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

/* ============================================================
   CSS Custom Properties
   ============================================================ */
:root {
  /* Brand tokens — dark mode */
  --bg-primary:        #0f0f0f;
  --bg-surface:        #1a1d22;
  --text-primary:      #f0ece4;
  --text-muted:        #8a8a8a;
  --accent-amber:      #e8a838;
  --accent-teal:       #3a8c8c;
  --color-success:     #47c78a;
  --color-warning:     #f5b759;
  --color-error:       #ef5b5b;
  --glow-amber:        0 0 60px rgba(232, 168, 56, 0.15);
  --transition:        0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --radius:            12px;
  --font-body:         'DM Sans', system-ui, sans-serif;
  --font-mono:         'JetBrains Mono', 'Courier New', monospace;

  /* App-specific extensions */
  --bg-app:                  #0d1117;
  --spectrum-occupied:       rgba(239, 91, 91, 0.75);
  --spectrum-5g:             rgba(239, 91, 91, 0.9);
  --spectrum-whitespace:     rgba(71, 199, 138, 0.08);
  --spectrum-protected:      rgba(245, 183, 89, 0.5);
  --spectrum-intermod:       rgba(232, 168, 56, 0.3);
  --spectrum-intermod-stroke:rgba(232, 168, 56, 0.6);
  --spectrum-cellular:       rgba(180, 100, 255, 0.28);
  --spectrum-cellular-stroke:rgba(180, 100, 255, 0.65);
  --spectrum-band-overlay:   rgba(71, 199, 138, 0.22);
  --spectrum-window-fill:    rgba(71, 199, 138, 0.08);
  --spectrum-ch-label:       rgba(240, 236, 228, 0.45);
  --spectrum-ch-border:      rgba(240, 236, 228, 0.6);
  --spectrum-ruler-tick:     rgba(240, 236, 228, 0.25);
  --spectrum-ruler-text:     rgba(240, 236, 228, 0.5);
  --spectrum-ruler-base:     rgba(240, 236, 228, 0.12);
  --scan-trace:              #4dd9ac;
  --border-surface:          1px solid rgba(240, 236, 228, 0.07);
  --space-1: 4px;  --space-2: 8px;  --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 64px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

a {
  color: var(--accent-amber);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--accent-amber);
  outline-offset: 3px;
  border-radius: 3px;
}

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  background: none;
}

button:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent-amber);
  outline-offset: 2px;
  border-radius: 4px;
}

select {
  font-family: var(--font-body);
}

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

.app__main {
  flex: 1;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-4);
}

.app__section {
  margin-bottom: var(--space-6);
}

/* ============================================================
   Header
   ============================================================ */
.header {
  background: var(--bg-surface);
  border-bottom: var(--border-surface);
  padding: var(--space-4) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.header__brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.header__title {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.header__subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.header__actions {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent-amber);
  color: #0d1117;
}

.btn--primary:hover {
  background: #f0b840;
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border: var(--border-surface);
}

.btn--ghost:hover {
  background: rgba(240, 236, 228, 0.05);
}

.btn--small {
  padding: var(--space-1) var(--space-3);
  font-size: 0.8rem;
}

/* ============================================================
   Region Selector
   ============================================================ */
.region-selector {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.region-selector__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.region-selector__tabs {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.region-selector__tab {
  padding: var(--space-2) var(--space-5);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid transparent;
  transition: var(--transition);
}

.region-selector__tab:hover {
  color: var(--text-primary);
  border-color: rgba(240, 236, 228, 0.15);
}

.region-selector__tab--active {
  color: var(--bg-app);
  background: var(--accent-amber);
  border-color: var(--accent-amber);
}

.region-selector__tab--active:hover {
  background: #f0b840;
}

/* ============================================================
   Frequency Spectrum
   ============================================================ */
.spectrum {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.spectrum__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.spectrum__sticky-wrap {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg-app);
  padding-top: var(--space-3);
  padding-bottom: var(--space-2);
  margin-bottom: 0;
}

.spectrum__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.spectrum__header .section-title {
  margin-bottom: 0;
}

