.page-guides-basic {
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  overflow-x: hidden;
}

.page-guides-basic img {
  max-width: 100%;
  height: auto;
}

.page-guides-basic .gb-layout {
  max-width: calc(var(--container) + var(--space-6));
  margin-inline: auto;
  padding-inline: var(--space-3);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.page-guides-basic .gb-main {
  min-width: 0;
}

/* ---------- 面包屑与页头 ---------- */

.page-guides-basic .gb-crumbs {
  padding-top: var(--space-4);
  font-size: var(--text-sm);
}

.page-guides-basic .gb-head {
  padding-block: var(--space-6) var(--space-6);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

.page-guides-basic .gb-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin: var(--space-3) 0 var(--space-3);
  max-width: 22ch;
}

.page-guides-basic .gb-lede {
  margin: 0;
  font-size: var(--text-lg);
  line-height: 1.45;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-guides-basic .gb-facts {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--border-thin);
  background: var(--color-line);
  border: var(--border-thin) solid var(--color-line);
}

.page-guides-basic .gb-facts li {
  background: var(--color-surface);
  padding: var(--space-2) var(--space-3);
}

.page-guides-basic .gb-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.05;
  color: var(--color-primary);
}

.page-guides-basic .gb-facts__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ---------- 通用分区 ---------- */

.page-guides-basic .gb-section {
  padding-block: var(--space-8);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-guides-basic .gb-section--last {
  border-bottom: none;
  padding-bottom: var(--space-8);
}

.page-guides-basic .gb-section .section-head {
  margin-bottom: var(--space-4);
}

.page-guides-basic .gb-prose p {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
}

.page-guides-basic .gb-prose p:last-child {
  margin-bottom: 0;
}

.page-guides-basic .gb-note-line {
  margin: 0 0 var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: var(--measure);
}

/* ---------- 场景问题清单 ---------- */

.page-guides-basic .gb-uses {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--border-thin);
  background: var(--color-line);
  border: var(--border-thin) solid var(--color-line);
}

.page-guides-basic .gb-uses li {
  background: var(--color-surface);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-base);
}

.page-guides-basic .gb-uses__q {
  display: inline-block;
  min-width: 3.6em;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  letter-spacing: 0.1em;
}

/* ---------- 媒体位 ---------- */

.page-guides-basic .gb-figure {
  margin: 0 0 var(--space-6);
}

.page-guides-basic .gb-figure .media-frame__body {
  font-size: var(--text-sm);
  line-height: 1.5;
}

.page-guides-basic .gb-field__fig {
  margin: var(--space-3) 0 0;
}

.page-guides-basic .gb-scene__fig {
  margin: var(--space-3) 0 0;
}

/* ---------- 字段数据流 ---------- */

.page-guides-basic .gb-fields {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--border-thin);
  background: var(--color-line);
  border: var(--border-thin) solid var(--color-line);
}

.page-guides-basic .gb-field {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  background: var(--color-surface);
}

.page-guides-basic .gb-field__num {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-3);
  background: var(--color-surface-deep);
}

.page-guides-basic .gb-field__figure {
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-ink);
  transition: color 200ms ease;
}

.page-guides-basic .gb-field__unit {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-guides-basic .gb-field__text {
  padding: var(--space-3);
  background: var(--color-surface);
}

.page-guides-basic .gb-field:nth-child(even) .gb-field__text {
  background: var(--color-surface-alt);
}

.page-guides-basic .gb-field__name {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.2;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-guides-basic .gb-field__def,
.page-guides-basic .gb-field__read,
.page-guides-basic .gb-field__trap {
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  max-width: var(--measure);
}

.page-guides-basic .gb-field__trap {
  margin-bottom: 0;
  color: var(--color-ink-soft);
}

.page-guides-basic .gb-field__key {
  display: inline-block;
  min-width: 4.4em;
  margin-right: var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-accent);
  vertical-align: baseline;
}

.page-guides-basic .gb-field__trap .gb-field__key {
  color: var(--color-primary);
}

.page-guides-basic .gb-field:hover .gb-field__figure,
.page-guides-basic .gb-field:has(.gb-field__name:hover) .gb-field__figure {
  color: var(--color-accent);
}

.page-guides-basic .gb-field:hover .gb-field__num {
  background: var(--color-highlight);
}

/* ---------- 场景卡 ---------- */

.page-guides-basic .gb-scenes {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.page-guides-basic .gb-scene {
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
}

.page-guides-basic .gb-scene__head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  transition: background-color 200ms ease;
}

.page-guides-basic .gb-scene__head::-webkit-details-marker {
  display: none;
}

.page-guides-basic .gb-scene__head:hover {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
}

.page-guides-basic .gb-scene__index {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  opacity: 0.82;
}

.page-guides-basic .gb-scene__name {
  font-size: var(--text-base);
}

.page-guides-basic .gb-scene__time {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  opacity: 0.86;
}

