/**
 * LEYO FGAS — responsive UX layer (RAF/RN palette via rfb-theme.css)
 * Mobile-first · WCAG AA focus · print · touch targets ≥44px
 */

:root {
  --fgas-touch: 44px;
  --fgas-prose-max: 42rem;
  --fgas-content-max: 72rem;
  --fgas-sidebar: 16rem;
  --fgas-space: clamp(1rem, 2.5vw, 1.75rem);
  --fgas-focus: var(--rfb-accent);
  --fgas-focus-offset: 2px;
  /* Section tab accents (WCAG-friendly on RN dark surfaces) */
  --fgas-tab-home: #7eb8e8;
  --fgas-tab-syllabus: #5ec9c9;
  --fgas-tab-guide: #e8c242;
  --fgas-tab-topics: #b48cff;
  --fgas-tab-glossary: #9eb4ff;
  --fgas-tab-exam-prep: #f0a04a;
  --fgas-tab-exam: #f06a62;
  --fgas-tab-quiz: #58aae9;
  --fgas-tab-pressure: #e89a4a;
  --fgas-tab-resources: #6ecf7a;
  --fgas-tab-study-links: #7ed4a8;
  --fgas-tab-progress: #4ec9b0;
  --fgas-tab-search: #c9a0ff;
  --fgas-tab-tools: #5ec9e8;
  --fgas-tab-electrical: #f0c84a;
  --fgas-tab-ev: #6ecf9a;
  --fgas-tab-gasap: #e89a6a;
  --fgas-tab-admin: #9aa8b8;
  --fgas-tab-default: #b8c7d2;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* Skip link */
.fgas-skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 10000;
  padding: 12px 20px;
  background: var(--rfb-primary);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  border-radius: 0 0 var(--rfb-radius) 0;
}
.fgas-skip-link:focus {
  left: 0;
  top: 0;
  width: auto;
  height: auto;
  overflow: visible;
}

/* Focus visible (keyboard) */
.fgas-body :focus { outline: none; }
.fgas-body :focus-visible {
  outline: 3px solid var(--fgas-focus);
  outline-offset: var(--fgas-focus-offset);
}

/* Sticky topbar + hamburger */
.fgas-topbar {
  position: sticky;
  top: 0;
  z-index: 900;
  flex-wrap: nowrap;
  align-items: center;
  gap: 12px;
  padding: 10px clamp(12px, 3vw, 24px);
}
/* Topbar only: brand + optional title + hamburger (no inline tab row) */
.fgas-topbar > .fgas-topbar-row {
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
}
.fgas-nav-toggle-label {
  display: none;
}
.fgas-topbar-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1 1 auto;
  min-width: 0;
}
.fgas-topbar .rfb-logo-link {
  flex: 1 1 auto;
  min-width: 0;
}
.fgas-topbar .rfb-logo-link img {
  width: clamp(52px, 12vw, 72px);
  height: auto;
  aspect-ratio: 1;
}
.fgas-topbar .rfb-logo-link .fgas-brand-logo {
  width: auto;
  height: 48px;
  max-width: 120px;
  aspect-ratio: auto;
}
.fgas-topbar-title {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  border-left: none;
  padding-left: 0;
  font-size: 0.8125rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
@media (min-width: 600px) {
  .fgas-topbar-title {
    font-size: 0.875rem;
    max-width: 18rem;
  }
}

.fgas-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-left: auto;
  min-width: var(--fgas-touch);
  min-height: var(--fgas-touch);
  padding: 8px 14px;
  background: rgba(26, 44, 58, 0.98);
  border: 1px solid rgba(232, 194, 66, 0.55);
  border-radius: var(--rfb-radius);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
  color: var(--rn-white);
  font: inherit;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  flex-shrink: 0;
}
.fgas-nav-toggle-icon {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 20px;
}
.fgas-nav-toggle-icon span {
  display: block;
  height: 3px;
  background: var(--rfb-accent);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}
.fgas-nav-toggle[aria-expanded="true"] .fgas-nav-toggle-icon span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.fgas-nav-toggle[aria-expanded="true"] .fgas-nav-toggle-icon span:nth-child(2) {
  opacity: 0;
}
.fgas-nav-toggle[aria-expanded="true"] .fgas-nav-toggle-icon span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.fgas-nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 940;
  background: rgba(8, 12, 18, 0.72);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s;
}
.fgas-nav-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}
.fgas-nav-backdrop[hidden] {
  display: none;
}
.fgas-nav-backdrop.is-open[hidden] {
  display: block;
}

/* Drawer lives outside .rfb-topbar so fixed positioning is not trapped by backdrop-filter */
.fgas-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 950;
  display: none;
  flex-direction: column;
  gap: 0;
  width: min(20rem, 92vw);
  max-width: 100%;
  height: 100%;
  max-height: 100dvh;
  margin: 0;
  padding: calc(4.5rem + env(safe-area-inset-top, 0px)) 0 calc(1rem + env(safe-area-inset-bottom, 0px));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  background: linear-gradient(180deg, var(--rn-n800) 0%, var(--rn-n900) 100%);
  border-left: 1px solid rgba(232, 194, 66, 0.28);
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.45);
  transform: translateX(100%);
  visibility: hidden;
  pointer-events: none;
  transition: transform 0.22s ease, visibility 0.22s;
}
.fgas-nav-drawer[hidden] {
  display: none !important;
}
.fgas-nav-drawer.is-open {
  display: flex;
  transform: translateX(0);
  visibility: visible;
  pointer-events: auto;
}
.fgas-nav-drawer.is-open[hidden] {
  display: flex !important;
}

