.page-about {
  --about-gap: clamp(2.5rem, 6vw, 5rem);
  --about-ink: #07090C;
  --about-paper-text: #0B1015;
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

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

.page-about .about-crumb {
  padding-top: 1.25rem;
  padding-bottom: 0.5rem;
}

.page-about .about-crumb .breadcrumb-link,
.page-about .about-crumb .breadcrumb-current,
.page-about .about-crumb .breadcrumb-item {
  color: var(--mist);
}

.page-about .about-crumb .breadcrumb-current {
  color: var(--paper);
}

/* ---------- 刊头 ---------- */
.page-about .about-masthead {
  padding-top: clamp(1.25rem, 3vw, 2.25rem);
  padding-bottom: var(--about-gap);
  border-bottom: 1px solid var(--line);
}

.page-about .about-masthead__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-masthead__main h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6.4vw, 4.15rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0.55rem 0 1.15rem;
  max-width: 18ch;
}

.page-about .about-lead {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.15vw, 1.1rem);
  line-height: 1.85;
  color: var(--mist);
  max-width: 44ch;
  margin: 0 0 1.75rem;
}

.page-about .about-masthead__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding-top: 1.15rem;
}

.page-about .about-rail__kicker {
  font-family: var(--font-serif);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--mist);
  margin: 0 0 0.9rem;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
}

.page-about .about-rail__list li + li {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.7rem 0;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.4;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--lime);
  transform: translateX(3px);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--lime);
  letter-spacing: 0.06em;
}

.page-about .about-rail__facts {
  margin: 0;
  display: grid;
  gap: 0.85rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}

.page-about .about-rail__facts dt {
  font-size: 0.78rem;
  color: var(--mist);
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.page-about .about-rail__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .about-hero-media {
  margin: clamp(2rem, 4vw, 3rem) auto 0;
}

.page-about .about-hero-media .media-frame {
  border: 1px solid var(--line);
}

.page-about .about-hero-media img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-hero-media .media-frame__caption {
  font-family: var(--font-serif);
  font-size: 0.8rem;
  color: var(--mist);
  letter-spacing: 0.06em;
  margin-top: 0.65rem;
}

/* ---------- 为什么 ---------- */
.page-about .about-why {
  background: var(--ink-900);
}

.page-about .about-why__grid {
  row-gap: 2.5rem;
}

.page-about .about-why p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--mist);
  margin: 0 0 1.1rem;
  max-width: 50ch;
}

.page-about .about-why h2 {
  color: var(--white);
  margin-bottom: 1.25rem;
}

.page-about .about-quote {
  margin: 1.75rem 0 0;
  padding: 1.25rem 0 1.25rem 1.1rem;
  border-left: 3px solid var(--lime);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.25rem, 2.6vw, 1.75rem);
  line-height: 1.35;
  color: var(--white);
  max-width: 24ch;
}

.page-about .about-note {
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: 1.35rem 1.25rem;
}

.page-about .about-note .panel-title {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--white);
  letter-spacing: 0.04em;
  margin: 0 0 1.1rem;
}

.page-about .about-note-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-note-list li {
  display: grid;
  grid-template-columns: 1.6rem 1fr;
  gap: 0.7rem;
  align-items: start;
}

.page-about .about-note-list__idx {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--blue);
  border: 1px solid var(--line);
  padding: 0.15rem 0;
  text-align: center;
}

.page-about .about-note-list p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-why__notes .note {
  margin-top: 1rem;
  font-family: var(--font-serif);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: var(--ink-800);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec-head {
  max-width: var(--maxw-narrow);
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-sec-head .section-title {
  color: var(--white);
  margin-bottom: 1rem;
}

.page-about .about-sec-head__note {
  max-width: 56ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--mist);
  margin: 0;
}

.page-about .about-sec-head--dark .section-title {
  color: var(--about-paper-text);
}

.page-about .about-sec-head--dark .eyebrow,
.page-about .about-sec-head--dark .about-sec-head__note {
  color: #4A5460;
}

.page-about .about-timeline__media {
  margin-bottom: clamp(2rem, 4vw, 3rem);
  border: 1px solid var(--line);
}

.page-about .about-timeline__media img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .about-tl {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0 0 0 1.4rem;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 1.9rem;
}

.page-about .about-tl__item {
  position: relative;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -1.4rem;
  top: 0.6rem;
  width: 10px;
  height: 10px;
  background: var(--lime);
  transform: translateX(-50%);
}

.page-about .about-tl__item--ops::before {
  background: var(--blue);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.5vw, 2.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0 0 0.55rem;
}

.page-about .about-tl__body h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: 0.01em;
  color: var(--white);
  margin: 0.5rem 0 0.6rem;
}

.page-about .about-tl__body > p {
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist);
  margin: 0 0 0.75rem;
}

.page-about .about-tl__card {
  border-top: 1px solid var(--line);
  padding-top: 0.65rem;
}

.page-about .about-tl__card summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--blue);
}

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

.page-about .about-tl__card summary::after {
  content: "+";
  font-family: var(--font-mono);
  margin-left: auto;
  color: var(--lime);
}

.page-about .about-tl__card[open] summary::after {
  content: "–";
}

.page-about .about-tl__card summary:focus-visible {
  outline: 1px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-tl__card p {
  margin: 0.7rem 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--mist);
  border-left: 2px solid var(--line);
  padding-left: 0.8rem;
}

.page-about .about-tl__legend {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  font-family: var(--font-serif);
  font-size: 0.78rem;
  color: var(--mist);
  margin: 0;
}

