/* ==========================================================================
   PVWatts Studio - Modern, High-Performance Solar Calculator Styling
   ========================================================================== */

:root {
  /* Official UMass Lowell brand palette */
  --uml-blue: #1257D1;
  --uml-black: #000000;
  --uml-dark-blue: #00396E;
  --uml-light-blue: #5ADBFF;
  --uml-gray: #878A8F;
  --uml-bright-blue: #00B5F1;
  --uml-green: #3BD5AE;
  --uml-aqua: #62DAFC;
  --uml-yellow: #FFD140;
  --uml-orange: #FB471F;
  --uml-fern: #027669;
  --uml-river: #4295A9;
  --uml-gold: #D0AF22;
  --uml-maroon: #9E3124;

  /* Dark application surfaces derived from UML black and dark blue */
  --bg-primary: var(--uml-black);
  --bg-secondary: #001C36;
  --bg-card: rgba(0, 57, 110, 0.3);
  --bg-card-hover: rgba(18, 87, 209, 0.28);
  --bg-input: #071A2B;
  --border-color: rgba(90, 219, 255, 0.34);
  --border-subtle: rgba(90, 219, 255, 0.16);

  --text-primary: #F7FBFF;
  --text-secondary: #B8C7D5;
  --text-muted: var(--text-secondary);
  --focus-ring: var(--uml-light-blue);
  --surface-quiet: rgba(0, 28, 54, 0.62);

  /* Semantic aliases keep the primary palette dominant and accents purposeful. */
  --accent-brand: var(--uml-blue);
  --accent-brand-glow: rgba(18, 87, 209, 0.35);
  --accent-solar: var(--uml-yellow);
  --accent-solar-glow: rgba(255, 209, 64, 0.25);
  --accent-info: var(--uml-bright-blue);
  --accent-info-glow: rgba(0, 181, 241, 0.25);
  --accent-success: var(--uml-green);
  --accent-success-glow: rgba(59, 213, 174, 0.25);
  --accent-error: var(--uml-orange);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --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, 0.25);
  --shadow-glow: 0 0 20px -5px var(--accent-solar-glow);
}

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

/* Keep the browser canvas dark when momentum scrolling exposes the area
   beyond the document (for example, Safari's rubber-band overscroll). */
html {
  min-height: 100%;
  background-color: var(--bg-primary);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(circle at 50% -15%, rgba(18, 87, 209, 0.5) 0%, rgba(0, 57, 110, 0.32) 35%, var(--bg-primary) 72%);
  color: var(--text-primary);
  color-scheme: dark;
  min-height: 100vh;
  line-height: 1.5;
  caret-color: var(--accent-solar);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--accent-solar);
  color: var(--bg-primary);
}

* {
  scrollbar-color: var(--uml-dark-blue) var(--bg-primary);
  scrollbar-width: thin;
}

.skip-link {
  position: fixed;
  inset-block-start: 0.5rem;
  inset-inline-start: 0.5rem;
  z-index: 1000;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--accent-solar);
  color: var(--bg-primary);
  font-weight: 800;
  transform: translateY(-150%);
  transition: transform 0.15s ease-out;
}

.skip-link:focus {
  transform: translateY(0);
}

.skip-link:hover {
  color: var(--bg-primary);
}

/* App Container & Header */
.app-header {
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(0, 0, 0, 0.86);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.85rem 1.5rem;
}

.header-content {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--uml-blue), var(--uml-bright-blue));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px var(--accent-brand-glow);
  color: var(--text-primary);
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  white-space: nowrap;
  background: linear-gradient(to right, var(--text-primary), var(--uml-light-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-badge {
  display: inline-block;
  white-space: nowrap;
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  background: rgba(255, 209, 64, 0.12);
  color: var(--accent-solar);
  border: 1px solid rgba(255, 209, 64, 0.3);
  border-radius: 9999px;
  font-weight: 600;
}

