/* ==========================================================================
   Fife ShieldBelt Calculator — Design System
   Nature Finance Certification Alliance (NFCA)
   ========================================================================== */

/* --------------------------------------------------------------------------
   Google Fonts are loaded in index.html — Playfair Display, Source Sans 3
   -------------------------------------------------------------------------- */

/* ==========================================================================
   1. CSS Custom Properties
   ========================================================================== */

:root {
  /* NFCA Brand Colours */
  --c-forest:   #1a3d2b;
  --c-negative: #9b2226;   /* costs / income foregone */
  --c-mid:      #2d6a4f;
  --c-leaf:     #52b788;
  --c-gold:     #b5830a;
  --c-gold-lt:  #f4c542;
  --c-cream:    #faf7f0;
  --c-stone:    #e8e4dc;
  --c-ink:      #1c1c1c;
  --c-muted:    #6b7280;

  /* Width colour coding */
  --c-w3m:   #1d4ed8;
  --c-w6m:   #15803d;
  --c-w12m:  #a16207;
  --c-w20m:  #9d174d;

  /* Typography */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Source Sans 3', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Mono', monospace;

  /* Spacing scale */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Border radius */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(26,61,43,0.08), 0 1px 2px rgba(26,61,43,0.05);
  --shadow-md:  0 4px 12px rgba(26,61,43,0.10), 0 2px 4px rgba(26,61,43,0.06);
  --shadow-lg:  0 10px 30px rgba(26,61,43,0.14), 0 4px 10px rgba(26,61,43,0.08);

  /* Layout */
  --panel-left-width: 380px;
  --content-max:      1200px;
  --header-height:    60px;

  /* Transitions */
  --transition-fast: 120ms ease;
  --transition-mid:  220ms ease;
}

/* ==========================================================================
   2. Reset & Base
   ========================================================================== */

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

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

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--c-ink);
  background-color: var(--c-cream);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-forest);
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.375rem; }
h3 { font-size: 1.125rem; font-weight: 600; }
h4 { font-size: 0.9375rem; font-weight: 600; }

p { color: var(--c-ink); }

a {
  color: var(--c-mid);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--c-leaf); }

ul, ol { list-style: none; }

img, svg { display: block; max-width: 100%; }

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

input, select, textarea {
  font-family: var(--font-body);
  font-size: inherit;
}

/* ==========================================================================
   3. Layout
   ========================================================================== */

.app-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

.app-main {
  flex: 1;
  display: flex;
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-6) var(--space-5);
  gap: var(--space-6);
  align-items: flex-start;
}

/* Left control panel */
.panel-left {
  width: var(--panel-left-width);
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--header-height) + var(--space-5));
  max-height: calc(100dvh - var(--header-height) - var(--space-10));
  overflow-y: auto;
  border-left: 3px solid var(--c-forest);
  padding-left: var(--space-5);
  scrollbar-width: thin;
  scrollbar-color: var(--c-stone) transparent;
}

.panel-left::-webkit-scrollbar {
  width: 4px;
}
.panel-left::-webkit-scrollbar-track {
  background: transparent;
}
.panel-left::-webkit-scrollbar-thumb {
  background: var(--c-stone);
  border-radius: var(--radius-pill);
}

/* Right results panel */
.panel-right {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

/* ==========================================================================
   4. Header
   ========================================================================== */

.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--c-forest);
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}

.app-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
  height: 100%;
  gap: var(--space-4);
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.app-header__logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--c-gold-lt);
  letter-spacing: 0.08em;
  background: rgba(244,197,66,0.12);
  border: 1.5px solid var(--c-gold-lt);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  line-height: 1.4;
  flex-shrink: 0;
}

.app-header__title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  color: #e8f5ee;
  line-height: 1.3;
}

.app-header__title span {
  display: block;
  font-size: 0.75rem;
  font-weight: 300;
  color: var(--c-leaf);
  letter-spacing: 0.03em;
}

.app-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.app-header__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-gold-lt);
  border: 1.5px solid rgba(244,197,66,0.35);
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.app-header__link:hover {
  background: rgba(244,197,66,0.12);
  border-color: var(--c-gold-lt);
  color: var(--c-gold-lt);
}

/* ==========================================================================
   5. Card
   ========================================================================== */

