/* ============================================
   CSS Variables & Root Styles
   ============================================ */
:root {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a25;
    --color-text: #e8e8ed;
    --color-text-muted: #8888a0;
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-accent: #f59e0b;
    --color-accent-pink: #ec4899;
    --color-success: #10b981;
    --color-border: rgba(255, 255, 255, 0.08);
    
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 8rem;
    
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

ul { list-style: none; }

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }

.section-title {
    text-align: center;
    margin-bottom: var(--space-xl);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent-pink));
    border-radius: var(--radius-full);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-primary);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

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

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

.logo-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--space-sm);
}

.nav-link {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

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

.nav-link-cv {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)) !important;
    color: white !important;
    font-weight: 600 !important;
    border: 1px solid var(--color-primary) !important;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.3) !important;
}

.nav-link-cv:hover,
.nav-link-cv:active,
.nav-link-cv.active {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary)) !important;
    color: white !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4) !important;
}

.nav-link-cv i {
    margin-right: var(--space-xs);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: var(--space-2xl) 0;
    overflow: hidden;
}

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

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary), transparent);
    top: -200px;
    right: -100px;
    animation: float 20s ease-in-out infinite;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--color-accent-pink), transparent);
    bottom: -100px;
    left: -100px;
    animation: float 15s ease-in-out infinite reverse;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--color-accent), transparent);
    top: 50%;
    left: 30%;
    animation: float 18s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 30px) scale(1.02); }
}

.hero-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.hero-greeting {
    font-size: 1.1rem;
    color: var(--color-primary-light);
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.hero-name {
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-text), var(--color-text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    align-items: center;
    margin-bottom: var(--space-lg);
}

.hero-title {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
}

.hero-separator { color: var(--color-text-muted); }

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    max-width: 540px;
}

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

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

.hero-social a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

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

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.image-frame {
    width: 380px;
    height: 450px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 2px solid var(--color-border);
    background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-bg-tertiary));
}

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

.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    color: var(--color-text-muted);
    text-align: center;
    padding: var(--space-md);
}

.image-placeholder i {
    font-size: 3rem;
    opacity: 0.3;
}

.floating-badge {
    position: absolute;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    animation: badgeFloat 4s ease-in-out infinite;
}

.badge-1 { top: 20%; right: -20px; }
.badge-1 i { color: var(--color-accent); }

.badge-2 {
    bottom: 20%;
    left: -20px;
    flex-direction: column;
    padding: var(--space-md);
    animation-delay: -2s;
}

.badge-2 .gpa {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-success);
}

.badge-2 .gpa-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

@keyframes badgeFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-muted);
    font-size: 0.8rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.5; transform: scaleY(0.8); }
}

/* About Section */
.about {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-secondary);
}

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

.about-text { font-size: 1.05rem; }

.about-text .lead {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
}

.about-text p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.about-text strong { color: var(--color-accent); }

.skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.skill-category {
    background: var(--color-bg-tertiary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.skill-category h3 {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

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

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

.skill-tag {
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* Education Section */
.education { padding: var(--space-2xl) 0; }

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-accent-pink), var(--color-accent));
}

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

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

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 3px solid var(--color-bg);
}

.timeline-content {
    background: var(--color-bg-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.edu-header {
    display: grid;
    grid-template-columns: 80px 1fr auto;
    gap: var(--space-md);
    align-items: start;
    margin-bottom: var(--space-md);
}

.edu-logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    background: white;
    border-radius: var(--radius-md);
    padding: var(--space-sm);
}

.edu-info h3 { margin-bottom: var(--space-xs); }

.edu-info .degree {
    color: var(--color-primary-light);
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.edu-info .location {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.edu-info .location i { margin-right: var(--space-xs); }

.edu-date {
    text-align: right;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.edu-date span:first-child {
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.gpa-badge {
    background: linear-gradient(135deg, var(--color-success), #059669);
    color: white;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
}

.edu-details {
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.edu-details p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--space-xs);
}

.edu-details strong { color: var(--color-text); }

/* Publications Section */
.publications {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-secondary);
}

.pub-grid {
    display: grid;
    gap: var(--space-lg);
    max-width: 900px;
    margin: 0 auto;
}

.pub-card {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.pub-card:hover {
    border-color: var(--color-primary);
    transform: translateX(10px);
}

.pub-year {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.pub-content h3 {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.pub-authors {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--space-sm);
}

.pub-journal {
    color: var(--color-accent);
    font-size: 0.9rem;
    margin-bottom: var(--space-md);
}

