.page-about {
  --about-gap: clamp(64px, 10vw, 128px);
  background: var(--deep);
  color: var(--paper);
}

/* ---------- HERO ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  padding-block: calc(var(--topbar-h) + clamp(32px, 6vw, 64px)) clamp(48px, 8vw, 96px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 72% 18%, rgba(201, 162, 39, 0.13), transparent 58%),
    radial-gradient(ellipse at 12% 88%, rgba(22, 59, 47, 0.55), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "365";
  position: absolute;
  right: -2vw;
  bottom: -8vw;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(120px, 26vw, 320px);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: var(--gold);
  opacity: 0.06;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
  margin-bottom: 36px;
}

.page-about .breadcrumb__item {
  color: var(--stone);
  text-decoration: none;
  position: relative;
}

.page-about .breadcrumb a.breadcrumb__item::after {
  content: "/";
  margin-left: 8px;
  color: var(--line);
}

.page-about .breadcrumb a.breadcrumb__item:hover {
  color: var(--gold-2);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 5.4vw, 66px);
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--paper);
  margin: 22px 0 26px;
  max-width: 17ch;
}

.page-about .about-hero__lead {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: var(--paper);
  opacity: 0.8;
  max-width: 64ch;
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px 24px;
  list-style: none;
  margin: 44px 0 0;
  padding: 30px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-fact__num {
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-2);
}

.page-about .about-fact__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

/* ---------- SHELL 布局 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-block: clamp(48px, 8vw, 88px) clamp(64px, 10vw, 120px);
}

.page-about .about-aside {
  position: relative;
}

.page-about .about-aside__cap {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--stone);
  margin: 0 0 14px;
}

.page-about .about-toc__list {
  display: flex;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  overflow-x: auto;
  scrollbar-width: none;
  position: relative;
}

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

.page-about .about-toc__list::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 14px;
  bottom: 24px;
  width: 1px;
  background: var(--line);
  display: none;
}

.page-about .about-toc__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px 10px 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms linear;
}

.page-about .about-toc__no {
  font-size: 11px;
  color: var(--gold);
  opacity: 0.66;
  min-width: 22px;
  transition: opacity 160ms linear;
}

.page-about .about-toc__link:hover {
  color: var(--paper);
}

.page-about .about-toc__link.is-active {
  color: var(--gold-2);
}

.page-about .about-toc__link.is-active .about-toc__no {
  opacity: 1;
}

/* ---------- 章节 ---------- */
.page-about .about-stage {
  padding-block: clamp(36px, 6vw, 66px);
  border-bottom: 1px solid var(--line-soft);
}

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

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

.page-about .about-stage__no {
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .about-stage__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.22;
  letter-spacing: 0.02em;
  color: var(--paper);
  margin: 0 0 24px;
}

.page-about .about-stage__lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--paper);
  opacity: 0.8;
  max-width: 66ch;
  margin: 0 0 28px;
}

.page-about .about-stage__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about .about-stage__text p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--paper);
  opacity: 0.82;
  margin: 0 0 16px;
}

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

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

.page-about .about-stage__media .media__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 2px;
}

.page-about .about-stage__media--square .media__frame {
  aspect-ratio: 1 / 1;
}

.page-about .about-stage__media .media__img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.page-about .about-stage__media .media__caption {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 12 格矩阵 ---------- */
.page-about .about-matrix {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-matrix__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 132px;
  padding: 20px 16px 22px;
  background: var(--deep);
  transition: background 200ms linear, box-shadow 200ms linear;
}

.page-about .about-matrix__cell.is-pc {
  background: var(--grid);
  box-shadow: inset 0 0 0 1px var(--gold);
}

.page-about .about-matrix__cell:hover {
  background: var(--grid);
}

.page-about .about-matrix__cell.is-pc:hover {
  background: var(--deep);
  box-shadow: inset 0 0 0 1px var(--gold-2);
}

.page-about .about-matrix__no {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
  opacity: 0.7;
}

.page-about .about-matrix__name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-matrix__desc {
  margin-top: auto;
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--stone);
  opacity: 0.7;
  transition: opacity 200ms linear, color 200ms linear;
}

.page-about .about-matrix__cell:hover .about-matrix__desc,
.page-about .about-matrix__cell.is-pc .about-matrix__desc {
  opacity: 1;
  color: var(--paper);
}

.page-about .about-matrix__legend {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .about-matrix__legend::before {
  content: "";
  flex: none;
  width: 18px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 术语卡片带 ---------- */
.page-about .about-terms {
  margin-top: 36px;
}

.page-about .about-terms__hint {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
  margin: 0 0 14px;
}