.card {
  background: #ffffff;
  border: 1px solid var(--c-stone);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
  transition: box-shadow var(--transition-mid);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card--flat {
  box-shadow: none;
}

.card--accent {
  border-left: 3px solid var(--c-leaf);
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--c-stone);
}

.card__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-forest);
}

/* ==========================================================================
   6. Accordion / Collapsible Step
   ========================================================================== */

.step-accordion {
  border: 1px solid var(--c-stone);
  border-radius: var(--radius-md);
  background: #fff;
  overflow: hidden;
  margin-bottom: var(--space-3);
  transition: box-shadow var(--transition-mid);
}

.step-accordion:has(.step-accordion__body:not([hidden])) {
  box-shadow: var(--shadow-md);
  border-color: var(--c-leaf);
}

.step-accordion__trigger {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background var(--transition-fast);
}

.step-accordion__trigger:hover {
  background: rgba(82,183,136,0.06);
}

.step-accordion__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--c-stone);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--c-forest);
  flex-shrink: 0;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.step-accordion--complete .step-accordion__number {
  background: var(--c-leaf);
  color: #fff;
}

.step-accordion--active .step-accordion__number {
  background: var(--c-forest);
  color: var(--c-gold-lt);
}

.step-accordion__label {
  flex: 1;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-forest);
}

.step-accordion__summary {
  font-size: 0.75rem;
  color: var(--c-muted);
  font-weight: 400;
}

.step-accordion__chevron {
  color: var(--c-muted);
  transition: transform var(--transition-mid);
  flex-shrink: 0;
}

.step-accordion__trigger[aria-expanded="true"] .step-accordion__chevron {
  transform: rotate(180deg);
}

.step-accordion__body {
  padding: var(--space-4);
  border-top: 1px solid var(--c-stone);
  background: var(--c-cream);
}

.step-accordion__body[hidden] {
  display: none;
}

/* ==========================================================================
   7. Form Controls
   ========================================================================== */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.form-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-forest);
  letter-spacing: 0.01em;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--c-muted);
  line-height: 1.4;
}

.form-input {
  height: 40px;
  padding: 0 var(--space-3);
  border: 1.5px solid var(--c-stone);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

.form-input:focus {
  outline: none;
  border-color: var(--c-leaf);
  box-shadow: 0 0 0 3px rgba(82,183,136,0.18);
}

.form-input--unit {
  display: flex;
  align-items: center;
  position: relative;
}

.form-input--unit input {
  padding-right: 44px;
}

.form-input--unit__suffix {
  position: absolute;
  right: 12px;
  font-size: 0.8125rem;
  color: var(--c-muted);
  font-family: var(--font-body);
  pointer-events: none;
}

/* Slider */
.form-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--c-stone);
  outline: none;
  cursor: pointer;
}

.form-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--c-gold);
  border: 2px solid #fff;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.form-slider::-webkit-slider-thumb:hover {
  background: var(--c-gold-lt);
  transform: scale(1.15);
}

.form-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--c-gold);
  border: 2px solid #fff;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.slider-value {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-gold);
  min-width: 70px;
  text-align: right;
}

/* Radio group */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.radio-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1.5px solid var(--c-stone);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.radio-option:hover {
  border-color: var(--c-leaf);
  background: rgba(82,183,136,0.04);
}

.radio-option input[type="radio"] {
  margin-top: 2px;
  accent-color: var(--c-forest);
  flex-shrink: 0;
}

.radio-option input[type="radio"]:checked + .radio-option__content .radio-option__label {
  color: var(--c-forest);
}

.radio-option:has(input:checked) {
  border-color: var(--c-forest);
  background: rgba(26,61,43,0.04);
}

.radio-option__label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-ink);
  display: block;
}

.radio-option__desc {
  font-size: 0.75rem;
  color: var(--c-muted);
  line-height: 1.4;
}

/* ==========================================================================
   8. Biome Selector Grid
   ========================================================================== */

.biome-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.biome-card {
  border: 1.5px solid var(--c-stone);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  background: #fff;
  position: relative;
}

.biome-card:hover {
  border-color: var(--c-leaf);
  box-shadow: var(--shadow-sm);
}

.biome-card--selected,
.biome-card:has(input:checked) {
  border-color: var(--c-forest);
  background: rgba(26,61,43,0.04);
  box-shadow: var(--shadow-md);
}

