:root {
  --primary-green: #0d5c3a;
  --secondary-teal: #16a085;
  --accent-teal: #0f766e;
  --light-bg: #f4fbf7;
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #475569; /* WCAG 2.1 AA Contrast Compliant (7.1:1) */
  --border-color: #cbd5e1;
  --primary-gradient: linear-gradient(135deg, #0d5c3a 0%, #16a085 100%);
  --shadow-sm: 0 2px 8px rgba(13, 92, 58, 0.08);
  --shadow-lg: 0 12px 28px rgba(13, 92, 58, 0.15);
  --radius-lg: 18px;
  --radius-md: 12px;
  --base-font-scale: 1;
}

/* Accessibility Visually Hidden Utility for Screen Readers (WCAG 4.1.2) */
.visually-hidden {
  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;
}

/* Accessibility Font Size Scaling */
body[data-font-size="large"] {
  --base-font-scale: 1.12;
}

body[data-font-size="xlarge"] {
  --base-font-scale: 1.25;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Prompt', -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--light-bg);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-bottom: 90px;
  font-size: calc(16px * var(--base-font-scale));
}

/* Header & Progress Bar (Centered Logo & No Wrap Fix) */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(13, 92, 58, 0.1);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  max-width: 600px;
  margin: 0 auto;
  gap: 6px;
  flex-wrap: nowrap;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}

.bkk-badge {
  background: var(--primary-gradient);
  color: #fff;
  font-size: calc(0.76rem * var(--base-font-scale));
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 20px;
  white-space: nowrap;
}

.tf-badge {
  color: var(--secondary-teal);
  font-size: calc(0.72rem * var(--base-font-scale));
  font-weight: 600;
  white-space: nowrap;
}

/* Font Size Toggle Buttons */
.font-size-toggle {
  display: flex;
  gap: 2px;
  background: #f1f5f9;
  padding: 2px;
  border-radius: 20px;
  border: 1px solid #cbd5e1;
  flex-shrink: 0;
}

.btn-font-size {
  border: none;
  background: none;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  padding: 2px 7px;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-font-size.active {
  background: var(--primary-green);
  color: #fff;
}

.step-indicator {
  font-size: calc(0.78rem * var(--base-font-scale));
  font-weight: 600;
  color: var(--primary-green);
  background: #e8f5e9;
  padding: 3px 8px;
  border-radius: 12px;
  white-space: nowrap;
  flex-shrink: 0;
}

.progress-container {
  height: 4px;
  background: #e2e8f0;
  width: 100%;
}

.progress-bar {
  height: 100%;
  width: 8%;
  background: var(--primary-gradient);
  transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Main Container & Step Cards */
.app-container {
  flex: 1;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 16px;
}

.step-card {
  display: none;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(13, 92, 58, 0.06);
}

.step-card.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.step-header {
  margin-bottom: 20px;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.question-number {
  font-size: calc(0.78rem * var(--base-font-scale));
  font-weight: 600;
  color: var(--secondary-teal);
  text-transform: uppercase;
}

.badge-required {
  font-size: calc(0.7rem * var(--base-font-scale));
  font-weight: 600;
  color: #dc2626;
  background: #fef2f2;
  border: 1px solid #fca5a5;
  padding: 2px 8px;
  border-radius: 12px;
  white-space: nowrap;
}

.badge-optional {
  font-size: calc(0.7rem * var(--base-font-scale));
  font-weight: 600;
  color: #0284c7;
  background: #f0f9ff;
  border: 1px solid #bae6fd;
  padding: 2px 8px;
  border-radius: 12px;
  white-space: nowrap;
}

.badge-review {
  font-size: calc(0.7rem * var(--base-font-scale));
  font-weight: 600;
  color: var(--primary-green);
  background: #e8f5e9;
  border: 1px solid #a7f3d0;
  padding: 2px 8px;
  border-radius: 12px;
  white-space: nowrap;
}

.step-header h2 {
  font-size: calc(1.18rem * var(--base-font-scale));
  font-weight: 700;
  color: var(--primary-green);
  line-height: 1.4;
  margin-bottom: 6px;
}

.question-desc {
  font-size: calc(0.86rem * var(--base-font-scale));
  color: var(--text-muted);
  line-height: 1.45;
}

/* Option Grid & Touch Cards */
.option-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.option-card, .checkbox-card {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #ffffff;
  border: 2px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 16px 18px;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 56px; /* Touch target minimum size */
  user-select: none;
}

/* Visual Checkbox & Radio Indicators */
.checkbox-card::after, .option-card::after {
  content: '';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  min-width: 26px;
  margin-left: 12px;
  border: 2px solid #94a3b8;
  border-radius: 6px;
  background: #ffffff;
  transition: all 0.2s ease;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

.option-card::after {
  border-radius: 50%;
}

/* Keyboard Focus Outline for Accessibility (WCAG 2.4.7) */
.option-card:focus-within, .checkbox-card:focus-within {
  border-color: var(--secondary-teal);
  box-shadow: 0 0 0 3px rgba(22, 160, 133, 0.2);
}