/* Nav Tabs */
.nav-tabs {
  display: flex;
  gap: 0.5rem;
  background: rgba(0, 57, 110, 0.34);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.nav-tab-btn {
  min-height: 40px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-tab-btn:hover {
  color: var(--text-primary);
  background: rgba(90, 219, 255, 0.09);
}

.nav-tab-btn.active {
  background: var(--accent-brand);
  color: var(--text-primary);
  box-shadow: 0 0 12px var(--accent-brand-glow);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--uml-blue), var(--uml-dark-blue));
  color: var(--text-primary);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  filter: saturate(0.7);
  transform: none;
}

.btn[aria-busy="true"]:disabled {
  cursor: wait;
  opacity: 0.78;
}

.btn-primary:hover:not(:disabled) {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-outline {
  background: rgba(0, 57, 110, 0.5);
  color: var(--text-primary);
  border-color: var(--border-color);
}

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

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

/* Main Layout */
.main-container {
  max-width: 1440px;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Simulator Grid Layout */
.sim-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 1080px) {
  .sim-grid {
    grid-template-columns: 1fr;
  }
}

/* Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-md);
  transition: border-color 0.2s ease;
}

@media (hover: hover) and (pointer: fine) {
  .card:hover {
    border-color: rgba(90, 219, 255, 0.42);
  }
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
}

/* Form Controls & Sliders */
.form-group {
  margin-bottom: 1.15rem;
}

.form-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}

.form-label {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.form-value-badge {
  font-size: 0.825rem;
  font-weight: 700;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  color: var(--accent-solar);
  background: rgba(255, 209, 64, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 209, 64, 0.25);
}

.select-input, .text-input {
  width: 100%;
  min-height: 44px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.select-input:focus, .text-input:focus {
  border-color: var(--accent-brand);
  box-shadow: 0 0 0 2px var(--accent-brand-glow);
}

.location-picker {
  position: relative;
}

.location-search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.5rem;
  margin-top: 0.4rem;
}

.location-help,
.location-attribution {
  margin-top: 0.35rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  line-height: 1.45;
}

.location-help a,
.location-attribution a {
  color: var(--text-secondary);
}

.selected-location {
  display: block;
  margin-top: 0.55rem;
  padding: 0.5rem 0.65rem;
  border: 1px solid rgba(59, 213, 174, 0.4);
  border-radius: var(--radius-sm);
  background: rgba(59, 213, 174, 0.09);
  color: var(--accent-success);
  font-size: 0.8rem;
  overflow-wrap: anywhere;
}

.location-results {
  position: absolute;
  top: 4.6rem;
  left: 0;
  right: 0;
  z-index: 30;
  max-height: 260px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-lg);
}

.location-result {
  display: block;
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 0;
  border-bottom: 1px solid var(--border-subtle);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
  min-height: 44px;
  font-size: 0.825rem;
  line-height: 1.4;
}

.location-result:last-child {
  border-bottom: 0;
}

.location-result:hover,
.location-result:focus {
  outline: none;
  background: rgba(18, 87, 209, 0.2);
}

.location-result-coordinates {
  display: block;
  margin-top: 0.2rem;
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.75rem;
}

.simulation-status {
  min-height: 2.25rem;
  margin-bottom: 1rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid rgba(0, 181, 241, 0.38);
  border-radius: var(--radius-md);
  background: rgba(0, 181, 241, 0.09);
  color: var(--uml-light-blue);
  font-size: 0.875rem;
}

.simulation-status.success {
  border-color: rgba(59, 213, 174, 0.4);
  background: rgba(59, 213, 174, 0.09);
  color: var(--accent-success);
}

.simulation-status.error {
  border-color: rgba(251, 71, 31, 0.55);
  background: rgba(158, 49, 36, 0.22);
  color: var(--accent-error);
}

.results-area > :not(.simulation-status):not(.sr-only) {
  transition: opacity 0.15s ease-out;
}