.pub-journal i { margin-right: var(--space-xs); }

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

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

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

/* Projects Section */
.projects { padding: var(--space-2xl) 0; }

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.project-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.1);
}

.project-card.featured {
    grid-column: span 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.project-card.featured .project-image { height: 100%; }

.project-image {
    height: 200px;
    background: var(--color-bg-tertiary);
    overflow: hidden;
    position: relative;
    cursor: pointer;
}

/* Increase height for smaller cards to show images better */
.project-card:not(.featured) .project-image {
    height: 280px;
    min-height: 280px;
}

.project-card.featured .project-image {
    overflow: visible;
}

/* Smaller cards need less padding to show full images */
.project-card:not(.featured) .slideshow-container {
    padding: var(--space-md);
}

.project-card:not(.featured) .slideshow-image {
    top: var(--space-md);
    left: var(--space-md);
    width: calc(100% - (var(--space-md) * 2));
    height: calc(100% - (var(--space-md) * 2));
    opacity: 0 !important;
    visibility: hidden;
}

.project-card:not(.featured) .slideshow-image.active {
    opacity: 1 !important;
    visibility: visible;
}

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

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

/* Project Slideshow */
.project-slideshow {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: visible;
}

.slideshow-container {
    position: relative;
    width: 100%;
    height: 100%;
    padding: var(--space-lg);
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slideshow-image {
    position: absolute;
    top: var(--space-lg);
    left: var(--space-lg);
    width: calc(100% - (var(--space-lg) * 2));
    height: calc(100% - (var(--space-lg) * 2));
    object-fit: contain;
    object-position: center;
    background: var(--color-bg-tertiary);
    opacity: 0 !important;
    visibility: hidden;
    transition: opacity 0.5s ease-in-out, visibility 0.5s ease-in-out;
    border-radius: var(--radius-md);
    cursor: pointer;
    max-width: 100%;
    max-height: 100%;
}

.slideshow-image:hover {
    opacity: 0.95 !important;
}

.slideshow-image.active {
    opacity: 1 !important;
    visibility: visible;
    z-index: 1;
}

.slideshow-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    background: rgba(10, 10, 15, 0.8);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
    transition: all var(--transition-fast);
    opacity: 0;
}

.project-slideshow:hover .slideshow-nav {
    opacity: 1;
}

.slideshow-nav:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-50%) scale(1.1);
}

.slideshow-prev {
    left: var(--space-md);
}

.slideshow-next {
    right: var(--space-md);
}

.slideshow-indicator {
    position: absolute;
    bottom: var(--space-sm);
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    gap: var(--space-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.project-slideshow:hover .slideshow-indicator {
    opacity: 1;
}

.slideshow-indicator::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.slideshow-indicator.active::before {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

/* Project Details Dropdown */
.project-details-toggle {
    width: 100%;
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all var(--transition-fast);
}

.project-details-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-text);
    background: var(--color-bg-tertiary);
}

.project-details-toggle i {
    transition: transform var(--transition-base);
}

.project-details-toggle.active i {
    transform: rotate(180deg);
}

.project-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    padding: 0;
    margin-top: 0;
}

.project-details.active {
    max-height: 500px;
    padding: var(--space-md) 0;
    margin-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.project-details p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--space-sm);
}

.project-details code {
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--color-primary-light);
}

.project-details em {
    color: var(--color-text);
    font-style: italic;
}

/* White background for certain project images */
.project-image.white-bg {
    background: white;
}

.project-image.white-bg .slideshow-image {
    object-fit: contain;
    object-position: center;
    background: white;
}

/* Image Modal/Popup */
.image-modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    animation: fadeIn 0.3s ease;
}

.image-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content-wrapper {
    position: relative;
    width: 90%;
    max-width: 1200px;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-image-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-image {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    background: var(--color-bg);
    padding: var(--space-md);
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transition: all var(--transition-fast);
    z-index: 10001;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 10001;
    backdrop-filter: blur(10px);
}

.modal-nav:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-50%) scale(1.1);
}

.modal-nav-prev {
    left: var(--space-lg);
}

.modal-nav-next {
    right: var(--space-lg);
}

.modal-counter {
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    font-size: 0.9rem;
    background: rgba(255, 255, 255, 0.1);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
}

@media (max-width: 768px) {
    .modal-content-wrapper {
        width: 95%;
    }
    
    .modal-nav {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }
    
    .modal-nav-prev {
        left: var(--space-sm);
    }
    
    .modal-nav-next {
        right: var(--space-sm);
    }
    
    .modal-close {
        top: -30px;
        width: 35px;
        height: 35px;
        font-size: 1.5rem;
    }
}

