/* ADR Study Guide — UNICEF-inspired humanitarian theme */
:root {
  --adr-blue: #1CABE2;
  --adr-blue-dark: #374EA2;
  --adr-blue-deep: #233786;
  --adr-warm: #F26A21;
  --adr-warm-soft: #FFE8DC;
  --adr-bg: #F7FBFD;
  --adr-surface: #ffffff;
  --adr-text: #1a1a2e;
  --adr-muted: #5c6b7a;
  --adr-border: #d8e8f0;
  /* Hazard label colours — see data/colors-reference.php (PMS 186/151/109/285/259) */
  --adr-label-red: #C8102E;
  --adr-label-orange: #F58220;
  --adr-label-yellow: #FEDD00;
  --adr-label-blue: #003DA5;
  --adr-label-purple: #9B26B6;
  --adr-radius: 12px;
  --adr-shadow: 0 4px 24px rgba(55, 78, 162, 0.08);
  --adr-font: "Source Sans 3", "Source Sans Pro", system-ui, sans-serif;
  --adr-max: 1100px;
}

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

html { scroll-behavior: smooth; }

body.adr-body {
  margin: 0;
  font-family: var(--adr-font);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--adr-text);
  background: var(--adr-bg);
}

.adr-skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--adr-blue-dark);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
}
.adr-skip:focus { left: 0; }

/* Header */
.adr-header {
  background: linear-gradient(135deg, var(--adr-blue-dark) 0%, var(--adr-blue) 100%);
  color: #fff;
  box-shadow: var(--adr-shadow);
}
.adr-header-inner {
  max-width: var(--adr-max);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.adr-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}
.adr-brand-mark {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 8px;
  background: rgba(255,255,255,0.2);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}
.adr-brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.adr-brand-text strong { font-size: 1.05rem; }
.adr-brand-text small { opacity: 0.85; font-size: 0.75rem; }

.adr-nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: 6px;
  padding: 8px;
  cursor: pointer;
}
.adr-nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
}

.adr-nav {
  max-width: var(--adr-max);
  margin: 0 auto;
  padding: 0 1.25rem 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
}
.adr-nav-link {
  color: #fff;
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  background: rgba(255,255,255,0.12);
  transition: background 0.15s;
}
.adr-nav-link:hover, .adr-nav-link.is-active {
  background: rgba(255,255,255,0.28);
}
.adr-nav-link--parent {
  background: var(--adr-warm);
  margin-left: auto;
}

/* Main */
.adr-main {
  max-width: var(--adr-max);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  min-height: 60vh;
}

.adr-breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  font-size: 0.88rem;
  color: var(--adr-muted);
}
.adr-breadcrumbs li:not(:last-child)::after {
  content: "›";
  margin-left: 0.35rem;
  opacity: 0.6;
}
.adr-breadcrumbs a { color: var(--adr-blue-dark); }

/* Hero */
.adr-hero {
  background: var(--adr-surface);
  border-radius: var(--adr-radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--adr-shadow);
  border-left: 5px solid var(--adr-blue);
}
.adr-badge {
  display: inline-block;
  background: var(--adr-warm-soft);
  color: var(--adr-warm);
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  margin: 0 0 0.75rem;
}
.adr-hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  color: var(--adr-blue-dark);
  line-height: 1.2;
}
.adr-lead { margin: 0; font-size: 1.1rem; color: var(--adr-muted); }
.adr-lead strong { color: var(--adr-text); }

/* Grid cards */
.adr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.adr-card {
  background: var(--adr-surface);
  border-radius: var(--adr-radius);
  padding: 1.25rem;
  box-shadow: var(--adr-shadow);
  border: 1px solid var(--adr-border);
  transition: transform 0.15s, box-shadow 0.15s;
}
.adr-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(55, 78, 162, 0.12);
}
.adr-card h2, .adr-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: var(--adr-blue-dark);
}
.adr-card p { margin: 0 0 0.75rem; color: var(--adr-muted); font-size: 0.95rem; }
.adr-card .adr-btn { margin-top: 0.25rem; }

.adr-btn {
  display: inline-block;
  background: var(--adr-blue);
  color: #fff !important;
  text-decoration: none;
  font-weight: 700;
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-family: inherit;
}
.adr-btn:hover { background: var(--adr-blue-dark); }
.adr-btn--secondary {
  background: transparent;
  color: var(--adr-blue-dark) !important;
  border: 2px solid var(--adr-blue);
}
.adr-btn--secondary:hover { background: rgba(28, 171, 226, 0.1); }

