/* Modern IoT Traffic Light System - Professional Design */

/* --- CSS Variables & Design System --- */
:root {
    /* Color Palette */
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-500: #0ea5e9;
    --primary-600: #0284c7;
    --primary-700: #0369a1;
    --primary-800: #075985;
    --primary-900: #0c4a6e;
    
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;
    --success-800: #166534;
    
    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --warning-700: #b45309;
    
    --error-50: #fef2f2;
    --error-100: #fee2e2;
    --error-500: #ef4444;
    --error-600: #dc2626;
    --error-700: #b91c1c;
    
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #e5e5e5;
    --neutral-300: #d4d4d4;
    --neutral-400: #a3a3a3;
    --neutral-500: #737373;
    --neutral-600: #525252;
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;
    
    /* 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;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

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

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--neutral-800);
    background: linear-gradient(135deg, var(--neutral-50) 0%, var(--primary-50) 100%);
    min-height: 100vh;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--neutral-900);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-4);
    color: var(--neutral-700);
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--neutral-200);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.brand-icon {
    font-size: 2rem;
    color: var(--primary-600);
}

.brand-text h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.2;
}

.brand-text p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.2;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    height: 100%;
    flex-wrap: wrap;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-3);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    position: relative;
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
}

.nav-link:hover {
    background: var(--primary-50);
    color: var(--primary-700);
    transform: translateX(2px);
}

.nav-link.active {
    background: var(--primary-100);
    color: var(--primary-700);
    font-weight: 600;
}

.nav-icon {
    font-size: 1rem;
    width: 1.25rem;
    text-align: center;
}

.nav-text {
    font-size: 0.875rem;
}

.section-indicator {
    position: absolute;
    right: var(--spacing-2);
    width: 6px;
    height: 6px;
    background: var(--primary-500);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-link.active .section-indicator {
    opacity: 1;
}

/* Responsive Navigation */
@media (max-width: 1200px) {
    .nav-menu {
        gap: var(--spacing-3);
    }
    
    .nav-link {
        padding: var(--spacing-1) var(--spacing-2);
        font-size: 0.8rem;
    }
    
    .nav-text {
        font-size: 0.8rem;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--spacing-4);
        height: 60px;
    }
    
    .brand-text h1 {
        font-size: 1rem;
    }
    
    .brand-text p {
        font-size: 0.75rem;
    }
    
    .nav-menu {
        gap: var(--spacing-2);
    }
    
    .nav-link {
        padding: var(--spacing-1);
        font-size: 0.75rem;
    }
    
    .nav-text {
        font-size: 0.75rem;
    }
    
    .nav-icon {
        font-size: 0.875rem;
        width: 1rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 var(--spacing-3);
    }
    
    .brand-text h1 {
        font-size: 0.875rem;
    }
    
    .brand-text p {
        font-size: 0.7rem;
    }
    
    .nav-menu {
        gap: var(--spacing-1);
    }
    
    .nav-link {
        padding: var(--spacing-1);
        font-size: 0.7rem;
    }
    
    .nav-text {
        font-size: 0.7rem;
    }
    
    .nav-icon {
        font-size: 0.8rem;
        width: 0.875rem;
    }
}

/* --- Main Content --- */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    padding-top: var(--spacing-8);
    min-height: 100vh;
    position: relative;
}

/* When hero is active, adjust main content padding */
.main-content:has(.hero-section.active) {
    padding-top: 0;
}

/* --- Hero Section --- */
.hero-section {
    display: grid !important;
    grid-template-columns: 70% 30% !important;
    gap: var(--spacing-8);
    align-items: center;
    padding: var(--spacing-20) 0;
    min-height: 80vh;
    max-width: 1200px;
    margin: 0 auto;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    /* Debug: Force layout */
    flex-direction: unset !important;
    flex-wrap: unset !important;
}

/* When hero is not active, completely hide it */
.hero-section:not(.active) {
    display: none !important;
    min-height: auto;
    padding: 0;
    margin: 0;
    opacity: 0;
    transform: scale(0);
    position: absolute;
    z-index: -1;
}

