/* Modern Portfolio CSS - Enhanced with 2025 Design Trends */

/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #06d6a0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-hover: rgba(255, 255, 255, 0.08);
    
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --border-primary: rgba(255, 255, 255, 0.1);
    --border-secondary: rgba(255, 255, 255, 0.05);
    
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --gradient-accent: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    --gradient-bg: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.5);
    
    --blur-sm: 8px;
    --blur-md: 12px;
    --blur-lg: 16px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --container-max: 1200px;
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --border-radius-lg: 24px;
}

/* Reset & Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    cursor: none;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Preloader */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.preloader-content {
    text-align: center;
}

.logo-preloader {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 800;
    color: white;
    margin: 0 auto 2rem;
    animation: pulse-logo 2s ease-in-out infinite;
}

@keyframes pulse-logo {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.loading-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-weight: 500;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: var(--bg-glass);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.loading-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    animation: loading 2s ease-in-out infinite;
}

@keyframes loading {
    0% { width: 0%; }
    50% { width: 100%; }
    100% { width: 0%; }
}

/* Custom Cursor */
.cursor {
    position: fixed;
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    transition: transform var(--transition-fast);
    box-shadow: 0 0 20px var(--primary-color);
    mix-blend-mode: difference;
}

.cursor-follower {
    position: fixed;
    width: 30px;
    height: 30px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9998;
    transition: all var(--transition-normal);
    opacity: 0.6;
}

/* Scroll Indicator */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--gradient-primary);
    z-index: 9999;
    transition: width var(--transition-fast);
}

/* Navigation */
.navbar {
    background: rgba(15, 15, 35, 0.8) !important;
    backdrop-filter: blur(var(--blur-lg));
    border-bottom: 1px solid var(--border-secondary);
    transition: all var(--transition-normal);
    padding: 1rem 0;
}

.navbar.scrolled {
    background: rgba(15, 15, 35, 0.95) !important;
    backdrop-filter: blur(var(--blur-lg));
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary) !important;
    text-decoration: none;
}

.brand-logo {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.2rem;
    color: white;
}

.brand-text {
    font-family: var(--font-mono);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
    width: 40px;
    height: 40px;
    position: relative;
    background: transparent;
}

.navbar-toggler span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    margin: 4px 0;
    transition: all var(--transition-normal);
    border-radius: 1px;
}

.navbar-toggler[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.navbar-toggler[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.navbar-toggler[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.navbar-nav .nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem !important;
    margin: 0 0.25rem;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.navbar-nav .nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--bg-glass);
    transition: left var(--transition-normal);
    z-index: -1;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--text-primary) !important;
    background: var(--bg-glass);
}

.navbar-nav .nav-link:hover::before {
    left: 0;
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--gradient-bg);
}

#three-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    padding: 2rem 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: 50px;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-color);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-badge i {
    animation: pulse 2s ease-in-out infinite;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.title-line {
    display: block;
    font-size: 0.4em;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.title-name {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.title-role {
    display: block;
    font-size: 0.5em;
    font-weight: 500;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    animation: fadeInUp 0.8s ease 0.8s both;
}

.typewriter {
    overflow: hidden;
    border-right: 2px solid var(--primary-color);
    white-space: nowrap;
    animation: typing 3s steps(25) 1s both, blink 0.75s step-end infinite 1s;
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes blink {
    from, to { border-color: transparent; }
    50% { border-color: var(--primary-color); }
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 1s both;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.8s ease 1.2s both;
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 0.25rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 1.4s both;
}

.hero-visual {
    position: relative;
    z-index: 3;
}

/* Bento Grid */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 80px);
    gap: 1rem;
    max-width: 400px;
    margin: 0 auto;
}

.bento-item {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.bento-item.large {
    grid-column: span 2;
    grid-row: span 2;
}

