:root {
  /* Primitive Color Tokens */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-cream-50: rgba(252, 252, 249, 1);
  --color-cream-100: rgba(255, 255, 253, 1);
  --color-gray-200: rgba(245, 245, 245, 1);
  --color-gray-300: rgba(167, 169, 169, 1);
  --color-gray-400: rgba(119, 124, 124, 1);
  --color-slate-500: rgba(98, 108, 113, 1);
  --color-brown-600: rgba(94, 82, 64, 1);
  --color-charcoal-700: rgba(31, 33, 33, 1);
  --color-charcoal-800: rgba(38, 40, 40, 1);
  --color-slate-900: rgba(19, 52, 59, 1);
  --color-teal-300: rgba(50, 184, 198, 1);
  --color-teal-400: rgba(45, 166, 178, 1);
  --color-teal-500: rgba(33, 128, 141, 1);
  --color-teal-600: rgba(29, 116, 128, 1);
  --color-teal-700: rgba(26, 104, 115, 1);
  --color-teal-800: rgba(41, 150, 161, 1);
  --color-red-400: rgba(255, 84, 89, 1);
  --color-red-500: rgba(192, 21, 47, 1);
  --color-orange-400: rgba(230, 129, 97, 1);
  --color-orange-500: rgba(168, 75, 47, 1);

  /* RGB versions for opacity control */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  --color-slate-500-rgb: 98, 108, 113;
  --color-red-500-rgb: 192, 21, 47;
  --color-red-400-rgb: 255, 84, 89;
  --color-orange-500-rgb: 168, 75, 47;
  --color-orange-400-rgb: 230, 129, 97;

  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-info: var(--color-slate-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);
  --color-select-caret: rgba(var(--color-slate-900-rgb), 0.8);
  --color-primary-rgb: var(--color-teal-500-rgb);

  /* Common style patterns */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;

  /* Typography */
  --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 28px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* Spacing */
  --space-0: 0;
  --space-1: 1px;
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04),
    0 2px 4px -1px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04),
    0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(0, 0, 0, 0.03);

  /* Animation */
  --duration-fast: 120ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: ease-in;
  --ease-out: ease-out;

  /* App specific */
  --header-height: 64px;
  --toolbar-height: 56px;
  --sidebar-width: 280px;
  --well-size: 48px;
  --well-gap: 4px;
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    --color-gray-400-rgb: 119, 124, 124;
    --color-teal-300-rgb: 50, 184, 198;
    --color-gray-300-rgb: 167, 169, 169;
    --color-gray-200-rgb: 245, 245, 245;

    --color-background: var(--color-charcoal-700);
    --color-surface: var(--color-charcoal-800);
    --color-text: var(--color-gray-200);
    --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
    --color-primary: var(--color-teal-300);
    --color-primary-hover: var(--color-teal-400);
    --color-primary-active: var(--color-teal-800);
    --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
    --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
    --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
    --color-border: rgba(var(--color-gray-400-rgb), 0.3);
    --color-error: var(--color-red-400);
    --color-success: var(--color-teal-300);
    --color-warning: var(--color-orange-400);
    --color-info: var(--color-gray-300);
    --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
    --color-btn-primary-text: var(--color-slate-900);
    --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
    --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
      inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);
  }
}

[data-theme="dark"] {
  --color-gray-400-rgb: 119, 124, 124;
  --color-teal-300-rgb: 50, 184, 198;
  --color-gray-300-rgb: 167, 169, 169;
  --color-gray-200-rgb: 245, 245, 245;

  --color-background: var(--color-charcoal-700);
  --color-surface: var(--color-charcoal-800);
  --color-text: var(--color-gray-200);
  --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
  --color-primary: var(--color-teal-300);
  --color-primary-hover: var(--color-teal-400);
  --color-primary-active: var(--color-teal-800);
  --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
  --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
  --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
  --color-border: rgba(var(--color-gray-400-rgb), 0.3);
  --color-error: var(--color-red-400);
  --color-success: var(--color-teal-300);
  --color-warning: var(--color-orange-400);
  --color-info: var(--color-gray-300);
  --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
  --color-btn-primary-text: var(--color-slate-900);
  --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
  --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.15);
  --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);
}