.spectrum__zoom-controls {
  display: flex;
  gap: var(--space-1);
}

.spectrum__zoom-btn {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid rgba(240, 236, 228, 0.15);
  background: var(--bg-surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.spectrum__zoom-btn:hover {
  color: var(--text-primary);
  border-color: rgba(240, 236, 228, 0.3);
}

.spectrum__zoom-btn--active {
  background: rgba(232, 168, 56, 0.15);
  border-color: var(--accent-amber);
  color: var(--accent-amber);
}

.spectrum__container {
  position: relative;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
  background: var(--bg-surface);
  border: var(--border-surface);
  cursor: grab;
}

.spectrum__container:active {
  cursor: grabbing;
}

.spectrum__scroll-hint-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-muted);
  opacity: 0.5;
  letter-spacing: 0.1em;
  margin-left: 0.5rem;
  text-transform: none;
}

.spectrum__svg {
  display: block;
  /* Width controlled by SVG width attribute — do not override */
}

.spectrum__legend {
  display: flex;
  gap: var(--space-5);
  flex-wrap: wrap;
  padding: var(--space-2) 0;
}

.spectrum__legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.spectrum__legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

.spectrum__legend-swatch--occupied  { background: var(--color-error); }
.spectrum__legend-swatch--intermod  { background: var(--accent-amber); }
.spectrum__legend-swatch--cellular  { background: rgba(180, 100, 255, 0.85); }
.spectrum__legend-swatch--safe      { background: var(--color-success); }
.spectrum__legend-swatch--band      { background: var(--color-success); border: 2px solid var(--color-success); }

.spectrum__tooltip {
  position: absolute;
  top: 4px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(26, 29, 34, 0.97);
  border: 1px solid rgba(240, 236, 228, 0.2);
  border-radius: 6px;
  padding: var(--space-2) var(--space-3);
  font-size: 0.8rem;
  pointer-events: none;
  white-space: nowrap;
  z-index: 10;
  opacity: 0;
  transition: opacity 0.15s ease;
  max-width: 260px;
}

.spectrum__tooltip--visible {
  opacity: 1;
}

.spectrum__tooltip-channel {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-amber);
}

.spectrum__tooltip-freq {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-primary);
}

.spectrum__tooltip-status {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.spectrum__tooltip-hint {
  font-size: 0.65rem;
  color: rgba(240, 236, 228, 0.3);
  margin-top: 3px;
  font-style: italic;
}

.spectrum__tooltip-pin {
  font-size: 0.7rem;
  margin-left: 4px;
}

/* ============================================================
   Manufacturer Selector
   ============================================================ */
.mfr-selector {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.mfr-selector__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.mfr-selector__controls {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: flex-end;
}

.mfr-selector__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mfr-selector__field-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.mfr-selector__select {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid rgba(240, 236, 228, 0.12);
  border-radius: 6px;
  padding: var(--space-2) var(--space-3);
  font-size: 0.875rem;
  min-width: 180px;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238a8a8a' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
  transition: var(--transition);
  cursor: pointer;
}

.mfr-selector__select:hover {
  border-color: rgba(240, 236, 228, 0.25);
}

.mfr-selector__select:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.mfr-selector__clear {
  align-self: flex-end;
}

.mfr-selector__dpa-note {
  background: rgba(58, 140, 140, 0.1);
  border: 1px solid rgba(58, 140, 140, 0.3);
  border-radius: 6px;
  padding: var(--space-3) var(--space-4);
  font-size: 0.8rem;
  color: var(--accent-teal);
  max-width: 480px;
}

/* ============================================================
   Band Reference Panel
   ============================================================ */
.band-ref {
  margin-top: var(--space-4);
  background: var(--bg-app);
  border: var(--border-surface);
  border-radius: var(--radius);
  padding: var(--space-4);
  overflow: hidden;
}

.band-ref__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-3);
  gap: var(--space-3);
  flex-wrap: wrap;
}

.band-ref__title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.band-ref__scale-label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: rgba(240, 236, 228, 0.3);
  /* matches the track column width — set explicitly via grid */
  flex: 1;
  max-width: 260px;
  min-width: 100px;
}

.band-ref__list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.band-ref__list-header {
  display: grid;
  grid-template-columns: 52px 120px 1fr;
  gap: 0 var(--space-3);
  padding-bottom: var(--space-2);
  margin-bottom: 2px;
  border-bottom: 1px solid rgba(240, 236, 228, 0.08);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(240, 236, 228, 0.25);
}

