.page-about {
  overflow-x: clip;
  --about-axis: 46px;
}

@media (min-width: 760px) {
  .page-about {
    --about-axis: 72px;
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 5vw, 52px) clamp(44px, 7vw, 84px);
  background-image:
    radial-gradient(130% 100% at 88% 0%, rgba(61, 90, 115, 0.32), transparent 62%),
    repeating-linear-gradient(0deg, rgba(138, 154, 163, 0.06) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(90deg, rgba(138, 154, 163, 0.06) 0 1px, transparent 1px 46px);
}

.page-about .about-hero .zl-breadcrumb {
  margin-bottom: clamp(20px, 4vw, 36px);
}

.page-about .about-hero__sep {
  margin-inline: 8px;
  color: var(--zl-slate);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 48px);
  align-items: end;
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  }
  .page-about .about-hero__fig {
    margin-top: -24px;
  }
}

.page-about .about-hero__text .zl-lead {
  max-width: 56ch;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(18px, 3vw, 28px);
}

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

.page-about .about-hero__fig img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--zl-radius);
  border: 1px solid var(--zl-line);
  filter: saturate(0.86) contrast(1.02);
}

@media (min-width: 920px) {
  .page-about .about-hero__fig::before {
    content: "";
    position: absolute;
    inset: 14px -12px -12px 14px;
    border: 1px solid var(--zl-amber);
    border-radius: var(--zl-radius);
    opacity: 0.55;
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-block: clamp(44px, 7vw, 86px);
  border-top: 1px solid var(--zl-line);
}

.page-about .about-sec__title {
  margin: 10px 0 clamp(22px, 3.5vw, 36px);
  font-family: var(--zl-font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--zl-paper);
  max-width: 24ch;
}

.page-about .about-sec--paper {
  background: var(--zl-paper-2);
  color: var(--zl-ink);
  border-top-color: transparent;
}

.page-about .about-sec--paper .about-sec__title {
  color: var(--zl-ink);
}

.page-about .about-sec--paper .zl-eyebrow {
  color: var(--zl-red);
}

/* ---------- 起点 ---------- */
.page-about .about-start__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

@media (min-width: 860px) {
  .page-about .about-start__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

.page-about .about-start__prose p {
  margin-top: 0;
}

.page-about .about-start__side {
  border-left: 2px solid var(--zl-red);
  padding: 6px 0 6px clamp(16px, 2.4vw, 24px);
}

.page-about .about-start__figure {
  margin: 0;
  font-family: var(--zl-font-mono);
  font-size: clamp(2.4rem, 7vw, 3.3rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--zl-red);
}

.page-about .about-start__label {
  margin: 10px 0 0;
  color: var(--zl-slate);
  font-size: 0.92rem;
  line-height: 1.75;
}

.page-about .about-start__note {
  margin-top: clamp(28px, 4.5vw, 48px);
}

.page-about .about-start__note p {
  margin: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 0 0 clamp(30px, 5vw, 56px);
  padding: 0;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: calc(var(--about-axis) - 1px);
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--zl-red) 0,
    var(--zl-line) 18%,
    var(--zl-line) 80%,
    rgba(31, 58, 86, 0) 100%
  );
}

.page-about .about-tl__item {
  display: grid;
  grid-template-columns: var(--about-axis) minmax(0, 1fr);
  column-gap: clamp(14px, 2.6vw, 30px);
  padding-block: 16px;
  position: relative;
}

.page-about .about-tl__item::after {
  content: "";
  position: absolute;
  left: calc(var(--about-axis) - 5px);
  top: 26px;
  width: 10px;
  height: 10px;
  background: var(--zl-amber);
  transform: rotate(45deg);
  z-index: 1;
}

.page-about .about-tl__item--now::after {
  background: var(--zl-red);
}

.page-about .about-tl__side {
  display: block;
  padding-top: 18px;
  text-align: right;
  padding-right: 14px;
}

.page-about .about-tl__num {
  display: inline-block;
  font-family: var(--zl-font-mono);
  font-size: clamp(1rem, 2.2vw, 1.3rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--zl-slate);
  text-decoration: none;
  transition: color 180ms var(--zl-ease);
}

