;
    color: var(--primary-dark);
}

.highlight-text span {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.about-card {
    background: var(--white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border-top: 4px solid var(--accent);
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-lg);
    color: var(--primary);
}

.facts-list {
    list-style: none;
    margin-bottom: var(--space-xl);
}

.facts-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--gray-200);
}

.facts-list li:last-child {
    border-bottom: none;
}

.facts-list i {
    color: var(--accent);
    font-size: 1rem;
    margin-top: 4px;
}

@media (max-width: 968px) {
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Education Section - Card Grid (Awards Style)
   ============================================ */
.education {
    background: var(--white);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.edu-card {
    display: flex;
    gap: var(--space-lg);
    background: var(--off-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border-bottom: 3px solid transparent;
    cursor: pointer;
}

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

.edu-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-md);
    color: var(--white);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.edu-card-content {
    flex: 1;
}

.edu-year {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--space-xs);
}

.edu-title {
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--primary-dark);
}

.edu-institution {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: var(--space-sm);
}

.edu-field {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--accent-dark);
    margin-bottom: var(--space-sm);
}

.edu-location {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: var(--space-sm);
}

.edu-location i {
    margin-right: 4px;
    color: var(--primary);
}

.edu-description {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.edu-achievement {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: linear-gradient(135deg, rgba(201, 162, 39, 0.1), rgba(201, 162, 39, 0.05));
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-dark);
}

.edu-achievement i {
    color: var(--accent);
}

.edu-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.edu-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary);
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.edu-link:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

@media (max-width: 968px) {
    .education-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .edu-card {
        flex-direction: column;
        text-align: center;
    }
    
    .edu-icon {
        margin: 0 auto;
    }
    
    .edu-links {
        justify-content: center;
    }
    
    .edu-achievement {
        margin-left: auto;
        margin-right: auto;
    }
}

/* ============================================
   Honours & Awards Section
   ============================================ */
.awards {
    background: var(--off-white);
}

.awards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.award-card {
    display: flex;
    gap: var(--space-lg);
    background: var(--white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border-bottom: 3px solid transparent;
}

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

.award-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border-radius: var(--radius-md);
    color: var(--white);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.award-content {
    flex: 1;
}

.award-year {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: var(--space-xs);
}

.award-title {
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--primary-dark);
}

.award-institution {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: var(--space-sm);
}

.award-description {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 0;
    line-height: 1.6;
}

@media (max-width: 968px) {
    .awards-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .award-card {
        flex-direction: column;
        text-align: center;
    }
    
    .award-icon {
        margin: 0 auto;
    }
}

/* ============================================
   Research Section
   ============================================ */
.research {
    background: var(--white);
}

.interests-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-3xl);
}

.interest-card {
    text-align: center;
    padding: var(--space-xl);
    background: var(--off-white);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

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

.interest-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-full);
    color: var(--white);
    font-size: 1.75rem;
}

.interest-card h4 {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
    font-family: var(--font-body);
    font-weight: 600;
}

.interest-card p {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 0;
}

.projects-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.project-card {
    background: var(--off-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary);
    transition: all var(--transition-base);
}

.project-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.project-status {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.8rem;
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.status-complete {
    background: rgba(52, 168, 83, 0.1);
    color: var(--success);
}

.status-progress {
    background: rgba(66, 133, 244, 0.1);
    color: var(--info);
}

.status-preliminary {
    background: rgba(251, 188, 4, 0.1);
    color: var(--warning);
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    font-family: var(--font-body);
    font-weight: 600;
}

.project-description {
    color: var(--gray-600);
    margin-bottom: var(--space-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tag {
    font-size: 0.8rem;
    padding: var(--space-xs) var(--space-sm);
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-full);
    color: var(--gray-600);
}

@media (max-width: 968px) {
    .interests-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .interests-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Publications Section
   ============================================ */
.publications {
    background: var(--off-white);
}

.publications-list {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.publication-card {
    display: flex;
    gap: var(--space-xl);
    padding: var(--space-xl) 0;
    border-bottom: 1px solid var(--gray-200);
}

.publication-card:last-of-type {
    border-bottom: none;
}

.pub-year {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    min-width: 60px;
}

.pub-content {
    flex: 1;
}

.pub-title {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--primary-dark);
}

.pub-authors {
    font-size: 0.95rem;
    color: var(--gray-700);
    margin-bottom: var(--space-xs);
}

.pub-venue {
    font-size: 0.9rem;
    color: var(--gray-500);
    margin-bottom: var(--space-md);
}

.pub-links {
    display: flex;
    gap: var(--space-md);
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    color: var(--primary);
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.pub-link:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.publication-note {
    text-align: center;
    padding: var(--space-xl);
    background: var(--white);
    border-radius: var(--radius-md);
    margin-top: var(--space-xl);
}

.publication-note p {
    margin: 0;
    color: var(--gray-600);
}

.publication-note a {
    color: var(--primary);
    font-weight: 500;
}

/* ============================================
   Teaching Section
   ============================================ */
.teaching {
    background: var(--white);
}

.teaching-institution {
    margin-bottom: var(--space-3xl);
}

.teaching-institution:last-of-type {
    margin-bottom: var(--space-2xl);
}

.institution-name {
    font-size: 1.25rem;
    color: var(--primary);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--gray-200);
    font-family: var(--font-body);
    font-weight: 600;
}

.institution-name i {
    color: var(--accent);
    margin-right: var(--space-sm);
}

.institution-name a {
    color: var(--primary);
    margin-right: 0;
    padding-right: 0;
}

.teaching-responsibilities {
    background: var(--off-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-xl);
    border-left: 4px solid var(--accent);
}

