/*
 * TitleFlash guide design system — "the reading room".
 * Standalone stylesheet for /guides and /guides/<slug> pages.
 * Depends only on /tokens.css. Do NOT load landing.css alongside this.
 *
 * Type system: Fraunces (variable, optical sizing) carries both display
 * and body text for an editorial reading feel; Inter is reserved for
 * wayfinding chrome — TOC, labels, captions, tables, meta, buttons.
 */

:root {
  --gd-prose-size: 1.1875rem;       /* 19px body text */
  --gd-prose-leading: 1.78;
  --gd-measure: 42.5rem;            /* ~66ch at prose size */
  --gd-rail-w: 13.5rem;
  --gd-gutter: clamp(1.25rem, 4vw, 2.5rem);
  --gd-header-h: 3.75rem;
  --gd-ink-prose: #232936;
}

/* Base ---------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
}

body.guide-page {
  margin: 0;
  background: var(--tf-canvas);
  color: var(--tf-ink);
  font-family: var(--tf-font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.guide-page::before {
  /* faint paper grain so large cream fields don't feel flat */
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image: radial-gradient(rgba(34, 28, 16, 0.035) 1px, transparent 1px);
  background-size: 26px 26px;
}

.guide-page > * {
  position: relative;
  z-index: 1;
}

::selection {
  background: var(--tf-amber-soft);
  color: var(--tf-ink);
}

img {
  max-width: 100%;
  height: auto;
}

/* Reading progress ----------------------------------------------------- */

.guide-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 80;
  pointer-events: none;
}

.guide-progress span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--tf-amber), var(--tf-coral));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

@supports (animation-timeline: scroll()) {
  .guide-progress span {
    animation: gd-progress linear both;
    animation-timeline: scroll(root block);
  }
}

@keyframes gd-progress {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* Site header ----------------------------------------------------------- */

.guide-site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  height: var(--gd-header-h);
  display: flex;
  align-items: center;
  padding: 0 var(--gd-gutter);
  background: color-mix(in srgb, var(--tf-canvas) 86%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--tf-line);
}

.guide-header-inner {
  width: 100%;
  max-width: 72rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--tf-space-4);
}

.guide-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--tf-font-display);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--tf-ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.guide-brand-mark {
  display: inline-flex;
  width: 1.65rem;
  height: 1.65rem;
  align-items: center;
  justify-content: center;
  border-radius: var(--tf-radius-sm);
  background: var(--tf-teal);
  box-shadow: var(--tf-shadow-xs);
}

.guide-brand-mark svg {
  width: 0.95rem;
  height: 0.95rem;
  fill: var(--tf-amber-soft);
}

.guide-header-crumb {
  display: inline-flex;
  align-items: center;
  gap: var(--tf-space-3);
  font-size: var(--tf-text-sm);
  color: var(--tf-muted);
}

.guide-header-crumb::before {
  content: "";
  width: 1px;
  height: 1.1rem;
  background: var(--tf-line-strong);
  transform: rotate(18deg);
}

.guide-header-crumb a {
  color: var(--tf-muted);
  text-decoration: none;
  font-weight: 500;
}

.guide-header-crumb a:hover {
  color: var(--tf-teal);
}

.guide-header-actions {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--tf-space-5);
}

.guide-header-link {
  font-size: var(--tf-text-sm);
  font-weight: 500;
  color: var(--tf-muted);
  text-decoration: none;
}

.guide-header-link:hover {
  color: var(--tf-ink);
}

.guide-header-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.95rem;
  border-radius: var(--tf-radius-pill);
  background: var(--tf-ink);
  color: var(--tf-paper);
  font-size: var(--tf-text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--tf-duration-fast) var(--tf-ease-out),
    transform var(--tf-duration-fast) var(--tf-ease-out);
}

.guide-header-cta:hover {
  background: var(--tf-teal-dark);
  transform: translateY(-1px);
}

.guide-header-cta .gd-arrow {
  transition: transform var(--tf-duration-fast) var(--tf-ease-out);
}

.guide-header-cta:hover .gd-arrow {
  transform: translateX(2px);
}

@media (max-width: 640px) {
  .guide-header-link {
    display: none;
  }
}

/* Shell ------------------------------------------------------------------ */

.guide-shell {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 var(--gd-gutter) var(--tf-space-24);
}

