.page-about {
  --about-cut: 20px;
  --about-strong: rgba(244, 241, 232, .82);
  --about-soft-text: rgba(244, 241, 232, .70);
}

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

.page-about h2 {
  font-family: var(--font-display);
  font-size: var(--fs-section);
  line-height: 1.06;
  letter-spacing: -.02em;
  margin: 0 0 .55em;
  color: var(--paper);
}

.page-about h3 {
  font-family: var(--font-display);
  font-size: clamp(1.18rem, 2.4vw, 1.55rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: 0 0 .55em;
  color: var(--paper);
}

.page-about .about-crumb {
  padding-top: clamp(14px, 3vw, 26px);
}

.page-about .about-inline-link {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--signal-dim);
  margin-left: .35em;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  border-bottom-color: var(--signal);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 3vw, 30px) 0 clamp(28px, 5vw, 56px);
  background:
    radial-gradient(90% 120% at 88% -12%, rgba(79, 111, 90, .48), transparent 62%),
    linear-gradient(158deg, var(--ink-900) 0%, var(--ink-800) 56%, var(--ink-700) 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -12% -34% 38%;
  height: 58%;
  background: repeating-linear-gradient(90deg, rgba(139, 166, 184, .10) 0 1px, transparent 1px 46px);
  transform: skewY(-6deg);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 42px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6.4vw, 4rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--paper);
  margin: .35em 0 .55em;
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--signal);
}

.page-about .about-hero .lede {
  max-width: 60ch;
  color: var(--about-strong);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 28px);
}

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

.page-about .about-hero__media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  display: block;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .media__caption {
  font-size: .76rem;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--mist);
  margin-top: .65rem;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(24px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-facts li {
  background: rgba(11, 27, 43, .9);
  padding: clamp(14px, 2.4vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-facts b {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.6vw, 1.85rem);
  letter-spacing: -.01em;
  color: var(--signal);
}

.page-about .about-facts span {
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .about-trail {
  padding-block: clamp(38px, 7vw, 82px);
}

.page-about .about-trail__head {
  max-width: 66ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-trail__head .lede {
  color: var(--about-soft-text);
}

.page-about .about-trail__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-rail {
  align-self: start;
  min-width: 0;
}

.page-about .about-rail__title {
  font-family: var(--font-num);
  font-size: var(--fs-label);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--stone);
  margin: 0 0 .8em;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line-soft);
  background: rgba(14, 42, 36, .55);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .18s ease, background-color .18s ease, color .18s ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--signal);
  background: var(--signal-dim);
}

.page-about .about-rail__year {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: .95rem;
  color: var(--signal);
}

.page-about .about-rail__label {
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--about-soft-text);
}

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

.page-about .about-node {
  position: relative;
  padding-left: clamp(20px, 3.2vw, 34px);
  padding-bottom: clamp(28px, 5vw, 52px);
  border-left: 1px solid var(--line);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, .14);
}

.page-about .about-node__year {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--signal);
  margin-bottom: .5em;
}

.page-about .about-node p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--about-soft-text);
  max-width: 64ch;
}

.page-about .about-node__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

/* ---------- 横向主题带 ---------- */
.page-about .about-band {
  position: relative;
  padding-block: clamp(32px, 5.5vw, 68px);
  background: linear-gradient(115deg, rgba(14, 42, 36, .88) 0%, rgba(11, 27, 43, .95) 58%, rgba(8, 21, 33, .96) 100%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: clamp(64px, 20%, 220px);
  height: 3px;
  background: var(--signal);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

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

.page-about .about-team__media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  display: block;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

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

.page-about .about-team__intro {
  margin: 0 0 clamp(18px, 3vw, 26px);
  font-size: .98rem;
  line-height: 1.85;
  color: var(--about-soft-text);
  max-width: 58ch;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .about-roles li {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  min-width: 0;
}

.page-about .about-roles .idx {
  display: block;
  font-family: var(--font-num);
  font-size: var(--fs-label);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: .6em;
}

.page-about .about-roles strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.12rem;
  letter-spacing: .01em;
  color: var(--paper);
  margin-bottom: .3em;
}

.page-about .about-roles p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--about-soft-text);
}

/* ---------- 流程 ---------- */
.page-about .about-flow-section {
  padding-block: clamp(36px, 6vw, 74px);
}

.page-about .about-flow-section .lede {
  color: var(--about-soft-text);
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-flow li {
  background: rgba(11, 27, 43, .92);
  padding: clamp(14px, 2.4vw, 22px);
  min-width: 0;
}

