.page-about {
  --about-rail: 146px;
  --about-gap: 28px;
  --about-line-light: rgba(247, 243, 236, 0.18);
  --about-line-dark: rgba(11, 21, 38, 0.14);
}

.page-about > section {
  padding-top: 60px;
  padding-bottom: 60px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-hero__crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-300);
  margin-bottom: 30px;
}

.page-about .about-hero__crumb a {
  color: rgba(247, 243, 236, 0.6);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--orange);
}

.page-about .about-hero__crumb .crumb__sep {
  opacity: 0.5;
}

.page-about .about-hero__crumb [aria-current] {
  color: var(--orange);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(120% 82% at 12% 0%, rgba(58, 157, 143, 0.16) 0%, transparent 62%),
    radial-gradient(90% 70% at 92% 108%, rgba(242, 140, 56, 0.14) 0%, transparent 60%);
}

.page-about .about-hero__split {
  position: relative;
  display: grid;
  gap: 34px;
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(30px, 7.2vw, 52px);
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--paper);
  margin: 14px 0 22px;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--orange);
  border-bottom: 3px solid rgba(242, 140, 56, 0.36);
  padding-bottom: 2px;
}

.page-about .about-hero__lead {
  color: rgba(247, 243, 236, 0.86);
  max-width: 46ch;
  line-height: 1.85;
}

.page-about .about-hero__note {
  margin-top: 18px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-300);
}

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

.page-about .about-hero__figure img,
.page-about .about-history__banner img,
.page-about .about-team__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-hero__stats {
  position: relative;
  list-style: none;
  padding: 28px 0 0;
  margin: 42px 0 0;
  display: grid;
  gap: 22px;
  border-top: 1px solid var(--about-line-light);
}

.page-about .about-hero__stats li {
  display: grid;
  gap: 6px;
  color: rgba(247, 243, 236, 0.7);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-hero__stats .num {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 30px;
  letter-spacing: -0.02em;
  color: var(--paper);
}

/* ---------- 通用非对称分栏 ---------- */
.page-about .about-block {
  display: grid;
  gap: 26px;
}

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

.page-about .about-block__main > p {
  max-width: 64ch;
  margin: 0 0 18px;
  color: var(--ink-600);
  line-height: 1.88;
}

.page-about .about-block__main > h2 {
  margin-bottom: 22px;
}

.page-about .about-block__lead {
  color: var(--ink-600);
  margin-bottom: 24px;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding-top: 4px;
}

.page-about .about-rail__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-rail__label {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-800);
  padding-left: 12px;
  border-left: 2px solid var(--orange);
}

/* ---------- 我们从哪里来 ---------- */
.page-about .about-drop {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 18px;
  line-height: 1.85;
  letter-spacing: 0.012em;
  color: var(--ink-800);
  margin-bottom: 22px;
  max-width: 62ch;
}

.page-about .about-quote {
  margin: 34px 0 0;
  max-width: 58ch;
  padding: 20px 22px;
  background: var(--white);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.82;
  color: var(--ink-800);
  box-shadow: var(--shadow-1);
}

/* ---------- 今天在做什么 ---------- */
.page-about .about-lane {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-lane__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .about-lane__head h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.42;
  color: var(--ink-800);
}

.page-about .about-lane p {
  max-width: 64ch;
  margin: 0;
  color: var(--ink-600);
  line-height: 1.88;
}

/* ---------- 内容方法论 ---------- */
.page-about .about-method__head {
  max-width: 62ch;
  margin-bottom: 44px;
}

.page-about .about-method__head .section-head__title {
  color: var(--paper);
  margin: 14px 0 18px;
}

.page-about .about-method__lead {
  color: rgba(247, 243, 236, 0.78);
  line-height: 1.85;
}

.page-about .about-method__list {
  display: grid;
  gap: 20px;
}

.page-about .about-method__card {
  padding: 26px 24px 28px;
  color: var(--paper);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-method__card:hover,
.page-about .about-method__card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(242, 140, 56, 0.5);
}

.page-about .about-method__card h3 {
  margin: 14px 0 10px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-method__card p {
  margin: 0;
  color: rgba(247, 243, 236, 0.78);
  font-size: 15px;
  line-height: 1.86;
}

.page-about .about-method__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-flow {
  margin-top: 54px;
  padding-top: 32px;
  border-top: 1px solid var(--about-line-light);
}

.page-about .about-flow > .eyebrow {
  display: block;
  margin-bottom: 24px;
  color: rgba(247, 243, 236, 0.62);
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-flow__steps .step-path__item {
  position: relative;
  padding: 18px 18px 20px 60px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--about-line-light);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-flow__steps .step-path__item:hover {
  border-color: rgba(58, 157, 143, 0.55);
  background: rgba(255, 255, 255, 0.08);
}

