/* ===================================
   Gitcademy - Main Styles
   Modern, Interactive Git Learning
   Production-Ready Version 2.0
   =================================== */

/* ===== CSS Variables - Light Theme ===== */
:root {
    /* Primary Colors */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --primary-glow: rgba(99, 102, 241, 0.4);
    
    /* Accent Colors */
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;
    --accent-violet: #8b5cf6;
    
    /* Semantic Colors */
    --secondary-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #06b6d4;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-light: #ffffff;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0f172a;
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.7);
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-light: rgba(255, 255, 255, 0.1);
    
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.12);
    --shadow-2xl: 0 24px 48px rgba(0, 0, 0, 0.15);
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-glow: 0 0 20px var(--primary-glow);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --gradient-secondary: linear-gradient(135deg, #f472b6 0%, #f43f5e 100%);
    --gradient-success: linear-gradient(135deg, #06b6d4 0%, #10b981 100%);
    --gradient-warm: linear-gradient(135deg, #f59e0b 0%, #f43f5e 100%);
    --gradient-cool: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
    --gradient-dark: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    --gradient-mesh: 
        radial-gradient(at 40% 20%, hsla(259, 84%, 78%, 0.3) 0px, transparent 50%),
        radial-gradient(at 80% 0%, hsla(225, 84%, 70%, 0.3) 0px, transparent 50%),
        radial-gradient(at 0% 50%, hsla(339, 84%, 78%, 0.2) 0px, transparent 50%),
        radial-gradient(at 80% 50%, hsla(197, 84%, 70%, 0.2) 0px, transparent 50%),
        radial-gradient(at 0% 100%, hsla(259, 84%, 78%, 0.2) 0px, transparent 50%);
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-medium: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Z-index layers */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
}

/* ===== Dark Theme ===== */
[data-theme="dark"] {
    --primary-color: #818cf8;
    --primary-dark: #6366f1;
    --primary-light: #a5b4fc;
    --primary-glow: rgba(129, 140, 248, 0.4);
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-dark: #020617;
    --bg-card: rgba(30, 41, 59, 0.8);
    --bg-glass: rgba(15, 23, 42, 0.7);
    
    --border-color: #334155;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.6);
    
    --gradient-mesh: 
        radial-gradient(at 40% 20%, hsla(259, 84%, 40%, 0.3) 0px, transparent 50%),
        radial-gradient(at 80% 0%, hsla(225, 84%, 40%, 0.3) 0px, transparent 50%),
        radial-gradient(at 0% 50%, hsla(339, 84%, 40%, 0.2) 0px, transparent 50%),
        radial-gradient(at 80% 50%, hsla(197, 84%, 40%, 0.2) 0px, transparent 50%),
        radial-gradient(at 0% 100%, hsla(259, 84%, 40%, 0.2) 0px, transparent 50%);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    background-image: var(--gradient-mesh);
    background-attachment: fixed;
    overflow-x: hidden;
    transition: background-color var(--transition-medium), color var(--transition-medium);
}

/* Selection styling */
::selection {
    background-color: var(--primary-color);
    color: white;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
}

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

a:hover {
    color: var(--primary-dark);
}

code {
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', 'source-code-pro', monospace;
    background-color: var(--bg-tertiary);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
    color: var(--accent-rose);
    font-weight: 500;
}

/* Screen reader only */
.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;
}

/* ===== Container ===== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ===== Glass Morphism ===== */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: var(--z-fixed);
    transition: transform var(--transition-medium), background-color var(--transition-medium);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-4) var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.logo {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-1);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
    position: relative;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--bg-tertiary);
}

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

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-tertiary);
    border: none;
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    color: var(--text-primary);
    font-size: 1.25rem;
}

.theme-toggle:hover {
    background-color: var(--bg-card);
    transform: rotate(15deg);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    z-index: var(--z-fixed);
}

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

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Progress Bar ===== */
.progress-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--bg-tertiary);
    z-index: calc(var(--z-fixed) + 1);
}

.progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    transition: width var(--transition-fast);
    box-shadow: 0 0 10px var(--primary-glow);
}

/* ===== Main Content ===== */
.main-content {
    margin-top: 70px;
    min-height: calc(100vh - 70px);
}