/* Article hero ------------------------------------------------------------ */

.guide-hero {
  max-width: 46rem;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 0;
  text-align: left;
}

.guide-crumbs {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: var(--tf-text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--tf-muted-soft);
  animation: gd-rise 0.6s var(--tf-ease-out) both;
}

.guide-crumbs a {
  color: var(--tf-muted);
  text-decoration: none;
}

.guide-crumbs a:hover {
  color: var(--tf-teal);
}

.guide-crumbs span[aria-hidden] {
  color: var(--tf-line-strong);
}

.guide-kicker {
  margin: var(--tf-space-6) 0 0;
  font-size: var(--tf-text-sm);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--tf-teal);
  animation: gd-rise 0.6s 0.05s var(--tf-ease-out) both;
}

.guide-hero h1 {
  margin: var(--tf-space-4) 0 0;
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: clamp(2.1rem, 1.4rem + 3vw, 3.3rem);
  font-weight: 560;
  line-height: 1.12;
  letter-spacing: -0.018em;
  text-wrap: balance;
  color: var(--tf-ink);
  animation: gd-rise 0.6s 0.1s var(--tf-ease-out) both;
}

.guide-lede {
  margin: var(--tf-space-6) 0 0;
  max-width: 38rem;
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: clamp(1.2rem, 1.05rem + 0.6vw, 1.4rem);
  line-height: 1.55;
  font-weight: 420;
  color: var(--tf-muted);
  text-wrap: pretty;
  animation: gd-rise 0.6s 0.15s var(--tf-ease-out) both;
}

.guide-byline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--tf-space-3);
  margin-top: var(--tf-space-8);
  padding: var(--tf-space-4) 0;
  border-top: 1px solid var(--tf-line-strong);
  border-bottom: 1px solid var(--tf-line);
  font-size: var(--tf-text-sm);
  font-weight: 500;
  color: var(--tf-muted);
  animation: gd-rise 0.6s 0.2s var(--tf-ease-out) both;
}

.guide-byline time {
  color: var(--tf-ink-soft);
}

.guide-byline-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--tf-amber);
}

.guide-hero-figure {
  max-width: 56rem;
  margin: clamp(2rem, 5vw, 3.5rem) auto 0;
  animation: gd-rise 0.7s 0.25s var(--tf-ease-out) both;
}

.guide-hero-figure img {
  display: block;
  width: 100%;
  border-radius: var(--tf-radius-xl);
  border: 1px solid var(--tf-line-strong);
  box-shadow: var(--tf-shadow-md);
  background: var(--tf-paper);
}

.guide-hero-figure figcaption,
.guide-figure figcaption {
  margin-top: var(--tf-space-3);
  font-size: var(--tf-text-sm);
  line-height: 1.55;
  color: var(--tf-muted-soft);
}

@keyframes gd-rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .guide-crumbs,
  .guide-kicker,
  .guide-hero h1,
  .guide-lede,
  .guide-byline,
  .guide-hero-figure {
    animation: none;
  }
}

/* Body layout: rail + prose ------------------------------------------------ */

.guide-body {
  display: grid;
  grid-template-columns: var(--gd-rail-w) minmax(0, var(--gd-measure));
  justify-content: center;
  gap: clamp(2rem, 5vw, 4.5rem);
  margin-top: clamp(2.5rem, 6vw, 4rem);
}

.guide-rail {
  display: block;
}

.guide-toc {
  position: sticky;
  top: calc(var(--gd-header-h) + 1.5rem);
  padding-top: var(--tf-space-2);
}

.guide-toc strong {
  display: block;
  font-size: var(--tf-text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--tf-muted-soft);
  margin-bottom: var(--tf-space-4);
}

.guide-toc nav {
  display: flex;
  flex-direction: column;
  counter-reset: gd-toc;
  border-left: 1px solid var(--tf-line-strong);
}