.project-content { padding: var(--space-lg); }

.project-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent-pink));
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-md);
}

.project-content h3 {
    font-family: var(--font-body);
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
}

.project-content p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--space-md);
}

.project-content strong { color: var(--color-accent); }

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.project-tech span {
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--color-text-muted);
}

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

.project-links a {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-primary-light);
    font-size: 0.9rem;
    font-weight: 500;
}

.project-links a:hover { color: var(--color-text); }

/* Experience Section */
.experience {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-secondary);
}

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

.exp-card {
    display: flex;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.exp-card:hover { border-color: var(--color-primary); }

.exp-icon {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent-pink));
    border-radius: var(--radius-md);
    color: white;
    font-size: 1.2rem;
}

.exp-content h3 {
    font-family: var(--font-body);
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.exp-company {
    color: var(--color-primary-light);
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.exp-date {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-family: var(--font-mono);
    margin-bottom: var(--space-md);
}

.exp-content ul { list-style: none; }

.exp-content li {
    position: relative;
    padding-left: var(--space-md);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--space-xs);
}

.exp-content li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* Awards Section */
.awards { 
    padding: var(--space-2xl) 0; 
    background: var(--color-bg-secondary);
}

.awards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
}

.award-card {
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

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

.award-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent), #d97706);
    border-radius: 50%;
    font-size: 1.5rem;
    color: white;
}

.award-content h3 {
    font-family: var(--font-body);
    font-size: 1rem;
    margin-bottom: var(--space-sm);
}

.award-content p {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-bottom: var(--space-sm);
}

.award-year {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-primary-light);
}

/* Certifications Section */
.certifications { 
    padding: var(--space-2xl) 0;
    background: var(--color-bg);
}

.certifications .section-title {
    color: var(--color-text);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.cert-card {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.cert-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.15);
}

.cert-icon {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent-pink));
    border-radius: var(--radius-md);
    color: white;
    font-size: 1.2rem;
}

.cert-content {
    flex: 1;
}

.cert-content h3 {
    font-family: var(--font-body);
    font-size: 1rem;
    margin-bottom: var(--space-xs);
}

.cert-org {
    color: var(--color-primary-light);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

.cert-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.cert-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-primary-light);
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: var(--space-xs);
    transition: color var(--transition-fast);
}

.cert-link:hover {
    color: var(--color-text);
}

.cert-link i {
    font-size: 0.75rem;
}

/* Contact Section */
.contact {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-secondary);
    text-align: center;
}

.contact-text {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin-bottom: var(--space-xl);
}

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

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg) var(--space-xl);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
}

.contact-card i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.contact-card span { font-weight: 500; }

/* Footer */
.footer {
    padding: var(--space-lg) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Page-Specific Styles */
.page-header {
    padding: calc(80px + var(--space-xl)) 0 var(--space-xl);
    background: var(--color-bg-secondary);
    text-align: center;
}

.page-content { padding: var(--space-2xl) 0; }

/* Friends Page */
.friends-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.friend-card {
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.friend-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
}

.friend-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    margin: 0 auto var(--space-md);
    overflow: hidden;
    border: 3px solid var(--color-border);
}

.friend-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.friend-card h3 {
    font-family: var(--font-body);
    margin-bottom: var(--space-xs);
}

.friend-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Blog Page */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-lg);
}

.blog-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.blog-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
}

.blog-image {
    height: 200px;
    overflow: hidden;
}

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

.blog-content { padding: var(--space-lg); }

.blog-date {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-family: var(--font-mono);
    margin-bottom: var(--space-sm);
}

.blog-content h3 {
    font-family: var(--font-body);
    margin-bottom: var(--space-sm);
}

.blog-content p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* Piano Page */
.piano-content {
    max-width: 800px;
    margin: 0 auto;
}

.video-grid {
    display: grid;
    gap: var(--space-lg);
}

.video-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.video-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-info { padding: var(--space-lg); }

.video-info h3 {
    font-family: var(--font-body);
    margin-bottom: var(--space-sm);
}

.video-info p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* World Page */
/* The navbar is position:fixed (floats above content), so a full 100vh
   section placed right after it fills the entire viewport edge-to-edge —
   the page is just "navbar + map", no header/footer/container chrome. */
body.world-page {
    overflow: hidden;
}

.world-fullscreen {
    position: relative;
    width: 100%;
    height: 100vh;
}

.world-map {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    background: var(--color-bg-tertiary);
}