/* Series header hidden — series label shown below each row */
.band-ref__list-header span:last-child { display: none; }

.band-ref__row {
  display: grid;
  /* Row 1: band | range | track */
  /* Row 2: (empty) | series spanning cols 2-3 */
  grid-template-columns: 52px 120px 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 0 var(--space-3);
  padding: 4px 0 2px;
  border-bottom: 1px solid rgba(240, 236, 228, 0.04);
}

.band-ref__row--dim {
  opacity: 0.38;
}

.band-ref__band  { grid-row: 1; grid-column: 1; }
.band-ref__range { grid-row: 1; grid-column: 2; }
.band-ref__track { grid-row: 1; grid-column: 3; }
.band-ref__series {
  grid-row: 2;
  grid-column: 2 / -1;
  padding-bottom: 3px;
}

.band-ref__band {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-amber);
  white-space: nowrap;
}

.band-ref__range {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-primary);
  white-space: nowrap;
}

.band-ref__track {
  position: relative;
  height: 8px;
  background: rgba(240, 236, 228, 0.06);
  border-radius: 4px;
  overflow: visible;
  display: flex;
  align-items: center;
}

.band-ref__fill {
  position: absolute;
  height: 100%;
  background: var(--accent-amber);
  border-radius: 3px;
  opacity: 0.65;
}

/* Left-clipped band: add a visual indicator that it starts before 470 MHz */
.band-ref__fill--clips-left {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  border-left: 2px dashed rgba(232, 168, 56, 0.5);
}

.band-ref__out-badge {
  font-size: 0.65rem;
  color: rgba(240, 236, 228, 0.3);
  font-style: italic;
  white-space: nowrap;
}

.band-ref__series {
  grid-column: 2 / -1;
  font-size: 0.65rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding-bottom: 4px;
}

/* ============================================================
   Coordination Windows
   ============================================================ */
.coord-windows {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.coord-windows__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-3);
}

.coord-windows__header-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.coord-windows__title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.coord-windows__count {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-success);
}

.coord-windows__empty {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-style: italic;
}

.coord-windows__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-3);
}

.coord-window-card {
  background: var(--bg-surface);
  border: var(--border-surface);
  border-left: 3px solid var(--color-success);
  border-radius: var(--radius);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: var(--transition);
}

.coord-window-card:hover {
  border-left-color: var(--accent-amber);
  transform: translateY(-2px);
}

.coord-window-card--outside {
  border-left-color: var(--text-muted);
  opacity: 0.5;
}

.coord-window-card__range {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.coord-window-card__width {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-success);
}

.coord-window-card__badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(71, 199, 138, 0.15);
  color: var(--color-success);
  align-self: flex-start;
}

.coord-window-card__badge--outside {
  background: rgba(138, 138, 138, 0.15);
  color: var(--text-muted);
}

.coord-window-card__note {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.coord-window-card--highlighted {
  border-left-color: var(--color-success);
  background: rgba(71, 199, 138, 0.05);
  box-shadow: 0 0 0 1px rgba(71, 199, 138, 0.25);
}

.coord-window-card {
  cursor: pointer;
}

.coord-window-card__counts {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.coord-window-card__ch-count {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
}

.coord-window-card__suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 2px;
}

.coord-window-card__freq-chip {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 1px 5px;
  background: rgba(71, 199, 138, 0.1);
  border: 1px solid rgba(71, 199, 138, 0.25);
  border-radius: 3px;
  color: var(--color-success);
}

/* Controls bar */
.coord-windows__controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: flex-end;
  margin-bottom: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-surface);
  border: var(--border-surface);
  border-radius: var(--radius);
}

.coord-windows__control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.coord-windows__control-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.coord-windows__sort-tabs {
  display: flex;
  gap: 2px;
}

.coord-windows__sort-btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid rgba(240, 236, 228, 0.12);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.coord-windows__sort-btn:hover {
  color: var(--text-primary);
  border-color: rgba(240, 236, 228, 0.25);
}