.guide-toc nav a {
  position: relative;
  counter-increment: gd-toc;
  display: flex;
  gap: 0.6rem;
  padding: 0.42rem 0 0.42rem 1rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 0.8125rem;
  line-height: 1.4;
  font-weight: 500;
  color: var(--tf-muted);
  text-decoration: none;
  transition: color var(--tf-duration-fast) var(--tf-ease-out),
    border-color var(--tf-duration-fast) var(--tf-ease-out);
}

.guide-toc nav a::before {
  content: counter(gd-toc, decimal-leading-zero);
  flex: none;
  font-family: var(--tf-font-mono);
  font-size: var(--tf-text-2xs);
  line-height: 1.7;
  color: var(--tf-quiet);
  transition: color var(--tf-duration-fast) var(--tf-ease-out);
}

.guide-toc nav a:hover {
  color: var(--tf-ink);
}

.guide-toc nav a[aria-current="true"] {
  color: var(--tf-teal-dark);
  border-left-color: var(--tf-teal);
}

.guide-toc nav a[aria-current="true"]::before {
  color: var(--tf-amber-dark);
}

.guide-toc-progress {
  margin-top: var(--tf-space-5);
  font-family: var(--tf-font-mono);
  font-size: var(--tf-text-2xs);
  letter-spacing: 0.06em;
  color: var(--tf-quiet);
}

/* Mobile TOC */

.guide-toc-mobile {
  display: none;
  margin: 0 0 var(--tf-space-8);
  border: 1px solid var(--tf-line-strong);
  border-radius: var(--tf-radius-lg);
  background: var(--tf-paper);
  box-shadow: var(--tf-shadow-xs);
}

.guide-toc-mobile summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--tf-space-4) var(--tf-space-5);
  font-size: var(--tf-text-sm);
  font-weight: 600;
  color: var(--tf-ink);
  cursor: pointer;
  list-style: none;
}

.guide-toc-mobile summary::-webkit-details-marker {
  display: none;
}

.guide-toc-mobile summary::after {
  content: "+";
  font-family: var(--tf-font-mono);
  font-size: 1rem;
  color: var(--tf-muted);
  transition: transform var(--tf-duration-fast) var(--tf-ease-out);
}

.guide-toc-mobile[open] summary::after {
  transform: rotate(45deg);
}

.guide-toc-mobile nav {
  display: flex;
  flex-direction: column;
  counter-reset: gd-toc;
  padding: 0 var(--tf-space-5) var(--tf-space-4);
}

.guide-toc-mobile nav a {
  counter-increment: gd-toc;
  display: flex;
  gap: 0.6rem;
  padding: 0.4rem 0;
  font-size: var(--tf-text-sm);
  color: var(--tf-muted);
  text-decoration: none;
  border-top: 1px solid var(--tf-line-soft);
}

.guide-toc-mobile nav a::before {
  content: counter(gd-toc, decimal-leading-zero);
  font-family: var(--tf-font-mono);
  font-size: var(--tf-text-2xs);
  line-height: 1.9;
  color: var(--tf-amber-dark);
}

.guide-toc-mobile nav a:hover {
  color: var(--tf-teal-dark);
}

@media (max-width: 900px) {
  .guide-body {
    grid-template-columns: minmax(0, var(--gd-measure));
  }

  .guide-rail {
    display: none;
  }

  .guide-toc-mobile {
    display: block;
  }
}

/* Prose -------------------------------------------------------------------- */

.guide-content {
  counter-reset: gd-section gd-fig;
  min-width: 0;
}

.guide-content section {
  scroll-margin-top: calc(var(--gd-header-h) + 2rem);
}

.guide-content section + section {
  margin-top: clamp(3rem, 7vw, 4.5rem);
}

.guide-content h2 {
  position: relative;
  margin: 0 0 var(--tf-space-6);
  padding-top: var(--tf-space-6);
  border-top: 1px solid var(--tf-line-strong);
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: clamp(1.5rem, 1.3rem + 0.9vw, 1.9rem);
  font-weight: 580;
  line-height: 1.22;
  letter-spacing: -0.012em;
  text-wrap: balance;
  color: var(--tf-ink);
}

.guide-content h2::before {
  counter-increment: gd-section;
  content: counter(gd-section, decimal-leading-zero);
  position: absolute;
  top: -0.62em;
  left: 0;
  padding-right: 0.75rem;
  background: var(--tf-canvas);
  font-family: var(--tf-font-mono);
  font-size: var(--tf-text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--tf-amber-dark);
}

