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

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Accessibility improvements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Progress Bar */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, #3498db, #2ecc71, #f39c12);
    z-index: 1001;
    transition: width 0.1s ease;
}

/* Navigation */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-logo a:hover {
    color: #3498db;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: #333;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #3498db;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: #3498db;
    transition: width 0.3s ease;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section Enhanced */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-block;
    margin-bottom: 1rem;
}

.availability-status {
    background: rgba(46, 204, 113, 0.2);
    color: #2ecc71;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid rgba(46, 204, 113, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
    animation: slideInUp 0.8s ease;
}

.highlight {
    color: #ffd700;
    background: linear-gradient(45deg, #ffd700, #ffed4e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 300;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: slideInUp 0.8s ease 0.2s both;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    animation: slideInUp 0.8s ease 0.4s both;
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: #ffd700;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 0.2rem;
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
    animation: slideInUp 0.8s ease 0.6s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    animation: slideInUp 0.8s ease 0.8s both;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: white;
}

.btn-outline {
    background-color: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.social-links {
    display: flex;
    gap: 1rem;
    animation: slideInUp 0.8s ease 1s both;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-links a:hover {
    transform: translateY(-3px);
    background: rgba(255, 255, 255, 0.2);
    color: #ffd700;
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.floating-icons {
    position: relative;
    width: 300px;
    height: 300px;
}

.icon-item {
    position: absolute;
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: #ffd700;
    animation: float 6s ease-in-out infinite;
    animation-delay: var(--delay);
}

.icon-item:nth-child(1) { top: 0; left: 50%; transform: translateX(-50%); }
.icon-item:nth-child(2) { top: 25%; right: 0; }
.icon-item:nth-child(3) { bottom: 25%; right: 0; }
.icon-item:nth-child(4) { bottom: 0; left: 50%; transform: translateX(-50%); }
.icon-item:nth-child(5) { top: 25%; left: 0; }

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

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    animation: bounce 2s infinite;
    cursor: pointer;
}

.scroll-indicator span {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

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

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

/* Section Styles */
.section-title {
    font-size: 2.8rem;
    text-align: center;
    margin-bottom: 3rem;
    color: #2c3e50;
    position: relative;
    font-weight: 700;
}

.section-title::after {
    content: '';
    position: absolute;
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #3498db, #2ecc71);
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

/* About Section */
.about {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

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

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
}

.certifications {
    margin-top: 2rem;
    padding: 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.certifications h3 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.certifications h3::before {
    content: '🏆';
    font-size: 1.2rem;
}

.certifications ul {
    list-style: none;
}

.certifications li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem;
    background: #f8f9fa;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.certifications li:hover {
    background: #e3f2fd;
    transform: translateX(5px);
}

.certifications i {
    color: #3498db;
    font-size: 1.2rem;
    min-width: 20px;
}

.skills-grid {
    display: grid;
    gap: 2rem;
}

.skill-category {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.skill-category h3 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-category h3::before {
    content: '⚡';
    font-size: 1.2rem;
}

.skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    padding: 0.6rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.skill-tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.skill-tag:hover::before {
    left: 100%;
}

.skill-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
}

/* Services Section */
.services {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.services-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.services-intro p {
    font-size: 1.2rem;
    color: #666;
    line-height: 1.8;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.service-card {
    background: white;
    border-radius: 15px;
    padding: 2.5rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid rgba(52, 152, 219, 0.1);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: rgba(52, 152, 219, 0.3);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

.service-card:hover .service-icon {
    transform: scale(1.1);
    background: linear-gradient(135deg, #2980b9, #1f4e79);
}

.service-icon i {
    font-size: 2rem;
    color: white;
}

.service-content h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 600;
}

.service-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.service-features {
    list-style: none;
    padding: 0;
}

.service-features li {
    padding: 0.5rem 0;
    color: #555;
    position: relative;
    padding-left: 1.5rem;
}

