.page-about {
  --ab-gutter: clamp(18px, 4.6vw, 60px);
  --ab-max: 1240px;
  --ab-line: rgba(110, 90, 30, .34);
  --ab-grid: rgba(28, 41, 66, .9);
  --ab-panel: rgba(17, 26, 46, .78);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: min(86vh, 720px);
  padding: calc(var(--header-h) + 68px) var(--ab-gutter) clamp(38px, 6vw, 68px);
  overflow: hidden;
  border-bottom: var(--edge);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
  filter: saturate(.5) contrast(1.04);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 16, 32, .6) 0%, rgba(10, 16, 32, .86) 48%, var(--ink) 100%),
    radial-gradient(120% 90% at 84% 10%, rgba(201, 162, 39, .16), transparent 62%),
    radial-gradient(90% 70% at 6% 90%, rgba(47, 138, 116, .14), transparent 60%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--ab-max);
  margin: 0 auto;
}

.page-about .about-hero__kicker {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--jade);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(2rem, 6.6vw, 4.4rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__title-sub {
  display: block;
  margin-top: .55em;
  font-size: .33em;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--ink-soft);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 24px 0 0;
  font-size: clamp(.98rem, 1.3vw, 1.06rem);
  line-height: 1.95;
  color: var(--ink-soft);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  background: var(--ab-line);
  border: var(--edge);
}

.page-about .about-facts__item {
  padding: 15px 18px;
  background: var(--ab-panel);
}

.page-about .about-facts__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-facts__v {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--gold);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding: clamp(46px, 7vw, 88px) var(--ab-gutter) clamp(56px, 8vw, 104px);
}

.page-about .about-body__inner {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  max-width: var(--ab-max);
  margin: 0 auto;
}

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

/* ---------- 目录 ---------- */
.page-about .about-toc {
  border-top: var(--edge);
  padding-top: 14px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-toc .toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-toc .toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius);
  font-size: .84rem;
  line-height: 1.5;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  transition: color .22s ease, border-color .22s ease, background-color .22s ease;
}

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

.page-about .about-toc .toc__link[aria-current="true"] {
  color: var(--gold);
  border-color: var(--gold-soft);
  background: rgba(201, 162, 39, .08);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--hair);
}

.page-about .about-toc .toc__link[aria-current="true"] .about-toc__num {
  color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .about-content {
  display: grid;
  gap: clamp(40px, 6vw, 72px);
  min-width: 0;
}

.page-about .about-chapter {
  border-top: var(--edge);
  padding-top: clamp(20px, 3vw, 32px);
  scroll-margin-top: calc(var(--header-h) + 26px);
  min-width: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2.4vw, 24px);
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 5.4vw, 4rem);
  font-weight: 700;
  line-height: .94;
  letter-spacing: -.05em;
  color: rgba(201, 162, 39, .16);
  -webkit-text-stroke: 1px var(--gold-soft);
}

.page-about .about-chapter__headtext {
  min-width: 0;
  padding-top: 4px;
}

.page-about .about-chapter__kicker {
  margin: 0 0 5px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .22em;
  color: var(--jade);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.28rem, 2.6vw, 1.85rem);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-chapter__body {
  min-width: 0;
  max-width: 68ch;
}

.page-about .about-chapter__body > p {
  margin: 0 0 1.1em;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--ink-soft);
}

.page-about .inline-link {
  color: var(--gold-lt);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-soft);
}

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

/* ---------- 提示块 ---------- */
.page-about .notice,
.page-about .note {
  margin: 22px 0;
  padding: 16px 18px;
  border-radius: var(--radius);
}

.page-about .notice {
  border: 1px solid rgba(195, 65, 50, .5);
  border-left: 3px solid var(--cinnabar);
  background: rgba(195, 65, 50, .08);
}

.page-about .note {
  border: 1px solid rgba(47, 138, 116, .42);
  border-left: 3px solid var(--jade);
  background: rgba(47, 138, 116, .08);
}

.page-about .notice__label,
.page-about .note__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .2em;
}

.page-about .notice__label {
  color: var(--cinnabar);
}

.page-about .note__label {
  color: var(--jade);
}

.page-about .notice p + p,
.page-about .note p + p {
  margin-top: 7px;
}

.page-about .notice p:last-child,
.page-about .note p:last-child {
  margin-bottom: 0;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--paper);
}

/* ---------- 三条主线 ---------- */
.page-about .tracks {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .track {
  display: flex;
  flex-direction: column;
  gap: 11px;
  padding: clamp(18px, 2.4vw, 26px);
  border: var(--edge);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(28, 41, 66, .62), rgba(17, 26, 46, .92));
  transition: border-color .25s ease, transform .25s ease;
}

