/* ============================================================================
   TILE-BASED EV COST COMPARISON DESIGN
   ============================================================================ */

/* CSS Variables for consistent theming */
:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --accent-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;

  --bg-primary: #e5e7eb; /* moodier light background */
  --bg-secondary: #e2e8f0; /* secondary surface */
  --bg-tertiary: #cbd5e1; /* tertiary surface */
  --bg-dark: #0f172a;

  --text-primary: #1e293b;
  --text-secondary: #334155; /* stronger contrast */
  --text-muted: #94a3b8;

  --border-color: #94a3b8; /* darker borders for contrast */
  --border-focus: #2563eb;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1),
    0 4px 6px -4px rgb(0 0 0 / 0.1);

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

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

/* Dark mode variables */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --border-color: #334155;
}

/* Dark mode support for system preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
  }
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  font-size: 16px;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.5rem;
}
h4 {
  font-size: 1.25rem;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.content-section {
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.content-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    rgba(37, 99, 235, 0.02) 0%,
    rgba(16, 185, 129, 0.02) 100%
  );
  pointer-events: none;
  z-index: 0;
}

.content-section > * {
  position: relative;
  z-index: 1;
}

/* Header */
.main-header {
  background: var(--bg-primary);
  padding: var(--spacing-lg) 0;
  margin-bottom: var(--spacing-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.main-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(37, 99, 235, 0.05) 0%,
    rgba(16, 185, 129, 0.05) 50%,
    rgba(37, 99, 235, 0.02) 100%
  );
  pointer-events: none;
}

.site-name {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.strap-line {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: var(--bg-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  transform: translateY(-1px);
}

.theme-toggle-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.theme-switch {
  position: relative;
  width: 40px;
  height: 20px;
  background: var(--bg-tertiary);
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.theme-switch::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: var(--bg-primary);
  border-radius: 50%;
  transition: transform 0.3s ease;
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .theme-switch {
  background: transparent;
}

[data-theme="dark"] .theme-switch::before {
  transform: translateX(20px);
}

.theme-icon {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 10px;
  color: var(--text-muted);
  transition: color 0.3s ease;
}

.theme-icon.sun {
  left: 6px;
}

.theme-icon.moon {
  right: 6px;
}

/* Light mode: show Sun, hide Moon */
.theme-icon.sun {
  color: #fbbf24; /* Yellow */
  opacity: 1;
  pointer-events: auto;
}

.theme-icon.moon {
  opacity: 0;
  pointer-events: none;
}

/* Dark mode: show Moon, hide Sun */
[data-theme="dark"] .theme-icon.moon {
  color: #1e40af; /* Blue */
  opacity: 1;
  pointer-events: auto;
}

[data-theme="dark"] .theme-icon.sun {
  opacity: 0;
  pointer-events: none;
}

/* Navigation */
.main-nav {
  margin-bottom: var(--spacing-lg);
}

.main-nav ul {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  list-style: none;
}

.main-nav a {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.main-nav a:hover {
  color: var(--primary-color);
  background: var(--bg-secondary);
}

.main-nav a i {
  font-size: 1rem;
  transition: transform 0.2s ease;
}

/* Section headings */
.content-section h3 {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 600;
}

.content-section h3 i {
  color: var(--primary-color);
  font-size: 1.25rem;
}

/* Country selector */
.country-select {
  margin-bottom: var(--spacing-lg);
}

.flex-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.flex-container i {
  color: var(--primary-color);
  font-size: 1.25rem;
}

.country-options {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.country-options:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Tile grid */
.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.tile {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all 0.2s ease;
  position: relative;
}

.tile:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.tile:has(.popup.open-popup):hover {
  border-color: var(--primary-color);
}

/* Prevent stacking-context/clipping issues while a popup is open */
.tile:has(.popup.open-popup) {
  transform: none !important;
}

.content-section:has(.popup.open-popup) {
  overflow: visible !important;
}

/* Tile header */
.tile-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.tile-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 1rem;
}

.tile-title i {
  color: var(--primary-color);
  font-size: 1.1rem;
  transition: transform 0.2s ease;
}

/* Tile info */
.tile-info {
  position: relative;
}

.info {
  width: 20px;
  height: 20px;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s ease;
  filter: brightness(1);
}

.info:hover {
  opacity: 1;
}

[data-theme="dark"] .info {
  filter: brightness(0) invert(1);
  opacity: 0.9;
}

[data-theme="dark"] .info:hover {
  opacity: 1;
  filter: brightness(0) invert(1) brightness(1.2);
}