.coord-windows__sort-btn--active {
  background: rgba(232, 168, 56, 0.12);
  border-color: var(--accent-amber);
  color: var(--accent-amber);
}

.coord-windows__min-input {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  width: 70px;
  padding: 4px 8px;
  background: var(--bg-app);
  border: 1px solid rgba(240, 236, 228, 0.12);
  border-radius: 4px;
  color: var(--text-primary);
  outline: none;
  transition: var(--transition);
}

.coord-windows__min-input:focus {
  border-color: var(--accent-amber);
}

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

/* ============================================================
   Print View
   ============================================================ */
.print-view {
  display: none;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--bg-surface);
  border-top: var(--border-surface);
  padding: var(--space-4);
  text-align: center;
}

.footer__text {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer__link {
  color: var(--accent-amber);
}

/* ============================================================
   Utility Classes
   ============================================================ */
.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;
}

.mono {
  font-family: var(--font-mono);
}

.screen-only {
  /* hidden in print via @media print */
}

.section-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

/* ============================================================
   Responsive — Tablet
   ============================================================ */
@media (min-width: 768px) {
  .app__main {
    padding: var(--space-5) var(--space-6);
  }

  .header {
    padding: var(--space-4) var(--space-6);
  }

  .coord-windows__grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
}

/* ============================================================
   Responsive — Desktop
   ============================================================ */
@media (min-width: 1280px) {
  .app__main {
    padding: var(--space-6) var(--space-7);
  }

  .coord-windows__grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  }
}

/* ============================================================
   Print
   ============================================================ */
@media print {
  @page {
    size: A4;
    margin: 15mm;
  }

  .screen-only {
    display: none !important;
  }

  .print-view {
    display: block !important;
  }

  body {
    background: white;
    color: black;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 11pt;
  }

  .print-view__header {
    border-bottom: 2px solid black;
    padding-bottom: 8pt;
    margin-bottom: 16pt;
  }

  .print-view__title {
    font-size: 16pt;
    font-weight: bold;
    margin-bottom: 4pt;
  }

  .print-view__meta {
    font-size: 9pt;
    color: #555;
  }

  .print-view__table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12pt;
    font-size: 10pt;
  }

  .print-view__table th,
  .print-view__table td {
    border: 1px solid black;
    padding: 4pt 8pt;
    text-align: left;
  }

  .print-view__table th {
    background: #f0f0f0;
    font-weight: bold;
  }

  .print-view__table tr:nth-child(even) td {
    background: #fafafa;
  }

  .print-view__band-info {
    margin-top: 12pt;
    padding: 8pt;
    border: 1px solid black;
    font-size: 9pt;
  }

  .print-view__footer {
    margin-top: 20pt;
    border-top: 1px solid black;
    padding-top: 8pt;
    font-size: 8pt;
    color: #555;
    text-align: center;
  }
}

/* ============================================================
   Light Theme Overrides
   ============================================================ */
[data-theme="light"] {
  --bg-primary:        #f4f1eb;
  --bg-surface:        #ffffff;
  --bg-app:            #ede9e0;
  --text-primary:      #1a1a1a;
  --text-muted:        #6b6560;
  --accent-amber:      #b07820;
  --accent-teal:       #2a6a6a;
  --color-success:     #1f8a56;
  --color-warning:     #b07820;
  --color-error:       #c0392b;
  --glow-amber:        0 0 40px rgba(176, 120, 32, 0.1);
  --spectrum-occupied:       rgba(192, 57, 43, 0.65);
  --spectrum-5g:             rgba(192, 57, 43, 0.85);
  --spectrum-whitespace:     rgba(31, 138, 86, 0.1);
  --spectrum-protected:      rgba(176, 120, 32, 0.4);
  --spectrum-intermod:       rgba(176, 120, 32, 0.25);
  --spectrum-intermod-stroke:rgba(176, 120, 32, 0.55);
  --spectrum-cellular:       rgba(130, 70, 210, 0.2);
  --spectrum-cellular-stroke:rgba(130, 70, 210, 0.5);
  --spectrum-band-overlay:   rgba(31, 138, 86, 0.2);
  --spectrum-window-fill:    rgba(31, 138, 86, 0.07);
  --spectrum-ch-label:       rgba(26, 26, 26, 0.4);
  --spectrum-ch-border:      rgba(26, 26, 26, 0.55);
  --spectrum-ruler-tick:     rgba(26, 26, 26, 0.2);
  --spectrum-ruler-text:     rgba(26, 26, 26, 0.5);
  --spectrum-ruler-base:     rgba(26, 26, 26, 0.1);
  --scan-trace:              #0d9e72;
  --border-surface:          1px solid rgba(26, 26, 26, 0.1);
}