/* Ensure other sections are properly positioned when hero is not active */
.section:not(.hero-section) {
    padding: var(--spacing-16) 0;
    position: relative;
    z-index: 2;
}

/* When hero is active, other sections can have more spacing */
.hero-section.active ~ .section {
    padding: var(--spacing-20) 0;
}

/* When hero is hidden, first section should have proper top spacing */
.section:not(.hero-section):first-of-type {
    padding-top: var(--spacing-20);
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
    padding-right: var(--spacing-8);
    width: 100%;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    background: linear-gradient(135deg, var(--primary-500), var(--success-500));
    color: white;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-sm);
    font-weight: 600;
    width: fit-content;
}

.hero-badge::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 ease;
}

.hero-badge:hover::before {
    left: 100%;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--neutral-900), var(--primary-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
    margin-bottom: var(--spacing-4);
}

.hero-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--success-500));
    border-radius: 2px;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--neutral-600);
    line-height: 1.6;
    margin-bottom: var(--spacing-6);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-1);
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-600);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--neutral-500);
    font-weight: 500;
}

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

.hero-actions .btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-actions .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 400px;
    /* Ensure it takes full width of its grid column */
    min-width: 0;
}

.traffic-light-demo {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
    align-items: center;
    background: var(--neutral-800);
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 150px;
}

.light {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--neutral-400);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.light.red.active { 
    background: var(--error-500); 
    box-shadow: 0 0 20px var(--error-500);
    transform: scale(1.1);
}

.light.yellow { 
    background: var(--warning-500); 
}

.light.yellow.active {
    background: var(--warning-500);
    box-shadow: 0 0 20px var(--warning-500);
    transform: scale(1.1);
}

.light.green { 
    background: var(--success-500); 
}

.light.green.active {
    background: var(--success-500);
    box-shadow: 0 0 20px var(--success-500);
    transform: scale(1.1);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-fast);
    border: none;
    cursor: pointer;
    font-size: var(--font-size-base);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: white;
    color: var(--neutral-700);
    border: 2px solid var(--neutral-200);
}

.btn-secondary:hover {
    background: var(--neutral-50);
    border-color: var(--neutral-300);
    transform: translateY(-1px);
}

/* --- 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);
    background: linear-gradient(135deg, var(--neutral-900), var(--primary-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* --- Cards --- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-10);
    margin-bottom: var(--spacing-8);
    margin-top: var(--spacing-8);
}

.card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition-normal);
    border: 1px solid var(--neutral-200);
    margin-bottom: var(--spacing-6);
}

/* Standalone cards that need extra spacing */
.card:not(.card-grid .card) {
    margin-bottom: var(--spacing-8);
}

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

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-6);
    border-bottom: 1px solid var(--neutral-100);
    background: var(--neutral-50);
}

.card-icon {
    font-size: var(--font-size-2xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-500), var(--success-500));
    color: white;
    border-radius: var(--radius-lg);
}

.card-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--neutral-900);
    margin: 0;
}

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

/* --- Feature Lists --- */
.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) 0;
    border-bottom: 1px solid var(--neutral-100);
}

.feature-list li:last-child {
    border-bottom: none;
}

/* --- Status Colors --- */
.status-active { color: var(--success-700); font-weight: 600; }
.status-masked { color: var(--warning-700); font-weight: 600; }
.status-failed { color: var(--error-700); font-weight: 600; }
.status-inactive { color: var(--neutral-500); }

/* --- Info Grids --- */
.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-10);
    margin-top: var(--spacing-6);
}

.info-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-3);
}

/* --- Architecture Showcase --- */
.architecture-showcase {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.architecture-showcase h3 {
    text-align: center;
    margin-bottom: var(--spacing-8);
    font-size: var(--font-size-2xl);
    color: var(--neutral-900);
}

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

.layer-card {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    text-align: center;
    border: 2px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.layer-card:hover {
    border-color: var(--primary-300);
    transform: translateY(-2px);
}

.layer-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-500), var(--success-500));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-xl);
    margin: 0 auto var(--spacing-4);
}