.biome-card input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.biome-card__icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-1);
  line-height: 1;
}

.biome-card__name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-forest);
  line-height: 1.3;
}

.biome-card__desc {
  font-size: 0.6875rem;
  color: var(--c-muted);
  margin-top: 2px;
}

/* ==========================================================================
   9. Badge — Width Coding
   ========================================================================== */

.badge-width {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: #fff;
}

.badge-width[data-width="3m"]  { background: var(--c-w3m); }
.badge-width[data-width="6m"]  { background: var(--c-w6m); }
.badge-width[data-width="12m"] { background: var(--c-w12m); }
.badge-width[data-width="20m"] { background: var(--c-w20m); }

/* ==========================================================================
   10. Biome Tag
   ========================================================================== */

.biome-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--c-forest);
  color: var(--c-cream);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.5;
  white-space: nowrap;
}

.biome-tag--light {
  background: rgba(26,61,43,0.1);
  color: var(--c-forest);
}

/* ==========================================================================
   11. Problem Chip Selector
   ========================================================================== */

.problem-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.problem-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1.5px solid var(--c-stone);
  border-radius: var(--radius-pill);
  background: #fff;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-ink);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  white-space: nowrap;
}

.problem-chip:hover {
  border-color: var(--c-leaf);
  background: rgba(82,183,136,0.07);
  color: var(--c-forest);
}

.problem-chip--selected,
.problem-chip[aria-pressed="true"] {
  border-color: var(--c-forest);
  background: var(--c-forest);
  color: var(--c-cream);
}

.problem-chip__icon {
  font-size: 0.9375rem;
  line-height: 1;
}

/* ==========================================================================
   12. Stat Box — Key Output Metric
   ========================================================================== */

.stat-box {
  background: #fff;
  border: 1px solid var(--c-stone);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-5) var(--space-4);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stat-box__value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  color: var(--c-forest);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.stat-box__value--gold {
  color: var(--c-gold);
}

.stat-box__value--leaf {
  color: var(--c-mid);
}

.stat-box__label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-ink);
  line-height: 1.3;
}

.stat-box__sublabel {
  font-size: 0.6875rem;
  color: var(--c-muted);
  line-height: 1.4;
}

.stat-boxes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-3);
}

/* ==========================================================================
   13. Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 40px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  border: 1.5px solid transparent;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--c-gold);
  color: var(--c-forest);
  border-color: var(--c-gold);
}

.btn-primary:hover:not(:disabled) {
  background: var(--c-gold-lt);
  border-color: var(--c-gold-lt);
  color: var(--c-forest);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-ghost {
  background: transparent;
  color: var(--c-mid);
  border-color: var(--c-mid);
}

.btn-ghost:hover:not(:disabled) {
  background: rgba(45,106,79,0.07);
  color: var(--c-forest);
  border-color: var(--c-forest);
}

.btn-leaf {
  background: var(--c-leaf);
  color: #fff;
  border-color: var(--c-leaf);
}

.btn-leaf:hover:not(:disabled) {
  background: var(--c-mid);
  border-color: var(--c-mid);
}

.btn-sm {
  height: 32px;
  padding: 0 var(--space-3);
  font-size: 0.8125rem;
}

.btn-lg {
  height: 48px;
  padding: 0 var(--space-8);
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

/* ==========================================================================
   14. Progress Bar
   ========================================================================== */

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--c-stone);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: var(--c-leaf);
  border-radius: var(--radius-pill);
  transition: width 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
  min-width: 0;
}

.progress-bar--gold .progress-bar__fill {
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-gold-lt) 100%);
}

.progress-bar--stacked {
  height: 10px;
}

/* Named progress variant with label */
.progress-labeled {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.progress-labeled__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.progress-labeled__name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-ink);
}

.progress-labeled__pct {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-muted);
}

/* ==========================================================================
   15. Results Sections
   ========================================================================== */

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--c-stone);
  margin-bottom: var(--space-4);
}

.results-header__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--c-forest);
}

.results-header__meta {
  font-size: 0.8125rem;
  color: var(--c-muted);
}

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

.results-section__title {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  margin-bottom: var(--space-3);
}

