/* ========================================
   Th7media - Personal Brand Website
   Minimalist Dark Mode Design
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Dark Mode */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a25;
    --color-bg-card: #161620;
    
    /* Text Colors */
    --color-text: #f0f0f5;
    --color-text-secondary: #a0a0b0;
    --color-text-muted: #6b6b7b;
    
    /* Accent Colors */
    --color-accent: #6366f1;
    --color-accent-light: #818cf8;
    --color-accent-dark: #4f46e5;
    --color-accent-glow: rgba(99, 102, 241, 0.3);
    
    /* Track Colors */
    --color-python: #3776ab;
    --color-html: #e34c26;
    --color-js: #f7df1e;
    
    /* Status Colors */
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    --gradient-hero: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* 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: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--color-accent-glow);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
}

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

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ========================================
   NAVIGATION
   ======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: var(--shadow-md);
}

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

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

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

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

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

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.05);
}

.nav-cta {
    background: var(--gradient-primary);
    color: white !important;
}

.nav-cta:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

/* Mobile Navigation */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

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

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

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

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

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

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-light {
    background: white;
    color: var(--color-bg);
}

.btn-light:hover {
    background: var(--color-text);
    transform: translateY(-2px);
}

.btn-submit {
    width: 100%;
    position: relative;
}

.btn-loading {
    display: none;
}

.btn.loading .btn-text,
.btn.loading .btn-icon {
    opacity: 0;
}

.btn.loading .btn-loading {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: absolute;
}

.spinner {
    animation: spin 1s linear infinite;
}

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

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(70px + var(--spacing-4xl)) var(--spacing-xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--color-accent);
    top: -200px;
    right: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--color-accent-dark);
    bottom: -150px;
    left: -100px;
    opacity: 0.2;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--color-accent-light);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.1;
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--color-success);
    margin-bottom: var(--spacing-xl);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.title-line {
    display: block;
}

.typewriter {
    color: var(--color-accent-light);
    min-height: 1.2em;
}

.cursor {
    animation: blink 1s infinite;
}

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

.hero-description {
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    color: var(--color-text-secondary);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-3xl);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.8rem;
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    margin: var(--spacing-sm) auto 0;
    position: relative;
}

.scroll-dot {
    width: 4px;
    height: 8px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(8px); opacity: 0.5; }
}

/* ========================================
   SECTIONS
   ======================================== */

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

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-accent-light);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
}

.section-description {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

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

/* Skills Section */
.skills-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.skill-card {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

.skill-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.skill-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: var(--spacing-lg);
}

.skill-card h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
}

/* Projects Section */
.projects-section {
    padding: var(--spacing-4xl) 0;
}

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

.projects-grid.large {
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
}

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

.project-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-icon {
    font-size: 4rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.9);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

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

.project-link {
    width: 44px;
    height: 44px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-bg);
    transition: all var(--transition-fast);
}

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

.project-info {
    padding: var(--spacing-lg);
}

.project-category {
    font-size: 0.75rem;
    color: var(--color-accent-light);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.project-title {
    font-size: 1.25rem;
    margin: var(--spacing-xs) 0 var(--spacing-sm);
}

.project-description {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tech-tag {
    font-size: 0.75rem;
    padding: 2px 8px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-accent-light);
    border-radius: var(--radius-sm);
}

/* Learning Preview Section */
.learning-preview {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
}

.learning-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.learning-content .section-title {
    text-align: left;
}

.learning-content .section-description {
    text-align: left;
    margin: 0 0 var(--spacing-xl);
}

.learning-features {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

.learning-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.learning-features svg {
    color: var(--color-success);
    flex-shrink: 0;
}

.learning-tracks {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.track-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.track-card:hover {
    border-color: var(--track-color);
    transform: translateX(8px);
}

.track-icon {
    width: 48px;
    height: 48px;
    background: var(--track-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.track-info {
    flex: 1;
}

.track-info h3 {
    font-size: 1.1rem;
    margin-bottom: 2px;
}

.track-info p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.track-arrow {
    color: var(--color-text-muted);
    transition: transform var(--transition-fast);
}

.track-card:hover .track-arrow {
    transform: translateX(4px);
    color: var(--track-color);
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-4xl) 0;
}

