/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Variables */
    --primary-bg: #0a0e1a;
    --secondary-bg: #1a1f2e;
    --card-bg: #252a3a;
    --border-color: #333a4a;
    --text-primary: #e2e8fd;
    --text-secondary: #8da1b9;
    --accent-color: #64d98a;
    --accent-hover: #52c777;
    --danger-color: #ff6b6b;
    --warning-color: #ffd93d;
    --info-color: #74c0fc;
    
    /* Gradients */
    --bg-gradient: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    --accent-gradient: linear-gradient(135deg, var(--accent-color) 0%, #41c7c7 100%);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

body.nav-open {
    overflow: hidden;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
    padding-top: 4px;
    padding-bottom: 4px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo .logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: calc(var(--spacing-3xl) + 55px) 0 var(--spacing-3xl);
    background: var(--bg-gradient);
}

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


.hero-content {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(var(--spacing-lg), 5vw, var(--spacing-3xl));
    align-items: center;
}

.hero-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-visual {
    position: relative;
}

.hero-title {
    font-size: clamp(2.2rem, 6vw, 3.6rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.highlight {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(1.15rem, 4vw, 1.7rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: clamp(0.98rem, 3.4vw, 1.12rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: min(620px, 90vw);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--primary-bg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* Code Window */
.code-window {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 100%;
}

.window-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
}

.window-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.control {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.control.red { background: #ff5f56; }
.control.yellow { background: #ffbd2e; }
.control.green { background: #27ca3f; }

.window-title {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.window-content {
    padding: var(--spacing-lg);
    overflow-x: auto;
    max-width: 100%;
}

.window-content pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .hero {
        overflow-x: hidden;
    }

    .hero-container {
        max-width: 100vw;
        padding: 0 var(--spacing-sm);
    }

    .hero-content {
        overflow-x: hidden;
    }

    .hero-visual {
        max-width: 100%;
        overflow: hidden;
    }

    .code-window {
        max-width: calc(100vw - 2rem);
        overflow: hidden;
    }

    .window-content {
        padding: var(--spacing-sm);
        max-width: 100%;
        overflow: hidden;
    }

    .window-content pre {
        white-space: pre-wrap;
        word-break: break-word;
        font-size: 0.75rem;
        max-width: 100%;
        overflow-wrap: break-word;
    }

    .hero-title {
        font-size: clamp(1.8rem, 5vw, 2.5rem);
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .hero-subtitle {
        font-size: clamp(1rem, 3.5vw, 1.4rem);
        word-wrap: break-word;
    }

    .hero-description {
        font-size: clamp(0.9rem, 3vw, 1rem);
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
}


.hero-scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.hero-scroll a {
    color: var(--accent-color);
    font-size: 1.5rem;
    text-decoration: none;
}

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

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

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* About Section */
.about {
    background: var(--secondary-bg);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

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

.about-intro {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: var(--spacing-lg);
}

.about-text p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.about-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.about-image {
    display: flex;
    justify-content: center;
}

.image-placeholder {
    width: min(280px, 75vw);
    height: min(280px, 75vw);
    background: var(--card-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--accent-color);
}

.image-placeholder i {
    font-size: 6rem;
    color: var(--accent-color);
}

.about-tech-stack {
    margin-top: var(--spacing-xl);
}

.tech-list {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    color: var(--text-secondary);
}

.tech-list li {
    position: relative;
    padding-left: var(--spacing-lg);
}

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

/* Experience Section */
.experience {
    background: var(--secondary-bg);
}

.timeline-wrapper {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.timeline-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.timeline-item-nav {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.timeline-item-nav::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: var(--transition);
}

.timeline-item-nav:hover {
    color: var(--text-primary);
    transform: translateX(4px);
}

.timeline-item-nav.active {
    color: var(--text-primary);
    border-color: rgba(100, 217, 138, 0.4);
    background: rgba(100, 217, 138, 0.12);
}