/* Chart placeholder */
.chart-placeholder {
  background: var(--c-stone);
  border-radius: var(--radius-md);
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-muted);
  font-size: 0.8125rem;
  font-style: italic;
}

/* ==========================================================================
   16. Empty / Loading States
   ========================================================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12) var(--space-6);
  text-align: center;
  gap: var(--space-3);
}

.empty-state__icon {
  font-size: 2.5rem;
  opacity: 0.45;
}

.empty-state__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  color: var(--c-forest);
}

.empty-state__body {
  font-size: 0.875rem;
  color: var(--c-muted);
  max-width: 320px;
  line-height: 1.6;
}

/* ==========================================================================
   17. Variant Selector
   ========================================================================== */

.variant-select {
  width: 100%;
  height: 40px;
  padding: 0 var(--space-3);
  border: 1.5px solid var(--c-stone);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: 0.875rem;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 36px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.variant-select:focus {
  outline: none;
  border-color: var(--c-leaf);
  box-shadow: 0 0 0 3px rgba(82,183,136,0.18);
}

.variant-select:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  background-color: var(--c-stone);
}

/* ==========================================================================
   18. Divider
   ========================================================================== */

.divider {
  border: none;
  border-top: 1px solid var(--c-stone);
  margin: var(--space-4) 0;
}

/* ==========================================================================
   19. Footer
   ========================================================================== */

.app-footer {
  background: var(--c-forest);
  color: rgba(232,245,238,0.7);
  text-align: center;
  padding: var(--space-5) var(--space-5);
  font-size: 0.8125rem;
  line-height: 1.6;
}

.app-footer strong {
  color: var(--c-gold-lt);
  font-weight: 600;
}

.app-footer a {
  color: var(--c-leaf);
}

.app-footer a:hover {
  color: var(--c-gold-lt);
}

.app-footer__dots {
  margin: 0 6px;
  opacity: 0.45;
}

/* ==========================================================================
   20. Utility Classes
   ========================================================================== */

.text-mono     { font-family: var(--font-mono); }
.text-display  { font-family: var(--font-display); }
.text-muted    { color: var(--c-muted); }
.text-forest   { color: var(--c-forest); }
.text-leaf     { color: var(--c-leaf); }
.text-gold     { color: var(--c-gold); }
.text-sm       { font-size: 0.8125rem; }
.text-xs       { font-size: 0.75rem; }
.text-lg       { font-size: 1.125rem; }
.font-600      { font-weight: 600; }
.font-300      { font-weight: 300; }

.mt-2  { margin-top: var(--space-2); }
.mt-3  { margin-top: var(--space-3); }
.mt-4  { margin-top: var(--space-4); }
.mt-6  { margin-top: var(--space-6); }
.mb-2  { margin-bottom: var(--space-2); }
.mb-3  { margin-bottom: var(--space-3); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }

.flex           { display: flex; }
.flex-col       { flex-direction: column; }
.items-center   { align-items: center; }
.justify-between{ justify-content: space-between; }
.gap-2          { gap: var(--space-2); }
.gap-3          { gap: var(--space-3); }
.gap-4          { gap: var(--space-4); }
.flex-1         { flex: 1; }
.flex-wrap      { flex-wrap: wrap; }

.hidden   { display: none !important; }
.sr-only  {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   21. Responsive — Mobile ≤ 768px
   ========================================================================== */

@media (max-width: 768px) {
  .app-main {
    flex-direction: column;
    padding: var(--space-4) var(--space-4);
    gap: var(--space-4);
  }

  .panel-left {
    width: 100%;
    position: static;
    max-height: none;
    overflow-y: visible;
    border-left: none;
    border-top: 3px solid var(--c-forest);
    padding-left: 0;
    padding-top: var(--space-4);
  }

  .app-header__title span {
    display: none;
  }

  .app-header__link {
    font-size: 0.75rem;
    padding: 4px 10px;
  }

  .stat-boxes-grid {
    grid-template-columns: 1fr 1fr;
  }

  .biome-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .biome-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stat-boxes-grid {
    grid-template-columns: 1fr;
  }

  .app-header__logo {
    display: none;
  }
}

/* ==========================================================================
   22. Print
   ========================================================================== */

/* ==========================================================================
   23. Loading Screen
   ========================================================================== */

#loading-screen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--c-forest);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.35s ease;
}

.loading-screen__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  color: var(--c-cream);
}

