frontend/src/index.css

/* 
 * Neural Network Quantizer - Design System
 * Premium glassmorphism dark theme with smooth animations
 */

/* ============================================
   CSS Variables - Design Tokens
   ============================================ */
/* Dark Theme (Default) */
:root {
  /* Colors - Dark Theme */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a25;
  --color-bg-elevated: #22222f;

  /* Glass effect backgrounds */
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-bg-hover: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-border-hover: rgba(255, 255, 255, 0.15);

  /* Accent colors */
  --color-accent-primary: #6366f1;
  --color-accent-secondary: #8b5cf6;
  --color-accent-tertiary: #a855f7;
  --color-accent-glow: rgba(99, 102, 241, 0.3);

  /* Status colors */
  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.1);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.1);
  --color-error: #ef4444;
  --color-error-bg: rgba(239, 68, 68, 0.1);
  --color-info: #06b6d4;
  --color-info-bg: rgba(6, 182, 212, 0.1);

  /* Text colors */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-muted: #475569;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-accent-secondary) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--color-accent-secondary) 0%, var(--color-accent-tertiary) 100%);
  --gradient-glow: radial-gradient(ellipse at center, var(--color-accent-glow) 0%, transparent 70%);
  --gradient-mesh: radial-gradient(at 40% 20%, hsla(228, 100%, 74%, 0.15) 0px, transparent 50%),
    radial-gradient(at 80% 0%, hsla(189, 100%, 56%, 0.1) 0px, transparent 50%),
    radial-gradient(at 0% 50%, hsla(355, 100%, 93%, 0.05) 0px, transparent 50%),
    radial-gradient(at 80% 50%, hsla(340, 100%, 76%, 0.1) 0px, transparent 50%);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* 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 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px var(--color-accent-glow);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --sidebar-width: 280px;
  --header-height: 64px;
  --max-content-width: 1400px;
}

/* Light Theme */
[data-theme="light"] {
  /* Colors - Light Theme */
  --color-bg-primary: #f8fafc;
  --color-bg-secondary: #ffffff;
  --color-bg-tertiary: #f1f5f9;
  --color-bg-elevated: #e2e8f0;

  /* Glass effect backgrounds - Frosty */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-bg-hover: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(0, 0, 0, 0.06);
  --glass-border-hover: rgba(0, 0, 0, 0.12);

  /* Text colors */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --text-muted: #94a3b8;

  /* Gradient tweaks for light mode */
  --color-accent-glow: rgba(99, 102, 241, 0.15);

  --gradient-mesh: radial-gradient(at 40% 20%, hsla(228, 100%, 74%, 0.10) 0px, transparent 50%),
    radial-gradient(at 80% 0%, hsla(189, 100%, 56%, 0.08) 0px, transparent 50%),
    radial-gradient(at 0% 50%, hsla(355, 100%, 93%, 0.08) 0px, transparent 50%),
    radial-gradient(at 80% 50%, hsla(340, 100%, 76%, 0.05) 0px, transparent 50%);

  /* Adjust shadows for light mode */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Background mesh gradient */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-mesh);
  pointer-events: none;
  z-index: -1;
}

#root {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================
   Typography
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

h1 {
  font-size: var(--text-4xl);
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
}

h6 {
  font-size: var(--text-base);
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-secondary);
}

code {
  font-family: var(--font-mono);
  background: var(--glass-bg);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

/* ============================================
   Glass Card Component
   ============================================ */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all var(--transition-base);
}

.glass-card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.glass-card.no-hover:hover {
  transform: none;
  box-shadow: none;
}

/* ============================================
   Button Styles
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md), 0 0 20px var(--color-accent-glow);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 30px var(--color-accent-glow);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--glass-bg);
  color: var(--text-primary);
}

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

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

.btn-lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--text-base);
}

.btn-sm {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-xs);
}

.btn-icon {
  padding: var(--space-sm);
  aspect-ratio: 1;
}

/* ============================================
   Input Styles
   ============================================ */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.input-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
}

.input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.input::placeholder {
  color: var(--text-muted);
}

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

/* Select dropdown */
.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-sm) center;
  background-size: 16px;
  padding-right: var(--space-xl);
}

