.page-about {
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--paper);
  background:
    radial-gradient(120% 90% at 88% -14%, rgba(58, 45, 92, 0.95) 0%, rgba(25, 27, 56, 0) 62%),
    linear-gradient(158deg, #14162e 0%, #221f45 46%, #14483a 100%);
  padding: clamp(14px, 3vw, 28px) 0 clamp(38px, 6vw, 74px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: -12%;
  width: 58%;
  height: 100%;
  background: repeating-linear-gradient(
    100deg,
    rgba(240, 90, 50, 0.16) 0 2px,
    rgba(240, 90, 50, 0) 2px 26px
  );
  transform: skewX(-12deg);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(18px, 3.4vw, 34px);
}

.page-about .about-hero .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(244, 239, 226, 0.6);
}

.page-about .about-hero .breadcrumb a {
  color: rgba(244, 239, 226, 0.88);
  text-decoration: none;
  border-bottom: 1px solid rgba(244, 239, 226, 0.3);
}

.page-about .about-hero .breadcrumb a:hover {
  border-bottom-color: var(--speed);
}

.page-about .about-hero .eyebrow {
  color: var(--speed);
  margin-bottom: clamp(10px, 2vw, 18px);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(38px, 9vw, 92px);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -0.01em;
  transform: skewX(-6deg);
  transform-origin: left bottom;
  padding-left: 2px;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 30px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: rgba(244, 239, 226, 0.84);
}

.page-about .about-hero__facts {
  margin: clamp(26px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(244, 239, 226, 0.16);
  border: 1px solid rgba(244, 239, 226, 0.16);
}

.page-about .about-hero__fact {
  background: rgba(18, 20, 42, 0.62);
  padding: 14px 16px 16px;
}

.page-about .about-hero__fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--speed);
  line-height: 1.1;
}

.page-about .about-hero__fact-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(244, 239, 226, 0.72);
}

/* ---------- 躯体：章节轨 + 内容流 ---------- */
.page-about .about-body {
  padding: clamp(26px, 5vw, 70px) 0 clamp(40px, 7vw, 96px);
}

.page-about .about-body__inner {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--moss);
  color: var(--paper);
  border-color: var(--moss);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--flame);
}

.page-about .about-rail__link:hover .about-rail__num {
  color: var(--speed);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(30px, 5vw, 60px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(4px, 2vw, 12px);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(10px, 2vw, 18px);
  margin-bottom: clamp(16px, 2.6vw, 28px);
}

.page-about .about-chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(32px, 6.4vw, 62px);
  line-height: 0.86;
  letter-spacing: 0.02em;
  color: rgba(25, 27, 56, 0.16);
  -webkit-text-stroke: 1px rgba(14, 124, 102, 0.42);
}

.page-about .about-chapter__title {
  margin: 0;
  padding-bottom: 6px;
  font-size: clamp(21px, 3.2vw, 32px);
  font-weight: 800;
  line-height: 1.3;
  position: relative;
}

.page-about .about-chapter__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 44px;
  height: 3px;
  background: var(--flame);
  transform: skewX(-20deg);
}

.page-about .about-text,
.page-about .about-chapter__body p {
  margin: 0 0 0.9em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-chapter__body--narrow {
  max-width: 68ch;
}

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

.page-about .about-chapter a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 124, 102, 0.4);
}

.page-about .about-chapter a:hover {
  color: var(--flame);
  border-bottom-color: var(--flame);
}

.page-about .about-callout {
  margin: clamp(16px, 2.6vw, 26px) 0;
  padding: 16px 18px;
  border-left: 3px solid var(--flame);
  background: var(--paper-3);
  font-size: 15px;
  line-height: 1.85;
  color: var(--moss);
}

.page-about .about-callout strong {
  color: var(--ink);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 34px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-about .about-figure--diag img {
  clip-path: polygon(0 3%, 100% 0, 100% 97%, 0 100%);
}

.page-about .about-figure .media__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 认证五关 ---------- */
.page-about .about-checks {
  list-style: none;
  margin: clamp(16px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .about-checks__item {
  background: var(--paper-3);
  padding: clamp(14px, 2.2vw, 22px);
  transition: background 0.22s ease, transform 0.22s ease;
}

.page-about .about-checks__item:hover {
  background: #fffdf5;
  transform: translate(-2px, -4px);
}