/* High Contrast Mode */
[data-high-contrast="true"] {
  --color-background: #000000;
  --color-surface: #000000;
  --color-text: #ffffff;
  --color-text-secondary: #ffffff;
  --color-border: #ffffff;
  --color-card-border: #ffffff;
  --shadow-sm: none;
  --shadow-md: none;
  --shadow-lg: none;
}

[data-high-contrast="true"] .well,
[data-high-contrast="true"] .btn,
[data-high-contrast="true"] .card {
  border: 2px solid #ffffff !important;
}

@font-face {
  font-family: 'FKGroteskNeue';
  src: url('https://r2cdn.perplexity.ai/fonts/FKGroteskNeue.woff2')
    format('woff2');
}

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

html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  padding: 0;
  transition: background-color var(--duration-normal) var(--ease-standard);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

h1 { font-size: var(--font-size-4xl); font-weight: var(--font-weight-bold); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-standard);
  border: none;
  text-decoration: none;
  position: relative;
  min-height: 44px;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

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

.btn--primary:hover {
  background: var(--color-primary-hover);
  transform: scale(1.02);
}

.btn--primary:active {
  background: var(--color-primary-active);
  transform: scale(0.98);
}

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

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

.btn--secondary:active {
  background: var(--color-secondary-active);
}

.btn--outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn--outline:hover {
  background: var(--color-secondary);
}

.btn--sm {
  padding: var(--space-6) var(--space-12);
  font-size: var(--font-size-sm);
  min-height: 32px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  border-radius: var(--radius-base);
  transition: all var(--duration-fast) var(--ease-standard);
}

.btn-icon:hover {
  background: var(--color-secondary);
}

.btn-icon:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* Form elements */
.form-control {
  display: block;
  width: 100%;
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: border-color var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
  min-height: 44px;
}

textarea.form-control {
  font-family: var(--font-family-base);
  resize: vertical;
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2'%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-12) center;
  background-size: 16px;
  padding-right: var(--space-32);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: var(--focus-outline);
}

.form-label {
  display: block;
  margin-bottom: var(--space-8);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.form-group {
  margin-bottom: var(--space-16);
}

/* Card component */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--duration-normal) var(--ease-standard);
  margin-bottom: var(--space-16);
}

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

.card__body {
  padding: var(--space-20);
}

.card__header {
  padding: var(--space-16) var(--space-20);
  border-bottom: 1px solid var(--color-card-border-inner);
}

.card__header h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

/* Header */
.app-header {
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 var(--space-24);
  transition: background-color var(--duration-normal) var(--ease-standard);
}

.header-content {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.header-actions {
  display: flex;
  gap: var(--space-8);
}

/* Toolbar */
.toolbar {
  height: var(--toolbar-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 var(--space-24);
  gap: var(--space-16);
  overflow-x: auto;
  transition: background-color var(--duration-normal) var(--ease-standard);
}

.toolbar-section {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.toolbar-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: var(--space-4);
}

.toolbar-divider {
  width: 1px;
  height: 32px;
  background: var(--color-border);
  margin: 0 var(--space-8);
}

/* Main Layout */
.app-main {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr var(--sidebar-width);
  height: calc(100vh - var(--header-height) - var(--toolbar-height));
  overflow: hidden;
}

/* Sidebars */
.sidebar {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  transition: transform var(--duration-slow) var(--ease-standard),
              background-color var(--duration-normal) var(--ease-standard);
  position: relative;
}

.sidebar--right {
  border-right: none;
  border-left: 1px solid var(--color-border);
}

.sidebar-toggle {
  display: none;
  position: absolute;
  top: var(--space-16);
  right: var(--space-16);
  z-index: 10;
}

.sidebar-content {
  padding: var(--space-24);
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-24);
  padding-bottom: var(--space-16);
  border-bottom: 2px solid var(--color-border);
}

