.page-about {
  --about-line: 2px solid var(--steel);
  --about-radius: 2px;
  display: block;
  background: var(--ink);
  color: var(--white);
  overflow-x: hidden;
}

.page-about .page-about__crumbs {
  padding-top: 24px;
}

/* ============ 首屏 ============ */

.page-about .about-hero {
  position: relative;
  border-bottom: var(--about-line);
  background:
    repeating-linear-gradient(90deg, rgba(34, 49, 79, 0.35) 0 1px, transparent 1px 72px),
    linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 100%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 56px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  color: var(--mint);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 660px;
  text-shadow: 4px 4px 0 rgba(47, 243, 208, 0.12);
}

.page-about .about-hero__lead {
  margin: 0 0 32px;
  max-width: 620px;
  color: var(--mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .about-fact {
  border: var(--about-line);
  border-radius: var(--about-radius);
  background: var(--ink-3);
  padding: 12px 10px;
}

.page-about .about-fact dt {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 14px;
  color: var(--white);
}

.page-about .about-hero__num {
  font-size: clamp(28px, 6vw, 44px);
  color: var(--score);
  display: inline-block;
  margin-right: 0.1em;
}

.page-about .about-hero__index {
  border-top: var(--about-line);
  padding-top: 20px;
}

.page-about .about-hero__index-label {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-transform: uppercase;
}

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

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 8px;
  border-left: 2px solid var(--steel);
  color: var(--white);
  text-decoration: none;
  font-size: 15px;
  transition: border-color var(--t) linear, background-color var(--t) linear, transform var(--t) linear;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  border-left-color: var(--mint);
  background: var(--ink-2);
  transform: translateX(2px);
}

.page-about .about-index__num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--mint);
}

/* ============ 通用章节骨架 ============ */

.page-about .about-section {
  border-bottom: var(--about-line);
}

.page-about .about-section__inner {
  display: grid;
  gap: 24px;
  padding-top: 48px;
  padding-bottom: 56px;
}

.page-about .about-section__head {
  align-self: start;
}

.page-about .about-section__head .index-num {
  display: block;
  margin-bottom: 10px;
  color: var(--mint);
}

.page-about .about-section__head .h2 {
  margin: 0 0 10px;
}

.page-about .about-section__claim {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.7;
  max-width: 34ch;
}

.page-about .about-section__body > * + * {
  margin-top: 24px;
}

.page-about .about-section__body .body-text {
  max-width: 62ch;
}

/* ============ 01 三条服务线 ============ */

.page-about .about-tracks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-track {
  border: var(--about-line);
  border-radius: var(--about-radius);
  background: var(--ink-2);
  padding: 20px 18px 22px;
  box-shadow: 4px 4px 0 0 var(--steel);
  transition: box-shadow var(--t) linear, border-color var(--t) linear, transform var(--t) linear;
}

.page-about .about-track:nth-child(2) {
  box-shadow: 4px 4px 0 0 var(--mint);
}

.page-about .about-track:nth-child(3) {
  box-shadow: -4px 4px 0 0 var(--orange);
}

.page-about .about-track:hover {
  border-color: var(--mint);
  transform: translateY(-2px);
}

.page-about .about-track__num {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--orange);
}

.page-about .about-track .h3 {
  margin: 0 0 8px;
}

.page-about .about-track .body-text {
  margin: 0;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-figure {
  margin: 0;
  border: var(--about-line);
  border-radius: var(--about-radius);
  background: var(--ink-3);
  padding: 10px;
}

.page-about .about-figure .media__caption {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* ============ 02 数据来源 ============ */

.page-about .about-flow {
  border: var(--about-line);
  border-radius: var(--about-radius);
  background: var(--ink-2);
  padding: 20px 18px;
  display: grid;
  gap: 20px;
}

.page-about .about-flow__sources {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  align-items: center;
}

.page-about .about-flow__node {
  font-family: var(--mono);
  font-size: 11px;
  text-align: center;
  padding: 8px 4px;
  border: 2px solid var(--steel);
  border-radius: var(--about-radius);
  color: var(--mist);
  background: var(--ink-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-flow__arrows {
  grid-column: 1 / -1;
  width: 100%;
  height: 72px;
  display: block;
}

