/* ========================================================================
   Portfolio Website - Modern Design
   Author: Hakan Çetin
   ======================================================================== */

/* ========================================================================
   CSS Custom Properties (Variables)
   ======================================================================== */
:root {
    /* Colors - Light Theme */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #ec4899;
    --accent-color: #14b8a6;
    
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    
    --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);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-width: 1200px;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
}

/* Dark Theme */
[data-theme="dark"] {
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    
    --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, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7);
}

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

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

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: var(--section-padding);
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ========================================================================
   Navigation
   ======================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
    background-color: rgba(17, 24, 39, 0.8);
}

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

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.nav-logo:hover {
    transform: scale(1.05);
}

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

.nav-list {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

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

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

/* ========================================================================
   Theme Toggle
   ======================================================================== */
.theme-toggle {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    z-index: 999;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: var(--shadow-xl);
}

/* ========================================================================
   Hero Section
   ======================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-bg-image {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0.1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.1) 0%, 
        rgba(236, 72, 153, 0.1) 100%);
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text {
    animation: fadeInUp 1s ease-out;
}

.greeting {
    font-size: 1.5rem;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.5rem;
}

.name {
    font-size: 4rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}

.hero-subtitle {
    font-size: 2rem;
    color: var(--text-secondary);
    min-height: 60px;
    margin: 1.5rem 0;
}

.typing-text {
    font-family: var(--font-mono);
    color: var(--primary-color);
    font-weight: 600;
}

.typing-text::after {
    content: '|';
    animation: blink 1s infinite;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 1.5rem 0 2rem;
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

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

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

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.hero-social {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.hero-social a {
    width: 45px;
    height: 45px;
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 1.25rem;
    transition: all var(--transition-base);
}

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

.hero-image {
    animation: fadeInRight 1s ease-out;
}

.profile-card {
    position: relative;
    max-width: 400px;
    margin: 0 auto;
}

.profile-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 4px solid var(--bg-primary);
}

.profile-badge {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .profile-badge {
    background: rgba(31, 41, 55, 0.95);
}

.profile-badge i {
    color: #10b981;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-image {
    position: relative;
}

.workspace-img {
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 2rem;
}

.stat-item {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 2rem 0;
}

.highlight-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.highlight-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 0.25rem;
}

.highlight-item h4 {
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.highlight-item p {
    margin: 0;
    font-size: 0.875rem;
}

.about-links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* ========================================================================
   Skills Section
   ======================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.skill-category {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.category-header i {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.category-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skill-item {
    transition: transform var(--transition-fast);
}

.skill-item:hover {
    transform: translateX(5px);
}

.skill-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.skill-icon {
    width: 28px;
    height: 28px;
}

.skill-name {
    flex: 1;
    font-weight: 600;
    color: var(--text-primary);
}

.skill-percentage {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.skill-bar {
    height: 8px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width 1s ease-out;
}

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

.project-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.filter-btn {
    padding: 0.625rem 1.5rem;
    border-radius: var(--radius-full);
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    background: var(--bg-secondary);
}

.project-content {
    padding: 1.5rem;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.project-links {
    display: flex;
    gap: 0.5rem;
}

.project-link {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.project-tag {
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
}

.project-stats {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.project-stat {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.view-all-projects {
    text-align: center;
    margin-top: 3rem;
}

/* ========================================================================
   Experience Section
   ======================================================================== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    display: grid;
    grid-template-columns: 1fr 60px 1fr;
    gap: 2rem;
}

.timeline-item:nth-child(even) .timeline-content {
    grid-column: 1;
    grid-row: 1;
}

.timeline-item:nth-child(even) .timeline-date {
    grid-column: 3;
    grid-row: 1;
    text-align: left;
}

.timeline-dot {
    grid-column: 2;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background: var(--primary-color);
    position: relative;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 0 4px var(--bg-primary), 0 0 0 6px var(--primary-color);
    z-index: 1;
}

.timeline-date {
    color: var(--text-secondary);
    font-weight: 600;
    text-align: right;
}

.timeline-content {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.timeline-content h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.timeline-content h4 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.timeline-tags span {
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
}

/* ========================================================================
   GitHub Stats Section
   ======================================================================== */
.github-section {
    background: var(--bg-secondary);
}

.github-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.github-stat-card {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

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

.github-stat-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.github-stat-card h3 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.github-stat-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.github-languages,
.recent-repos {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.github-languages h3,
.recent-repos h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.language-bars {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.language-bar {
}

.language-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.language-name {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.language-dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
}

.language-percent {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.language-progress {
    height: 10px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.language-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 1s ease-out;
}

.repos-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.repo-item {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-fast);
}

.repo-item:hover {
    transform: translateX(5px);
}

.repo-name {
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 1.125rem;
}

.repo-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0.5rem 0;
}

.repo-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
}

/* ========================================================================
   Contact Section
   ======================================================================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
}

.contact-info h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.contact-info > p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
}

.contact-item i {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    color: var(--primary-color);
    border-radius: var(--radius-lg);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact-item h4 {
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

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

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

.social-links {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.social-link {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-lg);
    font-size: 1.25rem;
    transition: all var(--transition-base);
}

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

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    color: var(--text-primary);
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

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

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

/* ========================================================================
   Footer
   ======================================================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

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

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

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

.footer-column a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-bottom p {
    margin: 0.25rem 0;
}

.footer-bottom i {
    color: #ef4444;
}

/* ========================================================================
   Back to Top Button
   ======================================================================== */
.back-to-top {
    position: fixed;
    bottom: 6rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 998;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

/* ========================================================================
   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%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

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

/* ========================================================================
   Responsive Design
   ======================================================================== */
@media (max-width: 1024px) {
    .hero-content,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .hero-image {
        order: -1;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .github-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        grid-template-columns: 60px 1fr;
    }
    
    .timeline-item:nth-child(even) .timeline-content {
        grid-column: 2;
    }
    
    .timeline-item:nth-child(even) .timeline-date {
        grid-column: 2;
        text-align: left;
    }
    
    .timeline-dot {
        left: 30px;
    }
    
    .timeline-date {
        grid-column: 2;
        text-align: left !important;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: var(--bg-primary);
        transition: left var(--transition-base);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-list {
        flex-direction: column;
        padding: 2rem;
    }
    
    .hamburger {
        display: flex;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .name {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .github-stats-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}