.page-about .about-flow__steps .step-path__num {
  position: absolute;
  left: 18px;
  top: 19px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--green);
  color: var(--ink-900);
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-flow__steps h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-flow__steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(247, 243, 236, 0.72);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__banner {
  margin: 0 0 48px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: 34px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 7px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px rgba(58, 157, 143, 0.42);
  z-index: 1;
  transition: box-shadow var(--dur) var(--ease);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 11px;
  top: 24px;
  bottom: -4px;
  width: 1px;
  background: rgba(58, 157, 143, 0.38);
}

.page-about .about-timeline__item:hover::before {
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 7px rgba(58, 157, 143, 0.28);
}

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

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

.page-about .about-timeline__item--now::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px rgba(242, 140, 56, 0.45);
}

.page-about .about-timeline__item--now:hover::before {
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 7px rgba(242, 140, 56, 0.3);
}

.page-about .about-timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--green-ink);
}

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

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink-800);
}

.page-about .about-timeline__desc {
  margin: 0;
  max-width: 60ch;
  color: var(--ink-600);
  line-height: 1.84;
  transition: color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__desc {
  color: var(--ink-800);
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 28px;
  margin: 30px 0 28px;
}

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

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

.page-about .about-roster__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-roster__row:first-child {
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-roster__row dt {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink-800);
  line-height: 1.4;
}

.page-about .about-roster__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-600);
}

.page-about .about-roster__row .num,
.page-about .about-team__note .num {
  font-family: var(--font-num);
  font-weight: 700;
  color: var(--orange-ink);
}

.page-about .about-team__note {
  max-width: 64ch;
  margin: 0 0 16px;
  color: var(--ink-600);
  line-height: 1.88;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-coverage__head {
  max-width: 62ch;
  margin-bottom: 40px;
}

.page-about .about-coverage__head .section-head__title {
  color: var(--paper);
  margin: 14px 0 18px;
}

.page-about .about-coverage__lead {
  color: rgba(247, 243, 236, 0.78);
  line-height: 1.85;
}

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

.page-about .about-coverage__item {
  padding: 24px 22px 26px;
  color: var(--paper);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-coverage__item:hover {
  transform: translateY(-4px);
  border-color: rgba(242, 140, 56, 0.45);
}

.page-about .about-coverage__item .num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 32px;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-coverage__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-coverage__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 243, 236, 0.74);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin: 28px 0 18px;
}

.page-about .about-next__contact {
  max-width: 62ch;
  margin: 14px 0 0;
  color: var(--ink-600);
  line-height: 1.88;
}

.page-about .about-next__mail {
  font-family: var(--font-num);
  font-weight: 600;
  color: var(--ink-800);
  border-bottom: 1px solid var(--orange);
  padding-bottom: 1px;
}

/* ---------- 显现（渐进增强） ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

html[data-js] .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

html[data-js] .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 560px) {
  .page-about > section {
    padding-top: 46px;
    padding-bottom: 46px;
  }

  .page-about .about-hero__title {
    font-size: 30px;
    line-height: 1.26;
  }

  .page-about .about-hero__stats .num {
    font-size: 26px;
  }

  .page-about .about-drop {
    font-size: 17px;
  }

  .page-about .about-method__card {
    padding: 22px 18px 24px;
  }

  .page-about .about-flow__steps .step-path__item {
    padding: 18px 16px 20px 54px;
  }

  .page-about .about-coverage__item .num {
    font-size: 28px;
  }
}

/* ---------- 中屏：非对称分栏与错落 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__split {
    grid-template-columns: 7fr 5fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .about-method__list {
    max-width: 880px;
  }

  .page-about .about-method__card:nth-child(2) {
    margin-left: 42px;
  }

  .page-about .about-method__card:nth-child(3) {
    margin-left: 84px;
  }

  .page-about .about-flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-roster__row {
    grid-template-columns: 138px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

/* ---------- 桌面：框架式非对称骨架 ---------- */
@media (min-width: 980px) {
  .page-about > section {
    padding-top: 78px;
    padding-bottom: 78px;
  }

  .page-about .about-block {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 50px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 5fr 6fr;
    align-items: start;
    gap: 42px;
  }

  .page-about .about-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-flow__steps .step-path__item {
    padding: 46px 18px 22px;
  }

  .page-about .about-flow__steps .step-path__num {
    top: 16px;
  }

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

  .page-about .about-coverage__item:nth-child(even) {
    margin-top: 22px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__split {
    gap: 66px;
  }

  .page-about .about-history__banner {
    margin-bottom: 58px;
  }
}