.layer-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-2);
}

.layer-card p {
    color: var(--neutral-600);
    margin: 0;
}

/* --- Hardware Showcase --- */
.hardware-showcase {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.hardware-showcase h3 {
    text-align: center;
    margin-bottom: var(--spacing-8);
    font-size: var(--font-size-2xl);
    color: var(--neutral-900);
}

.component-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-6);
}

.component-card {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    text-align: center;
    border: 2px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.component-card:hover {
    border-color: var(--primary-300);
    transform: translateY(-2px);
}

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

.component-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-2);
}

.component-card p {
    color: var(--neutral-600);
    margin: 0;
}

/* --- Pattern Selector --- */
.pattern-selector {
    display: flex;
    gap: var(--spacing-3);
    margin: var(--spacing-8) 0;
    flex-wrap: wrap;
    justify-content: center;
}

.pattern-btn {
    padding: var(--spacing-3) var(--spacing-6);
    border: 2px solid var(--neutral-200);
    background: white;
    color: var(--neutral-600);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.pattern-btn:hover {
    border-color: var(--primary-300);
    color: var(--primary-600);
}

.pattern-btn.active {
    background: var(--primary-600);
    color: white;
    border-color: var(--primary-600);
}

/* --- Logic Display --- */
.logic-display {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-8);
    margin: var(--spacing-8) 0;
}

.table-container, .chart-container {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
}

.table-container h4, .chart-container h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-4);
    text-align: center;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
}

.chart-wrapper {
    height: 600px;
    position: relative;
}

/* --- System Info --- */
.system-info {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    margin: var(--spacing-8) 0;
    border: 1px solid var(--neutral-200);
}

.system-info h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-4);
    text-align: center;
}

.info-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-4);
}

.metric {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-4);
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
}

.metric-label {
    font-size: var(--font-size-sm);
    color: var(--neutral-500);
    text-align: center;
}

.metric-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-600);
}

/* --- Emergency Notice --- */
.emergency-notice {
    display: flex;
    gap: var(--spacing-4);
    background: var(--warning-50);
    border: 1px solid var(--warning-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    margin: var(--spacing-8) 0;
}

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

.notice-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--warning-800);
    margin-bottom: var(--spacing-2);
}

.notice-content p {
    color: var(--warning-700);
    margin: 0;
}

/* --- Pinout & Connection Card --- */
.pinout-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-6);
}

.pinout-section {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border: 1px solid var(--neutral-200);
}

.pinout-section h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-3);
    text-align: center;
}

.pin-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.pin-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-2) var(--spacing-3);
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.pin-item:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
    transform: translateX(2px);
}

.pin-number {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--primary-600);
    background: var(--primary-100);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.pin-label {
    font-weight: 500;
    color: var(--neutral-700);
}

.connection-guide {
    background: var(--success-50);
    border: 1px solid var(--success-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    margin-top: var(--spacing-6);
}

.connection-guide h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--success-800);
    margin-bottom: var(--spacing-4);
    text-align: center;
}

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

.connection-step {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    padding: var(--spacing-3);
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--success-200);
}

.connection-step .step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--success-500);
    color: white;
    border-radius: 50%;
    font-size: var(--font-size-sm);
    font-weight: 600;
    flex-shrink: 0;
}

.connection-step p {
    margin: 0;
    color: var(--success-700);
    font-weight: 500;
}

/* --- Simulation Grid --- */
.simulation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-10);
    margin-bottom: var(--spacing-8);
    margin-top: var(--spacing-8);
}

.simulation-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--neutral-200);
}

.simulation-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-6);
    background: var(--neutral-50);
    border-bottom: 1px solid var(--neutral-200);
}

.simulation-icon {
    font-size: var(--font-size-2xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-500), var(--success-500));
    color: white;
    border-radius: var(--radius-lg);
}

.simulation-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--neutral-900);
    margin: 0;
}

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

.simulation-link {
    display: block;
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--primary-600);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    transition: var(--transition-fast);
}

.simulation-link:hover {
    background: var(--primary-700);
    transform: translateY(-1px);
}