.section {
    padding: var(--space-8) 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
    display: none;
}

.section.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-4);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--space-6);
    max-width: 600px;
    margin: 0 auto var(--space-6);
}

/* ===== Hero Section ===== */
.hero-section {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: var(--space-6) 0;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 80%, var(--primary-glow) 0%, transparent 25%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.3) 0%, transparent 25%),
        radial-gradient(circle at 40% 40%, rgba(6, 182, 212, 0.2) 0%, transparent 20%);
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
}

.hero-content {
    text-align: center;
    margin-bottom: var(--space-8);
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    margin-bottom: var(--space-4);
    line-height: 1.1;
    font-weight: 800;
}

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

.hero-subtitle {
    font-size: clamp(1rem, 1.75vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-xl);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-light);
    box-shadow: var(--shadow-md), 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 8px 30px var(--primary-glow);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-primary);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--text-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-small {
    padding: var(--space-2) var(--space-4);
    font-size: 0.875rem;
    border-radius: var(--radius-lg);
}

.btn-icon {
    font-size: 1.2rem;
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: translateX(3px);
}

/* ===== Hero Visual Animation ===== */
.hero-visual {
    margin: var(--space-6) 0;
    display: flex;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.git-flow-animation {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    padding: var(--space-8);
}

.git-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
}

.git-node-1 { animation-delay: 0.2s; }
.git-node-2 { animation-delay: 0.4s; }
.git-node-3 { animation-delay: 0.6s; }

.node-circle {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: var(--gradient-primary);
    box-shadow: var(--shadow-lg), 0 0 30px var(--primary-glow);
    animation: pulse 2s infinite, float 3s ease-in-out infinite;
    display: flex;
    align-items: center;
    justify-content: center;
}

.node-circle::after {
    content: '';
    width: 30px;
    height: 30px;
    background: white;
    border-radius: 50%;
    opacity: 0.3;
}

.node-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.git-connection {
    width: 80px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    animation: expandWidth 0.5s ease forwards;
    transform-origin: left;
    transform: scaleX(0);
    box-shadow: 0 0 10px var(--primary-glow);
}

.git-connection-1 { animation-delay: 0.3s; }
.git-connection-2 { animation-delay: 0.5s; }

/* ===== Features Grid ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.feature-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--space-5);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-3);
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

.feature-card:nth-child(2) .feature-icon { animation-delay: 0.5s; }
.feature-card:nth-child(3) .feature-icon { animation-delay: 1s; }
.feature-card:nth-child(4) .feature-icon { animation-delay: 1.5s; }

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* ===== Content Grid ===== */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-5);
    margin-top: var(--space-6);
}

/* ===== Lesson Cards ===== */
.lesson-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all var(--transition-medium);
}

.lesson-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.lesson-card.full-width {
    grid-column: 1 / -1;
}

.lesson-header {
    padding: var(--space-5) var(--space-6);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.lesson-header h3 {
    margin-bottom: 0;
    font-size: 1.375rem;
}

.lesson-badge {
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.lesson-content {
    padding: var(--space-6);
}

/* ===== Key Points ===== */
.key-points {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.key-point {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    color: var(--success-color);
    font-weight: 600;
    border: 1px solid rgba(16, 185, 129, 0.2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ===== Visual Boxes ===== */
.visual-box {
    background: var(--bg-tertiary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    margin-top: var(--space-4);
    border: 1px solid var(--border-color);
}

.repo-diagram {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.repo-layer {
    background: var(--bg-primary);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
    position: relative;
    transition: all var(--transition-fast);
}

.repo-layer:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.layer-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.layer-content {
    margin-top: var(--space-2);
    color: var(--text-secondary);
}

/* ===== Commands Grid ===== */
.commands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.command-item {
    background: var(--bg-tertiary);
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.command-item::after {
    content: '📋';
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.command-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.command-item:hover::after {
    opacity: 1;
}

.command-code {
    display: block;
    background: var(--bg-dark);
    color: var(--accent-emerald);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    margin-bottom: var(--space-3);
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
}

