.page-about {
  --about-rail: 156px;
  --about-gap: clamp(24px, 4vw, 64px);
  --about-radius: 2px;
  background:
    linear-gradient(180deg, rgba(38, 217, 232, 0.05), rgba(6, 10, 22, 0) 360px),
    var(--bg);
  padding-block: clamp(22px, 4vw, 44px) clamp(60px, 8vw, 110px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 32px);
}

.page-about .about-main {
  min-width: 0;
}

/* ---------- 左侧节点索引 ---------- */

.page-about .about-index {
  position: relative;
  order: -1;
  min-width: 0;
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__item {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 2px solid var(--line);
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color var(--t-fast), color var(--t-fast), background-color var(--t-fast);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-bottom-color: var(--cyan);
  background-color: rgba(38, 217, 232, 0.08);
  color: var(--text);
}

.page-about .about-index__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-index__year {
  color: var(--amber);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .about-index__desc {
  color: inherit;
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-index {
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index__item {
    flex: 1 1 auto;
  }

  .page-about .about-index__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 10px 12px 10px 14px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    white-space: normal;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--cyan);
  }
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(4px, 1.5vw, 12px) clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: min(280px, 44%);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  max-width: 22ch;
  font-size: clamp(28px, 5.2vw, 54px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  max-width: 38em;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.95;
  color: var(--text-soft);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background-color: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
}

.page-about .about-hero__stat {
  background-color: var(--panel);
  padding: 14px 16px 16px;
}

.page-about .about-hero__stat dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-about .about-hero__stat dd {
  margin: 8px 0 0;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
}

@media (min-width: 680px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 章节通用 ---------- */

.page-about .about-chapter {
  padding-block: clamp(30px, 4.5vw, 58px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter:last-of-type {
  border-bottom: 0;
}

.page-about .about-chapter .section__head {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-prose p {
  max-width: 38em;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.95;
  color: var(--text-soft);
}

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

/* ---------- 每天三件事 ---------- */

.page-about .about-tasks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
}

.page-about .about-task {
  position: relative;
  background-color: var(--panel);
  padding: 22px 20px 24px;
  transition: background-color var(--t-fast);
}

.page-about .about-task::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-mid);
}

.page-about .about-task:hover {
  background-color: #101A39;
}

.page-about .about-task:hover::before {
  transform: scaleX(1);
}

.page-about .about-task__idx {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--violet);
}

.page-about .about-task__title {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-task__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .about-task__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

@media (min-width: 800px) {
  .page-about .about-tasks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-bottom: clamp(24px, 3.5vw, 38px);
}

.page-about .about-team__text p {
  max-width: 38em;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.95;
  color: var(--text-soft);
}

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

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  align-self: start;
}

.page-about .about-roles__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  background-color: var(--panel);
  padding: 16px 14px;
}

.page-about .about-roles__n {
  font-size: 24px;
  line-height: 1;
}

.page-about .about-roles__k {
  font-size: 13px;
  color: var(--text-dim);
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 图片容器 ---------- */

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background-color: var(--panel);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-figure--tall img {
  object-fit: contain;
  background-color: #0A1024;
}

/* ---------- 品类条形图 ---------- */

.page-about .about-cats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
}

.page-about .about-cat {
  background-color: var(--panel);
  padding: 16px 18px 18px;
  transition: background-color var(--t-fast);
}

.page-about .about-cat:hover {
  background-color: #101A39;
}

.page-about .about-cat__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 10px;
}

.page-about .about-cat__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-cat__n {
  font-size: 20px;
  line-height: 1;
}

.page-about .about-cat__bar {
  display: block;
  height: 4px;
  background-color: var(--line);
  overflow: hidden;
}

.page-about .about-cat__fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transition: width var(--t-mid);
}

.page-about .about-cat:nth-child(1) .about-cat__fill { width: 100%; }
.page-about .about-cat:nth-child(2) .about-cat__fill { width: 83%; }
.page-about .about-cat:nth-child(3) .about-cat__fill { width: 70%; }
.page-about .about-cat:nth-child(4) .about-cat__fill { width: 56%; }
.page-about .about-cat:nth-child(5) .about-cat__fill { width: 55%; }
.page-about .about-cat:nth-child(6) .about-cat__fill { width: 51%; }

.page-about .about-cat__note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

@media (min-width: 760px) {
  .page-about .about-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1150px) {
  .page-about .about-cats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 地区 ---------- */

.page-about .about-region {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-region__text p {
  max-width: 38em;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.95;
  color: var(--text-soft);
}

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

@media (min-width: 900px) {
  .page-about .about-region {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }
}

/* ---------- 时间轴 ---------- */

.page-about .about-track {
  list-style: none;
  margin: 0 0 clamp(24px, 3.5vw, 38px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
}

.page-about .about-track__item {
  position: relative;
  background-color: var(--panel);
  padding: 20px 18px 22px;
  transition: background-color var(--t-fast);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background-color: var(--line);
  transition: background-color var(--t-fast);
}

.page-about .about-track__item:hover {
  background-color: #101A39;
}

.page-about .about-track__item:hover::before {
  background-color: var(--cyan);
}

.page-about .about-track__year {
  display: block;
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-track__phase {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

.page-about .about-track__text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-soft);
}

@media (min-width: 860px) {
  .page-about .about-track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-track__item {
    padding: 22px 16px 24px;
  }
}

/* ---------- 收尾行动区 ---------- */

.page-about .about-cta {
  margin-top: clamp(30px, 4.5vw, 56px);
  padding: clamp(24px, 3.5vw, 40px) clamp(20px, 3vw, 36px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--about-radius);
  background:
    linear-gradient(135deg, rgba(38, 217, 232, 0.08), rgba(160, 92, 255, 0.06) 60%, rgba(6, 10, 22, 0) 100%),
    var(--panel);
}

.page-about .about-cta__idx {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--violet);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.25;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-cta__text {
  max-width: 40em;
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-soft);
}

.page-about .about-cta__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(38, 217, 232, 0.4);
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--cyan);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin: 0;
}

.page-about .about-cta__minor {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .about-cta__minor:hover,
.page-about .about-cta__minor:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-task::before,
  .page-about .about-cat__fill,
  .page-about .about-index__link,
  .page-about .about-track__item,
  .page-about .about-track__item::before {
    transition: none;
  }
}