.card-content {
  display: flex;
  align-items: center;
  gap: 14px;
  width: calc(100% - 38px);
}

.icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}

.label-text {
  font-size: calc(0.95rem * var(--base-font-scale));
  font-weight: 500;
  color: var(--text-main);
  line-height: 1.4;
}

.size-title {
  font-size: calc(0.98rem * var(--base-font-scale));
  font-weight: 700;
  color: var(--primary-green);
}

.size-desc {
  font-size: calc(0.8rem * var(--base-font-scale));
  color: var(--text-muted);
}

.option-card:hover, .checkbox-card:hover {
  border-color: var(--secondary-teal);
  background: #f8fafc;
}

/* Selected State Styles (High Priority) */
.option-card.selected,
.checkbox-card.selected,
.option-card:has(input:checked),
.checkbox-card:has(input:checked) {
  border-color: var(--primary-green) !important;
  background: #e8f5e9 !important;
  box-shadow: 0 4px 14px rgba(13, 92, 58, 0.15) !important;
}

.option-card.selected .label-text,
.checkbox-card.selected .label-text,
.option-card:has(input:checked) .label-text, 
.checkbox-card:has(input:checked) .label-text {
  color: var(--primary-green);
  font-weight: 700;
}

/* Checked Indicator Symbols */
.checkbox-card.selected::after,
.checkbox-card:has(input:checked)::after {
  content: '✓';
  color: #ffffff;
  font-weight: 800;
  font-size: 16px;
  line-height: 1;
  background: var(--primary-green);
  border-color: var(--primary-green);
}

.option-card.selected::after,
.option-card:has(input:checked)::after {
  content: '✓';
  color: #ffffff;
  font-weight: 800;
  font-size: 16px;
  line-height: 1;
  background: var(--primary-green);
  border-color: var(--primary-green);
}

/* Custom Text Inputs, Textarea & BKK Autocomplete */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: calc(0.86rem * var(--base-font-scale));
  font-weight: 600;
  color: var(--primary-green);
}

.label-sub {
  font-size: calc(0.78rem * var(--base-font-scale));
  font-weight: 400;
  color: var(--text-muted);
}

.custom-input, .custom-textarea {
  width: 100%;
  padding: 13px 15px;
  font-size: calc(1rem * var(--base-font-scale));
  border: 2px solid #cbd5e1;
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.2s ease;
  background: #fff;
  color: var(--text-main);
}

.custom-input:focus, .custom-textarea:focus {
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(13, 92, 58, 0.25);
}

/* Autocomplete Dropdown List */
.autocomplete-wrapper {
  position: relative;
  width: 100%;
}

.suggestions-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  border: 2px solid var(--primary-green);
  border-top: none;
  border-bottom-left-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
  max-height: 200px;
  overflow-y: auto;
  z-index: 120;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.suggestion-header {
  padding: 8px 12px;
  font-size: calc(0.76rem * var(--base-font-scale));
  font-weight: 700;
  color: var(--primary-green);
  background: #f0fdf4;
  border-bottom: 1px solid #bbf7d0;
}

.suggestion-item {
  padding: 12px 14px;
  font-size: calc(0.88rem * var(--base-font-scale));
  cursor: pointer;
  border-bottom: 1px solid #f1f5f9;
  transition: background 0.15s ease;
}

.suggestion-item:hover {
  background: #e8f5e9;
  color: var(--primary-green);
  font-weight: 600;
}

.selected-address-tag {
  background: #e8f5e9;
  color: var(--primary-green);
  border: 1px solid #a7f3d0;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: calc(0.88rem * var(--base-font-scale));
  font-weight: 600;
  margin-top: 4px;
}

.geocode-badge {
  background: #f0fdf4;
  color: #15803d;
  border: 1px solid #bbf7d0;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: calc(0.82rem * var(--base-font-scale));
  font-weight: 600;
  margin-bottom: 4px;
}

.field-hint {
  font-size: calc(0.78rem * var(--base-font-scale));
  color: #334155; /* WCAG 2.1 AAA High Contrast */
}

.field-hint.error {
  color: #b91c1c;
  font-weight: 600;
}

.privacy-note {
  font-size: calc(0.78rem * var(--base-font-scale));
  color: #0369a1;
  background: #f0f9ff;
  border: 1px dashed #bae6fd;
  padding: 8px 12px;
  border-radius: 8px;
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.mt-12 {
  margin-top: 12px;
}

.mb-12 {
  margin-bottom: 12px;
}

/* Map Wrapper & Map Actions */
.map-wrapper {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.map-toolbar {
  display: flex;
  gap: 8px;
}

.map-search-input {
  flex: 1;
  font-size: calc(0.88rem * var(--base-font-scale));
  padding: 10px 12px;
}

.btn-map-action {
  background: var(--primary-green);
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
}

