/* ========================================
   DEVELOPER PORTFOLIO - MAIN STYLESHEET
   Modern, responsive design with gradient theme
   ======================================== */

/* === CSS VARIABLES === */
:root {
    /* Color Palette - Purple/Blue Gradient Theme */
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    /* Neutral Colors */
    --dark-bg: #0f0f23;
    --dark-secondary: #1a1a2e;
    --dark-card: #16213e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b5;
    --text-muted: #6c6c80;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* === RESET & BASE STYLES === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

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

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

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.page-header {
    padding: 8rem var(--spacing-md) 4rem;
    text-align: center;
    background: linear-gradient(180deg, var(--dark-secondary) 0%, var(--dark-bg) 100%);
}

.page-header h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* === NAVIGATION BAR === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(15, 15, 35, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-sm) 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--text-primary);
    background: rgba(102, 126, 234, 0.1);
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition-fast);
    border-radius: 2px;
}

/* === 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;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-1);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-gradient {
    background: var(--gradient-1);
    color: var(--text-primary);
    box-shadow: var(--shadow-glow);
}

.btn-gradient:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.5);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* === HERO SECTION === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, var(--dark-bg) 0%, var(--dark-secondary) 100%);
    position: relative;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-bio {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.6s both;
}

/* === SKILLS SECTION === */
.skills {
    padding: var(--spacing-xl) 0;
    background: var(--dark-secondary);
}

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

.skill-card {
    background: var(--dark-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.skill-icon {
    font-size: 3rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

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

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

/* === FEATURED PROJECT SECTION === */
.featured-project {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

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

.featured-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.featured-badge {
    display: inline-block;
    background: var(--gradient-1);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.featured-text h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.featured-highlights {
    list-style: none;
    margin: var(--spacing-md) 0;
}

.featured-highlights li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

.featured-highlights i {
    color: var(--primary-color);
}

/* === STATS SECTION === */
.stats {
    padding: var(--spacing-xl) 0;
    background: var(--dark-secondary);
}

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

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
}

.stat-number {
    font-size: 3rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* === PROJECTS PAGE === */
.projects-section {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

.project-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background: var(--dark-card);
    border: 2px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--gradient-1);
    color: var(--text-primary);
    border-color: transparent;
}

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

.project-card {
    background: var(--dark-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.project-image {
    position: relative;
    overflow: hidden;
    height: 250px;
}

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

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    font-size: 2rem;
    color: var(--text-primary);
    padding: var(--spacing-sm);
    background: var(--gradient-1);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-content {
    padding: var(--spacing-md);
}

.project-tag {
    display: inline-block;
    background: var(--gradient-1);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

.project-content h3 {
    margin-bottom: var(--spacing-sm);
}

.project-tech {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin: var(--spacing-sm) 0;
}

.tech-badge {
    background: rgba(102, 126, 234, 0.2);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.project-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

/* === STUDY MATERIALS PAGE === */
.study-section {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

.study-category {
    margin-bottom: var(--spacing-xl);
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
}

.category-icon {
    font-size: 2.5rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.material-card {
    background: var(--dark-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.material-icon {
    font-size: 3rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.material-meta {
    display: flex;
    gap: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.material-meta span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.cta-section {
    padding: var(--spacing-xl) 0;
    background: var(--dark-secondary);
    text-align: center;
}

.cta-content h2 {
    margin-bottom: var(--spacing-sm);
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
}

/* === COMET PROMOTION PAGE === */
.comet-page {
    background: var(--dark-bg);
}

.navbar-transparent {
    background-color: transparent;
}

.comet-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-xl) 0;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
}

.comet-hero-content {
    text-align: center;
    position: relative;
    z-index: 2;
}

.comet-logo img {
    width: 150px;
    height: 150px;
    margin-bottom: var(--spacing-md);
    animation: float 3s ease-in-out infinite;
}

.comet-title {
    font-size: 5rem;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 0 30px rgba(0, 0, 0, 0.3);
}

.comet-tagline {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.comet-description {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
}

.comet-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.comet-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.comet-stats .stat {
    text-align: center;
}

.comet-stats strong {
    display: block;
    font-size: 2rem;
    margin-bottom: 0.25rem;
}

.comet-stats span {
    color: rgba(255, 255, 255, 0.8);
}

.comet-features {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.feature-item {
    background: var(--dark-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 3rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.comet-screenshots {
    padding: var(--spacing-xl) 0;
    background: var(--dark-secondary);
}

.screenshots-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

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

.screenshot-item img {
    width: 100%;
    max-width: 350px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
}