.service-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #27ae60;
    font-weight: bold;
    font-size: 1.1rem;
}

.services-cta {
    background: linear-gradient(135deg, #3498db, #2980b9);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
    color: white;
    margin-top: 3rem;
}

.services-cta h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: white;
}

.services-cta p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.services-cta .btn {
    background: white;
    color: #3498db;
    border: none;
}

.services-cta .btn:hover {
    background: #f8f9fa;
    transform: translateY(-3px);
}

/* Mobile Responsiveness for Services */
@media (max-width: 768px) {
    .services-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .service-card {
        padding: 2rem;
    }
    
    .services-cta {
        padding: 2rem;
        margin: 2rem 1rem 0;
    }
    
    .services-cta h3 {
        font-size: 1.5rem;
    }
}

/* Achievements Section */
.achievements {
    padding: 100px 0;
    background: white;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.achievement-card {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
    position: relative;
    overflow: hidden;
}

.achievement-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(135deg, #3498db, #2ecc71, #f39c12);
}

.achievement-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.achievement-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    color: white;
}

.achievement-content h3 {
    color: #2c3e50;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.achievement-number {
    font-size: 3rem;
    font-weight: bold;
    color: #3498db;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #3498db, #2ecc71);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.achievement-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

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

.tag {
    background: #f8f9fa;
    color: #666;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid #e9ecef;
}

/* Publications Section */
.publications-section {
    margin-top: 3rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 16px;
}

.publications-section h3 {
    color: #2c3e50;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.publications-section h3::before {
    content: '📄';
    font-size: 1.3rem;
}

.publication-item {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.publication-content h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.publication-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.publication-meta {
    display: flex;
    gap: 1rem;
}

.publication-type,
.publication-year {
    background: #3498db;
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Experience Section */
.experience {
    padding: 80px 0;
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: #3498db;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 60px;
}

.timeline-marker {
    position: absolute;
    left: 11px;
    top: 0;
    width: 20px;
    height: 20px;
    background-color: #3498db;
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: 0 0 0 4px #3498db;
}

.timeline-content {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.timeline-content h3 {
    color: #2c3e50;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    color: #3498db;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.timeline-date {
    color: #7f8c8d;
    font-style: italic;
    margin-bottom: 1rem;
    display: block;
}

.timeline-content ul {
    list-style: none;
    margin-top: 1rem;
}

.timeline-content li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
}

.timeline-content li::before {
    content: '▶';
    color: #3498db;
    position: absolute;
    left: 0;
}

/* Contact Section Enhanced */
.contact {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.contact-intro {
    text-align: center;
    margin-bottom: 4rem;
}

.contact-intro p {
    font-size: 1.2rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

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

.contact-info h3 {
    color: #2c3e50;
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.contact-info p {
    color: #666;
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 3rem;
}

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

.contact-method {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.contact-method:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.contact-method.priority {
    border-left: 4px solid #3498db;
}

.method-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.method-content h4 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.method-content a {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    display: block;
    margin-bottom: 0.3rem;
    transition: color 0.3s ease;
}

.method-content a:hover {
    color: #2980b9;
}

.response-time {
    font-size: 0.9rem;
    color: #888;
    font-style: italic;
}

.availability-notice {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(46, 204, 113, 0.1);
    border: 1px solid rgba(46, 204, 113, 0.3);
    border-radius: 8px;
    color: #27ae60;
    font-weight: 500;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #2ecc71;
    animation: pulse 2s infinite;
}

/* Contact Form Enhanced */
.contact-form-container {
    background: white;
    padding: 3rem;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.form-header {
    text-align: center;
    margin-bottom: 2rem;
}

.form-header h3 {
    color: #2c3e50;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.form-header p {
    color: #666;
    font-size: 1rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #2c3e50;
    font-weight: 600;
    font-size: 0.95rem;
}

.required {
    color: #e74c3c;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group input.error,
.form-group textarea.error {
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