/* Popup */
.popup {
  width: 400px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.1);
  text-align: center;
  padding: 0 30px 30px;
  color: var(--text-primary);
  visibility: hidden;
  opacity: 0;
  transition: transform 0.4s, opacity 0.4s;
  z-index: 1001;
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
}

.popup.open-popup {
  visibility: visible;
  opacity: 1 !important;
  transform: translate(-50%, -50%) scale(1);
  outline: none;
}

.popup.open-popup:focus-within {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Dark mode popup styling */
[data-theme="dark"] .popup {
  background: var(--bg-primary);
  border-color: var(--border-color);
  box-shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.5),
    0 4px 6px -4px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.1),
    0 0 20px rgba(59, 130, 246, 0.1);
  color: var(--text-primary);
}
/* Ensure links are readable inside popups */
.popup a {
  color: var(--primary-color);
}
.popup a:hover,
.popup a:focus {
  text-decoration: underline;
}
/* Dark mode: use lighter link color for contrast inside popups */
[data-theme="dark"] .popup a {
  color: #93c5fd; /* Tailwind sky-300 */
}
[data-theme="dark"] .popup a:hover,
[data-theme="dark"] .popup a:focus {
  color: #bfdbfe; /* sky-200 */
  text-decoration: underline;
}

[data-theme="dark"] .popup h2 {
  color: var(--text-primary);
  font-weight: 600;
}

[data-theme="dark"] .popup p {
  color: var(--text-secondary);
}

[data-theme="dark"] .popup .info {
  filter: brightness(0) invert(1);
}

[data-theme="dark"] .popup .info:hover {
  filter: brightness(0) invert(1) brightness(1.2);
}

/* Ensure popup content is fully opaque */
.popup.open-popup * {
  opacity: 1 !important;
}

/* Override info icon opacity inside popups */
.popup .info {
  opacity: 1 !important;
}

[data-theme="dark"] .popup .info {
  opacity: 1 !important;
}

.popup h2 {
  font-size: 38px;
  font-weight: 500;
  margin: 30px 0 10px;
  color: var(--text-primary);
}

.popup p {
  font-size: 16px;
  line-height: 1.5;
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.closePopupBtn {
  width: 100%;
  margin-top: 50px;
  padding: 10px 0;
  background: var(--primary-color);
  color: #fff;
  outline: none;
  font-size: 18px;
  border-radius: 4px;
  cursor: pointer;
  box-shadow: 0 5px 5px rgba(0, 0, 0, 0.2);
  border: none;
  transition: background-color 0.2s ease;
}

.closePopupBtn:hover {
  background: var(--primary-hover);
}

.popup img {
  width: 100px;
  margin-top: 15px;
  border-radius: 50%;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .popup img {
  filter: brightness(0) invert(1);
}

.popup h2 {
  font-size: 38px;
  font-weight: 500;
  margin: 30px 0 10px;
  color: var(--text-primary);
}

.popup button {
  width: 100%;
  margin-top: 50px;
  padding: 10px 0;
  background: var(--primary-color);
  color: #fff;
  outline: none;
  font-size: 18px;
  border-radius: 4px;
  cursor: pointer;
  box-shadow: 0 5px 5px rgba(0, 0, 0, 0.2);
  border: none;
  transition: background-color 0.2s ease;
}

.popup button:hover {
  background: var(--primary-hover);
}

/* Tile input */
.tile-input {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color 0.2s ease;
}

.tile-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Checkbox tile */
.checkbox-tile {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all 0.2s ease;
  position: relative;
}

.checkbox-tile:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.checkbox-tile input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--primary-color);
}

.checkbox-tile .tile-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

.checkbox-tile .tile-info {
  margin-left: auto;
  flex-shrink: 0;
}

/* Input field container and toggle styles */
.input-field-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.input-toggle {
  display: inline-flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 2px;
  gap: 2px;
  width: fit-content;
  align-self: flex-end;
  margin-left: auto;
}

.toggle-option {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.75rem;
  font-weight: 500;
  position: relative;
  min-width: 60px;
  flex: 1;
  max-width: 80px;
}

.toggle-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-option span {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.toggle-option input[type="radio"]:checked + span {
  color: var(--text-primary);
}

.toggle-option:has(input[type="radio"]:checked) {
  background: var(--primary-color);
  color: white;
}

