/* Radio-Theory.com - Dark Theme Redesign
 * Mobile-first, responsive design for amateur radio enthusiasts
 * ©Copyright 2021-2026 Allen Tiethoff
 */

:root {
  --background: #131313;
  --surface: #1f1f1f;
  --surface-hover: #2a3141;
  --border: #343d50;
  --text-secondary: #d6dae4;
  --text-primary: #c1c8d7;
  --text-heading: #e3e6ed;
  --text-emphasis: #ffffff;
  --primary: #2a84d2;
  --primary-dark: #0f80d5;
  --primary-light: #509bdc;
  --accent: #ecb90f;
  --success: #2cc55d;
  --error: #f71118;
  --secondary: #0a0a0a;
  --shadow: rgba(0, 0, 0, 0.3);

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Courier New', monospace;

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

body.nav-open {
  overflow: hidden;
}

.skip-link {
  position: absolute;
  left: var(--space-md);
  top: 0;
  z-index: 1000;
  transform: translateY(-120%);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  background: var(--accent);
  color: #0a0a0a;
  font-weight: 700;
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(var(--space-sm));
  color: #0a0a0a;
  text-decoration: none;
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-heading);
  margin-bottom: var(--space-md);
}

h1 { font-size: clamp(1.5rem, 4vw, 2.25rem); }
h2 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h3 { font-size: clamp(1.125rem, 2.5vw, 1.5rem); }

p, ul, ol, table {
  margin-bottom: var(--space-md);
}

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

code,
pre {
  font-family: var(--font-mono);
}

a:hover {
  color: var(--text-emphasis);
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid rgba(42, 132, 210, 0.75);
  outline-offset: 2px;
}

strong {
  color: var(--text-emphasis);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(0.5rem, 2.5vw, var(--space-md));
  min-width: 0;
}

.header {
  background: rgba(19, 19, 19, 0.95);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 3px var(--shadow);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-heading);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo:hover {
  text-decoration: none;
  color: var(--text-emphasis);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-emphasis);
  font-size: 1.1rem;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  z-index: 101;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-heading);
  transition: var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.nav-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: min(280px, 80vw);
  height: 100vh;
  background: var(--surface);
  padding: 5rem var(--space-lg) var(--space-lg);
  transition: right var(--transition-normal);
  box-shadow: -2px 0 16px var(--shadow);
  border-left: 1px solid var(--border);
  z-index: 100;
}

.nav-menu.active {
  right: 0;
}

.nav-menu ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.nav-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 500;
  color: var(--text-primary);
  min-height: 44px;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--surface-hover);
  color: var(--text-emphasis);
  text-decoration: none;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
  z-index: 99;
}

.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

@media (min-width: 768px) {
  .header-content {
    padding: 1rem 1.5rem;
  }

  .nav-toggle {
    display: none;
  }

  .nav-menu {
    position: static;
    width: auto;
    height: auto;
    padding: 0;
    box-shadow: none;
    border-left: 0;
    background: transparent;
  }

  .nav-menu ul {
    flex-direction: row;
    gap: var(--space-sm);
  }

  .nav-menu a {
    font-size: 1rem;
  }

  .nav-overlay {
    display: none;
  }
}

.main {
  flex: 1;
  padding: var(--space-xl) 0;
}

.card,
.card-subtle {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 1px 3px var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 0;
}

.card-subtle {
  background: rgba(31, 31, 31, 0.8);
}

.viz-card {
  position: relative;
  background: linear-gradient(180deg, rgba(36, 41, 54, 0.98), rgba(24, 24, 24, 0.98));
  border: 1px solid rgba(80, 155, 220, 0.28);
  box-shadow: 0 1px 3px var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.viz-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: linear-gradient(90deg, var(--primary), rgba(80, 155, 220, 0.15), var(--accent));
}

.viz-card canvas {
  display: block;
  width: 100%;
  margin: var(--space-md) 0 var(--space-sm);
  background: rgba(10, 10, 10, 0.35);
  border: 1px solid rgba(193, 200, 215, 0.08);
  border-radius: var(--radius-md);
}

.calculator {
  max-width: 900px;
  margin: 0 auto;
}

.calc-panel {
  display: grid;
  gap: var(--space-lg);
}

.form-group {
  margin-bottom: 0;
}

.form-label,
legend.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--text-heading);
}

.form-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: 1rem;
  font-family: var(--font-sans);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--secondary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(42, 132, 210, 0.2);
}