.fgas-nav-group {
  margin: 0;
  padding: 0 0 0.75rem;
  border-bottom: 1px solid var(--rfb-border);
}
.fgas-nav-group:last-child {
  border-bottom: none;
}
.fgas-nav-group-label {
  margin: 0;
  padding: 0.85rem 1.1rem 0.45rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rfb-accent);
}
.fgas-nav-group-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 0 0.65rem 0.35rem;
}
.fgas-nav-drawer .fgas-tab {
  min-height: var(--fgas-touch);
  width: 100%;
  justify-content: flex-start;
  border-radius: var(--rfb-radius);
  font-size: 0.95rem;
  text-align: left;
}

body.fgas-nav-open {
  overflow: hidden;
  overscroll-behavior: none;
}

/* Multi-coloured section tabs */
.fgas-tab {
  --fgas-tab-accent: var(--fgas-tab-default);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: var(--fgas-touch);
  padding: 10px 16px;
  border-radius: 999px;
  border: 2px solid color-mix(in srgb, var(--fgas-tab-accent) 55%, var(--rfb-border));
  background: color-mix(in srgb, var(--fgas-tab-accent) 14%, var(--rn-n800));
  color: var(--rn-white);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.12s;
}
.fgas-tab:hover {
  background: color-mix(in srgb, var(--fgas-tab-accent) 24%, var(--rn-n800));
  border-color: var(--fgas-tab-accent);
  color: var(--rn-white);
  text-decoration: none;
}
.fgas-tab:focus-visible {
  outline: 3px solid var(--fgas-tab-accent);
  outline-offset: 2px;
}
.fgas-tab.active,
.fgas-tab[aria-current="page"] {
  background: color-mix(in srgb, var(--fgas-tab-accent) 32%, var(--rn-n700));
  border-color: var(--fgas-tab-accent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--fgas-tab-accent) 40%, transparent),
    inset 0 0 0 1px rgba(255, 255, 255, 0.08);
  color: var(--rn-white);
}

.fgas-tab--home { --fgas-tab-accent: var(--fgas-tab-home); }
.fgas-tab--syllabus { --fgas-tab-accent: var(--fgas-tab-syllabus); }
.fgas-tab--guide { --fgas-tab-accent: var(--fgas-tab-guide); }
.fgas-tab--topics { --fgas-tab-accent: var(--fgas-tab-topics); }
.fgas-tab--glossary { --fgas-tab-accent: var(--fgas-tab-glossary); }
.fgas-tab--exam-prep { --fgas-tab-accent: var(--fgas-tab-exam-prep); }
.fgas-tab--exam { --fgas-tab-accent: var(--fgas-tab-exam); }
.fgas-tab--quiz { --fgas-tab-accent: var(--fgas-tab-quiz); }
.fgas-tab--pressure { --fgas-tab-accent: var(--fgas-tab-pressure); }
.fgas-tab--resources { --fgas-tab-accent: var(--fgas-tab-resources); }
.fgas-tab--study-links { --fgas-tab-accent: var(--fgas-tab-study-links); }
.fgas-tab--progress { --fgas-tab-accent: var(--fgas-tab-progress); }
.fgas-tab--search { --fgas-tab-accent: var(--fgas-tab-search); }
.fgas-tab--tools { --fgas-tab-accent: var(--fgas-tab-tools); }
.fgas-tab--admin { --fgas-tab-accent: var(--fgas-tab-admin); }
.fgas-tab--default { --fgas-tab-accent: var(--fgas-tab-default); }

.fgas-tab--topic-variant-0 { --fgas-tab-accent: #58aae9; }
.fgas-tab--topic-variant-1 { --fgas-tab-accent: #6ecf7a; }
.fgas-tab--topic-variant-2 { --fgas-tab-accent: #e8c242; }
.fgas-tab--topic-variant-3 { --fgas-tab-accent: #f06a62; }
.fgas-tab--topic-variant-4 { --fgas-tab-accent: #b48cff; }
.fgas-tab--topic-variant-5 { --fgas-tab-accent: #5ec9c9; }

.fgas-tab-bar {
  margin: 1rem 0 0;
}
.fgas-tab-bar-scroll {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  align-items: center;
}
@media (max-width: 640px) {
  .fgas-tab-bar--topics .fgas-tab-bar-scroll,
  .fgas-tab-bar--exam .fgas-tab-bar-scroll {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 6px;
    margin: 0 -4px;
    padding-left: 4px;
    padding-right: 4px;
    scrollbar-width: thin;
    scrollbar-color: var(--rn-n500) transparent;
  }
  .fgas-tab-bar--topics .fgas-tab,
  .fgas-tab-bar--exam .fgas-tab {
    flex: 0 0 auto;
  }
}

/* Hub / index cards — coloured section tabs */
.fgas-hub-card {
  --fgas-tab-accent: var(--fgas-tab-default);
  border-left-width: 4px;
  border-left-style: solid;
  border-left-color: var(--fgas-tab-accent);
  transition: border-color 0.15s, background 0.15s, transform 0.12s;
}
.fgas-hub-card:hover,
.fgas-hub-card:focus-visible {
  border-color: color-mix(in srgb, var(--fgas-tab-accent) 70%, var(--rfb-border));
  border-left-color: var(--fgas-tab-accent);
  background: color-mix(in srgb, var(--fgas-tab-accent) 10%, var(--rfb-surface));
}
.fgas-hub-card h3 {
  color: var(--fgas-tab-accent);
}
.fgas-hub-card--home { --fgas-tab-accent: var(--fgas-tab-home); }
.fgas-hub-card--syllabus { --fgas-tab-accent: var(--fgas-tab-syllabus); }
.fgas-hub-card--guide { --fgas-tab-accent: var(--fgas-tab-guide); }
.fgas-hub-card--topics { --fgas-tab-accent: var(--fgas-tab-topics); }
.fgas-hub-card--glossary { --fgas-tab-accent: var(--fgas-tab-glossary); }
.fgas-hub-card--exam-prep { --fgas-tab-accent: var(--fgas-tab-exam-prep); }
.fgas-hub-card--exam { --fgas-tab-accent: var(--fgas-tab-exam); }
.fgas-hub-card--quiz { --fgas-tab-accent: var(--fgas-tab-quiz); }
.fgas-hub-card--pressure { --fgas-tab-accent: var(--fgas-tab-pressure); }
.fgas-hub-card--resources { --fgas-tab-accent: var(--fgas-tab-resources); }
.fgas-hub-card--study-links { --fgas-tab-accent: var(--fgas-tab-study-links); }
.fgas-hub-card--progress { --fgas-tab-accent: var(--fgas-tab-progress); }
.fgas-hub-card--search { --fgas-tab-accent: var(--fgas-tab-search); }
.fgas-hub-card--tools { --fgas-tab-accent: var(--fgas-tab-tools); }
.fgas-hub-card--electrical { --fgas-tab-accent: var(--fgas-tab-electrical); }
.fgas-hub-card--ev { --fgas-tab-accent: var(--fgas-tab-ev); }
.fgas-hub-card--gasap { --fgas-tab-accent: var(--fgas-tab-gasap); }
.fgas-hub-card--admin { --fgas-tab-accent: var(--fgas-tab-admin); }
.fgas-hub-card--default { --fgas-tab-accent: var(--fgas-tab-default); }