.sidebar-header svg {
  color: var(--color-primary);
}

.sidebar-header h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

.sidebar-section {
  margin-top: var(--space-32);
  padding-top: var(--space-24);
  border-top: 1px solid var(--color-border);
}

.sidebar-section-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-16);
}

/* Category List */
.category-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.category-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-12);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-standard);
  background: var(--color-surface);
}

.category-item:hover {
  background: var(--color-secondary);
  transform: translateX(4px);
}

.category-item.active {
    border-color: var(--color-primary);
    background-color: rgba(var(--color-primary-rgb), 0.1); /* Fallback or calculate if var missing */
    box-shadow: 0 0 0 2px var(--color-primary);
}

.add-category-item {
    border-style: dashed;
    border-color: var(--color-text-secondary);
    opacity: 0.8;
}

.add-category-item:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    opacity: 1;
}

.btn-icon-sm {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 16px;
    padding: 0 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon-sm:hover {
    color: var(--color-error);
    background-color: rgba(var(--color-error-rgb), 0.1);
}

.category-info {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.category-color {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xs);
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.category-name {
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
}

.category-count {
  background: var(--color-secondary);
  color: var(--color-text);
  padding: var(--space-2) var(--space-8);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* Legend */
.legend {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.legend-color {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-base);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.legend-label {
  font-size: var(--font-size-base);
}

/* Statistics */
.stat-item {
  display: flex;
  justify-content: space-between;
  padding: var(--space-12) 0;
  border-bottom: 1px solid var(--color-card-border-inner);
}

.stat-item:last-child {
  border-bottom: none;
}

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

.stat-value {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  color: var(--color-text);
}

.category-stats {
  margin-top: var(--space-16);
  padding-top: var(--space-16);
  border-top: 1px solid var(--color-card-border-inner);
}

/* Grid Area */
.grid-area {
  background: var(--color-background);
  padding: var(--space-32);
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--duration-normal) var(--ease-standard);
}

.grid-container {
  display: inline-block;
}

.plate-grid {
  display: grid;
  grid-template-columns: auto repeat(12, var(--well-size));
  grid-template-rows: auto repeat(8, var(--well-size));
  gap: var(--well-gap);
  background: var(--color-surface);
  padding: var(--space-16);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  user-select: none;
}

.grid-header {
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background: rgba(var(--color-brown-600-rgb), 0.08);
  border-radius: var(--radius-sm);
  /* Proíbe usuário de selecionar os caracteres nesse local */
  user-select: none;
}

.well {
  width: var(--well-size);
  height: var(--well-size);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-standard);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xs);
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
  position: relative;
  user-select: none;
}

.well:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
  z-index: 5;
}

.well:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

.well.selected {
  border: 3px solid var(--color-primary);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1), 0 2px 8px rgba(0,0,0,0.2);
}

.well.has-annotation::after {
  content: '';
  position: absolute;
  top: 2px;
  right: 2px;
  width: 6px;
  height: 6px;
  background: var(--color-warning);
  border-radius: 50%;
  border: 1px solid white;
}

/* Empty State */
.empty-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-16);
  color: var(--color-text-secondary);
}

.empty-state.visible {
  display: flex;
}

.empty-state svg {
  opacity: 0.3;
}

.empty-state h3 {
  color: var(--color-text);
  margin-top: var(--space-8);
}

.empty-state p {
  max-width: 300px;
}

/* Selection Toolbar */
.selection-toolbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-top: 2px solid var(--color-primary);
  padding: var(--space-16) var(--space-24);
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
  transform: translateY(100%);
  transition: transform var(--duration-slow) var(--ease-standard);
  z-index: 100;
}

.selection-toolbar.visible {
  transform: translateY(0);
}

.selection-info {
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
}

.selection-actions {
  display: flex;
  gap: var(--space-12);
  align-items: center;
}

.selection-actions .form-control {
  width: auto;
  min-width: 200px;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: var(--space-24);
  right: var(--space-24);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
  pointer-events: none;
}

