/* ===================================
   PORTFOLIO PROFESSIONNEL SOBRE
   Designer: Erwan Oubda
   Style: Dark, Clean, Minimal
   =================================== */

/* ===================================
   CSS VARIABLES
   =================================== */
:root {
    /* Dark Theme Colors */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-elevated: #1c2128;
    
    /* Text Colors */
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-tertiary: #6e7681;
    --text-white: #ffffff;
    
    /* Accent Colors - Subtle */
    --accent-primary: #58a6ff;
    --accent-hover: #79c0ff;
    --accent-muted: #388bfd26;
    
    /* Border Colors */
    --border-default: #30363d;
    --border-muted: #21262d;
    --border-subtle: #161b22;
    
    /* Success & Status */
    --success: #3fb950;
    --success-muted: #3fb95026;
    --warning: #d29922;
    --error: #f85149;
    
    /* Shadows - Minimal */
    --shadow-sm: 0 1px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 3px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-border: inset 0 0 0 1px var(--border-default);
    
    /* Transitions */
    --transition-fast: 0.1s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
    
    /* Border Radius - Subtle */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    --font-mono: 'SF Mono', 'Consolas', 'Liberation Mono', Menlo, monospace;
    
    /* Z-index */
    --z-sticky: 100;
    --z-fixed: 200;
    --z-modal: 300;
}

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

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

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   TYPOGRAPHY
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-primary);
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

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

a:hover {
    color: var(--accent-hover);
}

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

/* ===================================
   UTILITY CLASSES
   =================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.pulse {
    animation: pulse 2s infinite;
}

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

/* ===================================
   SECTION HEADERS
   =================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    padding: 0.5rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    border-radius: var(--radius-lg);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.section-description {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.7;
}

/* ===================================
   BUTTONS
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-default);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    white-space: nowrap;
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-primary {
    background: var(--accent-primary);
    color: var(--text-white);
    border-color: var(--accent-primary);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-default);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-default);
}

/* ===================================
   NAVIGATION
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-default);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(13, 17, 23, 0.95);
    box-shadow: var(--shadow-md);
}

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

.logo {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

.logo-dot {
    color: var(--primary-color);
    font-size: 2rem;
}

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

.nav-link {
    font-weight: 400;
    font-size: 0.875rem;
    color: var(--text-secondary);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-primary);
    transition: var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    cursor: pointer;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -6px);
}

/* ===================================
   NAV CONTROLS
   =================================== */
.nav-controls {
    display: flex;
    align-items: center;
}

/* ===================================
   HERO SECTION
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 8rem 0 4rem;
}

.hero-background {
    display: none;
}
.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text {
    animation: fadeInUp 1s ease;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    background: var(--success-muted);
    color: var(--success);
    border: 1px solid var(--success);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.hero-tag i {
    color: var(--success);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.typed-text {
    color: var(--accent-primary);
}

.cursor {
    animation: blink 1s infinite;
}

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

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

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

.social-link {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--bg-elevated);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Code Window */
.hero-visual {
    animation: fadeInUp 1s ease 0.3s backwards;
}

.code-window {
    background: var(--dark);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
}

.code-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--dark-secondary);
}

.code-dots {
    display: flex;
    gap: 0.5rem;
}

.code-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-dots span:nth-child(1) { background: #ef4444; }
.code-dots span:nth-child(2) { background: #f59e0b; }
.code-dots span:nth-child(3) { background: #10b981; }

.code-title {
    color: var(--text-light);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

.code-content {
    padding: 1.5rem;
    overflow-x: auto;
}

.code-content pre {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
}

.code-keyword { color: #c678dd; }
.code-class { color: #e5c07b; }
.code-function { color: #61afef; }
.code-string { color: #98c379; }
.code-variable { color: #e06c75; }
.code-property { color: #d19a66; }

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    animation: bounce 2s infinite;
}

.mouse {
    width: 24px;
    height: 36px;
    border: 2px solid var(--text-light);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 3px;
    height: 8px;
    background: var(--text-light);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { top: 8px; opacity: 1; }
    100% { top: 20px; opacity: 0; }
}

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

/* ===================================
   ABOUT SECTION
   =================================== */
.about {
    padding: var(--spacing-2xl) 0;
    background: var(--text-white);
}

