/* ==========================================================================
   HYGR MATERIAL REQUIREMENT CALCULATOR & STOCK CARD SYSTEM
   Design System: Industrial Minimalism (DESIGN.md)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  /* Surface & Canvas Tokens */
  --surface: #F2F3F4;
  --surface-dim: #d9dae1;
  --surface-bright: #F2F3F4;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f2f3fa;
  --surface-container: #ededf5;
  --surface-container-high: #e7e8ef;
  --surface-container-highest: #e1e2e9;
  --background: #F2F3F4;

  /* Text / On-Surface Tokens */
  --on-surface: #191c21;
  --on-surface-variant: #424751;
  --on-background: #191c21;
  --inverse-surface: #2e3036;
  --inverse-on-surface: #f0f0f8;

  /* Border & Outline Tokens */
  --outline: #727783;
  --outline-variant: #c2c6d3;
  --surface-tint: #175ead;

  /* Primary Brand (Bauhaus Blue) */
  --primary: #003e7a;
  --on-primary: #ffffff;
  --primary-container: #0055a4;
  --on-primary-container: #afccff;
  --inverse-primary: #a8c8ff;

  /* Secondary */
  --secondary: #515f74;
  --on-secondary: #ffffff;
  --secondary-container: #d5e3fd;
  --on-secondary-container: #57657b;

  /* Semantic Palettes */
  --error: #ba1a1a;
  --on-error: #ffffff;
  --error-container: #ffdad6;
  --on-error-container: #93000a;

  --success: #146c2e;
  --on-success: #ffffff;
  --success-container: #d1e7dd;
  --on-success-container: #0f5132;

  --warning: #856404;
  --on-warning: #ffffff;
  --warning-container: #fff3cd;
  --on-warning-container: #664d03;

  --info-container: #e0f2fe;
  --on-info-container: #0369a1;

  /* Radius & Spacing */
  --radius-sm: 2px;
  --radius-default: 4px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
}

/* ==========================================================================
   RESET & BASE TYPOGRAPHY
   ========================================================================== */

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background);
  color: var(--on-surface);
  line-height: 1.5;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography Classes per DESIGN.md */
.display-lg {
  font-family: 'Inter', sans-serif;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.headline-md {
  font-family: 'Inter', sans-serif;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.title-sm {
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
}

.body-md {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 400;
}

.data-tabular {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0em;
}

.label-caps {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1;
}

/* ==========================================================================
   LAYOUT ARCHITECTURE (12-Col Desktop Max 1440px)
   ========================================================================== */

.app-wrapper {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg) var(--spacing-xl);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* System Header Bar */
.system-header {
  border-bottom: 1px solid var(--outline-variant);
  background-color: var(--surface);
  padding: var(--spacing-md) 0;
  margin-bottom: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.brand-logo-badge {
  background-color: var(--primary);
  color: var(--on-primary);
  padding: 6px 10px;
  border-radius: var(--radius-default);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.brand-title {
  font-family: 'Inter', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--on-surface);
}

.brand-subtitle {
  font-size: 12px;
  color: var(--on-surface-variant);
}

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

/* Main Split View Grid (25% Left / 75% Right) */
.split-view-container {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--spacing-lg);
  align-items: start;
  flex: 1;
}

@media (max-width: 1024px) {
  .split-view-container {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   ELEVATION LEVEL 1: CARDS & WORK PANES
   ========================================================================== */

.card-level-1 {
  background-color: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-default);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--outline-variant);
}

.card-title {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--on-surface);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* Left Sidebar Navigation & Planning Controls */
.left-pane {
  display: flex;
  flex-direction: column;
}

.nav-tabs-menu {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: var(--spacing-md);
}

.nav-tab-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background-color: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-default);
  color: var(--on-surface-variant);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.nav-tab-btn:hover {
  background-color: var(--surface-container-high);
  color: var(--on-surface);
}

.nav-tab-btn.active {
  background-color: var(--surface-container-highest);
  border-left: 3px solid var(--primary);
  border-color: var(--outline-variant);
  color: var(--primary);
  font-weight: 600;
}

/* ==========================================================================
   INPUT FIELDS, SELECTS & CONTROLS
   ========================================================================== */

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--on-surface-variant);
  margin-bottom: var(--spacing-xs);
}

.input-field, .select-field {
  width: 100%;
  padding: 8px 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--on-surface);
  background-color: var(--surface-container-lowest);
  border: 1px solid var(--outline);
  border-radius: var(--radius-default);
  outline: none;
  transition: border-color 0.15s ease;
}