.bento-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-glass-hover);
}

.bento-content {
    text-align: center;
    padding: 1rem;
}

.bento-content i {
    font-size: 2rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.bento-item.large .bento-content i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.bento-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.bento-content h4 {
    font-size: 0.9rem;
    font-weight: 600;
}

.bento-content p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.scroll-indicator-hero {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    z-index: 3;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: var(--gradient-primary);
    animation: scroll-bounce 2s ease-in-out infinite;
}

@keyframes scroll-bounce {
    0%, 100% { transform: translateY(0); opacity: 0.4; }
    50% { transform: translateY(10px); opacity: 1; }
}

/* Buttons */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

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

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
    backdrop-filter: blur(var(--blur-sm));
}

.btn-secondary:hover {
    background: var(--bg-glass-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
}

/* Section Styles */
.section {
    padding: 6rem 0;
    position: relative;
}

.section-dark {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-badge {
    display: inline-block;
    background: var(--bg-glass);
    color: var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    border: 1px solid var(--border-primary);
    backdrop-filter: blur(var(--blur-sm));
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    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: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* About Section */
.about-image {
    position: relative;
}

.image-container {
    position: relative;
    max-width: 400px;
    margin: 0 auto;
}

.profile-placeholder {
    width: 300px;
    height: 300px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.profile-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: conic-gradient(var(--primary-color), var(--secondary-color), var(--accent-color), var(--primary-color));
    animation: rotate 10s linear infinite;
    z-index: -1;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.floating-item {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    animation: float 3s ease-in-out infinite;
}

.floating-item:nth-child(2) {
    animation-delay: -1s;
}

.floating-item:nth-child(3) {
    animation-delay: -2s;
}

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

.about-content h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

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

.about-details {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 2rem 0;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-secondary);
}

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

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

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

.about-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-top: 2rem;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
    text-decoration: none;
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    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: flex;
    align-items: flex-start;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-marker {
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    position: absolute;
    left: 50%;
    top: 1rem;
    transform: translateX(-50%);
    z-index: 2;
    box-shadow: 0 0 0 4px var(--bg-primary);
}

.timeline-content {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    width: calc(50% - 2rem);
    position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: 2rem;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: 2rem;
}

.timeline-period {
    background: var(--gradient-accent);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
}

.timeline-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.timeline-content h4 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

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

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

.tag {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--border-secondary);
}

/* Experience Cards */
.experience-grid {
    display: grid;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.experience-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: all var(--transition-normal);
}

.experience-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-glass-hover);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.company-info h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.company-info h4 {
    font-size: 1rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.experience-period {
    background: var(--gradient-accent);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.company-logo {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.experience-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.experience-achievements {
    list-style: none;
    margin-bottom: 1.5rem;
}

.experience-achievements li {
    color: var(--text-secondary);
    padding: 0.25rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.experience-achievements li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-size: 0.8rem;
}

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

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

.skills-container {
    max-width: 1200px;
    margin: 0 auto;
}

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

.skills-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Skills Navigation */
.skills-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 3rem;
}

.skills-nav-btn {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-normal);
    cursor: pointer;
    white-space: nowrap;
}

.skills-nav-btn:hover {
    transform: translateY(-2px);
    background: var(--bg-glass-hover);
    color: var(--text-primary);
    border-color: var(--accent-color);
}

.skills-nav-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-md);
}

.skills-nav-btn i {
    font-size: 1.1rem;
}

/* Interactive Skills Grid */
.skills-interactive-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-bottom: 3rem;
}

/* Modern Skill Cards */
.skill-card-modern {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    opacity: 1;
    transform: translateY(0);
}

.skill-card-modern:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.skill-card-modern.featured {
    border: 2px solid var(--accent-color);
    position: relative;
    overflow: visible;
}

.skill-card-modern.featured::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    z-index: -1;
    opacity: 0.3;
    filter: blur(8px);
}

.skill-card-inner {
    padding: 1rem;
    position: relative;
    z-index: 1;
}

/* Skill Icon */
.skill-icon-modern {
    position: relative;
    width: 45px;
    height: 45px;
    margin: 0 auto 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    background: var(--gradient-primary);
    overflow: hidden;
}