/* Multi-pathway hub (post-login home) */
.fgas-pathway-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 1rem;
}
.fgas-pathway-card {
  display: flex;
  flex-direction: column;
  min-height: 11rem;
}
.fgas-pathway-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.75rem;
}
.fgas-pathway-card-actions .fgas-btn {
  min-height: var(--fgas-touch, 44px);
  flex: 1 1 8rem;
  justify-content: center;
}
.fgas-badge-soon {
  font-size: 0.72rem;
  vertical-align: middle;
  margin-left: 0.25rem;
}
@media (max-width: 768px) {
  .fgas-pathway-grid {
    grid-template-columns: 1fr;
  }
}

/* Main layout */
.fgas-main {
  max-width: var(--fgas-content-max);
  margin: 0 auto;
  padding: var(--fgas-space);
  padding-bottom: 3rem;
  width: 100%;
}
.fgas-body {
  overflow-x: hidden;
  font-size: 1rem;
  line-height: 1.6;
}

/* Breadcrumbs */
.fgas-breadcrumbs {
  margin-bottom: 1rem;
  font-size: 0.9rem;
}
.fgas-breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--rfb-muted);
}
.fgas-breadcrumbs li:not(:last-child)::after {
  content: '/';
  margin-left: 8px;
  color: var(--rn-n400);
  speak-as: none;
}
.fgas-breadcrumbs a {
  color: var(--rn-a400);
  text-decoration: underline;
  text-underline-offset: 2px;
  min-height: var(--fgas-touch);
  display: inline-flex;
  align-items: center;
}
.fgas-breadcrumbs [aria-current="page"] {
  color: var(--rn-white);
  font-weight: 600;
}

/* Prose / readability */
.fgas-prose {
  max-width: var(--fgas-prose-max);
}
.fgas-prose-wide {
  max-width: none;
}
.fgas-prose h1,
.fgas-hero h1 {
  font-size: clamp(1.5rem, 4vw, 1.85rem);
  line-height: 1.25;
}
.fgas-prose h2,
.fgas-section h2 {
  font-size: clamp(1.2rem, 3vw, 1.4rem);
  scroll-margin-top: 6rem;
}
.fgas-prose h3,
.fgas-section h3 {
  font-size: 1.1rem;
  scroll-margin-top: 6rem;
}
.fgas-section p,
.fgas-section li,
.fgas-hero p {
  font-size: 1rem;
  line-height: 1.65;
  max-width: var(--fgas-prose-max);
}
.fgas-section ul,
.fgas-section ol {
  margin-left: 1.35rem;
  margin-bottom: 1rem;
}
.fgas-section li { margin-bottom: 0.5rem; }

/* Guide layout: TOC sidebar → drawer on mobile */
.fgas-guide-layout {
  display: grid;
  gap: 1.5rem;
  align-items: start;
}
@media (min-width: 960px) {
  .fgas-guide-layout {
    grid-template-columns: var(--fgas-sidebar) 1fr;
  }
}
.fgas-guide-toc-wrap {
  position: relative;
}
.fgas-toc-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: var(--fgas-touch);
  padding: 12px 16px;
  background: var(--rfb-surface);
  border: 1px solid var(--rfb-border);
  border-radius: var(--rfb-radius);
  color: var(--rn-white);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
@media (min-width: 960px) {
  .fgas-toc-toggle { display: none; }
}
.fgas-guide-toc {
  background: var(--rfb-surface);
  border: 1px solid var(--rfb-border);
  border-radius: var(--rfb-radius);
  padding: 1rem 1.1rem;
}
@media (max-width: 959px) {
  .fgas-guide-toc {
    display: none;
    position: fixed;
    inset: 0 auto 0 0;
    width: min(20rem, 88vw);
    max-height: 100vh;
    overflow-y: auto;
    z-index: 950;
    margin: 0;
    border-radius: 0;
    box-shadow: var(--rfb-shadow);
    padding-top: 4.5rem;
  }
  .fgas-guide-toc.is-open {
    display: block;
  }
  .fgas-toc-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 940;
  }
  .fgas-toc-backdrop.is-open { display: block; }
}
@media (min-width: 960px) {
  .fgas-guide-toc {
    position: sticky;
    top: 5.5rem;
    max-height: calc(100vh - 6rem);
    overflow-y: auto;
  }
}
.fgas-guide-toc h2 {
  font-size: 0.95rem;
  color: var(--rfb-accent);
  margin-bottom: 0.75rem;
  border: none;
  padding: 0;
}
.fgas-toc a {
  display: block;
  padding: 10px 8px;
  min-height: var(--fgas-touch);
  line-height: 1.35;
  color: var(--rn-a400);
  text-decoration: none;
  border-radius: 6px;
}
.fgas-toc a:hover,
.fgas-toc a:focus-visible {
  background: rgba(232, 194, 66, 0.08);
  color: var(--rn-white);
}

.fgas-toc-extra {
  margin-top: 1rem;
  font-size: 0.88rem;
}
.fgas-toc-extra a {
  color: var(--rn-a400);
}

.fgas-find-fast {
  background: var(--rfb-surface-2);
  border: 1px solid var(--rfb-border);
  border-radius: var(--rfb-radius);
  padding: 12px 16px;
  margin: 0 0 1.25rem;
}
.fgas-find-fast-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--rfb-accent);
  margin: 0 0 8px;
}
.fgas-find-fast ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.fgas-find-fast a {
  color: var(--rn-a400);
  text-decoration: none;
  font-size: 0.92rem;
  padding: 6px 0;
  min-height: var(--fgas-touch);
  display: inline-flex;
  align-items: center;
}
.fgas-find-fast a:hover,
.fgas-find-fast a:focus-visible {
  color: var(--rn-white);
  text-decoration: underline;
}

.fgas-exam-bites {
  border-left-color: var(--rfb-accent);
}
.fgas-exam-bites .fgas-tip-label {
  color: var(--rfb-accent);
}

.fgas-section-links {
  margin-top: 1.25rem;
  font-size: 0.92rem;
}
.fgas-section-links a {
  color: var(--rn-a400);
  margin-right: 1rem;
}