.input-field:focus, .select-field:focus {
  border-color: var(--primary);
  box-shadow: inset 0 0 0 1px var(--primary);
}

.input-field::placeholder {
  color: var(--outline);
  font-family: 'Inter', sans-serif;
}

/* Button Component Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-default);
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

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

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

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

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

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

.btn-danger {
  background-color: var(--error);
  color: var(--on-error);
  border: 1px solid var(--error);
}

.btn-danger:hover {
  background-color: var(--on-error-container);
}

/* ==========================================================================
   STATUS CHIPS & BADGES
   ========================================================================== */

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1.2;
}

.chip-success {
  background-color: var(--success-container);
  color: var(--on-success-container);
}

.chip-error {
  background-color: var(--error-container);
  color: var(--on-error-container);
}

.chip-warning {
  background-color: var(--warning-container);
  color: var(--on-warning-container);
}

.chip-info {
  background-color: var(--secondary-container);
  color: var(--on-secondary-container);
}

.badge-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background-color: var(--surface-container-high);
  color: var(--on-surface-variant);
}

/* ==========================================================================
   DATA TABLES (High Density, 1px Borders, Zebra Striping)
   ========================================================================== */

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-default);
  background-color: var(--surface-container-lowest);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th {
  background-color: var(--surface-container-lowest);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--on-surface-variant);
  padding: 8px 12px;
  border-bottom: 2px solid var(--on-surface);
  white-space: nowrap;
}

.data-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--outline-variant);
  font-size: 13px;
  color: var(--on-surface);
  vertical-align: middle;
}

.data-table tbody tr:nth-child(even) {
  background-color: var(--surface-container-low);
}

.data-table tbody tr:hover {
  background-color: var(--surface-container);
}

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

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

/* Table Footer / Summary Rule */
.table-summary-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--surface-container-high);
  border-top: 1px solid var(--outline-variant);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 600;
}

/* ==========================================================================
   KPI SUMMARY CARDS & HERO METRICS
   ========================================================================== */

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.kpi-card {
  background-color: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-default);
  padding: var(--spacing-sm) var(--spacing-md);
}

.kpi-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--on-surface-variant);
  margin-bottom: 4px;
}

.kpi-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 20px;
  font-weight: 700;
  color: var(--on-surface);
}

.kpi-subtext {
  font-size: 11px;
  color: var(--on-surface-variant);
}

/* ==========================================================================
   ELEVATION LEVEL 2: MODALS / DIALOGS (1px on-surface, 8px backdrop blur)
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(25, 28, 33, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background-color: var(--surface-container-lowest);
  border: 1px solid var(--on-surface);
  border-radius: var(--radius-default);
  width: 100%;
  max-width: 580px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: none; /* Dieter Rams: No fake heavy shadows */
}

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

.modal-title {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 600;
  color: var(--on-surface);
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 20px;
  line-height: 1;
  color: var(--outline);
  cursor: pointer;
  padding: 4px;
}

.modal-close-btn:hover {
  color: var(--on-surface);
}

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

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border-top: 1px solid var(--outline-variant);
  background-color: var(--surface-container-low);
}

/* ==========================================================================
   TOAST / SNACKBAR NOTIFICATIONS
   ========================================================================== */

.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: 2000;
}

.toast {
  background-color: var(--inverse-surface);
  color: var(--inverse-on-surface);
  padding: 10px 16px;
  border-radius: var(--radius-default);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  animation: slideIn 0.2s ease-out;
}

.toast.success {
  background-color: var(--success);
  color: var(--on-success);
}

.toast.error {
  background-color: var(--error);
  color: var(--on-error);
}

@keyframes slideIn {
  from { transform: translateY(12px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Search Bar in Table Headers */
.table-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.search-input-wrapper {
  position: relative;
  flex: 1;
  max-width: 380px;
}

/* Row update flash & status banner */
@keyframes rowFlash {
  0% { background-color: #d5e3fd; }
  100% { background-color: transparent; }
}

.row-flash td {
  animation: rowFlash 1.5s ease-out;
}

.alert-banner {
  background-color: var(--surface-container-low);
  border: 1px solid var(--outline-variant);
  border-left: 4px solid var(--primary);
  padding: 10px 14px;
  border-radius: var(--radius-default);
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.alert-banner.success {
  border-left-color: var(--success);
  background-color: #f0fdf4;
}