.skill-icon-modern i {
    font-size: 1.4rem;
    color: white;
    z-index: 2;
    transition: all var(--transition-normal);
}

.skill-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1);
    width: 40px;
    height: 40px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    opacity: 0.3;
    transition: all var(--transition-normal);
    pointer-events: none;
}

/* Skill Content */
.skill-content {
    text-align: center;
}

.skill-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.skill-level-container {
    margin-bottom: 0.4rem;
}

.skill-percentage {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.skill-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.skill-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 3px;
    width: 0%;
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.skill-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
    animation-delay: 1s;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.skill-experience {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Hover Info */
.skill-hover-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 0.75rem;
    text-align: center;
    opacity: 0;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.skill-hover-info p {
    font-size: 0.85rem;
    margin: 0;
    line-height: 1.4;
}

/* Specialty Badge */
.skill-specialty-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--gradient-primary);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 3;
}

/* Skills Stats */
.skills-stats {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-primary);
}

.skills-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    max-width: 650px;
    margin: 0 auto;
}

.stats-item {
    text-align: center;
    padding: 1rem;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
}

.stats-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background: var(--bg-glass-hover);
}

.stats-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.3rem;
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stats-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .skills-nav {
        gap: 0.5rem;
    }
    
    .skills-nav-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .skills-nav-btn span {
        display: none;
    }
    
    .skills-interactive-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .skill-card-modern {
        margin-bottom: 0.5rem;
    }
    
    .skills-summary {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .stats-item {
        padding: 1rem;
    }
    
    .stats-number {
        font-size: 2rem;
    }
    
    /* Mobile hover info always visible */
    .skill-hover-info {
        position: static;
        background: var(--bg-secondary);
        color: var(--text-secondary);
        opacity: 1;
        transform: none;
        margin-top: 1rem;
        border-radius: var(--border-radius-sm);
    }
}

@media (max-width: 480px) {
    .skills-nav-btn {
        padding: 0.4rem 0.8rem;
    }
    
    .skill-card-inner {
        padding: 1rem;
    }
    
    .skill-icon-modern {
        width: 50px;
        height: 50px;
    }
    
    .skill-icon-modern i {
        font-size: 1.5rem;
    }
    
    .stats-number {
        font-size: 1.8rem;
    }
}

/* Animation Classes */
.skill-card-modern[style*="opacity: 0"] {
    opacity: 0 !important;
    transition: all 0.3s ease;
}

.skill-card-modern[style*="opacity: 1"] {
    opacity: 1 !important;
    transition: all 0.3s ease;
}

/* Projects Section */
.project-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.filter-btn {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.project-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all var(--transition-normal);
    position: relative;
}

.project-card.featured {
    grid-column: span 2;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    background: var(--bg-glass-hover);
}

.project-image {
    height: 200px;
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    width: 50px;
    height: 50px;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-normal);
}

.project-link:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.project-icon {
    font-size: 3rem;
    color: white;
    z-index: 1;
}

.featured-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--gradient-accent);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    z-index: 2;
}

.project-content {
    padding: 2rem;
}

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

.project-category {
    font-size: 0.8rem;
    color: var(--primary-color);
    font-weight: 600;
    font-family: var(--font-mono);
}

.project-year {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.project-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

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

.tech-tag {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--border-secondary);
    transition: all var(--transition-normal);
}

.tech-tag:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.project-achievements {
    margin-top: 1rem;
}

.achievement {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Publications Section */
.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

/* Publication Cards */
.publication-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.publication-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.publication-card.featured {
    border: 2px solid var(--accent-color);
    background: linear-gradient(135deg, var(--bg-glass) 0%, rgba(99, 102, 241, 0.05) 100%);
}

.publication-card.featured::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    z-index: -1;
    opacity: 0.1;
    filter: blur(8px);
}

