.page-about {
  --ab-line: var(--edge);
  padding-bottom: clamp(40px, 8vw, 88px);
}

/* ---------- 顶部导语 ---------- */
.page-about .ab-intro {
  padding: clamp(20px, 4vw, 36px) 0 clamp(26px, 4.5vw, 44px);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-intro__eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--electric);
  text-transform: uppercase;
}

.page-about .ab-intro__title {
  margin: 0 0 18px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(29px, 6.2vw, 54px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--fg);
  max-width: 16ch;
}

.page-about .ab-intro__lead {
  margin: 0;
  max-width: 68ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--fg-mid);
}

.page-about .ab-facts {
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-facts__item {
  background: var(--surface);
  padding: 14px 16px 16px;
  min-width: 0;
}

.page-about .ab-facts__num {
  display: block;
  margin: 0;
  font-size: clamp(23px, 3.6vw, 32px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--orange);
}

.page-about .ab-facts__label {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg-mid);
}

/* ---------- 双栏骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  padding-top: clamp(28px, 5vw, 48px);
}

.page-about .ab-layout__main {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  scroll-margin-top: 88px;
}

.page-about .ab-sec + .ab-sec {
  margin-top: clamp(40px, 6vw, 64px);
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-sec__idx {
  flex: none;
  font-size: clamp(20px, 3.2vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-sec__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(20px, 3.2vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.page-about .ab-sec__lead,
.page-about .ab-sec__body p {
  max-width: 68ch;
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--fg-mid);
}

.page-about .ab-sec__lead {
  margin-top: 20px;
  font-size: clamp(15px, 1.7vw, 17px);
  color: var(--fg);
}

.page-about .ab-sec__body a,
.page-about .ab-note a,
.page-about .ab-side__note a,
.page-about .ab-flow__body a {
  color: var(--electric);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .ab-sec__body a:hover,
.page-about .ab-note a:hover,
.page-about .ab-side__note a:hover,
.page-about .ab-flow__body a:hover {
  color: var(--orange);
}

/* ---------- 图片 ---------- */
.page-about .ab-shot {
  margin: 22px 0 0;
  border: 1px solid var(--ab-line);
  background: var(--surface);
  overflow: hidden;
}

.page-about .ab-shot .ky-media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .ab-shot .ky-media__cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--ab-line);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--fg-dim);
}

.page-about .ab-band {
  margin: 22px 0 0;
  border: 1px solid var(--ab-line);
  overflow: hidden;
  background: var(--surface-2);
}

.page-about .ab-band .ky-media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .ab-plate {
  margin: 22px 0 0;
  border: 1px solid var(--ab-line);
  overflow: hidden;
  background: var(--surface);
}

.page-about .ab-plate .ky-media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.58;
}

.page-about .ab-plate__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--ab-line);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--fg-dim);
  background: var(--surface);
}

/* ---------- 三类角色 ---------- */
.page-about .ab-roles {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-role {
  background: var(--surface);
  padding: 18px 18px 20px;
  min-width: 0;
}

.page-about .ab-role__name {
  margin: 0 0 10px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
}

.page-about .ab-role__no {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .ab-role__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--fg-mid);
}

.page-about .ab-note {
  max-width: 68ch;
  margin: 16px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--pitch);
  background: var(--surface-2);
  font-size: 14px;
  line-height: 1.8;
  color: var(--fg-mid);
}

/* ---------- 五项维度 ---------- */
.page-about .ab-dims {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-dim {
  --ab-accent: var(--electric);
  border: 1px solid var(--ab-line);
  background: var(--surface);
  padding: 16px 16px 18px;
  min-width: 0;
  scroll-margin-top: 92px;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.page-about #dim-refresh { --ab-accent: var(--orange); }
.page-about #dim-reach { --ab-accent: var(--pitch); }
.page-about #dim-compare { --ab-accent: var(--electric); }
.page-about #dim-ux { --ab-accent: var(--violet); }
.page-about #dim-mobile { --ab-accent: var(--score-red); }

.page-about .ab-dim:target {
  border-color: var(--ab-accent);
  box-shadow: inset 3px 0 0 var(--ab-accent);
}

.page-about .ab-dim__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
}

.page-about .ab-dim__no {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ab-accent);
}

.page-about .ab-dim__name {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--fg);
}

.page-about .ab-dim__val {
  margin-left: auto;
  font-size: 12.5px;
  color: var(--fg-dim);
  white-space: nowrap;
}

