.page-about {
  --about-pad: clamp(18px, 3vw, 28px);
  --about-soft: #c2cfc7;
  background: var(--char);
  color: var(--white);
  overflow-x: hidden;
}

.page-about .section {
  padding-block: clamp(44px, 7vw, 88px);
}

.page-about .section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  font-weight: 800;
}

.page-about .eyebrow {
  letter-spacing: 0.14em;
  font-size: 11px;
  margin-bottom: 12px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(14px, 3vw, 26px) clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  background: var(--char);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(42, 58, 51, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 58, 51, 0.5) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, #000 0%, #000 52%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 52%, transparent 100%);
}

.page-about .about-hero .crumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(18px, 4vw, 34px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 58px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.2vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin: 0 0 18px;
}

.page-about .about-hero .lede {
  max-width: 54ch;
  color: var(--about-soft);
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.85;
  margin: 0;
}

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

.page-about .about-hero__panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: var(--about-pad);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 3px;
  background: var(--lime);
  transform-origin: left center;
}

.page-about .about-hero__panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__stamp {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--panel);
  padding: 14px 14px 16px;
}

.page-about .about-hero__stats .num {
  color: var(--lime);
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  line-height: 1.1;
  font-weight: 600;
}

.page-about .about-hero__stat-label {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  align-items: start;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-origin__text p {
  margin: 0 0 1em;
  max-width: 60ch;
  color: var(--about-soft);
  line-height: 1.85;
}

.page-about .about-origin__frame {
  margin: 0;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.page-about .about-origin__frame .frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 团队 ---------- */
.page-about .about-team .section__head {
  max-width: 64ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-team__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .about-team__roles {
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  position: relative;
  background: rgba(11, 15, 13, 0.62);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  padding: 18px 18px 20px;
  transition: border-left-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-left-color: var(--lime);
  transform: translateX(4px);
}

.page-about .about-role__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.page-about .about-role__index {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-role__count {
  font-size: 13px;
  color: var(--lime);
}

.page-about .about-role__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  margin: 0 0 8px;
  font-weight: 700;
}

.page-about .about-role__desc {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-role__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-team__frame {
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.page-about .about-team__frame .frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 方法 ---------- */
.page-about .about-method .section__head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 3vw, 36px);
}

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

.page-about .about-method__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-method__num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  padding-top: 4px;
}

.page-about .about-method__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  font-weight: 700;
}

.page-about .about-method__desc {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 历程 ---------- */
.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  align-items: start;
}

.page-about .about-timeline__intro p {
  margin: 0;
  max-width: 46ch;
  color: var(--about-soft);
  line-height: 1.85;
}

.page-about .about-timeline__frame {
  margin: 24px 0 0;
  aspect-ratio: 2 / 1;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-timeline__frame .frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line);
}

.page-about .about-track__item {
  position: relative;
  padding-bottom: 14px;
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 20px;
  width: 9px;
  height: 9px;
  background: var(--lime);
  transform: translateX(-50%) rotate(45deg);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.14);
}

.page-about .about-node {
  background: rgba(11, 15, 13, 0.6);
  border: 1px solid var(--line);
}

.page-about .about-node[open] {
  border-color: rgba(200, 255, 61, 0.45);
}

.page-about .about-node__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--lime);
}

.page-about .about-node[open] .about-node__summary::after {
  content: "\2013";
}

.page-about .about-node__year {
  font-size: 1.1rem;
  color: var(--lime);
  letter-spacing: 0.04em;
  min-width: 58px;
}

.page-about .about-node__title {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.02em;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-node__body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 生态矩阵 ---------- */
.page-about .about-eco .section__head {
  max-width: 64ch;
  margin-bottom: clamp(24px, 3vw, 36px);
}

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

.page-about .about-matrix__cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--char);
  padding: clamp(18px, 2.4vw, 26px);
  transition: background-color 0.24s var(--ease);
}

.page-about .about-matrix__cell:hover {
  background: var(--forest);
}

.page-about .about-matrix__code {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
  margin-bottom: 6px;
}

.page-about .about-matrix__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.02em;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-matrix__value {
  margin: 4px 0 2px;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1.1;
  color: var(--lime);
  font-weight: 600;
}

.page-about .about-matrix__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 联系 ---------- */
.page-about .about-service {
  background: var(--paper);
  color: var(--ink);
  clip-path: polygon(0 22px, 100% 0, 100% 100%, 0 100%);
  padding-block: clamp(56px, 8vw, 96px) clamp(48px, 7vw, 80px);
}

.page-about .about-service .eyebrow {
  color: #8a4a12;
}

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

.page-about .about-service__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-service__main p {
  max-width: 58ch;
  line-height: 1.85;
  color: rgba(26, 21, 17, 0.82);
  margin: 0 0 1em;
}

.page-about .about-service__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-service__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  padding: 11px 0;
  border-top: 1px solid rgba(26, 21, 17, 0.2);
}

.page-about .about-service__list li:last-child {
  border-bottom: 1px solid rgba(26, 21, 17, 0.2);
}

.page-about .about-service__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(26, 21, 17, 0.62);
  min-width: 84px;
}

.page-about .about-service__value {
  font-family: var(--font-mono);
  font-size: 14.5px;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-service__aside {
  border: 1px solid rgba(26, 21, 17, 0.25);
  padding: clamp(16px, 2.6vw, 24px);
  background: rgba(255, 255, 255, 0.28);
}

.page-about .about-service__aside-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(26, 21, 17, 0.62);
}

.page-about .about-service__actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-service .btn--ghost {
  border-color: rgba(26, 21, 17, 0.4);
  color: var(--ink);
}

.page-about .about-service__aside-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(26, 21, 17, 0.7);
}

/* ---------- 焦点态 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-service a:focus-visible,
.page-about .about-service summary:focus-visible {
  outline-color: #8a4a12;
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about .about-hero__panel::before {
    animation: about-pulse 3.6s ease-in-out infinite;
  }
}

@keyframes about-pulse {
  0%,
  100% {
    opacity: 1;
    transform: scaleX(1);
  }
  50% {
    opacity: 0.5;
    transform: scaleX(0.7);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-matrix__cell,
  .page-about .about-hero__panel::before {
    transition: none;
    animation: none;
  }
  .page-about .about-role:hover,
  .page-about .about-role:focus-within {
    transform: none;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 599px) {
  .page-about .about-hero h1 br {
    display: none;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-track {
    padding-left: 20px;
  }
  .page-about .about-track__item::before {
    left: -20px;
  }
}

@media (min-width: 720px) {
  .page-about .about-matrix {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .about-matrix__cell:nth-child(1) {
    grid-column: span 3;
  }
  .page-about .about-matrix__cell:nth-child(2) {
    grid-column: span 3;
  }
  .page-about .about-matrix__cell:nth-child(3) {
    grid-column: span 2;
  }
  .page-about .about-matrix__cell:nth-child(4) {
    grid-column: span 4;
  }
  .page-about .about-matrix__cell:nth-child(5) {
    grid-column: span 4;
  }
  .page-about .about-matrix__cell:nth-child(6) {
    grid-column: span 2;
  }
}

@media (min-width: 780px) {
  .page-about .about-method__item {
    grid-template-columns: 64px minmax(0, 0.8fr) minmax(0, 1.6fr);
    align-items: baseline;
    padding: 22px 0;
  }
  .page-about .about-method__desc {
    grid-column: 3;
  }
}

@media (min-width: 860px) {
  .page-about .about-service__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
  }
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 940px) {
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }
}