/* Leaflet's default zoom control sits top-left, which the fixed navbar
   would otherwise cover — moved to bottom-left in JS (L.control.zoom
   with position: 'bottomleft'); this just styles it to match the theme. */
.leaflet-control-zoom a {
    background: rgba(10, 10, 15, 0.85) !important;
    color: var(--color-text) !important;
    border-color: var(--color-border) !important;
}

.leaflet-control-zoom a:hover {
    background: var(--color-bg-tertiary) !important;
}

/* Leaflet popup/attribution theming to match the dark site */
.leaflet-popup-content-wrapper,
.leaflet-popup-tip {
    background: var(--color-bg-secondary);
    color: var(--color-text);
}

.leaflet-popup-content {
    font-family: var(--font-body);
    margin: var(--space-sm) var(--space-md);
}

.leaflet-popup-content strong { color: var(--color-accent); }

.leaflet-container a.leaflet-popup-close-button {
    color: var(--color-text-muted);
}

.leaflet-control-attribution {
    background: rgba(10, 10, 15, 0.7) !important;
    color: var(--color-text-muted) !important;
}

.leaflet-control-attribution a { color: var(--color-primary-light) !important; }

/* RTL Support for Persian Blog Posts */
.rtl {
    direction: rtl;
    text-align: right;
}

.rtl .blog-content { text-align: right; }

/* Responsive Design */
@media (max-width: 1200px) {
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
    .project-card.featured { grid-column: span 2; }
    .awards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-title-wrapper { justify-content: center; }
    .hero-description { margin: 0 auto var(--space-lg); }
    .hero-cta { justify-content: center; }
    .hero-social { justify-content: center; }
    .hero-image { order: -1; }
    .floating-badge { display: none; }
    .about-content { grid-template-columns: 1fr; }
    .exp-grid { grid-template-columns: 1fr; }
    .edu-header { grid-template-columns: 60px 1fr; }
    .edu-date {
        grid-column: 1 / -1;
        text-align: left;
        flex-direction: row;
        margin-top: var(--space-sm);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-sm);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        border-bottom: 1px solid var(--color-border);
    }
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    .nav-toggle { display: flex; }
    .projects-grid { grid-template-columns: 1fr; }
    .project-card.featured {
        grid-column: span 1;
        display: block;
    }
    .project-card.featured .project-image { height: 200px; }
    .pub-card { grid-template-columns: 1fr; }
    .pub-year { margin-bottom: var(--space-sm); }
    .contact-links { flex-wrap: wrap; }
    .image-frame {
        width: 280px;
        height: 350px;
    }
}

@media (max-width: 576px) {
    html { font-size: 14px; }
    .container { padding: 0 var(--space-md); }
    .hero-cta { flex-direction: column; }
    .btn {
        width: 100%;
        justify-content: center;
    }
    .skills-grid { grid-template-columns: 1fr; }
    .awards-grid { grid-template-columns: 1fr; }
    .timeline::before { display: none; }
    .timeline-item { padding-left: 0; }
    .timeline-marker { display: none; }
}


/* Featured projects full width */
.project-card.featured {
    grid-column: 1 / -1; /* Span all columns */
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.project-card.featured .project-image {
    height: 100%;
    min-height: 400px;
}

.project-card.featured .project-image img {
    object-fit: contain; /* Show full image without cropping */
    background: white;
}

.project-card.featured .project-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Responsive - stack on mobile */
@media (max-width: 768px) {
    .project-card.featured {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured .project-image {
        min-height: 300px;
    }
}


.image-slider {
    position: relative;
    width: 100%;
    height: 100%;
}

.image-slider img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    animation: imageSlide 30s infinite;
}

.image-slider img:nth-child(1) { animation-delay: 0s; }
.image-slider img:nth-child(2) { animation-delay: 3s; }
.image-slider img:nth-child(3) { animation-delay: 6s; }
.image-slider img:nth-child(4) { animation-delay: 9s; }
.image-slider img:nth-child(5) { animation-delay: 12s; }
.image-slider img:nth-child(6) { animation-delay: 15s; }
.image-slider img:nth-child(7) { animation-delay: 18s; }
.image-slider img:nth-child(8) { animation-delay: 21s; }
.image-slider img:nth-child(9) { animation-delay: 24s; }
.image-slider img:nth-child(10) { animation-delay: 27s; }

@keyframes imageSlide {
    0% { opacity: 0; }
    3% { opacity: 1; }
    10% { opacity: 1; }
    13% { opacity: 0; }
    100% { opacity: 0; }
}