/* ===================================
   SIGNALBOARD - MAIN STYLESHEET
   Enterprise-grade customer feedback signal tracker
   Built for product teams, designed for clarity
   Author: Emmanuel Ahishakiye
   =================================== */

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

:root {
  /* Color System */
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-300: #a5b4fc;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --primary-800: #3730a3;
  --primary-900: #312e81;

  --secondary-500: #8b5cf6;
  --secondary-600: #7c3aed;

  --success-500: #10b981;
  --success-600: #059669;

  --warning-500: #f59e0b;
  --warning-600: #d97706;

  --error-500: #ef4444;
  --error-600: #dc2626;

  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 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;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --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);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --sidebar-width: 260px;
  --header-height: 72px;

  /* Theme Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
}

/* Dark Theme */
body.dark-theme {
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --bg-tertiary: #374151;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --border-color: #374151;
  --gray-50: #1f2937;
  --gray-100: #374151;
  --gray-200: #4b5563;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-family);
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition-base), color var(--transition-base);
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.hidden {
  display: none !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-width: 0;
}

/* ===================================
   APP LAYOUT
   =================================== */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* ===================================
   SIDEBAR
   =================================== */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
  transition: transform var(--transition-base);
}

.sidebar-header {
  padding: var(--spacing-xl) var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-subtitle {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin-left: 44px;
  font-weight: 500;
}

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

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

.nav-item:hover {
  background: var(--gray-100);
  color: var(--text-primary);
  transform: translateX(2px);
}

.nav-item.active {
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  color: white;
  box-shadow: var(--shadow-md);
}

.nav-item svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

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

.theme-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.theme-toggle svg {
  flex-shrink: 0;
}

.switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 24px;
  margin-left: auto;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--gray-300);
  transition: var(--transition-base);
  border-radius: var(--radius-full);
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: var(--transition-base);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

.switch input:checked + .slider {
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
}

.switch input:checked + .slider:before {
  transform: translateX(24px);
}

/* ===================================
   MAIN CONTENT
   =================================== */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: var(--spacing-2xl);
  max-width: 1400px;
  width: 100%;
}

.view {
  display: none;
  animation: fadeIn var(--transition-base);
}

.view.active {
  display: block;
}

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

.view-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-2xl);
}

.view-title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  margin-bottom: var(--spacing-xs);
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.view-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: 400;
}

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

/* ===================================
   BUTTONS
   =================================== */
.btn-primary,
.btn-secondary,
.btn-control,
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  white-space: nowrap;
  font-family: inherit;
}

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

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

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

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--gray-100);
  border-color: var(--gray-300);
}

.btn-control {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 2px dashed var(--border-color);
  padding: var(--spacing-xl);
  flex-direction: column;
  gap: var(--spacing-md);
  text-align: center;
  min-height: 160px;
  flex: 1;
}

.btn-control:hover {
  border-color: var(--primary-500);
  background: var(--primary-50);
  color: var(--primary-600);
}

.btn-control small {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  font-weight: 400;
}

.btn-icon {
  padding: var(--spacing-sm);
  background: transparent;
  color: var(--text-secondary);
}

.btn-icon:hover {
  background: var(--gray-100);
  color: var(--text-primary);
}

/* ===================================
   STATS GRID
   =================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.stat-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.stat-card:hover::before {
  opacity: 1;
}

.stat-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.stat-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.stat-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
}

.stat-value {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.stat-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.stat-change {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.stat-change.positive {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success-600);
}

.stat-change.negative {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error-600);
}

.stat-change.neutral {
  background: var(--gray-100);
  color: var(--gray-600);
}

.stat-progress {
  margin-top: var(--spacing-md);
}

.progress-bar {
  height: 8px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.progress-fill.success {
  background: linear-gradient(90deg, var(--success-500), var(--success-600));
}

.progress-fill.warning {
  background: linear-gradient(90deg, var(--warning-500), var(--warning-600));
}

