/* ==========================================================
   对照标准 /standards/  —— 页面专属样式
   全部选择器限定在 .page-standards 作用域内
   ========================================================== */

.page-standards {
  overflow-x: hidden;
}

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

/* ---------- 面包屑留白 ---------- */
.page-standards .breadcrumb {
  margin-top: var(--space-3);
}

/* ==========================================================
   首屏
   ========================================================== */

.page-standards .std-hero {
  position: relative;
  overflow: hidden;
  margin-block: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-standards .std-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-standards .std-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
}

.page-standards .std-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-standards .std-hero__inner {
  position: relative;
  z-index: 1;
  padding: var(--space-6) var(--space-3);
}

.page-standards .std-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-contrast-accent);
}

.page-standards .std-hero__title {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.94;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-standards .std-hero__lede {
  max-width: var(--measure);
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent);
}

.page-standards .std-hero__status {
  display: inline-block;
  margin: var(--space-3) 0 0;
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
}

/* ---------- 大字号编号带 ---------- */

.page-standards .std-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.page-standards .std-band__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-contrast-surface) 58%, transparent);
  color: inherit;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.page-standards .std-band__item:hover,
.page-standards .std-band__item:focus-visible {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-contrast-surface) 70%, var(--color-primary));
}

.page-standards .std-band__item:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: var(--space-1);
}

.page-standards .std-band__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.86;
  letter-spacing: -0.03em;
  color: var(--color-contrast-ink);
}

.page-standards .std-band__label {
  flex: 0 1 auto;
  min-width: 0;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.page-standards .std-band__item .std-lamp {
  margin-left: auto;
}

/* ==========================================================
   状态灯
   ========================================================== */

.page-standards .std-lamp {
  flex: none;
  display: inline-block;
  width: var(--space-1);
  height: var(--space-1);
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  box-shadow: 0 0 0 calc(var(--space-1) / 2) color-mix(in srgb, var(--color-primary) 22%, transparent);
}

.page-standards .std-band__item .std-lamp {
  background: var(--color-contrast-accent);
  box-shadow: 0 0 0 calc(var(--space-1) / 2) color-mix(in srgb, var(--color-contrast-accent) 24%, transparent);
}

@keyframes std-lamp-breathe {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.page-standards .std-band__item:hover .std-lamp,
.page-standards .std-band__item:focus-visible .std-lamp,
.page-standards .std-rule:hover .std-lamp,
.page-standards .std-rule:focus-within .std-lamp {
  animation: std-lamp-breathe 2.4s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .page-standards .std-lamp {
    animation: none !important;
  }
  .page-standards .std-band__item,
  .page-standards .std-outro__link {
    transition: none;
  }
}

/* ==========================================================
   标准条堆叠区
   ========================================================== */

.page-standards .std-stack {
  display: block;
}

.page-standards .std-rule {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2) var(--space-3);
  padding-block: var(--space-6);
  border-top: var(--border-thin) dotted var(--color-line);
}

.page-standards .std-rule:last-of-type {
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.page-standards .std-rule__num {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-primary);
}

.page-standards .std-rule__lamp {
  grid-column: 2;
  justify-self: end;
  align-self: start;
  margin-top: var(--space-2);
}

.page-standards .std-rule__body {
  grid-column: 1 / -1;
  min-width: 0;
}

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

.page-standards .std-rule__lede {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

/* ---------- 难处 / 做法 / 拿到什么 ---------- */

.page-standards .std-beats {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.page-standards .std-beat {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
}

.page-standards .std-beat__key {
  margin: 0;
  align-self: start;
  justify-self: start;
  padding: 0 var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  line-height: 2;
  color: var(--color-primary);
}

.page-standards .std-beat__val {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-standards .std-beat__val a {
  color: var(--color-primary);
}

/* ---------- 关键数字 ---------- */

.page-standards .std-signal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
  margin: var(--space-4) 0 0;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
}

.page-standards .std-signal__fig {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.page-standards .std-signal__unit {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
}

.page-standards .std-signal__note {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 图文双栏 ---------- */

.page-standards .std-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-standards .std-split__text {
  min-width: 0;
}

.page-standards .std-figure {
  margin: 0;
}

.page-standards .std-figure img {
  width: 100%;
  border-radius: var(--radius-sm);
}

/* ---------- 批注 ---------- */

.page-standards .std-note {
  display: inline-block;
  position: relative;
  font-size: var(--text-sm);
  color: var(--color-primary);
  border-bottom: var(--border-thin) dotted var(--color-primary);
  cursor: help;
}