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

.page-about .about-tl__num.is-current {
  color: var(--zl-red);
}

.page-about .about-tl__card {
  position: relative;
  background: var(--zl-ink-2);
  border: 1px solid var(--zl-line);
  border-radius: var(--zl-radius);
  padding: clamp(16px, 2.4vw, 24px);
  scroll-margin-top: 110px;
  transition: border-color 180ms var(--zl-ease), transform 180ms var(--zl-ease);
}

.page-about .about-tl__card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 22px;
  width: 44px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--zl-blue);
}

.page-about .about-tl__item--now .about-tl__card {
  border-color: rgba(192, 57, 43, 0.55);
  background-image: linear-gradient(180deg, rgba(192, 57, 43, 0.09), transparent 62%);
}

.page-about .about-tl__item--now .about-tl__card::after {
  background: var(--zl-red);
}

@media (hover: hover) {
  .page-about .about-tl__card:hover {
    border-color: var(--zl-blue);
    transform: translateX(3px);
  }
}

.page-about .about-tl__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 10px;
}

.page-about .about-tl__tag {
  display: inline-block;
  font-family: var(--zl-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--zl-slate);
  border: 1px solid var(--zl-line);
  border-radius: 999px;
  padding: 2px 10px;
}

.page-about .about-tl__tag--red {
  color: var(--zl-red);
  border-color: rgba(192, 57, 43, 0.55);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--zl-font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.1vw, 1.22rem);
  line-height: 1.36;
  letter-spacing: -0.008em;
  color: var(--zl-paper);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.82;
  color: var(--zl-slate);
}

/* ---------- 图 ---------- */
.page-about .about-fig {
  margin: 0;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--zl-radius);
  border: 1px solid var(--zl-line);
}

.page-about .about-fig figcaption {
  margin-top: 10px;
  font-family: var(--zl-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--zl-slate);
}

/* ---------- 双版本线 ---------- */
.page-about .about-lines__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .about-lines__tab {
  appearance: none;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.2;
  color: var(--zl-slate);
  background: transparent;
  border: 1px solid var(--zl-line);
  border-radius: var(--zl-radius-sm);
  padding: 11px 18px;
  cursor: pointer;
  transition: color 180ms var(--zl-ease), border-color 180ms var(--zl-ease),
    background-color 180ms var(--zl-ease);
}

.page-about .about-lines__tab:hover,
.page-about .about-lines__tab:focus-visible {
  color: var(--zl-paper);
  border-color: var(--zl-blue);
}

.page-about .about-lines__tab[aria-selected="true"] {
  color: var(--zl-amber);
  border-color: rgba(224, 166, 75, 0.65);
  background: rgba(224, 166, 75, 0.1);
}

.page-about .about-lines__panel {
  border: 1px solid var(--zl-line);
  border-radius: var(--zl-radius);
  background: var(--zl-ink-2);
  padding: clamp(20px, 3.4vw, 34px);
}

.page-about .about-lines__panel[hidden] {
  display: none;
}

.page-about .about-lines__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--zl-paper);
}

.page-about .about-lines__items {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-lines__items li {
  position: relative;
  padding-left: 22px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--zl-slate);
}

.page-about .about-lines__items li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 12px;
  width: 6px;
  height: 6px;
  background: var(--zl-blue);
  transform: rotate(45deg);
}

/* ---------- 团队 ---------- */
.page-about .about-team__intro {
  margin: -8px 0 clamp(22px, 3.4vw, 32px);
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--zl-slate);
}

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

.page-about .about-team__item {
  border: 1px solid var(--zl-line);
  border-radius: var(--zl-radius);
  background: rgba(22, 40, 60, 0.52);
  overflow: hidden;
}

.page-about .about-team__item[open] {
  border-color: var(--zl-blue);
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px clamp(16px, 2.4vw, 24px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-team__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--zl-font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--zl-amber);
}

.page-about .about-team__item[open] .about-team__head::after {
  content: "–";
}

.page-about .about-team__head:focus-visible {
  outline: 2px solid var(--zl-amber);
  outline-offset: -2px;
}