/* Class cards */
.adr-class-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  background: var(--adr-surface);
  border-radius: var(--adr-radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--adr-shadow);
  border: 1px solid var(--adr-border);
}
.adr-class-placard {
  width: 4.5rem;
  height: 4.5rem;
  border: 3px solid #222;
  border-radius: 4px;
  background: var(--adr-placard, var(--adr-blue-dark));
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.adr-class-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--adr-placard-text, #111);
}
.adr-class-body h2 { margin: 0 0 0.5rem; font-size: 1.25rem; color: var(--adr-blue-dark); }
.adr-muted { color: var(--adr-muted); font-size: 0.92rem; }

.adr-details {
  margin-top: 0.75rem;
  border: 1px solid var(--adr-border);
  border-radius: 8px;
  overflow: hidden;
}
.adr-details summary {
  cursor: pointer;
  padding: 0.65rem 1rem;
  background: rgba(28, 171, 226, 0.08);
  font-weight: 600;
  color: var(--adr-blue-dark);
}
.adr-details-body { padding: 0.75rem 1rem; }

/* Sections */
.adr-section {
  background: var(--adr-surface);
  border-radius: var(--adr-radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--adr-shadow);
}
.adr-section h2 {
  margin: 0 0 1rem;
  color: var(--adr-blue-dark);
  font-size: 1.35rem;
  border-bottom: 2px solid var(--adr-blue);
  padding-bottom: 0.35rem;
}
.adr-section ul { padding-left: 1.25rem; }
.adr-section li { margin-bottom: 0.35rem; }

/* Tables */
.adr-table-wrap { overflow-x: auto; margin: 1rem 0; }
.adr-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.adr-table th, .adr-table td {
  border: 1px solid var(--adr-border);
  padding: 0.6rem 0.75rem;
  text-align: left;
}
.adr-table th {
  background: var(--adr-blue-dark);
  color: #fff;
  font-weight: 600;
}
.adr-table tr:nth-child(even) { background: rgba(28, 171, 226, 0.05); }
.adr-table code {
  font-weight: 700;
  color: var(--adr-warm);
}

/* Search */
.adr-search-wrap { position: relative; margin-bottom: 1.5rem; }
.adr-search-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--adr-blue-dark);
}
.adr-search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--adr-border);
  border-radius: var(--adr-radius);
  font-size: 1rem;
  font-family: inherit;
}
.adr-search-input:focus {
  outline: none;
  border-color: var(--adr-blue);
  box-shadow: 0 0 0 3px rgba(28, 171, 226, 0.25);
}
.adr-search-results {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 20;
  background: var(--adr-surface);
  border: 1px solid var(--adr-border);
  border-radius: var(--adr-radius);
  box-shadow: var(--adr-shadow);
  list-style: none;
  margin: 0.25rem 0 0;
  padding: 0.35rem;
  max-height: 280px;
  overflow-y: auto;
}
.adr-search-results a {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--adr-blue-dark);
  text-decoration: none;
  border-radius: 6px;
}
.adr-search-results a:hover { background: rgba(28, 171, 226, 0.1); }