.screenshot-item img:hover {
    transform: scale(1.05);
}

.screenshot-caption {
    margin-top: var(--spacing-sm);
    color: var(--text-secondary);
}

.comet-tech {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

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

.tech-card {
    background: var(--dark-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-normal);
}

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

.tech-card i {
    font-size: 3rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.comet-highlights {
    padding: var(--spacing-xl) 0;
    background: var(--dark-secondary);
}

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

.highlight-row.reverse {
    direction: rtl;
}

.highlight-row.reverse > * {
    direction: ltr;
}

.highlight-text h2 {
    margin-bottom: var(--spacing-md);
}

.feature-list {
    list-style: none;
    margin-top: var(--spacing-md);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

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

.highlight-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.comet-testimonials {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.testimonial-card {
    background: var(--dark-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.testimonial-stars {
    color: #ffd700;
    margin-bottom: var(--spacing-sm);
}

.testimonial-author {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.testimonial-author strong {
    display: block;
    color: var(--text-primary);
}

.testimonial-author span {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.comet-download {
    padding: var(--spacing-xl) 0;
    background: var(--dark-secondary);
    text-align: center;
}

.download-content h2 {
    margin-bottom: var(--spacing-sm);
}

.download-options {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--dark-card);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.download-btn:hover {
    background: var(--gradient-1);
    border-color: transparent;
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.download-btn i {
    font-size: 2rem;
}

.download-btn small {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.download-btn strong {
    display: block;
    font-size: 1.1rem;
}

.version-info {
    margin-top: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.comet-credits {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
    text-align: center;
}

.credits-content h3 {
    margin-bottom: var(--spacing-sm);
}

.credits-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

/* === CONTACT PAGE === */
.contact-section {
    padding: var(--spacing-xl) 0;
    background: var(--dark-bg);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-xl);
}

.contact-form-container {
    background: var(--dark-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
}

.contact-form-container h2 {
    margin-bottom: var(--spacing-md);
}

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

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background: var(--dark-bg);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-success {
    display: none;
    background: rgba(76, 175, 80, 0.2);
    border: 2px solid #4CAF50;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    margin-top: var(--spacing-md);
}

.form-success.show {
    display: block;
}

.form-success i {
    font-size: 3rem;
    color: #4CAF50;
    margin-bottom: var(--spacing-sm);
}

.contact-info {
    background: var(--dark-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
}

.contact-info h2 {
    margin-bottom: var(--spacing-sm);
}

.contact-items {
    margin: var(--spacing-md) 0;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-1);
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-details h4 {
    margin-bottom: 0.25rem;
    font-size: 1rem;
}

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

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

.contact-social {
    margin-top: var(--spacing-lg);
}

.contact-social h3 {
    margin-bottom: var(--spacing-md);
}

.social-links-large {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.social-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem;
    background: var(--dark-bg);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.social-btn:hover {
    background: var(--gradient-1);
    border-color: transparent;
    transform: translateY(-2px);
}

.social-btn i {
    font-size: 1.5rem;
}

.faq-section {
    padding: var(--spacing-xl) 0;
    background: var(--dark-secondary);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.faq-item {
    background: var(--dark-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.faq-question {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.faq-question i {
    color: var(--primary-color);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.faq-question h3 {
    font-size: 1.1rem;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* === FOOTER === */
.footer {
    background: var(--dark-secondary);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-sm);
}

.footer-section h3 {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

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

.footer-links a {
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark-card);
    border-radius: var(--radius-sm);
    font-size: 1.2rem;
    transition: var(--transition-fast);
}

.social-links a:hover {
    background: var(--gradient-1);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 768px) {
    /* Typography */
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
    
    /* Navigation */
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--dark-secondary);
        width: 100%;
        padding: var(--spacing-md);
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    /* Hero Section */
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    /* Featured Project */
    .featured-content {
        grid-template-columns: 1fr;
    }
    
    /* Projects */
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    /* Contact */
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    /* Comet Page */
    .comet-title {
        font-size: 3rem;
    }
    
    .comet-tagline {
        font-size: 1.5rem;
    }
    
    .comet-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .highlight-row,
    .highlight-row.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }
    
    .download-options {
        flex-direction: column;
    }
    
    .social-links-large {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .page-header {
        padding: 6rem var(--spacing-sm) 3rem;
    }
    
    .skills-grid,
    .materials-grid,
    .features-grid,
    .tech-grid {
        grid-template-columns: 1fr;
    }
}

/* === PRINT STYLES === */
@media print {
    .navbar,
    .footer,
    .btn {
        display: none;
    }
}