/* ===== page-about · 站点介绍 ===== */
.page-about {
  --about-rule: 2px;
  --about-gap: 56px;
  color: var(--ink);
}

.page-about .about-crumbs {
  padding-top: 18px;
  padding-bottom: 10px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: 8px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  border-top: var(--about-rule) solid var(--ink);
  padding-top: 22px;
  padding-bottom: 44px;
}

.page-about .about-hero__coords {
  margin: 0 0 14px;
  color: var(--teal-2);
  letter-spacing: .14em;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(34px, 9vw, 56px);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 800;
  max-width: 16em;
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 34ch;
  color: #26333a;
}

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

.page-about .about-hero__aside {
  border: var(--about-rule) solid var(--ink);
  box-shadow: var(--shot);
  background: var(--paper-2);
  padding: 18px 18px 14px;
}

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

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px dashed var(--grid);
  padding-bottom: 10px;
}

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

.page-about .about-hero__k {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--teal-2);
}

.page-about .about-hero__v {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--teal);
}

.page-about .about-hero__aside-note {
  margin: 14px 0 0;
}

/* ---------- 章节抬头微调 ---------- */
.page-about .about-team__head,
.page-about .about-tl__head,
.page-about .about-src__head,
.page-about .about-cov__head,
.page-about .about-loop__head {
  border-top: var(--about-rule) solid var(--ink);
  padding-top: 20px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  padding-top: 46px;
  padding-bottom: var(--about-gap);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-team__figure {
  margin: 0;
  border: var(--about-rule) solid var(--ink);
  box-shadow: var(--shot);
  background: var(--paper-2);
}

.page-about .about-team__figure .media {
  margin: 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.02);
}

.page-about .about-team__figure .media__cap {
  border-top: 1px solid var(--grid);
  padding: 10px 14px;
  font-size: 12px;
  color: var(--teal-2);
  letter-spacing: .04em;
}

.page-about .about-team__cards {
  display: grid;
  gap: 14px;
}

.page-about .about-team__card {
  border: var(--about-rule) solid var(--ink);
  background: var(--paper);
  box-shadow: var(--shot);
}

.page-about .about-team__card--a { border-left: 8px solid var(--teal); }
.page-about .about-team__card--b { border-left: 8px solid var(--crimson); }
.page-about .about-team__card--c { border-left: 8px solid var(--help-blue); }

.page-about .about-team__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  min-height: 44px;
}

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

.page-about .about-team__summary::after {
  content: "＋";
  grid-column: 4;
  font-family: var(--mono);
  font-size: 18px;
  color: var(--teal-2);
}

.page-about .about-team__card[open] .about-team__summary::after { content: "－"; }

.page-about .about-team__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
}

.page-about .about-team__name {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-team__count {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--crimson);
  border: 1px solid var(--crimson);
  padding: 2px 7px;
}

.page-about .about-team__panel {
  padding: 4px 16px 18px;
  border-top: 1px solid var(--grid);
}

.page-about .about-team__text {
  margin: 14px 0 12px;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.page-about .about-team__list li {
  font-size: 14px;
  color: #33424a;
  padding-left: 16px;
  position: relative;
}

.page-about .about-team__list li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--teal-2);
  font-weight: 700;
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  padding-top: 46px;
  padding-bottom: var(--about-gap);
  background: var(--paper-2);
  border-top: var(--about-rule) solid var(--ink);
  border-bottom: var(--about-rule) solid var(--ink);
}

.page-about .about-tl__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 26px;
  border-left: 2px solid var(--grid);
  display: grid;
  gap: 26px;
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.page-about .about-tl__node {
  position: absolute;
  left: -33px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--crimson);
  border: 2px solid var(--paper-2);
  outline: 2px solid var(--crimson);
}

.page-about .about-tl__item--now .about-tl__node {
  background: var(--gold);
  outline-color: var(--gold);
  box-shadow: 0 0 0 5px rgba(228, 178, 60, .22);
}

.page-about .about-tl__year {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--teal);
  letter-spacing: .04em;
}

.page-about .about-tl__ver {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--teal-2);
}

.page-about .about-tl__title {
  margin: 2px 0 6px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.7;
  color: #33424a;
}

.page-about .about-tl__item--now .about-tl__body {
  border: 2px solid var(--ink);
  background: var(--paper);
  box-shadow: var(--shot);
  padding: 14px 16px;
}