.fgas-guide-section {
  scroll-margin-top: 5.5rem;
}

/* Callouts / exam tips */
.fgas-callout,
.fgas-exam-tip {
  background: var(--rfb-surface-2);
  border-left: 4px solid var(--rfb-primary);
  padding: 1rem 1.15rem;
  margin: 1.25rem 0;
  border-radius: 0 var(--rfb-radius) var(--rfb-radius) 0;
  max-width: var(--fgas-prose-max);
}
.fgas-exam-tip,
.fgas-callout.fgas-exam-tip {
  border-left-color: var(--rfb-accent);
  background: rgba(232, 194, 66, 0.08);
}
.fgas-exam-tip::before {
  content: 'Exam tip';
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--rfb-accent);
  margin-bottom: 0.35rem;
}
.fgas-memory-tip {
  border-left-color: var(--rn-a500);
  background: rgba(58, 143, 221, 0.08);
}
.fgas-memory-tip .fgas-tip-label {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--rn-a400);
  margin-bottom: 0.35rem;
}

/* Guide index & chapter nav */
.fgas-toc-grid .fgas-toc-numbered {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}
@media (min-width: 640px) {
  .fgas-toc-grid .fgas-toc-numbered {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}
.fgas-toc-numbered li {
  background: var(--rfb-surface);
  border: 1px solid var(--rfb-border);
  border-radius: var(--rfb-radius);
  padding: 1rem 1.1rem;
}
.fgas-toc-numbered a {
  display: block;
  min-height: var(--fgas-touch);
  font-weight: 600;
  color: var(--rn-a400);
  text-decoration: none;
  padding: 4px 0;
}
.fgas-ch-num {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--rfb-accent);
  margin-right: 6px;
}
.fgas-chapter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rfb-border);
}
.fgas-chapter {
  width: 100%;
}

/* Images */
.fgas-slide,
.fgas-prose img,
.fgas-section img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--rfb-border);
  border-radius: var(--rfb-radius);
  margin: 1rem 0;
  background: #fff;
}
.fgas-figure {
  margin: 1.25rem 0;
  max-width: 100%;
}
.fgas-figure figcaption {
  margin-top: 0.5rem;
  font-size: 0.88rem;
  color: var(--rfb-muted);
  line-height: 1.45;
}
.fgas-diagram {
  background: #f4f4f4;
  border-radius: 10px;
  padding: 0.75rem;
}
.fgas-figure img,
.fgas-figure svg,
.fgas-diagram-img {
  max-width: 100%;
  min-height: 200px;
  height: auto;
  display: block;
  background: #f8f9fa;
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: 8px;
  padding: 1rem;
  box-sizing: border-box;
}
.fgas-figure-stack {
  display: grid;
  gap: 1rem;
}
@media (min-width: 720px) {
  .fgas-figure-stack--2 {
    grid-template-columns: 1fr 1fr;
  }
  .fgas-figure-stack--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Cards & grid */
.fgas-grid {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
  gap: clamp(12px, 2vw, 18px);
}
.fgas-card {
  min-height: var(--fgas-touch);
  padding: 1.15rem 1.25rem;
}
.fgas-card:focus-visible {
  border-color: var(--rfb-accent);
}

/* Forms */
.fgas-form label,
.fgas-field-label {
  display: block;
  margin: 14px 0 6px;
  color: var(--rn-n200);
  font-weight: 600;
  font-size: 0.95rem;
}
.fgas-form input,
.fgas-form select,
.fgas-form textarea {
  width: 100%;
  max-width: 28rem;
  min-height: var(--fgas-touch);
  padding: 10px 14px;
  font-size: 1rem;
  line-height: 1.4;
}
.fgas-form input:invalid:not(:placeholder-shown),
.fgas-form input.fgas-input-error {
  border-color: var(--rfb-danger);
}
.fgas-form input[aria-invalid="true"] {
  border-color: var(--rfb-danger);
}
.fgas-field-hint {
  font-size: 0.875rem;
  color: var(--rfb-muted);
  margin-top: 4px;
}

/* Buttons */
.fgas-btn {
  min-height: var(--fgas-touch);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 1rem;
  line-height: 1.3;
  gap: 8px;
}
.fgas-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* Quiz / exam */
.fgas-quiz-q {
  padding: clamp(16px, 3vw, 24px);
}
.fgas-quiz-q > p:first-child {
  font-size: 1.05rem;
  line-height: 1.55;
  margin-bottom: 1rem;
}
.fgas-progress {
  height: 8px;
  background: var(--rn-n700);
  border-radius: 999px;
  overflow: hidden;
  margin: 0 0 1.25rem;
}
.fgas-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--rfb-primary), var(--rfb-accent));
  border-radius: 999px;
  transition: width 0.25s ease;
}
.fgas-progress-label {
  font-size: 0.9rem;
  color: var(--rfb-muted);
  margin-bottom: 0.5rem;
}
.fgas-quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 1rem 0;
}
.fgas-quiz-option {
  width: 100%;
  min-height: var(--fgas-touch);
  padding: 14px 18px;
  text-align: left;
  background: var(--rn-n800);
  border: 2px solid var(--rfb-border);
  border-radius: var(--rfb-radius);
  color: var(--rfb-text);
  font: inherit;
  font-size: 1rem;
  line-height: 1.45;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.fgas-quiz-option:hover:not(:disabled) {
  border-color: var(--rn-a500);
  background: var(--rfb-surface-2);
}
.fgas-quiz-option.is-selected {
  border-color: var(--rn-a500);
  background: rgba(58, 143, 221, 0.15);
}
.fgas-quiz-option.is-correct {
  border-color: var(--rfb-success);
  background: rgba(96, 178, 85, 0.12);
}
.fgas-quiz-option.is-wrong {
  border-color: var(--rfb-danger);
  background: rgba(236, 65, 56, 0.12);
}
.fgas-quiz-option:disabled {
  cursor: default;
  opacity: 0.95;
}
.fgas-quiz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 1rem;
}
.fgas-score {
  font-size: clamp(1.35rem, 4vw, 1.75rem);
  word-break: break-word;
}