.simulation-content p {
    color: var(--neutral-600);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* --- Usage Guide --- */
.usage-guide {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.usage-guide h3 {
    text-align: center;
    margin-bottom: var(--spacing-8);
    font-size: var(--font-size-2xl);
    color: var(--neutral-900);
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-6);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-3);
}

.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-500), var(--success-500));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-xl);
}

.step p {
    color: var(--neutral-700);
    margin: 0;
    font-weight: 500;
}

/* --- Code Examples --- */
.code-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-8);
}

.code-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--neutral-200);
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-6);
    background: var(--neutral-900);
    color: white;
}

.code-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
    color: white;
}

.code-type {
    background: var(--primary-500);
    color: white;
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

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

.code-content pre {
    background: var(--neutral-900);
    color: var(--neutral-100);
    padding: var(--spacing-4);
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

/* --- Troubleshoot Lists --- */
.troubleshoot-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.troubleshoot-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3);
    background: var(--neutral-50);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--error-500);
}

/* --- Resources --- */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-10);
    margin-top: var(--spacing-8);
}

.resource-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--neutral-200);
}

.resource-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-4);
}

.resource-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.resource-list a {
    color: var(--primary-600);
    text-decoration: none;
    padding: var(--spacing-2) 0;
    border-bottom: 1px solid var(--neutral-100);
    transition: var(--transition-fast);
}

.resource-list a:hover {
    color: var(--primary-700);
    border-bottom-color: var(--primary-300);
}

/* --- Footer --- */
.footer {
    background: var(--neutral-900);
    color: var(--neutral-400);
    text-align: center;
    padding: var(--spacing-8) 0;
    margin-top: var(--spacing-20);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

/* --- Utility Classes --- */
.text-center { text-align: center; }
.text-content { line-height: 1.7; color: var(--neutral-700); }

/* --- Animations --- */

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

.card, .simulation-card, .code-card {
    animation: fadeInUp 0.6s ease-out;
}

/* --- Toast Styles (Updated) --- */
.custom-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    z-index: 1000;
    opacity: 0;
    transform: translateX(100%);
    transition: var(--transition-normal);
}

.custom-toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast-success { background: var(--success-100); color: var(--success-800); border: 1px solid var(--success-200); }
.toast-error { background: var(--error-100); color: var(--error-800); border: 1px solid var(--error-200); }
.toast-warning { background: var(--warning-100); color: var(--warning-800); border: 1px solid var(--warning-200); }
.toast-info { background: var(--primary-100); color: var(--primary-800); border: 1px solid var(--primary-200); }

/* --- Table Styles (Updated) --- */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

th {
    background: var(--neutral-50);
    padding: var(--spacing-3) var(--spacing-4);
    text-align: left;
    font-weight: 600;
    color: var(--neutral-700);
    border-bottom: 2px solid var(--neutral-200);
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

td {
    padding: var(--spacing-3) var(--spacing-4);
    border-bottom: 1px solid var(--neutral-100);
    color: var(--neutral-700);
}

tr:hover {
    background: var(--neutral-50);
}

/* --- Missing Classes --- */
.architecture-showcase {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-8);
}

.architecture-showcase h3 {
    text-align: center;
    margin-bottom: var(--spacing-8);
    font-size: var(--font-size-2xl);
    color: var(--neutral-900);
}

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

.layer-card {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    text-align: center;
    border: 2px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.layer-card:hover {
    border-color: var(--primary-300);
    transform: translateY(-2px);
}

.layer-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-500), var(--success-500));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-xl);
    margin: 0 auto var(--spacing-4);
}

.layer-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-2);
}

.layer-card p {
    color: var(--neutral-600);
    margin: 0;
}

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

.spec-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-3);
    background: var(--neutral-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
}

.spec-label {
    font-weight: 600;
    color: var(--neutral-700);
}

.spec-value {
    color: var(--primary-600);
    font-weight: 600;
}

.hardware-showcase {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-8);
}

.hardware-showcase h3 {
    text-align: center;
    margin-bottom: var(--spacing-8);
    font-size: var(--font-size-2xl);
    color: var(--neutral-900);
}