.page-about .about-tl__item--now .about-tl__text { max-width: 44ch; }

/* ---------- 内容来源 ---------- */
.page-about .about-src {
  padding-top: 46px;
  padding-bottom: var(--about-gap);
}

.page-about .about-src__band {
  position: relative;
  margin-top: 28px;
  border-top: var(--about-rule) solid var(--ink);
  border-bottom: var(--about-rule) solid var(--ink);
  background: var(--teal);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-src__bandimg {
  position: absolute;
  inset: 0;
  opacity: .28;
}

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

.page-about .about-src__inner {
  position: relative;
  z-index: 1;
  padding-top: 36px;
  padding-bottom: 36px;
}

.page-about .about-src__grid {
  row-gap: 30px;
}

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

.page-about .about-src__h {
  margin: 0 0 14px;
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -.01em;
}

.page-about .about-src__p {
  margin: 0 0 12px;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.75;
  color: #E7E0D2;
}

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

.page-about .about-src__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-src__step {
  border: 1px solid rgba(245, 239, 227, .38);
  background: rgba(16, 23, 28, .32);
  padding: 14px 16px;
}

.page-about .about-src__stepno {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .about-src__stept {
  margin: 6px 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: #fff;
}

.page-about .about-src__stepp {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #D9D2C4;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-cov {
  padding-top: 46px;
  padding-bottom: var(--about-gap);
  background: var(--paper-2);
  border-top: var(--about-rule) solid var(--ink);
  border-bottom: var(--about-rule) solid var(--ink);
}

.page-about .about-cov__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 28px;
  align-items: start;
}

.page-about .about-cov__figure {
  margin: 0;
  border: var(--about-rule) solid var(--ink);
  background: var(--paper);
  box-shadow: var(--shot);
  padding: 20px 20px 10px;
}

.page-about .about-cov__donut {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-cov__arc {
  transition: stroke-width .2s ease, opacity .2s ease;
}

.page-about .about-cov__arc:hover {
  stroke-width: 34;
}

.page-about .about-cov__donut-num {
  font-family: var(--mono);
  font-size: 40px;
  font-weight: 700;
  fill: var(--ink);
}

.page-about .about-cov__donut-cap {
  font-size: 12px;
  letter-spacing: .12em;
  fill: var(--teal-2);
}

.page-about .about-cov__figure .media__cap {
  border-top: 1px solid var(--grid);
  margin-top: 14px;
  padding-top: 10px;
  font-size: 12px;
  color: var(--teal-2);
  text-align: center;
}

.page-about .about-cov__p {
  margin: 0 0 20px;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-cov__legend {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-cov__li {
  display: grid;
  grid-template-columns: 14px auto 1fr;
  align-items: baseline;
  gap: 10px;
  border-bottom: 1px dashed var(--grid);
  padding: 8px 4px;
  transition: background .18s ease, padding-left .18s ease;
}

.page-about .about-cov__li:hover {
  background: rgba(228, 178, 60, .16);
  padding-left: 10px;
}

.page-about .about-cov__dot {
  width: 14px;
  height: 14px;
  display: block;
  align-self: center;
}

.page-about .about-cov__li--1 .about-cov__dot { background: #0F4A52; }
.page-about .about-cov__li--2 .about-cov__dot { background: #256169; }
.page-about .about-cov__li--3 .about-cov__dot { background: #4E8F94; }
.page-about .about-cov__li--4 .about-cov__dot { background: #A32A28; }
.page-about .about-cov__li--5 .about-cov__dot { background: #6F8798; }
.page-about .about-cov__li--6 .about-cov__dot { background: #C6B79E; }

.page-about .about-cov__lb {
  font-weight: 800;
  font-size: 16px;
}

.page-about .about-cov__ln {
  font-size: 13px;
  color: var(--teal-2);
  justify-self: end;
  text-align: right;
}

.page-about .about-cov__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: var(--about-rule) solid var(--ink);
  background: var(--paper);
}

.page-about .about-cov__stat {
  padding: 12px 10px;
  text-align: center;
  border-right: 1px solid var(--grid);
}

.page-about .about-cov__stat:last-child { border-right: 0; }

.page-about .about-cov__sv {
  display: block;
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--teal);
  line-height: 1.1;
}

.page-about .about-cov__sk {
  display: block;
  font-size: 12px;
  color: var(--teal-2);
  margin-top: 4px;
}