.loading-screen__logo {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--c-gold-lt);
  letter-spacing: 0.1em;
  animation: pulse 1.6s ease-in-out infinite;
}

.loading-screen__title {
  font-size: 1rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  color: var(--c-leaf);
}

.loading-screen__spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(82,183,136,0.25);
  border-top-color: var(--c-leaf);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

.loading-screen__msg {
  font-size: 0.8125rem;
  color: rgba(250,247,240,0.55);
}

@keyframes spin  { to { transform: rotate(360deg); } }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.55; } }

/* ==========================================================================
   24. Problem Panel
   ========================================================================== */

.problem-panel {
  border-left: 3px solid var(--c-gold);
  background: #fff;
}

.problem-panel__head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.problem-panel__icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  line-height: 1.2;
}

.problem-panel__code {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--c-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.problem-panel__symptom {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-forest);
  line-height: 1.3;
}

.problem-panel__section-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  margin: var(--space-4) 0 var(--space-2);
}

.problem-panel__recommendation {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--c-ink);
  padding: var(--space-3);
  background: var(--c-cream);
  border-radius: var(--radius-md);
}

/* Farmer diagnosis blockquote */
.problem-diagnosis {
  font-family: 'Playfair Display', Georgia, serif;
  font-style: italic;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-forest);
  border-left: 3px solid var(--c-gold);
  background: var(--c-cream);
  padding: var(--space-4);
  margin: 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* 5-point solution map */
.solution-map {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.solution-map__row {
  display: grid;
  grid-template-columns: 24px 110px 1fr;
  gap: var(--space-2);
  align-items: baseline;
  padding: var(--space-2) var(--space-3);
  background: var(--c-cream);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
}

.solution-map__icon {
  font-size: 0.875rem;
  line-height: 1.4;
}

.solution-map__label {
  font-weight: 600;
  color: var(--c-forest);
  font-size: 0.8125rem;
}

.solution-map__text {
  color: var(--c-ink);
  line-height: 1.5;
}

/* Linked solution pills */
.solution-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.solution-pill {
  display: inline-block;
  padding: 3px 10px;
  background: var(--c-stone);
  color: var(--c-forest);
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: help;
  white-space: nowrap;
}

/* ==========================================================================
   25. Problem chip category headers
   ========================================================================== */

.problem-category-header {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--c-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: var(--space-4) 0 var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--c-stone);
  width: 100%;
}

.problem-category-header:first-child {
  margin-top: 0;
}

.problem-chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
}

/* ==========================================================================
   26. CREW / Pest chips grid
   ========================================================================== */

.crew-chips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.crew-chip {
  background: var(--c-cream);
  border: 1px solid var(--c-stone);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.crew-chip__value {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-mid);
  line-height: 1.2;
}

.crew-chip__label {
  font-size: 0.6875rem;
  color: var(--c-muted);
  margin-top: 2px;
  line-height: 1.3;
}

/* ==========================================================================
   27. Segmented toggle (placement / windbreak orientation)
   ========================================================================== */

.seg-toggle {
  display: inline-flex;
  border: 1.5px solid var(--c-stone);
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
}

.seg-toggle__btn {
  padding: 4px 12px;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--c-muted);
  background: #fff;
  border: none;
  border-right: 1.5px solid var(--c-stone);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.seg-toggle__btn:last-child {
  border-right: none;
}

.seg-toggle__btn.active,
.seg-toggle__btn[aria-pressed="true"] {
  background: var(--c-forest);
  color: var(--c-cream);
}

.seg-toggle__btn:hover:not(.active) {
  background: rgba(26,61,43,0.06);
  color: var(--c-forest);
}

/* ==========================================================================
   28. Results section body flex
   ========================================================================== */

.results-section-body {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  align-items: flex-start;
  margin-top: var(--space-3);
}

/* Keep radar canvases from growing beyond 300px */
#chart-water-radar,
#chart-eco-radar {
  flex-shrink: 0;
  max-width: 300px;
}

/* Finance and avoided-cost charts need full width */
#chart-finance-bar,
#chart-avoided-costs,
#chart-windbreak,
#chart-carbon,
#chart-modal-compare {
  width: 100%;
  display: block;
}

/* ============================================================================
   PRINT
   ============================================================================ */