.adr-search-group-label {
  display: block;
  padding: 0.4rem 0.75rem 0.2rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--adr-muted, #5c6b7a);
}
.adr-search-item--bg .adr-search-title { color: var(--adr-warm, #e07a2f); }
.adr-search-link,
.adr-search-expand {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  color: var(--adr-blue-dark);
  text-decoration: none;
  border: none;
  background: none;
  text-align: left;
  font: inherit;
  border-radius: 6px;
  cursor: pointer;
}
.adr-search-link:hover,
.adr-search-expand:hover { background: rgba(28, 171, 226, 0.1); }
.adr-search-title { display: block; font-weight: 600; }
.adr-search-sub {
  display: block;
  font-size: 0.85rem;
  color: var(--adr-muted, #5c6b7a);
  margin-top: 0.15rem;
}
.adr-search-snippet {
  display: block;
  font-size: 0.85rem;
  margin-top: 0.25rem;
  line-height: 1.35;
  color: #334;
}
.adr-search-snippet mark,
.adr-search-title mark,
.adr-search-sub mark {
  background: #fff3cd;
  padding: 0 0.1em;
  border-radius: 2px;
}
.adr-search-expanded {
  padding: 0.5rem 0.75rem 0.75rem 1.25rem;
  font-size: 0.9rem;
  border-left: 3px solid var(--adr-blue);
  margin: 0 0.5rem 0.5rem;
  background: rgba(28, 171, 226, 0.06);
  border-radius: 0 6px 6px 0;
}
.adr-search-meta {
  font-size: 0.8rem;
  color: var(--adr-muted, #5c6b7a);
  margin: 0.5rem 0 0;
}
.adr-search-more a {
  display: block;
  padding: 0.5rem 0.75rem;
  font-weight: 600;
  font-size: 0.9rem;
}
.adr-recent-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}
.adr-recent-chip {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  background: var(--adr-surface);
  border: 1px solid var(--adr-border);
  border-radius: 999px;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--adr-blue-dark);
}
.adr-recent-chip:hover { border-color: var(--adr-blue); }
.adr-example-searches { line-height: 1.8; }

/* Quiz */
.adr-quiz-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
  font-weight: 600;
  color: var(--adr-blue-dark);
}
.adr-quiz-question {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1rem;
}
.adr-quiz-choices { list-style: none; padding: 0; margin: 0 0 1rem; }
.adr-quiz-choices li { margin-bottom: 0.5rem; }
.adr-quiz-choices label {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  border: 2px solid var(--adr-border);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.adr-quiz-choices label:hover { border-color: var(--adr-blue); }
.adr-quiz-choices input { margin-top: 0.2rem; }
.adr-quiz-choices label.is-correct { border-color: #2a9d8f; background: #e8f8f5; }
.adr-quiz-choices label.is-wrong { border-color: #c1121f; background: #fde8ea; }
.adr-quiz-feedback {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  background: rgba(55, 78, 162, 0.08);
}
.adr-quiz-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }

/* Module accordion */
.adr-module-group { margin-bottom: 2rem; }
.adr-module-group > h2 {
  color: var(--adr-blue-dark);
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}
.adr-module-item {
  border: 1px solid var(--adr-border);
  border-radius: var(--adr-radius);
  margin-bottom: 0.5rem;
  background: var(--adr-surface);
}
.adr-module-item summary {
  padding: 0.85rem 1rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--adr-blue-dark);
}
.adr-module-item .adr-module-body {
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--adr-border);
}
.adr-ref {
  display: inline-block;
  font-size: 0.8rem;
  background: var(--adr-blue-dark);
  color: #fff;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-left: 0.5rem;
  font-weight: 600;
}

/* Chapter layout + TOC sidebar */
.adr-chapter-layout {
  display: grid;
  grid-template-columns: minmax(220px, 280px) 1fr;
  gap: 1.5rem;
  max-width: calc(var(--adr-max) + 280px);
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
  align-items: start;
}
.adr-chapter-main { min-width: 0; }
.adr-toc-sidebar {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  background: var(--adr-surface);
  border: 1px solid var(--adr-border);
  border-radius: var(--adr-radius);
  box-shadow: var(--adr-shadow);
  font-size: 0.88rem;
}
.adr-toc-mobile > summary {
  padding: 0.75rem 1rem;
  font-weight: 700;
  color: var(--adr-blue-dark);
  cursor: pointer;
  list-style: none;
}
.adr-toc-nav { padding: 0 0.75rem 0.75rem; }
.adr-toc-vol h3 {
  font-size: 0.85rem;
  color: var(--adr-muted);
  margin: 0.75rem 0 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.adr-toc-part { margin-bottom: 0.35rem; }
.adr-toc-part > summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--adr-blue-dark);
  padding: 0.35rem 0;
}
.adr-toc-part ul {
  list-style: none;
  padding: 0 0 0.5rem 0.75rem;
  margin: 0;
}
.adr-toc-part a {
  display: block;
  padding: 0.2rem 0;
  color: var(--adr-text);
  text-decoration: none;
  line-height: 1.35;
}
.adr-toc-part a:hover,
.adr-toc-part a.is-active { color: var(--adr-blue); font-weight: 600; }
.adr-chapter-links { list-style: none; padding: 0; margin: 0; }
.adr-chapter-links a {
  display: block;
  padding: 0.4rem 0;
  text-decoration: none;
  color: var(--adr-blue-dark);
  border-bottom: 1px solid var(--adr-border);
}
.adr-chapter-links a:hover { color: var(--adr-blue); }
.adr-chapter-section {
  background: var(--adr-surface);
  border: 1px solid var(--adr-border);
  border-radius: var(--adr-radius);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--adr-shadow);
}
.adr-chapter-section h2 {
  font-size: 1.1rem;
  color: var(--adr-blue-dark);
  margin-top: 0;
}
.adr-chapter-body p { margin: 0.5rem 0; }
.adr-hero--compact { padding: 1.25rem; margin-bottom: 1rem; }
.adr-hero--compact h1 { font-size: 1.5rem; }

