.page-about {
  --ab-glow: rgba(47, 224, 203, 0.14);
  --ab-ghost: rgba(124, 123, 168, 0.5);
  background: var(--ink);
  color: var(--text);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4.4vw, 56px) 0 clamp(34px, 5vw, 72px);
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(140% 100% at 100% 0%, rgba(47, 224, 203, 0.12) 0%, rgba(47, 224, 203, 0) 56%),
    radial-gradient(90% 80% at 0% 100%, rgba(124, 123, 168, 0.16) 0%, rgba(124, 123, 168, 0) 62%),
    var(--ink);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(243, 248, 255, 0.026) 0 1px, transparent 1px 5px);
}

.page-about .ab-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .ab-hero__title {
  margin: 10px 0 18px;
  font-size: clamp(30px, 5.4vw, 60px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--white);
  max-width: 20ch;
}

.page-about .ab-hero__lede {
  margin: 0 0 16px;
  max-width: 50ch;
  color: var(--mist);
  font-size: clamp(16px, 1.8vw, 18px);
  line-height: 1.88;
}

.page-about .ab-hero__body {
  margin: 0 0 24px;
  max-width: 40ch;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__side {
  align-self: start;
  padding: 18px 18px 20px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
}

.page-about .ab-side__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mauve);
}

.page-about .ab-jump {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-jump__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  color: var(--text);
  font-size: 14.5px;
  text-decoration: none;
  transition: background var(--fast) var(--ease), border-color var(--fast) var(--ease), color var(--fast) var(--ease);
}

.page-about .ab-jump__link:hover,
.page-about .ab-jump__link:focus-visible {
  background: rgba(47, 224, 203, 0.08);
  border-left-color: var(--cyan);
  color: var(--white);
}

/* ---------- 读数条 ---------- */
.page-about .ab-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--hair);
  border: 2px solid var(--line);
}

.page-about .ab-stats__item {
  display: grid;
  gap: 6px;
  padding: 14px 16px 16px;
  background: var(--panel);
}

.page-about .ab-stats__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mauve);
}

.page-about .ab-stats__val {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 23px);
  letter-spacing: 0.02em;
  color: var(--white);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-section {
  padding: clamp(46px, 6.4vw, 96px) 0;
  border-bottom: 2px solid var(--hair);
}

.page-about .ab-section--panel {
  background: var(--panel);
  border-bottom-color: var(--line);
}

.page-about .ab-head {
  max-width: 880px;
}

.page-about .ab-head__title {
  margin: 10px 0 16px;
  font-size: clamp(24px, 3.5vw, 40px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-about .ab-head__lede {
  margin: 0;
  max-width: 52ch;
  color: var(--mist);
  line-height: 1.85;
}

/* ---------- 需求四格 ---------- */
.page-about .ab-needs {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  margin-top: clamp(24px, 3.4vw, 42px);
}

.page-about .ab-need {
  padding: 20px 20px 22px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--fast) var(--ease), box-shadow var(--fast) var(--ease), transform var(--fast) var(--ease);
}

.page-about .ab-need:hover {
  border-color: rgba(47, 224, 203, 0.6);
  box-shadow: var(--shadow-cyan);
  transform: translate(-2px, -2px);
}

.page-about .ab-need__code {
  display: block;
  margin-bottom: 10px;
}

.page-about .ab-need__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .ab-need .body-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 图像容器 ---------- */
.page-about .ab-figure {
  position: relative;
  margin: clamp(24px, 3.6vw, 42px) 0 0;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-figure .media-frame__cap {
  position: static;
  margin: 0;
  padding: 10px 16px;
  border-top: 2px solid var(--line);
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .ab-figure--side,
.page-about .ab-figure--panel {
  margin-top: 0;
}

/* ---------- 版本时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
}

.page-about .ab-tl {
  position: relative;
  margin-left: 14px;
  padding: 2px 0 30px 22px;
  border-left: 2px solid var(--line);
  transition: border-color var(--fast) var(--ease);
}

.page-about .ab-tl:last-child {
  padding-bottom: 4px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--mauve);
  transition: background var(--fast) var(--ease), box-shadow var(--fast) var(--ease);
}

.page-about .ab-tl:nth-child(2)::before {
  background: var(--mist);
}

.page-about .ab-tl:nth-child(3)::before {
  background: var(--cyan);
}

.page-about .ab-tl:nth-child(4)::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 224, 203, 0.22);
}

.page-about .ab-tl:hover {
  border-left-color: var(--cyan);
}

.page-about .ab-tl:hover::before {
  box-shadow: 0 0 0 4px rgba(47, 224, 203, 0.3);
}