.command-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.command-demo {
    margin-top: var(--space-3);
    padding: var(--space-3);
    background: var(--bg-dark);
    border-radius: var(--radius-lg);
    animation: slideDown var(--transition-fast);
}

.demo-output {
    color: var(--accent-emerald);
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 0.85rem;
}

/* ===== Command List ===== */
.command-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.command-item-simple {
    padding: var(--space-4);
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-fast);
}

.command-item-simple:hover {
    transform: translateX(4px);
    background: var(--bg-card);
}

.command-item-simple code {
    display: block;
    margin-bottom: var(--space-2);
    background: var(--bg-dark);
    color: var(--accent-emerald);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
}

.command-item-simple p {
    margin-bottom: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== Workflow Interactive ===== */
.workflow-interactive {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-6);
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    flex-wrap: wrap;
    border: 1px solid var(--border-color);
}

.workflow-stage {
    flex: 1;
    min-width: 160px;
    background: var(--bg-primary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-color);
    transition: all var(--transition-fast);
}

.workflow-stage:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.stage-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-3);
}

.workflow-stage h4 {
    font-size: 1rem;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.stage-files,
.commit-history {
    min-height: 100px;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.file-item {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    cursor: move;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 0.875rem;
}

.file-item:hover {
    background: var(--gradient-primary);
    color: var(--text-light);
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.commit-item {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    border-left: 3px solid var(--success-color);
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
}

.workflow-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.arrow-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.workflow-controls {
    margin-top: var(--space-4);
    text-align: center;
}

.workflow-hint {
    margin-top: var(--space-4);
    color: var(--text-secondary);
    font-style: italic;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

/* ===== Branch Visualization ===== */
.branch-visualization,
.branch-svg {
    width: 100%;
    max-width: 400px;
    margin: var(--space-4) auto;
}

/* ===== Branch Simulator ===== */
.branch-simulator {
    background: var(--bg-tertiary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.simulator-canvas {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    min-height: 400px;
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow-inner);
    border: 1px solid var(--border-color);
}

#branchSvg {
    width: 100%;
    height: 400px;
}

.simulator-controls {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: var(--space-4);
}

.simulator-info {
    display: flex;
    gap: var(--space-8);
    justify-content: center;
    flex-wrap: wrap;
}

.simulator-info p {
    margin-bottom: 0;
    color: var(--text-secondary);
}

.branch-tag {
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.875rem;
}

/* ===== Merge Comparison ===== */
.merge-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 1rem;
}

.merge-type {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
}

.merge-type h4 {
    text-align: center;
    margin-bottom: 1rem;
}

.merge-visual {
    margin: 1rem 0;
}

.merge-svg,
.rebase-svg,
.cherrypick-svg,
.tags-svg,
.comparison-svg {
    width: 100%;
    height: auto;
}

.merge-desc {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== Conflict Demo ===== */
.conflict-demo {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1rem;
    align-items: center;
    margin: 2rem 0;
}

.code-block {
    background-color: var(--bg-dark);
    border-radius: 8px;
    overflow: hidden;
}

.code-header {
    background-color: rgba(255,255,255,0.1);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

.code-block pre {
    padding: 1rem;
    margin: 0;
    overflow-x: auto;
}

.code-block code {
    background: none;
    color: #fff;
    padding: 0;
}

.conflict-block code {
    color: #ff9800;
}

.resolved-block code {
    color: #4caf50;
}

.resolution-arrow {
    font-size: 2rem;
    color: var(--primary-color);
}

.conflict-steps {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 2rem;
}

.step {
    background-color: var(--bg-secondary);
    padding: 0.8rem 1.2rem;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 2px solid var(--primary-light);
}

/* ===== Rebase Visual ===== */
.rebase-visual {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin: 1rem 0;
}

.visual-section h5 {
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.command-example {
    text-align: center;
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: 8px;
}

.command-example code {
    display: block;
    background-color: var(--bg-dark);
    color: #4caf50;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
}

.command-example p {
    margin-bottom: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== Cherry Pick & Stash ===== */
.cherrypick-visual,
.stash-visual {
    margin: 1rem 0;
}

.stash-stack {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stash-item {
    background-color: var(--bg-primary);
    padding: 0.8rem;
    border-radius: 4px;
    border-left: 4px solid var(--warning-color);
    font-family: monospace;
    font-size: 0.9rem;
}