.cta-card {
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.cta-content h2 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.cta-content p {
    color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   PAGE HEADER
   ======================================== */

.page-header {
    padding: calc(70px + var(--spacing-3xl)) 0 var(--spacing-2xl);
    text-align: center;
}

.page-title {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: var(--spacing-md);
}

.page-description {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   PORTFOLIO PAGE
   ======================================== */

.portfolio-filter {
    padding-bottom: var(--spacing-xl);
}

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-fast);
}

.filter-tab:hover,
.filter-tab.active {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

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

/* Process Section */
.process-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-xl);
}

.process-step {
    text-align: center;
    padding: var(--spacing-xl);
}

.step-number {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.5;
    line-height: 1;
    margin-bottom: var(--spacing-md);
}

.process-step h3 {
    margin-bottom: var(--spacing-sm);
}

/* ========================================
   LEARNING LAB
   ======================================== */

.learning-header {
    background: var(--color-bg-secondary);
}

/* Progress Overview */
.progress-overview {
    padding: var(--spacing-xl) 0;
}

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

.progress-info h3 {
    margin-bottom: var(--spacing-xs);
}

.progress-info p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.progress-stats {
    display: flex;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

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

.progress-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
}

.progress-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.progress-bar-container {
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    width: 0%;
}

/* Learning Tracks Section */
.learning-tracks-section {
    padding: var(--spacing-4xl) 0;
}

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

.track-card-large {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

.track-card-large:hover {
    border-color: var(--track-color);
    transform: translateY(-4px);
}

.track-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.track-icon-large {
    width: 56px;
    height: 56px;
    background: var(--track-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.track-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.track-lessons {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.track-difficulty {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.track-title {
    font-size: 1.35rem;
    margin-bottom: var(--spacing-sm);
}

.track-description {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

.track-progress {
    margin-bottom: var(--spacing-lg);
}

.track-progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    margin-bottom: var(--spacing-sm);
}

.track-progress-value {
    color: var(--track-color);
    font-weight: 600;
}

.track-progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.track-progress-fill {
    height: 100%;
    background: var(--track-color);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    width: 0%;
}

.track-preview {
    margin-bottom: var(--spacing-lg);
}

.track-preview h4 {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.track-topics {
    list-style: none;
}

.track-topics li {
    font-size: 0.9rem;
    padding: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.track-topics li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--track-color);
    border-radius: 50%;
}

.more-topics {
    color: var(--color-text-muted) !important;
}

.more-topics::before {
    display: none !important;
}

.btn-track {
    width: 100%;
    background: var(--track-color);
    color: white;
}

.btn-track:hover {
    filter: brightness(1.1);
}

/* Playground Preview */
.playground-preview {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
}

.playground-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.playground-content .section-title {
    text-align: left;
}

.playground-content .section-description {
    text-align: left;
    margin: 0 0 var(--spacing-xl);
}

.playground-features {
    list-style: none;
}

.playground-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.playground-features svg {
    color: var(--color-success);
    flex-shrink: 0;
}

/* Code Window */
.code-window {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-lg);
}

.code-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.code-dots {
    display: flex;
    gap: 6px;
}

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

.code-dots span:nth-child(1) { background: #ff5f56; }
.code-dots span:nth-child(2) { background: #ffbd2e; }
.code-dots span:nth-child(3) { background: #27c93f; }

.code-filename {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-left: auto;
}

.code-content {
    padding: var(--spacing-md);
    overflow-x: auto;
}

.code-content pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
}

.code-content code {
    color: var(--color-text);
}

.code-comment { color: #6b7280; }
.code-keyword { color: #c084fc; }
.code-function { color: #60a5fa; }
.code-string { color: #4ade80; }

/* Tips Section */
.tips-section {
    padding: var(--spacing-4xl) 0;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.tip-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.tip-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.1);
}

.tip-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.tip-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

/* ========================================
   TRACK DETAIL PAGE
   ======================================== */

.track-hero {
    padding: calc(70px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.1) 0%, transparent 100%);
}

.track-breadcrumbs {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.track-breadcrumbs a {
    color: var(--color-accent-light);
}

