.page-about {
  display: block;
  overflow-x: clip;
  padding-bottom: clamp(24px, 5vw, 48px);
}

.page-about .about-wrap {
  width: min(1240px, calc(100% - var(--gut) * 2));
  margin-inline: auto;
}

/* ---------- 页面题头 ---------- */

.page-about .about-mast {
  padding-top: clamp(24px, 5vw, 54px);
  padding-bottom: clamp(30px, 5vw, 56px);
  text-align: center;
}

.page-about .about-mast .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: var(--fog);
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-mast .crumbs a {
  color: var(--fog);
  text-decoration: none;
  transition: color var(--t) var(--ease);
}

.page-about .about-mast .crumbs a:hover {
  color: var(--cyan);
}

.page-about .about-mast .crumbs__sep {
  color: var(--line);
}

.page-about .about-mast__kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-mast__title {
  margin: 0 0 clamp(18px, 3vw, 26px);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 5.6vw, 3.7rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-mast__lede {
  margin: 0 auto;
  max-width: 760px;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-mast__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(18px, 4vw, 56px);
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: clamp(20px, 3vw, 28px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-mast__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 116px;
}

.page-about .about-mast__num {
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-mast__lbl {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

/* ---------- 首屏横幅 ---------- */

.page-about .about-banner {
  position: relative;
  margin: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-banner .media-frame__img {
  display: block;
  width: 100%;
  height: clamp(200px, 40vw, 500px);
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-banner .media-frame__tag {
  position: absolute;
  top: 18px;
  left: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink);
  background: var(--cyan);
  padding: 4px 9px;
}

.page-about .about-banner .media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 40px clamp(18px, 4vw, 44px) 16px;
  font-size: 13px;
  color: var(--body);
  background: linear-gradient(180deg, rgba(7, 11, 22, 0) 0%, rgba(7, 11, 22, 0.88) 78%);
}

/* ---------- 两栏骨架 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-block: clamp(34px, 6vw, 72px) 0;
}

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

/* 侧边章节索引 */

.page-about .about-rail {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(28px, 5vw, 40px);
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dim);
}

.page-about .about-rail__list {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  list-style: none;
  margin: 0;
  padding: 0;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__list .index-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  color: var(--fog);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-about .about-rail__list a.is-active {
  color: var(--white);
  border-color: var(--red);
  background: rgba(228, 68, 47, 0.14);
}

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
}

@media (min-width: 940px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    column-gap: clamp(48px, 7vw, 104px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 118px;
    align-self: start;
    padding-bottom: 0;
    border-bottom: 0;
    margin-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-rail__list .index-rail__item {
    flex: none;
    width: 100%;
  }

  .page-about .about-rail__list a {
    display: flex;
    border: 0;
    border-left: 1px solid var(--line);
    padding: 10px 0 10px 16px;
    background: none;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-rail__list a.is-active {
    border-left-color: var(--red);
    background: none;
    color: var(--white);
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  position: relative;
  padding-top: clamp(30px, 5vw, 48px);
  border-top: 1px solid var(--line);
  margin-bottom: clamp(46px, 7vw, 84px);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-wm {
  position: absolute;
  top: clamp(18px, 3vw, 30px);
  right: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(3.2rem, 9vw, 6rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--line);
  opacity: 0.55;
  pointer-events: none;
  user-select: none;
}

.page-about .about-h2 {
  position: relative;
  margin: 0 0 14px;
  max-width: 24ch;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.26;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-lede {
  margin: 0 0 clamp(26px, 4vw, 40px);
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--body);
}

/* ---------- 01 我们相信 ---------- */

.page-about .about-creed__claim {
  padding: clamp(22px, 4vw, 38px);
  background: var(--paper);
  color: var(--ink);
  border-left: 3px solid var(--red);
  font-size: clamp(1.02rem, 1.9vw, 1.22rem);
  font-weight: 500;
  line-height: 1.85;
}

.page-about .about-creed__list {
  list-style: none;
  margin: clamp(22px, 3.5vw, 36px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
}

.page-about .about-creed__list li {
  background: var(--ink);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-creed__list h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-creed__list p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--body);
}

@media (min-width: 760px) {
  .page-about .about-creed__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 02 一路走来 ---------- */

.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__node {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 40px);
}

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

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--ink);
  transform: translateX(-50%);
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .about-timeline__node:hover::before,
.page-about .about-timeline__node:focus-within::before {
  border-color: var(--red);
  background: var(--red);
}

.page-about .about-timeline__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-timeline__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--gold);
  padding: 3px 8px;
}

.page-about .about-timeline__stage {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fog);
}

