/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Primary Colors */
    --primary-blue: #0052cc;
    --light-blue: #4da6ff;
    --cyan: #0099cc;
    --dark-blue: #002952;
    
    /* Accent Colors */
    --electric-blue: #0073e6;
    --neon-cyan: #00ccff;
    --bright-purple: #7a1f99;
    --electric-green: #00dd77;
    
    /* Neutral Colors */
    --white: #ffffff;
    --light-gray: #f8fafc;
    --gray: #64748b;
    --dark-gray: #334155;
    --dark: #1e293b;
      /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 50%, var(--cyan) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--electric-blue) 0%, var(--bright-purple) 100%);
    --gradient-accent: linear-gradient(135deg, var(--neon-cyan) 0%, var(--electric-green) 100%);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-neon: 0 0 20px rgba(0, 212, 255, 0.3);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
    scroll-behavior: smooth;
    overflow-x: hidden;
}

/* Utility Classes */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.text-center { text-align: center; }
.text-white { color: var(--white); }
.bg-light { background-color: var(--light-gray); }
.bg-gradient { background: var(--gradient-primary); }

.gradient-text {
    display: inline-block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 102, 255, 0.1);
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-6) var(--spacing-4);
    max-width: 1200px;
    margin: 0 auto;
    min-height: 80px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-blue);
}

.nav-brand i {
    font-size: var(--font-size-3xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-logo {
    width: 2.5rem;
    height: 2.5rem;
    object-fit: contain;
    transition: var(--transition-fast);
    filter: drop-shadow(0 2px 4px rgba(0, 102, 255, 0.2));
}

.nav-logo:hover {
    transform: scale(1.1);
    filter: drop-shadow(0 4px 8px rgba(0, 102, 255, 0.3));
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-10);
}

.nav-link {
    text-decoration: none;
    color: var(--dark-gray);
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
    position: relative;
    padding: var(--spacing-2) var(--spacing-1);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--gradient-primary);
    transition: var(--transition-fast);
    border-radius: var(--radius-full);
}

.nav-link:hover {
    color: var(--primary-blue);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: var(--spacing-2);
}

.hamburger span {
    width: 28px;
    height: 4px;
    background: var(--primary-blue);
    transition: var(--transition-fast);
    border-radius: var(--radius-sm);
}

/* Hamburger animation when active */
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: var(--spacing-20) 0;
    padding-top: 120px;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-6);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease-out;
}

.hero-title.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--gray);
    margin-bottom: var(--spacing-8);
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: var(--transition-normal);
    border: none;
    cursor: pointer;
}

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

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

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

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

.btn-github {
    background: var(--dark);
    color: var(--white);
}

.btn-github:hover {
    background: var(--dark-gray);
    transform: translateY(-2px);
}

.hero-visual {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
    position: relative;
}

.floating-card {
    background: var(--white);
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid rgba(0, 102, 255, 0.1);
}

.floating-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.floating-card:nth-child(1) {
    animation: float 6s ease-in-out infinite;
}

.floating-card:nth-child(2) {
    animation: float 6s ease-in-out infinite 2s;
}

.floating-card:nth-child(3) {
    animation: float 6s ease-in-out infinite 4s;
}

.floating-card i {
    font-size: var(--font-size-3xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-3);
}

.floating-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.floating-card p {
    color: var(--gray);
    font-size: var(--font-size-sm);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    animation: float 8s ease-in-out infinite;
}

.orb-1 {
    width: 300px;
    height: 300px;
    background: var(--gradient-primary);
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 200px;
    height: 200px;
    background: var(--gradient-accent);
    bottom: 20%;
    left: 10%;
    animation-delay: 2s;
}

.orb-3 {
    width: 150px;
    height: 150px;
    background: var(--gradient-secondary);
    top: 50%;
    left: 50%;
    animation-delay: 4s;
}

/* Sections */
.section {
    padding: var(--spacing-20) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-16);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-4);
}

.section-subtitle {
    font-size: var(--font-size-xl);
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

/* Overview Section */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
    margin-top: var(--spacing-16);
}

.overview-card {
    background: var(--white);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid rgba(0, 102, 255, 0.1);
}