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

.form-help {
  margin: var(--space-xs) 0 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.45;
}

.control-shell {
  display: grid;
  gap: var(--space-md);
  margin: 0;
  padding: var(--space-md);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0.015));
}

.radio-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm);
}

.wire-group {
  border: none;
  padding: 0;
  margin: 0;
}

.radio-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  min-height: 78px;
  min-width: 0;
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  user-select: none;
}

.radio-card:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-emphasis);
  border-color: rgba(80, 155, 220, 0.28);
}

.radio-card input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.radio-card:has(input:checked) {
  background: linear-gradient(180deg, #1468b0, #0b5d9a);
  border-color: rgba(102, 173, 230, 0.95);
  color: var(--text-emphasis);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

.radio-card:has(input:focus-visible) {
  box-shadow: 0 0 0 3px rgba(42, 132, 210, 0.22);
}

.radio-card span {
  position: relative;
  z-index: 1;
}

.radio-card:has(input:checked) span {
  color: #f7fbff;
}

.wire-option-name {
  line-height: 1.2;
}

.wire-diagram {
  display: block;
  width: min(100%, 10.5rem);
  height: auto;
  max-height: 3.25rem;
  overflow: visible;
  pointer-events: none;
}

.wire-sheath,
.wire-sheath-outline,
.wire-strand {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.wire-sheath-outline {
  stroke: rgba(255, 255, 255, 0.24);
  stroke-width: 21;
}

.wire-diagram--wf16 .wire-sheath-outline {
  stroke-width: 18;
}

.wire-sheath {
  stroke-width: 17;
}

.wire-diagram--wf16 .wire-sheath {
  stroke-width: 15;
}

.wire-sheath--brown {
  stroke: #6b4a2d;
}

.wire-sheath--green {
  stroke: #66714a;
}

.wire-sheath--black {
  stroke: #252525;
}

.wire-strand {
  stroke-width: 3.5;
}

.wire-strand--copper {
  stroke: #c47b45;
}

.wire-strand--steel {
  stroke: #b7bdc0;
}

.action-row {
  display: grid;
  gap: var(--space-sm);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  min-width: 0;
  padding: 0.85rem 1.35rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.035);
  color: var(--text-primary);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  min-height: 48px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.diagram-text,
.viz-transcript {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.accessible-description--visible {
  position: static !important;
  width: auto !important;
  height: auto !important;
  overflow: visible !important;
  clip: auto !important;
  clip-path: none !important;
  white-space: normal !important;
  margin: var(--space-sm) 0 var(--space-lg);
  padding: var(--space-sm) var(--space-md);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: rgba(236, 185, 15, 0.08);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.description-toggle {
  margin-top: var(--space-sm);
  min-height: 44px;
}

/* Inline calculator error / warning message (aria-live target) */
.calc-error {
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid rgba(242, 102, 95, 0.5);
  border-left: 3px solid #f2665f;
  border-radius: var(--radius-sm);
  background: rgba(242, 102, 95, 0.1);
  color: #ffd6d3;
  font-size: 0.9375rem;
  line-height: 1.5;
}

/* ---- Antenna reference cards (details/summary) ---- */
details.card > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 0.75rem;
  cursor: pointer;
  list-style: none;
  min-height: 44px;
  user-select: none;
}

details.card > summary::-webkit-details-marker {
  display: none;
}

details.card > summary:hover .antenna-name {
  color: var(--text-emphasis);
}

details.card > summary:focus-visible {
  outline: 2px solid rgba(42, 132, 210, 0.75);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

details.card[open] > summary {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.antenna-name {
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--text-heading);
}

.antenna-meta {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* ---- Antenna diagram SVGs (shared classes) ---- */
.ant-wire { stroke: #4da3e8; stroke-width: 3; fill: none; stroke-dasharray: none; }
.ant-feed { stroke: var(--accent); stroke-width: 2.5; fill: none; stroke-dasharray: 6 4; }
.ant-support-line { stroke: #8a93a5; stroke-width: 2; fill: none; stroke-dasharray: 2 5; stroke-linecap: round; }
.ant-label { fill: var(--text-primary); font-family: var(--font-sans); font-size: 13px; }
.ant-dim { fill: var(--accent); font-family: var(--font-sans); font-size: 12px; }
.ant-support { fill: #4da3e8; }
.ant-match { fill: #1f1f1f; stroke: var(--accent); stroke-width: 2; }