.guide-content h3 {
  margin: var(--tf-space-8) 0 var(--tf-space-4);
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: 1.3rem;
  font-weight: 580;
  line-height: 1.3;
  color: var(--tf-ink);
}

.guide-content h2 + h3 {
  margin-top: var(--tf-space-5);
}

.guide-content p {
  margin: 0 0 var(--tf-space-5);
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: var(--gd-prose-size);
  font-weight: 415;
  line-height: var(--gd-prose-leading);
  color: var(--gd-ink-prose);
  text-wrap: pretty;
}

.guide-content p:last-child {
  margin-bottom: 0;
}

.guide-content a {
  color: var(--tf-teal-dark);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--tf-teal) 45%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-color var(--tf-duration-fast) var(--tf-ease-out),
    background var(--tf-duration-fast) var(--tf-ease-out);
  border-radius: 2px;
}

.guide-content a:hover {
  text-decoration-color: var(--tf-teal);
  background: var(--tf-teal-tint);
}

.guide-content strong {
  font-weight: 620;
  color: var(--tf-ink);
}

.guide-content em {
  font-style: italic;
}

.guide-content code {
  font-family: var(--tf-font-mono);
  font-size: 0.82em;
  padding: 0.12em 0.4em;
  border-radius: var(--tf-radius-xs);
  background: var(--tf-canvas-strong);
  border: 1px solid var(--tf-line);
  color: var(--tf-ink-soft);
}

/* Heading anchor links (injected by guide.js) */

.gd-anchor {
  margin-left: 0.4em;
  font-family: var(--tf-font-body);
  font-size: 0.7em;
  font-weight: 500;
  color: var(--tf-quiet);
  text-decoration: none;
  opacity: 0;
  transition: opacity var(--tf-duration-fast) var(--tf-ease-out);
}

.guide-content h2:hover .gd-anchor,
.guide-content h3:hover .gd-anchor,
.gd-anchor:focus-visible {
  opacity: 1;
}

.gd-anchor:hover {
  color: var(--tf-teal);
  background: none;
}

/* Quick answer / key takeaway panel ----------------------------------------- */

.guide-answer {
  position: relative;
  margin: 0 0 var(--tf-space-6);
  padding: var(--tf-space-6) var(--tf-space-6) var(--tf-space-6) var(--tf-space-7);
  border-radius: var(--tf-radius-lg);
  background: var(--tf-teal-tint);
  border: 1px solid color-mix(in srgb, var(--tf-teal) 22%, transparent);
  overflow: hidden;
}

.guide-answer::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--tf-teal);
}

.guide-answer > p {
  font-size: 1.125rem;
  color: var(--tf-ink-soft);
}

.guide-answer-tag {
  display: inline-block;
  margin-bottom: var(--tf-space-3);
  font-family: var(--tf-font-body);
  font-size: var(--tf-text-2xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--tf-teal-dark);
}

/* Callouts ------------------------------------------------------------------ */

.guide-callout {
  margin: var(--tf-space-6) 0;
  padding: var(--tf-space-5) var(--tf-space-6);
  border-radius: var(--tf-radius-lg);
  border: 1px solid var(--tf-line-strong);
  background: var(--tf-paper);
  box-shadow: var(--tf-shadow-xs);
}

.guide-callout p {
  font-size: 1.0625rem;
  margin-bottom: var(--tf-space-3);
}

.guide-callout p:last-child {
  margin-bottom: 0;
}

.guide-callout-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: var(--tf-space-2);
  font-family: var(--tf-font-body);
  font-size: var(--tf-text-2xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--tf-amber-dark);
}

.guide-callout--warning {
  background: var(--tf-amber-tint);
  border-color: color-mix(in srgb, var(--tf-amber) 30%, transparent);
}

/* Pullquote ------------------------------------------------------------------ */

.guide-pullquote {
  margin: var(--tf-space-8) 0;
  padding-left: var(--tf-space-6);
  border-left: 3px solid var(--tf-amber);
}