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

.card-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-6);
}

.card-icon i {
    font-size: var(--font-size-2xl);
    color: var(--white);
}

.overview-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.overview-card p {
    color: var(--gray);
    line-height: 1.7;
}

/* AI Features Section */
.ai-features-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-12);
    margin-bottom: var(--spacing-16);
}

.ai-feature-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-6);
}

.feature-icon i {
    font-size: var(--font-size-2xl);
    color: var(--white);
}

.ai-feature-card h3 {
    color: var(--white);
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.ai-feature-card p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
    margin-bottom: var(--spacing-6);
}

.feature-process {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

.process-step {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-lg);
}

.step-number {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    background: var(--white);
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.step-text {
    color: var(--white);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.feature-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.highlight {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--white);
}

.highlight i {
    color: var(--electric-green);
}

/* Video Demo Styles */
.video-demo {
    margin: var(--spacing-6) 0;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    padding: var(--spacing-5);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.video-container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 63%; /* 3:2 aspect ratio (2160x1440) */
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.video-container video:hover {
    transform: scale(1.02);
}

.video-caption {
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-sm);
    font-style: italic;
    margin-top: var(--spacing-3);
    margin-bottom: 0;
}

.ai-workflow {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.ai-workflow h3 {
    color: var(--white);
    font-size: var(--font-size-2xl);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.workflow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-6);
    flex-wrap: wrap;
}

.workflow-step {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    text-align: center;
    max-width: 250px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.step-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-4);
}

.step-icon i {
    font-size: var(--font-size-xl);
    color: var(--primary-blue);
}

.workflow-step h4 {
    color: var(--white);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.workflow-step p {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.workflow-arrow {
    color: var(--white);
    font-size: var(--font-size-xl);
}

/* Technology Section */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-16);
}

.tech-card {
    background: var(--white);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid rgba(0, 102, 255, 0.1);
}

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

.tech-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-6);
}

.tech-icon.python {
    background: linear-gradient(135deg, #3776ab 0%, #ffd343 100%);
}

.tech-icon.java {
    background: linear-gradient(135deg, #ed8b00 0%, #5382a1 100%);
}

.tech-icon.communication {
    background: var(--gradient-secondary);
}

.tech-icon i {
    font-size: var(--font-size-2xl);
    color: var(--white);
}

.tech-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.tech-card p {
    color: var(--gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-2);
}

.tech-features {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
    justify-content: center;
    margin-top: var(--spacing-4);
}

.tech-tag {
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.architecture-diagram {
    background: var(--light-gray);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    text-align: center;
}

.architecture-diagram h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-6);
}

.diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-6);
    flex-wrap: wrap;
}

.diagram-component {
    background: var(--white);
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    min-width: 200px;
    border: 1px solid rgba(0, 102, 255, 0.1);
}

.diagram-component i {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-3);
}

.diagram-component.frontend i {
    color: var(--electric-blue);
}

.diagram-component.backend-java i {
    color: #ed8b00;
}

.diagram-component.backend-python i {
    color: #3776ab;
}

.diagram-component h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.diagram-component p {
    color: var(--gray);
    font-size: var(--font-size-sm);
}

.diagram-arrow {
    color: var(--primary-blue);
    font-size: var(--font-size-xl);
}

/* Setup Section */
.setup-content {
    max-width: 800px;
    margin: 0 auto;
}

.github-section {
    margin-bottom: var(--spacing-16);
}

.github-card {
    background: var(--white);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    border: 1px solid rgba(0, 102, 255, 0.1);
}

.github-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: var(--dark);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-6);
}

.github-icon i {
    font-size: var(--font-size-2xl);
    color: var(--white);
}

.github-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.github-card p {
    color: var(--gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-6);
}

.setup-steps {
    margin-bottom: var(--spacing-16);
}

.setup-step {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-8);
    overflow: hidden;
    border: 1px solid rgba(0, 102, 255, 0.1);
}

.step-header {
    background: var(--gradient-primary);
    padding: var(--spacing-6);
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.step-header .step-number {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--white);
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.step-header h3 {
    color: var(--white);
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.step-content {
    padding: var(--spacing-6);
}

.step-content p {
    color: var(--gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-4);
}

