/* ============================================================
   Conservation Mapping Standards Web App
   Design System: ZSL Institute of Zoology + PNAS Figure Style
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* --- Custom Properties (Design Tokens) --- */
:root {
  /* ZSL Palette */
  --zsl-green-dark: #1B4332;
  --zsl-green: #2D6A4F;
  --zsl-green-mid: #40916C;
  --zsl-green-light: #52B788;
  --zsl-green-pale: #95D5B2;
  --zsl-green-wash: #D8F3DC;
  --zsl-navy: #1B263B;
  --zsl-navy-light: #2C3E5A;
  --zsl-grey: #6B7280;
  --zsl-grey-light: #9BA4B5;
  --zsl-grey-pale: #E5E7EB;
  --zsl-gold: #D4A843;
  --zsl-gold-light: #F0D78C;

  /* PNAS Figure Colors — colorblind-friendly, muted */
  --pnas-blue: #4477AA;
  --pnas-cyan: #66CCEE;
  --pnas-green: #228833;
  --pnas-yellow: #CCBB44;
  --pnas-red: #EE6677;
  --pnas-purple: #AA3377;
  --pnas-grey: #BBBBBB;

  /* Land cover class palette */
  --class-dense-forest: #1A5E2A;
  --class-open-forest: #6AAF4C;
  --class-grassland: #C8D96F;
  --class-water: #2F7ABF;
  --class-bare-soil: #C4956A;

  /* Semantic */
  --bg-primary: #FAFBFC;
  --bg-card: #FFFFFF;
  --bg-header: var(--zsl-navy);
  --text-primary: #1F2937;
  --text-secondary: #4B5563;
  --text-muted: #9CA3AF;
  --text-inverse: #F9FAFB;
  --border-light: #E5E7EB;
  --border-medium: #D1D5DB;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.03);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.9375rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.375rem;
  --font-size-2xl: 1.75rem;
  --font-size-3xl: 2.25rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Layout */
  --max-width: 1200px;
  --border-radius: 6px;
  --border-radius-lg: 10px;
  --transition: 150ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* --- Header --- */
.site-header {
  background: var(--bg-header);
  color: var(--text-inverse);
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.site-header__logo {
  width: 36px;
  height: 36px;
  background: var(--zsl-green-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-sm);
  color: var(--zsl-navy);
  flex-shrink: 0;
}

.site-header__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.site-header__subtitle {
  font-size: var(--font-size-xs);
  color: var(--zsl-grey-light);
  font-weight: 400;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* --- Hero Section --- */
.hero {
  background: linear-gradient(135deg, var(--zsl-green-dark) 0%, var(--zsl-green) 50%, var(--zsl-green-mid) 100%);
  color: var(--text-inverse);
  padding: var(--space-12) var(--space-6);
  text-align: center;
}

.hero__title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.hero__desc {
  font-size: var(--font-size-lg);
  max-width: 720px;
  margin: 0 auto var(--space-6);
  opacity: 0.9;
  line-height: 1.7;
}

/* --- Mode Toggle --- */
.mode-toggle {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin: var(--space-8) auto;
  max-width: 500px;
  background: var(--bg-card);
  border-radius: var(--border-radius-lg);
  padding: var(--space-1);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}

.mode-toggle__btn {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: none;
  border-radius: var(--border-radius);
  background: transparent;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.mode-toggle__btn:hover {
  color: var(--text-primary);
  background: var(--zsl-green-wash);
}

.mode-toggle__btn.active {
  background: var(--zsl-green);
  color: white;
  box-shadow: var(--shadow-sm);
}

/* --- Main Content --- */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-6);
}

/* --- Step Panels --- */
.step-panel {
  background: var(--bg-card);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-light);
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

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

.step-panel__header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  user-select: none;
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.step-panel__header:hover {
  background: var(--zsl-green-wash);
}

.step-panel.open .step-panel__header {
  border-bottom-color: var(--border-light);
}

.step-panel__number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--zsl-green-pale);
  color: var(--zsl-green-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-sm);
  flex-shrink: 0;
  transition: all var(--transition);
}

.step-panel.open .step-panel__number {
  background: var(--zsl-green);
  color: white;
}

.step-panel.completed .step-panel__number {
  background: var(--zsl-green-dark);
  color: white;
}

.step-panel__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

.step-panel__badge {
  font-size: var(--font-size-xs);
  padding: var(--space-1) var(--space-3);
  border-radius: 20px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.step-panel__badge--pending {
  background: var(--zsl-grey-pale);
  color: var(--zsl-grey);
}

.step-panel__badge--running {
  background: #FEF3C7;
  color: #92400E;
  animation: pulse-badge 2s infinite;
}

.step-panel__badge--done {
  background: var(--zsl-green-wash);
  color: var(--zsl-green-dark);
}

@keyframes pulse-badge {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.step-panel__chevron {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.step-panel.open .step-panel__chevron {
  transform: rotate(180deg);
}

.step-panel__body {
  padding: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 300ms ease, padding 300ms ease;
}

.step-panel.open .step-panel__body {
  padding: var(--space-6);
  max-height: 5000px;
}

/* --- Step Body Layouts --- */
.step-description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  line-height: 1.7;
  max-width: 680px;
}