.diagram-key {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  margin: 0 0 var(--space-lg);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.025);
}

.diagram-key-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.diagram-key-line {
  display: inline-block;
  width: 2.5rem;
  border-top-width: 3px;
  flex: 0 0 auto;
}

.diagram-key-line--wire {
  border-top-style: solid;
  border-top-color: #4da3e8;
}

.diagram-key-line--feed {
  border-top-style: dashed;
  border-top-color: var(--accent);
}

.diagram-key-line--support {
  border-top-style: dotted;
  border-top-color: #8a93a5;
}

.btn:hover {
  text-decoration: none;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-emphasis);
  border-color: rgba(80, 155, 220, 0.24);
}

.btn-primary {
  border: 1px solid rgba(80, 155, 220, 0.9);
  background: linear-gradient(180deg, #1468b0, #0b5d9a);
  color: var(--text-emphasis);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.btn-primary:hover {
  background: linear-gradient(180deg, #1a74bf, #0b5d9a);
  border-color: rgba(102, 173, 230, 0.95);
}

.btn-secondary {
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-heading);
}

.btn-secondary:hover {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
}

.btn-utility {
  border-color: rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.025);
  color: var(--text-secondary);
}

.btn-utility:hover {
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.055);
  color: var(--text-heading);
}

.results-panel {
  display: grid;
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

/* Fluid results container — separate from the calculator card.
   Uses its own responsive gutter so results expand wider on small
   screens instead of inheriting the card's conservative padding. */
.results-container {
  width: 100%;
  max-width: none;
  padding: 0 clamp(0.25rem, 1.5vw, var(--space-xl));
}

.results-block {
  margin-bottom: 0;
}

.results-block > h3 {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.results-block h3 {
  color: var(--text-heading);
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0;
  padding: 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  font-size: 0.875rem;
}

.data-table th,
.data-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  vertical-align: middle;
}

.data-table th {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.data-table tr {
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.data-table tr:last-child {
  border-bottom: none;
}

.data-table td {
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
}

/* Dimmed non-primary values in results table */
.cr-dim {
  color: var(--text-secondary);
  opacity: 0.7;
}

/* Primary cut-length cell — accent colored text, clean emphasis */
.cr-highlight {
  font-weight: 700;
}

.cr-ant-marker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.7rem;
  margin-right: 0.3rem;
  padding: 0.08rem 0.28rem;
  border: 1px solid currentColor;
  border-radius: 0.25rem;
  font-family: var(--font-sans);
  font-size: 0.625rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.02em;
  vertical-align: 0.08em;
  white-space: nowrap;
}

.text-muted,
.spec-label,
.no-rankings p {
  color: var(--text-secondary);
}

.download-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-lg);
  align-items: center;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.download-name {
  margin: 0 0 var(--space-xs);
  font-size: 1.125rem;
}

.download-product-name {
  margin-bottom: var(--space-sm);
  color: var(--text-heading);
  font-weight: 700;
}

.download-version {
  margin: var(--space-sm) 0 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.download-button {
  min-width: 12rem;
  text-align: center;
}

.antenna-specs {
  display: grid;
  gap: 0;
}

.spec-item {
  display: grid;
  grid-template-columns: minmax(110px, 130px) minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.spec-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.spec-value,
.download-name {
  color: var(--text-emphasis);
}

@media (max-width: 640px) {
  .download-card {
    grid-template-columns: 1fr;
  }

  .download-button {
    width: 100%;
  }
}

/* ---- Antenna Accordion ---- */
.antenna-accordion {
  display: grid;
  gap: var(--space-sm);
}

.antenna-item {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  background: rgba(31, 31, 31, 0.6);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.antenna-item:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.antenna-item--open {
  border-color: color-mix(in srgb, var(--ant-accent) 40%, transparent);
}

.antenna-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.85rem 1rem;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 1rem;
  min-height: 48px;
  transition: background-color var(--transition-fast);
}

.antenna-header:hover {
  background: rgba(255, 255, 255, 0.03);
}

.antenna-header:focus-visible {
  outline: 2px solid rgba(42, 132, 210, 0.75);
  outline-offset: -2px;
}

.antenna-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-md);
  background: var(--ant-tint);
  color: var(--ant-accent);
  border: 1.5px solid color-mix(in srgb, var(--ant-accent) 55%, transparent);
  font-size: 1rem;
  font-weight: 800;
  font-family: var(--font-sans);
  flex-shrink: 0;
  line-height: 1;
}

