/* ============================================
   CSS Variables for Easy Theme Customization
   ============================================ */
:root {
    /* Primary Colors */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    
    /* Accent Colors */
    --accent-color: #8b5cf6;
    --accent-light: #a78bfa;
    
    /* Neutral Colors */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    
    /* Border & Shadow */
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

/* ============================================
   Dark Theme Variables
   ============================================ */
[data-theme="dark"] {
    /* Primary Colors - Slightly lighter for dark mode */
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    
    /* Accent Colors */
    --accent-color: #a78bfa;
    --accent-light: #c4b5fd;
    
    /* Neutral Colors */
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    
    /* Background Colors */
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    
    /* Border & Shadow */
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

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

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

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

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

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

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

a:hover {
    color: var(--primary-dark);
}

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

/* ============================================
   Layout & Container
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-size: 2.5rem;
    position: relative;
    padding-bottom: var(--spacing-md);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-sm);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

/* ============================================
   Navigation Bar
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
    background-color: rgba(17, 24, 39, 0.95);
}

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

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem var(--spacing-lg);
    gap: var(--spacing-md);
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: color var(--transition-base);
    white-space: nowrap;
}

.nav-brand:hover {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-left: auto;
}

.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1rem;
    font-size: 1.125rem;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: rotate(20deg) scale(1.05);
}

.theme-toggle:active {
    transform: rotate(20deg) scale(0.95);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
}

[data-theme="dark"] .nav-link:hover,
[data-theme="dark"] .nav-link.active {
    background-color: rgba(59, 130, 246, 0.2);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
}

/* ============================================
   Sub-Navigation (Home page only)
   ============================================ */
.sub-navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    position: sticky;
    top: 70px;
    z-index: 900;
    transition: all var(--transition-base);
}

.sub-nav-menu {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
    margin: 0;
    padding: 0;
}

.sub-nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    position: relative;
}

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

.sub-nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background-color: var(--primary-color);
    transition: transform var(--transition-base);
}

.sub-nav-link:hover::after,
.sub-nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
    background: linear-gradient(135deg, #f9fafb 0%, #e0e7ff 100%);
}

.hero-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.hero-content {
    display: grid;
    grid-template-columns: 315px 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

.hero-left {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.hero-intro {
    animation: fadeInUp 0.8s ease;
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.hero-right {
    animation: fadeInRight 0.8s ease;
}

.hero-about {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    height: 100%;
}

.hero-about h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.hero-about p {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-about p:last-of-type {
    margin-bottom: var(--spacing-lg);
}

.hero-timeline {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.hero-timeline h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.timeline-horizontal {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    width: 100%;
}

@media (max-width: 1024px) {
    .timeline-horizontal {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .timeline-horizontal {
        grid-template-columns: repeat(2, 1fr);
    }
}

.timeline-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    text-align: center;
}

.timeline-item:hover {
    background-color: var(--bg-secondary);
    transform: translateY(-2px);
}

.timeline-item.active {
    background-color: rgba(37, 99, 235, 0.1);
}

.timeline-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 50%;
    font-size: 1rem;
    flex-shrink: 0;
}

.timeline-details {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.timeline-details strong {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.timeline-details span {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

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

.greeting {
    display: block;
    color: var(--primary-color);
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.name {
    display: block;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

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

.hero-info p {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.hero-info p:last-child {
    margin-bottom: 0;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

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

.hero-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.hero-image {
    animation: fadeInDown 0.8s ease;
}

.image-wrapper {
    position: relative;
    width: 100%;
    max-width: 315px;
}

.image-wrapper img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 2;
    display: block;
}

.image-backdrop {
    position: absolute;
    top: 20px;
    right: -20px;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-xl);
    z-index: 1;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-md);
    color: var(--primary-color);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* ============================================
   About Section
   ============================================ */
.about-section {
    background-color: var(--bg-primary);
}

.about-content {
    display: grid;
    gap: var(--spacing-xl);
}

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

.about-text p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.about-highlights {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.highlight-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.highlight-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.highlight-item i {
    font-size: 2rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.highlight-item h4 {
    margin-bottom: var(--spacing-xs);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-lg);
    color: white;
    transition: transform var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

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

.experience-content {
    display: grid;
    gap: var(--spacing-xl);
}

.experience-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.experience-header {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

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

.experience-info h3 {
    margin-bottom: var(--spacing-xs);
}

.experience-info h4 {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.experience-period {
    color: var(--text-light);
    font-size: 0.95rem;
}

.experience-description p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.experience-achievements {
    list-style: none;
    display: grid;
    gap: var(--spacing-sm);
}

.experience-achievements li {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-base);
}

.experience-achievements li:hover {
    background-color: var(--bg-secondary);
}

.experience-achievements i {
    color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 2px;
}

/* ============================================
   Horizontal Timeline (About Section)
   ============================================ */
.horizontal-timeline {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-xl) 0;
    overflow: hidden;
}

.timeline-heading {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--primary-color);
    font-size: 1.75rem;
}

.timeline-track {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: var(--spacing-xl) var(--spacing-md);
    gap: var(--spacing-sm);
}

.timeline-track::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 10%;
    right: 10%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    z-index: 0;
    border-radius: var(--radius-sm);
}

.timeline-step {
    position: relative;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    z-index: 1;
}