.progress-fill.error {
  background: linear-gradient(90deg, var(--error-500), var(--error-600));
}

.progress-fill::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 HEADERS
   =================================== */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.section-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

/* ===================================
   SIGNALS/MEALS GRID
   =================================== */
.signals-grid,
.meals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.signal-card,
.meal-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.signal-card:hover,
.meal-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.signal-header,
.meal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.signal-title,
.meal-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.signal-source,
.meal-time {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.signal-meta,
.meal-macros {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.signal-metric,
.meal-macro {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.metric-label,
.macro-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.metric-value,
.macro-value {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
}

.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  text-align: center;
  color: var(--text-secondary);
}

.empty-state svg {
  margin-bottom: var(--spacing-lg);
}

.empty-state p {
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-base);
}

/* ===================================
   CAPTURE/CAMERA INTERFACE
   =================================== */
.capture-container,
.camera-container {
  max-width: 900px;
  margin: 0 auto;
}

.capture-options,
.camera-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.signal-form-container,
.analysis-results {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  border: 1px solid var(--border-color);
  margin-top: var(--spacing-xl);
  animation: slideUp var(--transition-base);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.video-container,
.preview-container {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: #000;
  margin-bottom: var(--spacing-xl);
}

#video-stream {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#preview-image {
  width: 100%;
  height: auto;
  display: block;
  max-height: 500px;
  object-fit: contain;
}

.camera-controls,
.preview-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-top: var(--spacing-lg);
}

/* ===================================
   FORMS
   =================================== */
.signal-form,
.meal-form,
.plan-form,
.profile-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.form-help {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

.form-input,
.form-textarea,
.form-select {
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--gray-400);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.form-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.portion-selector,
.portion-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

.portion-btn {
  flex: 1;
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-weight: 600;
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.portion-btn:hover {
  border-color: var(--primary-500);
  background: var(--primary-50);
}

.portion-btn.active {
  border-color: var(--primary-600);
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  color: white;
}

/* ===================================
   TIMELINE/HISTORY
   =================================== */
.timeline-list,
.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.timeline-item,
.history-item {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-fast);
}

.timeline-item:hover,
.history-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.history-info h4 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.history-meta {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.history-stats {
  display: flex;
  gap: var(--spacing-lg);
}

.history-stat {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.history-stat-value {
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.history-stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

/* ===================================
   BENCHMARKS/PLANS
   =================================== */
.benchmarks-list,
.plans-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.benchmark-card,
.plan-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 2px solid var(--border-color);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
}

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

.benchmark-card.active,
.plan-card.active {
  border-color: var(--primary-600);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.plan-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-lg);
}

.plan-name {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.plan-badge {
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  background: var(--primary-100);
  color: var(--primary-700);
}

.plan-goals {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.plan-goal {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.plan-goal-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.plan-goal-value {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

/* ===================================
   MODAL
   =================================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-xl);
  animation: fadeIn var(--transition-base);
}

.modal-content {
  background: var(--bg-primary);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-2xl);
  animation: slideUp var(--transition-base);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.modal-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
}

.modal-body {
  margin-bottom: var(--spacing-xl);
}

.modal-footer,
.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
}

/* ===================================
   PROFILE
   =================================== */
.profile-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  border: 1px solid var(--border-color);
  max-width: 700px;
}

.profile-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
}

.profile-avatar-wrapper {
  position: relative;
}

.profile-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

.profile-avatar-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
}

.profile-avatar-edit {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary-600);
  color: white;
  border: 3px solid var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.profile-avatar-edit:hover {
  transform: scale(1.1);
  background: var(--primary-700);
}

.profile-info {
  flex: 1;
}

.profile-name {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.profile-email {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
}

/* ===================================
   INSIGHTS CARDS
   =================================== */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.insight-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--border-color);
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.insight-card::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  transition: opacity var(--transition-base);
}

.insight-card.insight-success::before {
  background: linear-gradient(90deg, #10b981, #14b8a6);
}