.page-about .about-flow span {
  display: block;
  font-family: var(--font-num);
  font-size: var(--fs-label);
  letter-spacing: .16em;
  color: var(--signal);
  margin-bottom: .7em;
}

.page-about .about-flow strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.08rem;
  letter-spacing: .02em;
  color: var(--paper);
  margin-bottom: .35em;
}

.page-about .about-flow p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.72;
  color: var(--about-soft-text);
}

/* ---------- 版本对照 ---------- */
.page-about .about-version {
  padding-block: clamp(36px, 6vw, 74px);
  background: linear-gradient(200deg, rgba(79, 111, 90, .16), transparent 62%);
}

.page-about .about-version .lede {
  color: var(--about-soft-text);
}

.page-about .about-version__media {
  margin: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .about-version__media img {
  width: 100%;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  display: block;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-compare {
  display: grid;
  gap: clamp(16px, 3vw, 28px);
  margin-top: clamp(20px, 3.4vw, 34px);
}

.page-about .about-compare__panel {
  background: rgba(14, 42, 36, .55);
  border: 1px solid var(--line);
  padding: clamp(18px, 3vw, 28px);
  min-width: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-compare__panel--old {
  background: rgba(11, 27, 43, .8);
  border-style: dashed;
  border-color: rgba(242, 193, 78, .38);
}

.page-about .about-compare__panel h3 {
  font-size: 1.1rem;
  padding-bottom: .6em;
  margin-bottom: .8em;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-compare__panel--old h3 {
  color: var(--warm);
}

.page-about .about-compare__panel ul {
  margin: 0;
  padding-left: 1.1em;
  display: grid;
  gap: .65em;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--about-soft-text);
}

/* ---------- 合作 ---------- */
.page-about .about-partner__lede {
  max-width: 66ch;
  margin: 0 0 clamp(18px, 3vw, 28px);
  font-size: .98rem;
  line-height: 1.85;
  color: var(--about-strong);
}

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

.page-about .about-partner__list li {
  background: rgba(8, 21, 33, .88);
  padding: clamp(14px, 2.4vw, 20px);
  min-width: 0;
}

.page-about .about-partner__list b {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  color: var(--paper);
  margin-bottom: .25em;
}

.page-about .about-partner__list li:nth-child(1) b,
.page-about .about-partner__list li:nth-child(4) b {
  color: var(--signal);
}

.page-about .about-partner__list span {
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-partner__note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--about-soft-text);
  max-width: 68ch;
}

/* ---------- 内容标准 ---------- */
.page-about .about-standards {
  padding-block: clamp(34px, 6vw, 70px);
}

.page-about .about-standards__panel {
  background: var(--paper);
  color: var(--ink-900);
  padding: clamp(22px, 4vw, 46px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .about-standards__panel .eyebrow {
  color: var(--moss);
}

.page-about .about-standards__panel h2 {
  color: var(--ink-900);
}

.page-about .about-standards__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .about-standards__list li {
  border-top: 2px solid rgba(11, 27, 43, .14);
  padding-top: 12px;
  min-width: 0;
}

.page-about .about-standards__list strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.14rem;
  letter-spacing: .01em;
  color: var(--ink-800);
  margin-bottom: .35em;
}

.page-about .about-standards__list p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: rgba(11, 27, 43, .78);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  padding-block: clamp(34px, 6vw, 72px);
}

.page-about .about-cta__inner {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, rgba(200, 255, 61, .14), rgba(14, 42, 36, .72) 58%, rgba(11, 27, 43, .92));
  border: 1px solid rgba(200, 255, 61, .28);
  padding: clamp(22px, 4vw, 44px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-cta__inner::after {
  content: "";
  position: absolute;
  right: -50px;
  top: -70px;
  width: 190px;
  height: 190px;
  background: radial-gradient(circle, rgba(200, 255, 61, .26), transparent 70%);
  pointer-events: none;
}

.page-about .about-cta__inner p {
  position: relative;
  margin: 0;
  font-size: .98rem;
  line-height: 1.8;
  color: var(--about-strong);
  max-width: 56ch;
}

.page-about .about-cta__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

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

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-trail__grid {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(28px, 5vw, 62px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__list li {
    margin-left: -1px;
  }

  .page-about .about-rail__list a {
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    padding: 10px 0 10px 16px;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--signal);
    background: var(--signal-dim);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

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

@media (min-width: 1080px) {
  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

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