.page-about .about-terms__scroll {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 4px 2px 18px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-about .about-terms__scroll::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-terms__scroll::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 3px;
}

.page-about .about-terms__card {
  flex: 0 0 218px;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 142px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-radius: 2px;
}

.page-about .about-terms__card-no {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
  opacity: 0.7;
}

.page-about .about-terms__card-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-terms__card-desc {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 8px;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-team__card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 140px;
  padding: 22px 18px;
  background: var(--deep);
}

.page-about .about-team__num {
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-2);
}

.page-about .about-team__role {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-team__desc {
  margin: 4px 0 0;
  font-size: 12.5px;
  line-height: 1.66;
  color: var(--stone);
}

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

.page-about .about-team__media .media__frame {
  aspect-ratio: 10 / 7;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 2px;
}

.page-about .about-team__media .media__img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.page-about .about-team__media .media__caption {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-team__proof {
  margin: 26px 0 0;
  padding-left: 18px;
  border-left: 1px solid var(--gold);
  font-size: 14px;
  line-height: 1.85;
  color: var(--paper);
  opacity: 0.82;
}

/* ---------- 版本节奏（米白面板） ---------- */
.page-about .about-stage--rhythm {
  padding-block: clamp(32px, 5vw, 56px);
}

.page-about .about-rhythm {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(26px, 5vw, 52px);
  border-radius: 2px;
}

.page-about .about-rhythm__no {
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--red);
  margin: 0 0 10px;
}

.page-about .about-rhythm__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.22;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0 0 18px;
}

.page-about .about-rhythm__lead {
  font-size: 15px;
  line-height: 1.85;
  color: var(--deep);
  max-width: 66ch;
  margin: 0 0 30px;
}

.page-about .about-rhythm__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: rgba(7, 17, 13, 0.16);
  border: 1px solid rgba(7, 17, 13, 0.16);
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
}

.page-about .about-rhythm__grid li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 18px;
  background: var(--paper);
}

.page-about .about-rhythm__num {
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--deep);
}

.page-about .about-rhythm__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.5;
  color: var(--deep);
  opacity: 0.66;
}

.page-about .about-rhythm__note {
  font-size: 14px;
  line-height: 1.85;
  color: var(--deep);
  margin: 0;
  padding-top: 22px;
  border-top: 1px solid rgba(7, 17, 13, 0.16);
}

.page-about .about-rhythm__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-reach__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 20px;
  background: var(--deep);
}

.page-about .about-reach__num {
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-2);
}

.page-about .about-reach__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper);
  opacity: 0.76;
}

.page-about .about-contacts {
  margin-top: 24px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  background: var(--glass);
  font-size: 14px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-contacts p {
  margin: 0 0 10px;
}

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

.page-about .about-contacts__mono {
  color: var(--gold-2);
  word-break: break-all;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .about-stage__split {
    grid-template-columns: 1.15fr 1fr;
    gap: clamp(28px, 5vw, 56px);
  }

  .page-about .about-stage__split--flip {
    grid-template-columns: 1fr 1.15fr;
  }

  .page-about .about-stage__split--flip .about-stage__media {
    order: -1;
  }

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

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

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

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: 1.35fr 1fr;
    align-items: stretch;
    gap: 20px;
  }

  .page-about .about-team__media {
    display: flex;
    flex-direction: column;
  }

  .page-about .about-team__media .media__frame {
    flex: 1;
    min-height: 100%;
    aspect-ratio: auto;
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    padding-block: clamp(56px, 8vw, 96px) clamp(80px, 10vw, 128px);
  }

  .page-about .about-aside {
    position: sticky;
    top: calc(var(--topbar-h) + 36px);
    align-self: start;
  }

  .page-about .about-aside__cap {
    margin-bottom: 18px;
    padding-left: 14px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-toc__list::before {
    display: block;
  }

  .page-about .about-toc__link {
    position: relative;
    padding: 11px 0 11px 30px;
    white-space: normal;
    font-size: 12px;
  }

  .page-about .about-toc__link::before {
    content: "";
    position: absolute;
    left: 11px;
    top: 50%;
    width: 7px;
    height: 7px;
    margin-top: -3.5px;
    border-radius: 50%;
    background: var(--deep);
    border: 1px solid var(--line);
    transition: background 160ms linear, border-color 160ms linear;
  }

  .page-about .about-toc__link.is-active::before {
    background: var(--gold);
    border-color: var(--gold);
  }

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

@media (min-width: 1180px) {
  .page-about .about-shell {
    grid-template-columns: 232px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-matrix__cell,
  .page-about .about-matrix__desc,
  .page-about .about-toc__link,
  .page-about .about-toc__link::before {
    transition: none;
  }
}