/* ============================================================
   Pinned Bands
   ============================================================ */
.pinned-bands {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--border-surface);
}

.pinned-bands__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.pinned-bands__label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.pinned-bands__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.pinned-bands__chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface);
  border: var(--border-surface);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.72rem;
}

.pinned-bands__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.pinned-bands__name {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 600;
}

.pinned-bands__range {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
}

.pinned-bands__remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
  padding: 0 2px;
  transition: color var(--transition);
}

.pinned-bands__remove:hover {
  color: var(--color-error);
}

/* ============================================================
   Regulatory Panel
   ============================================================ */
.reg-panel {
  margin-top: var(--space-5);
  background: var(--bg-app);
  border: var(--border-surface);
  border-radius: var(--radius);
  padding: var(--space-4);
}

.reg-panel__band-context {
  text-transform: none;
  letter-spacing: 0;
  color: var(--accent-amber);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.reg-panel__intro {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
  font-style: italic;
}

.reg-panel__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.reg-panel__table th {
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid rgba(240, 236, 228, 0.1);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(240, 236, 228, 0.35);
  white-space: nowrap;
}

.reg-panel__table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid rgba(240, 236, 228, 0.04);
  vertical-align: top;
}

.reg-panel__table tr:last-child td {
  border-bottom: none;
}

.reg-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  margin-bottom: 0;
}

.reg-panel__header:focus-visible {
  outline: 2px solid var(--accent-amber);
  outline-offset: 2px;
  border-radius: 4px;
}

.reg-panel__toggle {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: var(--space-2);
}

.reg-panel__authority-link {
  color: var(--accent-amber);
  text-decoration: none;
  transition: opacity var(--transition);
}

.reg-panel__authority-link:hover {
  opacity: 0.75;
  text-decoration: underline;
}

.reg-panel__status-cell {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}

.reg-panel__apply-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-amber);
  text-decoration: none;
  border: 1px solid rgba(232, 168, 56, 0.35);
  border-radius: 3px;
  padding: 1px 5px;
  transition: background var(--transition), border-color var(--transition);
  white-space: nowrap;
}

.reg-panel__apply-link:hover {
  background: rgba(232, 168, 56, 0.12);
  border-color: var(--accent-amber);
}

.reg-panel__apply-link--inline {
  margin-left: 4px;
  vertical-align: middle;
}

.reg-panel__country {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-amber);
}

.reg-panel__country-name {
  display: block;
  font-size: 0.68rem;
  color: var(--text-muted);
}

.reg-panel__authority {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-primary);
  white-space: nowrap;
}

.reg-panel__notes {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.4;
  max-width: 320px;
}

.reg-panel__note-detail {
  color: rgba(240, 236, 228, 0.4);
}

.reg-panel__band-summary {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
}

.reg-panel__disclaimer {
  margin-top: var(--space-3);
  font-size: 0.65rem;
  color: rgba(240, 236, 228, 0.25);
  font-style: italic;
}

.reg-panel__badge {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.reg-panel__badge--required   { background: rgba(245, 183, 89, 0.15); color: #f5b759; }
.reg-panel__badge--free       { background: rgba(71, 199, 138, 0.15); color: #47c78a; }
.reg-panel__badge--prohibited { background: rgba(239, 91, 91, 0.15);  color: #ef5b5b; }
.reg-panel__badge--partial    { background: rgba(232, 168, 56, 0.15); color: #e8a838; }
.reg-panel__badge--outside    { background: rgba(138, 138, 138, 0.1); color: #888; }

@media (max-width: 600px) {
  .reg-panel__table th:last-child,
  .reg-panel__table td:last-child {
    display: none;
  }
}