.page-about .about-checks__no {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--flame);
}

.page-about .about-checks__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-checks__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-checks__foot {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(20px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 30px) clamp(20px, 3vw, 30px);
  border-left: 2px solid var(--line);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--green);
}

.page-about .about-timeline__item:last-child::before {
  border-color: var(--flame);
  background: var(--flame);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--moss);
  line-height: 1.2;
}

.page-about .about-timeline__title {
  margin: 4px 0 6px;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  line-height: 1.45;
}

.page-about .about-timeline__item > p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-timeline__details {
  margin-top: 10px;
  max-width: 62ch;
  border: 1px solid var(--line);
  background: var(--paper-3);
  border-radius: var(--radius);
}

.page-about .about-timeline__details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 12px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--moss);
  list-style: none;
}

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

.page-about .about-timeline__details summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--flame);
}

.page-about .about-timeline__details[open] summary::after {
  content: "—";
}

.page-about .about-timeline__details p {
  margin: 0;
  padding: 0 12px 12px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  margin-top: clamp(6px, 2vw, 14px);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-about .about-role {
  padding-top: 10px;
  border-top: 2px solid var(--green);
}

.page-about .about-role:nth-child(2) {
  border-top-color: var(--flame);
}

.page-about .about-role:nth-child(3) {
  border-top-color: var(--clay);
}

.page-about .about-role:nth-child(4) {
  border-top-color: var(--ink);
}

.page-about .about-role__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .about-role__name {
  margin: 4px 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-callout--wide {
  margin-top: clamp(18px, 3vw, 28px);
  background: linear-gradient(100deg, rgba(14, 124, 102, 0.1), rgba(240, 90, 50, 0.06));
  border-left-color: var(--green);
  color: var(--ink);
}

/* ---------- 区域 ---------- */
.page-about .about-region {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-cities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cities li {
  padding: 5px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--moss);
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
}

.page-about .about-cities li:nth-child(3n + 2) {
  border-left-color: var(--flame);
}

.page-about .about-cities li:nth-child(3n + 3) {
  border-left-color: var(--clay);
}

.page-about .about-region__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-region__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-region__num em {
  font-style: normal;
  font-size: 0.5em;
  color: var(--stone);
  margin-left: 2px;
}

.page-about .about-region__cap {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .about-figure--region {
  margin: 0;
}

/* ---------- 合作价值 ---------- */
.page-about .about-why {
  display: grid;
  gap: 1px;
  margin-top: clamp(16px, 2.6vw, 26px);
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .about-why__item {
  background: var(--paper-3);
  padding: clamp(16px, 2.4vw, 26px);
}

.page-about .about-why__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--flame);
}

.page-about .about-why__t {
  margin: 6px 0 8px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
}

.page-about .about-why__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(24px, 4vw, 48px);
  border-radius: var(--radius);
  color: var(--paper);
  background: linear-gradient(118deg, var(--moss) 0%, var(--ink) 68%, var(--night) 100%);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -70%;
  width: 62%;
  height: 200%;
  background: linear-gradient(90deg, rgba(240, 90, 50, 0.42), rgba(242, 193, 78, 0));
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .about-cta h2 {
  position: relative;
  z-index: 1;
  margin: 0 0 12px;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 900;
  line-height: 1.28;
  transform: skewX(-4deg);
  transform-origin: left bottom;
}

.page-about .about-cta p {
  position: relative;
  z-index: 1;
  margin: 0 0 20px;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 239, 226, 0.84);
}

.page-about .about-cta__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-roles,
  .page-about .about-why {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

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

  .page-about .about-checks__item:last-child {
    grid-column: 1 / -1;
  }

  .page-about .about-hero__lede {
    margin-left: auto;
    max-width: 50ch;
  }
}

@media (min-width: 900px) {
  .page-about .about-region {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-body__inner {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

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

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

  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    padding: 8px 0 8px 14px;
    margin-left: -1px;
    font-size: 13.5px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
    color: var(--ink);
    border-left-color: var(--flame);
  }

  .page-about .about-rail__link:hover .about-rail__num {
    color: var(--flame);
  }

  .page-about .about-chapter__body--narrow {
    max-width: 66ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-checks__item,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-checks__item:hover {
    transform: none;
  }

  .page-about .about-hero__title,
  .page-about .about-cta h2 {
    transform: none;
  }
}