.page-about {
  --about-trail-pad: clamp(20px, 4vw, 34px);
  --about-cut: 24px;
}

.page-about .section {
  padding-block: clamp(46px, 6vw, 86px);
}

.page-about .section--ink {
  color: var(--paper);
}

.page-about .section--ink .eyebrow {
  color: var(--orange-soft);
}

.page-about .section--ink .h2,
.page-about .section--ink .h3,
.page-about .section--ink .lead {
  color: inherit;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  color: var(--paper);
  padding-block: clamp(24px, 4vw, 42px) clamp(46px, 6vw, 82px);
  background-image: radial-gradient(circle at 84% 6%, rgba(255, 107, 44, 0.18), transparent 58%);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(22px, 3.4vw, 34px);
  font-size: 14px;
}

.page-about .about-hero .breadcrumbs__item {
  color: var(--steel);
  text-decoration: none;
}

.page-about .about-hero a.breadcrumbs__item:hover {
  color: var(--orange-soft);
}

.page-about .about-hero .breadcrumbs__sep {
  color: var(--steel);
  opacity: 0.6;
  padding-inline: 6px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero .h1 {
  color: var(--paper);
  margin: 12px 0 18px;
}

.page-about .about-hero .lead {
  color: rgba(247, 242, 232, 0.84);
  max-width: 56ch;
  margin: 0 0 26px;
}

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

.page-about .about-facts {
  position: relative;
  background: rgba(27, 36, 80, 0.88);
  border: 1px solid var(--line-darker);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-facts::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: var(--about-cut);
  height: var(--about-cut);
  background: var(--surface, var(--ink-950));
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  pointer-events: none;
}

.page-about .about-facts .panel__label {
  color: var(--orange-soft);
  margin-bottom: 14px;
}

.page-about .about-facts .panel__foot {
  color: var(--steel);
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.6;
}

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

.page-about .facts-list__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .facts-list__item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .facts-list__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  min-width: 5.2em;
  letter-spacing: -0.02em;
}

.page-about .facts-list__unit {
  font-size: 0.58em;
  margin-left: 2px;
}

.page-about .facts-list__text {
  font-size: 15px;
  line-height: 1.65;
  color: rgba(247, 242, 232, 0.86);
}

/* ---------- 发展历程 ---------- */
.page-about .about-years {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: clamp(26px, 4vw, 42px);
  scrollbar-width: thin;
}

.page-about .about-years__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line-light);
  color: var(--ink-950);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.page-about .about-years__num {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-years__item:hover,
.page-about .about-years__item:focus-visible {
  border-color: var(--orange);
  background: var(--ink-950);
  color: var(--paper);
}

.page-about .about-trail__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 46px);
}

.page-about .trail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--about-trail-pad);
  border-left: 2px solid var(--line-light);
}

.page-about .trail-item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 42px);
  scroll-margin-top: 100px;
}

.page-about .trail-item:last-child {
  padding-bottom: 0;
}

.page-about .trail-item::before {
  content: "";
  position: absolute;
  top: 7px;
  left: calc(-1 * var(--about-trail-pad) - 7px);
  width: 12px;
  height: 12px;
  background: var(--orange);
  transform: rotate(45deg);
  transition: background-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .trail-item:target::before {
  background: var(--celadon);
  box-shadow: 0 0 0 5px rgba(79, 184, 166, 0.22);
}

.page-about .trail-item__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .trail-item .h3 {
  margin: 0 0 8px;
  color: var(--ink-950);
}

.page-about .trail-item p:not(.trail-item__year) {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-700);
  max-width: 62ch;
}

.page-about .trail-side {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-trail__figure,
.page-about .about-team__figure,
.page-about .about-net__figure {
  margin: 0;
}

.page-about .about-trail__figure img,
.page-about .about-team__figure img,
.page-about .about-net__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .trail-side__card {
  border: 1px solid var(--line-light);
  border-left: 4px solid var(--orange);
  background: var(--paper);
  padding: 18px 20px;
}

.page-about .trail-side__card--celadon {
  border-left-color: var(--celadon);
}

.page-about .trail-side__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink-950);
}

.page-about .trail-side__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-700);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team__figure {
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: var(--gap);
}

.page-about .team-card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line-light);
  padding: clamp(18px, 2.6vw, 24px);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.page-about .team-card:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
  box-shadow: 6px 8px 0 rgba(11, 18, 48, 0.08);
}

.page-about .team-card__title {
  margin: 12px 0 6px;
  font-size: 20px;
  line-height: 1.35;
  color: var(--ink-950);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-700);
}

.page-about .team-card__more {
  margin-top: 14px;
  transition: max-height 0.28s ease, margin-top 0.28s ease;
}

.page-about .team-card__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .team-card__issues {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--celadon-deep);
}

.page-about .team-card__issues li {
  position: relative;
  padding-left: 14px;
}

.page-about .team-card__issues li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--celadon);
}

/* ---------- 服务网络 ---------- */
.page-about .about-net__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-net .h2 {
  margin: 10px 0 14px;
}