.page-about .about-timeline__node h3 {
  margin: 0 0 8px;
  font-size: clamp(1.02rem, 1.8vw, 1.14rem);
  font-weight: 700;
  color: var(--white);
}

.page-about .about-timeline__node p {
  margin: 0;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--body);
}

.page-about .about-timeline__more {
  margin-top: 10px;
  font-size: 0.9rem;
  color: var(--fog);
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .about-timeline__more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 320ms var(--ease), opacity 260ms var(--ease), margin-top 320ms var(--ease);
  }

  .page-about .about-timeline__node:hover .about-timeline__more,
  .page-about .about-timeline__node:focus-within .about-timeline__more {
    max-height: 220px;
    margin-top: 12px;
    opacity: 1;
  }
}

/* ---------- 03 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 0 0 22px;
  padding: 1px;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
}

.page-about .about-team__roles li {
  background: var(--ink-2);
  padding: 18px 16px;
}

.page-about .about-team__roles strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.45rem;
  color: var(--cyan);
}

.page-about .about-team__roles span {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fog);
}

.page-about .about-team__note {
  margin: 0 0 14px;
  font-size: 0.95rem;
  line-height: 1.82;
  color: var(--body);
}

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

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

.page-about .about-team__figure .media-frame__img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-team__figure .media-frame__caption {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fog);
}

@media (min-width: 560px) {
  .page-about .about-team__roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    column-gap: clamp(32px, 5vw, 56px);
  }
}

/* ---------- 04 服务标准 ---------- */

.page-about .about-standards {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-standards__row {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 3vw, 24px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-standards__key {
  font-family: var(--font-mono);
  font-size: clamp(0.98rem, 1.8vw, 1.1rem);
  color: var(--gold);
  letter-spacing: 0.01em;
}

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

@media (min-width: 760px) {
  .page-about .about-standards__row {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: baseline;
    gap: clamp(20px, 4vw, 48px);
  }
}

/* ---------- 05 安全 ---------- */

.page-about .about-security {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

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

.page-about .about-security__figure .media-frame__img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-security__text p {
  margin: 0 0 16px;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-security__link {
  margin-top: 24px;
}

@media (min-width: 880px) {
  .page-about .about-security {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
    align-items: center;
    column-gap: clamp(36px, 6vw, 64px);
  }
}

/* ---------- 06 合作与认可 ---------- */

.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(22px, 3vw, 30px);
}

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

.page-about .about-partners__item h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.5;
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--body);
}

.page-about .about-partners__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--cyan);
  letter-spacing: -0.02em;
}

@media (min-width: 780px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(24px, 4vw, 40px);
  }
}

/* ---------- 07 接下来的路 ---------- */

.page-about .about-next {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(26px, 4vw, 44px);
}

.page-about .about-next .about-h2--dark {
  margin: 0 0 14px;
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.28;
  letter-spacing: -0.02em;
}

.page-about .about-next__lede {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.85;
  color: #2C3550;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-top: 1px solid rgba(7, 11, 22, 0.22);
}

.page-about .about-next__list li {
  padding-top: 16px;
  border-top: 1px solid rgba(7, 11, 22, 0.14);
}

.page-about .about-next__list li:first-child {
  border-top: 0;
}

.page-about .about-next__list h3 {
  margin: 0 0 8px;
  font-size: 0.98rem;
  font-weight: 700;
  color: #12193A;
}

.page-about .about-next__list p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: #2C3550;
}

@media (min-width: 780px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 32px);
    border-top: 0;
  }

  .page-about .about-next__list li {
    border-top: 1px solid rgba(7, 11, 22, 0.22);
  }
}

/* ---------- 收束语 ---------- */

.page-about .about-coda {
  margin: 0 0 clamp(24px, 4vw, 44px);
  padding-top: clamp(34px, 6vw, 64px);
  border-top: 1px solid var(--line);
  text-align: center;
}

.page-about .about-coda p {
  margin: 0 auto;
  max-width: 640px;
  font-size: clamp(1.05rem, 2.2vw, 1.45rem);
  font-weight: 600;
  line-height: 1.8;
  color: var(--white);
}

.page-about .about-coda__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: clamp(24px, 3.5vw, 34px);
}

/* ---------- 窄屏兜底 ---------- */

@media (max-width: 480px) {
  .page-about .about-wm {
    font-size: 2.6rem;
    opacity: 0.45;
  }

  .page-about .about-mast__facts {
    gap: 16px 28px;
  }

  .page-about .about-mast__facts li {
    min-width: 92px;
  }

  .page-about .about-banner .media-frame__caption {
    position: static;
    padding: 14px 0;
    background: none;
    border-top: 1px solid var(--line);
  }

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