.page-about .track:hover {
  border-color: var(--gold-soft);
  transform: translateY(-3px);
}

.page-about .track__top {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .track--jade .track__top {
  color: var(--jade);
}

.page-about .track--slate .track__top {
  color: var(--muted);
}

.page-about .track__dot {
  flex: none;
  width: 8px;
  height: 8px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .track--jade .track__dot {
  background: var(--jade);
}

.page-about .track--slate .track__dot {
  background: var(--muted);
}

.page-about .track__title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .track__desc {
  margin: 0;
  font-size: .92rem;
  line-height: 1.88;
  color: var(--ink-soft);
}

.page-about .track__list {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .track__list li {
  position: relative;
  padding-left: 16px;
  font-size: .85rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .track__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 7px;
  height: 1px;
  background: var(--jade);
}

.page-about .track--jade .track__list li::before {
  background: var(--gold);
}

.page-about .track__link {
  align-self: flex-start;
  margin-top: auto;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--gold-lt);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-soft);
  transition: color .22s ease;
}

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

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 24px 0 26px;
  border: var(--edge);
  border-radius: var(--radius);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.58);
}

.page-about .about-figure--band img {
  max-height: 340px;
}

.page-about .about-figure__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--ab-grid);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 术语表 ---------- */
.page-about .glossary {
  margin: 0;
  border-top: 1px solid var(--ab-grid);
}

.page-about .glossary__row {
  display: grid;
  gap: 8px;
  padding: 16px 14px;
  border-bottom: 1px solid var(--ab-grid);
  border-left: 2px solid transparent;
  transition: background-color .22s ease, border-color .22s ease;
}

.page-about .glossary__row:hover {
  background: rgba(47, 138, 116, .08);
  border-left-color: var(--jade);
}

.page-about .glossary__term {
  margin: 0;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--jade);
}

.page-about .glossary__def {
  margin: 0;
  font-size: .93rem;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  position: relative;
  margin-left: 6px;
  padding: 0 0 26px 28px;
  border-left: 1px solid var(--ab-line);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .timeline__title {
  margin: 6px 0 0;
  font-size: .98rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 6px 0 0;
  font-size: .9rem;
  line-height: 1.88;
  color: var(--ink-soft);
}

/* ---------- 角色与流程 ---------- */
.page-about .roles {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .role {
  padding: 18px 18px 20px;
  border: var(--edge);
  border-top: 2px solid var(--gold);
  border-radius: var(--radius);
  background: var(--ab-panel);
}

.page-about .role--jade {
  border-top-color: var(--jade);
}

.page-about .role--cinnabar {
  border-top-color: var(--cinnabar);
}

.page-about .role__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--gold);
}

.page-about .role--jade .role__count {
  color: var(--jade);
}

.page-about .role--cinnabar .role__count {
  color: var(--cinnabar);
}

.page-about .role__name {
  margin: 8px 0 0;
  font-size: 1rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .role__text {
  margin: 8px 0 0;
  font-size: .88rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .flow {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-grid);
}

.page-about .flow__step {
  display: flex;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--ab-grid);
}

.page-about .flow__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--gold);
  padding-top: 3px;
}

.page-about .flow__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.88;
  color: var(--ink-soft);
}

/* ---------- 合规信息 ---------- */
.page-about .compliance__list {
  margin: 22px 0 0;
  border-top: 1px solid var(--ab-grid);
}

.page-about .compliance__row {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--ab-grid);
}

.page-about .compliance__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .compliance__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .92rem;
  line-height: 1.75;
  color: var(--paper);
  word-break: break-word;
}

.page-about .compliance__note {
  margin: 20px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--cinnabar);
  background: rgba(195, 65, 50, .07);
  font-size: .92rem;
  line-height: 1.9;
  color: var(--paper);
}

.page-about .about-chapter__body .contact-list {
  margin: 18px 0 0;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 平板 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .glossary__row {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

  .page-about .compliance__row {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .tracks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-body__inner {
    grid-template-columns: 246px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-toc .toc__list {
    flex-direction: column;
    gap: 1px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-toc .toc__link {
    width: 100%;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    white-space: normal;
    background: none;
    font-size: .86rem;
  }

  .page-about .about-toc .toc__link[aria-current="true"] {
    border-left-color: var(--gold);
    background: linear-gradient(90deg, rgba(201, 162, 39, .13), transparent 72%);
  }
}

@media (min-width: 1080px) {
  .page-about .tracks {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .track:nth-child(1) {
    grid-column: span 3;
  }

  .page-about .track:nth-child(2) {
    grid-column: span 3;
  }

  .page-about .track:nth-child(3) {
    grid-column: span 6;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .track,
  .page-about .glossary__row,
  .page-about .about-toc .toc__link {
    transition: none;
  }

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