.page-about .about-team__index {
  font-family: var(--zl-font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--zl-red);
}

.page-about .about-team__name {
  font-family: var(--zl-font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2vw, 1.14rem);
  color: var(--zl-paper);
}

.page-about .about-team__hint {
  font-size: 0.82rem;
  color: var(--zl-slate);
}

.page-about .about-team__body {
  padding: 0 clamp(16px, 2.4vw, 24px) clamp(16px, 2.4vw, 22px);
  padding-left: calc(clamp(16px, 2.4vw, 24px) + 14px);
}

.page-about .about-team__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--zl-slate);
}

.page-about .about-team__pulse {
  margin-top: clamp(22px, 3.4vw, 34px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 720px) {
  .page-about .about-team__pulse {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-team__pulse > div {
  border-left: 2px solid var(--zl-red);
  padding-left: 16px;
}

.page-about .about-team__pulse strong {
  display: block;
  font-family: var(--zl-font-mono);
  font-size: clamp(1.3rem, 3vw, 1.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--zl-paper);
}

.page-about .about-team__pulse span {
  display: block;
  margin-top: 6px;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--zl-slate);
}

/* ---------- 适配清单 ---------- */
.page-about .about-spec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .about-spec__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-spec__fig {
    position: sticky;
    top: 108px;
  }
}

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

.page-about .about-spec__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--zl-radius);
  border: 1px solid rgba(14, 27, 42, 0.16);
}

.page-about .about-spec__intro {
  margin: 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--zl-slate-2);
}

.page-about .about-spec__steps {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: spec;
}

.page-about .about-spec__steps li {
  position: relative;
  padding-left: 52px;
  min-height: 28px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--zl-slate-2);
  counter-increment: spec;
}

.page-about .about-spec__steps li::before {
  content: counter(spec, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--zl-font-mono);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--zl-red);
}

.page-about .about-spec__foot {
  margin: 0;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--zl-slate-2);
}

/* ---------- 定位理念 ---------- */
.page-about .about-rule {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 26px);
}

@media (min-width: 820px) {
  .page-about .about-rule {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-rule__item {
  border-top: 2px solid var(--zl-line);
  padding-top: 18px;
}

.page-about .about-rule__item:nth-child(1) {
  border-top-color: var(--zl-red);
}

.page-about .about-rule__item:nth-child(2) {
  border-top-color: var(--zl-amber);
}

.page-about .about-rule__item:nth-child(3) {
  border-top-color: var(--zl-blue);
}

.page-about .about-rule__title {
  margin: 0 0 10px;
  font-family: var(--zl-font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 2vw, 1.16rem);
  line-height: 1.4;
  color: var(--zl-paper);
}

.page-about .about-rule__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.82;
  color: var(--zl-slate);
}

/* ---------- 归属与联系 ---------- */
.page-about .about-end__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
}

@media (min-width: 880px) {
  .page-about .about-end__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

.page-about .about-end__main .zl-prose p {
  margin-top: 0;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 32px);
}

.page-about .about-end__card {
  border: 1px solid var(--zl-line);
  border-radius: var(--zl-radius);
  background: var(--zl-ink-2);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-end__label {
  margin: 0 0 16px;
  font-family: var(--zl-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--zl-amber);
}

.page-about .about-end__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin: 0 0 16px;
}

.page-about .about-end__key {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--zl-slate);
}

.page-about .about-end__val {
  font-family: var(--zl-font-mono);
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--zl-paper);
  word-break: break-word;
}

a.about-end__val {
  text-decoration: none;
  border-bottom: 1px dashed rgba(224, 166, 75, 0.55);
  transition: color 180ms var(--zl-ease), border-color 180ms var(--zl-ease);
}

a.about-end__val:hover,
a.about-end__val:focus-visible {
  color: var(--zl-amber);
  border-bottom-color: var(--zl-amber);
}

.page-about .about-end__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--zl-line);
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--zl-slate);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__card,
  .page-about .about-lines__tab,
  .page-about .about-tl__num,
  a.about-end__val {
    transition: none;
  }
  .page-about .about-tl__card:hover {
    transform: none;
  }
}