/* ===== Tags Visual ===== */
.tags-visual {
    margin: 1rem 0;
}

/* ===== Comparison Grid ===== */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.comparison-item {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
}

.comparison-item h4 {
    text-align: center;
    margin-bottom: 1rem;
}

.comparison-desc {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.reset-visual,
.revert-visual {
    margin: 1rem 0;
}

.warning {
    color: var(--warning-color);
    text-align: center;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.success {
    color: var(--success-color);
    text-align: center;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* ===== Remote Diagram ===== */
.remote-diagram {
    padding: 2rem;
    background-color: var(--bg-secondary);
    border-radius: 8px;
}

.remote-section {
    display: flex;
    align-items: center;
    justify-content: space-around;
    gap: 2rem;
    flex-wrap: wrap;
}

.remote-box {
    flex: 1;
    min-width: 200px;
    padding: 2rem;
    background-color: var(--bg-primary);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.remote-box h4 {
    margin-bottom: 1rem;
}

.remote-content {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.commit-dot {
    width: 12px;
    height: 12px;
    background: var(--gradient-primary);
    border-radius: 50%;
}

.remote-arrows {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.arrow-up,
.arrow-down {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.arrow-up span,
.arrow-down span {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.arrow-line {
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* ===== Simulator Section ===== */
.simulator-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.simulator-main {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.terminal-window {
    background: var(--bg-dark);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.terminal-header {
    background: linear-gradient(180deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.03) 100%);
    padding: var(--space-3) var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.terminal-buttons {
    display: flex;
    gap: var(--space-2);
}

.btn-close,
.btn-minimize,
.btn-maximize {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    transition: transform var(--transition-fast);
}

.btn-close:hover,
.btn-minimize:hover,
.btn-maximize:hover {
    transform: scale(1.1);
}

.btn-close { background-color: #ff5f56; }
.btn-minimize { background-color: #ffbd2e; }
.btn-maximize { background-color: #27c93f; }

.terminal-title {
    color: var(--text-light);
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.8;
}

.terminal-body {
    padding: var(--space-4);
    min-height: 400px;
    max-height: 600px;
    overflow-y: auto;
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
}

.terminal-output {
    margin-bottom: var(--space-4);
}

.terminal-line {
    color: var(--accent-emerald);
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    margin-bottom: var(--space-1);
    line-height: 1.5;
    font-size: 0.875rem;
}

.terminal-command { color: #fff; }
.terminal-success { color: var(--accent-emerald); }
.terminal-error { color: var(--accent-rose); }
.terminal-warning { color: var(--accent-amber); }
.terminal-info { color: var(--accent-cyan); }

.terminal-input-line {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.terminal-prompt {
    color: var(--accent-emerald);
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-weight: 700;
}

.terminal-input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-light);
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 0.875rem;
    outline: none;
    caret-color: var(--accent-emerald);
}

.terminal-input::placeholder {
    color: rgba(255,255,255,0.3);
}

/* ===== Simulator Visualization ===== */
.simulator-visualization {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.viz-header {
    padding: var(--space-4);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.viz-header h3 {
    margin-bottom: 0;
    font-size: 1.125rem;
}

.viz-body {
    padding: var(--space-4);
    min-height: 400px;
}

#repoCanvas {
    width: 100%;
    height: 400px;
    display: block;
}

.viz-info {
    padding: var(--space-4);
    background: var(--bg-tertiary);
    display: flex;
    gap: var(--space-6);
    flex-wrap: wrap;
    border-top: 1px solid var(--border-color);
}

.info-item {
    display: flex;
    gap: var(--space-2);
}

.info-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.info-value {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.875rem;
}

/* ===== Simulator Sidebar ===== */
.simulator-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.sidebar-section {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--space-5);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.sidebar-section h3 {
    font-size: 1rem;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.quick-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.quick-actions .btn {
    justify-content: flex-start;
}

.file-tree {
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 0.875rem;
}

.file-tree-item {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.file-tree-item:hover {
    background: var(--bg-tertiary);
}