.timeline-item-nav.active::before {
    opacity: 1;
}

.timeline-item-title {
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: var(--spacing-xs);
}

.timeline-item-company {
    font-size: 0.9rem;
}

.timeline-details {
    border-radius: 16px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    padding: var(--spacing-2xl);
    position: relative;
    overflow: hidden;
    min-height: 320px;
}

.timeline-details::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(100, 217, 138, 0.16), transparent 45%);
    pointer-events: none;
}

.timeline-role {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.timeline-role h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin: 0;
}

.timeline-role span {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.timeline-description {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

.timeline-points {
    display: grid;
    gap: var(--spacing-sm);
}

.timeline-point {
    position: relative;
    padding-left: var(--spacing-xl);
    color: var(--text-secondary);
}

.timeline-point::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.4rem;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-color);
    box-shadow: 0 0 0 6px rgba(100, 217, 138, 0.15);
}

.timeline-tech {
    margin-top: var(--spacing-xl);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.timeline-tech span {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.02);
}

/* Projects Section - Rafsan Style */

.projects .container-fluid {
    max-width: min(1440px, 96vw);
    padding: 0 var(--spacing-lg);
    margin: 0 auto;
}

.rafsan-project-explorer {
    display: grid;
    grid-template-columns: minmax(320px, 360px) minmax(0, 1fr);
    gap: 0;
    margin-top: var(--spacing-2xl);
    min-height: clamp(620px, 75vh, 820px);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.project-sidebar {
    background: var(--secondary-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: var(--card-bg);
}

.sidebar-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-color);
    margin: 0;
}

.sidebar-subtitle {
    margin: var(--spacing-xs) 0 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.project-tree {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
    position: relative;
}

.tree-loading,
.tree-error {
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.tree-entry {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition-fast);
    color: var(--text-secondary);
}

.tree-entry:hover {
    background: rgba(100, 217, 138, 0.12);
    color: var(--text-primary);
}

.tree-entry.active {
    background: var(--accent-color);
    color: var(--primary-bg);
}

.tree-entry .tree-icon {
    color: inherit;
}

.tree-children {
    margin-left: var(--spacing-lg);
    border-left: 1px solid rgba(126, 126, 255, 0.06);
    padding-left: var(--spacing-sm);
}

.tree-entry.open {
    background: rgba(100, 217, 138, 0.1);
    color: var(--text-primary);
}

.tree-empty {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
}

/* Viewer Updates */
.jupyter-content {
    flex: 1;
    background: #0b101f;
    overflow-y: auto;
}

.viewer-markdown {
    margin: 1.5rem;
    padding: var(--spacing-xl);
    border-radius: 12px;
    background: #0d1117;
    border: 1px solid #1f2b3a;
    color: #e6edf3;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.02);
    line-height: 1.7;
    max-height: calc(100vh - 250px);
    overflow-y: auto;
}

.viewer-markdown h1,
.viewer-markdown h2,
.viewer-markdown h3,
.viewer-markdown h4,
.viewer-markdown h5,
.viewer-markdown h6 {
    color: #e6edf3;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.viewer-markdown a {
    color: var(--accent-color);
    text-decoration: none;
}

.viewer-markdown a:hover {
    text-decoration: underline;
}

.viewer-markdown code {
    background: rgba(22, 27, 34, 0.8);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
}

.viewer-markdown br {
    line-height: 1.7;
}

/* Responsive */
@media (max-width: 1024px) {
    .timeline-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .rafsan-project-explorer {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
    }

    .project-sidebar {
        max-height: 320px;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}

@media (max-width: 768px) {
    .timeline-nav {
        flex-direction: row;
        overflow-x: auto;
        padding-bottom: var(--spacing-sm);
    }

    .timeline-item-nav {
        min-width: 220px;
    }
}

/* Remove deprecated styles */
.other-projects,
.other-projects * {
    display: none !important;
}