.results-area.is-updating > :not(.simulation-status):not(.sr-only) {
  opacity: 0.58;
}

/* Custom Sliders */
.slider-container {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.slider-input {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 44px;
  border-radius: 9999px;
  background: transparent;
  outline: none;
  cursor: pointer;
}

.slider-input::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 9999px;
  background: var(--uml-dark-blue);
}

.slider-input::-moz-range-track {
  height: 6px;
  border-radius: 9999px;
  background: var(--uml-dark-blue);
}

.slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  margin-top: -9px;
  border-radius: 50%;
  border: 2px solid var(--bg-primary);
  background: var(--accent-solar);
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-solar-glow);
  transition: transform 0.1s ease-out;
}

.slider-input::-webkit-slider-thumb:hover {
  transform: scale(1.12);
}

.slider-input::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-solar);
  cursor: pointer;
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 10px var(--accent-solar-glow);
}

.slider-num-input {
  width: 75px;
  min-height: 44px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-weight: 600;
  text-align: right;
  outline: none;
  font-family: monospace;
}

.slider-num-input:focus {
  border-color: var(--accent-brand);
  box-shadow: 0 0 0 2px var(--accent-brand-glow);
}

/* Advanced PVWatts v8 inputs */
.advanced-settings {
  margin-top: 1.25rem;
  font-size: 0.85rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.85rem;
}

.advanced-settings summary {
  cursor: pointer;
  color: var(--text-secondary);
  font-weight: 700;
}

.advanced-settings summary:hover {
  color: var(--text-primary);
}

.advanced-help {
  margin-top: 0.65rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.advanced-fields {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.field-help {
  display: block;
  margin-top: 0.3rem;
  color: var(--text-muted);
  font-size: 0.78rem;
  line-height: 1.45;
}

.monthly-loss-fieldset {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem;
}

.monthly-loss-fieldset legend {
  padding: 0 0.3rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
}

.monthly-loss-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem 0.75rem;
  margin-top: 0.65rem;
}

.monthly-loss-grid label {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 600;
}

.monthly-loss-grid .text-input {
  min-width: 0;
  padding: 0.38rem 0.45rem;
  text-align: right;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

/* Orientation Dials / Visualizer */
.visualizer-box {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-around;
  gap: 1rem;
}

.dial-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.dial-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.compass-dial {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2px dashed var(--border-color);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
}

.compass-needle {
  width: 3px;
  height: 26px;
  background: linear-gradient(to top, var(--accent-info), var(--accent-solar));
  position: absolute;
  transform-origin: bottom center;
  bottom: 50%;
  border-radius: 2px;
  box-shadow: 0 0 6px var(--accent-solar);
  transition: transform 0.1s ease;
}

.compass-dot {
  width: 8px;
  height: 8px;
  background: var(--text-primary);
  border-radius: 50%;
  z-index: 2;
}

.roof-pitch-box {
  width: 70px;
  height: 48px;
  border-bottom: 2px solid var(--accent-info);
  position: relative;
  display: flex;
  align-items: flex-end;
}

.roof-line {
  width: 50px;
  height: 2px;
  background: var(--accent-solar);
  transform-origin: left bottom;
  position: absolute;
  left: 10px;
  bottom: 0;
  transition: transform 0.1s ease;
}

/* KPI Summary Badges */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.kpi-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.15rem;
  position: relative;
  overflow: hidden;
}

.kpi-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-solar), var(--accent-info));
}

.kpi-label {
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.kpi-value-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 0;
}

.kpi-value {
  min-width: 0;
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.kpi-unit {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.copy-output-btn {
  flex: 0 0 auto;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0.35rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: rgba(0, 181, 241, 0.08);
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.copy-output-btn:hover:not(:disabled) {
  color: var(--text-primary);
  background: rgba(0, 181, 241, 0.18);
  border-color: var(--accent-info);
  transform: translateY(-1px);
}