.insight-card.insight-warning::before {
  background: linear-gradient(90deg, #f59e0b, #fb923c);
}

.insight-card.insight-alert::before {
  background: linear-gradient(90deg, #ef4444, #f87171);
}

.insight-card.insight-info::before {
  background: linear-gradient(90deg, #3b82f6, #60a5fa);
}

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

.insight-card:hover::before {
  height: 100%;
  opacity: 0.05;
}

.insight-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.insight-content {
  flex: 1;
}

.insight-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.insight-message {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===================================
   CHARTS
   =================================== */
.chart-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--border-color);
  margin-bottom: var(--spacing-lg);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.chart-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

.chart-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

canvas {
  max-width: 100%;
  display: block;
}

/* ===================================
   PREDICTIONS
   =================================== */
.predictions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--spacing-md);
}

.prediction-card {
  background: linear-gradient(135deg, #f9fafb, #ffffff);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
}

.prediction-card::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, #6366f1, #8b5cf6);
}

.prediction-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.prediction-date {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.prediction-value {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.prediction-confidence {
  margin-top: var(--spacing-md);
}

.confidence-bar {
  height: 4px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
}

.confidence-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981, #14b8a6);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* ===================================
   LOADING & TOAST
   =================================== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  animation: fadeIn var(--transition-base);
}

.loading-spinner {
  width: 64px;
  height: 64px;
  border: 4px solid rgba(255, 255, 255, 0.2);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-text {
  color: white;
  font-size: var(--font-size-lg);
  margin-top: var(--spacing-lg);
  font-weight: 500;
}

.toast {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  background: var(--gray-900);
  color: white;
  padding: var(--spacing-lg) var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2xl);
  z-index: 9998;
  animation: slideUp var(--transition-base);
  font-size: var(--font-size-sm);
  max-width: 400px;
}

body.dark-theme .toast {
  background: white;
  color: var(--gray-900);
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
    box-shadow: var(--shadow-2xl);
  }

  .main-content {
    margin-left: 0;
  }

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

  .insights-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-2xl: 2rem;
  }

  .main-content {
    padding: var(--spacing-lg);
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .view-header {
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: stretch;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .capture-options,
  .camera-options {
    grid-template-columns: 1fr;
  }

  .signals-grid,
  .meals-grid {
    grid-template-columns: 1fr;
  }

  .benchmarks-list,
  .plans-list {
    grid-template-columns: 1fr;
  }

  .history-item,
  .timeline-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .history-stats {
    width: 100%;
    justify-content: space-between;
  }

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

  .profile-header {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --sidebar-width: 100%;
    --spacing-xl: 1.5rem;
  }

  .view-title {
    font-size: var(--font-size-2xl);
  }

  .stat-value {
    font-size: var(--font-size-2xl);
  }

  .modal {
    padding: var(--spacing-md);
  }

  .modal-content {
    padding: var(--spacing-lg);
  }

  .toast {
    left: var(--spacing-md);
    right: var(--spacing-md);
    bottom: var(--spacing-md);
  }

  .predictions-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   SCROLLBAR STYLING
   =================================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-400);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-500);
}

body.dark-theme ::-webkit-scrollbar-thumb {
  background: var(--gray-600);
}

body.dark-theme ::-webkit-scrollbar-thumb:hover {
  background: var(--gray-500);
}

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

:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}

/* ===================================
   PRINT STYLES
   =================================== */
@media print {
  .sidebar,
  .view-header button,
  .btn-primary,
  .btn-secondary,
  .theme-toggle,
  .loading-overlay,
  .toast {
    display: none !important;
  }

  .main-content {
    margin-left: 0;
    padding: 0;
  }

  .stat-card,
  .signal-card,
  .meal-card,
  .insight-card {
    break-inside: avoid;
  }
}

/* ===================================
   STAT FOOTER (BACKWARD COMPATIBILITY)
   =================================== */
.stat-footer {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}