.antenna-title {
  font-weight: 700;
  color: var(--text-heading);
  font-size: 0.9375rem;
  white-space: nowrap;
}

.antenna-summary {
  color: var(--text-secondary);
  font-size: 0.8125rem;
  margin-left: auto;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.antenna-chevron {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: transform 0.35s ease;
  flex-shrink: 0;
  margin-left: 0.5rem;
}

.antenna-item--open .antenna-chevron {
  transform: rotate(90deg);
}

.antenna-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 1rem;
}

.antenna-item--open .antenna-body {
  /* max-height set by JS */
  padding: 0 1rem 1rem 1rem;
}

.antenna-specs {
  display: grid;
  gap: 0;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.antenna-channels {
  margin-bottom: 0.75rem;
}

.antenna-channels-label {
  margin-bottom: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-heading);
}

.antenna-channel-list {
  list-style: none;
  display: grid;
  gap: 0.5rem;
}

.antenna-channel {
  display: grid;
  gap: 0.15rem;
  padding: 0.5rem 0.65rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  background: rgba(10, 10, 10, 0.22);
}

.antenna-channel-freq {
  font-weight: 700;
  color: var(--text-emphasis);
  font-size: 0.9375rem;
}

.antenna-channel-meta {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

/* ---- Calc Results: single table, responsive ---- */

/* Force table to fit viewport width on all screens */
.cr-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.cr-table {
  table-layout: fixed;
  width: 100%;
  word-break: break-word;
}

.cr-col-freq { width: 16%; }
.cr-col-wave { width: 28%; }

.cr-table th,
.cr-table td {
  overflow: hidden;
  text-overflow: ellipsis;
}

.cr-table th {
  white-space: nowrap;
  padding: 0.55rem 0.85rem;
}

.cr-table td {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  padding: 0.6rem 0.85rem;
}

.cr-freq-cell {
  font-weight: 700;
  color: var(--text-emphasis);
}

/* Header abbreviation toggle — default: show full text, hide abbreviation */
.th-abbr { display: none; }
.th-full { display: inline; }

/* Value abbreviation toggle — default: show full text, hide abbreviation */
.val-abbr { display: none; }
.val-full { display: inline; }

/* Mobile: compact table to fit small screens */
@media (max-width: 767px) {
  .cr-table {
    font-size: 0.6875rem;
  }

  .cr-table th,
  .cr-table td {
    padding: 0.35rem 0.25rem;
  }

  .cr-table th {
    font-size: 0.625rem;
    letter-spacing: 0.02em;
  }

  /* Show abbreviated headers on mobile, hide full text */
  .th-full { display: none; }
  .th-abbr { display: inline; }

  /* Show abbreviated values on mobile */
  .val-full { display: none; }
  .val-abbr { display: inline; }

  /* Let the table scroll horizontally within its wrapper only */
  .results-container {
    padding: 0;
    overflow: visible;
  }

  .cr-table-wrap {
    width: 100%;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.5rem;
  }

  .cr-table {
    table-layout: fixed;
    width: 100%;
  }

  /* Ensure results panel doesn't clip */
  .results-panel {
    overflow: visible;
  }
}

/* Desktop: normal table sizing, show full headers and values */
@media (min-width: 768px) {
  .th-full { display: inline; }
  .th-abbr { display: none; }
  .val-full { display: inline; }
  .val-abbr { display: none; }

  .cr-table th {
    padding: 0.55rem 0.85rem;
  }

  .cr-table td {
    padding: 0.6rem 0.85rem;
  }
}

/* Overflow safety */
.calc-results,
.cr-table-wrap {
  min-width: 0;
  max-width: 100%;
  overflow-wrap: break-word;
}

.antenna-channel-lengths {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-primary);
  line-height: 1.5;
}


.content-page {
  max-width: 800px;
  margin: 0 auto;
}

.content-page .card,
.content-page .card-subtle,
.content-page .viz-card {
  margin-bottom: var(--space-xl);
}

.content-page details.card > ul,
.content-page details.card > ol {
  padding-inline-start: 1.4rem;
}

.content-page details.card > ul li,
.content-page details.card > ol li {
  padding-inline-start: 0.2rem;
}