.guide-pullquote p {
  font-size: 1.35rem;
  line-height: 1.5;
  font-style: italic;
  font-weight: 440;
  color: var(--tf-ink-soft);
}

/* Lists ------------------------------------------------------------------------ */

.guide-content ul:not([class]),
.guide-content ol:not([class]) {
  margin: 0 0 var(--tf-space-5);
  padding-left: 1.4rem;
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: var(--gd-prose-size);
  line-height: var(--gd-prose-leading);
  color: var(--gd-ink-prose);
}

.guide-content ul:not([class]) li,
.guide-content ol:not([class]) li {
  margin-bottom: var(--tf-space-2);
}

.guide-checklist,
.guide-warning-list {
  list-style: none;
  margin: 0 0 var(--tf-space-5);
  padding: 0;
}

.guide-checklist li,
.guide-warning-list li {
  position: relative;
  padding: 0.3rem 0 0.3rem 2.1rem;
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: 1.0938rem;
  line-height: 1.62;
  color: var(--gd-ink-prose);
}

.guide-checklist li::before,
.guide-warning-list li::before {
  position: absolute;
  left: 0;
  top: 0.42rem;
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--tf-font-body);
  font-size: 0.7rem;
  font-weight: 700;
}

.guide-checklist li::before {
  content: "\2713";
  background: var(--tf-teal-soft);
  color: var(--tf-teal-dark);
}

.guide-warning-list li::before {
  content: "\2715";
  background: var(--tf-coral-soft);
  color: var(--tf-coral);
}

/* Numbered steps */

.guide-steps {
  list-style: none;
  counter-reset: gd-step;
  margin: 0 0 var(--tf-space-5);
  padding: 0;
}

.guide-steps li {
  position: relative;
  counter-increment: gd-step;
  padding: 0.45rem 0 0.95rem 2.6rem;
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: 1.0938rem;
  line-height: 1.62;
  color: var(--gd-ink-prose);
}

.guide-steps li::before {
  content: counter(gd-step);
  position: absolute;
  left: 0;
  top: 0.45rem;
  width: 1.7rem;
  height: 1.7rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--tf-paper);
  border: 1px solid var(--tf-amber);
  color: var(--tf-amber-dark);
  font-family: var(--tf-font-mono);
  font-size: 0.78rem;
  font-weight: 600;
}

.guide-steps li::after {
  content: "";
  position: absolute;
  left: 0.82rem;
  top: 2.4rem;
  bottom: -0.1rem;
  width: 1px;
  background: var(--tf-line-strong);
}

.guide-steps li:last-child::after {
  display: none;
}

/* Tab-title specimen chips ------------------------------------------------------ */
/* Rendered as miniature browser tabs — a nod to what TitleFlash does. */

.guide-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--tf-space-3);
  margin: var(--tf-space-5) 0 var(--tf-space-6);
}

.guide-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.1rem 0.55rem 0.85rem;
  border: 1px solid var(--tf-line-strong);
  border-bottom-color: transparent;
  border-radius: 10px 10px 0 0;
  background: linear-gradient(180deg, var(--tf-paper-strong), var(--tf-paper));
  box-shadow: var(--tf-shadow-xs), inset 0 -6px 8px -8px rgba(34, 28, 16, 0.25);
  font-family: var(--tf-font-body);
  font-size: 0.8438rem;
  font-weight: 500;
  color: var(--tf-ink-soft);
  white-space: nowrap;
}

.guide-chip::before {
  content: "";
  flex: none;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  background: var(--tf-amber);
}

.guide-chips .guide-chip:nth-child(3n)::before {
  background: var(--tf-teal);
}

.guide-chips .guide-chip:nth-child(3n + 2)::before {
  background: var(--tf-coral);
}

/* Figures -------------------------------------------------------------------------- */

.guide-figure {
  margin: var(--tf-space-8) 0;
}

.guide-figure img {
  display: block;
  width: 100%;
  border-radius: var(--tf-radius-lg);
  border: 1px solid var(--tf-line-strong);
  background: var(--tf-paper);
  box-shadow: var(--tf-shadow-sm);
}

