.page-about {
  --about-line: #E1E5E8;
  --about-line-soft: rgba(28, 31, 34, 0.1);
  --about-cut: 10px;
  display: block;
  background: var(--mist);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 20px 0 56px;
  background:
    radial-gradient(120% 92% at 88% 6%, rgba(31, 122, 84, 0.42) 0%, rgba(11, 61, 46, 0) 64%),
    linear-gradient(158deg, #0B3D2E 0%, #082E22 68%, #0A3628 100%);
  color: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(244, 196, 48, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244, 196, 48, 0.06) 1px, transparent 1px);
  background-size: 68px 68px;
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb__link {
  color: rgba(250, 246, 241, 0.72);
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--amber);
}

.page-about .about-hero .breadcrumb__item span[aria-current="page"] {
  color: rgba(250, 246, 241, 0.5);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  margin-top: 22px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  padding-left: 10px;
  border-left: 3px solid var(--red);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-title);
  font-size: clamp(30px, 6vw, 54px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.page-about .about-hero__lead {
  max-width: 48ch;
  margin: 0 0 28px;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: rgba(250, 246, 241, 0.86);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 0;
  padding-top: 22px;
  border-top: 1px solid rgba(250, 246, 241, 0.18);
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .hero-stat__value {
  order: 1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .hero-stat__value--red {
  color: #E4455A;
}

.page-about .hero-stat__label {
  order: 2;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: rgba(250, 246, 241, 0.68);
}

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

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 0 var(--about-cut) 0 var(--about-cut);
  filter: saturate(0.88) contrast(1.06);
}

.page-about .about-hero__badge {
  position: absolute;
  left: 14px;
  bottom: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--amber);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-hero__badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--red);
}

/* ============ 01 分工 ============ */
.page-about .about-roles {
  display: grid;
  gap: 26px;
  margin-top: 30px;
}

.page-about .about-roles__side {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-roles__cards {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .role-card {
  position: relative;
  padding: 22px 20px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--amber);
  border-radius: 0 var(--about-cut) var(--about-cut) 0;
}

.page-about .role-card--red {
  border-left-color: var(--red);
}

.page-about .role-card--deep {
  border-left-color: var(--deep);
}

.page-about .role-card__num {
  position: absolute;
  top: 10px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: rgba(28, 31, 34, 0.08);
  pointer-events: none;
  user-select: none;
}

.page-about .role-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .role-card__title {
  margin: 0;
  font-family: var(--font-title);
  font-size: var(--fs-20);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--deep);
}

.page-about .role-card__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .role-card__list {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 1px dashed var(--about-line);
}

.page-about .role-card__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--slate);
}

.page-about .role-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--deep);
  transform: rotate(45deg);
}

.page-about .filter-empty {
  margin: 0;
  padding: 20px;
  background: #FFF6DC;
  border-left: 4px solid var(--amber-deep);
  border-radius: 0 var(--about-cut) var(--about-cut) 0;
  font-size: 14px;
  color: var(--ink);
}

/* ============ 02 规模 ============ */
.page-about .scale-grid {
  display: grid;
  gap: 1px;
  margin-top: 30px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .scale-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px 20px;
  background: var(--paper);
}

.page-about .scale-item__value {
  font-family: var(--font-mono);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--deep);
}

.page-about .scale-item__value--amber {
  color: var(--amber-deep);
}

.page-about .scale-item__value--red {
  color: var(--red);
}

.page-about .scale-item__label {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .scale-item__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

/* ============ 03 历程 ============ */
.page-about .history {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

.page-about .history__figure {
  margin: 0;
  position: relative;
}

.page-about .history__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 0 var(--about-cut) var(--about-cut) 0;
  filter: saturate(0.85) contrast(1.06);
}

.page-about .year-line {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .year-line::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--amber) 0%, var(--red) 58%, var(--deep) 100%);
}

.page-about .year-item {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .year-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--amber);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--amber-deep);
}

.page-about .year-item--current::before {
  background: var(--red);
  box-shadow: 0 0 0 1px var(--red-deep);
}

.page-about .year-item__details {
  border: 0;
}

.page-about .year-item__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 0 0 10px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .year-item__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--slate);
}

.page-about .year-item__details[open] .year-item__summary::after {
  content: "−";
}

.page-about .year-item__year {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--red);
}

.page-about .year-item__title {
  font-family: var(--font-title);
  font-size: var(--fs-16);
  font-weight: 900;
  color: var(--deep);
}

.page-about .year-item__body {
  padding: 0 0 6px;
}

.page-about .year-item__body p {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .year-item__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .year-item__facts li {
  padding: 4px 9px;
  border: 1px solid rgba(200, 154, 22, 0.42);
  border-radius: 999px;
  background: rgba(244, 196, 48, 0.22);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--deep);
}

/* ============ 04 合作与引用 ============ */
.page-about .partner-split {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