.code-block {
    background: var(--dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    margin: var(--spacing-4) 0;
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
    font-family: 'Fira Code', 'Monaco', 'Consolas', monospace;
}

.code-block code {
    color: var(--electric-green);
    font-size: var(--font-size-sm);
}

.setup-instructions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.instruction {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3);
    background: var(--light-gray);
    border-radius: var(--radius-lg);
}

.instruction i {
    color: var(--primary-blue);
    font-size: var(--font-size-lg);
}

.instruction code {
    background: var(--white);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', monospace;
    color: var(--primary-blue);
}

.requirements {
    background: var(--white);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(0, 102, 255, 0.1);
}

.requirements h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-6);
    text-align: center;
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-4);
}

.requirement {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4);
    background: var(--light-gray);
    border-radius: var(--radius-lg);
}

.requirement i {
    font-size: var(--font-size-lg);
    color: var(--primary-blue);
}

/* Simnova Section */
.simnova-content {
    max-width: 1000px;
    margin: 0 auto;
}

.simnova-intro {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-8);
    align-items: center;
    margin-bottom: var(--spacing-16);
}

.intro-text h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.intro-text p {
    color: var(--gray);
    line-height: 1.8;
    font-size: var(--font-size-lg);
}

.intro-visual {
    text-align: center;
}

.simulation-icon {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    box-shadow: var(--shadow-xl);
}

.simulation-icon i {
    font-size: var(--font-size-4xl);
    color: var(--white);
}

.simnova-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-16);
}

.feature-card {
    background: var(--white);
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid rgba(0, 102, 255, 0.1);
}

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

.feature-card .feature-icon {
    width: 70px;
    height: 70px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-4);
}

.feature-card .feature-icon i {
    font-size: var(--font-size-xl);
    color: var(--white);
}

.feature-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
}

.feature-card p {
    color: var(--gray);
    line-height: 1.7;
}

.simulation-benefits {
    background: var(--light-gray);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
}

.simulation-benefits h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-6);
}

.benefit {
    background: var(--white);
    padding: var(--spacing-6);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0, 102, 255, 0.1);
}

.benefit i {
    font-size: var(--font-size-2xl);
    color: var(--primary-blue);
    margin-bottom: var(--spacing-3);
}

.benefit h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.benefit p {
    color: var(--gray);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: var(--spacing-16) 0;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-6);
}

.footer-brand i {
    font-size: var(--font-size-3xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-text p {
    color: var(--gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-2);
}

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

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

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

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

/* Additional animations and effects */
.animate-in {
    animation: fadeInUp 0.8s ease-out forwards;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(30px);
}

.navbar {
    transition: all var(--transition-normal);
}

/* Copy button for code blocks */
.copy-btn {
    position: absolute;
    top: var(--spacing-2);
    right: var(--spacing-2);
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--white);
    padding: var(--spacing-2);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

/* Floating GitHub button */
.floating-github-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--white);
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
}

.floating-github-btn.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.floating-github-btn:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: var(--shadow-xl), var(--shadow-neon);
}

/* Theme toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--dark-gray);
    font-size: var(--font-size-lg);
    cursor: pointer;
    padding: var(--spacing-2);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--primary-blue);
    background: rgba(0, 102, 255, 0.1);
}

/* Dark theme */
.dark-theme {
    --white: #1e293b;
    --light-gray: #334155;
    --dark: #f8fafc;
    --dark-gray: #e2e8f0;
    --gray: #cbd5e1;
}

.dark-theme .navbar {
    background: rgba(30, 41, 59, 0.95);
    border-bottom: 1px solid rgba(0, 102, 255, 0.2);
}

.dark-theme .overview-card,
.dark-theme .tech-card,
.dark-theme .feature-card,
.dark-theme .github-card,
.dark-theme .setup-step,
.dark-theme .requirements {
    background: var(--dark-gray);
    border: 1px solid rgba(0, 102, 255, 0.2);
}

/* Particle animation */
@keyframes float-particle {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

.particle {
    pointer-events: none;
}

/* Loading animation */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 1;
    visibility: visible;
    transition: all 0.5s ease-out;
}

.loading.hide {
    opacity: 0;
    visibility: hidden;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(0, 102, 255, 0.3);
    border-top: 3px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Hover effects for cards */
.overview-card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-neon);
}