.guide-figure figcaption::before {
  counter-increment: gd-fig;
  content: "Fig. " counter(gd-fig, decimal-leading-zero) " — ";
  font-family: var(--tf-font-mono);
  font-size: var(--tf-text-2xs);
  letter-spacing: 0.05em;
  color: var(--tf-amber-dark);
}

/* Card grids -------------------------------------------------------------------------- */

.guide-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--tf-space-4);
  margin: var(--tf-space-6) 0;
}

.guide-cards--three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.guide-card-item {
  padding: var(--tf-space-5);
  border-radius: var(--tf-radius-lg);
  border: 1px solid var(--tf-line-strong);
  background: var(--tf-paper);
  box-shadow: var(--tf-shadow-xs);
}

.guide-card-item > span {
  display: inline-block;
  margin-bottom: var(--tf-space-3);
  font-family: var(--tf-font-body);
  font-size: var(--tf-text-2xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--tf-amber-dark);
}

.guide-card-item > strong {
  display: block;
  margin-bottom: var(--tf-space-2);
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--tf-ink);
}

.guide-card-item > p {
  margin: 0;
  font-family: var(--tf-font-body);
  font-size: var(--tf-text-sm);
  line-height: 1.6;
  color: var(--tf-muted);
}

@media (max-width: 720px) {
  .guide-cards,
  .guide-cards--three {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Compare: good vs poor --------------------------------------------------------------- */

.guide-compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--tf-space-4);
  margin: var(--tf-space-6) 0;
}

.guide-compare > div {
  padding: var(--tf-space-5) var(--tf-space-5) var(--tf-space-4);
  border-radius: var(--tf-radius-lg);
  border: 1px solid var(--tf-line-strong);
  background: var(--tf-paper);
}

.guide-compare > div > h3 {
  margin: 0 0 var(--tf-space-4);
  padding-bottom: var(--tf-space-3);
  border-bottom: 1px solid var(--tf-line);
  font-size: 1.05rem;
}

.guide-compare > div:first-child > h3 {
  color: var(--tf-success);
}

.guide-compare > div:last-child > h3 {
  color: var(--tf-danger);
}

.guide-compare .guide-checklist li,
.guide-compare .guide-warning-list li {
  font-size: 1rem;
  line-height: 1.55;
}

@media (max-width: 720px) {
  .guide-compare {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Tables ---------------------------------------------------------------------------------- */

.guide-table-wrap {
  margin: var(--tf-space-6) 0;
  border: 1px solid var(--tf-line-strong);
  border-radius: var(--tf-radius-lg);
  background: var(--tf-paper);
  box-shadow: var(--tf-shadow-xs);
  overflow-x: auto;
}

.guide-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--tf-font-body);
  font-size: 0.9063rem;
  line-height: 1.55;
}

.guide-table th {
  padding: var(--tf-space-4) var(--tf-space-5);
  text-align: left;
  font-size: var(--tf-text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--tf-muted);
  background: var(--tf-canvas-strong);
  border-bottom: 1px solid var(--tf-line-strong);
  white-space: nowrap;
}

.guide-table td {
  padding: var(--tf-space-4) var(--tf-space-5);
  vertical-align: top;
  color: var(--tf-ink-soft);
  border-bottom: 1px solid var(--tf-line-soft);
}

.guide-table tr:last-child td {
  border-bottom: 0;
}

.guide-table td:first-child {
  font-weight: 600;
  color: var(--tf-ink);
}

/* Code block -------------------------------------------------------------------------------- */

.guide-code-block {
  margin: var(--tf-space-6) 0;
  padding: var(--tf-space-5) var(--tf-space-6);
  border-radius: var(--tf-radius-lg);
  background: var(--tf-ink);
  color: #e9e4d6;
  font-family: var(--tf-font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
  overflow-x: auto;
  box-shadow: var(--tf-shadow-sm);
}

.guide-code-block code {
  all: unset;
  font-family: inherit;
  white-space: pre;
}

/* In-article CTA panel -------------------------------------------------------------------------- */

.guide-cta {
  position: relative;
  margin: var(--tf-space-8) 0 0;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  border-radius: var(--tf-radius-xl);
  background:
    radial-gradient(120% 160% at 85% -20%, rgba(200, 122, 8, 0.35), transparent 55%),
    var(--tf-teal-dark);
  color: var(--tf-paper);
  overflow: hidden;
}

