.page-about {
  background: var(--void);
  color: var(--text);
  overflow-x: hidden;
}

.page-about .about-crumb {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.75rem, 4vw, 3rem) clamp(3rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--grid);
  background-image:
    linear-gradient(rgba(42, 49, 61, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 49, 61, 0.4) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -30% -20% auto auto;
  width: min(680px, 80vw);
  height: min(680px, 80vw);
  background:
    radial-gradient(circle at 62% 38%, rgba(123, 92, 255, 0.3), transparent 62%),
    radial-gradient(circle at 32% 68%, rgba(47, 243, 214, 0.16), transparent 58%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 1rem;
}

.page-about .about-eyebrow__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.03em;
  margin: 0;
  max-width: 18ch;
}

.page-about .about-hero__intro {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.25vw, 1.125rem);
  line-height: 1.85;
  color: var(--muted);
  margin: clamp(1.25rem, 2.5vw, 1.75rem) 0 0;
  max-width: 46ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

/* 首屏章节索引面板 */
.page-about .about-index {
  background: rgba(18, 22, 31, 0.92);
  border: 1px solid var(--grid);
  padding: clamp(1.15rem, 2.4vw, 1.6rem);
  clip-path: var(--clip-panel);
}

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1rem;
}

.page-about .about-index__list {
  display: grid;
  gap: 0.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index__link {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.5rem 0.35rem;
  font-size: 0.9rem;
  color: var(--text);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: rgba(47, 243, 214, 0.08);
  border-left-color: var(--cyan);
}

.page-about .about-index__link[aria-current="true"] {
  background: rgba(47, 243, 214, 0.1);
  border-left-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-index .rule {
  margin: 1.1rem 0;
}

.page-about .about-readouts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 0.75rem;
  margin: 0;
}

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

.page-about .about-readouts__value {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.6vw, 1.85rem);
  line-height: 1.1;
  color: var(--cyan);
  margin: 0;
}

.page-about .about-readouts__label {
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--muted);
  margin-top: 0.25rem;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-block: clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-head {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-head .section-head__index {
  display: block;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(47, 243, 214, 0.32);
  margin-bottom: 0.6rem;
}

.page-about .about-head .section-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 0.9rem;
  max-width: 22ch;
}

.page-about .about-head .section-head__note {
  font-family: var(--font-serif);
  font-size: clamp(0.95rem, 1.15vw, 1.05rem);
  line-height: 1.85;
  color: var(--muted);
  margin: 0;
  max-width: 52ch;
}

.page-about .about-head--onblue .section-head__title {
  color: var(--text);
}

.page-about .about-head--onpaper .section-head__index {
  color: rgba(26, 27, 30, 0.22);
}

.page-about .about-head--onpaper .section-head__title {
  color: var(--ink);
}

.page-about .about-head--onpaper .section-head__note {
  color: rgba(26, 27, 30, 0.72);
}

/* ---------- 01 做法 ---------- */
.page-about .about-approach {
  align-items: start;
}

.page-about .about-prose {
  max-width: 62ch;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
}

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

.page-about .about-map {
  background: var(--blueprint);
  border: 1px solid var(--grid);
  padding: clamp(1.25rem, 2.5vw, 1.75rem);
  clip-path: var(--clip-panel);
}

.page-about .about-map__title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 1.25rem;
}

.page-about .about-map__list {
  display: grid;
  gap: 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-map__list li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 0.75rem;
  align-items: start;
}

.page-about .about-map__list .dot {
  width: 8px;
  height: 8px;
  margin-top: 0.5rem;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-map__list li:nth-child(2) .dot {
  background: var(--violet);
}

.page-about .about-map__list li:nth-child(3) .dot {
  background: var(--orange);
}

.page-about .about-map__list strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 0.2rem;
}

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

.page-about .about-map__foot {
  margin: 1.35rem 0 0;
  padding-top: 1rem;
  border-top: 1px dashed var(--grid);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 02 流程 ---------- */
.page-about .about-section--process {
  border-block: 1px solid var(--grid);
}

.page-about .about-process {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 2.75rem);
  align-items: start;
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-flow__item {
  position: relative;
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0 1rem;
  padding-bottom: clamp(1.5rem, 3vw, 2rem);
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  left: 1.2rem;
  top: 2.4rem;
  bottom: 0.2rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--grid));
  opacity: 0.65;
}

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

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

.page-about .about-flow__num {
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--blueprint);
  clip-path: var(--clip-btn);
}

.page-about .about-flow__body h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  margin: 0.55rem 0 0.4rem;
  color: var(--text);
}

.page-about .about-flow__body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 48ch;
}