/* Tables — horizontal scroll on small screens */
.fgas-table-wrap,
.fgas-table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1rem 0;
  max-width: 100%;
}
.fgas-table {
  min-width: 480px;
}
@media (max-width: 640px) {
  .fgas-table-responsive .fgas-table thead {
    display: none;
  }
  .fgas-table-responsive .fgas-table tr {
    display: block;
    margin-bottom: 1rem;
    border: 1px solid var(--rfb-border);
    border-radius: var(--rfb-radius);
    padding: 8px;
  }
  .fgas-table-responsive .fgas-table td {
    display: block;
    border: none;
    padding: 8px 10px;
  }
  .fgas-table-responsive .fgas-table td::before {
    content: attr(data-label);
    display: block;
    font-weight: 700;
    color: var(--rfb-accent);
    font-size: 0.8rem;
    margin-bottom: 4px;
  }
}

/* UK study links */
.fgas-study-disclaimer {
  margin: 0 0 1.25rem;
  padding: 12px 14px;
  border-left: 3px solid var(--fgas-tab-study-links);
  background: color-mix(in srgb, var(--fgas-tab-study-links) 8%, var(--rfb-surface));
  border-radius: var(--rfb-radius);
}
.fgas-tab-bar--electrical {
  margin-bottom: 1.25rem;
}
.fgas-tab-bar--electrical .fgas-tab-bar-scroll {
  flex-wrap: nowrap;
}
@media (min-width: 720px) {
  .fgas-tab-bar--electrical .fgas-tab-bar-scroll {
    flex-wrap: wrap;
  }
}
.fgas-electrical-hub-grid {
  margin-bottom: 1.5rem;
}
.fgas-electrical-path-grid .fgas-card--active {
  border-color: var(--fgas-tab-electrical, #1d4ed8);
  box-shadow: 0 0 0 2px rgba(29, 78, 216, 0.15);
}
.fgas-electrical-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.fgas-electrical-step {
  background: var(--rfb-surface);
  border: 1px solid var(--rfb-border);
  border-radius: var(--rfb-radius);
  padding: 1rem 1.25rem;
}
.fgas-electrical-step--pass {
  border-left: 4px solid #16a34a;
}
.fgas-electrical-step--try {
  border-left: 4px solid #ca8a04;
}
.fgas-electrical-step-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  margin-bottom: 0.5rem;
}
.fgas-electrical-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: #1d4ed8;
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
}
.fgas-electrical-step-head h3 {
  margin: 0;
  flex: 1;
  min-width: 10rem;
}
.fgas-electrical-step-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0 0;
}
.fgas-diagram-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr));
}
.fgas-qual-unit {
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rfb-border);
}
.fgas-qual-unit:last-child {
  border-bottom: none;
}
.fgas-tab-bar--study {
  margin-bottom: 1.25rem;
}
.fgas-study-link-grid,
.fgas-study-video-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
}
.fgas-study-card,
.fgas-study-video {
  background: var(--rfb-surface);
  border: 1px solid var(--rfb-border);
  border-radius: var(--rfb-radius);
  padding: 16px;
}
.fgas-study-card-title {
  font-size: 1.02rem;
  margin: 0 0 8px;
}
.fgas-study-card-title a {
  color: var(--fgas-tab-study-links);
  text-decoration: none;
}
.fgas-study-card-title a:hover {
  text-decoration: underline;
}
.fgas-study-card-why {
  margin: 0 0 8px;
  font-size: 0.92rem;
  color: var(--rfb-text);
}
.fgas-study-card-host {
  margin: 0;
  font-size: 0.82rem;
}
.fgas-study-embed-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin: 12px 0;
  border-radius: 6px;
  overflow: hidden;
  background: #000;
}
.fgas-study-embed {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.fgas-study-video-note {
  font-size: 0.88rem;
  margin: 0 0 10px;
}

/* Hero */
.fgas-hero {
  padding: clamp(18px, 4vw, 28px);
  margin-bottom: clamp(18px, 3vw, 28px);
}
.fgas-hero--narrow {
  max-width: 32rem;
  margin-left: auto;
  margin-right: auto;
}

/* Register — pricing badge & value props */
.fgas-register-price {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 0.45rem;
  padding: clamp(12px, 2.5vw, 16px) clamp(14px, 3vw, 18px);
  margin: 0 0 1rem;
  background: var(--rfb-surface-2);
  border: 1px solid var(--rfb-border);
  border-left: 4px solid var(--rfb-primary);
  border-radius: 0 var(--rfb-radius) var(--rfb-radius) 0;
  font-weight: 600;
  line-height: 1.35;
}
.fgas-register-price-amount {
  font-size: clamp(1.2rem, 3.5vw, 1.35rem);
  color: var(--rn-white);
}
.fgas-register-price-sep {
  color: var(--rfb-muted);
  font-weight: 500;
}
.fgas-register-price-term {
  color: var(--rfb-text);
}
.fgas-register-benefits {
  list-style: none;
  padding: 0;
  margin: 0 0 1.25rem;
}
.fgas-register-benefits li {
  position: relative;
  padding: 0.4rem 0 0.4rem 1.55rem;
  line-height: 1.45;
}
.fgas-register-benefits li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--fgas-tab-quiz);
  font-weight: 700;
}
.fgas-login-price-hint {
  font-size: 0.88em;
}

/* Status / maintenance / error (LEYO footer only) */
.fgas-status-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.fgas-status-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(24px, 6vw, 48px) var(--fgas-space);
}
.fgas-status-panel {
  max-width: 28rem;
  text-align: center;
  background: var(--rfb-surface);
  border: 1px solid var(--rfb-border);
  border-left: 4px solid var(--rfb-accent);
  border-radius: var(--rfb-radius);
  padding: clamp(28px, 5vw, 40px);
  box-shadow: var(--rfb-shadow);
}
.fgas-status-brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--rfb-text);
  margin-bottom: 1.5rem;
}
.fgas-status-brand:hover {
  color: var(--rn-white);
}
.fgas-status-brand-text {
  font-size: 1.35rem;
  font-weight: 700;
}
.fgas-status-headline {
  font-size: clamp(1.5rem, 4vw, 1.85rem);
  color: var(--rn-white);
  margin: 0 0 0.75rem;
}
.fgas-status-lead {
  font-size: 1.05rem;
  color: var(--rfb-text);
  margin: 0 0 0.65rem;
  line-height: 1.5;
}
.fgas-status-detail {
  font-size: 0.92rem;
  color: var(--rfb-muted);
  margin: 0;
  line-height: 1.55;
}
.fgas-status-footer {
  margin-top: auto;
}
.fgas-status-footer .fgas-footer-inner {
  text-align: center;
}