.toggle-option:has(input[type="radio"]:checked) span {
  color: white;
}

.toggle-option:hover:not(:has(input[type="radio"]:checked)) {
  background: var(--bg-secondary);
}

.conversion-display {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: var(--spacing-xs);
  min-height: 1rem;
}

/* Results toggle container */
.results-toggle-container {
  margin: var(--spacing-md) 0;
  display: flex;
  justify-content: flex-end;
  width: 100%;
}

.results-toggle {
  display: inline-flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 2px;
  gap: 2px;
  width: fit-content;
}

/* Slider container */
.slider-container {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  transition: all 0.2s ease;
  position: relative;
}

.slider-container:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.slider-tile {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  transition: all 0.2s ease;
  position: relative;
}

.slider-tile:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.slider-tile label {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.slider-track {
  position: relative;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  margin: var(--spacing-lg) 0;
}

.slider-input {
  width: 100%;
  height: 8px;
  background: transparent;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  position: absolute;
  top: 0;
  left: 0;
  /* Place input above track and prohibited area; track visuals rendered on .slider-track */
  z-index: 6;
}

.slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all 0.2s ease;
  /* Center the thumb vertically over the 8px track */
  margin-top: -6px;
}

.slider-input::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.slider-input::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-md);
  /* Center the thumb vertically over the 8px track */
  margin-top: -6px;
}

.slider-input {
  background: transparent;
}

.slider-input::-webkit-slider-runnable-track {
  /* Track visuals are rendered on .slider-track to keep layering below prohibited area */
  background: transparent;
  height: 8px;
  border-radius: 4px;
  cursor: pointer;
}

.slider-input::-moz-range-track {
  /* Track visuals are rendered on .slider-track to keep layering below prohibited area */
  background: transparent;
  height: 8px;
  border-radius: 4px;
  cursor: pointer;
}

.prohibited-area {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background-color: rgba(239, 68, 68, 0.6);
  border-radius: 4px;
  z-index: 5;
  pointer-events: none;
}

.scale-indicators {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--spacing-sm);
}

.slider-value {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.percentage {
  color: var(--primary-color);
}

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

/* EV Charging header with toggle */
.ev-charging-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.ev-charging-header h3 {
  margin: 0;
}

.ev-charging-toggle {
  display: inline-flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 2px;
  gap: 2px;
  width: fit-content;
}

.lock-btn {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 32px;
  height: 32px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lock-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
}

.lock-btn i {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Locked slider styles */
.slider-container.locked,
.slider-tile.locked {
  opacity: 0.7;
  background: var(--bg-tertiary);
  border-color: var(--text-muted);
  position: relative;
}

.slider-container.locked::before,
.slider-tile.locked::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.1);
  border-radius: var(--radius-lg);
  pointer-events: none;
  z-index: 1;
}

[data-theme="dark"] .slider-container.locked::before,
[data-theme="dark"] .slider-tile.locked::before {
  background: rgba(255, 255, 255, 0.1);
}

.slider-container.locked .slider-input,
.slider-tile.locked .slider-input {
  pointer-events: none;
}

.slider-container.locked .slider-track,
.slider-tile.locked .slider-track {
  opacity: 0.5;
}

.slider-container.locked .slider-value,
.slider-tile.locked .slider-value {
  opacity: 0.7;
}

.slider-container.locked .scale-indicators,
.slider-tile.locked .scale-indicators {
  opacity: 0.5;
}

.slider-container.locked label,
.slider-tile.locked label {
  opacity: 0.7;
}

.slider-tile[style*="display: none"] {
  display: none !important;
}

/* Calculate button */
.calculate-results-btn {
  width: 100%;
  padding: var(--spacing-lg);
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1.25rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-md);
}

.calculate-results-btn i {
  font-size: 1.1rem;
}

.calculate-results-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.calculate-results-btn:active {
  transform: translateY(0);
}

/* Results */
.result {
  margin-top: var(--spacing-lg);
}

.result-container {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
}

.result-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.result-row {
  border-bottom: 1px solid var(--border-color);
}

.result-row:last-child {
  border-bottom: none;
}

.result-label {
  padding: var(--spacing-md);
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.result-cost-cell {
  padding: var(--spacing-md);
  font-weight: 700;
  color: var(--text-primary);
  text-align: right;
  font-size: 1.1rem;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

#details-buttons {
  margin-top: var(--spacing-lg);
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.details-btn,
.costhelp-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  background: var(--primary-color);
  font-weight: 500;
  font-size: 1rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  min-width: 200px;
  justify-content: center;
  outline: none;
}

