.page-about {
  --about-axis: rgba(58, 78, 107, 0.85);
  --about-glow: rgba(47, 227, 210, 0.1);
  --about-seal: rgba(242, 169, 59, 0.55);
  display: block;
  position: relative;
  background:
    radial-gradient(1000px 560px at 86% -8%, var(--about-glow), transparent 60%),
    radial-gradient(720px 520px at -12% 34%, rgba(107, 106, 134, 0.14), transparent 64%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
}

.page-about .about-hero {
  padding: clamp(26px, 5vw, 56px) 0 clamp(18px, 3vw, 30px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 38px);
  align-items: end;
}

.page-about .about-hero__eyebrow {
  color: var(--amber);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--white);
  max-width: 18em;
}

.page-about .about-hero__lead {
  margin: 18px 0 22px;
  max-width: 46em;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .breadcrumb__current {
  color: var(--text-mute);
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-deep);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 6;
}

.page-about .media-frame__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--text-mute);
}

.page-about .about-hero__strip {
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .data-cell__value {
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .data-cell__label {
  color: var(--text-mute);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(46px, 8vw, 92px) 0 0;
}

.page-about .about-section--last {
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-about .section__eyebrow {
  color: var(--amber);
  margin: 0 0 12px;
}

.page-about .section__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--white);
  max-width: 22em;
}

.page-about .section__lead {
  margin: 0 0 clamp(22px, 3vw, 36px);
  max-width: 52em;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- P01 编号索引 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: 1px solid var(--line);
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 18px;
  background: linear-gradient(180deg, rgba(22, 48, 79, 0.72), rgba(11, 27, 51, 0.4));
  border-bottom: 1px solid var(--line-soft);
  position: relative;
  transition: background 320ms var(--ease);
}

.page-about .about-fact::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: var(--steel);
  transition: background 320ms var(--ease);
}

.page-about .about-fact:hover::before {
  background: var(--cyan);
}

.page-about .about-fact__id {
  color: var(--amber);
  align-self: start;
}

.page-about .about-fact__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: -0.01em;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-fact__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- P02 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .team-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--panel);
  align-self: start;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .team-stack {
  display: grid;
  gap: 16px;
}

.page-about .team-card {
  background: linear-gradient(150deg, rgba(22, 48, 79, 0.94), rgba(7, 19, 34, 0.9));
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), rgba(47, 227, 210, 0));
  opacity: 0.75;
}

.page-about .team-card .panel__num {
  color: var(--cyan);
}

.page-about .team-card .panel__title {
  color: var(--white);
  font-family: var(--font-display);
}

.page-about .team-card .panel__lead {
  color: var(--text-dim);
  font-family: var(--font-body);
}

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

.page-about .team-card__list li {
  position: relative;
  padding-left: 20px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .team-card__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--amber);
}

.page-about .team-card__toggle {
  margin-top: 14px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: border-color 240ms var(--ease), color 240ms var(--ease);
}

.page-about .team-card__toggle:hover {
  border-color: var(--mist);
  color: var(--mist);
}

.page-about .team-card.is-collapsed [data-panel-body] {
  display: none;
}

/* ---------- P03 时间轴 ---------- */
.page-about .about-axis {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--steel) 0%, var(--amber) 52%, var(--cyan) 100%);
}

.page-about .about-axis__item {
  position: relative;
  width: 100%;
}

.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 169, 59, 0.15);
}

.page-about .about-axis__item.is-current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(47, 227, 210, 0.18);
}

.page-about .axis-card {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(155deg, rgba(22, 48, 79, 0.9), rgba(7, 19, 34, 0.88));
}

.page-about .axis-card .panel__num {
  color: var(--amber);
}

.page-about .axis-card .panel__title {
  color: var(--white);
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 21px);
  letter-spacing: -0.01em;
}

.page-about .axis-card .panel__lead {
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .axis-card__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .axis-card__list li {
  position: relative;
  padding-left: 18px;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .axis-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 1px;
  background: var(--steel);
}

.page-about .axis-card__flag {
  margin: 16px 0 0;
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid rgba(47, 227, 210, 0.5);
  border-radius: var(--radius-sm);
  color: var(--cyan);
}

/* ---------- P04 资质 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.page-about .filter-chip {
  padding: 7px 15px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(22, 48, 79, 0.5);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: border-color 240ms var(--ease), color 240ms var(--ease), background 240ms var(--ease);
}

.page-about .filter-chip:hover {
  border-color: var(--mist);
  color: var(--mist);
}

