.page-about {
  --about-line: rgba(199, 210, 220, 0.14);
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-serif);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 60px;
  border-bottom: 1px solid var(--border-dark);
  background-image:
    repeating-linear-gradient(90deg, rgba(199, 210, 220, 0.045) 0 1px, transparent 1px 96px),
    radial-gradient(120% 92% at 86% -6%, rgba(0, 229, 255, 0.12), transparent 60%),
    linear-gradient(180deg, var(--ink-850), var(--ink-900));
}

.page-about .about-crumb {
  margin-bottom: 34px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
}

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

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(30px, 5.6vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 14em;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cyan);
  position: relative;
  display: inline-block;
}

.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.02em;
  height: 6px;
  background: var(--cyan-soft);
  z-index: -1;
}

.page-about .about-hero__lead {
  margin: 24px 0 0;
  max-width: 34em;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--border-dark);
  border: 1px solid var(--border-dark);
  align-self: end;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 16px;
  background: var(--ink-800);
  transition: background var(--dur) var(--ease);
}

.page-about .about-stat:hover {
  background: var(--ink-700);
}

.page-about .about-stat--wide {
  grid-column: 1 / -1;
  background: linear-gradient(90deg, var(--ink-700), var(--ink-800));
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-stat--wide .about-stat__num {
  font-size: 32px;
}

.page-about .about-stat__unit {
  font-size: 0.58em;
  color: var(--grey);
  margin-left: 3px;
}

.page-about .about-stat__label {
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  position: relative;
  padding: 56px 0;
  border-bottom: 1px solid var(--border-dark);
}

.page-about .about-section__head {
  max-width: 720px;
  margin-bottom: 34px;
}

.page-about .about-section__num {
  display: inline-block;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-cyan);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-section__title {
  margin: 18px 0 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(23px, 4vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-section__lead {
  margin: 16px 0 0;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 历程 ---------- */
.page-about .about-history__media {
  margin: 0 0 40px;
  border: 1px solid var(--border-dark);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(199, 210, 220, 0.16) 72%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 34px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 13px;
  height: 13px;
  transform: rotate(45deg);
  background: var(--ink-900);
  border: 1px solid var(--border-cyan);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(0, 229, 255, 0.14);
}

.page-about .about-timeline__stage {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  color: var(--white);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 46em;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 32px;
}

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

.page-about .about-fold {
  margin-bottom: 10px;
  border: 1px solid var(--border-dark);
  background: var(--ink-800);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-fold:hover {
  border-color: var(--border-cyan);
}

.page-about .about-fold[open] {
  background: var(--ink-700);
  border-color: var(--border-cyan);
}

.page-about .about-fold__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-fold__head::-webkit-details-marker {
  display: none;
}

.page-about .about-fold__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-fold[open] .about-fold__head::after {
  content: "−";
}

.page-about .about-fold__body {
  padding: 0 18px 18px;
}

.page-about .about-fold__body p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-team__note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--border-dark);
}

/* ---------- 资料库 ---------- */
.page-about .about-library {
  display: grid;
  gap: 24px;
}

.page-about .about-library__media {
  margin: 0;
  border: 1px solid var(--border-dark);
}

.page-about .about-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-dark);
  background: var(--ink-850);
}

.page-about .about-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 14px;
}

.page-about .about-table__caption {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--grey);
  background: var(--ink-850);
  border-bottom: 1px solid var(--border-dark);
}

.page-about .about-table th {
  padding: 13px 16px;
  text-align: left;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
  background: var(--ink-800);
  border-bottom: 1px solid var(--border-dark);
}

.page-about .about-table td {
  padding: 15px 16px;
  vertical-align: top;
  line-height: 1.7;
  color: var(--text);
  border-bottom: 1px solid var(--border-dark);
}

.page-about .about-table tbody tr {
  transition: background var(--dur) var(--ease);
}

.page-about .about-table tbody tr:hover {
  background: rgba(0, 229, 255, 0.05);
}

.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table td:first-child {
  font-weight: 700;
  color: var(--white);
}

.page-about .about-table .mono {
  font-size: 12.5px;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-library__more {
  margin: 20px 0 0;
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .about-library__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--border-cyan);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-library__more a:hover {
  color: var(--white);
  border-color: var(--white);
}

/* ---------- 生态 ---------- */
.page-about .about-eco {
  display: grid;
  gap: 20px;
}

.page-about .about-eco__block {
  padding: 24px 22px;
  background: var(--ink-800);
  border-left: 2px solid var(--cyan);
}

.page-about .about-eco__block--alt {
  background: var(--ink-850);
  border-left-color: var(--grey);
}

.page-about .about-eco__tag {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-eco__block--alt .about-eco__tag {
  color: var(--grey);
}

.page-about .about-eco__title {
  margin: 12px 0 12px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-eco__text {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-eco__list li {
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-eco__list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-eco__list strong {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--white);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 1px;
  background: var(--border-dark);
  border: 1px solid var(--border-dark);
}

.page-about .about-principle {
  padding: 22px 20px;
  background: var(--ink-800);
  transition: background var(--dur) var(--ease);
}

.page-about .about-principle:hover {
  background: var(--ink-700);
}

.page-about .about-principle__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-principle__title {
  margin: 10px 0 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--white);
}

.page-about .about-principle__text {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  padding: 52px 0 68px;
  background: linear-gradient(180deg, var(--ink-900), var(--ink-850));
}

.page-about .about-cta__panel {
  display: grid;
  gap: 22px;
  padding: 28px 22px;
  border: 1px solid var(--border-cyan);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(255, 106, 0, 0.05));
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 26px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 10px 0 0;
  max-width: 46em;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

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

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero {
    padding: 32px 0 72px;
  }

  .page-about .about-section {
    padding: 68px 0;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    gap: 56px;
    align-items: end;
  }

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-library {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 28px;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 36px 34px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }

  .page-about .about-timeline__item {
    padding-left: 40px;
  }
}

@media (min-width: 1140px) {
  .page-about .about-section {
    padding: 76px 0;
  }

  .page-about .about-hero {
    padding: 36px 0 84px;
  }
}