/* Timeline Section */
.timeline-container {
    position: relative;
    max-width: 800px;
    margin: var(--spacing-2xl) auto 0;
}

.timeline-line {
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
    padding-left: clamp(60px, 8vw, 100px);
}

.timeline-dot {
    position: absolute;
    left: clamp(18px, 4vw, 28px);
    top: 0;
    width: 16px;
    height: 16px;
    background: var(--accent-color);
    border-radius: 50%;
    border: 3px solid var(--primary-bg);
    z-index: 1;
}

.timeline-content {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    position: relative;
    min-height: 200px;
}

.timeline-content::before {
    content: '';
    position: absolute;
    left: -10px;
    top: 20px;
    width: 0;
    height: 0;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    border-right: 10px solid var(--card-bg);
}

.timeline-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline-date {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.timeline-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Other Projects Section */
.other-projects {
    background: var(--secondary-bg);
}

.project-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    padding: var(--spacing-xl);
}

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

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.project-icon {
    font-size: 2rem;
    color: var(--accent-color);
}

.project-links a {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: var(--transition);
}

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

.project-title-card {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.project-description-card {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
    min-height: 50px;
}

/* Projects Section - Rafsan Style */
.container-fluid {
    max-width: 100%;
    padding: 0 var(--spacing-md);
}

.rafsan-project-explorer {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 0;
    margin-top: var(--spacing-2xl);
    min-height: 700px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

/* Project Sidebar */
.project-sidebar {
    background: var(--secondary-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--card-bg);
}

.sidebar-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-color);
    margin: 0;
}

.project-tree {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
    position: relative;
    max-height: 560px;
}

/* Tree Folder Styles */
.tree-folder {
    margin-bottom: var(--spacing-sm);
}

.folder-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition);
    user-select: none;
}

.folder-header:hover {
    background: rgba(100, 217, 138, 0.1);
}

.tree-folder.expanded .folder-header {
    background: rgba(100, 217, 138, 0.1);
}

.folder-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.folder-content {
    margin-left: var(--spacing-lg);
    margin-top: var(--spacing-xs);
    border-left: 1px solid var(--border-color);
    padding-left: var(--spacing-md);
}

.tree-folder:not(.expanded) .folder-content {
    display: none;
}

/* Tree File Styles */
.tree-file {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
    margin-bottom: 2px;
}

.tree-file:hover {
    background: rgba(100, 217, 138, 0.1);
}

.tree-file.active {
    background: var(--accent-color);
    color: var(--primary-bg);
}

.tree-file.active .tree-icon {
    color: var(--primary-bg);
}

.file-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.tree-file.active .file-name {
    color: var(--primary-bg);
}

.tree-icon {
    width: 16px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Jupyter Viewer */
.jupyter-viewer {
    background: var(--primary-bg);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.jupyter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
}

.file-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.current-file {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.file-type {
    background: var(--accent-color);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.jupyter-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-primary);
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.colab-btn:hover {
    background: #f39c12;
    color: white;
    border-color: #f39c12;
}

.binder-btn:hover {
    background: #e74c3c;
    color: white;
    border-color: #e74c3c;
}

/* Jupyter Content */
.jupyter-content {
    flex: 1;
    background: var(--primary-bg);
    overflow-y: auto;
    height: calc(100% - 60px);
    min-height: 0;
}

.nbviewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
}

.jupyter-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: #f37626;
    font-weight: 600;
}

.jupyter-logo i {
    font-size: 1.2rem;
}

.jupyter-logo small {
    color: var(--text-secondary);
    font-size: 0.7rem;
}

.nbviewer-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.nav-item.active {
    color: #f37626;
    font-weight: 600;
}

.notebook-title {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.notebook-title h2 {
    color: var(--text-primary);
    margin: 0;
    font-size: 1.3rem;
}

/* Notebook Cells */
.notebook-cell {
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
}

.notebook-cells-container {
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    padding: var(--spacing-md);
}

.cell-input {
    display: flex;
    gap: var(--spacing-md);
    padding: 0 var(--spacing-lg);
}