.tech-card:hover .tech-icon {
    transform: scale(1.1) rotate(-5deg);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
    box-shadow: 0 0 30px rgba(0, 102, 255, 0.3);
}

/* Glowing border effect */
.glow-border {
    position: relative;
    overflow: hidden;
}

.glow-border::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--gradient-primary);
    border-radius: inherit;
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.glow-border:hover::before {
    opacity: 1;
}

/* Text highlight effect */
.highlight-text {
    background: linear-gradient(120deg, transparent 0%, var(--cyan) 0%);
    background-size: 0% 100%;
    background-repeat: no-repeat;
    transition: background-size 0.3s ease;
}

.highlight-text:hover {
    background-size: 100% 100%;
}

/* Pulse animation for important elements */
.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Scroll indicator */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(0, 102, 255, 0.1);
    z-index: 1001;
}

.scroll-progress {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    transition: width 0.1s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: var(--spacing-4) var(--spacing-4);
        min-height: 70px;
    }
      .nav-brand {
        font-size: var(--font-size-xl);
    }
    
    .nav-logo {
        width: 2rem;
        height: 2rem;
    }
    
    .nav-brand i {
        font-size: var(--font-size-2xl);
    }
      .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        gap: var(--spacing-6);
        padding-top: var(--spacing-8);
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .hamburger {
        display: flex;
    }
      .hero {
        padding-top: 120px;
        min-height: calc(100vh - 70px);
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-8);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-subtitle {
        font-size: var(--font-size-lg);
    }
      .overview-grid,
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .ai-features-grid {
        gap: var(--spacing-8);
    }
    
    .workflow-steps {
        flex-direction: column;
    }
      .workflow-arrow {
        transform: rotate(90deg);
    }
    
    .video-demo {
        padding: var(--spacing-4);
        margin: var(--spacing-4) 0;
    }
    
    .video-container video:hover {
        transform: scale(1.01);
    }
    
    .diagram {
        flex-direction: column;
    }
    
    .diagram-arrow {
        transform: rotate(90deg);
    }
    
    .simnova-intro {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    .hero {
        padding: var(--spacing-16) 0;
        padding-top: 100px;
        min-height: calc(100vh - 70px);
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
        margin-top: var(--spacing-4);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    .section {
        padding: var(--spacing-12) 0;
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .btn {
        padding: var(--spacing-3) var(--spacing-5);
        font-size: var(--font-size-sm);
    }
    
    .floating-card,
    .overview-card,
    .tech-card,
    .feature-card {
        padding: var(--spacing-5);
    }
    
    .card-icon,
    .tech-icon {
        width: 60px;
        height: 60px;
    }
    
    .card-icon i,
    .tech-icon i {
        font-size: var(--font-size-xl);
    }
}

/* Print styles */
@media print {
    .navbar,
    .floating-github-btn,
    .hero-bg,
    .gradient-orb {
        display: none !important;
    }
    
    .hero {
        min-height: auto;
        padding: var(--spacing-8) 0;
    }
    
    .section {
        padding: var(--spacing-8) 0;
        break-inside: avoid;
    }
    
    .overview-card,
    .tech-card,
    .feature-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --primary-blue: #0000cc;
        --light-blue: #0066ff;
        --cyan: #0099cc;
        --gray: #333333;
        --dark-gray: #000000;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .floating-card {
        animation: none;
    }
    
    .gradient-orb {
        animation: none;
    }
}

/* Focus styles for accessibility */
.nav-link:focus,
.btn:focus,
.copy-btn:focus,
.theme-toggle:focus,
.floating-github-btn:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Skip to content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-blue);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 10001;
}

.skip-link:focus {
    top: 6px;
}

/* Simnova specific styles */
.simnova-mission {
    background: var(--light-gray);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    margin: var(--spacing-12) 0;
    text-align: center;
    border: 1px solid rgba(0, 102, 255, 0.1);
}

.simnova-mission h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-6);
    color: var(--primary-blue);
}

.simnova-mission p {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--dark-gray);
    max-width: 1000px;
    margin: 0 auto;
}

.tutor-acknowledgment {
    margin: var(--spacing-8) 0;
}

.acknowledgment-note {
    background: var(--light-gray);
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    text-align: center;
    border-left: 4px solid var(--primary-blue);
}