.content-page h2 {
  margin-top: var(--space-2xl);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(80, 155, 220, 0.22);
  box-shadow: inset 0 1px 0 rgba(236, 185, 15, 0.08);
}

.data-table {
  margin: var(--space-md) 0;
}

.text-center { text-align: center; }
.hidden { display: none !important; }

input[type="range"] {
  height: 28px;
  min-height: 28px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--text-emphasis);
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--text-emphasis);
  cursor: pointer;
}

.viz-card output.viz-value,
.viz-card output.viz-readout {
  display: block;
  min-height: 1.4em;
  font-variant-numeric: tabular-nums;
}

.viz-card .wave-readout[role="status"] {
  font-variant-numeric: tabular-nums;
}

@media (max-width: 767px) {
  .content-page details.card > ul,
  .content-page details.card > ol {
    padding-inline-start: 1.2rem;
  }

  .diagram-key {
    display: grid;
    gap: var(--space-xs);
  }

  .radio-card {
    min-height: 76px;
    padding: 0.5rem 0.45rem;
  }

  .wire-diagram {
    width: min(100%, 7.5rem);
    max-height: 2.35rem;
  }

  .card,
  .card-subtle {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }

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

  /* On mobile, results container uses minimal fluid gutter
     so cards use nearly the full viewport width */
  .results-container {
    padding: 0 clamp(0.25rem, 1vw, 0.75rem);
  }

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

  .antenna-header {
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.7rem 0.75rem;
  }

  .antenna-summary {
    order: 10;
    width: 100%;
    margin-left: 0;
    padding-left: calc(2rem + 0.75rem); /* align past badge */
    white-space: normal;
  }

  .antenna-body {
    padding: 0 0.75rem;
  }

  .antenna-item--open .antenna-body {
    padding: 0 0.75rem 0.75rem 0.75rem;
  }

  .antenna-channel-lengths {
    font-size: 0.6875rem;
  }

  .viz-card {
    padding: var(--space-md) !important;
  }

  .viz-card canvas {
    margin: var(--space-sm) 0;
    max-width: 100%;
    height: auto;
  }

  .viz-card > [id$="Controls"] {
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
  }

  .viz-card .viz-controls input[type="range"].viz-slider {
    display: block;
    width: 100%;
    height: 48px;
    min-height: 48px;
    margin: 0;
    touch-action: pan-y;
  }

  .viz-card .card-header {
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
  }

  .viz-card .card-title {
    font-size: 1.1rem;
    line-height: 1.3;
  }

  .viz-card > p.text-muted {
    margin-bottom: var(--space-lg);
    font-size: 0.875rem;
    line-height: 1.5;
    padding: 0 var(--space-xs);
  }
}

@media (min-width: 768px) {
  h1 {
    font-size: clamp(1.875rem, 3vw, 2.25rem);
  }

  .main {
    padding: 3rem 0;
  }

  .card,
  .card-subtle,
  .viz-card {
    padding: 2rem;
  }

  .calculator {
    max-width: 960px;
  }

  .content-page {
    max-width: 960px;
  }

  .control-shell {
    max-width: 640px;
    margin: 0 auto;
    padding: 1.25rem 1.5rem;
    gap: 1rem;
    justify-items: center;
    justify-content: center;
  }

  .radio-grid {
    grid-template-columns: repeat(2, minmax(140px, 1fr));
    justify-content: center;
  }

  .action-row {
    grid-auto-flow: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
  }

  .wire-group {
    display: grid;
    align-items: center;
    text-align: center;
    gap: 0.55rem;
    width: 100%;
  }

  .action-row .btn {
    width: auto;
    min-width: 108px;
  }

  .radio-card {
    min-height: 84px;
    padding: 0.55rem 0.8rem;
    background: rgba(255, 255, 255, 0.025);
    border-color: rgba(255, 255, 255, 0.1);
  }

  .radio-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.16);
  }

  .radio-card:has(input:checked) {
    border-color: rgba(80, 155, 220, 0.95);
    background: linear-gradient(180deg, #1468b0, #0b5d9a);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14), 0 0 0 1px rgba(42, 132, 210, 0.18);
  }

  .wire-group .form-label {
    margin-bottom: 0;
  }

  .btn-secondary,
  .btn-utility {
    box-shadow: none;
  }

  .results-panel {
    gap: 2.5rem;
    margin-top: 2.5rem;
  }

  .results-panel > * {
    min-width: 0;
  }

  /* Results container constrained to match calculator card width */
  .results-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0;
  }