.track-breadcrumbs a:hover {
    text-decoration: underline;
}

.track-hero-content {
    text-align: center;
}

.track-hero-icon {
    width: 80px;
    height: 80px;
    background: var(--track-color);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto var(--spacing-lg);
}

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

.track-hero-description {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

.track-hero-meta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* Track Progress Section */
.track-progress-section {
    padding: var(--spacing-xl) 0;
}

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

.track-progress-info h3 {
    margin-bottom: var(--spacing-xs);
}

.track-progress-info p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.track-progress-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.progress-fraction {
    color: var(--color-text-secondary);
}

.progress-percentage {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--track-color);
}

.track-progress-bar-large {
    height: 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.track-progress-fill-large {
    height: 100%;
    background: var(--track-color);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    width: 0%;
}

/* Lessons Section */
.lessons-section {
    padding: var(--spacing-xl) 0 var(--spacing-4xl);
}

.lessons-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.lesson-card {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    position: relative;
    transition: all var(--transition-base);
}

.lesson-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
}

.lesson-card.completed {
    border-color: var(--color-success);
}

.lesson-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.lesson-number {
    width: 36px;
    height: 36px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.9rem;
}

.lesson-card.completed .lesson-number {
    background: var(--color-success);
    color: white;
}

.lesson-status {
    margin-left: auto;
    color: var(--color-text-muted);
}

.lesson-status.completed {
    color: var(--color-success);
}

.lesson-status .status-icon.completed {
    display: none;
}

.lesson-status.completed .status-icon.pending {
    display: none;
}

.lesson-status.completed .status-icon.completed {
    display: block;
}

.lesson-content {
    margin-bottom: var(--spacing-md);
}

.lesson-difficulty {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.lesson-difficulty.beginner {
    background: rgba(34, 197, 94, 0.1);
    color: var(--color-success);
}

.lesson-difficulty.intermediate {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
}

.lesson-difficulty.advanced {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

.lesson-title {
    font-size: 1.15rem;
    margin: var(--spacing-sm) 0;
}

.lesson-description {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.lesson-duration {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.lesson-toggle {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 36px;
    height: 36px;
    background: var(--color-bg-tertiary);
    border: none;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lesson-toggle:hover {
    background: var(--color-bg);
}

.lesson-card.expanded .lesson-toggle svg {
    transform: rotate(180deg);
}

.lesson-expanded {
    display: none;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.lesson-card.expanded .lesson-expanded {
    display: block;
}

/* Code Snippet */
.code-snippet-container {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.code-snippet-container .code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.code-title {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.copy-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    background: var(--color-bg-card);
    color: var(--color-text);
}

.code-block {
    padding: var(--spacing-md);
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--color-text);
}

.lesson-actions {
    display: flex;
    justify-content: flex-end;
}

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

.btn-complete:hover {
    background: var(--color-bg);
    border-color: var(--color-success);
    color: var(--color-success);
}

.btn-complete.completed {
    background: var(--color-success);
    color: white;
    border-color: var(--color-success);
}

/* Other Tracks */
.other-tracks {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
}

.other-tracks-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.other-tracks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.other-track-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.other-track-card:hover {
    border-color: var(--track-color);
    transform: translateX(8px);
}

.other-track-icon {
    width: 48px;
    height: 48px;
    background: var(--track-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.other-track-info {
    flex: 1;
}

.other-track-info h4 {
    font-size: 1rem;
    margin-bottom: 2px;
}

.other-track-info p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.other-track-card > svg {
    color: var(--color-text-muted);
    transition: transform var(--transition-fast);
}

.other-track-card:hover > svg {
    transform: translateX(4px);
    color: var(--track-color);
}

/* ========================================
   CONTACT PAGE
   ======================================== */

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

.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--spacing-3xl);
}

/* Contact Form */
.contact-form-container {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
}

.required {
    color: var(--color-error);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem 1rem;
    background: var(--color-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236b6b7b' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
}

.form-group select option {
    background: var(--color-bg);
    color: var(--color-text);
}

/* Form Success */
.form-success {
    display: none;
    text-align: center;
    padding: var(--spacing-2xl);
}