.component-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-6);
}

.component-card {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    text-align: center;
    border: 2px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.component-card:hover {
    border-color: var(--primary-300);
    transform: translateY(-2px);
}

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

.component-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-2);
}

.component-card p {
    color: var(--neutral-600);
    margin: 0;
}

.troubleshoot-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.troubleshoot-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3);
    background: var(--neutral-50);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--error-500);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-8);
}

.resource-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--neutral-200);
}

.resource-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-4);
}

.resource-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.resource-list a {
    color: var(--primary-600);
    text-decoration: none;
    padding: var(--spacing-2) 0;
    border-bottom: 1px solid var(--neutral-100);
    transition: var(--transition-fast);
}

.resource-list a:hover {
    color: var(--primary-700);
    border-bottom-color: var(--primary-300);
}

.code-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-8);
}

.code-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--neutral-200);
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-6);
    background: var(--neutral-900);
    color: white;
}

.code-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
    color: white;
}

.code-type {
    background: var(--primary-500);
    color: white;
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

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

.code-content pre {
    background: var(--neutral-900);
    color: var(--neutral-100);
    padding: var(--spacing-6);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.6;
    border: 1px solid var(--neutral-700);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.code-content code {
    background: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-family: inherit;
    font-size: inherit;
}

.text-content {
    line-height: 1.7;
    color: var(--neutral-700);
}

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

.topic-item {
    padding: var(--spacing-3);
    background: var(--neutral-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: var(--font-size-sm);
    color: var(--neutral-700);
}

.usage-guide {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-8);
}

.usage-guide h3 {
    text-align: center;
    margin-bottom: var(--spacing-8);
    font-size: var(--font-size-2xl);
    color: var(--neutral-900);
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-6);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-3);
}

.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-500), var(--success-500));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-xl);
}

.step p {
    color: var(--neutral-700);
    margin: 0;
    font-weight: 500;
}

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

.spec-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-3);
    background: var(--neutral-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
}

.spec-label {
    font-weight: 600;
    color: var(--neutral-700);
}

.spec-value {
    color: var(--primary-600);
    font-weight: 600;
} 

/* --- Section Management & Animations --- */
.section, #hero, #overview {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

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

/* Smooth fade-in animation for sections */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section.active, #hero.active, #overview.active {
    animation: fadeInUp 0.5s ease-out;
}

/* Enhanced navigation transitions */
.nav-link {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-500), var(--success-500));
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-50%);
}

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

.nav-link.active {
    background: linear-gradient(135deg, var(--primary-50), var(--success-50));
    color: var(--primary-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Smooth content transitions */
.card, .simulation-card, .code-card {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover, .simulation-card:hover, .code-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Enhanced button transitions */
.pattern-btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.pattern-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 ease;
}

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

.pattern-btn.active {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* Smooth table and chart transitions */
.table-wrapper, .chart-wrapper {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.table-wrapper:hover, .chart-wrapper:hover {
    transform: scale(1.02);
}

/* Enhanced toast animations */
.custom-toast {
    transform: translateX(100%);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.custom-toast.show {
    transform: translateX(0);
}

/* Smooth hero section animations */
.hero-section.active {
    animation: fadeInUp 0.8s ease-out;
}

.hero-content {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-stats {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-item {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-item:hover {
    transform: scale(1.1);
}

/* Smooth traffic light demo animations */
.traffic-light-demo {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.light {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.light.active {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 20px currentColor;
    }
    50% {
        box-shadow: 0 0 30px currentColor, 0 0 40px currentColor;
    }
}



/* Enhanced section transition effects */
.section, #hero, #overview {
    position: relative;
}

.section::before, #hero::before, #overview::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-50), var(--success-50));
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: -1;
}

.section.active::before, #hero.active::before, #overview.active::before {
    opacity: 0.1;
}

/* Ensure navbar stays clickable */
.navbar {
    z-index: 1000;
    pointer-events: auto;
}