.about-content {
    display: grid;
    gap: var(--spacing-xl);
}

.about-text {
    font-size: 1.125rem;
    line-height: 1.8;
}

.about-intro {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

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

.highlight-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--light);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.highlight-item:hover {
    background: var(--light-secondary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

.highlight-item h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.highlight-item p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

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

.stat-card {
    padding: 2rem;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    text-align: center;
    color: var(--text-white);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
    font-weight: 500;
}

/* ===================================
   EXPERIENCE SECTION
   =================================== */
.experience {
    padding: var(--spacing-2xl) 0;
    background: var(--light);
}

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

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

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

.timeline-marker {
    position: absolute;
    left: -8px;
    top: 0;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border: 3px solid var(--text-white);
    border-radius: 50%;
    box-shadow: var(--shadow-md);
    z-index: 1;
}

.timeline-content {
    background: var(--text-white);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

.timeline-content:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
}

.timeline-date {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.timeline-content h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.timeline-content > p {
    margin-bottom: 1rem;
}

/* Featured Experience (Current Position) */
.featured-experience {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    border: 2px solid var(--primary-light);
    position: relative;
    overflow: hidden;
}

.featured-experience::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.timeline-marker.current {
    background: var(--success);
    animation: pulse-marker 2s infinite;
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
}

@keyframes pulse-marker {
    0% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    }
}

.timeline-date.current-position {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.company-link {
    color: var(--primary-color);
    transition: var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.company-link:hover {
    color: var(--primary-dark);
}

.company-link i {
    font-size: 0.875rem;
}

.timeline-tasks {
    list-style: none;
    margin: 1rem 0;
}

.timeline-tasks li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.timeline-tasks i {
    color: var(--success);
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.tag {
    padding: 0.375rem 0.875rem;
    background: var(--light);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.tag:hover {
    background: var(--primary-color);
    color: var(--text-white);
}

/* ===================================
   PROJECTS SECTION
   =================================== */
.projects {
    padding: var(--spacing-2xl) 0;
    background: var(--text-white);
}

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

.project-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-default);
    transition: all var(--transition-base);
}

.project-card:hover {
    border-color: var(--border-subtle);
    transform: translateY(-2px);
}

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

.project-image {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
    background: var(--light);
}

.project-card.featured .project-image {
    height: 350px;
}

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

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

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-base);
}

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

.project-link {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--text-white);
    color: var(--primary-color);
    border-radius: 50%;
    font-size: 1.5rem;
    transition: var(--transition-base);
}

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

.project-content {
    padding: 2rem;
}

.project-tag {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: var(--light);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.featured-tag {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-color);
}

.project-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

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

.project-tech span {
    padding: 0.375rem 0.875rem;
    background: var(--light);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
}

/* ===================================
   CERTIFICATIONS SECTION
   =================================== */
.certifications {
    padding: var(--spacing-2xl) 0;
    background: var(--light);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.cert-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    border: 1px solid var(--border-default);
}

.cert-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.cert-card.google {
    border-top-color: #4285f4;
}

.cert-card.ibm {
    border-top-color: #0f62fe;
}

.cert-card.deeplearning {
    border-top-color: #8b5cf6;
}

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

.cert-logo {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light);
    border-radius: var(--radius-lg);
    font-size: 2rem;
}

.cert-card.google .cert-logo {
    color: #4285f4;
}

.cert-card.ibm .cert-logo {
    color: #0f62fe;
}

.cert-card.deeplearning .cert-logo {
    color: #8b5cf6;
}

.cert-badge {
    padding: 0.375rem 0.875rem;
    background: var(--light);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-md);
}

.cert-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.cert-issuer {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.cert-description {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.cert-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.cert-skills span {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.875rem;
    background: var(--light);
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-radius: var(--radius-md);
}

.cert-skills i {
    font-size: 0.75rem;
}

.cert-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--light-tertiary);
}

.cert-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.cert-verify {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.875rem;
    transition: var(--transition-base);
}

.cert-verify:hover {
    color: var(--primary-dark);
    gap: 0.75rem;
}

/* ===================================
   SKILLS SECTION
   =================================== */
.skills {
    padding: var(--spacing-2xl) 0;
    background: var(--text-white);
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.skill-category {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    border: 1px solid var(--border-default);
}