/* Landing (logged-out home) — above-the-fold first */
.fgas-body:has(.fgas-landing-fold) .rfb-app-title {
  display: none;
}
.fgas-body:has(.fgas-landing-fold) .fgas-main {
  padding-top: clamp(0.5rem, 1.5vw, 0.75rem);
}
.fgas-landing {
  max-width: var(--fgas-content-max);
  margin: 0 auto;
}
.fgas-landing-fold {
  margin-bottom: clamp(12px, 2vw, 18px);
  padding: clamp(12px, 2.5vw, 20px) clamp(12px, 2.5vw, 18px);
  border-radius: var(--rfb-radius);
  border: 1px solid var(--rfb-border);
  background:
    radial-gradient(ellipse 120% 80% at 10% 0%, rgba(232, 194, 66, 0.12), transparent 55%),
    radial-gradient(ellipse 90% 70% at 100% 100%, rgba(58, 143, 221, 0.1), transparent 50%),
    var(--rfb-surface);
  box-shadow: var(--rfb-shadow);
}
.fgas-landing-fold-grid {
  display: grid;
  gap: clamp(12px, 2.5vw, 20px);
  align-items: start;
}
@media (min-width: 900px) {
  .fgas-landing-fold-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(16rem, 0.95fr);
    gap: clamp(16px, 2vw, 24px);
  }
}
.fgas-landing-logo {
  max-height: 48px;
  width: auto;
  height: auto;
  margin: 0 0 6px;
}
@media (min-width: 900px) {
  .fgas-landing-logo {
    max-height: 64px;
    margin-bottom: 8px;
  }
}
.fgas-landing-tagline {
  margin: 0 0 6px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}
.fgas-landing-lead {
  font-size: clamp(0.9rem, 2.2vw, 1rem);
  line-height: 1.45;
  color: var(--rfb-text);
  max-width: 36rem;
  margin: 0 0 0.5rem;
}
.fgas-landing-price-from {
  font-size: clamp(1.02rem, 2.4vw, 1.12rem);
  font-weight: 700;
  color: var(--rn-white);
  margin: 0 0 0.85rem;
}
.fgas-landing-cta-hint {
  display: block;
  width: 100%;
  flex: 1 1 100%;
  font-size: 0.88rem;
  margin: -0.25rem 0 0;
  padding-left: 2px;
}
.fgas-landing-cta-row,
.fgas-landing-footer-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.fgas-landing-cta-row .fgas-btn,
.fgas-landing-footer-cta .fgas-btn,
.fgas-landing-sticky-btn {
  min-height: var(--fgas-touch);
  min-width: var(--fgas-touch);
  padding: 10px 16px;
  font-size: 0.95rem;
}
.fgas-landing-footer-cta {
  justify-content: center;
  padding: clamp(14px, 3vw, 22px) 0 6px;
}
.fgas-landing-cta-primary {
  background: linear-gradient(135deg, var(--rfb-accent) 0%, #c9a227 100%);
  color: #1a1200;
  font-weight: 700;
  border: none;
  box-shadow: 0 0 0 0 rgba(232, 194, 66, 0.45);
  animation: fgas-cta-pulse 2.8s ease-in-out infinite;
}
.fgas-landing-cta-primary:hover {
  color: #1a1200;
  filter: brightness(1.06);
}
@keyframes fgas-cta-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(232, 194, 66, 0.35); }
  50% { box-shadow: 0 0 0 10px rgba(232, 194, 66, 0); }
}
.fgas-landing-cta-ghost {
  border-color: var(--rn-a500);
  color: var(--fgas-tab-resources);
}
.fgas-landing-mates-compact {
  margin-top: 0.75rem;
  padding: 10px 12px;
  border-radius: var(--rfb-radius);
  border: 1px solid var(--rfb-accent);
  background: rgba(232, 194, 66, 0.07);
}
.fgas-landing-mates-title {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  color: var(--rn-white);
}
.fgas-landing-mates-compact p {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--rfb-text);
}
.fgas-landing-mates-btn {
  width: 100%;
  justify-content: center;
}
@media (min-width: 900px) {
  .fgas-landing-mates-btn {
    width: auto;
  }
}
.fgas-landing-pricing-heading {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--rn-white);
  text-align: center;
}
.fgas-landing-tier-grid--fold {
  max-width: none;
  margin: 0;
  gap: 10px;
}
.fgas-landing-tier-grid--fold .fgas-landing-tier-card {
  padding: 12px 14px;
}
.fgas-landing-tier-grid--fold .fgas-landing-tier-price {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  margin: 0.25rem 0 0.35rem;
}
.fgas-landing-tier-grid--fold .fgas-landing-tier-list {
  margin: 0 0 0.65rem;
  font-size: 0.82rem;
  line-height: 1.35;
}
.fgas-landing-tier-grid--fold h3 {
  margin: 0;
  font-size: 0.95rem;
}
.fgas-landing-tier-meta {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
}
.fgas-landing-below {
  padding-bottom: calc(4.5rem + env(safe-area-inset-bottom, 0px));
}
@media (min-width: 900px) {
  .fgas-landing-below {
    padding-bottom: 2rem;
  }
}
.fgas-landing-icon-strip {
  list-style: none;
  margin: 0 0 clamp(14px, 2.5vw, 20px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}
.fgas-landing-icon-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 6px;
  border-radius: var(--rfb-radius);
  border: 1px solid var(--rfb-border);
  background: var(--rfb-surface);
  text-align: center;
  font-size: 0.72rem;
  line-height: 1.25;
}
.fgas-landing-icon-item.fgas-tab-guide { border-top: 3px solid var(--fgas-tab-guide); }
.fgas-landing-icon-item.fgas-tab-quiz { border-top: 3px solid var(--fgas-tab-quiz); }
.fgas-landing-icon-item.fgas-tab-exam { border-top: 3px solid var(--fgas-tab-exam); }
.fgas-landing-icon-item.fgas-tab-pressure { border-top: 3px solid var(--fgas-tab-pressure); }
.fgas-landing-icon-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.85rem;
  background: var(--rn-n800);
  color: var(--rfb-accent);
}
.fgas-landing-icon-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.fgas-landing-icon-label span {
  color: var(--rfb-muted);
  font-size: 0.68rem;
}
.fgas-landing-proof-text--inline {
  margin: 0 0 clamp(14px, 2.5vw, 18px);
  padding: 10px 12px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fgas-tab-syllabus);
  border-radius: var(--rfb-radius);
  background: var(--rn-n800);
  border: 1px solid var(--rfb-border);
}
.fgas-landing-sticky {
  display: flex;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 850;
  padding: 8px var(--fgas-space) calc(8px + env(safe-area-inset-bottom, 0px));
  background: rgba(15, 23, 32, 0.94);
  border-top: 1px solid var(--rfb-border);
  backdrop-filter: blur(8px);
}
.fgas-landing-sticky-btn {
  flex: 1;
  justify-content: center;
  text-align: center;
}
@media (min-width: 900px) {