  .cr-table-wrap,
  .table-scroll {
    width: 100%;
    max-width: 100%;
  }

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

  .antenna-item {
    max-width: 960px;
    margin: 0 auto;
    width: 100%;
  }
}

@media (min-width: 1024px) {
  .wire-diagram {
    width: min(100%, 11rem);
    max-height: 3.4rem;
  }

  .radio-card {
    min-height: 88px;
  }

  .header-content {
    padding: 1rem 1.5rem;
  }

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

  .nav-menu a {
    font-size: 1.0625rem;
    padding-inline: 1rem;
  }

  .results-panel {
    gap: 3rem;
    margin-top: 3rem;
  }

  .footer {
    width: 100%;
    margin-top: auto;
  }
}

@media (min-width: 1440px) {
  .wire-diagram {
    width: min(100%, 11.5rem);
    max-height: 3.55rem;
  }

  .radio-card {
    min-height: 90px;
  }

  .results-panel {
    gap: 3.5rem;
    margin-top: 3.5rem;
  }

  .content-page,
  .antenna-item,
  .calculator {
    max-width: 960px;
  }
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-sm);
  font-size: 0.875rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--text-emphasis);
  text-decoration: underline;
}
/* Footer */
footer.footer,
footer.footer .footer-content,
footer.footer .footer-text,
footer.footer p {
  text-align: center !important;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
}

.print-header,
.print-report {
  display: none;
}

.app-version {
  color: var(--text-secondary);
  font-size: 0.72em;
  font-weight: 500;
  white-space: nowrap;
}

@media print {
  @page {
    margin: 0.5cm;
    size: auto;
  }

  /* Hide everything except results */
  .header,
  .footer,
  .nav-toggle,
  .nav-overlay,
  .action-row,
  .skip-link,
  .viz-controls,
  .viz-card,
  canvas[id*="Canvas"],
  [id*="Controls"],
  .daynight-summary,
  .pattern-compare-verdict,
  .polarization-strength-bar,
  .calculator,
  .calc-panel,
  .control-shell,
  .form-group,
  .radio-grid,
  .wire-group,
  .sr-only,
  #calculatorPanel,
  #calcStatus,
  #calcError,
  .antenna-chevron {
    display: none !important;
  }

  /* Force results visible */
  #resultsArea,
  .results-container,
  .results-panel,
  .results-block,
  .calc-results,
  #antennaAccordion,
  .antenna-body,
  .antenna-item {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
  }

  /* Neutral base for the legacy interactive print path. The dedicated
     .print-report block below handles its own colors and markers. */
  body, .main, .container, .content-page {
    background: #ffffff !important;
    color: #000000 !important;
    font-family: system-ui, -apple-system, sans-serif !important;
  }

  .card, .calculator, .results-panel, .results-block, .data-table, .cr-table, .antenna-item {
    box-shadow: none !important;
    text-shadow: none !important;
  }

  body, .main, .container, .content-page {
    background: #ffffff !important;
    color: #000000 !important;
    margin: 0 !important;
    padding: 0 !important;
    max-width: 100% !important;
    font-family: system-ui, -apple-system, sans-serif !important;
  }

  /* Compact print header - no border, just text */
  .print-header {
    display: block !important;
    text-align: left;
    margin: 0 0 0.4rem 0 !important;
    padding: 0 !important;
    border: none !important;
  }

  .print-header h1 {
    font-size: 1.1rem !important;
    font-weight: 700 !important;
    margin: 0 !important;
    color: #000 !important;
    line-height: 1.2 !important;
  }

  .print-header p {
    font-size: 0.75rem !important;
    margin: 0.1rem 0 0 !important;
    color: #555 !important;
    line-height: 1.2 !important;
  }

  /* Compact section headings */
  .results-block > h3 {
    font-size: 0.85rem !important;
    font-weight: 700 !important;
    margin: 0.6rem 0 0.3rem 0 !important;
    padding: 0 !important;
    border-bottom: 1px solid #000 !important;
    color: #000 !important;
    break-after: avoid !important;
    page-break-after: avoid !important;
  }

  /* Ultra-compact table */
  .table-scroll {
    overflow: visible !important;
    margin: 0 !important;
  }

  .data-table, .cr-table {
    width: 100% !important;
    border-collapse: collapse !important;
    font-size: 0.75rem !important;
    margin: 0 !important;
    border: 1px solid #000 !important;
    break-inside: auto !important;
    page-break-inside: auto !important;
  }