.page-guides-basic .gb-scene__toggle {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  border: var(--border-thin) solid currentColor;
}

.page-guides-basic .gb-scene__toggle::before,
.page-guides-basic .gb-scene__toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: currentColor;
}

.page-guides-basic .gb-scene__toggle::before {
  width: 7px;
  height: var(--border-thin);
  transform: translate(-50%, -50%);
}

.page-guides-basic .gb-scene__toggle::after {
  width: var(--border-thin);
  height: 7px;
  transform: translate(-50%, -50%);
  transition: transform 200ms ease;
}

.page-guides-basic .gb-scene[open] .gb-scene__toggle::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-guides-basic .gb-scene__body {
  padding: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
}

.page-guides-basic .gb-steps {
  list-style: none;
  counter-reset: gb-step;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.page-guides-basic .gb-steps li {
  counter-increment: gb-step;
  display: grid;
  grid-template-columns: 2.6em minmax(0, 1fr);
  align-items: baseline;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-base);
}

.page-guides-basic .gb-steps li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-guides-basic .gb-steps li::before {
  content: counter(gb-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.page-guides-basic .gb-steps a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: var(--border-thin);
  text-underline-offset: 3px;
}

.page-guides-basic .gb-steps a:hover {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  text-decoration: none;
}

/* ---------- 边界说明 ---------- */

.page-guides-basic .gb-edges {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--border-thin);
  background: var(--color-line);
  border: var(--border-thin) solid var(--color-line);
}

.page-guides-basic .gb-edge {
  background: var(--color-surface);
  padding: var(--space-3);
}

.page-guides-basic .gb-edge dt {
  position: relative;
  margin-bottom: var(--space-2);
  padding-left: var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: 1.35;
  color: var(--color-ink);
}

.page-guides-basic .gb-edge dt::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
}

.page-guides-basic .gb-edge dd {
  margin: 0;
  padding-left: var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 分工对照 ---------- */

.page-guides-basic .gb-compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--border-thin);
  background: var(--color-line);
  border: var(--border-thin) solid var(--color-line);
}

.page-guides-basic .gb-compare__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface);
}

.page-guides-basic .gb-compare__item--self {
  background: var(--color-highlight);
}

.page-guides-basic .gb-compare__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.page-guides-basic .gb-compare__item--self .gb-compare__tag {
  color: var(--color-primary);
}

.page-guides-basic .gb-compare__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.2;
  letter-spacing: var(--tracking-heading);
}

.page-guides-basic .gb-compare__body {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.page-guides-basic .gb-compare__where {
  margin: auto 0 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-guides-basic .gb-compare__link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thick) solid var(--color-primary);
  padding-bottom: 2px;
  transition: color 200ms ease, border-color 200ms ease;
}

.page-guides-basic .gb-compare__link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ---------- 深底出口 ---------- */

.page-guides-basic .gb-dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-sm);
}

.page-guides-basic .gb-dark__eyebrow {
  color: var(--color-contrast-accent);
}

.page-guides-basic .gb-dark__title {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-guides-basic .gb-dark__body {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  font-size: var(--text-base);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

.page-guides-basic .gb-dark__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ---------- 右侧常显导航 ---------- */

.page-guides-basic .gb-rail {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-guides-basic .gb-rail__back {
  align-self: flex-start;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thick) solid var(--color-primary);
  padding-bottom: 2px;
  transition: color 200ms ease, border-color 200ms ease;
}

.page-guides-basic .gb-rail__back:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.page-guides-basic .gb-rail__toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-guides-basic .gb-rail__toc a {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  padding-block: 2px;
  border-left: var(--border-thin) solid var(--color-line);
  padding-left: var(--space-2);
  transition: color 200ms ease, border-color 200ms ease;
}

.page-guides-basic .gb-rail__toc a:hover {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

/* ---------- 焦点可达 ---------- */

.page-guides-basic a:focus-visible,
.page-guides-basic summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-guides-basic .gb-title {
    font-size: var(--text-2xl);
  }

  .page-guides-basic .gb-field {
    grid-template-columns: 190px minmax(0, 1fr);
  }

  .page-guides-basic .gb-field__num {
    border-right: var(--border-thin) solid var(--color-line);
  }

  .page-guides-basic .gb-scene__head {
    width: 60%;
  }

  .page-guides-basic .gb-edges {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-guides-basic .gb-compare {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-guides-basic .gb-dark {
    padding: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .page-guides-basic .gb-layout {
    max-width: calc(var(--container) + var(--space-8) * 2);
    grid-template-columns: minmax(0, 1fr) 216px;
  }

  .page-guides-basic .gb-rail {
    position: sticky;
    top: var(--space-6);
    align-self: start;
    padding-top: 0;
    border-top: none;
    border-left: var(--border-thin) solid var(--color-line);
    padding-left: var(--space-3);
  }

  .page-guides-basic .gb-head {
    padding-block: var(--space-8) var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-guides-basic * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
<<<PAGE_CSS_END>>>