.page-about {
  --about-rail: 224px;
  --about-lane: clamp(1.35rem, 4vw, 2.75rem);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-5);
  line-height: 1.85;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  padding: 1.25rem 0 .25rem;
  font-size: var(--fs-6);
  letter-spacing: .06em;
  color: var(--green-mid);
}

.page-about .breadcrumb a {
  color: var(--green-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--red);
  border-bottom-color: var(--red);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 110% at 92% 0%, rgba(201, 162, 39, .2) 0%, rgba(201, 162, 39, 0) 58%),
    var(--canvas);
  border-bottom: 1px solid rgba(201, 162, 39, .38);
}

.page-about .about-hero__inner {
  padding: 1.75rem 0 2.75rem;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-size: var(--fs-6);
  letter-spacing: .2em;
  color: var(--red);
}

.page-about .about-hero__title {
  margin: .7rem 0 1rem;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3.25rem);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--green-deep);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 48ch;
  font-size: var(--fs-4);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 2rem 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid rgba(201, 162, 39, .45);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  padding-right: 1.5rem;
  border-right: 1px solid rgba(201, 162, 39, .45);
}

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

.page-about .about-fact__num {
  font-size: var(--fs-3);
  line-height: 1.1;
  color: var(--red);
}

.page-about .about-fact__label {
  font-size: var(--fs-6);
  letter-spacing: .1em;
  color: var(--green-mid);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  padding-bottom: 3.5rem;
}

.page-about .about-canvas {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ---------- 左侧窄栏 ---------- */
.page-about .about-rail__title {
  margin: 0 0 .6rem;
  font-size: var(--fs-6);
  letter-spacing: .2em;
  color: var(--green-mid);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 .4rem;
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .45rem .85rem;
  border-radius: var(--radius-pill);
  background: var(--sand);
  color: var(--green-deep);
  font-size: var(--fs-6);
  letter-spacing: .06em;
  text-decoration: none;
  white-space: nowrap;
  transition: background .16s ease, color .16s ease;
}

.page-about .about-rail__link:hover {
  background: var(--red);
  color: var(--canvas);
}

.page-about .about-rail__num {
  font-size: var(--fs-6);
  color: var(--gold);
}

.page-about .about-rail__link:hover .about-rail__num {
  color: rgba(255, 253, 248, .85);
}

.page-about .about-rail__stage {
  display: none;
}

.page-about .about-rail__stamp {
  margin: 1rem 0 0;
  font-size: var(--fs-6);
  letter-spacing: .14em;
  color: var(--green-mid);
}

/* ---------- 画板 ---------- */
.page-about .about-section {
  border-radius: var(--radius-panel);
  padding: var(--about-lane);
  background: var(--canvas);
}

.page-about .about-section--sand {
  background: var(--sand);
}

.page-about .about-section--deep {
  background: var(--green-deep);
  color: rgba(246, 241, 231, .9);
}

.page-about .about-section__eyebrow {
  margin: 0 0 .5rem;
  font-size: var(--fs-6);
  letter-spacing: .18em;
  color: var(--red);
}

.page-about .about-section--deep .about-section__eyebrow {
  color: var(--gold);
}

.page-about .about-section__title {
  margin: 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.05rem);
  line-height: 1.32;
  letter-spacing: -.004em;
  color: var(--green-deep);
}

.page-about .about-section--deep .about-section__title {
  color: var(--canvas);
}

.page-about .about-section__note {
  margin: .85rem 0 0;
  font-size: var(--fs-6);
  color: var(--green-mid);
}

.page-about .about-section--deep .about-section__note {
  color: rgba(237, 228, 211, .85);
}

.page-about .about-section__lead {
  margin: 1.5rem 0 0;
  max-width: 54ch;
  color: var(--ink);
}

.page-about .about-section__foot {
  margin: 1.75rem 0 0;
  padding-top: 1.1rem;
  border-top: 1px solid rgba(201, 162, 39, .5);
  font-size: var(--fs-6);
  line-height: 1.85;
  color: var(--green-mid);
}

.page-about .about-section--deep .about-section__foot {
  border-top-color: rgba(201, 162, 39, .55);
  color: rgba(237, 228, 211, .82);
}