.folder-icon {
    margin-right: var(--space-2);
}

.command-history {
    max-height: 200px;
    overflow-y: auto;
    font-family: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 0.8rem;
}

.history-empty {
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    padding: var(--space-4);
}

/* ===== Cheat Sheet ===== */
.cheatsheet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.cheatsheet-category {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--space-6);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-medium);
}

.cheatsheet-category:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.category-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.cheat-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.cheat-item {
    padding: var(--space-4);
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.cheat-item:hover {
    transform: translateX(4px);
    background: var(--bg-card);
    box-shadow: var(--shadow-md);
}

.cheat-item code {
    display: block;
    background: var(--bg-dark);
    color: var(--accent-emerald);
    padding: var(--space-3);
    margin-bottom: var(--space-2);
    border-radius: var(--radius-lg);
    font-size: 0.8rem;
}

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

/* ===== Tips Section ===== */
.tips-section {
    margin-top: var(--space-12);
    padding: var(--space-10);
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-color);
}

.tips-section h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: var(--space-8);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
}

.tip-card {
    background: var(--bg-tertiary);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    border-left: 4px solid var(--success-color);
    transition: all var(--transition-fast);
}

.tip-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.tip-card h4 {
    font-size: 1.1rem;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.tip-card p {
    margin-bottom: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--space-16) 0 var(--space-6);
    margin-top: var(--space-16);
    position: relative;
    overflow: hidden;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-section h4 {
    margin-bottom: var(--space-4);
    font-size: 1.125rem;
    color: var(--text-light);
}

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

.footer-section li {
    margin-bottom: var(--space-2);
}

.footer-section a {
    color: rgba(255,255,255,0.7);
    transition: all var(--transition-fast);
}

.footer-section a:hover {
    color: var(--text-light);
    padding-left: var(--space-2);
}

.footer-note {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.5);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-6);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p {
    margin-bottom: 0;
    color: rgba(255,255,255,0.5);
}

/* ===== Responsive Design ===== */
@media (max-width: 1200px) {
    .content-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
    
    .cheatsheet-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 1024px) {
    .simulator-container {
        grid-template-columns: 1fr;
    }
    
    .conflict-demo {
        grid-template-columns: 1fr;
    }
    
    .resolution-arrow {
        transform: rotate(90deg);
    }
    
    .content-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .section {
        padding: var(--space-6) 0;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        flex-direction: column;
        background: var(--bg-glass);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: var(--space-4);
        box-shadow: var(--shadow-xl);
        transition: left var(--transition-medium);
        gap: var(--space-2);
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: clamp(1.75rem, 7vw, 2.5rem);
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .content-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .workflow-interactive {
        flex-direction: column;
        padding: var(--space-4);
    }

    .workflow-arrow {
        transform: rotate(90deg);
    }

    .remote-section {
        flex-direction: column;
    }

    .arrow-up .arrow-line,
    .arrow-down .arrow-line {
        transform: rotate(90deg);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }
    
    .feature-card {
        padding: var(--space-4);
    }
    
    .feature-icon {
        font-size: 2rem;
    }

    .cheatsheet-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }
    
    .stat-card {
        padding: var(--space-4);
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .lesson-content {
        padding: var(--space-4);
    }
    
    .lesson-header {
        padding: var(--space-3) var(--space-4);
    }
    
    .commands-grid {
        grid-template-columns: 1fr;
    }
    
    .badges-container {
        gap: var(--space-3);
    }
    
    .badge {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-3);
    }
    
    .section {
        padding: var(--space-4) 0;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
        gap: var(--space-2);
    }

    .btn {
        width: 100%;
        justify-content: center;
        padding: var(--space-3) var(--space-4);
    }

    .git-flow-animation {
        flex-direction: column;
        gap: var(--space-3);
        padding: var(--space-4);
    }

    .git-connection {
        width: 4px;
        height: 40px;
        transform: scaleY(0);
        animation: expandHeight 0.5s ease forwards;
    }

    .node-circle {
        width: 50px;
        height: 50px;
    }

    .key-points {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .section-subtitle {
        font-size: 0.95rem;
    }
    
    .merge-comparison {
        grid-template-columns: 1fr;
    }
    
    .rebase-visual {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .comparison-grid {
        grid-template-columns: 1fr;
    }
    
