.page-about {
  --about-rail: 172px;
  --about-gap: clamp(1.75rem, 4.5vw, 4rem);
  --about-pad-y: clamp(3.25rem, 7vh, 6rem);
  --about-body-max: 68ch;
  position: relative;
  overflow-x: clip;
  color: var(--card);
  background:
    radial-gradient(120% 70% at 100% 0%, rgba(11, 79, 108, 0.42), transparent 60%),
    var(--ink);
  padding-bottom: clamp(1rem, 3vh, 2rem);
}

.page-about > .breadcrumb {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(5.5rem, 11vh, 7rem) var(--gutter) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(1.5rem, 3vh, 2.5rem) var(--gutter) clamp(2.25rem, 5vh, 3.5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -12% -18% -6% -18%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(52% 46% at 84% 6%, rgba(53, 242, 208, 0.16), transparent 70%),
    radial-gradient(66% 58% at 4% 96%, rgba(29, 122, 158, 0.34), transparent 72%),
    linear-gradient(180deg, rgba(11, 79, 108, 0.45), transparent 76%);
}

.page-about .about-hero .eyebrow {
  color: var(--sand-mute);
  letter-spacing: 0.22em;
  margin-bottom: clamp(0.9rem, 2vh, 1.4rem);
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(2.5rem, 7.4vw, 6.2rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 900;
  color: var(--sand);
  text-wrap: balance;
  max-width: 18em;
}

.page-about .about-lede {
  margin: clamp(1.15rem, 2.5vh, 1.75rem) 0 0;
  max-width: 42ch;
  font-size: var(--step-1);
  line-height: 1.65;
  color: rgba(247, 243, 234, 0.88);
}

.page-about .about-figures {
  margin: clamp(2rem, 5vh, 3.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-figures > div {
  border-top: 1px solid var(--line);
  padding-top: 0.85rem;
}

.page-about .about-figures dt {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  color: var(--mist);
  margin-bottom: 0.35rem;
}

.page-about .about-figures dd {
  margin: 0;
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--card);
}

@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

/* ---------- 通用分区骨架 ---------- */
.page-about .about-section {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: var(--about-pad-y) var(--gutter);
}

.page-about .about-row {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: start;
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: rgba(232, 211, 169, 0.22);
  -webkit-text-stroke: 1px rgba(232, 211, 169, 0.5);
}

.page-about .about-rail-label {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  color: var(--mist);
  text-transform: none;
}

.page-about .about-body h2 {
  margin: 0 0 1.1rem;
  font-size: var(--step-3);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--sand);
}

.page-about .about-body > p {
  max-width: var(--about-body-max);
  margin: 0 0 1.15rem;
  font-size: var(--step-0);
  line-height: 1.85;
  color: rgba(247, 243, 234, 0.84);
}

.page-about .about-body > p a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 0.22em;
  text-decoration-thickness: 1px;
}

.page-about .about-body > p a:hover,
.page-about .about-body > p a:focus-visible {
  color: var(--sand);
}

.page-about .about-pull {
  margin: clamp(1.6rem, 4vh, 2.4rem) 0;
  padding-left: 1.15rem;
  border-left: 2px solid var(--terracotta);
  max-width: 30ch;
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.5;
  color: var(--sand);
}

.page-about .about-note {
  margin: 1.5rem 0 0;
  padding: 1rem 1.15rem;
  max-width: var(--about-body-max);
  border: 1px dashed var(--line-dashed);
  border-radius: var(--radius-m);
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(1.6rem, 4vh, 2.4rem) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: linear-gradient(155deg, rgba(11, 79, 108, 0.55), rgba(22, 44, 51, 0.92));
}

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

.page-about .about-figure .media-caption {
  padding: 0.7rem 1rem 0.85rem;
  font-size: var(--step--1);
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.5rem, 3vh, 2.25rem) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4rem;
  bottom: 1.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--line-strong), rgba(139, 184, 196, 0.06));
}

.page-about .about-tl-item {
  position: relative;
  display: grid;
  row-gap: 0.3rem;
  padding: 0 0 2.15rem 1.6rem;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 0.55rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
}

.page-about .about-tl-year {
  font-family: var(--font-mono);
  font-size: var(--step-0);
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-tl-body h3 {
  margin: 0 0 0.4rem;
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.35;
  color: var(--card);
}

.page-about .about-tl-body p {
  margin: 0;
  max-width: 56ch;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .about-timeline::before {
    left: 8.5rem;
  }

  .page-about .about-tl-item {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    column-gap: 2.25rem;
    padding-left: 0;
    padding-bottom: 2.75rem;
    align-items: start;
  }

  .page-about .about-tl-item::before {
    left: calc(8.5rem - 4.5px);
    top: 0.6rem;
  }

  .page-about .about-tl-year {
    text-align: right;
    font-size: var(--step-1);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.25rem);
  margin-top: clamp(1.5rem, 3vh, 2.25rem);
  align-items: start;
}