.page-about .ab-tl__side {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}

.page-about .ab-tl__code {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: 0.06em;
  color: var(--mauve);
  transition: color var(--fast) var(--ease);
}

.page-about .ab-tl:hover .ab-tl__code {
  color: var(--cyan);
}

.page-about .ab-tl__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ab-ghost);
}

.page-about .ab-tl__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.1vw, 21px);
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .ab-tl__body .body-text {
  margin: 0;
  max-width: 46ch;
}

.page-about .ab-tl__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
}

/* ---------- 深色留白断层 ---------- */
.page-about .ab-void {
  position: relative;
  overflow: hidden;
  padding: clamp(52px, 8vw, 116px) 0;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(22, 35, 58, 0.92) 0%, rgba(7, 13, 27, 1) 100%);
}

.page-about .ab-void::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(157, 242, 231, 0.055) 0 1px, transparent 1px 5px);
}

.page-about .ab-void__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-void__lead {
  margin: 10px 0 16px;
  max-width: 26ch;
  font-size: clamp(22px, 3.6vw, 38px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .ab-void__num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .ab-void__sub {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mauve);
}

/* ---------- 内容来源 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .ab-split__body {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
}

.page-about .ab-flow {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--hair);
  border: 2px solid var(--line);
}

.page-about .ab-flow__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 18px;
  background: var(--panel);
  transition: background var(--fast) var(--ease);
}

.page-about .ab-flow__item:hover {
  background: var(--step);
}

.page-about .ab-flow__code {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .ab-flow__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .ab-flow__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 会员矩阵 ---------- */
.page-about .ab-member {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.6vw, 42px);
  margin-top: clamp(24px, 3.6vw, 42px);
}

.page-about .table-scroll {
  overflow-x: auto;
  border: 2px solid var(--line);
  background: var(--panel);
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-matrix {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .ab-matrix__cap {
  caption-side: top;
  padding: 14px 16px 10px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mauve);
}

.page-about .ab-matrix thead th {
  padding: 12px 14px;
  text-align: center;
  white-space: nowrap;
  border-bottom: 2px solid var(--line);
  background: var(--step);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.page-about .ab-matrix thead th:first-child {
  text-align: left;
}

.page-about .ab-matrix tbody th {
  padding: 12px 14px;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--hair);
  color: var(--text);
  font-weight: 400;
  transition: color var(--fast) var(--ease);
}

.page-about .ab-matrix tbody td {
  padding: 12px 14px;
  text-align: center;
  border-bottom: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: background var(--fast) var(--ease), color var(--fast) var(--ease);
}

.page-about .ab-matrix tbody tr:last-child th,
.page-about .ab-matrix tbody tr:last-child td {
  border-bottom: none;
}

.page-about .ab-matrix td.is-yes {
  background: rgba(47, 224, 203, 0.13);
  color: var(--mist);
}

.page-about .ab-matrix td.is-no {
  background: rgba(124, 123, 168, 0.06);
  color: var(--ab-ghost);
}

.page-about .ab-matrix tbody tr:hover th {
  color: var(--white);
}

.page-about .ab-matrix tbody tr:hover td.is-yes {
  background: rgba(47, 224, 203, 0.24);
  color: var(--white);
}

.page-about .ab-member__note {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mauve);
}

.page-about .ab-member__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 2px solid var(--hair);
}

/* ---------- 服务地区与联系 ---------- */
.page-about .ab-reach {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .ab-reach__text .body-text {
  margin: 18px 0 0;
}

.page-about .ab-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 224, 203, 0.42);
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--mist);
  border-bottom-color: var(--mist);
}

.page-about .ab-reach__btn {
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .ab-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
}

.page-about .ab-contact__row {
  display: grid;
  gap: 4px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-contact__row:last-child {
  border-bottom: none;
}

.page-about .ab-contact__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mauve);
}

.page-about .ab-contact__val {
  color: var(--white);
  font-size: 15px;
  line-height: 1.6;
  word-break: break-word;
}

.page-about .ab-contact__val.data {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-needs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .ab-tl {
    display: grid;
    grid-template-columns: 138px minmax(0, 1fr);
    column-gap: 26px;
    padding-left: 30px;
  }

  .page-about .ab-tl__side {
    position: sticky;
    top: 92px;
    align-self: start;
    margin-bottom: 0;
  }
}

@media (min-width: 940px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, 1fr);
    align-items: start;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .ab-reach {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-member {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1060px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .ab-needs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-need,
  .page-about .ab-tl,
  .page-about .ab-tl__code,
  .page-about .ab-jump__link,
  .page-about .ab-flow__item,
  .page-about .ab-matrix tbody td {
    transition: none;
  }

  .page-about .ab-need:hover {
    transform: none;
  }
}