/* Slider */
.slider {
  width: 100%;
  height: 6px;
  background: var(--glass-bg);
  border-radius: var(--radius-full);
  appearance: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--gradient-primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* ============================================
   Status Badges
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
}

.badge-success {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge-error {
  background: var(--color-error-bg);
  color: var(--color-error);
}

.badge-info {
  background: var(--color-info-bg);
  color: var(--color-info);
}

/* ============================================
   Layout Components
   ============================================ */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--color-bg-secondary);
  border-right: 1px solid var(--glass-border);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
}

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: var(--space-xl);
  max-width: calc(100vw - var(--sidebar-width));
}

.page-header {
  margin-bottom: var(--space-xl);
}

.page-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.page-subtitle {
  color: var(--text-secondary);
  font-size: var(--text-base);
}

/* Grid layout */
.grid {
  display: grid;
  gap: var(--space-lg);
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
    max-width: 100vw;
  }
}

/* ============================================
   Stats Card
   ============================================ */
.stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.stat-value {
  font-size: var(--text-3xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.stat-change {
  font-size: var(--text-xs);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.stat-change.positive {
  color: var(--color-success);
}

.stat-change.negative {
  color: var(--color-error);
}

/* ============================================
   Progress Bar
   ============================================ */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--glass-bg);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* ============================================
   Tabs
   ============================================ */
.tabs {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-xs);
  background: var(--glass-bg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.tab {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab:hover {
  color: var(--text-primary);
  background: var(--glass-bg-hover);
}

.tab.active {
  background: var(--gradient-primary);
  color: white;
}

/* ============================================
   Chart Container
   ============================================ */
.chart-container {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-md);
  min-height: 300px;
}

.chart-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

/* ============================================
   Loading States
   ============================================ */
.skeleton {
  background: linear-gradient(90deg,
      var(--glass-bg) 25%,
      var(--glass-bg-hover) 50%,
      var(--glass-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }

  100% {
    background-position: -200% 0;
  }
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--glass-border);
  border-top-color: var(--color-accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Tooltips
   ============================================ */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg-elevated);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

.animate-slide-up {
  animation: slideUp var(--transition-slow) ease-out;
}

.animate-scale-in {
  animation: scaleIn var(--transition-spring) ease-out;
}

/* Staggered animations */
.stagger>* {
  animation: slideUp var(--transition-slow) ease-out forwards;
  opacity: 0;
}

.stagger>*:nth-child(1) {
  animation-delay: 0ms;
}

.stagger>*:nth-child(2) {
  animation-delay: 50ms;
}

.stagger>*:nth-child(3) {
  animation-delay: 100ms;
}

.stagger>*:nth-child(4) {
  animation-delay: 150ms;
}

.stagger>*:nth-child(5) {
  animation-delay: 200ms;
}

.stagger>*:nth-child(6) {
  animation-delay: 250ms;
}

/* ============================================
   Scrollbar Styles
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--glass-border-hover);
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
  text-align: center;
}

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

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

.text-xs {
  font-size: var(--text-xs);
}

.text-muted {
  color: var(--text-secondary);
}

.text-accent {
  color: var(--color-accent-primary);
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

.gap-sm {
  gap: var(--space-sm);
}

.gap-md {
  gap: var(--space-md);
}

.gap-lg {
  gap: var(--space-lg);
}

.mt-sm {
  margin-top: var(--space-sm);
}

.mt-md {
  margin-top: var(--space-md);
}

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-sm {
  margin-bottom: var(--space-sm);
}

.mb-md {
  margin-bottom: var(--space-md);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

.w-full {
  width: 100%;
}

.h-full {
  height: 100%;
}

.overflow-hidden {
  overflow: hidden;
}

.overflow-auto {
  overflow: auto;
}

.relative {
  position: relative;
}

.absolute {
  position: absolute;
}

.rounded {
  border-radius: var(--radius-md);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.rounded-xl {
  border-radius: var(--radius-xl);
}

.shadow {
  box-shadow: var(--shadow-md);
}

.shadow-lg {
  box-shadow: var(--shadow-lg);
}

.shadow-glow {
  box-shadow: var(--shadow-glow);
}