.page-about .about-section a {
  color: var(--green-deep);
  text-decoration: underline;
  text-decoration-color: rgba(78, 107, 96, .55);
  text-underline-offset: .25em;
  transition: color .16s ease, text-decoration-color .16s ease;
}

.page-about .about-section a:hover {
  color: var(--red);
  text-decoration-color: var(--red);
}

.page-about .about-section--deep a {
  color: var(--gold);
  text-decoration-color: rgba(201, 162, 39, .6);
}

.page-about .about-section--deep a:hover {
  color: var(--canvas);
  text-decoration-color: var(--canvas);
}

.page-about .prose p {
  margin: 0 0 1rem;
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 01 建构由来 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
}

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

.page-about .about-split__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-block);
}

.page-about .media-frame__caption {
  margin-top: .6rem;
  font-size: var(--fs-6);
  line-height: 1.7;
  color: var(--green-mid);
}

.page-about .about-naming {
  margin: 1.75rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(201, 162, 39, .5);
  display: grid;
  gap: .8rem;
}

.page-about .about-naming__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .15rem;
}

.page-about .about-naming dt {
  font-size: var(--fs-6);
  letter-spacing: .14em;
  color: var(--red);
}

.page-about .about-naming dd {
  margin: 0;
  font-size: var(--fs-6);
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 02 登记准则 ---------- */
.page-about .about-band {
  margin: 1.5rem 0 0;
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--radius-block);
}

.page-about .about-band--tall img {
  aspect-ratio: 10 / 7;
}

.page-about .about-band__caption {
  margin-top: .6rem;
  font-size: var(--fs-6);
  line-height: 1.7;
  color: var(--green-mid);
}

.page-about .about-fields {
  margin-top: 1.5rem;
  display: grid;
  gap: .6rem;
}

.page-about .about-field {
  border-left: 3px solid rgba(201, 162, 39, .55);
  border-radius: 0 var(--radius-block) var(--radius-block) 0;
  background: rgba(255, 253, 248, .72);
  transition: border-color .16s ease, background .16s ease;
}

.page-about .about-field:hover {
  border-left-color: var(--red);
  background: var(--canvas);
}

.page-about .about-field__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: .4rem .85rem;
  padding: .85rem 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-field__no {
  font-size: var(--fs-6);
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-field__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-4);
  color: var(--green-deep);
  transition: color .16s ease;
}

.page-about .about-field__summary:hover .about-field__name {
  color: var(--red);
}

.page-about .about-field__count {
  font-size: var(--fs-6);
  white-space: nowrap;
  color: var(--green-mid);
}

.page-about .about-field__chev {
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--red);
  border-bottom: 1.5px solid var(--red);
  transform: rotate(-45deg);
  transition: transform .16s ease;
}

.page-about .about-field[open] .about-field__chev {
  transform: rotate(45deg);
}

.page-about .about-field__body {
  padding: 0 1rem 1.1rem;
}

.page-about .about-field__body p {
  margin: 0 0 .7rem;
  font-size: var(--fs-6);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-field__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(10.5rem, 1fr));
  gap: .3rem 1rem;
}

.page-about .about-field__list li {
  position: relative;
  padding-left: .95rem;
  font-size: var(--fs-6);
  line-height: 1.8;
  color: var(--green-mid);
}

.page-about .about-field__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 6px;
  height: 1px;
  background: var(--red-light);
}

/* ---------- 03 四档售后 ---------- */
.page-about .about-tiers {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .about-tier {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .4rem;
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius-block);
  border-left: 3px solid var(--gold);
  background: rgba(255, 253, 248, .07);
  transition: background .16s ease, border-color .16s ease;
}

.page-about .about-tier:hover {
  background: rgba(255, 253, 248, .14);
  border-left-color: var(--red-light);
}

.page-about .about-tier__no {
  margin: 0;
  font-size: var(--fs-6);
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-tier__name {
  margin: 0 0 .3rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-4);
  color: var(--canvas);
}

.page-about .about-tier__scope {
  margin: 0;
  font-size: var(--fs-6);
  line-height: 1.85;
  color: rgba(237, 228, 211, .82);
}