.page-standards .std-note:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: var(--space-1);
}

.page-standards .std-note__key {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.page-standards .std-note__body {
  display: block;
  margin-top: var(--space-1);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  font-size: var(--text-xs);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 指标表 ---------- */

.page-standards .std-table-wrap {
  margin-top: var(--space-6);
  padding: var(--space-2) var(--space-3) var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  overflow-x: auto;
}

.page-standards .std-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-standards .std-table caption {
  padding: var(--space-2) 0;
  text-align: start;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

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

.page-standards .std-table thead th {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.page-standards .std-table tbody th {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  white-space: nowrap;
  color: var(--color-ink);
}

.page-standards .std-table tbody tr:last-child th,
.page-standards .std-table tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 胶囊标签 ---------- */

.page-standards .std-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-3);
}

.page-standards .std-chip {
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  white-space: nowrap;
  color: var(--color-primary);
}

/* ==========================================================
   纠错面板
   ========================================================== */

.page-standards .std-fixup {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-block: var(--section-y);
  padding: var(--space-6) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  overflow: hidden;
}

.page-standards .std-fixup__media {
  margin: 0;
}

.page-standards .std-fixup__media img {
  width: 100%;
  border-radius: var(--radius-sm);
}

.page-standards .std-fixup__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-contrast-accent);
}

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

.page-standards .std-fixup__lede {
  max-width: var(--measure);
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent);
}

.page-standards .std-checklist {
  list-style: none;
  display: grid;
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-standards .std-checklist li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

.page-standards .std-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: var(--space-1);
  height: var(--space-1);
  border-radius: var(--radius-pill);
  background: var(--color-contrast-accent);
}

.page-standards .std-fixup__channels {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-2);
  margin: var(--space-4) 0 0;
}

.page-standards .std-fixup__mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-contrast-ink);
  word-break: break-all;
}

.page-standards .std-fixup__sep {
  color: var(--color-contrast-line);
}

.page-standards .std-fixup__note {
  max-width: var(--measure);
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

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

/* ==========================================================
   收尾出口
   ========================================================== */

.page-standards .std-outro {
  padding-block: var(--section-y);
}

.page-standards .std-outro__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-standards .std-outro__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.page-standards .std-outro__link {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: inherit;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.page-standards .std-outro__link:hover,
.page-standards .std-outro__link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.page-standards .std-outro__link:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: var(--space-1);
}

.page-standards .std-outro__link-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}

.page-standards .std-outro__link-desc {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ==========================================================
   断点
   ========================================================== */

@media (min-width: 640px) {
  .page-standards .std-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-standards .std-beat {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: var(--space-2);
    align-items: start;
  }

  .page-standards .std-outro__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-standards .std-hero__inner {
    padding: var(--space-8) var(--space-8) var(--space-6);
  }

  .page-standards .std-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-standards .std-rule {
    grid-template-columns: 150px minmax(0, 1fr) var(--space-4);
    gap: var(--space-4) var(--space-6);
    padding-block: var(--section-y);
  }

  .page-standards .std-rule__num {
    grid-column: 1;
    grid-row: 1;
  }

  .page-standards .std-rule__body {
    grid-column: 2;
    grid-row: 1;
  }

  .page-standards .std-rule__lamp {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
  }

  .page-standards .std-rule:nth-of-type(even) {
    padding-left: var(--space-6);
  }

  .page-standards .std-fixup {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
    gap: var(--space-8);
    padding: var(--space-8);
    align-items: center;
  }

  .page-standards .std-fixup__media {
    align-self: stretch;
    display: flex;
  }

  .page-standards .std-fixup__media img {
    height: 100%;
    object-fit: cover;
  }
}

@media (min-width: 1024px) {
  .page-standards .std-split {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-standards .std-split--flip {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  }

  .page-standards .std-rule__lede,
  .page-standards .std-rule__body > .std-rule__lede {
    max-width: var(--measure);
  }

  .page-standards .std-note__body {
    position: absolute;
    left: 0;
    top: calc(100% + var(--space-1));
    z-index: 2;
    width: min(320px, 60vw);
    margin-top: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 160ms ease, visibility 160ms ease;
    box-shadow: var(--shadow-2);
  }

  .page-standards .std-note:hover .std-note__body,
  .page-standards .std-note:focus-visible .std-note__body,
  .page-standards .std-note:focus-within .std-note__body {
    opacity: 1;
    visibility: visible;
  }
}