.copy-output-btn:focus-visible {
  outline: none;
  border-color: var(--accent-info);
  box-shadow: 0 0 0 2px var(--accent-info-glow);
}

.copy-output-btn.copied {
  color: var(--accent-success);
  background: var(--accent-success-glow);
  border-color: var(--accent-success);
}

.copy-output-icon {
  display: block;
  flex: none;
}

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

.kpi-subtext {
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--text-secondary);
  margin-top: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Charts Grid */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 900px) {
  .charts-grid {
    grid-template-columns: 1fr;
  }
}

.chart-container {
  height: 280px;
  position: relative;
  margin-top: 0.5rem;
}

.sweep-chart-container {
  height: 380px;
  min-height: 380px;
}

.sweep-loading {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1.5rem;
  border: 1px solid rgba(90, 219, 255, 0.18);
  border-radius: var(--radius-md);
  background:
    radial-gradient(circle at center, rgba(18, 87, 209, 0.3), rgba(0, 28, 54, 0.94) 62%),
    rgba(0, 28, 54, 0.92);
  backdrop-filter: blur(4px);
  text-align: center;
}

.sweep-loading[hidden] {
  display: none;
}

.sweep-spinner {
  width: 58px;
  height: 58px;
  position: relative;
  border: 2px solid rgba(90, 219, 255, 0.2);
  border-top-color: var(--accent-info);
  border-right-color: var(--accent-solar);
  border-radius: 50%;
  animation: sweep-spin 1s linear infinite;
  box-shadow: 0 0 20px var(--accent-info-glow);
}

.sweep-spinner span {
  position: absolute;
  inset: 16px;
  border-radius: 50%;
  background: var(--accent-solar);
  box-shadow: 0 0 14px var(--accent-solar-glow);
}

.sweep-loading-copy {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.sweep-loading-copy strong {
  color: var(--text-primary);
  font-size: 1rem;
}

.sweep-loading-copy span {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.sweep-progress-row {
  width: min(100%, 360px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
}

.sweep-progress-row progress {
  width: 100%;
  height: 8px;
  overflow: hidden;
  border: 0;
  border-radius: 9999px;
  background: rgba(90, 219, 255, 0.14);
  accent-color: var(--accent-success);
}

.sweep-progress-row progress::-webkit-progress-bar {
  border-radius: 9999px;
  background: rgba(90, 219, 255, 0.14);
}

.sweep-progress-row progress::-webkit-progress-value {
  border-radius: 9999px;
  background: linear-gradient(90deg, var(--accent-info), var(--accent-success));
  transition: width 0.25s ease;
}

.sweep-progress-row progress::-moz-progress-bar {
  border-radius: 9999px;
  background: linear-gradient(90deg, var(--accent-info), var(--accent-success));
}

.sweep-progress-row span {
  min-width: 5.25rem;
  color: var(--accent-success);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  text-align: right;
  white-space: nowrap;
}

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

@media (prefers-reduced-motion: reduce) {
  .sweep-spinner {
    animation: none;
    transform: rotate(45deg);
  }

  .sweep-progress-row progress::-webkit-progress-value {
    transition: none;
  }
}

/* Showcase the UML accent family in the multi-series parametric workspace. */
#parametric-tab > .card {
  position: relative;
  overflow: hidden;
}

#parametric-tab > .card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--uml-green),
    var(--uml-aqua),
    var(--uml-yellow),
    var(--uml-orange),
    var(--uml-fern),
    var(--uml-river),
    var(--uml-gold),
    var(--uml-maroon)
  );
}

/* Results Data Table */
.data-table-wrapper {
  overflow-x: auto;
  margin-top: 0.75rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: right;
}

.data-table th {
  background: rgba(0, 57, 110, 0.58);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--border-color);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.data-table th:first-child, .data-table td:first-child {
  text-align: left;
}

