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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--sea-800);
  color: var(--paper);
  padding-block: clamp(34px, 6vw, 70px) clamp(50px, 8vw, 100px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -45%;
  right: -34%;
  width: 80%;
  height: 195%;
  background: var(--sea-700);
  opacity: 0.55;
  transform: rotate(-15deg);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 4%, var(--amber) 38%, var(--amber) 64%, transparent 96%);
}

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

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(24px, 4.5vw, 46px);
}

.page-about .about-hero .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--amber-bright);
}

.page-about .about-hero .breadcrumb__current {
  color: var(--paper);
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--amber-bright);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--amber);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 3vw, 26px);
  max-width: 19ch;
  font-family: var(--font-display);
  font-size: clamp(2.05rem, 5.4vw, 4.1rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.85;
  color: rgba(251, 248, 242, 0.84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

/* ---------- 主体网格 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4.5vw, 40px);
  padding-block: clamp(34px, 6vw, 70px) clamp(48px, 7vw, 88px);
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--line);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--hairline-dark);
  border-radius: 999px;
  white-space: nowrap;
  font-size: 0.84rem;
  color: var(--sea-700);
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-index__link span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--amber);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--amber);
  background: var(--sand);
  color: var(--sea-900);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  border-top: 1px solid var(--hairline-dark);
  padding-top: clamp(26px, 4.5vw, 46px);
  margin-top: clamp(26px, 4.5vw, 46px);
}

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

.page-about .about-section--sand {
  background: var(--sand);
  border-radius: var(--radius);
  padding: clamp(22px, 3.6vw, 38px);
}

.page-about .about-kicker {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 13px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--line);
}

.page-about .about-kicker b {
  font-weight: 700;
  color: var(--amber);
}

.page-about .about-title {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  max-width: 24ch;
  font-family: var(--font-display);
  font-size: clamp(1.42rem, 2.9vw, 2.15rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-prose {
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-prose p {
  margin: 0 0 1em;
}

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

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 4vw, 36px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--sea-800);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--line);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  display: grid;
  gap: 6px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--amber), var(--mist) 72%, transparent);
}

.page-about .about-mile {
  position: relative;
  padding: clamp(13px, 2vw, 18px) clamp(14px, 2.4vw, 22px);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-mile[data-reveal] {
  transition: opacity 0.45s ease, transform 0.45s ease, background-color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-mile::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 25px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--amber);
}

.page-about .about-mile:hover,
.page-about .about-mile:focus-within {
  background: var(--sand);
  border-color: var(--hairline-dark);
}

.page-about .about-mile__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sea-700);
  transition: color 0.25s ease;
}

.page-about .about-mile:hover .about-mile__year {
  color: var(--amber);
}

.page-about .about-mile__quarter {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--line);
}

.page-about .about-mile__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.4;
  color: var(--sea-800);
}

.page-about .about-mile__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  display: grid;
  gap: 14px;
}

.page-about .about-audience__card {
  padding: clamp(17px, 2.6vw, 26px);
  border: 1px solid var(--hairline-dark);
  border-radius: var(--radius);
  background: var(--paper);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease, background-color 0.25s ease;
}

.page-about .about-audience__card:hover {
  border-color: var(--amber);
  background: var(--sand);
  box-shadow: 0 16px 32px -26px rgba(6, 24, 38, 0.7);
  transform: translateY(-2px);
}

.page-about .about-audience__tag {
  display: inline-block;
  margin-bottom: 13px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--amber-bright);
  color: var(--sea-900);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
}

.page-about .about-audience__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--sea-800);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 4vw, 38px);
}

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

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--hairline-dark);
}

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

.page-about .about-roles__num {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--amber);
}

.page-about .about-roles__name {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-display);
  font-size: 0.97rem;
  color: var(--sea-800);
}

.page-about .about-roles p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-cadence li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--sand);
  border-left: 2px solid var(--amber);
}

.page-about .about-cadence__when {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--sea-700);
}

.page-about .about-cadence p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 数据与行动 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(20px, 3.4vw, 30px) 0 clamp(20px, 3.4vw, 30px);
  border: 1px solid var(--hairline-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--hairline-dark);
}

.page-about .about-stat {
  padding: clamp(15px, 2.6vw, 24px);
  background: var(--paper);
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.8vw, 1.85rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--sea-800);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--line);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-about .about-cadence li {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
  }

  .page-about .about-cadence__when {
    padding-top: 3px;
  }
}

@media (min-width: 720px) {
  .page-about .about-prose--columns {
    columns: 2;
    column-gap: clamp(28px, 4vw, 48px);
    max-width: none;
  }

  .page-about .about-prose--columns p {
    break-inside: avoid;
  }

  .page-about .about-mile {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(16px, 2.6vw, 28px);
    align-items: start;
  }

  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 108px;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
  }

  .page-about .about-index__list li + li {
    margin-top: 2px;
  }

  .page-about .about-index__link {
    display: flex;
    width: 100%;
    padding: 7px 0 7px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 0.89rem;
    white-space: normal;
    transition: border-color 0.2s ease, color 0.2s ease;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: transparent;
    border-left-color: var(--amber);
    color: var(--sea-900);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-mile,
  .page-about .about-mile[data-reveal],
  .page-about .about-audience__card,
  .page-about .about-index__link {
    transition: none;
  }

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