.page-about .about-tier__time {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.2;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .about-tier__time span {
  margin-left: .25rem;
  font-size: var(--fs-6);
  color: rgba(237, 228, 211, .82);
}

/* ---------- 04 交付路径 ---------- */
.page-about .about-paths {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-path {
  padding: 1.35rem 1.4rem;
  border-radius: var(--radius-block);
  background: var(--paper);
  border-top: 3px solid var(--red);
}

.page-about .about-path--alt {
  background: var(--canvas);
  border-top-color: var(--blue);
}

.page-about .about-path__label {
  margin: 0;
  font-size: var(--fs-6);
  letter-spacing: .2em;
  color: var(--green-mid);
}

.page-about .about-path__name {
  margin: .35rem 0 .15rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-3);
  color: var(--green-deep);
}

.page-about .about-path__cycle {
  margin: 0 0 .8rem;
  font-size: var(--fs-4);
  color: var(--red);
}

.page-about .about-path--alt .about-path__cycle {
  color: var(--blue);
}

.page-about .about-path__desc {
  margin: 0 0 1rem;
  font-size: var(--fs-6);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-path__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .5rem;
}

.page-about .about-path__list li {
  position: relative;
  padding-left: 1rem;
  font-size: var(--fs-6);
  line-height: 1.8;
  color: var(--green-mid);
}

.page-about .about-path__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 05 沿革 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 1.6rem 1.7rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .2rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: .7rem;
  bottom: 0;
  width: 1px;
  background: rgba(168, 50, 42, .35);
}

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

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: .35rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--canvas);
  border: 2px solid var(--red);
  transition: background .16s ease, transform .16s ease;
}

.page-about .about-timeline__item:hover::after {
  background: var(--red);
  transform: scale(1.18);
}

.page-about .about-timeline__year {
  margin: 0;
  font-size: var(--fs-6);
  letter-spacing: .18em;
  color: var(--red);
}

.page-about .about-timeline__name {
  margin: .15rem 0 .35rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-4);
  color: var(--green-deep);
}

.page-about .about-timeline__content p {
  margin: 0;
  font-size: var(--fs-6);
  line-height: 1.9;
  color: var(--ink);
}

/* ---------- 06 团队与资质 ---------- */
.page-about .about-team {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
}

.page-about .about-team__cell {
  position: relative;
  padding: 1.1rem 1rem;
  border-radius: var(--radius-block);
  background: var(--sand);
  cursor: default;
  transition: background .16s ease;
}

.page-about .about-team__cell:hover,
.page-about .about-team__cell:focus-visible {
  background: var(--red);
  outline: none;
}

.page-about .about-team__num {
  margin: 0;
  font-size: var(--fs-2);
  line-height: 1;
  color: var(--red);
  transition: color .16s ease;
}

.page-about .about-team__name {
  margin: .55rem 0 0;
  font-size: var(--fs-6);
  letter-spacing: .1em;
  color: var(--green-deep);
  transition: color .16s ease;
}

.page-about .about-team__cell:hover .about-team__num,
.page-about .about-team__cell:focus-visible .about-team__num,
.page-about .about-team__cell:hover .about-team__name,
.page-about .about-team__cell:focus-visible .about-team__name {
  color: var(--canvas);
}

.page-about .about-team__desc {
  position: absolute;
  left: 0;
  top: calc(100% + .5rem);
  z-index: 4;
  width: max-content;
  max-width: 16rem;
  margin: 0;
  padding: .6rem .8rem;
  border-radius: var(--radius-block);
  background: var(--green-deep);
  color: var(--paper);
  font-size: var(--fs-6);
  line-height: 1.7;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .16s ease, visibility .16s ease;
}

.page-about .about-team__cell:hover .about-team__desc,
.page-about .about-team__cell:focus-visible .about-team__desc {
  opacity: 1;
  visibility: visible;
}

.page-about .about-team__notes {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(201, 162, 39, .5);
  font-size: var(--fs-6);
  line-height: 1.9;
}

/* ---------- 07 合作生态 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-about .about-partner {
  padding-top: .9rem;
  border-top: 2px solid var(--gold);
}