/* Figures */
.adr-figure {
  background: #fff;
  border: 1px solid var(--adr-border);
  border-radius: var(--adr-radius);
  box-shadow: var(--adr-shadow);
  overflow: hidden;
  margin: 0;
}
.adr-figure-media {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: #fff;
  min-height: 140px;
}
.adr-figure-media img {
  max-width: 100%;
  height: auto;
  display: block;
}
.adr-figure figcaption {
  padding: 0.6rem 0.85rem;
  font-size: 0.82rem;
  color: var(--adr-muted);
  border-top: 1px solid var(--adr-border);
  background: var(--adr-bg);
  line-height: 1.4;
}
.adr-figure-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}
.adr-figure-grid--compact {
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}
.adr-figure--compact .adr-figure-media { min-height: 100px; padding: 0.5rem; }
.adr-figure--inline {
  max-width: 160px;
  display: inline-block;
  vertical-align: top;
  margin: 0 1rem 1rem 0;
}
.adr-table-scroll { overflow-x: auto; }
.adr-table-matrix th,
.adr-table-matrix td {
  text-align: center;
  min-width: 2.2rem;
  font-size: 0.9rem;
}
.adr-cell-ok { background: #e8f8f5; color: #1b6b5f; font-weight: 700; }
.adr-cell-no { background: #fde8ea; color: #9b1c1f; font-weight: 700; }
.adr-cell-cls { background: #fff8e6; color: #8a5a00; font-weight: 700; }
.adr-btn--ghost {
  background: transparent;
  border: 2px solid var(--adr-blue-dark);
  color: var(--adr-blue-dark);
}
.adr-btn--ghost:hover { background: rgba(55, 78, 162, 0.08); }

/* Footer */
.adr-footer {
  background: var(--adr-blue-deep);
  color: rgba(255,255,255,0.9);
  padding: 2rem 1.25rem;
  margin-top: 2rem;
}
.adr-footer-inner { max-width: var(--adr-max); margin: 0 auto; }
.adr-footer a { color: var(--adr-blue); }
.adr-footer-meta { font-size: 0.88rem; opacity: 0.85; }
.adr-footer-copy { font-size: 0.8rem; margin-top: 1rem; }

/* Print */
@media print {
  .adr-header, .adr-footer, .adr-nav, .adr-search-wrap, .adr-quiz-actions, .adr-nav-toggle, .adr-toc-sidebar { display: none !important; }
  .adr-chapter-layout { display: block; padding: 0; }
  .adr-main { max-width: 100%; padding: 0; }
  .adr-hero, .adr-section, .adr-class-card, .adr-card {
    box-shadow: none;
    break-inside: avoid;
    page-break-inside: avoid;
  }
  .adr-details { border: 1px solid #ccc; }
  .adr-details summary { list-style: none; }
  .adr-details-body { display: block !important; }
  body.adr-body { background: #fff; font-size: 11pt; }
  a { color: #000; text-decoration: none; }
  .adr-class-placard { border: 2px solid #000; }
}

@media (max-width: 768px) {
  .adr-nav-toggle { display: flex; }
  .adr-nav {
    display: none;
    flex-direction: column;
    padding-bottom: 1rem;
  }
  .adr-nav.is-open { display: flex; }
  .adr-nav-link--parent { margin-left: 0; }
  .adr-class-card { grid-template-columns: 1fr; }
  .adr-class-placard { width: 3.5rem; height: 3.5rem; }
  .adr-chapter-layout { grid-template-columns: 1fr; }
  .adr-toc-sidebar { position: static; max-height: none; }
}