.page-standards {
  --std-rail-width: 16rem;
  --std-node-size: 14px;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

/* ---------- 面包屑 ---------- */
.page-standards .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-3);
}

.page-standards .crumbs a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-standards .crumbs a:hover,
.page-standards .crumbs a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- 首屏 ---------- */
.page-standards .journey-hero {
  padding: var(--space-3) 0 var(--space-6);
  background-image:
    radial-gradient(90% 70% at 92% 4%, color-mix(in srgb, var(--color-primary) 22%, transparent) 0%, transparent 62%),
    radial-gradient(70% 60% at 2% 100%, color-mix(in srgb, var(--color-accent) 10%, transparent) 0%, transparent 58%);
}

.page-standards .journey-hero__frame {
  position: relative;
  padding: var(--space-4) var(--space-3) var(--space-6);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 62%, transparent);
  border-radius: var(--radius-lg);
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--color-primary) 20%, transparent),
    0 0 34px color-mix(in srgb, var(--color-primary) 16%, transparent);
  background-image: linear-gradient(180deg, color-mix(in srgb, var(--color-surface-deep) 55%, transparent) 0%, color-mix(in srgb, var(--color-surface-alt) 72%, transparent) 100%);
}

.page-standards .journey-hero__tag {
  display: inline-block;
  margin: 0 0 var(--space-3);
  padding: 4px var(--space-2);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 55%, transparent);
  border-radius: var(--radius-pill);
  color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary-soft) 60%, transparent);
}

.page-standards .journey-hero__title {
  margin: 0 0 var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

.page-standards .journey-hero__cols {
  display: grid;
  gap: var(--space-4);
}

.page-standards .journey-hero__lede p {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  color: var(--color-ink-soft);
}

.page-standards .journey-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  margin: var(--space-4) 0 0;
  padding: var(--space-4) 0 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-standards .journey-facts__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-standards .journey-facts__num {
  font-family: var(--font-mono);
  font-size: calc(var(--text-figure) * 0.5);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.page-standards .journey-facts__label {
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-standards .journey-hero__media {
  margin: 0;
}

.page-standards .figure__img {
  display: block;
  max-width: 100%;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-standards .figure__cap {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

/* ---------- 横向刻度旅程带 ---------- */
.page-standards .journey-scale {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thick) solid var(--color-line);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-standards .journey-scale__track {
  position: relative;
  display: flex;
  gap: var(--space-2);
  min-width: 780px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-standards .journey-scale__track::before {
  content: "";
  position: absolute;
  left: 5%;
  right: 5%;
  top: calc(var(--std-node-size) / 2);
  height: var(--border-thin);
  background-image: linear-gradient(90deg, transparent 0%, var(--color-primary) 12%, var(--color-primary) 88%, transparent 100%);
  opacity: 0.7;
}

.page-standards .journey-scale__item {
  flex: 1 1 0;
  min-width: 132px;
}

.page-standards .journey-scale__node {
  display: grid;
  justify-items: center;
  gap: var(--space-1);
  padding: 0 var(--space-1) var(--space-1);
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  transition: color 180ms ease, transform 180ms ease;
}

.page-standards .journey-scale__dot {
  position: relative;
  z-index: 1;
  width: var(--std-node-size);
  height: var(--std-node-size);
  border: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  box-shadow: 0 0 12px color-mix(in srgb, var(--color-primary) 55%, transparent);
  transition: background-color 180ms ease, border-color 180ms ease;
}

.page-standards .journey-scale__no {
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-primary);
}

.page-standards .journey-scale__name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-standards .journey-scale__time {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-standards .journey-scale__node:hover,
.page-standards .journey-scale__node:focus-visible {
  color: var(--color-accent);
  transform: translateY(-2px);
}

.page-standards .journey-scale__node:hover .journey-scale__dot,
.page-standards .journey-scale__node:focus-visible .journey-scale__dot {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.page-standards .journey-scale__node:hover .journey-scale__time,
.page-standards .journey-scale__node:focus-visible .journey-scale__time {
  color: var(--color-accent);
}

/* ---------- 主体：单栏深读 + 侧栏索引 ---------- */
.page-standards .journey-body {
  padding: var(--section-y) 0;
}

.page-standards .journey-layout {
  display: grid;
  gap: var(--space-6);
}

.page-standards .journey-main {
  min-width: 0;
}

.page-standards .step {
  position: relative;
  padding-top: var(--space-6);
  margin-top: var(--space-6);
  scroll-margin-top: calc(var(--space-8) + var(--space-4));
}

.page-standards .step:first-child {
  margin-top: 0;
  padding-top: var(--space-4);
}

.page-standards .step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-top: var(--border-thick) solid var(--color-line);
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 48%, transparent);
}

.page-standards .step__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  margin-bottom: var(--space-4);
}

.page-standards .step__no {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.page-standards .step__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-standards .step__meta {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-standards .step__body p {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  color: var(--color-ink);
}

