.page-about {
  display: block;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(24px, 3.5vw, 48px) clamp(28px, 4vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  font-size: clamp(30px, 7vw, 64px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-shadow: 2px 2px 0 rgba(124, 77, 255, 0.42);
}

.page-about .about-hero__text {
  max-width: 46ch;
  color: var(--muted);
}

.page-about .about-hero__meta {
  position: relative;
  padding: 18px 20px 20px;
  border: 1px solid var(--line);
  background:
    linear-gradient(155deg, rgba(124, 77, 255, 0.18), rgba(34, 211, 238, 0.06) 58%, transparent),
    var(--panel-2);
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__meta::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: linear-gradient(90deg, var(--purple), var(--cyan), transparent);
}

.page-about .about-hero__meta-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__meta-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__meta-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 9px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-hero__meta-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-hero__meta-k {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__meta-v {
  font-size: 15px;
  color: var(--ink);
  white-space: nowrap;
}

/* ---------- 正文骨架：窄栏索引 + 宽内容 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-bottom: clamp(40px, 5vw, 80px);
}

.page-about .about-toc {
  padding-block: 12px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__label {
  margin: 0 0 8px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 18px;
  min-width: max-content;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 2px 0;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--ink);
}

.page-about .about-toc__list a.is-active {
  color: var(--cyan);
}

.page-about .about-toc__num {
  font-size: 12px;
  color: var(--violet);
  letter-spacing: 0.06em;
}

.page-about .about-toc__list a.is-active .about-toc__num {
  color: var(--cyan);
}

/* ---------- 章节通用 ---------- */

.page-about .about-flow > section {
  padding-block: clamp(30px, 4vw, 54px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}

.page-about .about-flow > section:first-child {
  border-top: 0;
  padding-top: clamp(12px, 2vw, 20px);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-chapter__num {
  flex: none;
  padding: 3px 8px;
  border: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-chapter__title {
  margin: 0;
}

.page-about .about-chapter__lede {
  max-width: 52ch;
  margin: 0 0 22px;
  color: var(--muted);
}

.page-about .about-chapter__body p {
  margin: 0 0 14px;
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__tail {
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--purple);
  color: var(--muted);
}

.page-about .about-chapter__tail a {
  color: var(--violet);
  text-underline-offset: 3px;
}

.page-about .about-chapter__tail a:hover {
  color: var(--cyan);
}

/* ---------- 起点章节：图文分栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 2.6vw, 32px);
  align-items: start;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure__frame {
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(124, 77, 255, 0.22), rgba(7, 12, 30, 0.9));
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(180deg, rgba(234, 240, 255, 0.045) 0 1px, transparent 1px 4px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-figure--wide {
  margin-top: clamp(24px, 3vw, 38px);
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--purple), var(--cyan) 62%, var(--gold));
  opacity: 0.75;
}

.page-about .about-node {
  position: relative;
  padding: 16px 0 16px 0;
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 22px;
  width: 10px;
  height: 10px;
  border: 1px solid var(--cyan);
  background: var(--bg);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.65);
  transition: background 0.25s ease, border-color 0.25s ease;
}

.page-about .about-node__ver {
  margin: 0 0 4px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--violet);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.35;
}

.page-about .about-node__body {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-node__body:last-child {
  margin-bottom: 0;
}

.page-about .about-node__extra {
  margin-top: 12px;
  overflow: hidden;
}

.page-about .about-node__extra-label {
  margin: 0 0 6px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-node__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 5px;
}

.page-about .about-node__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  color: var(--ink);
}

.page-about .about-node__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 运营班底 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-team__col {
  padding: 20px 18px 22px;
  background: var(--panel-2);
  transition: background 0.25s ease;
}

.page-about .about-team__col:hover {
  background: var(--panel);
}

.page-about .about-team__num {
  display: block;
  margin: 0 0 6px;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1;
  color: var(--violet);
}

.page-about .about-team__role {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-figure--team {
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 移动端优先：数据短条 ---------- */

.page-about .about-note-strip {
  margin-top: clamp(20px, 3vw, 30px);
  padding: 16px 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--cyan);
  background:
    linear-gradient(100deg, rgba(34, 211, 238, 0.12), transparent 70%),
    var(--panel-2);
}

.page-about .about-note-strip__k {
  font-size: clamp(20px, 3vw, 26px);
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .about-note-strip__v {
  flex: 1 1 220px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 反馈路径 ---------- */

.page-about .about-route {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-route__step {
  position: relative;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.page-about .about-route__step:hover {
  transform: translate(6px, 0);
  border-color: var(--purple);
  box-shadow: var(--shadow-neon);
}

.page-about .about-route__idx {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-route__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-route__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 数字速览条 ---------- */

.page-about .about-numbers {
  padding-block: clamp(30px, 4vw, 54px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(124, 77, 255, 0.16), rgba(34, 211, 238, 0.08) 60%, transparent),
    var(--bg);
}

.page-about .about-numbers__eyebrow {
  margin: 0 0 8px;
}

.page-about .about-numbers__title {
  margin: 0 0 22px;
}

.page-about .about-numbers__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.page-about .about-numbers__item {
  position: relative;
  padding-left: 14px;
}

.page-about .about-numbers__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--gold);
  opacity: 0.75;
}

.page-about .about-numbers__num {
  display: block;
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-numbers__label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 悬停展开（仅指针设备） ---------- */

@media (hover: hover) and (min-width: 960px) {
  .page-about .about-node__extra {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    transition: max-height 0.36s ease, opacity 0.28s ease, margin-top 0.3s ease;
  }

  .page-about .about-node:hover .about-node__extra,
  .page-about .about-node:focus-within .about-node__extra {
    max-height: 320px;
    margin-top: 12px;
    opacity: 1;
  }

  .page-about .about-node:hover::before,
  .page-about .about-node:focus-within::before {
    background: var(--cyan);
    border-color: var(--gold);
  }
}

/* ---------- 桌面布局 ---------- */

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7.5fr) minmax(0, 4.5fr);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

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

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 192px minmax(0, 1fr);
    gap: clamp(34px, 4vw, 68px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    align-self: start;
    padding: 4px 0 4px 14px;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    overflow-x: visible;
  }

  .page-about .about-toc__list {
    display: grid;
    gap: 0;
    min-width: 0;
  }

  .page-about .about-toc__list a {
    position: relative;
    padding: 8px 0;
    white-space: normal;
    transition: color 0.2s ease, transform 0.2s ease;
  }

  .page-about .about-toc__list a::before {
    content: "";
    position: absolute;
    left: -15px;
    top: 50%;
    width: 8px;
    height: 1px;
    background: var(--line);
    transition: width 0.2s ease, background 0.2s ease;
  }

  .page-about .about-toc__list a.is-active {
    transform: translateX(2px);
  }

  .page-about .about-toc__list a.is-active::before {
    width: 14px;
    background: var(--cyan);
  }
}

@media (min-width: 1000px) {
  .page-about .about-numbers__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-numbers__list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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