.page-about .about-tl__dot {
  width: 8px;
  height: 8px;
  background: var(--lime);
  display: inline-block;
}

.page-about .about-tl__dot--blue {
  background: var(--blue);
  margin-left: 0.75rem;
}

/* ---------- 本地团队（纸感） ---------- */
.page-about .about-team {
  background: var(--paper);
  color: var(--about-paper-text);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid rgba(11, 16, 21, 0.15);
}

.page-about .about-team__grid {
  row-gap: 2rem;
  align-items: start;
}

.page-about .about-team__media .media-frame {
  border: 1px solid rgba(11, 16, 21, 0.18);
}

.page-about .about-team__media img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-team__credit {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  color: #59636F;
  margin-top: 0.7rem;
  letter-spacing: 0.04em;
}

.page-about .about-team__body .eyebrow {
  color: #59636F;
}

.page-about .about-team__body .section-title {
  color: var(--about-paper-text);
  margin-bottom: 1.15rem;
}

.page-about .about-team__body p {
  font-size: 0.99rem;
  line-height: 1.9;
  color: #333D47;
  margin: 0 0 1.05rem;
  max-width: 52ch;
}

.page-about .about-stats {
  list-style: none;
  margin: 1.5rem 0 1.6rem;
  padding: 1.25rem 0 0;
  border-top: 1px solid rgba(11, 16, 21, 0.18);
  display: grid;
  gap: 1.15rem;
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink-900);
  min-width: 3.6rem;
}

.page-about .about-stat__label {
  font-size: 0.85rem;
  color: #59636F;
  line-height: 1.5;
}

.page-about .about-team__contact {
  border-left: 3px solid var(--blue);
  padding-left: 1rem;
  display: grid;
  gap: 0.5rem;
}

.page-about .about-team__contact p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: #333D47;
  max-width: none;
}

.page-about .about-team__contact span {
  display: inline-block;
  min-width: 4.6rem;
  color: #59636F;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.page-about .about-team__contact a {
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 1px solid var(--lime);
}

.page-about .about-team__contact a:hover,
.page-about .about-team__contact a:focus-visible {
  color: #1F6B00;
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  background: var(--paper);
  padding-top: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-principles__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(11, 16, 21, 0.16);
  border: 1px solid rgba(11, 16, 21, 0.16);
}

.page-about .about-principle {
  background: var(--paper);
  padding: 1.35rem 1.2rem 1.5rem;
}

.page-about .about-principle__num {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  color: #8A9299;
  margin: 0 0 0.7rem;
}

.page-about .about-principle h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--about-paper-text);
  margin: 0 0 0.6rem;
  letter-spacing: 0.01em;
}

.page-about .about-principle p {
  font-size: 0.92rem;
  line-height: 1.8;
  color: #333D47;
  margin: 0 0 0.7rem;
}

.page-about .about-principle__scene {
  color: #59636F !important;
  font-size: 0.84rem !important;
  border-top: 1px solid rgba(11, 16, 21, 0.14);
  padding-top: 0.7rem;
  margin-bottom: 0 !important;
}

/* ---------- 合作生态 ---------- */
.page-about .about-ecosystem {
  background: var(--ink-900);
  border-top: 1px solid var(--line);
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3rem);
}

.page-about .about-eco__main .section-title {
  color: var(--white);
  margin-bottom: 1.1rem;
}

.page-about .about-eco__main > p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--mist);
  margin: 0 0 1.75rem;
  max-width: 52ch;
}

.page-about .about-eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-eco-list li {
  background: var(--ink-900);
  padding: 1.1rem 0 1.15rem;
}

.page-about .about-eco-list h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--lime);
  margin: 0 0 0.45rem;
  letter-spacing: 0.02em;
}

.page-about .about-eco-list p {
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist);
  margin: 0;
  max-width: 48ch;
}

.page-about .about-eco__side .about-update {
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: 1.35rem 1.25rem 1.4rem;
}

.page-about .about-eco__side .panel-title {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--white);
  margin: 0 0 1rem;
  letter-spacing: 0.05em;
}

.page-about .about-update__list {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-update__list li {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mist);
  border-left: 2px solid var(--line);
  padding-left: 0.8rem;
}

.page-about .about-update__list span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--blue);
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.page-about .about-eco__side .note {
  font-family: var(--font-serif);
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--mist);
  margin: 1rem 0 0;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--ink-800);
  border-top: 1px solid var(--line);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-next__card {
  display: block;
  background: var(--ink-800);
  padding: 1.3rem 1.15rem 1.2rem;
  text-decoration: none;
  color: var(--paper);
  transition: background 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: var(--deep-green);
  transform: translateY(-2px);
}

.page-about .about-next__idx {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.page-about .about-next__card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.12rem;
  color: var(--white);
  margin: 0.55rem 0 0.5rem;
}

.page-about .about-next__card p {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mist);
  margin: 0 0 0.9rem;
}

.page-about .about-next__go {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--lime);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-principles__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-rail__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-masthead__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-why__grid {
    align-items: start;
  }

  .page-about .about-tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1.5rem;
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 2.1rem;
  }

  .page-about .about-tl__item::before {
    left: 0;
    top: -2.1rem;
    transform: translate(-50%, -50%);
  }

  .page-about .about-tl__year {
    font-size: 1.9rem;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

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

  .page-about .about-hero-media {
    margin-top: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card,
  .page-about .about-rail__list a {
    transition: none;
  }

  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible,
  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    transform: none;
  }
}