  .fgas-landing-sticky {
    display: none;
  }
}
.fgas-landing-section-title {
  font-size: clamp(1.2rem, 3vw, 1.45rem);
  color: var(--rn-white);
  margin: 0 0 1rem;
  text-align: center;
}
.fgas-landing-benefit-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .fgas-landing-benefit-list {
    grid-template-columns: repeat(2, 1fr);
  }
}
.fgas-landing-benefit {
  padding: 14px 16px;
  border-radius: var(--rfb-radius);
  border: 1px solid var(--rfb-border);
  border-left-width: 4px;
  background: var(--rfb-surface);
  line-height: 1.45;
}
.fgas-landing-benefit.fgas-tab-guide { border-left-color: var(--fgas-tab-guide); }
.fgas-landing-benefit.fgas-tab-quiz { border-left-color: var(--fgas-tab-quiz); }
.fgas-landing-benefit.fgas-tab-exam { border-left-color: var(--fgas-tab-exam); }
.fgas-landing-benefit.fgas-tab-pressure { border-left-color: var(--fgas-tab-pressure); }
.fgas-landing-benefit.fgas-tab-study-links { border-left-color: var(--fgas-tab-study-links); }
.fgas-landing-benefit.fgas-tab-topics { border-left-color: var(--fgas-tab-topics); }
.fgas-landing-proof {
  text-align: center;
  margin: clamp(20px, 4vw, 28px) 0;
  padding: 16px 20px;
  border-radius: var(--rfb-radius);
  background: var(--rn-n800);
  border: 1px solid var(--rfb-border);
}
.fgas-landing-proof-text {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fgas-tab-syllabus);
  letter-spacing: 0.02em;
}
.fgas-landing-pricing {
  margin-bottom: clamp(24px, 4vw, 36px);
}
.fgas-landing-subject-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
}
@media (min-width: 480px) {
  .fgas-landing-subject-grid {
    grid-template-columns: 1fr 1fr;
  }
}
.fgas-landing-subject-card {
  padding: 12px 14px;
  text-align: left;
}
.fgas-landing-subject-card .fgas-landing-tier-price {
  margin: 0.35rem 0;
  font-size: 1.15rem;
  font-weight: 700;
}
.fgas-landing-subject-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 0.65rem;
}
.fgas-landing-subject-actions .fgas-btn {
  flex: 1 1 auto;
  min-width: 7.5rem;
  text-align: center;
}
.fgas-subject-picker {
  margin: 1rem 0 1.25rem;
  padding: 0;
  border: none;
}
.fgas-subject-picker legend {
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.fgas-subject-check {
  display: block;
  margin-bottom: 0.35rem;
}
.fgas-landing-tier-grid {
  display: grid;
  gap: clamp(16px, 3vw, 24px);
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  max-width: 42rem;
  margin: 0 auto 1rem;
}
.fgas-landing-tier-card {
  padding: clamp(20px, 4vw, 28px);
  border-radius: var(--rfb-radius);
  border: 1px solid var(--rfb-border);
  background: var(--rfb-surface);
  box-shadow: var(--rfb-shadow);
  text-align: center;
}
.fgas-landing-tier-card--featured {
  border-color: var(--rfb-accent, #3b82f6);
}
.fgas-landing-tier-price {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  margin: 0.5rem 0 1rem;
}
.fgas-landing-tier-list {
  text-align: left;
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
  font-size: 0.95rem;
}
.fgas-landing-bulk-note {
  text-align: center;
  max-width: 36rem;
  margin: 0 auto;
}
.fgas-landing-h1 {
  font-size: clamp(1.2rem, 3.5vw, 1.65rem);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}
.fgas-upgrade-cta {
  margin: 1rem 0;
}
.fgas-landing-price-card {
  max-width: 22rem;
  margin: 0 auto;
  text-align: center;
  padding: clamp(24px, 5vw, 36px);
  border-radius: var(--rfb-radius);
  border: 1px solid var(--rfb-border);
  background: var(--rfb-surface);
  box-shadow: var(--rfb-shadow);
}
.fgas-landing-price-was {
  margin: 0;
  color: var(--rfb-muted);
  font-size: 1.1rem;
}
.fgas-landing-price-now {
  margin: 0.25rem 0 0.75rem;
  font-size: clamp(2.2rem, 8vw, 3rem);
  font-weight: 800;
  color: var(--rfb-accent);
  line-height: 1.1;
}
.fgas-landing-price-note {
  font-size: 0.95rem;
  color: var(--rfb-muted);
  margin: 0 0 1.25rem;
  line-height: 1.5;
}
.fgas-landing-preview-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.fgas-landing-preview-item {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border-radius: var(--rfb-radius);
  border: 1px solid var(--rfb-border);
  border-left: 4px solid var(--fgas-tab-default);
  background: var(--rfb-surface);
}
.fgas-landing-preview-item.fgas-tab-pressure { border-left-color: var(--fgas-tab-pressure); }
.fgas-landing-preview-item.fgas-tab-technical { border-left-color: var(--fgas-tab-topics); }
.fgas-landing-preview-item span {
  font-size: 0.92rem;
  color: var(--rfb-muted);
}
.fgas-landing-preview-lead,
.fgas-landing-preview-more {
  text-align: center;
  color: var(--rfb-muted);
  font-size: 0.95rem;
}
.fgas-landing-reveal {
  opacity: 0;
  transform: translateY(12px);
  animation: fgas-landing-in 0.7s ease forwards;
}
.fgas-landing-reveal--2 { animation-delay: 0.08s; }
.fgas-landing-reveal--3 { animation-delay: 0.16s; }
.fgas-landing-reveal--4 { animation-delay: 0.24s; }
.fgas-landing-reveal--5 { animation-delay: 0.32s; }
.fgas-landing-reveal--6 { animation-delay: 0.4s; }
.fgas-landing-reveal--7 { animation-delay: 0.48s; }
@keyframes fgas-landing-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .fgas-landing-reveal {
    opacity: 1;
    transform: none;
    animation: none;
  }
  .fgas-landing-cta-primary {
    animation: none;
  }
}
@media (max-width: 359px) {
  .fgas-landing-icon-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Blog list */
.fgas-blog-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.fgas-blog-list-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--rfb-border);
}
.fgas-blog-list-item h2 {
  font-size: clamp(1.1rem, 3vw, 1.35rem);
  margin: 0 0 0.5rem;
}
.fgas-blog-list-item h2 a {
  color: var(--rn-a400);
  text-decoration: none;
  display: inline-block;
  min-height: var(--fgas-touch);
  line-height: 1.35;
  padding: 4px 0;
}
.fgas-blog-post {
  max-width: var(--fgas-prose-max);
}
.fgas-blog-post img,
.fgas-blog-post .fgas-figure {
  max-width: 100%;
}