.page-about .about-partner__no {
  margin: 0;
  font-size: var(--fs-6);
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-partner__name {
  margin: .35rem 0 .45rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-4);
  color: var(--green-deep);
}

.page-about .about-partner__desc {
  margin: 0;
  font-size: var(--fs-6);
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 尾部收束 ---------- */
.page-about .about-tail {
  border-radius: var(--radius-panel);
  padding: var(--about-lane);
  background: linear-gradient(120deg, var(--sand) 0%, var(--paper) 78%);
  display: grid;
  gap: 1.25rem;
  justify-items: start;
}

.page-about .about-tail__text {
  margin: 0;
  max-width: 52ch;
  color: var(--ink);
}

.page-about .about-tail__text a {
  color: var(--green-deep);
  text-decoration: underline;
  text-decoration-color: rgba(78, 107, 96, .55);
  text-underline-offset: .25em;
  transition: color .16s ease, text-decoration-color .16s ease;
}

.page-about .about-tail__text a:hover {
  color: var(--red);
  text-decoration-color: var(--red);
}

.page-about .about-tail__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
    gap: 2rem;
  }

  .page-about .about-naming__row {
    grid-template-columns: 7rem minmax(0, 1fr);
    gap: 0 1.25rem;
    align-items: baseline;
  }

  .page-about .about-tier {
    grid-template-columns: 4.5rem minmax(0, 1fr) auto;
    align-items: start;
    gap: 1.5rem;
    padding: 1.25rem 1.5rem;
  }

  .page-about .about-tier__time {
    text-align: right;
  }

  .page-about .about-paths {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 6rem minmax(0, 1fr);
    column-gap: 1.5rem;
    padding-left: 1.9rem;
  }

  .page-about .about-timeline__year {
    text-align: right;
    padding-top: .34rem;
  }

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

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-tail {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    justify-items: start;
    gap: 1.5rem;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    padding: 2.5rem 0 3.5rem;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 2.75rem;
    align-items: start;
    padding-top: 2.75rem;
    padding-bottom: 4.5rem;
  }

  .page-about .about-rail {
    position: sticky;
    top: 1.5rem;
    padding-left: 1.1rem;
    border-left: 1px solid rgba(201, 162, 39, .45);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__item {
    position: relative;
    padding-left: 1.4rem;
  }

  .page-about .about-rail__item::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 1.6rem;
    bottom: 0;
    width: 1px;
    background: rgba(201, 162, 39, .55);
  }

  .page-about .about-rail__item:last-child::before {
    display: none;
  }

  .page-about .about-rail__item::after {
    content: "";
    position: absolute;
    left: 0;
    top: 1.2rem;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    border: 1.5px solid var(--gold);
    background: var(--canvas);
    transition: background .16s ease, border-color .16s ease;
  }

  .page-about .about-rail__item:hover::after {
    background: var(--red);
    border-color: var(--red);
  }

  .page-about .about-rail__item:hover .about-rail__link {
    color: var(--red);
  }

  .page-about .about-rail__link {
    position: relative;
    display: block;
    padding: .55rem 0;
    border-radius: 0;
    background: none;
    color: var(--green-mid);
    transition: color .16s ease;
  }

  .page-about .about-rail__link:hover {
    background: none;
    color: var(--red);
  }

  .page-about .about-rail__num {
    margin-right: .45rem;
    color: var(--gold);
  }

  .page-about .about-rail__link:hover .about-rail__num {
    color: var(--gold);
  }

  .page-about .about-rail__stage {
    display: block;
    position: absolute;
    left: calc(100% + .65rem);
    top: 50%;
    z-index: 6;
    padding: .28rem .7rem;
    border-radius: var(--radius-pill);
    background: var(--green-deep);
    color: var(--canvas);
    font-size: var(--fs-6);
    letter-spacing: .06em;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-50%) translateX(-4px);
    transition: opacity .16s ease, transform .16s ease, visibility .16s ease;
  }

  .page-about .about-rail__link:hover .about-rail__stage,
  .page-about .about-rail__link:focus-visible .about-rail__stage {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) translateX(0);
  }

  .page-about .about-canvas {
    gap: 2rem;
  }
}