.teaching-responsibilities p {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    color: var(--primary-dark);
    line-height: 1.35;
    margin: 0;
    font-family: var(--font-display);
}

.teaching-responsibilities strong {
    font-weight: 700;
    color: var(--primary-dark);
}

.teaching-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.teaching-card {
    background: var(--off-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    border-bottom: 3px solid transparent;
}

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

.course-code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: var(--space-sm);
}

.course-name {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--primary-dark);
}

.course-description {
    font-size: 0.95rem;
    color: var(--gray-600);
    margin-bottom: var(--space-md);
}

.course-meta {
    display: flex;
    gap: var(--space-lg);
    font-size: 0.85rem;
    color: var(--gray-500);
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.course-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary);
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.course-link:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.course-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.course-name a {
    color: var(--primary-dark);
    transition: color var(--transition-fast);
}

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

.institution-name a {
    color: var(--primary);
    transition: color var(--transition-fast);
}

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

.teaching-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--gray-500);
    margin-top: var(--space-sm);
}

@media (max-width: 768px) {
    .teaching-grid {
        grid-template-columns: 1fr;
    }
    
    .teaching-stats {
        flex-direction: column;
        gap: var(--space-xl);
    }
}

/* ============================================
   Conferences Section
   ============================================ */
.conferences {
    background: var(--off-white);
}

.conferences-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.conference-card {
    display: flex;
    gap: var(--space-lg);
    background: var(--white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border-left: 4px solid var(--primary);
}

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

.conference-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-md);
    color: var(--white);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.conference-content {
    flex: 1;
}

.conference-year {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: var(--space-xs);
}

.conference-title {
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--primary-dark);
}

.conference-venue {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: var(--space-md);
}

.conference-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.conference-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary);
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.conference-link:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

@media (max-width: 768px) {
    .conferences-grid {
        grid-template-columns: 1fr;
    }
    
    .conference-card {
        flex-direction: column;
    }
    
    .conference-icon {
        width: 50px;
        height: 50px;
    }
}

/* ============================================
   Skills Section
   ============================================ */
.skills {
    background: var(--off-white);
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.skills-category {
    background: var(--white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.category-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.125rem;
    margin-bottom: var(--space-lg);
    color: var(--primary);
    font-family: var(--font-body);
    font-weight: 600;
}

.category-title i {
    color: var(--accent);
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.skill-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--off-white);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--gray-700);
    transition: all var(--transition-fast);
}

.skill-item:hover {
    background: var(--primary);
    color: var(--white);
}

.skill-item i {
    font-size: 1.25rem;
}

.skill-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

.skill-item:hover .skill-icon {
    background: var(--white);
    color: var(--primary);
}

@media (max-width: 768px) {
    .skills-container {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Skills Section (New)
   ============================================ */
.skills {
    background: var(--off-white);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-lg);
    max-width: 900px;
    margin: 0 auto;
}

.skill-card {
    background: var(--white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border-bottom: 3px solid transparent;
}

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

.skill-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-md);
    color: var(--white);
    font-size: 1.5rem;
    margin: 0 auto var(--space-md);
}

.skill-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-dark);
    font-family: var(--font-body);
}

/* ============================================
   Publications Section
   ============================================ */
.publications {
    background: var(--white);
}

.publications-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.publications-intro {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--space-xl);
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    background: var(--off-white);
}

.contact-content {
    display: flex;
    justify-content: center;
}

.contact-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    max-width: 500px;
    text-align: center;
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.contact-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--off-white);
    border-radius: var(--radius-md);
    color: var(--primary);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact-details {
    text-align: center;
}

.contact-details h4 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
    font-family: var(--font-body);
    font-weight: 600;
}

.contact-details p,
.contact-details a {
    font-size: 0.95rem;
    color: var(--gray-600);
}

.contact-details a:hover {
    color: var(--primary);
}

.contact-social {
    text-align: center;
}

.contact-social h4 {
    font-size: 1rem;
    margin-bottom: var(--space-md);
    font-family: var(--font-body);
    font-weight: 600;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

.social-links-named {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.social-link-named {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--off-white);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    font-weight: 500;
    transition: all var(--transition-base);
    border: 1px solid var(--gray-300);
}

.social-link-named:hover {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.social-link-named i {
    font-size: 1.25rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    transition: all var(--transition-base);
}

.social-link.linkedin {
    background: #0077b5;
    color: var(--white);
}

.social-link.github {
    background: #333;
    color: var(--white);
}

.social-link.scholar {
    background: #4285f4;
    color: var(--white);
}

.social-link.researchgate {
    background: #00ccbb;
    color: var(--white);
}

.social-link.orcid {
    background: #a6ce39;
    color: var(--white);
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.contact-form-wrapper {
    background: var(--off-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input,
.form-group textarea {
    padding: var(--space-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: var(--white);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

@media (max-width: 768px) {
    .contact-content {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--primary-dark);
    color: var(--gray-400);
    padding: var(--space-xl) 0;
}

.footer-content {
    text-align: center;
}

.footer-text {
    margin-bottom: var(--space-sm);
}

.footer-credits {
    font-size: 0.875rem;
}

.footer-credits i {
    color: #e74c3c;
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-full);
    font-size: 1rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--accent);
    transform: translateY(-3px);
}

/* ============================================
   Utilities
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Print Styles */
@media print {
    .navbar,
    .hero-social,
    .hero-cta,
    .back-to-top,
    .scroll-indicator,
    .contact-form-wrapper {
        display: none !important;
    }
    
    .section {
        padding: var(--space-xl) 0;
        page-break-inside: avoid;
    }
    
    body {
        font-size: 12pt;
    }
}