.page-standards .step__body p:last-child {
  margin-bottom: 0;
}

.page-standards .step__figure {
  margin: var(--space-4) 0 0;
}

.page-standards .step__asks {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  list-style: none;
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: color-mix(in srgb, var(--color-surface-alt) 82%, transparent);
}

.page-standards .step__asks li {
  color: var(--color-ink-soft);
}

.page-standards .step__asks .mono {
  display: inline-block;
  min-width: 4.5em;
  margin-right: var(--space-2);
  color: var(--color-primary);
  letter-spacing: 0.1em;
}

.page-standards .step__gain {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-left: var(--border-thick) solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: color-mix(in srgb, var(--color-surface-alt) 88%, transparent);
}

.page-standards .step__gain-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

.page-standards .step__gain ul {
  display: grid;
  gap: 4px;
  margin: 0;
  padding-left: 1.1em;
  list-style: square;
  color: var(--color-ink-soft);
}

.page-standards .step__next {
  margin: var(--space-4) 0 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-standards .step__next a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 55%, transparent);
  transition: border-color 160ms ease, color 160ms ease;
}

.page-standards .step__next a:hover,
.page-standards .step__next a:focus-visible {
  color: var(--color-focus);
  border-bottom-color: var(--color-focus);
}

/* ---------- 侧栏索引 ---------- */
.page-standards .journey-rail {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-surface-alt) 70%, transparent);
}

.page-standards .journey-rail__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-standards .journey-rail ol {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-standards .journey-rail a {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border-left: var(--border-thick) solid transparent;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.page-standards .journey-rail a .mono {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.page-standards .journey-rail a:hover,
.page-standards .journey-rail a:focus-visible {
  color: var(--color-ink);
  border-left-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary-soft) 62%, transparent);
}

.page-standards .journey-rail a[aria-current="true"] {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-highlight) 78%, transparent);
}

.page-standards .journey-rail a[aria-current="true"] .mono {
  color: var(--color-accent);
}

.page-standards .journey-rail__note {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

/* ---------- 交付物表格区 ---------- */
.page-standards .deliverables {
  padding: var(--section-y) 0;
  border-top: var(--border-thick) solid var(--color-line);
  border-bottom: var(--border-thick) solid var(--color-line);
  background: var(--color-surface-alt);
}

.page-standards .section-head {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.page-standards .section-head__no {
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.page-standards .section-head__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-standards .section-head__note {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-standards .table-scroll {
  overflow-x: auto;
}

.page-standards .table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  text-align: left;
}

.page-standards .table th,
.page-standards .table td {
  padding: var(--space-3) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: top;
}

.page-standards .table thead th {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  border-bottom: var(--border-thick) solid var(--color-primary);
  white-space: nowrap;
}

.page-standards .table tbody td {
  color: var(--color-ink-soft);
}

.page-standards .table tbody td:first-child {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--color-accent);
  white-space: nowrap;
}

.page-standards .table tbody tr {
  transition: background-color 160ms ease;
}

.page-standards .table tbody tr:hover,
.page-standards .table tbody tr:focus-within {
  background: var(--color-highlight);
}

/* ---------- 收尾出口 ---------- */
.page-standards .journey-out {
  padding: var(--section-y) 0;
}

.page-standards .journey-out__panel {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-6) var(--space-4);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 55%, transparent);
  border-radius: var(--radius-lg);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-accent) 18%, transparent);
  background-image: linear-gradient(120deg, color-mix(in srgb, var(--color-surface-deep) 58%, transparent) 0%, color-mix(in srgb, var(--color-surface) 92%, transparent) 100%);
}

.page-standards .journey-out__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-standards .journey-out__text p {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-standards .journey-out__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

.page-standards a:focus-visible,
.page-standards button:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 520px) {
  .page-standards .journey-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-standards .journey-hero {
    padding: var(--space-4) 0 var(--space-8);
  }

  .page-standards .journey-hero__frame {
    padding: var(--space-6) var(--space-6) var(--space-8);
  }

  .page-standards .journey-hero__cols {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: center;
  }

  .page-standards .step__title {
    font-size: var(--text-xl);
  }

  .page-standards .section-head {
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--space-4);
    align-items: start;
    margin-bottom: var(--space-8);
  }

  .page-standards .section-head__title {
    font-size: var(--text-2xl);
  }

  .page-standards .journey-out__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    padding: var(--space-8) var(--space-6);
  }

  .page-standards .journey-out__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-standards .journey-layout {
    grid-template-columns: minmax(0, 1fr) var(--std-rail-width);
    gap: var(--space-8);
    align-items: start;
  }

  .page-standards .journey-rail {
    position: sticky;
    top: calc(var(--space-8) + var(--space-4));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-standards .journey-scale__node,
  .page-standards .journey-rail a,
  .page-standards .table tbody tr {
    transition: none;
  }

  .page-standards .journey-scale__node:hover,
  .page-standards .journey-scale__node:focus-visible {
    transform: none;
  }
}