.page-about .ab-dim__bar {
  position: relative;
  height: 6px;
  margin: 12px 0 14px;
  background: var(--surface-2);
  overflow: hidden;
}

.page-about .ab-dim__bar::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to right,
    var(--ab-line) 0 1px,
    transparent 1px 12.5%
  );
}

.page-about .ab-dim__bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 100%;
  background: var(--ab-accent);
  opacity: 0.85;
}

.page-about .ab-dim__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--fg-mid);
}

.page-about .ab-dim__self {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg);
}

.page-about .ab-dim__selfkey {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 7px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink-900);
  background: var(--pitch);
  border-radius: var(--radius);
}

/* ---------- 节奏表 ---------- */
.page-about .ab-rhythm {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-rhythm__row {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 13px 2px;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-rhythm__time {
  flex: 0 0 auto;
  min-width: 92px;
  font-size: 13px;
  color: var(--electric);
  letter-spacing: 0.02em;
}

.page-about .ab-rhythm__text {
  min-width: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--fg-mid);
}

/* ---------- 纠错步骤 ---------- */
.page-about .ab-flow {
  margin: 20px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .ab-flow__item {
  border: 1px solid var(--ab-line);
  background: var(--surface);
}

.page-about .ab-flow__item[open] {
  border-color: var(--ab-line);
  box-shadow: inset 3px 0 0 var(--orange);
}

.page-about .ab-flow__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--fg);
}

.page-about .ab-flow__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-flow__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-flow__item[open] .ab-flow__sum::after {
  content: "−";
}

.page-about .ab-flow__sum:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: -3px;
}

.page-about .ab-flow__no {
  flex: none;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--pitch);
}

.page-about .ab-flow__body {
  padding: 14px 16px 16px;
  border-top: 1px solid var(--ab-line);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--fg-mid);
}

/* ---------- 运营地区 ---------- */
.page-about .ab-region {
  margin: 20px 0 0;
  padding: 6px 18px 10px;
  border: 1px solid var(--ab-line);
  background: linear-gradient(140deg, var(--surface-2), var(--surface));
}

.page-about .ab-region__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px dashed var(--ab-line);
  font-size: 14.5px;
  line-height: 1.7;
}

.page-about .ab-region__row:last-child {
  border-bottom: 0;
}

.page-about .ab-region__key {
  flex: none;
  min-width: 80px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
}

.page-about .ab-region__val {
  min-width: 0;
  color: var(--fg);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  margin-top: clamp(40px, 6vw, 64px);
  padding: 22px 20px 24px;
  border: 1px solid var(--ab-line);
  background: var(--surface-2);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .ab-next__lead {
  flex: 1 1 240px;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg);
}

/* ---------- 侧栏维度索引 ---------- */
.page-about .ab-side {
  min-width: 0;
}

.page-about .ab-side__inner {
  border: 1px solid var(--ab-line);
  background: var(--surface);
  padding: 18px 16px 16px;
}

.page-about .ab-side__label {
  margin: 0 0 14px;
  height: 78px;
  color: var(--fg-dim);
}

.page-about .ab-side__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-side__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--ab-line);
  font-size: 14.5px;
  color: var(--fg-mid);
  text-decoration: none;
  transition: color 120ms ease, padding-left 120ms ease;
}

.page-about .ab-side__link .ky-mono {
  font-size: 12px;
  color: var(--electric);
}

.page-about .ab-side__link:hover,
.page-about .ab-side__link:focus-visible {
  color: var(--orange);
  padding-left: 6px;
}

.page-about .ab-side__link:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: -3px;
}

.page-about .ab-side__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-dim);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .ab-layout {
    grid-template-columns: minmax(0, 1.9fr) minmax(230px, 0.85fr);
    gap: clamp(32px, 4.5vw, 64px);
  }

  .page-about .ab-side__inner {
    position: sticky;
    top: 92px;
  }

  .page-about .ab-plate .ky-media__img {
    aspect-ratio: 16 / 6;
  }
}

@media (max-width: 560px) {
  .page-about .ab-rhythm__row {
    flex-direction: column;
    gap: 4px;
  }

  .page-about .ab-rhythm__time {
    min-width: 0;
  }

  .page-about .ab-region {
    padding: 4px 14px 8px;
  }

  .page-about .ab-region__key {
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-side__link,
  .page-about .ab-dim {
    transition: none;
  }
}