.page-about {
  --about-index-w: 236px;
  display: block;
}

/* ---------- 顶部区 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 60px) 0 clamp(44px, 7vw, 84px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(130% 100% at 86% -20%, rgba(43, 227, 176, .16), transparent 58%),
    radial-gradient(90% 80% at 4% 112%, rgba(255, 176, 32, .09), transparent 62%);
}

.page-about .about-hero .eyebrow {
  margin: clamp(20px, 3vw, 32px) 0 0;
  color: var(--mint);
}

.page-about .about-title {
  margin: 16px 0 0;
  max-width: 21ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 58px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-lede {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 40ch;
  font-size: clamp(15.5px, 1.7vw, 17.5px);
  line-height: 1.82;
  color: var(--text-muted);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 22px;
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--line-soft);
  list-style: none;
}

.page-about .fact-item {
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .fact-label {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* ---------- 主体布局 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-top: clamp(48px, 8vw, 104px);
}

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

/* ---------- 右侧编号索引 ---------- */
.page-about .about-index {
  min-width: 0;
  padding-top: 4px;
}

.page-about .index-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 10px 10px 12px;
  border-left: 2px solid var(--line);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13.5px;
  line-height: 1.4;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  color: var(--mint);
  border-left-color: var(--mint);
  background: var(--accent-soft);
}

.page-about .index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mint-600);
  flex: none;
}

.page-about .index-text {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-bottom: clamp(56px, 8vw, 104px);
  scroll-margin-top: 128px;
}

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

.page-about .section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .section-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mint);
}

.page-about .section-head h2 {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-p {
  max-width: 38em;
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-pull {
  margin: 30px 0 0;
  padding: 6px 0 6px 22px;
  max-width: 30em;
  border-left: 3px solid var(--line);
  font-family: var(--font-display);
  font-size: clamp(19px, 2.5vw, 26px);
  line-height: 1.55;
  color: var(--text);
  transition: border-color var(--ease);
}

.page-about .about-pull:hover {
  border-left-color: var(--mint);
}

/* ---------- 三条要点 ---------- */
.page-about .point-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .point-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--mint-600);
  border-radius: var(--r-sm);
  background: var(--surface);
  transition: background var(--ease), border-color var(--ease);
}

.page-about .point-item:hover {
  background: var(--surface-solid);
  border-left-color: var(--mint);
}

.page-about .point-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .point-title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

.page-about .point-text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--text-muted);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .about-figure .media-frame {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-1);
}

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

.page-about .about-frame--wide {
  aspect-ratio: 7 / 3;
}

.page-about .about-figure .media-caption {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 20px;
  padding-bottom: 34px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 38px;
  top: 84px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--line), rgba(22, 64, 95, .18));
}

.page-about .tl-item:last-child::before {
  content: none;
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 78px;
  top: 38px;
  width: 20px;
  height: 1px;
  background: var(--line);
  transition: background var(--ease);
}

.page-about .tl-item:hover::after,
.page-about .tl-item:focus-within::after {
  background: var(--mint);
}

.page-about .tl-node {
  width: 78px;
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--accent-line);
  background: radial-gradient(circle at 30% 24%, rgba(43, 227, 176, .2), rgba(7, 26, 43, .92) 72%);
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.01em;
  color: var(--mint);
  transition: border-color var(--ease), box-shadow var(--ease), color var(--ease);
}

.page-about .tl-item:hover .tl-node,
.page-about .tl-item:focus-within .tl-node {
  border-color: var(--mint);
  box-shadow: 0 0 0 8px var(--accent-soft);
  color: var(--cold-white);
}

.page-about .tl-body {
  min-width: 0;
  padding-top: 2px;
}

.page-about .tl-season {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .tl-title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--text);
}

.page-about .tl-text {
  margin: 8px 0 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-muted);
}

/* ---------- 三组分工 ---------- */
.page-about .crew-row {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .crew-tag {
  padding: 20px 20px 22px;
  border-radius: var(--r-sm);
  color: var(--night-900);
  box-shadow: var(--shadow-1);
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-about .crew-tag:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-about .crew-tag--edit {
  background: var(--mint-50);
}

.page-about .crew-tag--data {
  background: var(--amber-50);
}

.page-about .crew-tag--exp {
  background: var(--cold-white);
}

.page-about .crew-role {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: rgba(7, 26, 43, .52);
}

.page-about .crew-name {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--night-900);
}

.page-about .crew-text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(7, 26, 43, .8);
}

/* ---------- 主色块 ---------- */
.page-about .swatch-row {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.page-about .swatch {
  padding: 48px 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  transition: transform var(--ease);
}

.page-about .swatch:hover {
  transform: translateY(-4px);
}

.page-about .swatch--night {
  background: linear-gradient(160deg, var(--night-800), var(--night-900));
}

.page-about .swatch--mint {
  background: linear-gradient(160deg, var(--mint), var(--mint-600));
}

.page-about .swatch--amber {
  background: linear-gradient(160deg, var(--amber), var(--amber-deep));
}

.page-about .swatch-name {
  display: block;
  font-size: 13px;
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.page-about .swatch--night .swatch-name {
  color: var(--cold-white);
}

.page-about .swatch--mint .swatch-name,
.page-about .swatch--amber .swatch-name {
  color: var(--night-900);
}

/* ---------- 服务与反馈 ---------- */
.page-about .service-card {
  margin-top: 28px;
  padding: clamp(22px, 3.4vw, 34px);
  border: 1px solid var(--accent-line);
  border-radius: var(--r-card);
  background: linear-gradient(150deg, rgba(43, 227, 176, .1), rgba(14, 44, 69, .74) 58%);
  box-shadow: var(--shadow-2);
}

.page-about .service-line {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .service-line + .service-line {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-links {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-links-item {
  font-size: 15px;
  line-height: 1.6;
}

/* ---------- 响应式 ---------- */
@media (min-width: 520px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 28px;
  }
}

@media (max-width: 519px) {
  .page-about .tl-item {
    grid-template-columns: 60px minmax(0, 1fr);
    gap: 14px;
    padding-bottom: 28px;
  }

  .page-about .tl-node {
    width: 60px;
    height: 60px;
    font-size: 11.5px;
  }

  .page-about .tl-item::before {
    left: 29px;
    top: 66px;
  }

  .page-about .tl-item::after {
    left: 60px;
    top: 30px;
    width: 14px;
  }

  .page-about .swatch {
    padding: 40px 10px 12px;
  }

  .page-about .swatch-name {
    font-size: 11.5px;
  }
}

@media (min-width: 760px) {
  .page-about .crew-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) var(--about-index-w);
    gap: 72px;
    align-items: start;
  }

  .page-about .about-column {
    order: 1;
  }

  .page-about .about-index {
    order: 2;
    position: sticky;
    top: 132px;
  }

  .page-about .about-p {
    font-size: 16px;
  }
}