.data-table td {
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid rgba(90, 219, 255, 0.12);
  color: var(--text-primary);
  font-family: monospace;
}

.data-table tr:hover td {
  background: rgba(90, 219, 255, 0.05);
}

.data-table tfoot td {
  font-weight: 700;
  background: rgba(0, 57, 110, 0.42);
  border-top: 2px solid var(--border-color);
  color: var(--accent-solar);
}

/* Independent-project disclaimer */
.app-footer {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 1.5rem 1.5rem;
}

.app-footer p {
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: center;
}

.app-footer strong {
  color: var(--text-secondary);
}

.footer-github {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 0.75rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-decoration: none;
}

.footer-github:hover,
.footer-github:focus-visible {
  color: var(--text-primary);
  text-decoration: underline;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: slideIn 0.2s ease-out;
}

.toast.error {
  border-color: rgba(251, 71, 31, 0.7);
  background: rgba(158, 49, 36, 0.72);
}

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

/* Interaction, onboarding, and responsive refinement */
[hidden] {
  display: none !important;
}

:where(button, a, input, select, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

:where(.text-input, .select-input, .slider-num-input):focus-visible {
  outline: 0;
  border-color: var(--focus-ring);
  box-shadow: 0 0 0 3px rgba(90, 219, 255, 0.28);
}

:where(.text-input, .select-input, .slider-num-input)[aria-invalid="true"] {
  border-color: var(--accent-error);
  box-shadow: 0 0 0 3px rgba(251, 71, 31, 0.2);
}

.slider-input:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 0;
}

a {
  color: var(--uml-light-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--text-primary);
}

button svg,
.form-label svg {
  flex: 0 0 auto;
}

.nav-label-compact,
.export-label-compact {
  display: none;
}

.auto-update-note {
  max-width: 48ch;
  margin: -0.15rem 0 1.1rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
}

.parameter-group {
  min-width: 0;
  margin: 0;
  padding: 1rem 0 0;
  border: 0;
  border-top: 1px solid var(--border-subtle);
}

.parameter-group + .parameter-group,
.mobile-estimate-bridge + .parameter-group {
  margin-top: 1.25rem;
}

.parameter-group legend {
  padding-inline-end: 0.65rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 750;
}

.parameter-group .form-group:last-child,
.quick-choice-grid .form-group {
  margin-bottom: 0;
}

.quick-choice-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
}

.system-tuning-group {
  padding-bottom: 0.2rem;
}

.advanced-settings,
.api-access-settings {
  margin-top: 1.25rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.875rem;
}

.advanced-settings summary,
.api-access-settings summary,
.sweep-data-panel summary {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-weight: 700;
  cursor: pointer;
}

.advanced-settings summary:hover,
.api-access-settings summary:hover,
.sweep-data-panel summary:hover {
  color: var(--text-primary);
}

.api-access-settings summary span,
.request-count {
  display: inline-flex;
  align-items: center;
  min-height: 1.65rem;
  padding: 0.15rem 0.55rem;
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  background: rgba(0, 181, 241, 0.08);
  color: var(--uml-light-blue);
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

.api-access-content {
  padding-top: 0.55rem;
}

.api-access-content .field-help {
  max-width: 44ch;
}

.dial-value {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.8rem;
  font-weight: 700;
}

.dial-value-solar {
  color: var(--accent-solar);
}

.dial-value-info {
  color: var(--uml-light-blue);
}

.location-badge-label {
  max-width: 52ch;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: right;
  overflow-wrap: anywhere;
}

.mobile-estimate-bridge {
  display: none;
}

.chart-fallback,
.chart-empty {
  height: 100%;
  min-height: 12rem;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  background: var(--surface-quiet);
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  text-align: center;
}