.cell-label {
    font-family: var(--font-mono);
    color: #d73027;
    font-weight: 600;
    font-size: 0.9rem;
    min-width: 60px;
    padding-top: 2px;
}

.cell-code {
    flex: 1;
    background: #0d1117;
    padding: var(--spacing-md);
    border-radius: 6px;
    border: 1px solid #1f2b3a;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.45;
    color: #e6edf3;
    overflow-x: auto;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.02);
}

.code-container .cell-code {
    padding: var(--spacing-lg);
    border-radius: 8px;
}

.code-line {
    white-space: pre;
}

.cell-code .keyword,
.code-line .keyword {
    color: #ff7b72;
    font-weight: 600;
}

.cell-code .string,
.code-line .string {
    color: #a5d6ff;
}

.cell-code .code-comment,
.code-line .code-comment {
    color: #8b949e;
    font-style: italic;
}

.cell-code .number,
.code-line .number {
    color: #ffd700;
}

.code-line {
    margin-bottom: 2px;
}

.code-comment {
    color: #6a737d;
    font-style: italic;
}

.keyword {
    color: #d73027;
    font-weight: 600;
}

.module {
    color: #1f77b4;
}

.class {
    color: #2ca02c;
    font-weight: 600;
}

.variable {
    color: #333;
}

.string {
    color: #d62728;
}

.function {
    color: #ff7f0e;
}

.parameter {
    color: #9467bd;
}

.attribute {
    color: #8c564b;
}

/* Load More Button */
.load-more {
    text-align: center;
    padding: var(--spacing-xl);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin: 0 auto;
}

.btn-outline:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.content-placeholder-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
    overflow-y: auto;
}

.content-placeholder {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    padding: 2rem;
    text-align: center;
    min-height: 200px;
}

/* Old Projects Section (keeping for compatibility) */
.project-explorer {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
    min-height: 600px;
}

/* Project List */
.project-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.project-item {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition);
}

.project-item:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.project-item.active {
    border-color: var(--accent-color);
    background: rgba(100, 217, 138, 0.05);
}

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

.project-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-xs) 0;
}

.project-owner {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.project-stats {
    display: flex;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.project-stats .stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.project-stats i {
    color: var(--accent-color);
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tech-tag {
    background: var(--secondary-bg);
    color: var(--accent-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    font-size: 0.7rem;
    border: 1px solid var(--accent-color);
}

/* Project Viewer */
.project-viewer {
    background: var(--card-bg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.viewer-header {
    background: var(--secondary-bg);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.current-project {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.current-project h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin: 0;
}

.project-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.action-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

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

.action-btn.primary:hover {
    background: var(--accent-hover);
    color: var(--primary-bg);
}

/* File Explorer Container */
.file-explorer-container {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.explorer-tabs {
    display: flex;
    background: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 2px solid transparent;
}

.tab-btn:hover,
.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.tab-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.tab-panel {
    display: none;
    flex: 1;
    flex-direction: column;
}

.tab-panel.active {
    display: flex;
}

/* File Browser */
.file-browser {
    display: grid;
    grid-template-columns: 300px 1fr;
    height: 100%;
    min-height: 400px;
}

.file-tree-container {
    background: var(--secondary-bg);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    max-height: 400px;
}

.file-tree {
    padding: var(--spacing-md);
}

.file-content-container {
    display: flex;
    flex-direction: column;
}

.file-viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.file-path {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.file-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.execute-btn,
.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.execute-btn {
    background: var(--accent-color);
    color: var(--primary-bg);
}

.execute-btn:hover {
    background: var(--accent-hover);
}

.download-btn {
    background: var(--info-color);
    color: var(--primary-bg);
}

.download-btn:hover {
    background: #5fb3f3;
}

/* File Content Scrolling */
.file-content,
.notebook-content,
.code-content-wrapper {
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    padding: var(--spacing-md);
}