/* ---------- 反馈闭环 ---------- */
.page-about .about-loop {
  padding-top: 46px;
  padding-bottom: var(--about-gap);
}

.page-about .about-loop__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 28px;
}

.page-about .about-loop__track {
  display: grid;
  gap: 14px;
  counter-reset: loop;
}

.page-about .about-loop__step {
  border: var(--about-rule) solid var(--ink);
  background: var(--paper);
  box-shadow: var(--shot);
  padding: 16px 18px;
  border-top: 6px solid var(--teal-2);
}

.page-about .about-loop__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--help-blue);
  color: #fff;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 14px;
}

.page-about .about-loop__t {
  margin: 10px 0 6px;
  font-size: 18px;
  font-weight: 800;
}

.page-about .about-loop__p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #33424a;
}

.page-about .about-loop__p a {
  color: var(--crimson);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-loop__cases {
  background: var(--ink);
  color: var(--paper);
  border: var(--about-rule) solid var(--ink);
  box-shadow: var(--shot);
  padding: 20px 18px;
}

.page-about .about-loop__cases-t {
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

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

.page-about .about-loop__cases-list li {
  border-top: 1px solid rgba(245, 239, 227, .22);
  padding-top: 12px;
}

.page-about .about-loop__cases-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-loop__cases-list p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: #DCD5C7;
}

/* ---------- 结尾横带 ---------- */
.page-about .about-end {
  padding-left: 0;
  padding-right: 0;
}

.page-about .about-end__band {
  position: relative;
  border-top: var(--about-rule) solid var(--ink);
  overflow: hidden;
  background: var(--teal);
  color: var(--paper);
}

.page-about .about-end__img {
  position: absolute;
  inset: 0;
  opacity: .34;
}

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

.page-about .about-end__inner {
  position: relative;
  z-index: 1;
  padding-top: 40px;
  padding-bottom: 48px;
}

.page-about .about-end__coords {
  margin: 0 0 14px;
  color: var(--gold);
  letter-spacing: .16em;
}

.page-about .about-end__title {
  margin: 0 0 16px;
  font-size: clamp(26px, 6vw, 40px);
  font-weight: 800;
  letter-spacing: -.02em;
  color: #fff;
  max-width: 18em;
}

.page-about .about-end__p {
  margin: 0 0 24px;
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.75;
  color: #E7E0D2;
}

.page-about .about-end__p a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 焦点可达性 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(240px, 4fr);
    gap: 36px;
    padding-bottom: 56px;
  }

  .page-about .about-hero__title { max-width: 13em; }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-src__intro { grid-column: 1 / span 5; }
  .page-about .about-src__flow { grid-column: 6 / -1; }

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

  .page-about .about-cov__grid {
    grid-template-columns: minmax(240px, 4fr) minmax(0, 7fr);
    gap: 34px;
  }

  .page-about .about-loop__grid {
    grid-template-columns: minmax(0, 7fr) minmax(240px, 4fr);
    gap: 30px;
    align-items: start;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 8fr) minmax(280px, 3fr);
    gap: 52px;
    padding-top: 30px;
    padding-bottom: 66px;
  }

  .page-about .about-hero__title {
    font-size: clamp(44px, 4.4vw, 62px);
    max-width: 12em;
  }

  .page-about .about-hero__lede { font-size: 18px; }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
  }

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

  .page-about .about-team__summary {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
    row-gap: 4px;
  }

  .page-about .about-team__summary::after {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
  }

  .page-about .about-team__count {
    grid-column: 2;
    grid-row: 2;
    justify-self: start;
  }

  .page-about .about-tl__list {
    padding-left: 34px;
    margin-top: 42px;
    gap: 34px;
  }

  .page-about .about-tl__item {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-tl__node { left: -41px; top: 7px; }

  .page-about .about-tl__year {
    font-size: 22px;
    text-align: right;
    padding-top: 1px;
  }

  .page-about .about-src__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-cov__grid {
    grid-template-columns: minmax(280px, 4fr) minmax(0, 8fr);
    gap: 48px;
  }

  .page-about .about-cov__figure { padding: 26px 26px 14px; }

  .page-about .about-loop__grid {
    grid-template-columns: minmax(0, 8fr) minmax(280px, 4fr);
    gap: 40px;
  }

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

  .page-about .about-end__inner {
    padding-top: 60px;
    padding-bottom: 70px;
  }
}

/* ---------- 低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}