.nav-link {
    pointer-events: auto;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.nav-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--primary-50), var(--success-50));
    color: var(--primary-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Transition feedback without blocking */
.transition-feedback {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    pointer-events: none;
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.transition-feedback.show {
    opacity: 1;
}

/* Smooth content reveal animation */
.card, .simulation-card, .code-card {
    animation: fadeInUp 0.6s ease-out;
    animation-delay: calc(var(--animation-order, 0) * 0.1s);
}

/* Enhanced navigation feedback */
.nav-link {
    position: relative;
    overflow: hidden;
}

.nav-link::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

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

/* Improved button hover effects */
.btn {
    position: relative;
    overflow: hidden;
    pointer-events: auto;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transition: all 0.3s ease;
    transform: translate(-50%, -50%);
}

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

/* Progress indicator for current section */
.progress-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--neutral-200);
    z-index: 1000;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500), var(--success-500));
    width: 0%;
    transition: width 0.6s ease;
    position: relative;
}

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

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Section counter indicator */
.section-counter {
    position: fixed;
    bottom: var(--spacing-6);
    right: var(--spacing-6);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--neutral-200);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--neutral-700);
    z-index: 100;
    display: none;
}

.section-counter.show {
    display: block;
    animation: fadeInUp 0.3s ease-out;
}

/* Enhanced navigation with section indicators */
.nav-link {
    position: relative;
}

.nav-link .section-indicator {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 8px;
    height: 8px;
    background: var(--success-500);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-link.active .section-indicator {
    opacity: 1;
    animation: pulse 2s infinite;
}

/* Smooth page transitions */
.page-transition {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-500), var(--success-500));
    z-index: 9998;
    transform: translateY(100%);
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-transition.active {
    transform: translateY(0);
} 

/* --- Mobile Error Message --- */
.mobile-error {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-600), var(--success-600));
    color: white;
    z-index: 10000;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--spacing-8);
}

.mobile-error.show {
    display: flex;
}

.mobile-error h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-4);
    color: white;
}

.mobile-error p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-6);
    opacity: 0.9;
}

.mobile-error .icon {
    font-size: var(--font-size-6xl);
    margin-bottom: var(--spacing-4);
}

/* Mobile detection - show error on screens smaller than 768px */
@media (max-width: 768px) {
    .mobile-error {
        display: flex;
    }
    
    /* Hide all content on mobile */
    .navbar,
    .main-content,
    .hero-section,
    .section {
        display: none !important;
    }
}

/* --- Hardware & Electronics Section Styles --- */

/* Component Overview */
.component-overview {
    margin: var(--spacing-6) 0;
}

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

.component-card {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    border: 1px solid var(--neutral-200);
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.component-card:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.component-icon {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-3);
    display: block;
}

.component-card h4 {
    color: var(--primary-700);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-3);
    font-weight: 600;
}

/* Circuit Diagram Styles */
.circuit-diagram-section {
    margin: var(--spacing-6) 0;
}

.circuit-diagram-section h4 {
    color: var(--neutral-800);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-4);
    font-weight: 600;
}

.led-connection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-4);
}

.direction-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-5);
    border: 1px solid var(--neutral-200);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.direction-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--primary-200);
}

.direction-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-3);
    padding-bottom: var(--spacing-2);
    border-bottom: 2px solid var(--neutral-200);
}

.direction-icon {
    font-size: var(--font-size-lg);
}

.direction-header h5 {
    color: var(--primary-700);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
}

.led-connection-table {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.led-row {
    display: grid;
    grid-template-columns: 40px 90px 80px 1fr;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-3);
    background: var(--neutral-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.led-row:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
    transform: translateX(2px);
}

.led-color {
    font-size: var(--font-size-lg);
    text-align: center;
}

.gpio-pin {
    background: var(--primary-600);
    color: white;
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-align: center;
}

.led-label {
    color: var(--neutral-700);
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-align: center;
}

.connection-info {
    color: var(--neutral-500);
    font-size: var(--font-size-sm);
    text-align: right;
    font-style: italic;
}

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

.pinout-section {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border: 1px solid var(--neutral-200);
}

