/* ========================================
   🎨 Deep Roots Dashboard - Main Styles
   ======================================== */

/* CSS Variables */
:root {
  /* Colors */
  --primary-color: #2c5530;
  --secondary-color: #4CAF50;
  --accent-color: #66BB6A;
  --background-color: #fafafa;
  --surface-color: #ffffff;
  --text-primary: #212121;
  --text-secondary: #757575;
  --border-color: #e0e0e0;
  --shadow-light: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-medium: 0 4px 16px rgba(0,0,0,0.15);
  --shadow-heavy: 0 8px 32px rgba(0,0,0,0.2);
  
  /* Tool Colors */
  --inventory-color: #4CAF50;
  --grading-color: #FF9800;
  --scheduler-color: #2196F3;
  --tools-color: #9C27B0;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Sidebar */
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 60px;
  
  /* Animation */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --background-color: #121212;
  --surface-color: #1e1e1e;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --border-color: #333333;
}

/* ========================================
   ♿ Accessibility Utilities
   ======================================== */

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

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-color);
  color: white;
  padding: 8px 16px;
  z-index: 10000;
  text-decoration: none;
  font-weight: 600;
  border-radius: 0 0 var(--radius-md) 0;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

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

/* Remove outline for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

/* ========================================
   🏗️ Base Styles
   ======================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  height: 100%;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.6;
  height: 100%;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   🚀 Loading Screen
   ======================================== */

.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 1.4s ease, visibility 1.4s ease;
}

.loading-screen.fade-out {
  opacity: 0;
  visibility: hidden;
}

.intro-video {
  width: 50%;
  height: auto;
  object-fit: contain;
}

/* ========================================
   📱 App Layout
   ======================================== */

.app {
  display: flex;
  height: 100vh;
  transition: opacity var(--transition-medium);
}

.app.hidden {
  opacity: 0;
  pointer-events: none;
}

/* ========================================
   🎛️ Sidebar
   ======================================== */

.sidebar {
  width: var(--sidebar-width);
  background-color: var(--surface-color);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-medium), transform var(--transition-medium);
  z-index: 1000;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar.collapsed .logo-text,
.sidebar.collapsed .nav-text,
.sidebar.collapsed .nav-badge,
.sidebar.collapsed .nav-section h3,
.sidebar.collapsed .user-details,
.sidebar.collapsed .recent-queries,
.sidebar.collapsed .settings-btn {
  display: none;
}

.sidebar.collapsed .logo {
  justify-content: center;
}

.sidebar.collapsed .sidebar-header {
  justify-content: center;
}

.sidebar.collapsed .nav-item {
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-sm);
}

.sidebar.collapsed .user-info {
  justify-content: center;
}

.sidebar.collapsed .sidebar-footer {
  justify-content: center;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-weight: 600;
  font-size: 1.125rem;
}

.logo-icon {
  font-size: 1.5rem;
}

.sidebar-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.sidebar-toggle:hover {
  background-color: var(--border-color);
}

.sidebar-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background-color: var(--text-primary);
  margin: 3px 0;
  transition: var(--transition-fast);
}

/* ========================================
   🧭 Navigation
   ======================================== */

.sidebar-nav {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.nav-section {
  margin-bottom: var(--spacing-xl);
}

.nav-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.nav-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border: none;
  background: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: var(--spacing-xs);
  text-align: left;
  font-size: 0.875rem;
  font-weight: 500;
  position: relative;
}

.nav-item:hover {
  background-color: var(--border-color);
  transform: translateX(2px);
}

.nav-item.active {
  background-color: var(--secondary-color);
  color: white;
  box-shadow: var(--shadow-light);
}

.nav-item.active .nav-icon {
  filter: brightness(0) invert(1);
}

.nav-icon {
  font-size: 1.25rem;
  width: 24px;
  text-align: center;
}

.nav-text {
  flex: 1;
  font-weight: inherit;
}

.nav-badge {
  background-color: var(--border-color);
  color: var(--text-secondary);
  font-size: 0.625rem;
  padding: 0.125rem 0.375rem;
  border-radius: 999px;
  font-weight: 500;
}

