/**
 * Copyright 2025 Armando Sori
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Main Styles for SimulateAI Educational Platform
 * Modern, accessible, and responsive design
 */

/* Import additional stylesheets */
@import './category-grid.css';
@import './scenario-modal.css';
@import './onboarding-tour.css';
@import './pre-launch-modal.css';
@import './enhanced-simulation-modal.css';
@import './post-simulation-modal.css';

/* CSS Custom Properties */
:root {
  /* Colors */
  --color-primary: #007cba;
  --color-primary-dark: #005a87;
  --color-primary-light: #4da6d9;
  --color-secondary: #00aa00;
  --color-secondary-dark: #008800;
  --color-accent: #ff6b35;
  --color-accent-300: #ff9766;
  --color-accent-400: #ff8150;
  --color-accent-600: #e55a2b;
  --color-accent-700: #cc4f24;
  --color-warning: #ffaa00;
  --color-error: #ff4444;
  --color-success: #4caf50;

  /* Neutrals */
  --color-white: #ffffff;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #eeeeee;
  --color-gray-300: #e0e0e0;
  --color-gray-400: #bdbdbd;
  --color-gray-500: #9e9e9e;
  --color-gray-600: #757575;
  --color-gray-700: #616161;
  --color-gray-800: #424242;
  --color-gray-900: #212121;
  --color-black: #000000;

  /* Typography */
  --font-family-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-family-mono: 'Consolas', 'Monaco', 'Courier New', monospace;

  --font-size-xs: 0.75rem; /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-lg: 1.125rem; /* 18px */
  --font-size-xl: 1.25rem; /* 20px */
  --font-size-2xl: 1.5rem; /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem; /* 36px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --spacing-1: 0.25rem; /* 4px */
  --spacing-2: 0.5rem; /* 8px */
  --spacing-3: 0.75rem; /* 12px */
  --spacing-4: 1rem; /* 16px */
  --spacing-5: 1.25rem; /* 20px */
  --spacing-6: 1.5rem; /* 24px */
  --spacing-8: 2rem; /* 32px */
  --spacing-10: 2.5rem; /* 40px */
  --spacing-12: 3rem; /* 48px */
  --spacing-16: 4rem; /* 64px */
  --spacing-20: 5rem; /* 80px */

  /* Breakpoints */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;

  /* Container Sizes */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base:
    0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --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);

  /* Border radius */
  --radius-sm: 0.125rem; /* 2px */
  --radius-base: 0.25rem; /* 4px */
  --radius-md: 0.375rem; /* 6px */
  --radius-lg: 0.5rem; /* 8px */
  --radius-xl: 0.75rem; /* 12px */
  --radius-2xl: 1rem; /* 16px */
  --radius-full: 9999px;
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

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

html {
  scroll-behavior: smooth;
  /* Explicitly prevent scroll snap on the page level */
  scroll-snap-type: none;
  /* Prevent horizontal overflow */
  overflow-x: hidden;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-gray-900);
  background-color: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Explicitly prevent scroll snap on the page level */
  scroll-snap-type: none;
  /* Prevent horizontal overflow */
  overflow-x: hidden;
  /* Add padding for fixed header */
  padding-top: 80px; /* Approximate header height */
}

/* Force scroll position reset on page load */
html {
  scroll-behavior: auto; /* Temporarily disable smooth scrolling for immediate positioning */
}

html.loaded {
  scroll-behavior: smooth; /* Re-enable smooth scrolling after page loads */
}

/* Ensure page always starts at top */
body {
  overflow-anchor: none; /* Prevent scroll anchoring that might restore position */
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-base);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  z-index: 9999;
  transition: top var(--transition-fast);
}

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

/* Header */
.header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  transform: translateY(0);
  transition: transform 0.3s ease-in-out;
}

.header.header-hidden {
  transform: translateY(-100%);
}

.header.header-visible {
  transform: translateY(0);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4);
  padding: var(--spacing-4) var(--spacing-4);
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  flex-shrink: 0; /* Prevent logo from shrinking */
}

.logo-image {
  width: 40px;
  height: 40px;
}

.site-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

/* Mobile Navigation System */
.main-nav {
  /* Mobile-first: hidden by default */
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  background: var(--color-white);
  border-left: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-lg);
  z-index: 1001;
  transition: right var(--transition-base);
  overflow-y: auto;
}