.pinout-section h5 {
    color: var(--primary-700);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-3);
    font-weight: 600;
}

.pin-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.pin-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2);
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.pin-item:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
    transform: translateY(-1px);
}

.pin-number {
    background: var(--primary-600);
    color: white;
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    min-width: 60px;
    text-align: center;
}

.pin-label {
    font-weight: 600;
    color: var(--neutral-700);
    flex: 1;
}

.pin-connection {
    color: var(--neutral-500);
    font-size: var(--font-size-sm);
    font-style: italic;
}

.button-connections {
    margin-top: var(--spacing-6);
    padding: var(--spacing-4);
    background: var(--warning-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--warning-200);
}

.button-connections h5 {
    color: var(--warning-700);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-3);
    font-weight: 600;
}

/* Component Specifications */
.component-specs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.spec-section {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border: 1px solid var(--neutral-200);
}

.spec-section h4 {
    color: var(--primary-700);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-4);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-3);
}

.spec-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-2) var(--spacing-3);
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.spec-item:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
}

.spec-label {
    font-weight: 600;
    color: var(--neutral-700);
}

.spec-value {
    color: var(--primary-600);
    font-weight: 500;
    text-align: right;
}

/* Power Analysis */
.power-analysis {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.power-section {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border: 1px solid var(--neutral-200);
}

.power-section h4 {
    color: var(--primary-700);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-4);
    font-weight: 600;
}

.power-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-3);
}

.power-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-3);
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.power-item:hover {
    background: var(--success-50);
    border-color: var(--success-200);
}

.power-label {
    font-weight: 600;
    color: var(--neutral-700);
    flex: 1;
}

.power-value {
    color: var(--success-600);
    font-weight: 500;
    text-align: center;
}

.power-power {
    color: var(--warning-600);
    font-weight: 600;
    text-align: right;
    min-width: 80px;
}

.power-recommendations {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-4);
}

.recommendation-item {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-4);
    border: 1px solid var(--neutral-200);
}

.recommendation-item h5 {
    color: var(--primary-700);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-3);
    font-weight: 600;
}

/* Safety Features */
.safety-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
}

.safety-section {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border: 1px solid var(--neutral-200);
}

.safety-section h4 {
    color: var(--primary-700);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-3);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

/* Environmental Factors */
.environmental-factors {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.env-section {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border: 1px solid var(--neutral-200);
}

.env-section h4 {
    color: var(--primary-700);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-3);
    font-weight: 600;
}

.env-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-3);
}

.env-item {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-3);
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
    transition: var(--transition-fast);
}

.env-item:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
}

.env-label {
    font-weight: 600;
    color: var(--neutral-700);
    font-size: var(--font-size-sm);
}

.env-value {
    color: var(--success-600);
    font-weight: 600;
    font-size: var(--font-size-lg);
    margin: var(--spacing-1) 0;
}

.env-note {
    color: var(--neutral-500);
    font-size: var(--font-size-sm);
    font-style: italic;
}

/* EMI/EMC Considerations */
.emi-considerations {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
}

.emi-section {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border: 1px solid var(--neutral-200);
}

.emi-section h4 {
    color: var(--primary-700);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-3);
    font-weight: 600;
}

/* PCB Considerations */
.pcb-considerations {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
}

.pcb-section {
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border: 1px solid var(--neutral-200);
}

.pcb-section h4 {
    color: var(--primary-700);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-3);
    font-weight: 600;
}

/* Responsive Design for Hardware Section */
@media (max-width: 768px) {
    .component-grid {
        grid-template-columns: 1fr;
    }
    
    .led-connection-grid {
        grid-template-columns: 1fr;
    }
    
    .pinout-grid {
        grid-template-columns: 1fr;
    }
    
    .power-grid {
        grid-template-columns: 1fr;
    }
    
    .spec-grid {
        grid-template-columns: 1fr;
    }
    
    .env-grid {
        grid-template-columns: 1fr;
    }
    
    .led-row {
        flex-direction: column;
        gap: var(--spacing-2);
        text-align: center;
    }
    