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

.step-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: flex-end;
  margin-bottom: var(--space-6);
}

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

.control-group label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.control-group input,
.control-group select {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border-medium);
  border-radius: var(--border-radius);
  background: var(--bg-card);
  color: var(--text-primary);
  min-width: 120px;
  transition: border-color var(--transition);
}

.control-group input:focus,
.control-group select:focus {
  outline: none;
  border-color: var(--zsl-green-light);
  box-shadow: 0 0 0 3px rgba(82, 183, 136, 0.15);
}

/* --- Buttons --- */
.btn {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--zsl-green);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--zsl-green-dark);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--zsl-green-wash);
  border-color: var(--zsl-green-pale);
}

.btn-gold {
  background: var(--zsl-gold);
  color: var(--zsl-navy);
}

.btn-gold:hover:not(:disabled) {
  background: #C49B3A;
  box-shadow: var(--shadow-md);
}

/* --- Viz Grids --- */
.viz-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.viz-grid--2 { grid-template-columns: 1fr 1fr; }
.viz-grid--3 { grid-template-columns: 1fr 1fr 1fr; }
.viz-grid--2-1 { grid-template-columns: 2fr 1fr; }

@media (max-width: 768px) {
  .viz-grid--2, .viz-grid--3, .viz-grid--2-1 {
    grid-template-columns: 1fr;
  }
}

/* --- PNAS Figure Container --- */
.figure-container {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  padding: var(--space-4);
  position: relative;
}

.figure-container__title {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--border-light);
}

.figure-container canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Raster canvas specific */
.raster-canvas-wrap {
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius);
  background: #F3F4F6;
  aspect-ratio: 1;
}

.raster-canvas-wrap canvas {
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
}

/* Color bar */
.color-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.color-bar__gradient {
  height: 12px;
  flex: 1;
  border-radius: 2px;
  border: 1px solid var(--border-light);
}

/* Discrete legend */
.discrete-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.discrete-legend__item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.discrete-legend__swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  border: 1px solid rgba(0,0,0,0.1);
}

/* --- Progress Bar --- */
.progress-container {
  margin: var(--space-4) 0;
}

.progress-bar {
  height: 8px;
  background: var(--zsl-grey-pale);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--zsl-green-light), var(--zsl-green));
  border-radius: 4px;
  transition: width 200ms ease;
  width: 0%;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* --- Stats Cards --- */
.stats-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: var(--space-4) 0;
}

.stat-card {
  flex: 1;
  min-width: 140px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  padding: var(--space-3) var(--space-4);
  text-align: center;
}

.stat-card__label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.stat-card__value {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--zsl-green-dark);
  margin-top: var(--space-1);
}

.stat-card__ci {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

/* Threshold indicator */
.stat-card--pass { border-left: 3px solid var(--zsl-green); }
.stat-card--warn { border-left: 3px solid var(--zsl-gold); }
.stat-card--fail { border-left: 3px solid var(--pnas-red); }

/* --- Confusion Matrix Table --- */
.confusion-matrix {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-xs);
  margin-top: var(--space-3);
}

.confusion-matrix th,
.confusion-matrix td {
  padding: var(--space-2) var(--space-3);
  text-align: center;
  border: 1px solid var(--border-light);
}

.confusion-matrix th {
  background: var(--zsl-green-wash);
  font-weight: 600;
  color: var(--text-primary);
}

.confusion-matrix td {
  font-variant-numeric: tabular-nums;
}

.confusion-matrix .diag {
  background: rgba(45, 106, 79, 0.1);
  font-weight: 600;
}

/* --- Info Alert --- */
.info-alert {
  background: var(--zsl-green-wash);
  border-left: 3px solid var(--zsl-green);
  padding: var(--space-3) var(--space-4);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: var(--space-4) 0;
}

.info-alert strong {
  color: var(--zsl-green-dark);
}

/* --- Checklist Table (for Table 1 reference) --- */
.checklist-summary {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-3);
  background: var(--zsl-green-wash);
  border-radius: var(--border-radius);
  margin-top: var(--space-2);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.checklist-summary .check {
  color: var(--zsl-green);
  font-weight: 700;
}

/* --- Footer --- */
.site-footer {
  background: var(--zsl-navy);
  color: var(--zsl-grey-light);
  padding: var(--space-8) var(--space-6);
  text-align: center;
  font-size: var(--font-size-xs);
  margin-top: var(--space-12);
}

.site-footer a {
  color: var(--zsl-green-light);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.site-footer__line {
  margin-top: var(--space-2);
  opacity: 0.7;
}

/* --- Chart.js PNAS Overrides --- */
.chart-wrap {
  position: relative;
  width: 100%;
  max-height: 360px;
}

.chart-wrap canvas {
  max-height: 360px;
}

/* --- Utility Classes --- */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-4 { margin-bottom: var(--space-4); }
.hidden { display: none !important; }

/* --- Loading spinner --- */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .hero { padding: var(--space-8) var(--space-4); }
  .hero__title { font-size: var(--font-size-2xl); }
  .main-content { padding: var(--space-4); }
  .step-panel__body { padding: var(--space-4); }
  .step-controls { flex-direction: column; }
  .stats-row { flex-direction: column; }
}