/* ============================================
   CSS Variables & Root Styles
   ============================================ */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: #16161f;
    
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.3);
    
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
    
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    
    --border-color: #27272a;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px var(--accent-glow);
    
    --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: 'Fira Code', 'Consolas', monospace;
    
    --container-width: 1200px;
    --section-padding: 100px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: var(--section-padding) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    gap: 8px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-sm), 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 30px var(--accent-glow);
}

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

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

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    padding: 12px 0;
    border-bottom-color: var(--border-color);
    background: rgba(10, 10, 15, 0.95);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-secondary);
    transition: color var(--transition-fast);
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 10px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-secondary);
    background: rgba(99, 102, 241, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 120px 24px 60px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: var(--container-width);
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-size: 1.1rem;
    color: var(--accent-secondary);
    font-weight: 500;
    margin-bottom: 12px;
}

.hero-name {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
}

.hero-title-prefix {
    font-family: var(--font-mono);
    color: var(--success);
    font-size: 1.5rem;
}

.hero-title {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--accent-secondary);
}

.cursor {
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-social {
    display: flex;
    gap: 16px;
}

.hero-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.hero-social a:hover {
    color: var(--accent-secondary);
    border-color: var(--accent-primary);
    transform: translateY(-3px);
    box-shadow: 0 0 20px var(--accent-glow);
}

/* Terminal */
.hero-visual {
    display: flex;
    justify-content: center;
}

.terminal {
    width: 100%;
    max-width: 500px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.terminal-dot.red { background: #ff5f56; }
.terminal-dot.yellow { background: #ffbd2e; }
.terminal-dot.green { background: #27ca40; }

.terminal-title {
    margin-left: auto;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.terminal-body {
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
}

.terminal-body p {
    margin-bottom: 4px;
}

.terminal-body .prompt {
    color: var(--success);
    margin-right: 8px;
}

.terminal-body .output {
    color: var(--text-muted);
    padding-left: 20px;
}

.terminal-body .success {
    color: var(--success);
}

.cursor-blink {
    animation: blink 1s infinite;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
    animation: float 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* ============================================
   About Section
   ============================================ */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-text strong {
    color: var(--accent-secondary);
}

.about-details {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-top: 32px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.stat-card {
    background: var(--bg-card);
    padding: 24px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

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

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.skill-category {
    background: var(--bg-card);
    padding: 28px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.skill-category:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.skill-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.skill-category h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    padding: 6px 12px;
    font-size: 0.85rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.skill-category:hover .tag {
    border-color: var(--accent-primary);
    color: var(--accent-secondary);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-left: 40px;
    padding-bottom: 50px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -7px;
    top: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-primary);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.timeline-content {
    background: var(--bg-card);
    padding: 28px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.timeline-content:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

.timeline-header {
    margin-bottom: 16px;
}

.timeline-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.timeline-header .company {
    display: block;
    color: var(--accent-secondary);
    font-weight: 500;
    margin-bottom: 4px;
}

.timeline-header .date {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.timeline-details {
    margin-bottom: 16px;
}

.timeline-details li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.timeline-details li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.timeline-tags span {
    padding: 4px 12px;
    font-size: 0.8rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-secondary);
    border-radius: 20px;
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    padding: 28px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.project-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.project-card.featured {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-color: rgba(99, 102, 241, 0.3);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.project-icon {
    font-size: 2.5rem;
}

.project-links {
    display: flex;
    gap: 12px;
}

.project-links a {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

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

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.project-features {
    margin-bottom: 20px;
}

.project-features li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.project-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    padding: 4px 12px;
    font-size: 0.8rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

/* ============================================
   Certifications Section
   ============================================ */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.cert-card {
    background: var(--bg-card);
    padding: 32px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-normal);
}

.cert-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.cert-logo {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
}

.cert-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

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

/* ============================================
   Contact Section
   ============================================ */
.contact {
    background: var(--bg-secondary);
}

.contact-intro {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 50px;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    background: var(--bg-card);
    padding: 28px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-normal);
}

.contact-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.contact-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.contact-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

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

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 40px 24px;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

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

.footer strong {
    color: var(--accent-secondary);
}

.footer-year {
    margin-top: 8px;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-name {
        font-size: 3rem;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-social {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .stat-card {
        flex: 1;
        min-width: 150px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 70px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        gap: 16px;
        padding: 60px 24px;
        border-left: 1px solid var(--border-color);
        transition: right var(--transition-normal);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero-name {
        font-size: 2.5rem;
    }
    
    .hero-title {
        font-size: 1.2rem;
    }
    
    .terminal {
        max-width: 100%;
    }
    
    .timeline::before {
        left: 8px;
    }
    
    .timeline-marker {
        left: 1px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured {
        grid-column: 1;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .about-details {
        flex-direction: column;
        gap: 12px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

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

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

/* Scroll reveal animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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