.acknowledgment-note p {
    font-size: var(--font-size-sm);
    color: var(--gray);
    margin: 0;
    font-style: italic;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

/* Background Operations Section */
.background-operations {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-top: var(--spacing-12);
}

.background-operations h3 {
    color: var(--white);
    font-size: var(--font-size-2xl);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.background-info {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
}

.background-feature {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-4);
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-6);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-normal);
}

.background-feature:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.background-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.background-icon i {
    font-size: var(--font-size-xl);
    color: var(--white);
}

.background-content h4 {
    color: var(--white);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.background-content p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
    margin: 0;
}

/* Difficulty Levels Table Styles */
.difficulty-levels {
    margin: var(--spacing-8) 0;
    padding: var(--spacing-6);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.difficulty-levels h4 {
    color: var(--white);
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    text-align: center;
}

.difficulty-levels > p {
    color: rgba(255, 255, 255, 0.9);
    text-align: center;
    margin-bottom: var(--spacing-6);
    font-size: var(--font-size-base);
}

.difficulty-table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.difficulty-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    font-size: var(--font-size-sm);
}

.difficulty-table th {
    background: var(--gradient-primary);
    color: var(--white);
    padding: var(--spacing-4);
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--primary-blue);
}

.difficulty-table th:first-child {
    border-top-left-radius: var(--radius-lg);
}

.difficulty-table th:last-child {
    border-top-right-radius: var(--radius-lg);
}

.difficulty-table td {
    padding: var(--spacing-4);
    border-bottom: 1px solid #e2e8f0;
    vertical-align: top;
}

.difficulty-table tbody tr:hover {
    background-color: #f8fafc;
    transition: var(--transition-fast);
}

.difficulty-table tbody tr:last-child td:first-child {
    border-bottom-left-radius: var(--radius-lg);
}

.difficulty-table tbody tr:last-child td:last-child {
    border-bottom-right-radius: var(--radius-lg);
}

.difficulty-table tbody tr:last-child td {
    border-bottom: none;
}

/* Difficulty Badges */
.difficulty-badge {
    display: inline-block;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.difficulty-badge.easy {
    background: linear-gradient(135deg, #10b981, #34d399);
    color: var(--white);
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.difficulty-badge.medium {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
    color: var(--white);
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.difficulty-badge.hard {
    background: linear-gradient(135deg, #ef4444, #f87171);
    color: var(--white);
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

/* Table List Styles */
.difficulty-table ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.difficulty-table li {
    position: relative;
    padding-left: var(--spacing-5);
    margin-bottom: var(--spacing-2);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.difficulty-table li:before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

.difficulty-table li:last-child {
    margin-bottom: 0;
}

/* Row-specific styling */
.difficulty-easy td {
    border-left: 4px solid #10b981;
}

.difficulty-medium td {
    border-left: 4px solid #f59e0b;
}

.difficulty-hard td {
    border-left: 4px solid #ef4444;
}

/* Responsive Design */
@media (max-width: 768px) {
    .difficulty-levels {
        padding: var(--spacing-4);
        margin: var(--spacing-6) 0;
    }
    
    .difficulty-table {
        font-size: var(--font-size-xs);
    }
    
    .difficulty-table th,
    .difficulty-table td {
        padding: var(--spacing-3);
    }
    
    .difficulty-table-container {
        margin: 0 -var(--spacing-4);
        border-radius: 0;
    }
    
    .difficulty-table th:first-child,
    .difficulty-table th:last-child,
    .difficulty-table tbody tr:last-child td:first-child,
    .difficulty-table tbody tr:last-child td:last-child {
        border-radius: 0;
    }
}

@media (max-width: 480px) {
    .difficulty-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
        font-size: var(--font-size-xs);
    }
    
    .difficulty-table thead,
    .difficulty-table tbody,
    .difficulty-table th,
    .difficulty-table td,
    .difficulty-table tr {
        display: block;
    }
    
    .difficulty-table thead tr {
        position: absolute;
        top: -9999px;
        left: -9999px;
    }
    