.file-content pre,
.notebook-content pre,
.code-content-wrapper pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-x: auto;
}

/* Notebooks Grid */
.notebooks-grid {
    padding: var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    max-height: calc(100% - 100px);
    overflow-y: auto;
}

.notebook-item {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    cursor: pointer;
    transition: var(--transition);
}

.notebook-item:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.notebook-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.notebook-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.notebook-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.notebook-btn {
    flex: 1;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.notebook-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

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

/* README Content */
.readme-content {
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: 400px;
}

/* Project Preview */
.project-preview {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.preview-content {
    text-align: center;
    max-width: 500px;
}

.preview-image {
    margin-bottom: var(--spacing-xl);
}

.preview-image i {
    font-size: 4rem;
    color: var(--accent-color);
}

.preview-content h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.preview-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-xl) 0;
    text-align: left;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.feature-list i {
    color: var(--accent-color);
}

.preview-actions {
    margin-top: var(--spacing-xl);
}


/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.skill-category {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.category-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--accent-color);
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-item {
    background: var(--secondary-bg);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.skill-item:hover {
    background: var(--accent-color);
    color: var(--primary-bg);
    transform: translateY(-2px);
}

/* Contact Section */
.contact {
    background: var(--secondary-bg);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-top: var(--spacing-2xl);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
    width: 30px;
}

.contact-item h4 {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.contact-form {
    background: var(--card-bg);
    padding: var(--spacing-2xl);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: var(--primary-bg);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: var(--spacing-2xl);
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.footer-info h3 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-sm);
}

.footer-info p {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

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

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--card-bg);
    color: var(--text-secondary);
    border-radius: 50%;
    text-decoration: none;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--accent-color);
    color: var(--primary-bg);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 16px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: 4px;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--border-color);
}

.modal-body {
    padding: var(--spacing-xl);
}

.jupyter-options h4 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

.option-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    width: 100%;
}

.option-btn:hover {
    border-color: var(--accent-color);
    background: rgba(100, 217, 138, 0.05);
}

.option-btn i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.option-btn strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.option-btn span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 26, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

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

/* Code Display Styles */
.code-container {
    background: var(--primary-bg);
    border-radius: 8px;
    overflow: hidden;
    margin: var(--spacing-md);
    border: 1px solid var(--border-color);
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: #161b22;
    border-bottom: 1px solid #1f2b3a;
    border-radius: 8px 8px 0 0;
}

.code-language {
    background: rgba(100, 217, 138, 0.15);
    color: var(--accent-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    font-size: 0.75rem;
    text-transform: uppercase;
}

.code-content {
    padding: 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.5;
    overflow-x: auto;
}

.code-content pre {
    margin: 0;
    padding: var(--spacing-lg);
    background: transparent !important;
}

/* Text Content */
.text-content {
    padding: var(--spacing-xl);
    line-height: 1.7;
    color: var(--text-primary);
}

.text-content h1,
.text-content h2,
.text-content h3,
.text-content h4,
.text-content h5,
.text-content h6 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.text-content p {
    margin-bottom: var(--spacing-md);
}

.text-content a {
    color: var(--accent-color);
    text-decoration: none;
}

.text-content a:hover {
    text-decoration: underline;
}

.text-content code {
    background: var(--card-bg);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.text-content pre {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

.text-content blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: var(--spacing-md);
    margin: var(--spacing-md) 0;
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        padding-top: calc(var(--spacing-2xl) + 70px);
        overflow: hidden;
    }

    .hero::before {
        width: clamp(320px, 85vw, 420px);
        height: clamp(320px, 85vw, 420px);
        left: 50%;
        transform: translate(-50%, -10%);
        background: radial-gradient(circle, rgba(100, 217, 138, 0.22), rgba(100, 217, 138, 0));
        border-radius: 50%;
        opacity: 0.25;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--card-bg);
        flex-direction: column;
        justify-content: start;
        align-items: center;
        padding-top: var(--spacing-2xl);
        transition: var(--transition);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .hero-visual {
        order: -1;
    }