    .quiz-card {
        padding: var(--space-4);
    }
    
    .quiz-question {
        font-size: 1rem;
    }
}

/* ===== Animation Float Keyframe ===== */
@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-10px) rotate(1deg);
    }
}

/* ===== Print Styles ===== */
@media print {
    .navbar,
    .progress-container,
    .theme-toggle,
    .nav-toggle,
    .workflow-controls,
    .simulator-controls,
    .quick-actions {
        display: none !important;
    }

    .section {
        display: block !important;
        opacity: 1 !important;
        transform: none !important;
        page-break-inside: avoid;
    }

    body {
        background: white;
        color: black;
    }
}

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

/* ===== Focus Styles ===== */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ===== Quiz Section ===== */
.quiz-container {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-color);
    padding: var(--space-8);
    margin-bottom: var(--space-6);
}

.quiz-progress {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.quiz-progress-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    transition: all var(--transition-fast);
}

.quiz-progress-dot.active {
    background: var(--gradient-primary);
    box-shadow: 0 0 10px var(--primary-glow);
}

.quiz-progress-dot.correct {
    background: var(--success-color);
}

.quiz-progress-dot.incorrect {
    background: var(--error-color);
}

.quiz-question {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-6);
    color: var(--text-primary);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.quiz-option {
    padding: var(--space-4);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.quiz-option:hover {
    border-color: var(--primary-color);
    background: var(--bg-card);
    transform: translateX(4px);
}

.quiz-option.selected {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.quiz-option.correct {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.quiz-option.incorrect {
    border-color: var(--error-color);
    background: rgba(239, 68, 68, 0.1);
}

.quiz-option-letter {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

.quiz-option.selected .quiz-option-letter {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
}

.quiz-result {
    text-align: center;
    padding: var(--space-8);
}

.quiz-score {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Achievement Badges ===== */
.badges-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    justify-content: center;
    margin: var(--space-8) 0;
}

.badge {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    position: relative;
    transition: all var(--transition-medium);
    border: 3px solid var(--border-color);
}

.badge.earned {
    background: var(--gradient-primary);
    border-color: transparent;
    box-shadow: 0 0 20px var(--primary-glow);
    animation: badgeEarn 0.5s ease;
}

.badge.locked {
    opacity: 0.5;
    filter: grayscale(100%);
}

.badge:hover {
    transform: scale(1.1) rotate(5deg);
}

.badge-tooltip {
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.badge:hover .badge-tooltip {
    opacity: 1;
}

@keyframes badgeEarn {
    0% {
        transform: scale(0) rotate(-180deg);
    }
    50% {
        transform: scale(1.2) rotate(10deg);
    }
    100% {
        transform: scale(1) rotate(0);
    }
}

/* ===== Confetti ===== */
.confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    opacity: 0;
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-tooltip);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.toast {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    animation: slideInRight 0.3s ease;
    max-width: 350px;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.info {
    border-left: 4px solid var(--info-color);
}

/* ===== Flowchart Styles ===== */
.flowchart-container {
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    overflow-x: auto;
    border: 1px solid var(--border-color);
}

.flowchart {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    min-width: max-content;
    padding: var(--space-4);
}

.flowchart-node {
    background: var(--bg-primary);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-xl);
    border: 2px solid var(--border-color);
    text-align: center;
    min-width: 120px;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.flowchart-node:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.flowchart-node.active {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.flowchart-node.highlighted {
    animation: nodeHighlight 1s ease infinite;
}

@keyframes nodeHighlight {
    0%, 100% {
        box-shadow: 0 0 0 0 var(--primary-glow);
    }
    50% {
        box-shadow: 0 0 0 10px transparent;
    }
}

.flowchart-arrow {
    font-size: 1.5rem;
    color: var(--primary-color);
    animation: arrowPulse 1.5s ease infinite;
}

@keyframes arrowPulse {
    0%, 100% {
        opacity: 1;
        transform: translateX(0);
    }
    50% {
        opacity: 0.5;
        transform: translateX(5px);
    }
}

/* ===== Interactive Tutorial Steps ===== */
.tutorial-steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.tutorial-step {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.tutorial-step:hover {
    background: var(--bg-card);
    transform: translateX(4px);
}

