/* =============================================================================
   Automative.eu - Modern Portfolio Styles
   A modern, responsive CSS with animations and dark/light theme support
   ============================================================================= */

/* =============================================================================
   CSS Custom Properties (Variables)
   ============================================================================= */
:root {
    /* Colors - Light Theme */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    
    /* Accent Colors */
    --color-accent-primary: #0ea5e9;
    --color-accent-secondary: #8b5cf6;
    --color-accent-tertiary: #06b6d4;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-accent-secondary) 100%);
    --gradient-text: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-accent-tertiary) 50%, var(--color-accent-secondary) 100%);
    --gradient-hero: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 40px rgb(14 165 233 / 0.3);
    
    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-Index Scale */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-loader: 500;
    
    /* Layout */
    --header-height: 4rem;
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #64748b;
    --color-border: #334155;
    --color-border-light: #1e293b;
    
    --gradient-hero: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.2);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.2);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.4);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

body.loading {
    overflow: hidden;
}

/* =============================================================================
   Loader
   ============================================================================= */
.loader {
    position: fixed;
    inset: 0;
    z-index: var(--z-loader);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-primary);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.loader-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent-primary);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
}

.loader-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

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

/* =============================================================================
   Typography
   ============================================================================= */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

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

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

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* =============================================================================
   Layout
   ============================================================================= */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--spacing-4xl) 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-subtitle {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
}

/* =============================================================================
   Buttons
   ============================================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

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

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

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

.btn-icon {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

/* =============================================================================
   Header & Navigation
   ============================================================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    height: var(--header-height);
    background: rgba(var(--color-bg-primary-rgb, 255, 255, 255), 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.8);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.logo-icon {
    font-size: var(--font-size-2xl);
}

.logo-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    position: relative;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) 0;
    transition: color var(--transition-fast);
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.theme-toggle {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    border-color: var(--color-accent-primary);
}

.theme-icon-light,
.theme-icon-dark {
    position: absolute;
    font-size: var(--font-size-lg);
    transition: opacity var(--transition-fast), transform var(--transition-base);
}

.theme-icon-dark {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .theme-icon-light {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="dark"] .theme-icon-dark {
    opacity: 1;
    transform: rotate(0);
}

.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
}

.hamburger {
    position: relative;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--color-text-primary);
    transition: transform var(--transition-base);
}

.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: translateY(8px) rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    transform: translateY(-8px) rotate(-45deg);
}

/* =============================================================================
   Hero Section
   ============================================================================= */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
}

.hero-gradient::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 100%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.15) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

.hero-gradient::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 80%;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
    animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, 30px) scale(1.1); }
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(var(--color-border-light) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border-light) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.5;
    mask-image: linear-gradient(180deg, transparent, black 20%, black 80%, transparent);
}

[data-theme="dark"] .hero-grid {
    opacity: 0.15;
}

.hero-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--color-accent-primary);
    border-radius: var(--radius-full);
    opacity: 0.6;
    animation: particle-float 10s ease-in-out infinite;
}

@keyframes particle-float {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.6; }
    50% { transform: translateY(-100px) scale(0.5); opacity: 0.3; }
}

.hero-content {
    position: relative;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease forwards;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: var(--radius-full);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    margin-bottom: var(--spacing-lg);
}

.title-line {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.6s ease 0.1s forwards;
    opacity: 0;
}

.title-name {
    display: block;
    font-size: clamp(var(--font-size-4xl), 8vw, var(--font-size-6xl));
    font-weight: 800;
    animation: fadeInUp 0.6s ease 0.2s forwards;
    opacity: 0;
}

.hero-tagline {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-2xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.3s forwards;
    opacity: 0;
}

.tagline-dynamic {
    color: var(--color-accent-primary);
    font-weight: 600;
}

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

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

.hero-description {
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.6s ease 0.4s forwards;
    opacity: 0;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
    animation: fadeInUp 0.6s ease 0.5s forwards;
    opacity: 0;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-3xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
    animation: fadeInUp 0.6s ease 0.6s forwards;
    opacity: 0;
}

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

.stat-number {
    display: block;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    animation: bounce 2s ease-in-out infinite;
}

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

/* =============================================================================
   About Section
   ============================================================================= */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.about-image {
    position: relative;
}

.image-wrapper {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-2xl);
    overflow: hidden;
}

.image-frame {
    position: absolute;
    inset: -10%;
    border: 2px solid var(--color-accent-primary);
    border-radius: var(--radius-2xl);
    transform: rotate(6deg);
    opacity: 0.3;
}

.image-placeholder {
    position: relative;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
}