/* Search — tap-friendly hits */
.fgas-search-form {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
  margin-bottom: 1.25rem;
}
.fgas-search-form input[type="search"] {
  flex: 1 1 12rem;
  max-width: 100%;
}
.fgas-search-hits li {
  padding: 12px 0;
}
.fgas-search-hits li a {
  display: inline-block;
  min-height: var(--fgas-touch);
  padding: 6px 0;
  line-height: 1.4;
}

/* Compact hero (quiz / exam) */
.fgas-hero--compact {
  padding: clamp(12px, 2.5vw, 18px);
  margin-bottom: 0.75rem;
}
.fgas-hero--compact h1 {
  font-size: clamp(1.2rem, 3.5vw, 1.45rem);
  margin-bottom: 0.35rem;
}
.fgas-hero--compact p {
  font-size: 0.92rem;
  line-height: 1.45;
  margin: 0.2rem 0;
}

/* Quiz / exam progress — sticky below topbar on phones */
.fgas-quiz-progress-block {
  margin-bottom: 1rem;
}
@media (max-width: 768px) {
  .fgas-quiz-progress-block {
    position: sticky;
    top: calc(3.25rem + env(safe-area-inset-top, 0px));
    z-index: 800;
    padding: 8px 0 10px;
    margin: 0 0 0.75rem;
    background: var(--rfb-bg, #0f1720);
    border-bottom: 1px solid var(--rfb-border);
  }
  .fgas-page-quiz .fgas-hero--compact,
  .fgas-page-exam .fgas-hero--compact {
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
  }
  .fgas-page-quiz .fgas-tab-bar,
  .fgas-page-exam .fgas-tab-bar {
    margin-top: 0.35rem;
  }
  .fgas-quiz-actions {
    flex-direction: column;
  }
  .fgas-quiz-actions .fgas-btn {
    width: 100%;
    flex: 1 1 auto;
  }
  #fgas-exam-timer {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
  }
}

/* Mobile UX — phones & narrow tablets (≤768px) */
@media (max-width: 768px) {
  .fgas-topbar .fgas-nav-toggle-label {
    display: inline;
  }
  body.fgas-toc-open {
    overflow: hidden;
    overscroll-behavior: none;
  }
  .fgas-main {
    padding-left: max(var(--fgas-space), env(safe-area-inset-left, 0px));
    padding-right: max(var(--fgas-space), env(safe-area-inset-right, 0px));
  }
  .fgas-form input,
  .fgas-form select,
  .fgas-form textarea {
    max-width: none;
  }
  .fgas-search-form {
    flex-direction: column;
    align-items: stretch;
  }
  .fgas-search-form .fgas-btn {
    width: 100%;
  }
  .fgas-alpha-nav a {
    min-height: var(--fgas-touch);
    min-width: var(--fgas-touch);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 12px;
    font-size: 0.95rem;
  }
  .fgas-diagram-img,
  .fgas-figure.fgas-diagram img {
    min-height: 120px;
    padding: 0.65rem;
  }
  .fgas-landing-fold {
    overflow: visible;
  }
  .fgas-body:has(.fgas-landing-sticky) {
    overflow-x: hidden;
  }
  .fgas-stripe-stepper.fgas-table-scroll {
    margin: 1.25rem 0 1.5rem;
    padding-bottom: 4px;
  }
  .fgas-stripe-stepper-list {
    min-width: 36rem;
  }
  .fgas-hub-grid {
    grid-template-columns: 1fr;
  }
  .fgas-cert-table input,
  .fgas-cert-table textarea {
    font-size: 16px;
  }
}

/* Footer */
.fgas-footer {
  padding: clamp(18px, 4vw, 28px) var(--fgas-space);
}

/* Visually hidden (a11y) */
.fgas-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Print — guide chapters */
@media print {
  .fgas-skip-link,
  .fgas-nav-toggle,
  .fgas-nav-backdrop,
  .fgas-toc-toggle,
  .fgas-toc-backdrop,
  .rfb-topbar,
  .fgas-footer,
  .fgas-breadcrumbs,
  .fgas-nav-drawer,
  .fgas-btn { display: none !important; }
  .fgas-body {
    background: #fff;
    color: #111;
    font-size: 11pt;
  }
  .fgas-main {
    max-width: none;
    padding: 0;
  }
  .fgas-guide-layout {
    display: block;
  }
  .fgas-guide-toc {
    display: block !important;
    position: static;
    border: 1px solid #ccc;
    margin-bottom: 1.5rem;
    page-break-after: avoid;
  }
  .fgas-section {
    page-break-inside: avoid;
  }
  .fgas-slide,
  img {
    max-width: 100% !important;
    page-break-inside: avoid;
  }
  .fgas-callout,
  .fgas-exam-tip {
    border: 1px solid #999;
    background: #f5f5f5;
  }
  a[href^="http"]::after {
    content: ' (' attr(href) ')';
    font-size: 9pt;
  }
}