.tutorial-step.completed {
    border-left: 4px solid var(--success-color);
}

.tutorial-step.active {
    border-left: 4px solid var(--primary-color);
    background: var(--bg-card);
}

.step-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-secondary);
    flex-shrink: 0;
    border: 2px solid var(--border-color);
}

.tutorial-step.completed .step-number {
    background: var(--success-color);
    color: white;
    border-color: transparent;
}

.tutorial-step.active .step-number {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
}

.step-content h4 {
    margin-bottom: var(--space-1);
    font-size: 1rem;
}

.step-content p {
    margin-bottom: 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===== Loading States ===== */
.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-lg);
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* ===== Empty States ===== */
.empty-state {
    text-align: center;
    padding: var(--space-12);
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

/* ===== Stats Cards ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
    margin: var(--space-8) 0;
}

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: var(--space-1);
}

/* ===== Scenario Cards ===== */
.scenario-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all var(--transition-medium);
}

.scenario-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.scenario-header {
    padding: var(--space-4) var(--space-6);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.scenario-icon {
    font-size: 1.5rem;
}

.scenario-title {
    font-weight: 600;
    margin: 0;
}

.scenario-difficulty {
    margin-left: auto;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.scenario-difficulty.easy {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

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

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

.scenario-body {
    padding: var(--space-6);
}

.scenario-description {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

/* ===== Search Input ===== */
.search-container {
    position: relative;
    max-width: 400px;
    margin: 0 auto var(--space-8);
}

.search-input {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    padding-left: var(--space-12);
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 1rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.search-icon {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.25rem;
}

/* ===== Tabs ===== */
.tabs-container {
    margin-bottom: var(--space-6);
}

.tabs-nav {
    display: flex;
    gap: var(--space-1);
    background: var(--bg-tertiary);
    padding: var(--space-1);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-6);
}

.tab-btn {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--bg-primary);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* ===== Copy Button for Code Snippets ===== */
.code-container {
    position: relative;
}

.copy-btn {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    z-index: 10;
}

.code-container:hover .copy-btn,
.command-item:hover .copy-btn,
.cheat-item:hover .copy-btn,
.command-item-simple:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

.copy-btn.copied {
    background: var(--success-color);
    border-color: var(--success-color);
}

.command-item,
.cheat-item,
.command-item-simple {
    position: relative;
}

/* ===== Enhanced Command Items ===== */
.command-item .copy-btn,
.cheat-item .copy-btn,
.command-item-simple .copy-btn {
    top: var(--space-3);
    right: var(--space-3);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.command-item .copy-btn:hover,
.cheat-item .copy-btn:hover,
.command-item-simple .copy-btn:hover {
    background: var(--primary-color);
    color: var(--text-light);
    border-color: var(--primary-color);
}

/* ===== Enhanced Diagrams ===== */
.diagram-container {
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    margin: var(--space-4) 0;
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

.diagram-container svg {
    width: 100%;
    height: auto;
    min-height: 120px;
}

/* Enhanced SVG text for dark mode */
[data-theme="dark"] .branch-svg text,
[data-theme="dark"] .merge-svg text,
[data-theme="dark"] .rebase-svg text,
[data-theme="dark"] .tags-svg text,
[data-theme="dark"] .cherrypick-svg text,
[data-theme="dark"] .comparison-svg text {
    fill: #94a3b8;
}

/* ===== Explanation Box ===== */
.explanation-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin: var(--space-4) 0;
}

.explanation-box h4 {
    color: var(--primary-color);
    font-size: 0.9rem;
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.explanation-box p {
    margin-bottom: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Tip Box ===== */
.tip-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-left: 4px solid var(--success-color);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    margin: var(--space-3) 0;
    font-size: 0.875rem;
}

.tip-box::before {
    content: "💡 ";
}

/* ===== Warning Box ===== */
.warning-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05) 0%, rgba(239, 68, 68, 0.05) 100%);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-left: 4px solid var(--warning-color);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    margin: var(--space-3) 0;
    font-size: 0.875rem;
}

.warning-box::before {
    content: "⚠️ ";
}