.page-about .about-net .lead {
  color: rgba(247, 242, 232, 0.82);
  margin: 0;
  max-width: 52ch;
}

.page-about .zone-list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .zone {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 12px 16px;
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--celadon);
  color: var(--paper);
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.page-about .zone:hover {
  background: rgba(79, 184, 166, 0.16);
  border-left-color: var(--celadon-lift);
  transform: translateX(2px);
}

.page-about .zone__name {
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .zone__note {
  font-size: 14px;
  color: var(--steel);
}

.page-about .zone--other {
  border-left-color: var(--steel);
}

.page-about .zone--other:hover {
  background: rgba(141, 150, 170, 0.14);
  border-left-color: var(--steel);
}

.page-about .about-net__figure .media-frame__caption {
  color: var(--steel);
}

/* ---------- 四项做法 ---------- */
.page-about .ways-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-light);
}

.page-about .way {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  padding: clamp(18px, 3vw, 26px) 0;
  border-bottom: 1px solid var(--line-light);
  transition: background-color 0.18s ease;
}

.page-about .way:hover {
  background: rgba(255, 107, 44, 0.06);
}

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

.page-about .way__title {
  margin: 0 0 6px;
  font-size: 20px;
  line-height: 1.4;
  color: var(--ink-950);
}

.page-about .way__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.76;
  color: var(--ink-700);
  max-width: 66ch;
}

.page-about .way .tag {
  grid-column: 2;
  justify-self: start;
}

/* ---------- 首次到访 ---------- */
.page-about .welcome-slab {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  background: var(--paper);
  border: 1px solid var(--line-light);
  border-top: 4px solid var(--orange);
  padding: clamp(24px, 4vw, 44px);
}

.page-about .welcome-slab__head .h2 {
  margin: 10px 0 14px;
  color: var(--ink-950);
}

.page-about .welcome-slab__head p:not(.eyebrow) {
  margin: 0;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-700);
  max-width: 48ch;
}

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

.page-about .welcome-step {
  background: var(--paper-2);
  border-left: 3px solid var(--celadon);
  padding: 16px 18px;
}

.page-about .welcome-step__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--celadon-deep);
}

.page-about .welcome-step h3 {
  margin: 6px 0 6px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink-950);
}

.page-about .welcome-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-700);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: var(--gap);
}

.page-about .cadence-card {
  background: var(--paper);
  border: 1px solid var(--line-light);
  border-top: 3px solid var(--steel);
  padding: clamp(18px, 2.4vw, 24px);
}

.page-about .cadence-card--orange {
  border-top-color: var(--orange);
}

.page-about .cadence-card--celadon {
  border-top-color: var(--celadon);
}

.page-about .cadence-card__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .cadence-card__title {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.42;
  color: var(--ink-950);
}

.page-about .cadence-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-700);
}

.page-about .cadence-log {
  margin-top: clamp(24px, 4vw, 36px);
  border: 1px solid var(--line-light);
  background: var(--paper);
}

.page-about .cadence-log__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--ink-950);
  cursor: pointer;
  list-style: none;
  transition: color 0.18s ease;
}

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

.page-about .cadence-log__summary::after {
  content: "+";
  font-size: 18px;
  color: var(--orange);
}

.page-about .cadence-log[open] .cadence-log__summary::after {
  content: "−";
}

.page-about .cadence-log__summary:hover {
  color: var(--orange);
}

.page-about .cadence-log__list {
  list-style: none;
  margin: 0;
  padding: 0 20px 22px;
  display: grid;
  gap: 14px;
}

.page-about .cadence-log__list li {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .cadence-log__when {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--celadon-deep);
  border: 1px solid rgba(79, 184, 166, 0.5);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta__inner {
  max-width: 760px;
}

.page-about .about-cta .h2 {
  color: var(--paper);
  margin: 0 0 14px;
}

.page-about .about-cta__text {
  margin: 0 0 24px;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(247, 242, 232, 0.85);
}

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

.page-about .about-cta__links {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-cta__links .link-underline {
  color: var(--paper);
}

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

  .page-about .cadence-grid {
    grid-template-columns: 1.15fr 1fr 0.95fr;
  }
}

@media (min-width: 820px) {
  .page-about .way {
    grid-template-columns: 62px minmax(0, 1fr) auto;
    align-items: start;
    gap: 26px;
    padding-inline: 12px;
  }

  .page-about .way .tag {
    grid-column: auto;
    justify-self: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-trail__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-net__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .welcome-slab {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-card:nth-child(even) {
    margin-top: 28px;
  }
}

@media (min-width: 1024px) and (hover: hover) {
  .page-about .team-card__more {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
  }

  .page-about .team-card:hover .team-card__more,
  .page-about .team-card:focus-within .team-card__more {
    max-height: 200px;
    margin-top: 14px;
  }
}

@media (max-width: 420px) {
  .page-about .facts-list__num {
    min-width: 4.4em;
  }

  .page-about .zone {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }

  .page-about .team-card:hover,
  .page-about .zone:hover {
    transform: none;
  }

  .page-about .team-card__more {
    max-height: none;
  }
}