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

.page-about .partner-list li {
  display: grid;
  gap: 4px;
  padding: 18px 18px 18px 20px;
  background: var(--paper);
  border-left: 4px solid var(--deep);
}

.page-about .partner-list__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--red);
}

.page-about .partner-list__title {
  font-family: var(--font-title);
  font-size: var(--fs-16);
  font-weight: 900;
  color: var(--ink);
}

.page-about .partner-list__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .quote-format {
  margin-top: 24px;
  padding: 22px 20px;
  background: var(--deep);
  border-left: 4px solid var(--red);
  border-radius: 0 var(--about-cut) var(--about-cut) 0;
  color: var(--paper);
}

.page-about .quote-format__title {
  margin: 0 0 14px;
  font-family: var(--font-title);
  font-size: var(--fs-20);
  font-weight: 900;
  color: var(--amber);
}

.page-about .quote-format__list {
  margin: 0;
}

.page-about .quote-format__row {
  display: grid;
  gap: 3px;
  padding: 11px 0;
  border-top: 1px solid rgba(250, 246, 241, 0.14);
}

.page-about .quote-format__row:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .quote-format__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(250, 246, 241, 0.62);
}

.page-about .quote-format__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: #FFFFFF;
  word-break: break-word;
}

.page-about .partner-figure {
  margin: 0;
}

.page-about .partner-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--about-cut) 0 0 var(--about-cut);
  filter: saturate(0.95) contrast(1.05);
}

.page-about .partner-figure__cap {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

/* ============ 05 承诺与联系 ============ */
.page-about .about-promise {
  background:
    radial-gradient(90% 70% at 8% 0%, rgba(31, 122, 84, 0.4) 0%, rgba(11, 61, 46, 0) 62%),
    var(--deep);
  color: var(--paper);
}

.page-about .about-promise .chapter__title {
  color: #FFFFFF;
}

.page-about .about-promise .chapter__desc {
  color: rgba(250, 246, 241, 0.78);
}

.page-about .promise-grid {
  display: grid;
  gap: 1px;
  margin-top: 30px;
  background: rgba(250, 246, 241, 0.16);
  border: 1px solid rgba(250, 246, 241, 0.16);
}

.page-about .promise-item {
  padding: 24px 22px;
  background: var(--deep);
}

.page-about .promise-item__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .promise-item__label {
  display: block;
  margin: 10px 0 8px;
  font-family: var(--font-title);
  font-size: var(--fs-16);
  font-weight: 900;
  color: #FFFFFF;
}

.page-about .promise-item__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(250, 246, 241, 0.76);
}

.page-about .about-contact {
  display: grid;
  gap: 26px;
  margin-top: 34px;
  padding-top: 32px;
  border-top: 1px solid rgba(250, 246, 241, 0.18);
}

.page-about .about-contact__title {
  margin: 0 0 12px;
  font-family: var(--font-title);
  font-size: var(--fs-20);
  font-weight: 900;
  line-height: 1.4;
  color: #FFFFFF;
}

.page-about .about-contact__note {
  max-width: 52ch;
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(250, 246, 241, 0.76);
}

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

.page-about .about-promise .btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(250, 246, 241, 0.45);
}

.page-about .about-promise .btn--ghost:hover,
.page-about .about-promise .btn--ghost:focus-visible {
  color: var(--amber);
  border-color: var(--amber);
}

.page-about .about-contact__list {
  display: grid;
  gap: 1px;
  margin: 0;
  background: rgba(250, 246, 241, 0.16);
  border: 1px solid rgba(250, 246, 241, 0.16);
}

.page-about .about-contact__row {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  background: var(--deep);
}

.page-about .about-contact__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(250, 246, 241, 0.6);
}

.page-about .about-contact__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: #FFFFFF;
  word-break: break-word;
}

/* ============ 继续浏览 ============ */
.page-about .about-next-section {
  padding: 26px 0;
  background: var(--paper);
  border-top: 1px solid var(--about-line);
}

.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
}

.page-about .about-next__text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-next__link {
  position: relative;
  font-size: 15px;
  font-weight: 700;
  color: var(--deep);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 2px solid rgba(215, 38, 61, 0.28);
  transition: color 0.14s ease, border-color 0.14s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--red);
  border-color: var(--red);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding-bottom: 68px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 26px 0 84px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 52px;
    align-items: center;
    margin-top: 34px;
  }

  .page-about .about-roles {
    grid-template-columns: minmax(220px, 3fr) minmax(0, 9fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-roles__side {
    position: sticky;
    top: 88px;
  }

  .page-about .history {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .history__figure {
    position: sticky;
    top: 88px;
  }

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

  .page-about .about-contact {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 48px;
    align-items: start;
  }
}

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

  .page-about .partner-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .partner-figure {
    position: sticky;
    top: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__link,
  .page-about .role-card {
    transition: none;
  }
}