.parametric-card {
  margin-bottom: 1.5rem;
}

.parametric-intro {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.section-intro {
  max-width: 68ch;
  margin-top: 0.35rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.sweep-setup-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(18rem, 0.85fr);
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.sweep-assumptions,
.sweep-run-panel {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--surface-quiet);
}

.sweep-assumptions h3,
.sweep-run-panel h3 {
  margin-bottom: 0.65rem;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.sweep-assumptions dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem 1rem;
}

.sweep-assumptions dl div {
  min-width: 0;
}

.sweep-assumptions dt {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sweep-assumptions dd {
  margin: 0.15rem 0 0;
  color: var(--text-primary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.825rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.sweep-assumptions p,
.sweep-run-panel > p {
  margin-top: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  line-height: 1.5;
}

.quota-check {
  display: grid;
  grid-template-columns: 1.25rem minmax(0, 1fr);
  align-items: start;
  gap: 0.65rem;
  margin-top: 0.85rem;
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
}

.quota-check input {
  width: 1.2rem;
  height: 1.2rem;
  margin-top: 0.1rem;
  accent-color: var(--accent-brand);
}

.sweep-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.9rem;
}

.sweep-run-panel #sweep-guard-help {
  margin-top: 0.55rem;
}

.sweep-data-panel {
  margin-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

.sweep-data-table {
  min-width: 780px;
  font-variant-numeric: tabular-nums;
}

.sweep-data-table caption {
  padding: 0.5rem 0 0.85rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-align: left;
}

.data-table tbody th,
.data-table tfoot th {
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid rgba(90, 219, 255, 0.12);
  background: transparent;
  color: var(--text-primary);
  font-size: 0.8rem;
  text-align: left;
  text-transform: none;
  letter-spacing: normal;
}

.data-table tfoot th,
.data-table tfoot td {
  font-weight: 700;
  background: rgba(0, 57, 110, 0.42);
  border-top: 2px solid var(--border-color);
  color: var(--accent-solar);
}

.toast {
  max-width: min(28rem, calc(100vw - 2rem));
  line-height: 1.45;
  overflow-wrap: anywhere;
}

@media (max-width: 1080px) {
  .mobile-estimate-bridge {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.75rem 1rem;
    margin-top: 1.25rem;
    padding: 0.9rem 1rem;
    border: 1px solid rgba(255, 209, 64, 0.38);
    border-radius: var(--radius-md);
    background: rgba(255, 209, 64, 0.07);
  }

  .mobile-estimate-bridge h3 {
    color: var(--text-primary);
    font-size: 0.9rem;
  }

  .mobile-estimate-bridge p {
    margin-top: 0.15rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
  }

  .mobile-estimate-value {
    color: var(--accent-solar);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: clamp(1.1rem, 4vw, 1.5rem);
    font-weight: 800;
    white-space: nowrap;
  }

  .mobile-estimate-value span {
    font-size: 0.75rem;
  }

  .mobile-estimate-bridge a {
    grid-column: 1 / -1;
    justify-self: start;
    font-size: 0.8rem;
    font-weight: 700;
  }

  .quick-choice-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sweep-setup-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .app-header {
    padding: 0.6rem max(0.75rem, env(safe-area-inset-right)) 0.65rem max(0.75rem, env(safe-area-inset-left));
  }

  .header-content {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.6rem 0.75rem;
  }

  .logo-area {
    min-width: 0;
    gap: 0.55rem;
  }

  .logo-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
  }

  .logo-title {
    display: block;
    overflow: hidden;
    font-size: 1.05rem;
    text-overflow: ellipsis;
  }

  .logo-badge {
    display: none;
  }

  .header-actions {
    grid-column: 2;
    grid-row: 1;
    gap: 0.4rem;
  }

  .header-actions .btn {
    min-width: 44px;
    min-height: 44px;
    padding: 0.35rem 0.55rem;
  }

  .nav-tabs {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    gap: 0.25rem;
  }