  .data-table thead {
    display: table-header-group !important;
  }

  .data-table th,
  .data-table td,
  .cr-table th,
  .cr-table td {
    border: 1px solid #000 !important;
    padding: 0.15rem 0.3rem !important;
    background: #ffffff !important;
    color: #000000 !important;
    font-size: 0.75rem !important;
    line-height: 1.2 !important;
    vertical-align: middle !important;
  }

  .data-table th,
  .cr-table th {
    background: #e8e8e8 !important;
    font-weight: 700 !important;
    text-transform: none !important;
    letter-spacing: 0 !important;
  }

  .data-table tr,
  .cr-table tr {
    break-inside: avoid !important;
    page-break-inside: avoid !important;
  }

  /* Show abbreviated values, hide full text */
  .th-abbr { display: inline !important; }
  .th-full { display: none !important; }
  .val-abbr { display: inline !important; }
  .val-full { display: none !important; }

  /* Compact antenna items */
  .antenna-item {
    break-inside: avoid !important;
    page-break-inside: avoid !important;
    margin: 0.3rem 0 !important;
    padding: 0.4rem !important;
    border: 1px solid #000 !important;
    border-radius: 0 !important;
    background: #ffffff !important;
  }

  .antenna-header {
    display: flex !important;
    align-items: baseline !important;
    gap: 0.35rem !important;
    width: 100% !important;
    min-height: 0 !important;
    margin: 0 !important;
    padding: 0 0 0.2rem !important;
    border: 0 !important;
    text-align: left !important;
  }

  .antenna-body {
    max-height: none !important;
    overflow: visible !important;
    display: block !important;
    padding: 0 !important;
  }

  /* Horizontal inline specs */
  .antenna-specs {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 0.3rem 0.8rem !important;
    margin: 0 0 0.3rem 0 !important;
    padding: 0 0 0.2rem 0 !important;
    border-bottom: 1px solid #ccc !important;
    font-size: 0.75rem !important;
  }

  .spec-item {
    display: inline !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .spec-label {
    font-weight: 700 !important;
    font-size: 0.75rem !important;
    color: #000 !important;
  }

  .spec-value {
    font-size: 0.75rem !important;
    color: #000 !important;
  }

  /* Compact channels list */
  .antenna-channels {
    margin: 0 !important;
    padding: 0 !important;
  }

  .antenna-channels-label {
    font-size: 0.75rem !important;
    font-weight: 700 !important;
    margin: 0 0 0.15rem 0 !important;
    padding: 0 !important;
    color: #000 !important;
  }

  .antenna-channel-list {
    list-style: none !important;
    padding: 0 !important;
    margin: 0 !important;
    display: block !important;
    gap: 0 !important;
  }

  .antenna-channel {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 0 0.6rem !important;
    padding: 0.1rem 0 !important;
    border: none !important;
    border-bottom: 1px dotted #aaa !important;
    border-radius: 0 !important;
    background: transparent !important;
    font-size: 0.75rem !important;
    line-height: 1.3 !important;
  }

  .antenna-channel:last-child {
    border-bottom: none !important;
  }

  .antenna-channel-freq {
    font-weight: 700 !important;
    min-width: 5rem !important;
  }

  .antenna-channel-meta {
    color: #333 !important;
  }

  .antenna-channel-lengths {
    color: #555 !important;
    font-size: 0.7rem !important;
  }

  /* Hide badge circle, keep number inline */
  .antenna-badge {
    display: inline !important;
    width: auto !important;
    height: auto !important;
    border: none !important;
    background: none !important;
    color: #000 !important;
    font-size: 0.85rem !important;
    font-weight: 700 !important;
    margin-right: 0.3rem !important;
  }

  .antenna-title {
    font-size: 0.85rem !important;
    font-weight: 700 !important;
    display: inline !important;
  }

  .antenna-summary {
    font-size: 0.7rem !important;
    color: #555 !important;
    display: block !important;
    flex: 1 1 auto !important;
    width: auto !important;
    margin: 0 !important;
    padding: 0 !important;
    white-space: normal !important;
  }

  .cr-ant-marker {
    display: inline-flex !important;
    min-width: 1.45rem !important;
    margin-right: 0.2rem !important;
    padding: 0.02rem 0.18rem !important;
    border: 1px solid #000 !important;
    border-radius: 0 !important;
    background: #fff !important;
    color: #000 !important;
    font-size: 0.6rem !important;
    line-height: 1.15 !important;
  }