.guide-cta::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 22px 22px;
}

.guide-cta > * {
  position: relative;
  z-index: 1;
}

.guide-cta h3 {
  margin: 0 0 var(--tf-space-3);
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: clamp(1.4rem, 1.2rem + 1vw, 1.8rem);
  font-weight: 560;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--tf-paper-strong);
  text-wrap: balance;
}

.guide-cta p {
  margin: 0 0 var(--tf-space-6);
  max-width: 34rem;
  font-family: var(--tf-font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: rgba(251, 247, 237, 0.82);
}

.guide-cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  border-radius: var(--tf-radius-pill);
  background: var(--tf-amber);
  color: #2c1c02;
  font-family: var(--tf-font-body);
  font-size: 1rem;
  font-weight: 650;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  transition: transform var(--tf-duration-fast) var(--tf-ease-out),
    background var(--tf-duration-fast) var(--tf-ease-out);
}

.guide-cta-button:hover {
  background: #e08c10;
  transform: translateY(-2px);
}

.guide-cta-button .gd-arrow {
  transition: transform var(--tf-duration-fast) var(--tf-ease-out);
}

.guide-cta-button:hover .gd-arrow {
  transform: translateX(3px);
}

/* End matter: sources, pager ------------------------------------------------------------------------ */

.guide-sources {
  margin-top: var(--tf-space-6);
  padding-top: var(--tf-space-5);
  border-top: 1px dashed var(--tf-line-strong);
}

.guide-sources p,
.guide-sources ul {
  margin: 0;
  font-family: var(--tf-font-body);
  font-size: var(--tf-text-sm);
  line-height: 1.7;
  color: var(--tf-muted);
}

.guide-sources ul {
  padding-left: 1.2rem;
}

.guide-sources li {
  margin-bottom: var(--tf-space-1);
}

/* CTA panel placed between sections (not nested in one) */
.guide-content section + .guide-cta {
  margin-top: clamp(3rem, 7vw, 4.5rem);
}

.guide-endmatter {
  max-width: 56rem;
  margin: clamp(3.5rem, 8vw, 5.5rem) auto 0;
}

.guide-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--tf-space-4);
  margin-top: var(--tf-space-6);
}

.guide-pager-card {
  display: flex;
  flex-direction: column;
  gap: var(--tf-space-2);
  padding: var(--tf-space-6);
  border-radius: var(--tf-radius-lg);
  border: 1px solid var(--tf-line-strong);
  background: var(--tf-paper);
  text-decoration: none;
  box-shadow: var(--tf-shadow-xs);
  transition: transform var(--tf-duration-base) var(--tf-ease-out),
    box-shadow var(--tf-duration-base) var(--tf-ease-out),
    border-color var(--tf-duration-base) var(--tf-ease-out);
}

.guide-pager-card:hover {
  transform: translateY(-3px);
  border-color: var(--tf-teal);
  box-shadow: var(--tf-shadow-md);
}

.guide-pager-card span {
  font-family: var(--tf-font-body);
  font-size: var(--tf-text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--tf-muted-soft);
}

.guide-pager-card strong {
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: 1.1rem;
  font-weight: 580;
  line-height: 1.35;
  color: var(--tf-ink);
}

.guide-pager-card--next {
  text-align: right;
  align-items: flex-end;
}

@media (max-width: 720px) {
  .guide-pager {
    grid-template-columns: minmax(0, 1fr);
  }

  .guide-pager-card--next {
    text-align: left;
    align-items: flex-start;
  }
}

/* Guides index ------------------------------------------------------------------------------------------ */

.guide-index-hero {
  max-width: 46rem;
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5rem) 0 clamp(2.5rem, 6vw, 4rem);
  text-align: center;
}

.guide-index-hero .guide-kicker {
  margin-top: 0;
}

.guide-index-hero h1 {
  margin: var(--tf-space-4) 0 0;
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: clamp(2.3rem, 1.5rem + 3.4vw, 3.6rem);
  font-weight: 560;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.guide-index-hero p {
  margin: var(--tf-space-5) auto 0;
  max-width: 34rem;
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--tf-muted);
}