  .nav-tab-btn {
    flex: 1 1 50%;
    justify-content: center;
    min-width: 0;
    min-height: 44px;
    padding: 0.45rem 0.65rem;
  }

  .nav-label-wide,
  .export-label-wide {
    display: none;
  }

  .nav-label-compact,
  .export-label-compact {
    display: inline;
  }

  .main-container {
    margin: 0.85rem auto 1.25rem;
    padding-right: max(0.75rem, env(safe-area-inset-right));
    padding-left: max(0.75rem, env(safe-area-inset-left));
  }

  .sim-grid,
  .charts-grid {
    gap: 1rem;
  }

  .card {
    padding: 1rem;
    border-radius: calc(var(--radius-lg) - 2px);
  }

  .card-header {
    align-items: flex-start;
    gap: 0.75rem;
  }

  .results-table-header {
    flex-direction: column;
  }

  .select-input,
  .text-input,
  .slider-num-input {
    font-size: 1rem;
  }

  .quick-choice-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .results-area {
    min-width: 0;
  }

  .kpi-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
    margin-bottom: 1rem;
  }

  .kpi-card {
    min-width: 0;
    padding: 1rem;
  }

  .kpi-value-row {
    align-items: flex-start;
    justify-content: space-between;
  }

  .kpi-value {
    font-size: clamp(1.35rem, 7vw, 1.75rem);
    overflow-wrap: anywhere;
  }

  .kpi-unit {
    display: block;
    margin: 0.2rem 0 0;
    font-size: 0.75rem;
  }

  .chart-container {
    height: 250px;
  }

  .sweep-chart-container {
    height: 360px;
    min-height: 360px;
  }

  .data-table {
    min-width: 760px;
  }

  .location-badge-label {
    text-align: left;
  }

  .parametric-intro {
    align-items: flex-start;
  }

  .sweep-assumptions dl {
    grid-template-columns: minmax(0, 1fr);
  }

  .app-footer {
    padding: 0 max(0.75rem, env(safe-area-inset-right)) max(1.25rem, env(safe-area-inset-bottom)) max(0.75rem, env(safe-area-inset-left));
  }

  .toast-container {
    right: max(0.75rem, env(safe-area-inset-right));
    bottom: max(0.75rem, env(safe-area-inset-bottom));
    left: max(0.75rem, env(safe-area-inset-left));
  }

  .toast {
    width: 100%;
    max-width: none;
  }
}

@media (max-width: 460px) {
  .logo-title {
    font-size: 0.95rem;
  }

  .parametric-intro,
  .mobile-estimate-bridge {
    grid-template-columns: minmax(0, 1fr);
  }

  .parametric-intro {
    display: grid;
  }

  .request-count {
    justify-self: start;
  }

  .mobile-estimate-value {
    justify-self: start;
  }

  .kpi-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .visualizer-box {
    gap: 0.5rem;
  }

  .sweep-actions .btn {
    width: 100%;
  }
}

@media (pointer: coarse) {
  .btn,
  .nav-tab-btn,
  .copy-output-btn,
  .advanced-settings summary,
  .api-access-settings summary,
  .sweep-data-panel summary,
  .location-result {
    min-height: 44px;
  }
}

@media (forced-colors: active) {
  .btn,
  .nav-tab-btn,
  .card,
  .kpi-card,
  .simulation-status,
  .selected-location,
  .sweep-assumptions,
  .sweep-run-panel {
    border: 1px solid CanvasText;
  }

  .nav-tab-btn.active,
  .copy-output-btn.copied {
    outline: 2px solid Highlight;
  }
}

@media (prefers-reduced-motion: reduce) {
  .skip-link,
  .btn,
  .nav-tab-btn,
  .card,
  .copy-output-btn,
  .slider-input::-webkit-slider-thumb,
  .compass-needle,
  .roof-line,
  .toast,
  .results-area > :not(.simulation-status):not(.sr-only) {
    animation: none;
    transition: none;
  }
}