.nav-item.active .nav-badge {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
}

/* Tool-specific colors */
.tool-item[data-tool="inventory"]:hover { background-color: var(--inventory-color); color: white; }
.tool-item[data-tool="grading"]:hover { background-color: var(--grading-color); color: white; }
.tool-item[data-tool="scheduler"]:hover { background-color: var(--scheduler-color); color: white; }
.tool-item[data-tool="tools"]:hover { background-color: var(--tools-color); color: white; }

/* ========================================
   📊 Usage View (full-page)
   ======================================== */

.usage-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  background: var(--background-color);
  padding: 2rem;
}

.usage-view.hidden { display: none; }

.usage-view-container {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.usage-view-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.usage-view-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-color);
  margin: 0;
}

.usage-plan-badge {
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--secondary-color);
  color: #fff;
}

.usage-status-line {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.usage-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.usage-card {
  background: var(--card-bg, var(--surface-color));
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.usage-ring-wrap {
  position: relative;
  width: 120px;
  height: 120px;
  margin-bottom: 1rem;
}

.usage-ring {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.usage-ring-bg {
  fill: none;
  stroke: var(--border-color);
  stroke-width: 8;
}

.usage-ring-fill {
  fill: none;
  stroke: var(--secondary-color);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 326.73;
  stroke-dashoffset: 326.73;
  transition: stroke-dashoffset 0.8s ease, stroke 0.3s ease;
}

.usage-ring-fill.warning { stroke: #f0ad4e; }
.usage-ring-fill.danger  { stroke: #d9534f; }

.usage-ring-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-color);
}

.usage-card-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.25rem;
}

.usage-card-detail {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.usage-billing-info {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 1rem 0;
  border-top: 1px solid var(--border-color);
}

@media (max-width: 640px) {
  .usage-cards {
    grid-template-columns: 1fr;
  }
  .usage-view {
    padding: 1rem;
  }
}

/* ========================================
   👤 Sidebar Footer
   ======================================== */

.sidebar-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.user-info {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--secondary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: white;
}

.user-details {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-weight: 600;
  font-size: 0.875rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-email {
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.settings-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 1.125rem;
  transition: background-color var(--transition-fast);
}

.settings-btn:hover {
  background-color: var(--border-color);
}

/* ========================================
   📱 Responsive Sidebar
   ======================================== */

@media (max-width: 1024px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    transform: translateX(-100%);
    box-shadow: var(--shadow-heavy);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .sidebar-toggle {
    display: block;
  }
}

/* ========================================
   🖥️ Main Content
   ======================================== */

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

/* ========================================
   📋 Header
   ======================================== */

.main-header {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.mobile-menu-btn:hover {
  background-color: var(--border-color);
}

.mobile-menu-btn span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  margin: 3px 0;
  transition: var(--transition-fast);
}

.header-title {
  flex: 1;
}

.header-title h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.header-title p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

.header-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 1.125rem;
  transition: background-color var(--transition-fast);
}

.header-btn:hover {
  background-color: var(--border-color);
}

.status-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--secondary-color);
  position: relative;
}

.status-indicator.online::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 50%;
  background-color: var(--secondary-color);
  opacity: 0.3;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 1; }
  70% { transform: scale(1); opacity: 0; }
  100% { transform: scale(0.95); opacity: 0; }
}

@media (max-width: 1024px) {
  .mobile-menu-btn {
    display: block;
  }
  
  .main-header {
    padding: var(--spacing-md) var(--spacing-lg);
  }
}

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

.hidden { display: none !important; }
.invisible { visibility: hidden !important; }
.sr-only { 
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================
   🎯 Focus & Accessibility
   ======================================== */

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

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