/* Publication Header */
.publication-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.publication-type {
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.publication-type.journal {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
}

.publication-type.conference {
    background: linear-gradient(135deg, #4ecdc4, #44a08d);
    color: white;
}

.publication-status {
    padding: 0.3rem 0.6rem;
    border-radius: 15px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.publication-status.published {
    background: linear-gradient(135deg, #51cf66, #40c057);
    color: white;
}

.publication-status.under-review {
    background: linear-gradient(135deg, #ffd43b, #fab005);
    color: #333;
}

.publication-status.submitted {
    background: linear-gradient(135deg, #74c0fc, #339af0);
    color: white;
}

/* Publication Content */
.publication-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    line-clamp: unset;
    overflow: hidden;
}

.publication-details {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.publication-journal,
.publication-date,
.publication-track {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.publication-journal i,
.publication-date i,
.publication-track i {
    color: var(--accent-color);
    font-size: 0.9rem;
}

.publication-content p {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    line-clamp: unset;
    overflow: hidden;
}

/* Keywords */
.publication-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.keyword {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-color);
    padding: 0.3rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid rgba(99, 102, 241, 0.2);
    transition: all var(--transition-fast);
}

.keyword:hover {
    background: rgba(99, 102, 241, 0.2);
    transform: translateY(-1px);
}

/* Publications Statistics */
.publications-stats {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-primary);
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    max-width: 700px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background: var(--bg-glass-hover);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .publications-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .publication-card {
        padding: 1rem;
    }
    
    .publication-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .publication-details {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .publication-content h3 {
        font-size: 1rem;
        -webkit-line-clamp: unset;
        line-clamp: unset;
    }
    
    .publication-content p {
        -webkit-line-clamp: unset;
        line-clamp: unset;
    }
    
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .stat-item {
        padding: 1rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .publication-card {
        padding: 0.75rem;
    }
    
    .publication-content h3 {
        font-size: 0.95rem;
    }
    
    .publication-content p {
        font-size: 0.85rem;
    }
    
    .keyword {
        font-size: 0.7rem;
        padding: 0.25rem 0.5rem;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
}

/* Animation Enhancements */
.publication-card[data-aos="fade-up"] {
    transform: translateY(30px);
    opacity: 0;
}

.publication-card[data-aos="fade-up"].aos-animate {
    transform: translateY(0);
    opacity: 1;
}

/* Hover Effects for Publication Cards */
.publication-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transition: left 0.5s ease;
    pointer-events: none;
}

.publication-card:hover::after {
    left: 100%;
}

/* Special styling for featured publications */
.publication-card.featured .publication-content h3 {
    color: var(--accent-color);
}

/* Achievements Section */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.achievement-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.achievement-card.highlight {
    border-color: var(--accent-color);
    background: linear-gradient(135deg, var(--bg-glass), rgba(6, 214, 160, 0.05));
}

.achievement-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-glass-hover);
}

.achievement-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    margin: 0 auto 1.5rem;
}

.achievement-card.highlight .achievement-icon {
    background: var(--gradient-accent);
}

.achievement-date {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
}

.achievement-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.achievement-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.achievement-issuer {
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 600;
}

/* Activities Section */
.activities-timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

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

.activity-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 5rem;
}

.activity-icon {
    position: absolute;
    left: 0;
    top: 0;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    box-shadow: 0 0 0 4px var(--bg-secondary);
}

.activity-content {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: all var(--transition-normal);
}

.activity-content:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-glass-hover);
}

.activity-period {
    background: var(--gradient-accent);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
}

.activity-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.activity-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.activity-achievements {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.activity-achievements span {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--border-secondary);
}

/* Contact Section */
.contact-form-container {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius-lg);
    padding: 3rem;
    position: relative;
    overflow: hidden;
}

.contact-form-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.contact-form {
    position: relative;
    z-index: 1;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all var(--transition-normal);
    font-family: var(--font-primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: var(--bg-glass-hover);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-actions {
    text-align: center;
    margin-top: 2rem;
}