.toast {
  min-width: 300px;
  padding: var(--space-16);
  background: var(--color-surface);
  border-left: 4px solid var(--color-success);
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--space-12);
  pointer-events: auto;
  animation: slideIn var(--duration-slow) var(--ease-out);
}

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

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

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

.toast-icon {
  flex-shrink: 0;
}

.toast-content {
  flex: 1;
}

.toast-message {
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-4);
}

.toast-progress {
  height: 3px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--space-8);
}

.toast-progress-bar {
  height: 100%;
  background: var(--color-success);
  transition: width linear;
}

.toast-close {
  flex-shrink: 0;
}

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

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  animation: fadeIn var(--duration-slow) var(--ease-out);
}

.modal-backdrop.visible {
  display: flex;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow: auto;
  animation: scaleIn var(--duration-slow) var(--ease-out);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-20);
  border-bottom: 1px solid var(--color-border);
}

.modal-body {
  padding: var(--space-24);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-12);
  padding: var(--space-20);
  border-top: 1px solid var(--color-border);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* Dropdown Menu */
.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  padding: var(--space-8);
  display: none;
  z-index: 150;
  animation: fadeIn var(--duration-normal) var(--ease-out);
}

.dropdown-menu.visible {
  display: block;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  padding: var(--space-10) var(--space-12);
  border: none;
  background: transparent;
  color: var(--color-text);
  font-size: var(--font-size-base);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--duration-fast) var(--ease-standard);
  width: 100%;
  text-align: left;
}

.dropdown-item:hover {
  background: var(--color-secondary);
}

.dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-8) 0;
}

/* Tooltip */
.tooltip {
  position: absolute;
  background: rgba(0, 0, 0, 0.9);
  color: white;
  padding: var(--space-8) var(--space-12);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  pointer-events: none;
  z-index: 300;
  white-space: nowrap;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-standard);
}

.tooltip.visible {
  opacity: 1;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .app-main {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    position: fixed;
    top: calc(var(--header-height) + var(--toolbar-height));
    bottom: 0;
    width: var(--sidebar-width);
    z-index: 50;
    transform: translateX(-100%);
  }
  
  .sidebar--left.open {
    transform: translateX(0);
  }
  
  .sidebar--right {
    right: 0;
    transform: translateX(100%);
  }
  
  .sidebar--right.open {
    transform: translateX(0);
  }
  
  .sidebar-toggle {
    display: flex;
  }
  
  .toolbar {
    padding: 0 var(--space-12);
  }
  
  .toolbar-label {
    display: none;
  }
}

@media (max-width: 768px) {
  .app-title {
    font-size: var(--font-size-2xl);
  }
  
  .btn-text {
    display: none;
  }
  
  .toolbar-divider {
    display: none;
  }
  
  .grid-area {
    padding: var(--space-16);
  }
  
  .plate-grid {
    padding: var(--space-8);
  }

  :root {
    --well-size: 36px;
  }
  
  .selection-toolbar {
    flex-direction: column;
    gap: var(--space-12);
    align-items: stretch;
  }
  
  .selection-actions {
    flex-wrap: wrap;
  }
  
  .selection-actions .form-control {
    min-width: 100%;
  }
  
  .toast-container {
    bottom: var(--space-12);
    right: var(--space-12);
    left: var(--space-12);
  }
  
  .toast {
    min-width: auto;
  }
}

@media (max-width: 480px) {
  :root {
    --well-size: 28px;
    --well-gap: 2px;
  }
  
  .app-header {
    padding: 0 var(--space-16);
  }
  
  .toolbar {
    gap: var(--space-8);
  }
  
  .sidebar {
    width: 100%;
  }
}

/* Lift toasts above the selection toolbar when it is visible */
.toast-container--lifted {
  bottom: 80px;
}

/* Print styles */
@media print {
  .app-header,
  .toolbar,
  .sidebar,
  .selection-toolbar,
  .toast-container,
  .empty-state,
  #empty-state {
    display: none !important;
  }

  .app-main {
    display: block;
  }

  .grid-area {
    padding: 0;
    overflow: visible;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
  }

  .plate-grid {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}