.skill-category:hover {
    border-color: var(--border-subtle);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.category-header i {
    font-size: 1.5rem;
    color: var(--accent-primary);
}

.category-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.skill-item {
    width: 100%;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.skill-name {
    font-weight: 600;
    color: var(--text-primary);
}

.skill-level {
    font-size: 0.875rem;
    color: var(--text-light);
}

.skill-bar {
    height: 8px;
    background: var(--light-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    width: 0;
    transition: width 1s ease;
}

/* Languages */
.languages {
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--light);
    border-radius: var(--radius-xl);
}

.languages-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.languages-title i {
    color: var(--primary-color);
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.language-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 1rem;
    background: var(--text-white);
    border-radius: var(--radius-lg);
    text-align: center;
}

.language-name {
    font-weight: 600;
    color: var(--text-primary);
}

.language-level {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ===================================
   CONTACT SECTION
   =================================== */
.contact {
    padding: var(--spacing-2xl) 0;
    background: var(--light);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-card {
    background: var(--text-white);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.contact-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--text-white);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.contact-card h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.contact-card a {
    color: var(--primary-color);
    display: block;
    margin-bottom: 0.25rem;
}

.contact-card a:hover {
    text-decoration: underline;
}

.contact-card p {
    color: var(--text-secondary);
    margin: 0;
}

.contact-social {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.contact-social a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    transition: var(--transition-base);
}

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

/* Contact Form */
.contact-form-wrapper {
    background: var(--text-white);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group label i {
    color: var(--primary-color);
    font-size: 0.875rem;
}

.form-group input,
.form-group textarea {
    padding: 0.875rem 1rem;
    border: 2px solid var(--light-tertiary);
    border-radius: var(--radius-lg);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-base);
    background: var(--light);
}

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

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

.btn-submit {
    margin-top: 1rem;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background: var(--dark);
    color: var(--text-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-logo h3 {
    font-size: 1.75rem;
    color: var(--text-white);
    margin-bottom: 0.5rem;
}

.footer-logo span {
    color: var(--primary-color);
}

.footer-logo p {
    color: var(--text-light);
    margin: 0;
}

.footer-links h4,
.footer-contact h4,
.footer-social h4 {
    color: var(--text-white);
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.footer-links ul,
.footer-contact ul {
    list-style: none;
}

.footer-links li,
.footer-contact li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--text-light);
    transition: var(--transition-base);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-light);
}

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

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

.social-links a {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark-secondary);
    border-radius: var(--radius-lg);
    color: var(--text-white);
    transition: var(--transition-base);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--dark-tertiary);
    color: var(--text-light);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

.footer-bottom i {
    color: #ef4444;
    animation: heartbeat 1.5s infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    10%, 30% { transform: scale(1.1); }
    20%, 40% { transform: scale(1); }
}

/* ===================================
   SCROLL TO TOP BUTTON
   =================================== */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--text-white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(59, 130, 246, 0.6);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

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

.fade-in-left {
    animation: fadeInLeft 0.6s ease;
}

.fade-in-right {
    animation: fadeInRight 0.6s ease;
}

.scale-in {
    animation: scaleIn 0.6s ease;
}

/* Hover Effects */
.hover-lift {
    transition: transform var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-5px);
}

.hover-glow {
    transition: all var(--transition-base);
}

.hover-glow:hover {
    animation: glow 2s infinite;
}

/* Shimmer Effect for Loading */
.shimmer {
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.5) 50%,
        transparent 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
}

/* Glass Morphism Effect */
.glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .glass {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Neon Text Effect */
.neon-text {
    text-shadow: 
        0 0 10px rgba(59, 130, 246, 0.5),
        0 0 20px rgba(59, 130, 246, 0.3),
        0 0 30px rgba(59, 130, 246, 0.2);
}

/* Parallax Layers */
.parallax-layer {
    transition: transform 0.3s ease-out;
}

/* Enhanced Button Animations */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn span,
.btn i {
    position: relative;
    z-index: 1;
}

/* Card Hover Effects */
.project-card,
.cert-card,
.skill-category {
    position: relative;
    transition: all var(--transition-base);
}

.project-card::after,
.cert-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: -1;
    border-radius: inherit;
}

.project-card:hover::after,
.cert-card:hover::after {
    opacity: 0.05;
}

/* Smooth Scroll Reveal */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.6s ease-out;
}

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

/* Gradient Text Animation */
@keyframes gradient-shift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.animated-gradient-text {
    background: linear-gradient(-45deg, #3b82f6, #8b5cf6, #ec4899, #3b82f6);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 5s ease infinite;
}

/* Loading Spinner */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.spinner {
    border: 3px solid var(--light-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

/* Typewriter Effect Enhancement */
@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

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

/* Floating Animation for Hero Elements */
.hero-visual {
    animation: float 6s ease-in-out infinite;
}

/* Enhanced Timeline Animation */
.timeline-item {
    opacity: 1;
    transform: translateX(0);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.timeline-item.in-view {
    opacity: 1;
    transform: translateX(0);
}

/* Staggered Animation */
.timeline-item:nth-child(1) { transition-delay: 0s; }
.timeline-item:nth-child(2) { transition-delay: 0s; }
.timeline-item:nth-child(3) { transition-delay: 0s; }
.timeline-item:nth-child(4) { transition-delay: 0s; }
.timeline-item:nth-child(5) { transition-delay: 0s; }

/* Project Cards Grid Animation */
.project-card {
    opacity: 1;
    transform: translateY(0) scale(1);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card.in-view {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.project-card:nth-child(1) { transition-delay: 0s; }
.project-card:nth-child(2) { transition-delay: 0s; }
.project-card:nth-child(3) { transition-delay: 0s; }
.project-card:nth-child(4) { transition-delay: 0s; }

/* Certification Cards Animation */
.cert-card {
    opacity: 1;
    transform: scale(1) rotateY(0deg);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.cert-card.in-view {
    opacity: 1;
    transform: scale(1) rotateY(0deg);
}

.cert-card:nth-child(1) { transition-delay: 0s; }
.cert-card:nth-child(2) { transition-delay: 0s; }
.cert-card:nth-child(3) { transition-delay: 0s; }

/* Skill Progress Animation */
.skill-progress {
    position: relative;
    overflow: hidden;
}

.skill-progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: shimmer 2s infinite;
}

/* Contact Form Focus Animation */
.form-group input:focus,
.form-group textarea:focus {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.scroll-indicator {
    animation: bounce 2s infinite;
}

/* Enhanced Social Links */
.social-link {
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--primary-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s, height 0.4s;
}

.social-link:hover::before {
    width: 100%;
    height: 100%;
}

.social-link i {
    position: relative;
    z-index: 1;
}

/* Stats Counter Animation Enhancement */
.stat-card {
    perspective: 1000px;
}

.stat-number {
    transform-style: preserve-3d;
    transition: transform 0.6s;
}

.stat-card:hover .stat-number {
    transform: rotateY(360deg);
}

/* Image Zoom on Hover */
.project-image {
    overflow: hidden;
}

.project-image img {
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover .project-image img {
    transform: scale(1.15) rotate(2deg);
}

/* Floating Labels Animation */
.form-group {
    position: relative;
}

.form-group label {
    transition: all var(--transition-base);
}

.form-group input:focus + label,
.form-group textarea:focus + label {
    transform: translateY(-5px);
    color: var(--primary-color);
}

/* Page Transition */
.page-transition {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    z-index: 9999;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s;
}

.page-transition.active {
    opacity: 1;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .navbar .container {
        padding: 1rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--text-white);
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        gap: 1rem;
        box-shadow: var(--shadow-xl);
        transition: var(--transition-base);
        z-index: 999;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero {
        padding: 6rem 0 3rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .timeline::before {
        left: 10px;
    }
    
    .timeline-item {
        padding-left: 2.5rem;
    }
    
    .timeline-marker {
        left: 0;
    }
    
    .projects-grid,
    .certifications-grid,
    .skills-container {
        grid-template-columns: 1fr;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .scroll-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-tag {
        font-size: 0.75rem;
        padding: 0.375rem 0.75rem;
    }
    
    .code-window {
        display: none;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .timeline-content {
        padding: 1.5rem;
    }
    
    .project-image,
    .project-card.featured .project-image {
        height: 200px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* ===================================
   PRINT STYLES
   =================================== */
@media print {
    .navbar,
    .hamburger,
    .scroll-top,
    .hero-visual,
    .scroll-indicator {
        display: none !important;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
    
    section {
        page-break-inside: avoid;
    }
}