  /* Links */
  a {
    color: #000000 !important;
    text-decoration: none !important;
  }

  /* Utility */
  p, ul, ol {
    margin-bottom: 0.2rem !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }

  .polarization-strength-bar {
    transition: none !important;
  }
}

/* Dedicated calculator report. Kept after the legacy print rules so the
   report remains isolated from interactive accordion sizing and overflow. */
@media print {
  @page {
    size: auto;
    margin: 10mm;
    @top-left { content: none; }
    @top-center { content: none; }
    @top-right { content: none; }
    @bottom-left { content: none; }
    @bottom-center { content: none; }
    @bottom-right { content: none; }
  }

  html,
  body {
    width: auto !important;
    min-width: 0 !important;
    height: auto !important;
    min-height: 0 !important;
    display: block !important;
    margin: 0 !important;
    padding: 0 !important;
    background: #fff !important;
  }

  body > .header,
  body > .footer,
  .main > .container {
    display: none !important;
  }

  .main {
    display: block !important;
    width: auto !important;
    height: auto !important;
    min-height: 0 !important;
    flex: none !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .print-report {
    display: block !important;
    width: 100% !important;
    max-width: none !important;
    margin: 0 !important;
    padding: 0 !important;
    color: #000 !important;
    background: #fff !important;
    font-family: Arial, Helvetica, sans-serif !important;
    font-size: 10pt !important;
    line-height: 1.3 !important;
  }

  /* Remove the top/bottom report header/footer and their separator lines. */
  .print-report-header,
  .print-report-footer {
    display: none !important;
  }

  .print-report h2 {
    margin: 6mm 0 2mm !important;
    padding: 0 !important;
    border: 0 !important;
    color: #000 !important;
    font-size: 10pt !important;
    line-height: 1.2 !important;
    break-after: avoid !important;
    page-break-after: avoid !important;
  }

  .print-table {
    display: table !important;
    width: 100% !important;
    table-layout: fixed !important;
    border-collapse: collapse !important;
    margin: 0 !important;
    border: 0.75pt solid #555 !important;
    font-size: 10pt !important;
  }

  .print-table thead {
    display: table-header-group !important;
  }

  .print-table tbody {
    display: table-row-group !important;
  }

  .print-table tr {
    display: table-row !important;
    break-inside: avoid !important;
    page-break-inside: avoid !important;
  }

  .print-table th,
  .print-table td {
    display: table-cell !important;
    padding: 1.5mm 2mm !important;
    border: 0.5pt solid #777 !important;
    color: #000;
    background: #fff;
    font-size: 10pt !important;
    line-height: 1.25 !important;
    text-align: left !important;
    vertical-align: top !important;
    white-space: normal !important;
    overflow: visible !important;
    overflow-wrap: anywhere !important;
  }

  .print-table th {
    background: #e8e8e8 !important;
    font-weight: 700 !important;
  }

  /* Preserve shared-antenna accent colors and A1/A2 markers in print. */
  .print-report .cr-highlight {
    font-weight: 700 !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  .print-report .cr-dim {
    color: #000 !important;
  }

  .print-report .cr-ant-marker {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.6rem;
    margin-right: 0.25rem;
    padding: 0.08rem 0.28rem;
    border: 1px solid currentColor;
    border-radius: 0.25rem;
    font-size: 8pt;
    font-weight: 800;
    line-height: 1.2;
    vertical-align: 0.08em;
    white-space: nowrap;
    font-family: Arial, Helvetica, sans-serif !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  .print-results-table th:first-child,
  .print-results-table td:first-child {
    width: 14% !important;
  }

  .print-shared-table th:nth-child(1),
  .print-shared-table td:nth-child(1) {
    width: 10% !important;
  }

  .print-shared-table th:nth-child(2),
  .print-shared-table td:nth-child(2) {
    width: 18% !important;
  }

  .print-shared-table th:nth-child(3),
  .print-shared-table td:nth-child(3) {
    width: 27% !important;
  }

  .print-shared-table th:nth-child(4),
  .print-shared-table td:nth-child(4) {
    width: 29% !important;
  }

  .print-shared-table th:nth-child(5),
  .print-shared-table td:nth-child(5) {
    width: 16% !important;
  }
}