/**
 * Universal Dashboard Styles - Production Ready
 * Cross-platform compatible: Desktop, Mobile, PWA, Chrome, Edge, Safari
 * NO overlapping text, responsive, accessible
 */

/* ========== RESET & BASE ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --primary-color: #673AB7;
  --primary-dark: #512DA8;
  --primary-light: #9575CD;
  --secondary-color: #FF4081;
  --success-color: #4CAF50;
  --warning-color: #FF9800;
  --error-color: #F44336;
  --info-color: #2196F3;
  
  /* Neutrals */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F5;
  --bg-tertiary: #FAFAFA;
  --text-primary: #212121;
  --text-secondary: #757575;
  --text-tertiary: #9E9E9E;
  --border-color: #E0E0E0;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* Typography */
  --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-xxl: 32px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ========== LOADING OVERLAY ========== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  gap: var(--spacing-md);
}

.loading-overlay .spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loading-overlay p {
  color: var(--text-secondary);
  font-size: var(--font-size-md);
}

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

/* ========== LOADING STATE ========== */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xxl);
  gap: var(--spacing-md);
  min-height: 300px;
}

.loading-state .spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loading-state p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* ========== EMPTY STATE GUIDE ========== */
.empty-state-guide {
  max-width: 800px;
  margin: var(--spacing-xl) auto;
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}

.guide-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--border-color);
}

.guide-header i {
  font-size: 32px;
  color: var(--primary-color);
}

.guide-header h2 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  /* Prevent text overflow */
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

.guide-content {
  padding: var(--spacing-md) 0;
}

.guide-description {
  font-size: var(--font-size-md);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
  /* Prevent text overflow */
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.guide-actions {
  margin-bottom: var(--spacing-lg);
}

.guide-actions h3 {
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.guide-actions ul {
  list-style: none;
  padding: 0;
}

.guide-actions li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  /* Prevent text overflow */
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.guide-actions li i {
  color: var(--success-color);
  font-size: 20px;
  flex-shrink: 0;
}

.guide-cta {
  background: var(--bg-tertiary);
  padding: var(--spacing-lg);
  border-radius: 8px;
  text-align: center;
}

.guide-cta p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
}

.primary-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: var(--font-size-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.primary-button:active {
  transform: translateY(0);
}

.primary-button i {
  font-size: 20px;
}

/* ========== DASHBOARD LAYOUT ========== */
.dashboard-container {
  display: flex;
  min-height: 100vh;
  background: var(--bg-secondary);
}

/* ========== SIDEBAR ========== */
.sidebar {
  width: 260px;
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: var(--z-fixed);
  overflow-y: auto;
  transition: transform var(--transition-normal);
}

.sidebar-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-header .logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.sidebar-header .logo img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.sidebar-header .logo h1 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  /* Prevent text overflow */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-menu {
  flex: 1;
  padding: var(--spacing-md) 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  /* Prevent text overflow */
  white-space: nowrap;
  overflow: hidden;
}

.nav-link i {
  font-size: 24px;
  flex-shrink: 0;
}

.nav-link span {
  font-size: var(--font-size-sm);
  font-weight: 500;
  /* Prevent text overflow */
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.nav-link.active {
  background: rgba(103, 58, 183, 0.1);
  color: var(--primary-color);
  border-right: 3px solid var(--primary-color);
}

.sidebar-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

/* ========== MAIN CONTENT ========== */
.main-content {
  flex: 1;
  margin-left: 260px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.dashboard-header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  /* Prevent content overflow */
  flex-wrap: wrap;
}

.header-title h2 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  /* Prevent text overflow */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  /* Prevent overflow on small screens */
  flex-wrap: wrap;
}

.icon-button {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.icon-button:hover {
  background: var(--bg-tertiary);
  color: var(--primary-color);
}

.icon-button i {
  font-size: 24px;
}

/* ========== TAB CONTENT ========== */
.tab-content-container {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.tab-content {
  display: none;
  animation: fadeIn var(--transition-normal);
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ========== MOBILE STYLES ========== */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.active {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
    padding-bottom: 60px; /* Space for mobile nav */
  }
  
  .dashboard-header {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .header-title h2 {
    font-size: var(--font-size-lg);
  }
  
  .tab-content-container {
    padding: var(--spacing-md);
  }
  
  .empty-state-guide {
    margin: var(--spacing-md);
    padding: var(--spacing-md);
  }
  
  .guide-header h2 {
    font-size: var(--font-size-lg);
  }
  
  .guide-header i {
    font-size: 24px;
  }
}

/* ========== MOBILE NAVIGATION ========== */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xs) 0;
  z-index: var(--z-fixed);
  box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

.mobile-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  /* Prevent text overflow */
  min-width: 0;
}

.mobile-nav-item i {
  font-size: 24px;
}

.mobile-nav-item span {
  font-size: var(--font-size-xs);
  /* Prevent text overflow */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.mobile-nav-item.active {
  color: var(--primary-color);
}

@media (max-width: 768px) {
  .mobile-nav {
    display: flex;
  }
  
  .mobile-only {
    display: block !important;
  }
  
  .desktop-only {
    display: none !important;
  }
}

@media (min-width: 769px) {
  .mobile-only {
    display: none !important;
  }
  
  .desktop-only {
    display: block !important;
  }
}

/* ========== RESPONSIVE TYPOGRAPHY ========== */
@media (max-width: 480px) {
  :root {
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-md: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 20px;
    --font-size-xxl: 24px;
  }
}

/* ========== PRINT STYLES ========== */
@media print {
  .sidebar,
  .mobile-nav,
  .dashboard-header,
  .icon-button,
  .primary-button {
    display: none !important;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .tab-content {
    display: block !important;
  }
}

/* ========== ACCESSIBILITY ========== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

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

/* ========== HIGH CONTRAST MODE ========== */
@media (prefers-contrast: high) {
  :root {
    --border-color: #000000;
    --text-secondary: #000000;
  }
}

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

/* ========== DARK MODE SUPPORT ========== */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1E1E1E;
    --bg-secondary: #121212;
    --bg-tertiary: #2C2C2C;
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --text-tertiary: #808080;
    --border-color: #3C3C3C;
  }
}