.main-nav.open {
  right: 0;
}

.nav-list {
  list-style: none;
  padding: var(--spacing-8) var(--spacing-6) var(--spacing-6);
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

/* Hamburger Menu Button */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-base);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  z-index: 1002; /* Above the nav menu */
}

.nav-toggle:hover,
.nav-toggle:focus {
  background-color: var(--color-gray-50);
  border-color: var(--color-primary);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Hamburger Icon Lines */
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-gray-700);
  border-radius: 1px;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-toggle span:nth-child(1) {
  transform: translateY(-6px);
}

.nav-toggle span:nth-child(2) {
  transform: translateY(0);
}

.nav-toggle span:nth-child(3) {
  transform: translateY(6px);
}

/* Hamburger Animation - Active State */
.nav-toggle.active span:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(-20px);
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(0) rotate(-45deg);
}

/* Mobile Navigation Backdrop */
.nav-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--transition-base),
    visibility var(--transition-base);
  backdrop-filter: blur(2px);
}

.nav-backdrop.open {
  opacity: 1;
  visibility: visible;
}

/* Removed .nav-close button - using hamburger transform instead */

.nav-link {
  color: var(--color-gray-700);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-base);
  transition: all var(--transition-fast);
  display: block;
  position: relative;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--color-primary);
  background-color: var(--color-gray-50);
}

.nav-link.active {
  color: var(--color-primary);
  background-color: rgba(0, 124, 186, 0.1);
  font-weight: var(--font-weight-semibold);
}

.nav-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--color-primary);
  border-radius: 0 2px 2px 0;
}

/* Surprise Me Button Styles */
.nav-link.surprise-me-btn {
  background: linear-gradient(135deg, #ff6b6b, #feca57);
  color: white;
  font-weight: var(--font-weight-semibold);
  border-radius: var(--border-radius-md);
  margin-top: var(--spacing-2);
  position: relative;
  overflow: hidden;
  animation: subtle-glow 3s ease-in-out infinite alternate;
}

.nav-link.surprise-me-btn:hover,
.nav-link.surprise-me-btn:focus {
  background: linear-gradient(135deg, #ff5252, #ffc107);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.nav-link.surprise-me-btn::before {
  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 0.6s ease;
}

.nav-link.surprise-me-btn:hover::before {
  left: 100%;
}

@keyframes subtle-glow {
  0% {
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.2);
  }
  100% {
    box-shadow: 0 2px 12px rgba(255, 107, 107, 0.4);
  }
}

/* Mega Menu Styles */
.nav-item-dropdown {
  position: relative;
}

.nav-item-dropdown .nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dropdown-arrow {
  font-size: 0.8em;
  transition: transform var(--transition-fast);
  margin-left: var(--spacing-2);
}

.nav-item-dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.nav-item-dropdown[aria-expanded="true"] .dropdown-arrow {
  transform: rotate(180deg);
}

.mega-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 700px;
  max-width: 800px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: 1050;
  margin-top: var(--spacing-2);
}

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

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

.mega-menu-header {
  text-align: center;
  margin-bottom: var(--spacing-6);
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--color-gray-200);
}

.mega-menu-header h3 {
  margin: 0 0 var(--spacing-2) 0;
  color: var(--color-gray-900);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

.mega-menu-header p {
  margin: 0;
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
}

.mega-menu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-6);
  max-height: 400px;
  overflow-y: auto;
}

.mega-menu-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-4);
  border-radius: var(--radius-base);
  text-decoration: none;
  color: var(--color-gray-700);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

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

.mega-menu-icon {
  font-size: 1.5em;
  flex-shrink: 0;
}

.mega-menu-text h4 {
  margin: 0 0 var(--spacing-1) 0;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: inherit;
}

.mega-menu-text p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  line-height: 1.4;
}

.mega-menu-footer {
  text-align: center;
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-gray-200);
}

.mega-menu-view-all {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-base);
  transition: all var(--transition-fast);
  display: inline-block;
}

.mega-menu-view-all:hover {
  background: var(--color-gray-50);
  transform: translateX(2px);
}

/* Search filter for mega menu */
.mega-menu-filter {
  margin-top: var(--spacing-3);
  display: none; /* Hidden by default, shown on mobile */
}