/* Prevent VED mini button from triggering primary actions styles and potential bound listeners */
.ved-mini-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  background: var(--bg-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  box-shadow: none;
}
.ved-mini-btn:hover,
.ved-mini-btn:focus {
  background: var(--bg-tertiary);
}

.details-btn:hover,
.costhelp-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Visible focus for keyboard users */
.details-btn:focus-visible,
.costhelp-btn:focus-visible,
.lock-btn:focus-visible,
.info:focus-visible {
  outline: 3px solid var(--primary-color);
  outline-offset: 2px;
}

/* Footer */
.main-footer {
  background: var(--bg-primary);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-2xl);
  text-align: center;
  border-top: 1px solid var(--border-color);
}

.main-footer-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  color: var(--text-secondary);
}

#overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: none;
}

[data-theme="dark"] #overlay {
  background: rgba(0, 0, 0, 0.7);
}

/* Mobile responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }

  .content-section {
    padding: var(--spacing-md);
  }

  .site-name {
    font-size: 2rem;
  }

  .popup {
    width: 90vw;
    max-width: 350px;
    padding: 0 20px 20px;
  }

  #overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
  }

  .main-nav {
    margin-bottom: var(--spacing-md);
  }

  .main-nav ul {
    flex-direction: row;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
  }

  .main-nav a {
    font-size: 0.875rem;
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .tile-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  #details-buttons {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
  }

  .details-btn,
  .costhelp-btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
    margin-bottom: var(--spacing-md);
  }

  .details-btn:last-child,
  .costhelp-btn:last-child {
    margin-bottom: 0;
  }

  .theme-toggle {
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .theme-toggle-label {
    display: none;
  }

  .result-container {
    overflow-x: auto;
    word-wrap: break-word;
    max-width: 100%;
  }

  /* Mobile: result container layout tweaks (no duplicate background rule) */

  .result-table {
    width: 100%;
    min-width: auto;
    max-width: 100%;
  }

  .result-label {
    font-size: 0.875rem;
    padding: var(--spacing-sm);
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: none;
  }

  .result-cost-cell {
    font-size: 1rem;
    padding: var(--spacing-sm);
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
    text-align: right;
    min-width: auto;
  }
}

@media (max-width: 480px) {
  .main-nav ul {
    flex-direction: row;
    gap: var(--spacing-sm);
  }

  .main-nav a {
    font-size: 0.75rem;
    padding: var(--spacing-xs);
  }

  .site-name {
    font-size: 1.75rem;
  }

  .strap-line {
    font-size: 1rem;
  }

  .result-container {
    padding: var(--spacing-md);
    overflow-x: auto;
    max-width: 100%;
  }

  /* Small devices: adjust spacing within result container */

  .result-table {
    font-size: 0.875rem;
    width: 100%;
    min-width: auto;
    max-width: 100%;
  }

  .result-label {
    font-size: 0.75rem;
    padding: var(--spacing-xs);
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: none;
  }

  .result-cost-cell {
    font-size: 0.875rem;
    padding: var(--spacing-xs);
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
    text-align: right;
    min-width: auto;
  }

  #details-buttons {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
  }

  .details-btn,
  .costhelp-btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
    margin-bottom: var(--spacing-md);
  }

  .details-btn:last-child,
  .costhelp-btn:last-child {
    margin-bottom: 0;
  }
}

/* Enhanced visual effects */
* {
  transition: all 0.2s ease;
}

.tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.tile:hover .tile-title i {
  transform: scale(1.1);
  color: var(--primary-color);
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.calculate-results-btn:hover {
  animation: pulse 1s ease-in-out;
}

.tile-title i,
.content-section h3 i {
  transition: transform 0.2s ease, color 0.2s ease;
}

.tile:hover .tile-title i,
.content-section:hover h3 i {
  transform: scale(1.1);
  color: var(--primary-color);
}

button:focus,
input:focus,
select:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.calculate-results-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.success {
  color: var(--accent-color);
}

.error {
  color: var(--danger-color);
}

.warning {
  color: var(--warning-color);
}

/* Info page specific styles */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.info-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.info-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.info-item h5 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.info-item h5 i {
  color: var(--primary-color);
  font-size: 1.2rem;
}

.info-item p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.info-item ul {
  list-style: none;
  padding: 0;
}