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

.page-about .media-frame img {
  display: block;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(0.85rem, 2vw, 1.25rem);
}

.page-about .about-role {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(1.1rem, 2.4vw, 1.5rem);
  background: var(--blueprint);
  border: 1px solid var(--grid);
  clip-path: var(--clip-panel);
  transition: border-color 0.22s ease, transform 0.22s ease;
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .about-role__count {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
  line-height: 1;
  color: var(--cyan);
  margin: 0 0 0.5rem;
}

.page-about .about-role__name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.55rem;
  color: var(--text);
}

.page-about .about-role__desc {
  margin: 0 0 1.5rem;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-role__bar {
  display: block;
  height: 3px;
  margin-top: auto;
  background: var(--cyan);
}

.page-about .about-role:nth-child(1) .about-role__bar { width: 34%; }
.page-about .about-role:nth-child(2) .about-role__bar { width: 28%; background: var(--violet); }
.page-about .about-role:nth-child(3) .about-role__bar { width: 22%; background: var(--cyan); }
.page-about .about-role:nth-child(4) .about-role__bar { width: 16%; background: var(--orange); }

/* ---------- 04 时间轴 ---------- */
.page-about .about-section--timeline {
  border-top: 1px solid var(--grid);
}

.page-about .about-timeline {
  margin-top: 0.5rem;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(1.6rem, 3vw, 2rem) 2rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 1.4rem;
  bottom: 0.2rem;
  width: 1px;
  background: var(--grid);
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--cyan);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-timeline__item--now .about-timeline__node {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.16);
}

.page-about .about-timeline__item:hover .about-timeline__node {
  background: var(--cyan);
}

.page-about .about-timeline__item--now:hover .about-timeline__node {
  background: var(--orange);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin-bottom: 0.35rem;
}

.page-about .about-timeline__item--now .about-timeline__year {
  color: var(--orange);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.35rem;
  color: var(--text);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 34ch;
}

.page-about .about-timeline__link {
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  padding-top: 1.1rem;
  border-top: 1px dashed var(--grid);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-timeline__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 214, 0.4);
}

.page-about .about-timeline__link a:hover,
.page-about .about-timeline__link a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 05 协作生态（暖纸色带） ---------- */
.page-about .about-section--eco {
  border-block: 1px solid var(--grid);
}

.page-about .about-eco {
  align-items: start;
  row-gap: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-eco__body p {
  margin: 0 0 1.05em;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(26, 27, 30, 0.78);
  max-width: 54ch;
}

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

.page-about .about-eco__facts {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 0.75rem;
  border-top: 1px solid rgba(26, 27, 30, 0.16);
  padding-top: 1.25rem;
}

.page-about .about-eco__facts li {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
}

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  line-height: 1.1;
  color: #10806F;
}

.page-about .about-eco__facts li span:last-child {
  font-size: 0.78rem;
  line-height: 1.55;
  color: rgba(26, 27, 30, 0.68);
}

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

.page-about .about-eco__figure img {
  max-height: 520px;
  object-position: center;
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
  align-items: start;
}

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

.page-about .about-next__stats li {
  display: grid;
  grid-template-columns: minmax(5.5rem, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 1rem;
  padding: 0.95rem 1.1rem;
  background: var(--void);
}

.page-about .about-next__num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-next__stats p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-next__cta {
  background: var(--blueprint);
  border: 1px solid var(--grid);
  padding: clamp(1.25rem, 3vw, 1.85rem);
  clip-path: var(--clip-panel);
}

.page-about .about-next__cta h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.7rem;
  color: var(--text);
}

.page-about .about-next__cta > p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.35rem;
}

.page-about .about-next__more {
  margin: 1.35rem 0 0 !important;
  padding-top: 1rem;
  border-top: 1px dashed var(--grid);
  font-size: 0.85rem !important;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-next__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 214, 0.4);
}

.page-about .about-next__more a:hover,
.page-about .about-next__more a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2.5rem, 4vw, 4rem);
  }

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

  .page-about .about-process {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

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

  .page-about .about-timeline__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: clamp(1rem, 2vw, 1.75rem);
    border-top: 1px solid var(--grid);
    padding-top: 1.6rem;
  }

  .page-about .about-timeline__item {
    padding: 0;
  }

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

  .page-about .about-timeline__node {
    top: calc(-1.6rem - 8px);
    left: 0;
  }

  .page-about .about-next {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

@media (min-width: 1100px) {
  .page-about .about-eco__figure img {
    max-height: 560px;
  }
}

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

  .page-about .about-role:hover,
  .page-about .about-role:focus-within {
    transform: none;
  }
}
</main>