.page-about .about-team-figure {
  margin-top: 0;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-roles > li {
  border-top: 1px solid var(--line);
}

.page-about .about-roles > li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-role > summary {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.95rem 0;
  cursor: pointer;
  list-style: none;
  font-size: var(--step-1);
  font-weight: 700;
  color: var(--card);
  transition: color var(--dur) var(--ease);
}

.page-about .about-role > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-role > summary:hover,
.page-about .about-role > summary:focus-visible {
  color: var(--cyan);
}

.page-about .about-role-name {
  min-width: 4.5em;
}

.page-about .about-role-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-role-plus {
  font-size: var(--step-0);
  line-height: 1;
  color: var(--mist);
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-role[open] .about-role-plus {
  transform: rotate(45deg);
  color: var(--terracotta);
}

.page-about .about-role > p {
  margin: 0;
  padding: 0 0 1.15rem;
  max-width: 46ch;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 880px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

/* ---------- 流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(1.5rem, 3vh, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-steps > li {
  padding: 1.1rem 1.15rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, rgba(11, 79, 108, 0.45), rgba(22, 44, 51, 0.9));
}

.page-about .about-step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 0.5rem;
}

.page-about .about-steps h3 {
  margin: 0 0 0.4rem;
  font-size: var(--step-0);
  font-weight: 700;
  color: var(--sand);
}

.page-about .about-steps p {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .about-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-steps > li {
    background: none;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 0.15rem 1.05rem 0;
  }

  .page-about .about-steps > li:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-steps > li:last-child {
    padding-right: 0;
  }
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  list-style: none;
  margin: clamp(1.5rem, 3vh, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.15rem;
}

.page-about .about-reach > li {
  border-top: 1px solid var(--line);
  padding-top: 0.9rem;
}

.page-about .about-reach-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-reach-label {
  display: block;
  margin-top: 0.3rem;
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--sand);
}

.page-about .about-reach p {
  margin: 0.5rem 0 0;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 620px) {
  .page-about .about-reach {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem 2rem;
  }
}

/* ---------- 荣誉 ---------- */
.page-about .about-honors-list {
  display: grid;
  gap: 0.9rem;
  margin: clamp(1.4rem, 3vh, 2rem) 0 0;
}

.page-about .about-honor {
  padding: 1.3rem 1.35rem 1.4rem;
  border: 1px dashed var(--line-dashed);
  border-radius: var(--radius-m);
  background: linear-gradient(150deg, rgba(29, 122, 158, 0.28), rgba(7, 26, 34, 0.65));
}

.page-about .about-honor .eyebrow {
  margin: 0 0 0.5rem;
  color: var(--terracotta);
  letter-spacing: 0.18em;
}

.page-about .about-honor h3 {
  margin: 0 0 0.5rem;
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.35;
  color: var(--sand);
}

.page-about .about-honor p:last-child {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-honor-figure {
  margin-top: clamp(1.5rem, 3vh, 2rem);
}

@media (min-width: 680px) {
  .page-about .about-honors-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 后续入口 ---------- */
.page-about .about-next-section {
  padding-bottom: clamp(2.5rem, 6vh, 4.5rem);
}

.page-about .about-next-heading {
  margin: 0 0 clamp(1.25rem, 3vh, 1.8rem);
  font-size: var(--step-2);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--sand);
  max-width: 20ch;
}

.page-about .about-next {
  display: grid;
  gap: 0.8rem;
}

.page-about .about-next a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "kicker title"
    "kicker desc";
  gap: 0.15rem 0.9rem;
  align-items: start;
  padding: 1.05rem 1.15rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(22, 44, 51, 0.6);
  color: inherit;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  border-color: var(--line-strong);
  background: rgba(11, 79, 108, 0.55);
  transform: translateY(-2px);
}

.page-about .about-next a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-next-kicker {
  grid-area: kicker;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding-top: 0.25rem;
}

.page-about .about-next-title {
  grid-area: title;
  font-size: var(--step-0);
  font-weight: 700;
  color: var(--card);
}

.page-about .about-next-desc {
  grid-area: desc;
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }
}

/* ---------- 桌面：左侧索引栏 + 右侧偏移正文 ---------- */
@media (min-width: 920px) {
  .page-about .about-row {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
    display: block;
  }

  .page-about .about-num {
    font-size: clamp(3rem, 4.4vw, 4rem);
    margin-bottom: 0.7rem;
  }

  .page-about .about-rail-label {
    display: block;
    line-height: 1.5;
  }

  .page-about .about-body {
    max-width: min(100%, 70ch);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next a,
  .page-about .about-role-plus,
  .page-about .about-role > summary {
    transition: none;
  }

  .page-about .about-next a:hover,
  .page-about .about-next a:focus-visible {
    transform: none;
  }
}