.mega-menu-search {
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-base);
  font-size: var(--font-size-sm);
  background: var(--color-white);
  transition: border-color var(--transition-fast);
}

.mega-menu-search:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.mega-menu-search::placeholder {
  color: var(--color-gray-500);
}

/* Show search filter on mobile */
@media (max-width: 768px) {
  .mega-menu-filter {
    display: block;
  }
}

/* Mobile responsive mega menu styles - Simple Dropdown */
@media (max-width: 768px) {
  .mega-menu {
    position: absolute;
    top: 100%;
    left: var(--spacing-4);
    right: var(--spacing-4);
    width: calc(280px - 2 * var(--spacing-4)); /* Mobile nav width minus padding */
    max-width: calc(280px - 2 * var(--spacing-4));
    margin-left: calc(-1 * var(--spacing-4)); /* Align with nav content padding */
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-base);
    box-shadow: var(--shadow-lg);
    z-index: 1002; /* Above mobile nav */
    margin-top: var(--spacing-1);
    display: block;
    max-height: 60vh;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    box-sizing: border-box;
    /* Mobile visibility */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
  }

  /* Override desktop hover behavior on mobile */
  .nav-item-dropdown:hover .mega-menu {
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
  }

  /* Mobile open state */
  .nav-item-dropdown[aria-expanded="true"] .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .mega-menu-content {
    padding: 0;
    display: block;
    box-sizing: border-box;
    overflow-x: hidden;
  }

  .mega-menu-header {
    padding: var(--spacing-4) var(--spacing-3) var(--spacing-3) var(--spacing-3);
    border-bottom: 1px solid var(--color-gray-200);
    margin-bottom: var(--spacing-3);
    box-sizing: border-box;
    text-align: left;
  }

  .mega-menu-header h3 {
    font-size: var(--font-size-lg);
    margin: 0 0 var(--spacing-2) 0;
    color: var(--color-gray-900);
    font-weight: var(--font-weight-semibold);
  }

  .mega-menu-header p {
    font-size: var(--font-size-sm);
    margin: 0;
    color: var(--color-gray-600);
    line-height: 1.4;
  }

  /* Hide search filter on mobile dropdown */
  .mega-menu-filter {
    display: none;
  }

  .mega-menu-grid {
    display: block;
    max-height: none;
    overflow: visible;
    padding: 0;
  }

  .mega-menu-item {
    display: block;
    padding: var(--spacing-3);
    border: none;
    border-bottom: 1px solid var(--color-gray-100);
    margin: 0;
    border-radius: 0;
    background: var(--color-white);
    transition: background-color var(--transition-fast);
    text-decoration: none;
    color: var(--color-gray-700);
  }

  .mega-menu-item:last-child {
    border-bottom: none;
  }

  .mega-menu-item:hover,
  .mega-menu-item:focus {
    background: var(--color-gray-50);
    color: var(--color-primary);
  }

  .mega-menu-item:active {
    background: var(--color-gray-100);
  }

  .mega-menu-icon {
    display: inline-block;
    font-size: 1.2em;
    margin-right: var(--spacing-3);
    vertical-align: middle;
  }

  .mega-menu-text {
    display: inline-block;
    vertical-align: middle;
  }

  .mega-menu-text h4 {
    font-size: var(--font-size-sm);
    margin: 0;
    font-weight: var(--font-weight-medium);
    color: inherit;
  }

  .mega-menu-text p {
    font-size: var(--font-size-xs);
    margin: 0;
    color: var(--color-gray-600);
    line-height: 1.3;
  }

  .mega-menu-footer {
    padding: var(--spacing-3) var(--spacing-3) var(--spacing-4) var(--spacing-3);
    border-top: 1px solid var(--color-gray-200);
    margin-top: var(--spacing-3);
    box-sizing: border-box;
  }

  .mega-menu-view-all {
    display: block;
    width: calc(100% - var(--spacing-2));
    margin: 0 auto;
    text-align: center;
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--color-primary);
    color: var(--color-white);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-base);
    transition: all var(--transition-fast);
    font-size: var(--font-size-base);
    box-sizing: border-box;
  }

  .mega-menu-view-all:hover,
  .mega-menu-view-all:focus {
    background: var(--color-primary-dark);
    color: var(--color-white);
  }

  /* Ensure dropdown arrow is visible and rotates when open */
  .dropdown-arrow {
    transition: transform var(--transition-fast);
  }

  .nav-item-dropdown[aria-expanded="true"] .dropdown-arrow {
    transform: rotate(180deg);
  }
}

@media (max-width: 480px) {
  .mega-menu-content {
    padding: var(--spacing-3) 0;
  }

  .mega-menu-header {
    padding: var(--spacing-3) var(--spacing-3) var(--spacing-2) var(--spacing-3);
  }

  .mega-menu-header h3 {
    font-size: var(--font-size-base);
  }

  .mega-menu-header p {
    font-size: var(--font-size-xs);
  }

  .mega-menu-item {
    padding: var(--spacing-3) var(--spacing-3);
    gap: var(--spacing-3);
  }

  .mega-menu-icon {
    font-size: 1.3em;
    width: 36px;
    height: 36px;
  }

  .mega-menu-text h4 {
    font-size: var(--font-size-sm);
  }

  .mega-menu-text p {
    font-size: var(--font-size-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .mega-menu-footer {
    padding: var(--spacing-3);
  }

  .mega-menu-view-all {
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-sm);
  }
}

.btn-icon {
  background: none;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-base);
  padding: var(--spacing-2);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.btn-icon:hover,
.btn-icon:focus {
  background-color: var(--color-gray-50);
  border-color: var(--color-primary);
}

/* Main Content */
.main-content {
  min-height: 100vh;
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
}

/* Hero Section */
.hero {
  background: var(--color-white);
  color: var(--color-gray-900);
  display: grid;
  align-items: center;
  /* Mobile-first: responsive styles defined in media queries */
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-6);
}

.hero-description {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-8);
  color: var(--color-gray-800);
}

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

.hero-simulation {
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
}

.simulation-preview {
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* PRIMARY BUTTON SYSTEM - Use .btn-* classes for consistency */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  min-height: 44px; /* Accessibility touch target */
}

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

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover,
.btn-secondary:focus {
  background-color: var(--color-white);
  color: var(--color-primary);
}

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

.btn-outline:hover,
.btn-outline:focus {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* Override styles for test scenario modal button to match primary button */
#test-scenario-modal {
  /* Base button styles (since we removed .btn class) */
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  border: none !important;
  text-decoration: none !important;
  cursor: pointer !important;
  white-space: nowrap !important;
  font-family: var(--font-family-primary) !important;
  
  /* Match start-learning button exactly (.btn-primary styles) */
  background-color: var(--color-primary) !important;
  color: var(--color-white) !important;
  border: 2px solid var(--color-primary) !important;
  padding: var(--spacing-3) var(--spacing-6) !important;
  border-radius: var(--radius-lg) !important;
  font-weight: var(--font-weight-medium) !important;
  font-size: var(--font-size-base) !important;
  min-height: 44px !important;
  transition: all var(--transition-fast) !important;
  
  /* Ensure no outline on focus */
  outline: none !important;
}

#test-scenario-modal:hover,
#test-scenario-modal:focus {
  background-color: var(--color-primary-dark) !important;
  color: var(--color-white) !important;
  border-color: var(--color-primary-dark) !important;
  transform: translateY(-1px) !important;
  box-shadow: var(--shadow-md) !important;
}

/* Sections - Remove privacy, accessibility, contact from main sections */
.simulations-section,
.educator-section,
.about-section {
  background: #ffffff;
  color: #212121;
  padding: var(--spacing-20) var(--spacing-6);
  max-width: min(1280px, 100vw);
  width: 100%;
  margin: 0 auto;
  overflow-x: hidden; /* CRITICAL: Prevent any horizontal overflow */
  box-sizing: border-box;
  contain: layout style; /* Strict containment */
}

.section-header {
  text-align: center;
  margin-top: var(--spacing-20);
  margin-bottom: var(--spacing-16);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
}

.section-description {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

/* Mobile-specific section padding adjustments */
@media (max-width: 768px) {
  /* Adjust body padding for smaller header on tablets */
  body {
    padding-top: 95px !important; /* Increased padding with !important for tablet header */
  }
  
  .simulations-section,
  .educator-section,
  .about-section {
    padding: var(--spacing-16) var(--spacing-4);
    max-width: 100vw;
  }
}

@media (max-width: 480px) {
  /* Adjust body padding for smaller header on mobile */
  body {
    padding-top: 90px !important; /* Ensure adequate clearance for mobile header with !important */
  }
  
  .simulations-section,
  .educator-section,
  .about-section {
    padding: var(--spacing-12) var(--spacing-3);
    max-width: 100vw;
  }
}

/* Simulations Grid */
.simulations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-12);
}

.simulation-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
}

.simulation-card:hover,
.simulation-card:focus {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
  outline: none;
}

.card-thumbnail {
  position: relative;
  height: 200px;
  background: var(--color-gray-100);
  overflow: hidden;
}

.card-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.simulation-card:hover .card-thumbnail img {
  transform: scale(1.05);
}

.completion-badge {
  position: absolute;
  top: var(--spacing-3);
  right: var(--spacing-3);
  background: var(--color-success);
  color: var(--color-white);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
}

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

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-3);
}

.card-description {
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-4);
}

.card-meta {
  display: flex;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.difficulty {
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-base);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.difficulty-beginner {
  background: rgba(76, 175, 80, 0.1);
  color: var(--color-success);
}

.difficulty-intermediate {
  background: rgba(255, 170, 0, 0.1);
  color: var(--color-warning);
}

.difficulty-advanced {
  background: rgba(255, 68, 68, 0.1);
  color: var(--color-error);
}

.duration {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-6);
}

.tag {
  background: var(--color-gray-100);
  color: var(--color-gray-700);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-base);
  font-size: var(--font-size-xs);
}

.completion-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-3);
  background: var(--color-gray-50);
  border-radius: var(--radius-base);
  margin-bottom: var(--spacing-4);
}

.score {
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
}

.grade {
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-base);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
}

/* Educator Grid */
.educator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-8);
}

.educator-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--spacing-8);
  text-align: center;
  transition: all var(--transition-base);
}

.educator-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.educator-card h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
}

.educator-card p {
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-6);
}

/* Modal styles are handled by advanced-ui-components.css */
/* Keep only simulation-specific modal overrides here */

/* Simulation container for modal integration */
.modal-dialog .simulation-container {
  flex: 1;
  padding: var(--spacing-4);
  min-height: 400px;
  overflow: auto;
  background: var(--color-gray-50);
  border-radius: var(--spacing-2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-4);
}

.modal-dialog .simulation-container canvas {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

/* Consolidated simulation container styles */
.simulation-container {
  flex: 1;
  overflow: auto;
  position: relative;
  background: var(--color-gray-50);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;

  /* Ensure minimum dimensions for content */
  min-width: 200px;

  /* Handle overflow gracefully */
  overflow-x: auto;
  overflow-y: auto;

  /* Prevent content from breaking layout */
  word-wrap: break-word;
  hyphens: auto;

  /* Ensure proper scrolling behavior */
  scroll-behavior: smooth;

  /* Animation for smooth container transitions */
  transition:
    background-color 0.3s ease,
    border-color 0.3s ease;
}

/* Handle empty simulation container */
.simulation-container:empty::before {
  content: 'Loading simulation...';
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-gray-500);
  font-style: italic;
}

/* Improve canvas rendering within simulation container */
.simulation-container canvas {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  overflow: hidden !important; /* Fix CSS deprecation warning for Chart.js canvas elements */
}

/* Global fix for deprecated overflow: visible on media elements */
canvas, img, video {
  overflow: hidden !important; /* Prevent deprecated overflow: visible behavior */
}

/* Fix potential z-index issues */
.simulation-container .feedback-modal {
  z-index: 1001; /* Above the main modal */
}

/* Mobile-specific simulation container improvements */
@media (max-width: 768px) {
  .simulation-container {
    /* Ensure touch scrolling works well */
    -webkit-overflow-scrolling: touch;

    /* Prevent horizontal scroll on mobile */
    overflow-x: hidden;
  }

  /* Better handling of bias simulation on mobile */
  .simulation-container > .bias-simulation-enhanced {
    grid-template-columns: 1fr !important;
    grid-template-rows: auto auto auto;
    gap: 10px;
    padding: 10px;
  }
}

/* Small screen adjustments */
@media (max-width: 480px) {
  .simulation-container {
    min-height: 250px; /* Smaller minimum on very small screens */
  }

  .simulation-container > .bias-simulation-container {
    flex-direction: column !important;
    gap: 10px !important;
    padding: 10px !important;
  }
}

/* Loading state for simulation container */
.simulation-container.loading {
  position: relative;
  pointer-events: none;
}

.simulation-container.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

/* CSS Performance Optimizations */
.simulation-container,
.modal-dialog,
.simulation-card {
  contain: layout style;
  will-change: auto;
}

/* Better Scrollbar Styling for Webkit Browsers */
.simulation-container::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.simulation-container::-webkit-scrollbar-track {
  background: var(--color-gray-100);
  border-radius: var(--radius-base);
}

.simulation-container::-webkit-scrollbar-thumb {
  background: var(--color-gray-400);
  border-radius: var(--radius-base);
  border: 1px solid var(--color-gray-200);
}

.simulation-container::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* Enhanced Text Selection */
::selection {
  background: rgba(0, 124, 186, 0.2);
  color: var(--color-gray-900);
}

::-moz-selection {
  background: rgba(0, 124, 186, 0.2);
  color: var(--color-gray-900);
}

/* Improved Form Element Base Styles */
input,
textarea,
select,
button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* Better Image Loading */
img {
  max-width: 100%;
  height: auto;
  border-style: none;
}

/* Enhanced Table Styles for Data Display */
table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
}

th,
td {
  padding: var(--spacing-3);
  text-align: left;
  border-bottom: 1px solid var(--color-gray-200);
}

th {
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
  background: var(--color-gray-50);
}

/* Screen reader classes are defined in accessibility.css */
/* Removed duplicate .sr-only definition */

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

.font-bold {
  font-weight: var(--font-weight-bold);
}
.font-medium {
  font-weight: var(--font-weight-medium);
}
.font-normal {
  font-weight: var(--font-weight-normal);
}

.text-primary {
  color: var(--color-primary);
}
.text-error {
  color: var(--color-error);
}
.text-success {
  color: var(--color-success);
}
.text-warning {
  color: var(--color-warning);
}

.bg-primary {
  background-color: var(--color-primary);
}
.bg-gray-50 {
  background-color: var(--color-gray-50);
}
.bg-gray-100 {
  background-color: var(--color-gray-100);
}

.hidden {
  display: none !important;
}
.visible {
  visibility: visible;
}
.invisible {
  visibility: hidden;
}

/* Spacing Utilities */
.m-0 {
  margin: 0;
}
.mt-4 {
  margin-top: var(--spacing-4);
}
.mb-4 {
  margin-bottom: var(--spacing-4);
}
.ml-4 {
  margin-left: var(--spacing-4);
}
.mr-4 {
  margin-right: var(--spacing-4);
}

.p-0 {
  padding: 0;
}
.pt-4 {
  padding-top: var(--spacing-4);
}
.pb-4 {
  padding-bottom: var(--spacing-4);
}
.pl-4 {
  padding-left: var(--spacing-4);
}
.pr-4 {
  padding-right: var(--spacing-4);
}

/* Flexbox Utilities */
.flex {
  display: flex;
}
.inline-flex {
  display: inline-flex;
}
.flex-col {
  flex-direction: column;
}
.flex-row {
  flex-direction: row;
}
.items-center {
  align-items: center;
}
.justify-center {
  justify-content: center;
}
.justify-between {
  justify-content: space-between;
}
.flex-1 {
  flex: 1;
}
.flex-none {
  flex: none;
}

/* Grid Utilities */
.grid {
  display: grid;
}
.grid-cols-1 {
  grid-template-columns: repeat(1, 1fr);
}
.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}
.gap-4 {
  gap: var(--spacing-4);
}
.gap-8 {
  gap: var(--spacing-8);
}

/* Responsive Design - Mobile First */
@media (min-width: 640px) {
  .header-container {
    padding: 0 var(--spacing-6);
  }
}

@media (min-width: 768px) {
  .header-container {
    padding: 0 var(--spacing-8);
  }

  /* Desktop Navigation - Horizontal Layout */
  .nav-toggle {
    display: none; /* Hide hamburger on desktop */
  }

  .main-nav {
    position: static;
    width: auto;
    height: auto;
    background: transparent;
    border: none;
    box-shadow: none;
    z-index: auto;
    transition: none;
    overflow-y: visible;
    flex: 1;
    display: flex;
    justify-content: center;
  }

  .nav-list {
    padding: 0;
    flex-direction: row;
    gap: var(--spacing-1);
    align-items: center;
  }

  .nav-backdrop {
    display: none; /* No backdrop needed on desktop */
  }

  .nav-link {
    padding: var(--spacing-2) var(--spacing-4);
  }

  .nav-link.active::before {
    display: none; /* Remove mobile indicator */
  }

  .nav-link.active {
    background-color: rgba(0, 124, 186, 0.1);
    border-bottom: 2px solid var(--color-primary);
  }

  .hero {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-12);
    padding: var(--spacing-20) var(--spacing-8);
  }

  .simulations-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .header-container {
    padding: 0 var(--spacing-12);
    max-width: var(--container-xl);
    margin: 0 auto;
  }

  .hero {
    padding: var(--spacing-20) var(--spacing-12);
  }

  .simulations-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1280px) {
  .simulations-grid {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  }
}

/* Enhanced Professional Footer */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-100);
  margin-top: var(--spacing-20);
}

.footer-content {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: var(--spacing-16) var(--spacing-6);
}

/* Footer sections grid */
.footer-sections {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-12);
  margin-bottom: var(--spacing-12);
}

.footer-section {
  padding: var(--spacing-6);
}

.footer-section-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  margin-bottom: var(--spacing-4);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: var(--spacing-2);
  display: inline-block;
}

.footer-section-content {
  color: var(--color-gray-300);
  line-height: var(--line-height-relaxed);
}

.footer-section-content p {
  margin-bottom: var(--spacing-3);
  font-size: var(--font-size-sm);
}

.footer-list {
  list-style: none;
  padding: 0;
  margin: var(--spacing-4) 0;
}

.footer-list li {
  padding: var(--spacing-1) 0;
  font-size: var(--font-size-sm);
  position: relative;
  padding-left: var(--spacing-4);
}

.footer-list li::before {
  content: "•";
  color: var(--color-primary);
  position: absolute;
  left: 0;
  top: var(--spacing-1);
}

.footer-link {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover,
.footer-link:focus {
  color: var(--color-white);
  text-decoration: underline;
}

.contact-info {
  margin-top: var(--spacing-4);
  padding: var(--spacing-4);
  border-top: 1px solid var(--color-gray-700);
  background: var(--color-gray-800);
  border-radius: var(--border-radius-md);
  color: var(--color-gray-300);
}

.contact-info p {
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
  color: var(--color-gray-300);
}

.contact-info strong {
  color: var(--color-white);
}

/* Footer bottom section */
.footer-bottom {
  border-top: 1px solid var(--color-gray-700);
  padding-top: var(--spacing-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-4);
}

.footer-copyright {
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
  margin: 0;
}

.footer-nav {
  display: flex;
  gap: var(--spacing-6);
  flex-wrap: wrap;
}

.footer-nav-link {
  color: var(--color-gray-400);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
  padding: var(--spacing-1) var(--spacing-2);
}

.footer-nav-link:hover,
.footer-nav-link:focus {
  color: var(--color-primary-light);
}

/* Mobile responsiveness for footer */
@media (max-width: 768px) {
  .footer-content {
    padding: var(--spacing-12) var(--spacing-4);
  }
  
  .footer-sections {
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-3);
  }
  
  .footer-nav {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .footer-content {
    padding: var(--spacing-8) var(--spacing-3);
  }
  
  .footer-section {
    padding: var(--spacing-4);
  }
  
  .footer-nav {
    flex-direction: column;
    gap: var(--spacing-2);
  }
}

/* About section specific styles */
.about-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-8);
  margin-top: var(--spacing-12);
}

.about-card {
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-8);
  transition: transform var(--duration-200) ease;
}

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

.about-card h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
}

.about-card p {
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
}

/* Privacy and Accessibility sections content */
.privacy-content,
.accessibility-content,
.contact-content {
  max-width: 800px;
  margin: var(--spacing-12) auto 0;
  padding: 0 var(--spacing-4);
}

.privacy-content ul,
.accessibility-content ul,
.contact-content ul {
  list-style-type: disc;
  margin-left: var(--spacing-6);
  margin-top: var(--spacing-4);
}

.privacy-content li,
.accessibility-content li,
.contact-content li {
  margin-bottom: var(--spacing-2);
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
}

/* Contact section specific styles - REMOVED: conflicting with footer styling */

/* Print Styles */
@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  .header,
  .footer,
  .btn-icon,
  .modal-backdrop {
    display: none !important;
  }

  .simulation-card {
    break-inside: avoid;
    border: 1px solid #ccc;
    margin-bottom: 1rem;
  }

  .hero {
    background: none !important;
    color: black !important;
    padding: 1rem 0;
  }

  a {
    text-decoration: underline;
  }

  a[href^='http']:after {
    content: ' (' attr(href) ')';
    font-size: 0.8em;
    color: #666;
  }

  .simulation-container {
    border: 1px solid #ccc;
    height: auto !important;
    min-height: 200px;
  }
}

/* Focus Visible Enhancement for Better Keyboard Navigation */
.btn:focus-visible,
.nav-link:focus-visible,
.simulation-card:focus-visible,
.modal-close:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 124, 186, 0.2);
}

/* Improved Color Contrast for Better Accessibility */
.tag {
  background: var(--color-gray-200);
  color: var(--color-gray-800);
  border: 1px solid var(--color-gray-300);
}

.difficulty-beginner {
  background: rgba(76, 175, 80, 0.2);
  color: #2e7d32;
  border: 1px solid #4caf50;
}

.difficulty-intermediate {
  background: rgba(255, 170, 0, 0.2);
  color: #ef6c00;
  border: 1px solid #ff9800;
}

.difficulty-advanced {
  background: rgba(255, 68, 68, 0.2);
  color: #c62828;
  border: 1px solid #f44336;
}

/* Enhanced Error States */
.simulation-container.error {
  border: 2px solid var(--color-error);
  background: rgba(220, 53, 69, 0.1);
  color: var(--color-error);
}

.simulation-container.error::before {
  content: '⚠️ Error loading simulation. Please try again.';
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-error);
  font-weight: bold;
  text-align: center;
  padding: var(--spacing-4);
}

/* Error Boundary and Loading Components */
.error-boundary {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--transition-base),
    visibility var(--transition-base);
}

.error-boundary.visible {
  display: flex;
  opacity: 1;
  visibility: visible;
}

.error-boundary[aria-hidden='true'] {
  display: none !important;
}

.error-content {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-8);
  max-width: 500px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-xl);
}

.error-content h2 {
  color: var(--color-error);
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-2xl);
}

.error-message {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-6);
  line-height: var(--line-height-relaxed);
}

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

.loading {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  z-index: 9998;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--transition-base),
    visibility var(--transition-base);
}

.loading.visible {
  display: flex;
  opacity: 1;
  visibility: visible;
}

.loading[aria-hidden='true'] {
  display: none !important;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-gray-300);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-4);
}

.loading-text {
  color: var(--color-gray-600);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-4);
}

.loading-progress {
  width: 200px;
  height: 4px;
  background: var(--color-gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

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

/* Loading Spinner Enhancement */
.simulation-container.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-gray-300);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  z-index: 10;
}

@keyframes spin {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

/* Prevent animation in reduced motion mode */
@media (prefers-reduced-motion: reduce) {
  .simulation-container.loading::after {
    animation: none;
    content: 'Loading...';
    border: none;
    border-radius: 0;
    width: auto;
    height: auto;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
  }
}

/* Universal overflow prevention for mobile */
*, *::before, *::after {
  /* Prevent any element from creating horizontal overflow */
  max-width: 100%;
}

/* Specific overflow prevention for common culprits */
.simulations-grid,
.category-scenarios-grid,
.category-section {
  overflow-x: hidden;
}

/* Ensure no container exceeds viewport width */
.container {
  max-width: min(var(--container-xl), 100vw);
  width: 100%;
  box-sizing: border-box;
}

/* Critical mobile overflow prevention - ensure horizontal scroll never escapes containers */
@media (max-width: 768px) {
  /* Prevent any horizontal scroll from propagating to document */
  html, body {
    overflow-x: hidden !important;
    overscroll-behavior-x: none;
  }

  /* Ensure main content container strictly contains any overflow */
  .main-content {
    overflow-x: hidden !important;
  }

  /* Ensure all sections strictly contain overflow */
  .simulations-section,
  .hero,
  section {
    overflow-x: hidden !important;
    max-width: 100vw;
    box-sizing: border-box;
  }
}

/* Mobile dropdown mega menu - simple implementation */