.guide-index-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--tf-space-5);
  max-width: 64rem;
  margin: 0 auto;
}

.guide-index-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--tf-space-3);
  padding: var(--tf-space-8) var(--tf-space-7);
  border-radius: var(--tf-radius-xl);
  border: 1px solid var(--tf-line-strong);
  background: var(--tf-paper);
  text-decoration: none;
  box-shadow: var(--tf-shadow-xs);
  transition: transform var(--tf-duration-base) var(--tf-ease-out),
    box-shadow var(--tf-duration-base) var(--tf-ease-out),
    border-color var(--tf-duration-base) var(--tf-ease-out);
}

.guide-index-card:hover {
  transform: translateY(-4px);
  border-color: var(--tf-teal);
  box-shadow: var(--tf-shadow-md);
}

.guide-index-card--featured {
  grid-column: 1 / -1;
  background:
    radial-gradient(110% 180% at 90% -30%, rgba(200, 122, 8, 0.32), transparent 50%),
    var(--tf-teal-dark);
  border-color: var(--tf-teal-dark);
}

.guide-index-card-label {
  font-family: var(--tf-font-body);
  font-size: var(--tf-text-2xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--tf-amber-dark);
}

.guide-index-card--featured .guide-index-card-label {
  color: var(--tf-amber-soft);
}

.guide-index-card h2 {
  margin: 0;
  font-family: var(--tf-font-display);
  font-optical-sizing: auto;
  font-size: 1.45rem;
  font-weight: 580;
  line-height: 1.25;
  letter-spacing: -0.01em;
  text-wrap: balance;
  color: var(--tf-ink);
}

.guide-index-card--featured h2 {
  font-size: clamp(1.7rem, 1.4rem + 1.4vw, 2.3rem);
  color: var(--tf-paper-strong);
  max-width: 36rem;
}

.guide-index-card p {
  margin: 0;
  font-family: var(--tf-font-body);
  font-size: var(--tf-text-sm);
  line-height: 1.65;
  color: var(--tf-muted);
}

.guide-index-card--featured p {
  color: rgba(251, 247, 237, 0.8);
  font-size: 1rem;
  max-width: 34rem;
}

.guide-index-card-link {
  margin-top: auto;
  padding-top: var(--tf-space-3);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--tf-font-body);
  font-size: var(--tf-text-sm);
  font-weight: 600;
  color: var(--tf-teal-dark);
}

.guide-index-card--featured .guide-index-card-link {
  color: var(--tf-amber-soft);
}

.guide-index-card-link .gd-arrow {
  transition: transform var(--tf-duration-fast) var(--tf-ease-out);
}

.guide-index-card:hover .guide-index-card-link .gd-arrow {
  transform: translateX(4px);
}

@media (max-width: 760px) {
  .guide-index-list {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Site footer ------------------------------------------------------------------------------------------- */

.guide-site-footer {
  margin-top: var(--tf-space-16);
  border-top: 1px solid var(--tf-line);
  background: var(--tf-canvas-strong);
}

.guide-footer-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: var(--tf-space-10) var(--gd-gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--tf-space-6);
}

.guide-footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--tf-space-2) var(--tf-space-5);
}

.guide-footer-nav a {
  font-size: var(--tf-text-sm);
  font-weight: 500;
  color: var(--tf-muted);
  text-decoration: none;
}

.guide-footer-nav a:hover {
  color: var(--tf-teal-dark);
}

.guide-footer-copy {
  margin: 0 0 0 auto;
  font-size: var(--tf-text-xs);
  color: var(--tf-muted-soft);
}

@media (max-width: 720px) {
  .guide-footer-copy {
    margin-left: 0;
  }
}

/* Print --------------------------------------------------------------------------------------------------- */

@media print {
  body.guide-page::before,
  .guide-progress,
  .guide-site-header,
  .guide-rail,
  .guide-toc-mobile,
  .guide-cta,
  .guide-pager,
  .guide-site-footer {
    display: none !important;
  }

  .guide-body {
    grid-template-columns: minmax(0, 1fr);
  }

  .guide-content section + section {
    margin-top: 2rem;
  }

  .guide-content a {
    color: inherit;
    text-decoration: none;
  }
}