.success-message {
    display: none;
    text-align: center;
    padding: 2rem;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 2px solid var(--success-color);
    border-radius: var(--border-radius);
    margin-top: 2rem;
    animation: fadeInUp 0.5s ease;
}

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

.success-icon {
    width: 60px;
    height: 60px;
    background: var(--success-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin: 0 auto 1rem;
}

.success-message h3 {
    color: var(--success-color);
    margin-bottom: 0.5rem;
}

.success-message p {
    color: var(--text-secondary);
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 4rem;
}

.contact-info-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: all var(--transition-normal);
}

.contact-info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background: var(--bg-glass-hover);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin: 0 auto 1rem;
}

.contact-details h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.contact-details p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.contact-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color var(--transition-normal);
}

.contact-link:hover {
    color: var(--secondary-color);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    text-align: center;
}

.footer-brand .brand-logo {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.5rem;
    color: white;
    margin: 0 auto 1rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-brand p {
    color: var(--text-secondary);
    max-width: 300px;
    margin: 0 auto;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-normal);
    font-size: 0.9rem;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

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

.footer-section .social-links a {
    width: 40px;
    height: 40px;
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid var(--border-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
    text-decoration: none;
}

.footer-section .social-links a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.footer-bottom {
    border-top: 1px solid var(--border-primary);
    padding-top: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

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

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

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

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Hidden class for filtering */
.project-item.hidden {
    opacity: 0;
    transform: scale(0.8);
    pointer-events: none;
    transition: all var(--transition-normal);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .container {
        max-width: 100%;
        padding: 0 2rem;
    }
    
    .bento-grid {
        max-width: 350px;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
}

@media (max-width: 992px) {
    .hero-stats {
        gap: 1.5rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .timeline::before {
        left: 1rem;
    }
    
    .timeline-marker {
        left: 1rem;
    }
    
    .timeline-content {
        width: calc(100% - 3rem);
        margin-left: 3rem !important;
        margin-right: 0 !important;
    }
    
    .activities-timeline::before {
        left: 1.5rem;
    }
    
    .activity-item {
        padding-left: 4rem;
    }
    
    .activity-icon {
        left: 0;
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    body {
        cursor: auto;
    }
    
    .cursor,
    .cursor-follower {
        display: none;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        justify-content: center;
        gap: 1rem;
    }
    
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(4, 60px);
        max-width: 280px;
    }
    
    .bento-item.large {
        grid-column: span 2;
        grid-row: span 2;
    }
    
    .about-actions {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .achievements-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info-grid {
        grid-template-columns: 1fr;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-form-container {
        padding: 2rem;
    }
    
    .floating-item {
        display: none;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }
    
    .section-title {
        font-size: clamp(1.5rem, 6vw, 2.5rem);
    }
    
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem !important;
        margin: 0.25rem 0;
    }
    
    .timeline-content,
    .experience-card,
    .publication-card,
    .activity-content {
        padding: 1.5rem;
    }
    
    .profile-placeholder {
        width: 250px;
        height: 250px;
        font-size: 3rem;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }
}

/* Performance optimizations for mobile */
@media (max-width: 768px) {
    .performance-mode * {
        animation-duration: 0.1s !important;
        transition-duration: 0.1s !important;
    }
    
    .performance-mode .floating-elements,
    .performance-mode #three-container {
        display: none !important;
    }
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Utility classes */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Logo styling for navbar */
.brand-logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    margin-right: 10px;
    border-radius: 8px;
}

/* Logo styling for footer */
.footer-logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
    margin-bottom: 15px;
    border-radius: 12px;
}

/* Preloader logo is already styled inline */

/* Responsive adjustments */
@media (max-width: 768px) {
    .brand-logo-img {
        width: 35px;
        height: 35px;
    }
    
    .footer-logo {
        width: 50px;
        height: 50px;
    }
}