.page-about {
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: 18px;
  padding-bottom: 6px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(14px, 3vw, 26px) 0 clamp(34px, 6vw, 72px);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 44px);
  padding: clamp(22px, 4vw, 46px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(44, 232, 196, 0.14) 0%, rgba(15, 58, 49, 0) 58%),
    linear-gradient(158deg, var(--mist) 0%, var(--band) 52%, var(--ink) 100%);
}

.page-about .about-hero__inner::before,
.page-about .about-hero__inner::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border-style: solid;
  border-color: var(--cyan);
  pointer-events: none;
}

.page-about .about-hero__inner::before {
  top: 13px;
  left: 13px;
  border-width: 1px 0 0 1px;
}

.page-about .about-hero__inner::after {
  right: 13px;
  bottom: 13px;
  border-width: 0 1px 1px 0;
}

.page-about .about-hero__copy {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 4px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px dashed var(--line);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-hero__facts .num {
  font-family: var(--font-num);
  font-feature-settings: "tnum";
  font-size: 24px;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--lift);
}

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

.page-about .about-hero__figure .media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-hi);
  background: linear-gradient(to top, rgba(6, 19, 16, 0.92), rgba(6, 19, 16, 0));
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 0 var(--gutter) 10px;
  scrollbar-width: thin;
}

.page-about .about-index__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--lift);
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-index__item .num {
  font-family: var(--font-num);
  font-feature-settings: "tnum";
  color: var(--cyan);
  font-size: 12px;
}

.page-about .about-index__item:hover,
.page-about .about-index__item:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-long {
  display: block;
}

.page-about .about-chapter {
  padding: clamp(40px, 8vw, 86px) 0;
  border-top: 1px solid rgba(29, 59, 50, 0.6);
}

.page-about .about-chapter--band {
  background: linear-gradient(180deg, var(--band) 0%, rgba(10, 30, 25, 0.4) 100%);
}

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

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-chapter__no {
  font-family: var(--font-num);
  font-feature-settings: "tnum";
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--cyan);
}

.page-about .about-chapter__note {
  font-size: 11.5px;
  letter-spacing: 0.3em;
  color: var(--muted);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter__body {
  min-width: 0;
  max-width: 76ch;
}

.page-about .about-chapter__body h2 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 4.2vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-chapter__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--text);
}

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

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

.page-about .about-chapter__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 232, 196, 0.4);
}

.page-about .about-chapter__body a:hover,
.page-about .about-chapter__body a:focus-visible {
  color: var(--cyan-hi);
  border-bottom-color: var(--cyan-hi);
}

/* ---------- 设计主张 ---------- */
.page-about .about-principles {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: principle;
  display: grid;
  gap: 14px;
}

.page-about .about-principles li {
  position: relative;
  padding: 18px 18px 18px 62px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--lift);
  counter-increment: principle;
}

.page-about .about-principles li::before {
  content: counter(principle, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 17px;
  font-family: var(--font-num);
  font-feature-settings: "tnum";
  font-size: 17px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-principles li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 团队四象限 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-role {
  position: relative;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--lift);
  transition: border-color 200ms var(--ease), background 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-role::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 240ms var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-visible,
.page-about .about-role:focus-within {
  border-color: var(--cyan);
  background: #14322a;
  outline: none;
}

.page-about .about-role:hover::after,
.page-about .about-role:focus-visible::after,
.page-about .about-role:focus-within::after {
  transform: scaleX(1);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-roles__media {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.page-about .about-roles__figure {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--lift);
}

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

.page-about .about-roles__figure .media-frame__label {
  display: block;
  padding: 9px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .about-roles__caption {
  margin: 0;
  padding: 12px 14px;
  border-left: 2px solid var(--cyan);
  border-radius: 0 12px 12px 0;
  background: rgba(44, 232, 196, 0.06);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 版本长卷 ---------- */
.page-about .about-version-figure {
  margin: 20px 0 22px;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--lift);
}

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

.page-about .about-version-figure .media-frame__label {
  display: block;
  padding: 9px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .about-versions {
  position: relative;
  margin-top: 8px;
  padding-top: 26px;
}

.page-about .about-versions::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  right: 0;
  height: 1px;
  background: repeating-linear-gradient(
    to right,
    var(--line) 0 14px,
    transparent 14px 24px
  );
}

.page-about .about-versions__scale {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 82%);
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 12px;
  scrollbar-width: thin;
}

.page-about .about-ver {
  position: relative;
  scroll-snap-align: start;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--lift);
}

.page-about .about-ver::before {
  content: "";
  position: absolute;
  top: -20px;
  left: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(44, 232, 196, 0.14);
}

.page-about .about-ver__tag {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-feature-settings: "tnum";
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

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

.page-about .about-version-more {
  margin-top: 16px;
  font-size: 14px;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-partner {
  position: relative;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: 0 20px 20px 20px;
  background: var(--lift);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-partner__tag {
  display: inline-block;
  margin: 0 0 10px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(44, 232, 196, 0.12);
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 服务准则 ---------- */
.page-about .about-service {
  margin: 20px 0 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-service dt {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15.5px;
  color: var(--text);
}

.page-about .about-service dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 5vw, 44px);
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background:
    radial-gradient(100% 120% at 100% 0%, rgba(255, 122, 45, 0.14) 0%, rgba(6, 19, 16, 0) 62%),
    linear-gradient(140deg, var(--lift) 0%, var(--band) 100%);
}

.page-about .about-cta h2 {
  margin: 0 0 8px;
  font-size: clamp(20px, 3.6vw, 26px);
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 14.5px;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .about-roles__media {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

  .page-about .about-service__row {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: stretch;
  }

  .page-about .about-chapter__inner {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: calc(var(--header-h-sm) + 24px);
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 6px;
  }

  .page-about .about-chapter__note {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.32em;
    border-bottom: 0;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
    padding-left: 10px;
  }

  .page-about .about-versions__scale {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow-x: visible;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-role::after,
  .page-about .about-index__item {
    transition: none;
  }
}