    .difficulty-table tr {
        border: 1px solid #ccc;
        margin-bottom: var(--spacing-4);
        border-radius: var(--radius-md);
        background: var(--white);
        box-shadow: var(--shadow-sm);
        padding: var(--spacing-3);
    }
    
    .difficulty-table tr:hover {
        background: #f8fafc;
    }
    
    .difficulty-table td {
        border: none;
        border-bottom: 1px solid #eee;
        position: relative;
        padding: var(--spacing-3) 0 var(--spacing-3) 35%;
        white-space: normal;
        text-align: left;
    }
    
    .difficulty-table td:before {
        content: attr(data-label) ": ";
        position: absolute;
        left: 6px;
        width: 30%;
        padding-right: var(--spacing-2);
        white-space: nowrap;
        text-align: left;
        font-weight: 600;
        color: var(--primary-blue);
    }
    
    .difficulty-table td:last-child {
        border-bottom: 0;
    }
    
    .difficulty-levels {
        padding: var(--spacing-3);
        margin: var(--spacing-4) 0;
    }    
    .difficulty-levels h4 {
        font-size: var(--font-size-lg);
    }
}

/* Diagnostic Types Styles */
.diagnostic-types {
    margin: var(--spacing-6) 0;
}

.diagnostic-types h4 {
    color: var(--white);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    text-align: center;
}

.diagnostic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-4);
    margin-top: var(--spacing-4);
}

.diagnostic-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-4);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    transition: var(--transition-normal);
    cursor: pointer;
}

.diagnostic-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.diagnostic-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-secondary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-2);
    box-shadow: var(--shadow-md);
}

.diagnostic-icon i {
    font-size: var(--font-size-lg);
    color: var(--white);
}

.diagnostic-item span {
    color: var(--white);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-align: center;
    line-height: 1.3;
}

/* Responsive adjustments for diagnostic grid */
@media (max-width: 768px) {
    .diagnostic-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: var(--spacing-3);
    }
    
    .diagnostic-item {
        padding: var(--spacing-3);
    }
    
    .diagnostic-icon {
        width: 40px;
        height: 40px;
    }
    
    .diagnostic-icon i {
        font-size: var(--font-size-base);
    }
    
    .diagnostic-item span {
        font-size: var(--font-size-xs);
    }
}

@media (max-width: 480px) {
    .diagnostic-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Materials Types Styles */
.materials-types {
    margin: var(--spacing-6) 0;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    padding: var(--spacing-5);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.materials-types h4 {
    color: var(--white);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    text-align: center;
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-4);
    margin-top: var(--spacing-4);
}

.material-type {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-4);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    transition: var(--transition-normal);
    cursor: pointer;
}

.material-type:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.material-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-2);
    box-shadow: var(--shadow-md);
}

.material-icon i {
    font-size: var(--font-size-lg);
    color: var(--white);
}

.material-type span {
    color: var(--white);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-align: center;
    line-height: 1.3;
}

/* Responsive adjustments for materials grid */
@media (max-width: 768px) {
    .materials-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: var(--spacing-3);
    }
    
    .material-type {
        padding: var(--spacing-3);
    }
    
    .material-icon {
        width: 40px;
        height: 40px;
    }
    
    .material-icon i {
        font-size: var(--font-size-base);
    }
    
    .material-type span {
        font-size: var(--font-size-xs);
    }
}

@media (max-width: 480px) {
    .materials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Options Container Styles for Installation Section */
.options-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
    margin-top: var(--spacing-6);
}

.option-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(0, 82, 204, 0.1);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

.option-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-blue);
}

.option-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-3);
    border-bottom: 1px solid rgba(0, 82, 204, 0.1);
}

.option-header i {
    font-size: var(--font-size-2xl);
    color: var(--primary-blue);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 82, 204, 0.1);
    border-radius: var(--radius-lg);
}

.option-header h4 {
    color: var(--dark-blue);
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin: 0;
}

.option-card p {
    color: var(--gray);
    margin-bottom: var(--spacing-4);
    line-height: 1.6;
}

.option-card .btn {
    margin-top: var(--spacing-4);
    width: 100%;
    justify-content: center;
}

/* Responsive adjustments for options */
@media (max-width: 768px) {
    .options-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    .option-card {
        padding: var(--spacing-4);
    }
    