.timeline-step-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 4px solid var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    z-index: 2;
}

.timeline-step.active .timeline-step-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    animation: pulse 2s infinite;
    border-color: var(--accent-color);
}

.timeline-step:hover .timeline-step-icon {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.timeline-step-content {
    max-width: 140px;
}

.timeline-step-content h4 {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.3;
}

.timeline-year {
    display: block;
    font-size: 0.8rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.timeline-step-content p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

/* ============================================
   Skills Section
   ============================================ */
.skills-section {
    background-color: var(--bg-secondary);
}

.skills-content {
    display: grid;
    gap: var(--spacing-lg);
}

.skill-category {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.category-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.category-header i {
    font-size: 2rem;
    color: var(--primary-color);
}

.category-header h3 {
    color: var(--text-primary);
}

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

.skill-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.skill-tag:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.skill-tag.expert {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

.skill-tag.advanced {
    border-color: var(--accent-color);
    background-color: rgba(139, 92, 246, 0.1);
    color: var(--accent-color);
}

.skill-tag.intermediate {
    border-color: var(--text-light);
}

/* ============================================
   Projects Section
   ============================================ */
.projects-section {
    background-color: var(--bg-primary);
}

.current-work {
    margin-bottom: var(--spacing-xl);
}

.current-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5rem 1rem;
    background-color: #dcfce7;
    color: #166534;
    border-radius: var(--radius-md);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.pulse {
    animation: pulse 2s infinite;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.project-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 2px solid var(--border-color);
}

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

.project-card.featured {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(139, 92, 246, 0.05));
}

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

.project-header h3 {
    color: var(--primary-color);
    flex: 1;
}

.project-status {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
}

.project-status.completed {
    background-color: #dcfce7;
    color: #166534;
}

.project-status.current {
    background-color: #dbeafe;
    color: #1e40af;
}

.project-description {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

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

.tech-tag {
    padding: 0.25rem 0.75rem;
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.project-impact {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background-color: rgba(139, 92, 246, 0.1);
    border-radius: var(--radius-sm);
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.project-expand {
    width: 100%;
    padding: var(--spacing-sm);
    background-color: var(--bg-secondary);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.project-expand:hover {
    background-color: var(--primary-color);
    color: white;
}

.project-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
    margin-top: var(--spacing-md);
}

.project-details.expanded {
    max-height: 1000px;
}

.project-details h4 {
    color: var(--primary-color);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.project-details ul {
    list-style: none;
    padding-left: 0;
}

.project-details li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
}

.project-details li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

.projects-cta {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
}

.projects-cta p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

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

.contact-content {
    display: grid;
    gap: var(--spacing-xl);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.contact-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

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

.contact-card h3 {
    margin-bottom: var(--spacing-xs);
}

.contact-card p {
    margin-bottom: var(--spacing-sm);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary-color);
    font-weight: 600;
    transition: all var(--transition-base);
    word-break: break-all;
}

.contact-link:hover {
    gap: var(--spacing-sm);
}

.contact-text {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
}

.cv-download {
    margin-top: var(--spacing-lg);
}

.cv-card {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(139, 92, 246, 0.1));
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 2px solid var(--primary-color);
}

.cv-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.cv-card h3 {
    margin-bottom: var(--spacing-sm);
}

.cv-card p {
    margin-bottom: var(--spacing-lg);
    font-size: 1.125rem;
}

.cv-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

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

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

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

.footer-info p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-md);
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: all var(--transition-base);
}

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

.footer-links h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: white;
}

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

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

/* ============================================
   Scroll to Top Button
   ============================================ */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

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

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

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-image {
        order: -1;
    }
    
    .image-wrapper {
        max-width: 300px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    /* Horizontal Timeline - Convert to Vertical on Mobile */
    .timeline-track {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-lg);
        padding: var(--spacing-md);
    }
    
    .timeline-track::before {
        top: 0;
        left: 30px;
        right: auto;
        bottom: 0;
        width: 4px;
        height: 100%;
        background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    }
    
    .timeline-step {
        flex-direction: row;
        align-items: center;
        text-align: left;
        width: 100%;
    }
    
    .timeline-step-icon {
        margin-bottom: 0;
        margin-right: var(--spacing-md);
        flex-shrink: 0;
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .timeline-step-content {
        flex: 1;
        max-width: none;
    }
    
    .timeline-step-content h4 {
        font-size: 0.95rem;
    }
    
    .timeline-year {
        font-size: 0.75rem;
    }
    
    .timeline-step-content p {
        font-size: 0.8rem;
    }
    
    /* Other Mobile Styles */
    
    .nav-container {
        position: relative;
        gap: var(--spacing-sm);
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background-color: var(--bg-primary);
        width: 100%;
        text-align: center;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg);
        z-index: 999;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-actions {
        margin-left: auto;
    }
    
    .theme-toggle {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        min-height: auto;
        padding: 100px 0 var(--spacing-xl);
    }
    
    .name {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cv-buttons {
        flex-direction: column;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-social {
        justify-content: center;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .skill-tags {
        justify-content: center;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .navbar,
    .scroll-top,
    .scroll-indicator,
    .hero-buttons,
    .hero-social,
    .footer {
        display: none;
    }
    
    body {
        font-size: 12pt;
    }
    
    .section {
        page-break-inside: avoid;
    }
}