.print-header { display: none; }

@media print {
  .app-header,
  .panel-left,
  .app-footer,
  .export-panel,
  .problem-chips,
  .biome-selector,
  .seg-toggle,
  #btn-mobile-drawer,
  .drawer-backdrop,
  dialog { display: none !important; }

  .app-main  { display: block; padding: 0; }
  .panel-right { width: 100% !important; margin: 0 !important; }

  .print-header {
    display: block !important;
    font-family: var(--font-display);
    color: var(--c-forest);
    border-bottom: 2px solid var(--c-forest);
    padding-bottom: 8px;
    margin-bottom: 16px;
  }
  .print-header::before {
    content: "Fife ShieldBelt Calculator — NFCA · natcert.earth · " attr(data-date);
    font-size: 11pt;
  }

  .card,
  .result-card,
  .stat-box { break-inside: avoid; page-break-inside: avoid; }

  canvas { max-width: 100%; }

  @page { size: A4 portrait; margin: 15mm; }
}

/* ============================================================================
   STAT BOX FLASH ANIMATION
   ============================================================================ */

@keyframes stat-flash {
  0%   { background-color: var(--c-bg); }
  40%  { background-color: var(--c-leaf); }
  100% { background-color: var(--c-bg); }
}

.stat-box--flash {
  animation: stat-flash 300ms ease-out forwards;
}

/* ============================================================================
   MOBILE DRAWER
   ============================================================================ */

.mobile-drawer-trigger {
  display: none;
}

.panel-left__header-mobile {
  display: none;
}

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 299;
}

@media (max-width: 767px) {
  .mobile-drawer-trigger {
    display: block;
    position: fixed;
    bottom: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 200;
    min-width: 180px;
    text-align: center;
    box-shadow: 0 4px 16px rgba(0,0,0,0.25);
  }

  .panel-left {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80vh;
    background: var(--c-bg);
    border-top: 3px solid var(--c-forest);
    border-radius: 16px 16px 0 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    transform: translateY(105%);
    transition: transform 280ms cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 300;
    padding: 0 0 2rem;
  }

  .panel-left.drawer-open {
    transform: translateY(0);
  }

  .panel-left__header-mobile {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem 0.75rem;
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--c-forest);
    font-size: 1rem;
    border-bottom: 1px solid var(--c-stone);
    margin-bottom: 0.5rem;
    position: sticky;
    top: 0;
    background: var(--c-bg);
    z-index: 1;
  }

  .panel-left__header-mobile button {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--c-muted);
    cursor: pointer;
    padding: 4px 8px;
  }
}

/* ============================================================================
   BIOME CONTEXT CARD
   ============================================================================ */

.biome-context-card {
  background: linear-gradient(135deg, var(--c-forest) 0%, #2a5c45 100%);
  color: var(--c-cream);
  border-radius: 10px;
  padding: 0.875rem 1rem;
  margin-bottom: 0.875rem;
}

.biome-context-card__tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.875rem;
  color: var(--c-gold-lt);
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.biome-context-card__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.85);
}

.biome-context-card__stats strong { color: var(--c-gold-lt); }
.biome-context-card__stats em     { font-style: normal; opacity: 0.7; }

/* ============================================================================
   SAVED SCENARIOS PANEL
   ============================================================================ */

.saved-scenarios-panel {
  margin: 0.75rem 0.5rem 0.5rem;
  border: 1px solid var(--c-stone);
  border-radius: 10px;
  padding: 0.75rem;
  background: var(--c-bg);
}

.saved-scenarios__title {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-forest);
  margin-bottom: 0.5rem;
}

.saved-scenario {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 0.125rem 0.75rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--c-stone);
}
.saved-scenario:last-child { border-bottom: none; }

.saved-scenario__label {
  grid-column: 1; grid-row: 1;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.saved-scenario__meta {
  grid-column: 1; grid-row: 2;
  font-size: 0.75rem;
  color: var(--c-muted);
  font-family: var(--font-mono);
}

.saved-scenario__load {
  grid-column: 2; grid-row: 1 / 3;
  align-self: center;
  font-size: 0.75rem;
  padding: 4px 10px;
  text-decoration: none;
}

/* ============================================================================
   REGISTRY ACCORDION — smooth expand/collapse
   ============================================================================ */