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

.character-count {
    text-align: right;
    font-size: 0.85rem;
    color: #888;
    margin-top: 0.5rem;
}

.error-message {
    color: #e74c3c;
    font-size: 0.85rem;
    margin-top: 0.5rem;
    display: none;
}

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

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.submit-btn {
    width: 100%;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    background: linear-gradient(135deg, #3498db, #2980b9);
    border: none;
    border-radius: 8px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(52, 152, 219, 0.3);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-loading {
    display: none;
}

.form-success {
    text-align: center;
    padding: 2rem;
    background: rgba(46, 204, 113, 0.1);
    border: 1px solid rgba(46, 204, 113, 0.3);
    border-radius: 8px;
    color: #27ae60;
    margin-top: 1rem;
}

.form-success i {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
}

/* Footer Enhanced */
.footer {
    background: linear-gradient(135deg, #2c3e50, #34495e);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    color: #ecf0f1;
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    font-weight: 600;
}

.footer-section p {
    color: #bdc3c7;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.footer-social a:hover {
    background: #3498db;
    transform: translateY(-3px);
}

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

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #3498db;
}

.location-info p {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.8rem;
    color: #bdc3c7;
}

.location-info i {
    color: #3498db;
    width: 16px;
}

.availability-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #2ecc71;
    animation: pulse 2s infinite;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-meta {
    display: flex;
    gap: 1rem;
    color: #95a5a6;
    font-size: 0.9rem;
}

/* Animation and Utility Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease forwards;
}

[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media screen and (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .floating-icons {
        width: 250px;
        height: 250px;
    }
    
    .achievements-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

@media screen and (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
        height: calc(100vh - 70px);
        overflow-y: auto;
    }

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

    .nav-toggle {
        display: flex;
    }

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

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

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

    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.4rem;
    }

    .hero-stats {
        justify-content: center;
        gap: 1.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .btn {
        min-width: 200px;
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

    .section-title {
        font-size: 2.2rem;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .achievements-grid {
        grid-template-columns: 1fr;
    }

    .achievement-card {
        padding: 2rem;
    }

    .timeline {
        margin-left: 1rem;
    }

    .timeline-item {
        padding-left: 40px;
    }

    .timeline::before {
        left: 10px;
    }

    .timeline-marker {
        left: 1px;
    }

    .contact-methods {
        gap: 1rem;
    }

    .contact-method {
        padding: 1rem;
    }

    .method-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .contact-form-container {
        padding: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
}

@media screen and (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 90px 0 50px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.9rem;
        min-width: 180px;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .achievement-card {
        padding: 1.5rem;
    }

    .achievement-number {
        font-size: 2.5rem;
    }

    .contact-form-container {
        padding: 1.5rem;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 0.8rem;
    }

    .submit-btn {
        padding: 0.8rem 1.5rem;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn-primary {
        background: #000;
        border: 2px solid #000;
    }
    
    .skill-tag {
        background: #000;
        border: 1px solid #fff;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .scroll-indicator {
        animation: none;
    }
    
    .floating-icons .icon-item {
        animation: none;
    }
}

/* Print styles */
@media print {
    .navbar,
    .footer,
    .scroll-indicator,
    .floating-icons {
        display: none;
    }
    
    .hero {
        background: none;
        color: #000;
        padding: 2rem 0;
    }
    
    .section-title::after {
        display: none;
    }
    
    .achievement-card,
    .contact-form-container {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* Dark mode support (if system preference) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #e0e0e0;
        --card-bg: #2d2d2d;
        --border-color: #404040;
    }
    
    /* This would be for a full dark mode implementation */
    /* Currently commented out to maintain the current design */
}

/* Loading and performance optimizations */
.loading {
    opacity: 0;
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

/* Focus indicators for accessibility */
*:focus {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}

.btn:focus,
.nav-link:focus {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

/* Smooth scrolling enhancement */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #3498db, #2980b9);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #2980b9, #3498db);
}