.page-about {
  --about-case-line: rgba(244, 168, 60, 0.35);
  overflow-x: clip;
  padding-top: clamp(96px, 12vh, 148px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .crumbs {
  margin-bottom: clamp(24px, 4vw, 48px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(40px, 6vw, 84px);
  border-bottom: 1px solid var(--line-700);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(40px, 6.2vw, 78px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ice-050);
}

.page-about .about-hero__text {
  max-width: 60ch;
  margin: 22px 0 0;
  font-size: clamp(16px, 1.6vw, 17.5px);
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__aside {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
  border-radius: var(--r-l);
  overflow: hidden;
}

.page-about .about-stat {
  padding: 22px 18px 20px;
  background: var(--surface-900);
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(32px, 3.6vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}

.page-about .about-stat:last-child .about-stat__value {
  color: var(--amber-400);
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 36px);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist-400);
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  padding-block: clamp(48px, 7vw, 96px);
  border-bottom: 1px solid var(--line-700);
}

.page-about .section__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .section__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(42px, 6vw, 70px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}

.page-about .section__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber-400);
}

.page-about .section__title {
  margin: 8px 0 0;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.24;
  color: var(--ice-050);
}

.page-about .section__lead {
  max-width: 68ch;
  margin: 16px 0 0;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--text-body);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-700);
  border-radius: var(--r-l);
}

.page-about .about-figure__cap {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--mist-400);
}

.page-about .about-figure--wide {
  max-width: 860px;
  margin: clamp(36px, 5vw, 64px) 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-700);
}

.page-about .about-step {
  position: relative;
  border-bottom: 1px solid var(--line-700);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line-700);
}

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

.page-about .about-step__trigger {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 22px;
  grid-template-areas:
    "version hint"
    "title hint";
  align-items: center;
  gap: 6px 12px;
  width: 100%;
  padding: 18px 2px;
  background: none;
  border: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.25s var(--ease);
}

.page-about .about-step__trigger:hover {
  background: rgba(53, 227, 196, 0.04);
}

.page-about .about-step__version {
  grid-area: version;
  position: relative;
  padding-left: 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--cyan-400);
}

.page-about .about-step__version::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--abyss-900);
  box-shadow: inset 0 0 0 2px var(--cyan-400);
}

.page-about .about-step--current .about-step__version {
  color: var(--amber-400);
}

.page-about .about-step--current .about-step__version::before {
  box-shadow: inset 0 0 0 2px var(--amber-400);
  background: var(--amber-400);
}

.page-about .about-step__title {
  grid-area: title;
  font-size: clamp(16px, 1.9vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ice-050);
}

.page-about .about-step__hint {
  grid-area: hint;
  position: relative;
  justify-self: end;
  width: 18px;
  height: 18px;
  flex: none;
}

.page-about .about-step__hint::before,
.page-about .about-step__hint::after {
  content: "";
  position: absolute;
  background: var(--cyan-400);
  transition: transform 0.25s var(--ease);
}

.page-about .about-step__hint::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-about .about-step__hint::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
}

.page-about [data-accordion-trigger][aria-expanded="true"] .about-step__hint::after {
  transform: scaleY(0);
}

.page-about .about-step__panel {
  padding: 0 2px 22px 20px;
  max-width: 74ch;
}

.page-about .about-step__panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-body);
}

/* ---------- 运营团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
}

.page-about .about-roles {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-700);
}

.page-about .about-role {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-700);
}

.page-about .about-role__count {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--amber-400);
}

.page-about .about-role__name {
  font-size: 18px;
  font-weight: 700;
  color: var(--ice-050);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-rhythm {
  margin-top: clamp(28px, 4vw, 40px);
  border: 1px solid var(--line-700);
  border-radius: var(--r-m);
  overflow: hidden;
  background: var(--surface-900);
}

.page-about .about-rhythm__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line-700);
}

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

.page-about .about-rhythm__key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
}

.page-about .about-rhythm__desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
}

/* ---------- 回访案例 ---------- */
.page-about .about-cases-wrap {
  padding-block: clamp(48px, 7vw, 96px);
  border-bottom: 1px solid var(--line-700);
  background:
    radial-gradient(760px 460px at 84% 0%, rgba(62, 27, 44, 0.7), rgba(62, 27, 44, 0) 68%),
    radial-gradient(560px 400px at 4% 96%, rgba(23, 30, 74, 0.55), rgba(23, 30, 74, 0) 70%);
}

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

.page-about .about-case {
  background: var(--surface-900);
  border: 1px solid var(--line-700);
  border-radius: var(--r-l);
  overflow: hidden;
}

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

.page-about .about-case__trigger {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 18px 18px;
  background: none;
  border: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.25s var(--ease);
}

.page-about .about-case__trigger:hover {
  background: rgba(244, 168, 60, 0.05);
}

.page-about .about-case__idx {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(244, 168, 60, 0.12);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--amber-400);
}

.page-about .about-case__name {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ice-050);
}

.page-about .about-case__panel {
  padding: 0 18px 22px;
}

.page-about .about-case__say {
  margin: 0 0 16px;
  padding-left: 14px;
  border-left: 2px solid var(--about-case-line);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist-400);
}

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

.page-about .about-case__steps li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-body);
}

.page-about .about-case__steps li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan-400);
}

/* ---------- 年度校订 ---------- */
.page-about .about-revisions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-revisions__text p {
  margin: 0 0 1.1em;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-revisions__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-revisions__cards {
  display: grid;
  gap: 16px;
}

.page-about .about-revision-card {
  padding: 22px 20px;
  border: 1px solid var(--line-700);
  border-left: 3px solid var(--cyan-400);
  border-radius: var(--r-m);
  background: linear-gradient(180deg, rgba(10, 30, 43, 0.9), rgba(11, 22, 32, 0.9));
}

.page-about .about-revision-card--offset {
  border-left-color: var(--amber-400);
}

.page-about .about-revision-card__season {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ice-050);
}

.page-about .about-revision-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-facts {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-700);
}

.page-about .about-facts__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-700);
}

.page-about .about-facts__k {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--mist-400);
}

.page-about .about-facts__v {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-body);
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  padding-block: clamp(44px, 6vw, 84px);
}

.page-about .about-next__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding: clamp(26px, 4vw, 46px);
  border: 1px solid var(--line-700);
  border-radius: var(--r-l);
  background:
    radial-gradient(620px 320px at 100% 0%, rgba(53, 227, 196, 0.12), rgba(53, 227, 196, 0) 66%),
    var(--surface-900);
}

.page-about .about-next__title {
  margin: 8px 0 0;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.24;
  color: var(--ice-050);
}

.page-about .about-next__text p:last-child {
  max-width: 56ch;
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-body);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-rhythm__row {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
    padding: 18px 22px;
  }

  .page-about .about-facts__row {
    grid-template-columns: 148px minmax(0, 1fr);
    align-items: baseline;
    gap: 28px;
    padding: 20px 0;
  }

  .page-about .about-step__trigger {
    grid-template-columns: 128px minmax(0, 1fr) 22px;
    grid-template-areas: "version title hint";
    gap: 20px;
    padding: 20px 4px;
  }

  .page-about .about-step__panel {
    padding: 0 4px 26px 148px;
  }

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

  .page-about .about-revision-card--offset {
    margin-top: 34px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    align-items: start;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-revisions {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    gap: 40px;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-about .section__head {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .about-cases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 26px;
    align-items: start;
  }

  .page-about .about-cases > .about-case:nth-child(even) {
    margin-top: 44px;
  }
}