.registry-accordion__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 200ms ease-out;
}

.registry-accordion.is-open .registry-accordion__body {
  max-height: 800px;
}

.registry-accordion__trigger .chevron {
  display: inline-block;
  transition: transform 200ms ease;
}

.registry-accordion.is-open .registry-accordion__trigger .chevron {
  transform: rotate(90deg);
}

/* ============================================================================
   LINKED SOLUTION PILLS (tooltip variant)
   ============================================================================ */

.solution-pill {
  position: relative;
  cursor: default;
}

.solution-pill:hover::after {
  content: "Solutions Directory — coming soon";
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-ink);
  color: #fff;
  font-size: 0.7rem;
  white-space: nowrap;
  padding: 4px 8px;
  border-radius: 4px;
  pointer-events: none;
  z-index: 10;
}

/* ============================================================================
   SSER STAT BOX — width colour via border-color (set by JS)
   ============================================================================ */

#stat-sser-value + .stat-box__label,
.stat-box[data-sser] {
  border-top-color: inherit;
}

/* ============================================================================
   ROBUSTNESS & COMPATIBILITY FIXES (Prompt 8)
   ============================================================================ */

/* FIX [accessibility/1e]: :focus-visible outline for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--c-gold, #b5830a);
  outline-offset: 2px;
}

/* FIX [accessibility/1c]: CSS hex fallbacks for Samsung Internet / older Edge */
/* Applied to critical stat/card surfaces alongside var() declarations */
.stat-box {
  background: #ffffff;
  background: var(--c-bg, #ffffff);
  border-color: #e8e4dc;
  border-color: var(--c-stone, #e8e4dc);
}

.stat-box__value {
  color: #1a3d2b;
  color: var(--c-forest, #1a3d2b);
}

.stat-box__label {
  color: #1c1c1c;
  color: var(--c-ink, #1c1c1c);
}

.stat-box__sublabel {
  color: #6b7280;
  color: var(--c-muted, #6b7280);
}

/* FIX [ux/section5c]: negative net benefit — red stat box */
.stat-box--negative {
  border-color: #9b2226;
  border-color: var(--c-negative, #9b2226);
  border-width: 2px;
}

.stat-box--negative .stat-box__value {
  color: #9b2226;
  color: var(--c-negative, #9b2226);
}

/* FIX [mobile/2b]: minimum touch target height for problem chips */
.problem-chip {
  min-height: 44px;
  padding: 8px 14px;
  touch-action: manipulation;
}

/* FIX [mobile/2b]: minimum touch target for variant selector */
.variant-select,
select {
  min-height: 44px;
}

/* FIX [mobile/2b]: range slider touch area + larger thumb */
input[type="range"] {
  touch-action: manipulation;
  height: 44px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  width: 24px;
  height: 24px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--c-forest, #1a3d2b);
  border-radius: 50%;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  background: var(--c-forest, #1a3d2b);
  border-radius: 50%;
  border: none;
  cursor: pointer;
}

/* FIX [mobile/2b]: radio button labels — minimum 44px hit area */
.farm-type-grid .farm-type-card,
.biome-card {
  min-height: 44px;
}

/* FIX [mobile/2b]: placement / windbreak toggle button touch area */
.seg-toggle .seg-btn {
  min-height: 44px;
  touch-action: manipulation;
}

/* FIX [accessibility/7b]: accordion chevron tap area */
.step-accordion__trigger {
  min-height: 44px;
}

/* FIX [input-validation/5a]: inline field error display */
.input-error {
  display: block;
  color: #9b2226;
  color: var(--c-negative, #9b2226);
  font-size: 0.8125rem;
  margin-top: 0.25rem;
  font-weight: 600;
}

/* FIX [iOS/4c]: iOS standalone tip banner */
.ios-standalone-tip {
  font-size: 0.75rem;
  background: rgba(181, 131, 10, 0.15);
  color: var(--c-gold, #b5830a);
  padding: 4px 12px;
  border-radius: 20px;
  white-space: nowrap;
}

/* FIX [mobile/2a]: overflow guard for drawer on small screens */
@media (max-width: 767px) {
  .panel-left {
    max-height: 85vh;
  }

  /* Prevent horizontal scroll at any viewport */
  body, .app-wrapper {
    overflow-x: hidden;
  }
}