.map-action-row {
  display: flex;
  gap: 8px;
}

.btn-location, .btn-fullscreen-map {
  flex: 1;
  padding: 11px;
  border-radius: var(--radius-md);
  font-size: calc(0.85rem * var(--base-font-scale));
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-location {
  background: var(--light-bg);
  border: 2px dashed var(--secondary-teal);
  color: var(--primary-green);
}

.btn-fullscreen-map {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  color: var(--text-main);
}

.btn-location:hover, .btn-fullscreen-map:hover {
  background: #e8f5e9;
  border-color: var(--primary-green);
}

.leaflet-map-container {
  width: 100%;
  height: 230px;
  border-radius: var(--radius-md);
  border: 2px solid #cbd5e1;
  z-index: 10;
  transition: all 0.3s ease;
}

/* Fullscreen Map Mode & Floating Close Button */
.btn-close-fullscreen {
  position: fixed;
  top: 70px;
  right: 20px;
  z-index: 220;
  background: #ffffff;
  color: #dc2626;
  border: 2px solid #dc2626;
  padding: 10px 18px;
  border-radius: 30px;
  font-weight: 700;
  font-size: calc(0.88rem * var(--base-font-scale));
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  transition: transform 0.2s ease;
}

.btn-close-fullscreen:active {
  transform: scale(0.95);
}

.leaflet-map-container.fullscreen {
  position: fixed !important;
  top: 60px;
  left: 10px;
  right: 10px;
  bottom: 80px;
  height: calc(100vh - 140px) !important;
  z-index: 150;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.coords-display {
  font-size: calc(0.82rem * var(--base-font-scale));
  font-weight: 500;
  color: var(--text-muted);
  background: #f1f5f9;
  padding: 8px 12px;
  border-radius: 8px;
  text-align: center;
}

.coords-display.active {
  color: var(--primary-green);
  background: #e8f5e9;
  font-weight: 600;
}

/* Upload Box */
.upload-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.file-input {
  display: none;
}

.upload-label {
  border: 2px dashed #cbd5e1;
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  background: #f8fafc;
  transition: all 0.2s ease;
}

.upload-label:hover {
  border-color: var(--primary-green);
  background: #e8f5e9;
}

.upload-icon {
  font-size: 2rem;
  margin-bottom: 6px;
}

.upload-sub {
  display: block;
  font-size: calc(0.75rem * var(--base-font-scale));
  color: var(--text-muted);
  margin-top: 4px;
}

.file-preview-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.file-thumb {
  width: 65px;
  height: 65px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--border-color);
}

/* UX Structured Review Cards */
.review-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.review-section-card {
  background: #f8fafc;
  border-radius: var(--radius-md);
  padding: 16px;
  border: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.review-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 8px;
}

.review-card-title {
  font-size: calc(0.92rem * var(--base-font-scale));
  font-weight: 700;
  color: var(--primary-green);
  display: flex;
  align-items: center;
  gap: 6px;
}

.review-edit-btn {
  background: none;
  border: none;
  color: var(--secondary-teal);
  font-size: calc(0.78rem * var(--base-font-scale));
  font-weight: 600;
  cursor: pointer;
}

.review-data-row {
  display: flex;
  justify-content: space-between;
  font-size: calc(0.85rem * var(--base-font-scale));
}

.review-label {
  color: var(--text-muted);
}

.review-value {
  color: var(--text-main);
  font-weight: 600;
  text-align: right;
  max-width: 60%;
}

/* Bottom Footer Actions */
.action-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  max-width: 600px;
  margin: 0 auto;
  z-index: 90;
}

.btn-primary, .btn-secondary {
  flex: 1;
  padding: 14px;
  border-radius: var(--radius-md);
  font-size: calc(1rem * var(--base-font-scale));
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  text-align: center;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: 0 4px 14px rgba(13, 92, 58, 0.25);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  background: #cbd5e1;
  color: #64748b;
  box-shadow: none;
  cursor: not-allowed;
}

.btn-secondary {
  background: #f1f5f9;
  color: var(--text-main);
  border: 1px solid #cbd5e1;
}

.btn-full {
  width: 100%;
}

/* Modal Popup */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-backdrop.active {
  display: flex;
}

.modal-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 26px;
  max-width: 480px;
  width: 100%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-icon {
  font-size: 2.8rem;
  text-align: center;
}

.modal-card h3 {
  font-size: calc(1.2rem * var(--base-font-scale));
  color: var(--primary-green);
  text-align: center;
}

.modal-card p {
  font-size: calc(0.86rem * var(--base-font-scale));
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
}

.payload-preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: calc(0.78rem * var(--base-font-scale));
  font-weight: 600;
  color: var(--text-muted);
}

.btn-copy {
  background: var(--light-bg);
  border: 1px solid var(--secondary-teal);
  color: var(--primary-green);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: calc(0.75rem * var(--base-font-scale));
  cursor: pointer;
}

.payload-json {
  background: #0f172a;
  color: #38bdf8;
  font-family: monospace;
  font-size: calc(0.75rem * var(--base-font-scale));
  padding: 12px;
  border-radius: 8px;
  max-height: 170px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}