.form-success.show {
    display: block;
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.success-icon {
    width: 80px;
    height: 80px;
    background: rgba(34, 197, 94, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    color: var(--color-success);
}

.form-success h3 {
    margin-bottom: var(--spacing-sm);
}

.form-success p {
    margin-bottom: var(--spacing-xl);
}

/* Contact Info */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.info-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.info-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.info-icon {
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent-light);
    flex-shrink: 0;
}

.info-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.info-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.info-content a {
    color: var(--color-text);
}

.info-content a:hover {
    color: var(--color-accent-light);
}

.services-list {
    list-style: none;
}

.services-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
}

.services-list svg {
    color: var(--color-success);
    flex-shrink: 0;
}

.social-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

/* FAQ Section */
.faq-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

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

.faq-item h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.faq-item p {
    font-size: 0.9rem;
}

/* ========================================
   ABOUT PAGE
   ======================================== */

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

.about-grid {
    display: grid;
    grid-template-columns: 0.4fr 0.6fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.about-image {
    position: relative;
}

.image-placeholder {
    aspect-ratio: 1;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-initial {
    font-size: 8rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.9);
}

.experience-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    background: var(--color-bg-card);
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
    min-width: 100px;
}

.badge-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
}

.badge-text {
    font-size: 0.7rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.about-content h2 {
    margin-bottom: var(--spacing-lg);
}

.about-content p {
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
}

.about-stats {
    display: flex;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

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

.about-stat .stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
}

.about-stat .stat-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* Skills Detail Section */
.skills-detail-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
}

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

.skill-detail-card {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.skill-detail-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: var(--spacing-lg);
}

.skill-detail-card h3 {
    margin-bottom: var(--spacing-sm);
}

.skill-detail-card > p {
    margin-bottom: var(--spacing-lg);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.skill-list li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
}

/* Tech Stack Section */
.tech-stack-section {
    padding: var(--spacing-4xl) 0;
}

.tech-categories {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.tech-category h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted);
}

.tech-items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tech-item {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.tech-item:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
}

/* Philosophy Section */
.philosophy-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
}

.philosophy-card {
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3xl);
}

.philosophy-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.philosophy-content .section-title {
    margin-bottom: var(--spacing-lg);
}

.philosophy-content blockquote {
    font-size: 1.25rem;
    font-style: italic;
    color: var(--color-text);
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg);
    border-left: 3px solid var(--color-accent);
    background: rgba(99, 102, 241, 0.05);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    text-align: left;
}

.principle h4 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.principle p {
    font-size: 0.9rem;
}

/* ========================================
   ERROR PAGES
   ======================================== */

.error-section {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4xl) var(--spacing-xl);
}

.error-content {
    text-align: center;
    max-width: 600px;
}

.error-code {
    font-family: var(--font-mono);
    font-size: 8rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--spacing-md);
}

.error-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.error-description {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xl);
}

.error-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.error-illustration {
    max-width: 400px;
    margin: 0 auto;
}

.error-code-block {
    text-align: left;
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: var(--spacing-md);
}

.footer-tagline {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

.footer-title {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

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

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

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

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

.footer-contact p {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.footer-cta {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.footer-cta:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ========================================
   SCROLL TO TOP
   ======================================== */

.scroll-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    background: var(--color-bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

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

.scroll-top:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    transform: translateY(-4px);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 1024px) {
    .learning-grid,
    .playground-grid,
    .contact-grid,
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .experience-badge {
        right: 10px;
        bottom: -10px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-item {
        width: 100%;
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-md);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-stats {
        gap: var(--spacing-xl);
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .projects-grid,
    .projects-grid.large {
        grid-template-columns: 1fr;
    }
    
    .tracks-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .error-code {
        font-size: 5rem;
    }
    
    .about-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .principles {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .filter-tabs {
        flex-direction: column;
    }
    
    .filter-tab {
        text-align: center;
    }
    
    .track-hero-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .error-actions {
        flex-direction: column;
    }
    
    .error-actions .btn {
        width: 100%;
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus styles */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-text: #ffffff;
        --color-text-secondary: #cccccc;
        --color-bg: #000000;
        --color-bg-card: #1a1a1a;
    }
}