.placeholder-icon {
    font-size: 8rem;
}

.experience-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100px;
    height: 100px;
    background: var(--color-bg-primary);
    border: 2px solid var(--color-accent-primary);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
}

.exp-number {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.exp-text {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-align: center;
    line-height: 1.2;
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

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

.about-highlights {
    display: grid;
    gap: var(--spacing-lg);
}

.highlight-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.highlight-item:hover {
    border-color: var(--color-accent-primary);
    transform: translateX(5px);
}

.highlight-icon {
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.highlight-content h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.highlight-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* =============================================================================
   Skills Section
   ============================================================================= */
.skills-filter {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.filter-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.skill-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-base);
    cursor: default;
}

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

.skill-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.skill-icon .tech-icon {
    width: 28px;
    height: 28px;
    object-fit: contain;
    transition: transform var(--transition-fast);
}

.skill-card:hover .tech-icon {
    transform: scale(1.1);
}

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

.skill-level {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: capitalize;
}

.skill-card[data-level="expert"] .skill-icon {
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.2), rgba(139, 92, 246, 0.2));
}

.skill-card[data-level="advanced"] .skill-icon {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(14, 165, 233, 0.2));
}

/* Skills Carousel */
.skills-carousel {
    position: relative;
    overflow: hidden;
    padding: var(--spacing-xl) 0;
    mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
}

.carousel-track {
    display: flex;
    gap: var(--spacing-lg);
    animation: scroll 30s linear infinite;
}

.carousel-track:hover {
    animation-play-state: paused;
}

@keyframes scroll {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

.carousel-item {
    flex-shrink: 0;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.carousel-item:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
}

/* =============================================================================
   Services Section
   ============================================================================= */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.service-card {
    position: relative;
    padding: var(--spacing-2xl);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

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

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    font-size: var(--font-size-2xl);
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.service-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.service-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.service-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.service-feature {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-accent-primary);
    background: rgba(14, 165, 233, 0.1);
    border-radius: var(--radius-full);
}

/* =============================================================================
   Contact Section
   ============================================================================= */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.contact-heading {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
}

.contact-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.contact-link:hover {
    border-color: var(--color-accent-primary);
    transform: translateX(5px);
}

.contact-link-icon {
    font-size: var(--font-size-xl);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.social-link .social-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
    transition: transform var(--transition-fast);
}

.social-link:hover .social-icon {
    transform: scale(1.15);
}

.social-link:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    transform: translateY(-3px);
}

.contact-card {
    position: relative;
    padding: var(--spacing-3xl);
    background: var(--gradient-primary);
    border-radius: var(--radius-2xl);
    color: white;
    overflow: hidden;
}

.card-decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.decoration-circle {
    position: absolute;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
}

.decoration-circle:first-child {
    width: 200px;
    height: 200px;
    top: -50px;
    right: -50px;
}

.decoration-circle:last-child {
    width: 150px;
    height: 150px;
    bottom: -30px;
    left: -30px;
}

.card-content {
    position: relative;
    text-align: center;
}

.card-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.card-content h4 {
    font-size: var(--font-size-xl);
    color: white;
    margin-bottom: var(--spacing-md);
}

.card-content p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xl);
}

.card-content .btn {
    background: white;
    color: var(--color-accent-primary);
}

.card-content .btn:hover {
    background: var(--color-bg-primary);
    color: var(--color-accent-primary);
}

/* =============================================================================
   Footer
   ============================================================================= */
.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
}

.footer-nav {
    display: flex;
    gap: var(--spacing-xl);
}

.footer-nav a {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.footer-credit {
    color: var(--color-text-muted);
}

/* =============================================================================
   Back to Top Button
   ============================================================================= */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-full);
    color: white;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* =============================================================================
   Responsive Design
   ============================================================================= */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-3xl);
    }
    
    .about-image {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-3xl);
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-4xl: 4rem;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        padding: var(--spacing-xl);
        background: var(--color-bg-primary);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-md);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
    
    .stat-item {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        text-align: left;
    }
    
    .stat-number {
        font-size: var(--font-size-3xl);
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: var(--spacing-md);
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .footer-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
    
    .skills-filter {
        gap: var(--spacing-xs);
    }
    
    .filter-btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: var(--font-size-xs);
    }
    
    .experience-badge {
        width: 80px;
        height: 80px;
        bottom: -10px;
        right: -10px;
    }
    
    .exp-number {
        font-size: var(--font-size-xl);
    }
}

/* =============================================================================
   Animation Classes
   ============================================================================= */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* Stagger children animation */
.stagger-children > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.4s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.5s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.6s; }

.stagger-children.visible > * {
    opacity: 1;
    transform: translateY(0);
}

/* =============================================================================
   Utility Classes
   ============================================================================= */
.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;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }