/**
 * VanillaForge - Main Styles
 * 
 * This file contains the core styling for the application including:
 * - CSS Custom Properties (CSS Variables) for theming
 * - Global reset and base styles
 * - Layout styles
 * - Loading states
 * - Error boundaries
 * - Responsive design utilities
 * 
 * @author VanillaForge Team
 * @version 3.0.0
 */

/* ===========================
   CSS Custom Properties (Variables)
   =========================== */
:root {
  /* Primary Color Palette */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-900: #1e3a8a;

  /* Secondary Color Palette */
  --color-secondary: #64748b;
  --color-secondary-dark: #475569;
  --color-secondary-light: #94a3b8;

  /* Semantic Colors */
  --color-success: #059669;
  --color-success-light: #10b981;
  --color-warning: #d97706;
  --color-warning-light: #f59e0b;
  --color-error: #dc2626;
  --color-error-light: #ef4444;
  --color-info: #0891b2;
  --color-info-light: #06b6d4;

  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, Inconsolata, 'Roboto Mono', 'Courier New', monospace;

  /* Font Sizes */
  --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 Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --spacing-0: 0;
  --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;
  --spacing-24: 6rem;

  /* Border Radius */
  --border-radius-sm: 0.125rem;
  --border-radius: 0.25rem;
  --border-radius-md: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 0.75rem;
  --border-radius-2xl: 1rem;
  --border-radius-full: 9999px;

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

  /* Z-Index Scale */
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  --z-index-toast: 1080;
}

/* ===========================
   Global Reset & Base Styles
   =========================== */

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

html {
  height: 100%;
  font-size: 16px;
  line-height: var(--line-height-normal);
  -webkit-text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
}

body {
  height: 100%;
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-gray-800);
  background-color: var(--color-gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Remove default button styles */
button {
  background: none;
  border: none;
  font: inherit;
  cursor: pointer;
}

/* Remove default list styles */
ul, ol {
  list-style: none;
}

/* Remove default link styles */
a {
  color: inherit;
  text-decoration: none;
}

/* Improve media defaults */
img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Remove default form element styles */
input, button, textarea, select {
  font: inherit;
}

/* ===========================
   Layout Styles
   =========================== */

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-white);
}

.main-content {
  flex: 1;
  padding: var(--spacing-4);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.app-footer {
  background-color: var(--color-gray-800);
  color: var(--color-white);
  padding: var(--spacing-4);
  text-align: center;
  font-size: var(--font-size-sm);
}

/* ===========================
   Loading Screen Styles
   =========================== */

.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-index-modal);
}

.loading-spinner {
  text-align: center;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-gray-200);
  border-top: 4px solid var(--color-primary);
  border-radius: var(--border-radius-full);
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-4);
}

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

.loading-spinner p {
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* ===========================
   Error Boundary Styles
   =========================== */

.error-boundary {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-index-modal);
}

.error-content {
  text-align: center;
  padding: var(--spacing-8);
  max-width: 500px;
}

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

.error-content p {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-6);
  line-height: var(--line-height-relaxed);
}

#refresh-button {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-3) var(--spacing-6);
  border-radius: var(--border-radius-md);
  font-weight: var(--font-weight-medium);
  transition: background-color var(--transition-fast);
}

#refresh-button:hover {
  background-color: var(--color-primary-dark);
}

/* ===========================
   Toast Notifications
   =========================== */

.toast-container {
  position: fixed;
  top: var(--spacing-4);
  right: var(--spacing-4);
  z-index: var(--z-index-toast);
  max-width: 400px;
  width: 100%;
}

.toast {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-4);
  margin-bottom: var(--spacing-2);
  border-left: 4px solid var(--color-info);
  animation: slideInRight 0.3s ease-out;
}

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

.toast.warning {
  border-left-color: var(--color-warning);
}

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

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* ===========================
   Modal Container
   =========================== */

.modal-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-index-modal);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-container.show {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--color-white);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow: auto;
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal-container.show .modal {
  transform: scale(1);
}

/* ===========================
   Utility Classes
   =========================== */

/* Display utilities */
.hidden { display: none !important; }
.block { display: block !important; }
.inline { display: inline !important; }
.inline-block { display: inline-block !important; }
.flex { display: flex !important; }
.inline-flex { display: inline-flex !important; }
.grid { display: grid !important; }

/* Flexbox utilities */
.flex-row { flex-direction: row !important; }
.flex-col { flex-direction: column !important; }
.flex-wrap { flex-wrap: wrap !important; }
.items-center { align-items: center !important; }
.items-start { align-items: flex-start !important; }
.items-end { align-items: flex-end !important; }
.justify-center { justify-content: center !important; }
.justify-between { justify-content: space-between !important; }
.justify-start { justify-content: flex-start !important; }
.justify-end { justify-content: flex-end !important; }

/* Text utilities */
.text-left { text-align: left !important; }
.text-center { text-align: center !important; }
.text-right { text-align: right !important; }
.text-xs { font-size: var(--font-size-xs) !important; }
.text-sm { font-size: var(--font-size-sm) !important; }
.text-base { font-size: var(--font-size-base) !important; }
.text-lg { font-size: var(--font-size-lg) !important; }
.text-xl { font-size: var(--font-size-xl) !important; }
.text-2xl { font-size: var(--font-size-2xl) !important; }
.text-3xl { font-size: var(--font-size-3xl) !important; }
.text-4xl { font-size: var(--font-size-4xl) !important; }

/* Font weight utilities */
.font-light { font-weight: var(--font-weight-light) !important; }
.font-normal { font-weight: var(--font-weight-normal) !important; }
.font-medium { font-weight: var(--font-weight-medium) !important; }
.font-semibold { font-weight: var(--font-weight-semibold) !important; }
.font-bold { font-weight: var(--font-weight-bold) !important; }

/* Color utilities */
.text-primary { color: var(--color-primary) !important; }
.text-secondary { color: var(--color-secondary) !important; }
.text-success { color: var(--color-success) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-error { color: var(--color-error) !important; }
.text-info { color: var(--color-info) !important; }
.text-gray-500 { color: var(--color-gray-500) !important; }
.text-gray-600 { color: var(--color-gray-600) !important; }
.text-gray-700 { color: var(--color-gray-700) !important; }
.text-gray-800 { color: var(--color-gray-800) !important; }
.text-white { color: var(--color-white) !important; }

/* Background utilities */
.bg-primary { background-color: var(--color-primary) !important; }
.bg-secondary { background-color: var(--color-secondary) !important; }
.bg-success { background-color: var(--color-success) !important; }
.bg-warning { background-color: var(--color-warning) !important; }
.bg-error { background-color: var(--color-error) !important; }
.bg-info { background-color: var(--color-info) !important; }
.bg-white { background-color: var(--color-white) !important; }
.bg-gray-50 { background-color: var(--color-gray-50) !important; }
.bg-gray-100 { background-color: var(--color-gray-100) !important; }

/* Spacing utilities */
.m-0 { margin: var(--spacing-0) !important; }
.m-1 { margin: var(--spacing-1) !important; }
.m-2 { margin: var(--spacing-2) !important; }
.m-3 { margin: var(--spacing-3) !important; }
.m-4 { margin: var(--spacing-4) !important; }
.m-6 { margin: var(--spacing-6) !important; }
.m-8 { margin: var(--spacing-8) !important; }

.p-0 { padding: var(--spacing-0) !important; }
.p-1 { padding: var(--spacing-1) !important; }
.p-2 { padding: var(--spacing-2) !important; }
.p-3 { padding: var(--spacing-3) !important; }
.p-4 { padding: var(--spacing-4) !important; }
.p-6 { padding: var(--spacing-6) !important; }
.p-8 { padding: var(--spacing-8) !important; }

/* Border radius utilities */
.rounded { border-radius: var(--border-radius) !important; }
.rounded-md { border-radius: var(--border-radius-md) !important; }
.rounded-lg { border-radius: var(--border-radius-lg) !important; }
.rounded-xl { border-radius: var(--border-radius-xl) !important; }
.rounded-full { border-radius: var(--border-radius-full) !important; }

/* Shadow utilities */
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow { box-shadow: var(--shadow) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !important; }

/* ===========================
   Responsive Design
   =========================== */

/* Mobile First Approach */
@media (min-width: 640px) {
  .sm\:block { display: block !important; }
  .sm\:hidden { display: none !important; }
  .sm\:flex { display: flex !important; }
}

@media (min-width: 768px) {
  .md\:block { display: block !important; }
  .md\:hidden { display: none !important; }
  .md\:flex { display: flex !important; }
  .md\:text-lg { font-size: var(--font-size-lg) !important; }
  .md\:text-xl { font-size: var(--font-size-xl) !important; }
}

@media (min-width: 1024px) {
  .lg\:block { display: block !important; }
  .lg\:hidden { display: none !important; }
  .lg\:flex { display: flex !important; }
}

@media (min-width: 1280px) {
  .xl\:block { display: block !important; }
  .xl\:hidden { display: none !important; }
  .xl\:flex { display: flex !important; }
}

/* ===========================
   Accessibility Improvements
   =========================== */

/* Focus styles for keyboard navigation */
:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-primary: #0000ff;
    --color-error: #ff0000;
    --color-success: #008000;
    --color-warning: #ff8000;
  }
}

/* Dark mode support (will be implemented in themes.css) */
@media (prefers-color-scheme: dark) {
  /* Dark mode variables will be defined in themes.css */
}