    .hero-text {
        order: 1;
        text-align: center;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
        max-width: min(90vw, 560px);
    }

    .hero-buttons {
        justify-content: center;
        width: 100%;
    }

    .hero-scroll {
        display: none;
    }

    .hero::before {
        width: clamp(320px, 85vw, 420px);
        height: clamp(320px, 85vw, 420px);
        left: 50%;
        right: auto;
        transform: translate(-50%, -10%);
        background: radial-gradient(circle, rgba(100, 217, 138, 0.22), rgba(100, 217, 138, 0));
        border-radius: 50%;
        opacity: 0.25;
    }

    .hero-scroll {
        display: none;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
        align-items: center;
    }

    .about-stats {
        justify-content: center;
    }

    .about-text {
        text-align: center;
        align-items: center;
        gap: var(--spacing-md);
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }

    .project-explorer {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .project-list {
        order: 2;
        max-height: 300px;
        overflow-y: auto;
    }

    .project-viewer {
        order: 1;
    }

    .current-project {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .project-actions {
        justify-content: center;
    }

    .file-browser {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
    }

    .file-tree-container {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        max-height: 200px;
    }

    /* Experience Section Mobile */
    .experience-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .job-list {
        order: 2;
        flex-direction: row;
        overflow-x: auto;
        gap: var(--spacing-sm);
        padding-bottom: var(--spacing-sm);
    }

    .job-tab {
        min-width: 150px;
        text-align: center;
        flex-shrink: 0;
    }

    .job-content {
        order: 1;
    }

    /* Timeline Section Mobile */
    .timeline-container {
        margin-left: var(--spacing-md);
    }

    .timeline-line {
        left: 15px;
    }

    .timeline-dot {
        left: 7px;
    }

    .timeline-item {
        padding-left: 50px;
    }

    /* Rafsan Projects Mobile */
    .rafsan-project-explorer {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
        height: auto;
        max-height: 80vh;
    }

    .project-sidebar {
        order: 2;
        max-height: min(45vh, 360px);
        border-right: none;
        border-top: 1px solid var(--border-color);
        overflow-y: auto;
    }

    .jupyter-viewer {
        order: 1;
        min-height: 360px;
        max-height: 55vh;
        overflow: hidden;
    }

    .jupyter-content {
        height: 100%;
        overflow-y: auto;
    }

    .file-content,
    .notebook-content,
    .code-content-wrapper {
        max-height: 50vh;
    }

    .viewer-markdown {
        max-height: 50vh;
    }

    .jupyter-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    .jupyter-actions {
        justify-content: center;
    }

    .nbviewer-nav {
        display: none;
    }

    .hero-buttons {
        justify-content: center;
    }

    .input-group {
        flex-direction: column;
    }

    .github-input {
        padding: var(--spacing-lg);
        text-align: center;
    }

    .input-icon {
        display: none;
    }

    .load-btn {
        justify-content: center;
    }
}

@media (min-width: 1400px) {
    .hero-container,
    .nav-container,
    .container {
        max-width: 1180px;
    }

    .hero-content {
        grid-template-columns: 1.05fr 0.95fr;
    }

    .rafsan-project-explorer {
        grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.1fr);
        min-height: 760px;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* Prism.js Custom Theme */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
    color: var(--text-secondary);
}

.token.punctuation {
    color: var(--text-primary);
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
    color: #ff6b6b;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
    color: var(--accent-color);
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
    color: #ffd93d;
}

.token.atrule,
.token.attr-value,
.token.keyword {
    color: #74c0fc;
}

.token.function,
.token.class-name {
    color: #ff9f43;
}

.token.regex,
.token.important,
.token.variable {
    color: #ff6b6b;
}

.cell-code .function,
.code-line .function {
    color: #79c0ff;
}

.cell-code .boolean,
.code-line .boolean {
    color: #f2cc60;
}

.cell-code .operator,
.code-line .operator {
    color: #ffab70;
}

.cell-code .identifier,
.code-line .identifier {
    color: #d2a8ff;
}

/* Technical Skills Section */
#skills {
    background: var(--secondary-bg);
}

.skills-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.skills-column h3 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-sm);
}