/* ============================================================
   Mobile UX — narrow screens
   ============================================================ */
@media (max-width: 480px) {
  .header {
    flex-wrap: wrap;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-3);
  }

  .header__brand {
    flex: 1 1 100%;
  }

  .header__actions {
    flex: 1 1 100%;
    justify-content: flex-end;
  }

  .header__subtitle {
    font-size: 0.65rem;
  }

  .app__main {
    padding: var(--space-3);
  }

  .app__section {
    margin-bottom: var(--space-4);
  }

  /* Stacked region buttons */
  .region-selector {
    gap: var(--space-1);
    flex-wrap: wrap;
  }

  .region-btn {
    flex: 1 1 auto;
    min-width: 48px;
    text-align: center;
  }

  /* Spectrum: shrink ruler text and tooltip */
  .spectrum__tooltip {
    font-size: 0.65rem;
    padding: var(--space-2);
    max-width: 180px;
  }

  .spectrum__zoom-btn {
    font-size: 0.6rem;
    padding: 3px 6px;
  }

  /* Manufacturer selector: stack dropdowns */
  .mfr-selector__row {
    flex-direction: column;
    align-items: stretch;
  }

  .mfr-selector__row select {
    width: 100%;
  }

  /* Windows controls: stack */
  .coord-windows__controls {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  /* Reg panel: hide Authority column on very small screens */
  .reg-panel__table th:nth-child(2),
  .reg-panel__table td:nth-child(2) {
    display: none;
  }

  /* Pinned bands: wrap chips */
  .pinned-bands__list {
    gap: var(--space-1);
  }

  .pinned-bands__chip {
    font-size: 0.65rem;
  }
}

/* ============================================================
   Intermod Calculator
   ============================================================ */
.intermod-calc {
  display: flex;
  gap: var(--space-5);
  flex-wrap: wrap;
  align-items: flex-start;
}

.intermod-calc__inputs {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex-shrink: 0;
}

.intermod-calc__input-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.intermod-calc__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  width: 20px;
  flex-shrink: 0;
}

.intermod-calc__input {
  background: var(--bg-surface);
  border: var(--border-surface);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 4px 8px;
  width: 110px;
  -moz-appearance: textfield;
}

.intermod-calc__input::-webkit-outer-spin-button,
.intermod-calc__input::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

.intermod-calc__input:focus {
  outline: 2px solid var(--accent-amber);
  outline-offset: 2px;
}

.intermod-calc__unit {
  font-size: 0.65rem;
  color: var(--text-muted);
}

.intermod-calc__remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
  padding: 0 4px;
  transition: color var(--transition);
}

.intermod-calc__remove:hover { color: var(--color-error); }

.intermod-calc__actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

.intermod-calc__results {
  flex: 1;
  min-width: 200px;
}

.intermod-calc__results-header {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.intermod-calc__products {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.intermod-calc__product {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}

.intermod-calc__product-freq {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #ff5252;
  font-weight: 700;
  min-width: 90px;
}

.intermod-calc__product-expr {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
}

.intermod-calc__empty {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: italic;
}

@media (max-width: 480px) {
  .intermod-calc { flex-direction: column; }
  .intermod-calc__input { width: 100%; }
}

/* ============================================================
   Scan legend swatch
   ============================================================ */
.spectrum__legend-swatch--scan {
  background: var(--scan-trace);
  opacity: 0.85;
}

/* ============================================================
   Scan Upload widget
   ============================================================ */
.scan-upload {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px dashed rgba(240,236,228,0.2);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
  transition: border-color 0.15s, background 0.15s;
}
.scan-upload:hover,
.scan-upload--drag {
  border-color: var(--accent-amber);
  background: rgba(232,168,56,0.04);
  color: var(--text-primary);
}
.scan-upload--loaded {
  cursor: default;
  border-style: solid;
  border-color: rgba(77,217,172,0.35);
  justify-content: space-between;
}
.scan-upload__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}
.scan-upload__filename {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--scan-trace);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 280px;
}
.scan-upload__detail {
  font-size: 0.65rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.scan-upload__clear {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 3px;
  flex-shrink: 0;
}
.scan-upload__clear:hover { color: var(--text-primary); background: rgba(240,236,228,0.08); }
.scan-upload__prompt { opacity: 0.7; }