.page-about .about-flow__arrows path {
  fill: none;
  stroke: var(--steel);
  stroke-width: 2;
  stroke-dasharray: 5 4;
}

.page-about .about-flow__arrows circle {
  fill: var(--mint);
}

.page-about .about-flow__steps {
  display: grid;
  gap: 12px;
  border-top: 2px dashed var(--steel);
  padding-top: 16px;
}

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

.page-about .about-flow__k {
  display: inline-block;
  min-width: 3.4em;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mint);
  margin-right: 8px;
}

.page-about .about-note {
  margin: 0;
  border-left: 4px solid var(--orange);
  background: var(--ink-2);
  padding: 14px 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 62ch;
}

/* ============ 03 字段与模板 ============ */

.page-about .about-fields {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-field {
  display: grid;
  gap: 6px;
  border: var(--about-line);
  border-left-width: 6px;
  border-left-color: var(--mint);
  border-radius: var(--about-radius);
  background: var(--ink-2);
  padding: 16px 18px;
}

.page-about .about-field__num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--orange);
}

.page-about .about-field .h3 {
  margin: 0;
}

.page-about .about-field .body-text {
  margin: 0;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-templates {
  border: var(--about-line);
  border-radius: var(--about-radius);
  background: var(--ink-3);
  padding: 18px;
}

.page-about .about-templates__label {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-transform: uppercase;
}

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

.page-about .about-template-list li {
  display: grid;
  gap: 2px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--steel);
}

.page-about .about-template-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-template-list strong {
  font-size: 16px;
  color: var(--white);
}

.page-about .about-template-list span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ============ 04 团队分工 ============ */

.page-about .about-teams {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-team {
  border: var(--about-line);
  border-radius: var(--about-radius);
  background: var(--ink-2);
  padding: 20px 18px 22px;
  transition: border-color var(--t) linear, box-shadow var(--t) linear, transform var(--t) linear;
}

.page-about .about-team--a {
  box-shadow: 6px 6px 0 0 var(--steel);
}

.page-about .about-team--b {
  box-shadow: -6px -6px 0 0 var(--steel);
}

.page-about .about-team--c {
  box-shadow: 6px -6px 0 0 var(--steel);
}

.page-about .about-team:hover {
  border-color: var(--mint);
  box-shadow: -4px -4px 0 0 var(--mint);
  transform: translate(2px, 2px);
}

.page-about .about-team__num {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--mint);
}

.page-about .about-team .h3 {
  margin: 0 0 8px;
}

.page-about .about-team .body-text {
  margin: 0;
  font-size: 15px;
  color: var(--mist);
}

/* ============ 05 时间线 ============ */

.page-about .about-timeline {
  display: grid;
  gap: 20px;
}

.page-about .about-years {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-years__link {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 8px 14px;
  border: var(--about-line);
  border-radius: var(--about-radius);
  color: var(--white);
  text-decoration: none;
  background: var(--ink-3);
  transition: border-color var(--t) linear, color var(--t) linear, background-color var(--t) linear;
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  border-color: var(--mint);
  color: var(--mint);
  background: var(--ink-2);
}

.page-about .about-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-node {
  position: relative;
  border: var(--about-line);
  border-radius: var(--about-radius);
  background: var(--ink-2);
  padding: 18px 18px 20px 22px;
  scroll-margin-top: 24px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -11px;
  top: 24px;
  width: 12px;
  height: 12px;
  background: var(--mint);
}

.page-about .about-node:last-child::before {
  background: var(--orange);
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-node__year {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--score);
}

.page-about .about-node .h3 {
  margin: 0 0 8px;
}

.page-about .about-node .body-text {
  margin: 0;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-figure--tall .media__caption {
  color: var(--mist);
}

/* ============ 06 覆盖与服务 ============ */

.page-about .about-stat {
  position: relative;
  border-bottom: 1px dashed var(--mint);
  cursor: help;
  white-space: nowrap;
}

.page-about .about-stat__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translateX(-50%);
  width: max-content;
  max-width: 180px;
  padding: 6px 10px;
  background: var(--ink-3);
  border: 2px solid var(--mint);
  border-radius: var(--about-radius);
  color: var(--white);
  font-size: 12px;
  line-height: 1.5;
  font-family: var(--sans);
  white-space: normal;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t) linear;
  z-index: 4;
}