.skills-column ul {
    list-style: none;
    padding: 0;
    color: var(--text-secondary);
    display: grid;
    gap: 6px;
}

.skills-column li::before {
    content: '▹';
    margin-right: 8px;
    color: var(--accent-color);
}

/* Education Section */
.education {
    background: var(--primary-bg);
}

.education-list {
    display: grid;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.education-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--card-bg);
}

.education-item h3 {
    color: var(--text-primary);
}

.education-item p {
    color: var(--text-secondary);
    margin: 0;
}

.education-meta {
    display: flex;
    gap: var(--spacing-lg);
    color: var(--accent-color);
    font-size: 0.85rem;
}

/* Research & Teaching */
.research {
    background: var(--secondary-bg);
}

.research-cards {
    display: grid;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.research-card {
    padding: var(--spacing-xl);
    border-radius: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.research-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.research-card ul {
    list-style: none;
    padding-left: var(--spacing-lg);
    color: var(--text-secondary);
}

.research-card li {
    position: relative;
    margin-bottom: 6px;
}

.research-card li::before {
    content: '•';
    position: absolute;
    left: -14px;
    color: var(--accent-color);
}

/* Publications */
.publications {
    background: var(--primary-bg);
}

.publication-list {
    display: grid;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.publication-group h3 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-sm);
}

.publication-group ul {
    list-style: none;
    padding: 0;
    color: var(--text-secondary);
    display: grid;
    gap: 8px;
}

.publication-group li {
    display: block;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.7;
}

.publication-link {
    margin-left: var(--spacing-sm);
    color: #ff6b6b;
    font-weight: 600;
    text-decoration: none;
}

.publication-link:hover {
    text-decoration: underline;
}

.publication-meta {
    display: inline-block;
    margin-top: var(--spacing-xs);
    color: var(--accent-color);
    font-size: 0.85rem;
}

/* Extracurricular */
.extra {
    background: var(--secondary-bg);
}

.extra-grid {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    margin-top: var(--spacing-2xl);
    color: var(--text-secondary);
}

.extra-grid h3 {
    color: var(--text-primary);
}

/* References */
.references {
    background: var(--primary-bg);
}

.references-grid {
    display: grid;
    gap: var(--spacing-xl);
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    margin-top: var(--spacing-2xl);
}

.reference-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-xl);
    background: var(--card-bg);
    color: var(--text-secondary);
}

.reference-card h3 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-sm);
}

.reference-card a {
    color: var(--accent-color);
    text-decoration: none;
}

.reference-card a:hover {
    text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .education-item {
        padding: var(--spacing-lg);
    }

    .education-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}

/* Certifications Section */
.certifications {
    background: var(--primary-bg);
}

.certifications-grid {
    display: grid;
    gap: var(--spacing-xl);
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    margin-top: var(--spacing-2xl);
}

.cert-card {
    padding: var(--spacing-xl);
    border-radius: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

/* Contact Form Status Messages */
.status-message {
    margin-top: var(--spacing-md);
    text-align: center;
    padding: var(--spacing-md);
    border-radius: 8px;
    transition: var(--transition);
}

.status-message.hidden {
    display: none;
}

.status-message p.success {
    color: var(--accent-color);
    background: rgba(100, 217, 138, 0.1);
    border: 1px solid rgba(100, 217, 138, 0.3);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: 0;
}

.status-message p.error {
    color: var(--danger-color);
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: 0;
}

.status-message p.sending {
    color: var(--info-color);
    background: rgba(116, 192, 252, 0.1);
    border: 1px solid rgba(116, 192, 252, 0.3);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: 0;
}