    .option-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-2);
    }
    
    .option-header i {
        font-size: var(--font-size-xl);
        width: 35px;
        height: 35px;
    }
    
    .option-header h4 {
        font-size: var(--font-size-lg);
    }
}

/* Important Note Styles */
.important-note {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    border: 2px solid #f39c12;
    border-radius: 12px;
    padding: var(--spacing-5);
    margin-top: var(--spacing-6);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-4);
    box-shadow: 0 4px 12px rgba(243, 156, 18, 0.1);
}

.note-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: #f39c12;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-xl);
}

.note-content h4 {
    color: #8b5a00;
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0 0 var(--spacing-2) 0;
}

.note-content p {
    color: #8b5a00;
    margin: 0;
    line-height: 1.6;
}

.note-content code {
    background: rgba(139, 90, 0, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

/* Troubleshooting Section Styles */
.troubleshooting-content {
    max-width: 1200px;
    margin: 0 auto;
}

.trouble-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-8);
}

.trouble-card {
    background: white;
    border-radius: 16px;
    padding: var(--spacing-6);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 82, 204, 0.1);
}

.trouble-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.trouble-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-2xl);
    color: white;
}

.trouble-icon.backend {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.trouble-icon.interface {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.trouble-icon.scenario {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.trouble-icon.generation {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.trouble-card h3 {
    color: var(--dark-blue);
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    line-height: 1.3;
}

.trouble-solutions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.solution {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    padding: var(--spacing-3);
    background: rgba(0, 82, 204, 0.05);
    border-radius: 8px;
    border-left: 3px solid var(--primary-blue);
}

.solution i {
    color: var(--primary-blue);
    font-size: var(--font-size-sm);
    margin-top: 2px;
    flex-shrink: 0;
}

.solution span {
    color: var(--dark-gray);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.solution a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
}

.solution a:hover {
    text-decoration: underline;
}

.additional-help {
    margin-top: var(--spacing-8);
}

.help-card {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--cyan) 100%);
    border-radius: 20px;
    padding: var(--spacing-8);
    text-align: center;
    color: white;
}

.help-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-4);
    font-size: var(--font-size-3xl);
}

.help-card h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.help-card p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-6);
    opacity: 0.9;
    line-height: 1.6;
}

.help-links {
    display: flex;
    gap: var(--spacing-4);
    justify-content: center;
    flex-wrap: wrap;
}

.help-links .btn {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    backdrop-filter: blur(10px);
}

.help-links .btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

/* Navigation Dropdown Styles */
.nav-dropdown {
    position: relative;
    display: flex;
    align-items: center;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    height: 100%;
    padding: var(--spacing-2) var(--spacing-4);
}

.dropdown-toggle i {
    font-size: 0.8em;
    transition: transform 0.3s ease;
}

.nav-dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(0, 82, 204, 0.1);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    padding: var(--spacing-2) 0;
    margin-top: var(--spacing-1);
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    list-style: none;
}

.dropdown-link {
    display: block;
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--dark-gray);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.dropdown-link:hover {
    background: rgba(0, 82, 204, 0.05);
    color: var(--primary-blue);
    border-left-color: var(--primary-blue);
}

/* Ensure all nav items have consistent alignment */
.nav-menu {
    display: flex;
    align-items: center;
    height: 100%;
}

.nav-menu li {
    display: flex;
    align-items: center;
    height: 100%;
}

.nav-link {
    display: flex;
    align-items: center;
    height: 100%;
    padding: var(--spacing-2) var(--spacing-4);
}

/* Mobile Navigation Updates */
@media (max-width: 768px) {
    .nav-dropdown {
        position: static;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        background: transparent;
        padding: 0;
        margin-left: var(--spacing-4);
        margin-top: 0;
    }
    
    .dropdown-link {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: var(--font-size-sm);
        border-left: 2px solid rgba(255, 255, 255, 0.2);
    }
    
    .dropdown-link:hover {
        background: rgba(255, 255, 255, 0.1);
        color: white;
        border-left-color: white;
    }
    
    .dropdown-toggle i {
        display: none;
    }
    
    .nav-menu, .nav-menu li, .nav-link, .dropdown-toggle {
        height: auto;
    }
}