.info-item ul li {
  margin-bottom: 0.5rem;
}

.info-item ul li a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

.info-item ul li a:hover {
  text-decoration: underline;
}

/* Legal and Privacy page styles */
.help.container {
  max-width: 800px;
  margin: 0 auto;
}

.help.container h3 {
  color: var(--text-primary);
  margin-bottom: 2rem;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.help.container h3 i {
  color: var(--primary-color);
}

.help.container h4 {
  color: var(--text-primary);
  margin: 2rem 0 1rem 0;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.help.container h4 i {
  color: var(--primary-color);
}

.help.container h5 {
  color: var(--text-primary);
  margin: 1.5rem 0 1rem 0;
  font-size: 1.1rem;
}

.help.container p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.help.container ul {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.help.container ul li {
  margin-bottom: 0.5rem;
}

.help.container a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

.help.container a:hover {
  text-decoration: underline;
}

.help.container strong {
  color: var(--text-primary);
  font-weight: 600;
}

.help.container em {
  font-style: italic;
  color: var(--text-secondary);
}

/* Enhanced footer styles */
.main-footer {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 2rem 0;
  margin-top: 3rem;
  border-top: 1px solid var(--border-color);
}

.main-footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.footer-section ul {
  list-style: none;
  padding: 0;
}

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section ul li a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section ul li a:hover {
  color: var(--primary-color);
}

.footer-section p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
}

/* Responsive adjustments for info pages */
@media (max-width: 768px) {
  .info-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .info-item {
    padding: 1rem;
  }

  .help.container {
    padding: 0 1rem;
  }
}

/* Advanced Data Grid Styles */
.grid-container1 {
  display: grid;
  grid-template-columns: auto auto auto;
  grid-gap: 2px;
  background-color: var(--border-color);
  padding: 2px;
  margin: 1rem 0;
  border-radius: 4px;
  overflow: hidden;
}

.grid-container1 > div {
  background-color: var(--bg-secondary);
  text-align: center;
  padding: 8px;
  font-size: 0.9rem;
}

.grid-container2 {
  display: grid;
  grid-template-columns: auto auto;
  grid-gap: 2px;
  background-color: var(--border-color);
  padding: 2px;
  margin: 1rem 0;
  border-radius: 4px;
  overflow: hidden;
}

.grid-container2 > div {
  background-color: var(--bg-secondary);
  text-align: center;
  padding: 8px;
  font-size: 0.9rem;
}

.item1,
.item2,
.item3 {
  font-weight: bold;
  color: var(--text-primary);
}

/* Dark mode adjustments for grid containers */
[data-theme="dark"] .grid-container1 > div,
[data-theme="dark"] .grid-container2 > div {
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

[data-theme="dark"] .item1,
[data-theme="dark"] .item2,
[data-theme="dark"] .item3 {
  color: var(--text-primary);
}

/* Help page specific styles */
.help-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

/* Advanced Data container styling */
#cost-details-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  margin-top: 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  min-height: 100px;
  /* Visibility is controlled by JS; default hidden inline on pages */
}

#cost-details-container .result-container {
  background: var(--bg-secondary) !important;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 200px;
}

#cost-details-container h4 {
  color: var(--text-primary);
  margin: 1.5rem 0 1rem 0;
  font-size: 1.1rem;
  font-weight: 600;
}

#cost-details-container p {
  margin-bottom: 1rem;
}

#cost-details-container ul {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

#cost-details-container ul li {
  margin-bottom: 0.5rem;
}

#cost-details-container strong {
  color: var(--primary-color);
  font-weight: 600;
}

/* Dark mode adjustments for Advanced Data */
[data-theme="dark"] #cost-details-container {
  background-color: var(--bg-primary);
  border-color: var(--border-color);
}

[data-theme="dark"] #cost-details-container .result-container {
  color: var(--text-primary);
}

.help-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.help-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.help-item h4 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.help-item h4 i {
  color: var(--primary-color);
  font-size: 1.3rem;
}

.help-item p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.help-item ul {
  list-style: none;
  padding: 0;
  margin-top: 1rem;
}

.help-item ul li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
}

.help-item ul li:before {
  content: "•";
  color: var(--primary-color);
  position: absolute;
  left: 0;
}

.help-item ul li a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

.help-item ul li a:hover {
  text-decoration: underline;
}

/* Responsive adjustments for help page */
@media (max-width: 768px) {
  .help-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .help-item {
    padding: 1rem;
  }
}