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

:root {
    /* Color Palette - Dark Theme */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121c;
    --bg-card: #1a1a27;
    --bg-accent: #1e1e2e;
    
    /* Text Colors */
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --text-muted: #707080;
    
    /* Accent Colors - Data Analytics Focus */
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    --accent-data: #06b6d4;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #1e1e2e 0%, #12121c 100%);
    --gradient-data: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

section {
    padding: var(--space-xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    position: relative;
    display: inline-block;
}

.section-title .section-number {
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 1.5rem;
    margin-right: var(--space-xs);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    max-width: 700px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.2;
}

p {
    margin-bottom: var(--space-sm);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    outline: none;
    font-family: var(--font-primary);
}

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

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

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background-color: var(--bg-accent);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--space-md);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 700;
    font-size: 1.5rem;
}

.logo-icon {
    color: var(--accent-primary);
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 800;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

.nav-menu a:hover {
    color: var(--text-primary);
}

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

.nav-menu a:hover::after {
    width: 100%;
}

.btn-nav {
    padding: 0.5rem 1.25rem;
    background-color: transparent;
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-md);
    color: var(--accent-primary);
}

.btn-nav:hover {
    background-color: rgba(59, 130, 246, 0.1);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding-top: 8rem;
    padding-bottom: var(--space-xl);
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--space-xl);
    align-items: center;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-md);
}

.hero-greeting {
    display: block;
    font-size: 1.3rem;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.hero-name {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-tagline {
    display: block;
    font-size: 1.6rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    max-width: 90%;
}

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

.hero-contact {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.contact-link i {
    width: 20px;
    color: var(--accent-primary);
}

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

.hero-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--bg-card);
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: all var(--transition-normal);
}

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

/* Data Visualization in Hero */
.data-visualization {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.chart-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    height: 200px;
    margin-bottom: var(--space-sm);
    padding: 0 var(--space-sm);
}

.chart-bar {
    width: 22%;
    background: var(--gradient-data);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: height var(--transition-slow);
    position: relative;
}

.chart-bar::after {
    content: attr(data-value);
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.chart-labels {
    display: flex;
    justify-content: space-between;
    padding: 0 var(--space-sm);
}

.chart-labels span {
    width: 22%;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.about-text p {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.stat-item {
    text-align: center;
    padding: var(--space-md);
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-5px);
    border-color: rgba(59, 130, 246, 0.3);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-data);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.skill-category {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    transition: transform var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.skill-category:hover {
    transform: translateY(-5px);
    border-color: rgba(59, 130, 246, 0.3);
}

.skill-category-title {
    font-size: 1.2rem;
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.skill-category-title i {
    color: var(--accent-primary);
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.skill-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.skill-name {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.skill-level {
    width: 60%;
    height: 6px;
    background-color: var(--bg-accent);
    border-radius: 3px;
    overflow: hidden;
}

.skill-level-bar {
    height: 100%;
    background: var(--gradient-data);
    border-radius: 3px;
    transition: width var(--transition-slow);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
    gap: var(--space-lg);
}

@media (max-width: 1100px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

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

.project-card:hover {
    transform: translateY(-8px);
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: var(--shadow-lg);
}

.project-header {
    padding: var(--space-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    background-color: var(--bg-accent);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.project-badge {
    background: var(--gradient-data);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

.project-title {
    font-size: 1.4rem;
    margin: 0.5rem 0;
}

.project-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.project-body {
    padding: var(--space-md);
}

.project-problem, .project-solution, .project-tech, .project-impact {
    margin-bottom: var(--space-md);
}

.project-body h4 {
    color: var(--accent-primary);
    margin-bottom: var(--space-xs);
    font-size: 1rem;
}

.project-body p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-xs);
}

.tech-tag {
    background-color: var(--bg-accent);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

.project-impact ul {
    list-style-position: inside;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.project-impact li {
    margin-bottom: 0.25rem;
}

.project-footer {
    padding: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    gap: var(--space-md);
}

.project-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--accent-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* Education & Certifications */
.education-timeline {
    position: relative;
    padding-left: var(--space-md);
}

.education-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
    opacity: 0.3;
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-xl);
}

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--space-md) - 9px);
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: 3px solid var(--bg-primary);
}

.cert-marker {
    background: var(--gradient-data);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
}

.timeline-content {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    margin-bottom: var(--space-sm);
}

.timeline-title {
    font-size: 1.2rem;
    width: 100%;
    margin-bottom: var(--space-xs);
}

.timeline-company {
    color: var(--accent-primary);
    font-weight: 500;
}

.timeline-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.cert-skills h4 {
    color: var(--accent-primary);
    margin-bottom: var(--space-xs);
    font-size: 1rem;
}

.skill-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-xs);
}

.skill-chip {
    background-color: var(--bg-accent);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

/* Languages */
.languages-section {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.languages-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-md);
}

.language-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm);
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.language-name {
    font-weight: 500;
}

.language-level {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.contact-method {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.contact-details a {
    color: var(--accent-primary);
    font-weight: 500;
    display: block;
    margin-bottom: 0.25rem;
}

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

.contact-form {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 500;
    color: var(--text-primary);
}

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

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

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    padding: var(--space-xl) 0 var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

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

.footer-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.footer-name {
    margin-left: var(--space-xs);
}

.footer-tagline {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-size: 1.1rem;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--bg-card);
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: all var(--transition-normal);
}

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

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--space-xs);
}

.footer-location {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 992px) {
    .hero-content,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        padding: 0.75rem var(--space-md);
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: var(--space-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        z-index: 999;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero {
        padding-top: 7rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .timeline-date {
        margin-top: var(--space-xs);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }
    
    section {
        padding: var(--space-lg) 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-tagline {
        font-size: 1.3rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
}

/* Animation for scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Form Messages */
.form-message {
    margin-top: var(--space-md);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    display: none;
    animation: fadeIn 0.3s ease;
}

.form-message.success {
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #10b981;
}

.form-message.error {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Loading animation for button */
.fa-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}