.page-about .about-stat:hover .about-stat__tip,
.page-about .about-stat:focus-within .about-stat__tip {
  opacity: 1;
}

.page-about .about-reach {
  display: grid;
  gap: 18px;
}

.page-about .about-dotmap {
  height: 148px;
  border: var(--about-line);
  border-radius: var(--about-radius);
  background-color: var(--ink-3);
  background-image:
    radial-gradient(circle at 16% 26%, var(--mint) 5px, transparent 5.5px),
    radial-gradient(circle at 44% 18%, var(--mint) 5px, transparent 5.5px),
    radial-gradient(circle at 68% 42%, var(--orange) 5px, transparent 5.5px),
    radial-gradient(circle at 32% 70%, var(--mint) 5px, transparent 5.5px),
    radial-gradient(circle, var(--steel) 3px, transparent 3.5px);
  background-repeat: no-repeat, no-repeat, no-repeat, no-repeat, repeat;
  background-size: auto, auto, auto, auto, 24px 24px;
  background-position: 16px 16px, 16px 16px, 16px 16px, 16px 16px, 16px 16px;
}

.page-about .about-reach__panel {
  border: var(--about-line);
  border-radius: var(--about-radius);
  background: var(--ink-2);
  padding: 18px;
  display: grid;
  gap: 6px;
}

.page-about .about-reach__k {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-reach__k:first-child {
  margin-top: 0;
}

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

/* ============ 下一步 ============ */

.page-about .about-next {
  background: var(--ink-2);
}

.page-about .about-next__inner {
  padding-top: 48px;
  padding-bottom: 64px;
}

.page-about .about-next .h2 {
  margin: 0 0 12px;
}

.page-about .about-next__lead {
  margin: 0 0 28px;
  color: var(--mist);
  max-width: 56ch;
}

.page-about .about-next__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-next__item {
  border: var(--about-line);
  border-radius: var(--about-radius);
  background: var(--ink);
  padding: 18px;
  transition: border-color var(--t) linear, transform var(--t) linear;
}

.page-about .about-next__item:hover {
  border-color: var(--mint);
  transform: translateY(-2px);
}

.page-about .about-next__item .index-num {
  display: block;
  margin-bottom: 8px;
  color: var(--orange);
}

.page-about .about-next__item .h3 {
  margin: 0 0 8px;
}

.page-about .about-next__item .body-text {
  margin: 0;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-next__foot {
  margin: 28px 0 0;
}

/* ============ 断点 ============ */

@media (min-width: 700px) {
  .page-about .about-hero__inner {
    padding-top: 56px;
    padding-bottom: 72px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 148px));
    gap: 16px;
  }

  .page-about .about-tracks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-track:nth-child(2) {
    margin-top: 20px;
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: center;
    padding: 24px;
  }

  .page-about .about-flow__arrows {
    height: 120px;
  }

  .page-about .about-flow__steps {
    border-top: 0;
    border-left: 2px dashed var(--steel);
    padding-top: 0;
    padding-left: 20px;
  }

  .page-about .about-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-template-list li {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 12px;
  }

  .page-about .about-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-team--c {
    grid-column: 1 / -1;
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) 288px;
    column-gap: 56px;
    align-items: start;
  }

  .page-about .about-hero__index {
    border-top: var(--about-line);
    padding-top: 20px;
  }

  .page-about .about-section__inner {
    grid-template-columns: 240px minmax(0, 1fr);
    column-gap: 56px;
    row-gap: 0;
    padding-top: 64px;
    padding-bottom: 72px;
  }

  .page-about .about-section__head {
    padding-right: 8px;
  }

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

  .page-about .about-timeline {
    grid-template-columns: 112px minmax(0, 1fr);
    column-gap: 40px;
    row-gap: 24px;
  }

  .page-about .about-years {
    flex-direction: column;
    align-items: stretch;
    overflow: visible;
    align-self: start;
  }

  .page-about .about-years__link {
    text-align: center;
  }

  .page-about .about-nodes {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .about-figure--tall {
    grid-column: 1 / -1;
  }

  .page-about .about-reach {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 24px;
    align-items: stretch;
  }

  .page-about .about-dotmap {
    height: 100%;
    min-height: 220px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0ms !important;
  }
}