    .connection-info {
        text-align: center;
    }
    
    .power-item {
        flex-direction: column;
        gap: var(--spacing-2);
        text-align: center;
    }
    
    .spec-item {
        flex-direction: column;
        gap: var(--spacing-2);
        text-align: center;
    }
    
    .pin-item {
        flex-direction: column;
        gap: var(--spacing-2);
        text-align: center;
    }
} /* CSS Updated: Mon Jul 28 05:18:32 AM WIB 2025 */

/* --- Code Block Styling --- */
.code-example {
    margin: var(--spacing-6) 0;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--neutral-200);
}

.code-example h4 {
    background: var(--neutral-900);
    color: white;
    padding: var(--spacing-4) var(--spacing-6);
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
    border-bottom: 1px solid var(--neutral-700);
}

.code-example pre {
    background: var(--neutral-900);
    color: var(--neutral-100);
    padding: var(--spacing-8);
    margin: 0;
    border-radius: 0;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: var(--font-size-base);
    line-height: 2.2;
    border: none;
    white-space: pre-wrap;
    word-wrap: break-word;
    letter-spacing: 0.5px;
    font-weight: 400;
}

.code-example code {
    background: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-family: inherit;
    font-size: inherit;
}

/* Enhanced code content styling */
.code-content {
    padding: var(--spacing-6);
}

.code-content pre {
    background: var(--neutral-900);
    color: var(--neutral-100);
    padding: var(--spacing-8);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: var(--font-size-base);
    line-height: 2.2;
    border: 1px solid var(--neutral-700);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    white-space: pre-wrap;
    word-wrap: break-word;
    letter-spacing: 0.5px;
    font-weight: 400;
}

.code-content code {
    background: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-family: inherit;
    font-size: inherit;
}

/* Standalone pre/code blocks */
pre {
    background: var(--neutral-900);
    color: var(--neutral-100);
    padding: var(--spacing-8);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: var(--font-size-base);
    line-height: 2.2;
    border: 1px solid var(--neutral-700);
    box-shadow: var(--shadow-md);
    margin: var(--spacing-4) 0;
    white-space: pre-wrap;
    word-wrap: break-word;
    letter-spacing: 0.5px;
    font-weight: 400;
}

code {
    background: var(--neutral-100);
    color: var(--neutral-800);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
    font-size: 0.9em;
    border: 1px solid var(--neutral-200);
}

/* Enhanced syntax highlighting with better colors */
.code-example pre .keyword,
pre .keyword { 
    color: #ff79c6; 
    font-weight: 500;
}

.code-example pre .string,
pre .string { 
    color: #f1fa8c; 
    font-weight: 400;
}

.code-example pre .comment,
pre .comment { 
    color: #6272a4; 
    font-style: italic;
    font-weight: 400;
}

.code-example pre .function,
pre .function { 
    color: #50fa7b; 
    font-weight: 500;
}

.code-example pre .number,
pre .number { 
    color: #bd93f9; 
    font-weight: 400;
}

.code-example pre .operator,
pre .operator { 
    color: #ff79c6; 
    font-weight: 400;
}

.code-example pre .class,
pre .class { 
    color: #8be9fd; 
    font-weight: 500;
}

.code-example pre .variable,
pre .variable { 
    color: #f8f8f2; 
    font-weight: 400;
}

.code-example pre .include,
pre .include { 
    color: #ffb86c; 
    font-weight: 500;
}

/* Responsive code blocks */
@media (max-width: 768px) {
    .code-example pre,
    .code-content pre,
    pre {
        font-size: 0.9rem;
        padding: var(--spacing-6);
        line-height: 2.0;
        letter-spacing: 0.4px;
    }
    
    .code-example h4 {
        padding: var(--spacing-3) var(--spacing-4);
        font-size: var(--font-size-base);
    }
}

@media (max-width: 480px) {
    .code-example pre,
    .code-content pre,
    pre {
        font-size: 0.85rem;
        padding: var(--spacing-4);
        line-height: 1.8;
        letter-spacing: 0.3px;
    }
}