.page-about .filter-chip[aria-pressed="true"] {
  border-color: var(--cyan);
  background: rgba(47, 227, 210, 0.14);
  color: var(--cyan);
}

.page-about .filter-status {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-mute);
}

.page-about .cred-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .cred-card {
  position: relative;
  padding-top: 30px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(22, 48, 79, 0.82), rgba(7, 19, 34, 0.86));
  overflow: hidden;
  transition: transform 320ms var(--ease), border-color 320ms var(--ease);
}

.page-about .cred-card::after {
  content: "";
  position: absolute;
  right: -34px;
  top: -34px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 227, 210, 0.16), transparent 70%);
}

.page-about .cred-card:hover {
  transform: translateY(-3px);
  border-color: rgba(47, 227, 210, 0.4);
}

.page-about .cred-card__seal {
  position: absolute;
  left: 20px;
  top: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px dashed var(--about-seal);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--amber);
  background: rgba(242, 169, 59, 0.06);
}

.page-about .cred-card .info-card__tag {
  margin-left: 46px;
  color: var(--amber);
}

.page-about .cred-card .info-card__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .cred-card .info-card__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.76;
  color: var(--text-dim);
}

.page-about .cred-card .info-card__meta {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  color: var(--text-mute);
}

/* ---------- P05 网络 ---------- */
.page-about .net-strip {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .net-layout {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .net-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-deep);
}

.page-about .net-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .net-panel {
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: rgba(7, 19, 34, 0.72);
}

.page-about .net-panel__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 20px);
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .net-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 14px;
}

.page-about .net-list__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--text-dim);
}

.page-about .net-list__item .mono-label {
  color: var(--amber);
}

.page-about .net-panel__note {
  margin: 18px 0 0;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-mute);
}

/* ---------- P06 联络 ---------- */
.page-about .contact-panel {
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(160deg, rgba(22, 48, 79, 0.86), rgba(7, 19, 34, 0.92));
  box-shadow: var(--shadow-panel);
}

.page-about .contact-rows {
  margin: 0 0 22px;
  display: grid;
  gap: 14px;
}

.page-about .contact-row {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .contact-row__label {
  margin: 0;
  color: var(--amber);
}

.page-about .contact-row__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.03em;
  color: var(--white);
  word-break: break-word;
}

.page-about .contact-note {
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}

.page-about .contact-note p {
  margin: 0;
  max-width: 60em;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.page-about .contact-trace {
  margin: 0;
  color: var(--text-mute);
}

/* ---------- 侧边索引 ---------- */
.page-about .index-rail {
  display: none;
}

/* ---------- 动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .cred-card:hover {
    transform: none;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-fact {
    grid-template-columns: 96px 1fr;
    align-items: start;
    padding: 22px 24px;
  }

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

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-about .about-hero__figure {
    transform: translateY(14px);
  }

  .page-about .team-layout {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }

  .page-about .axis-card {
    max-width: none;
  }

  .page-about .about-axis__item--v1 {
    width: 74%;
  }

  .page-about .about-axis__item--v2 {
    width: 82%;
    margin-left: 4%;
  }

  .page-about .about-axis__item--v3 {
    width: 90%;
    margin-left: 8%;
  }

  .page-about .about-axis__item--v4 {
    width: 100%;
    margin-left: 12%;
    max-width: 94%;
  }

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

  .page-about .net-layout {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

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

@media (min-width: 1180px) {
  .page-about .index-rail {
    display: flex;
    flex-direction: column;
    gap: 9px;
    position: fixed;
    left: max(14px, calc((100vw - var(--wrap)) / 2 - 104px));
    top: 50%;
    transform: translateY(-50%);
    z-index: 40;
  }

  .page-about .index-rail__link {
    display: flex;
    align-items: center;
    gap: 7px;
    padding: 5px 10px;
    border-left: 2px solid var(--line-soft);
    font-family: var(--font-body);
    font-size: 12.5px;
    color: var(--text-mute);
    text-decoration: none;
    transition: color 240ms var(--ease), border-color 240ms var(--ease);
  }

  .page-about .index-rail__link .mono-label {
    color: var(--steel);
    transition: color 240ms var(--ease);
  }

  .page-about .index-rail__link:hover,
  .page-about .index-rail__link.is-active {
    color: var(--cyan);
    border-left-color: var(--cyan);
  }

  .page-about .index-rail__link:hover .mono-label,
  .page-about .index-rail__link.is-active .mono-label {
    color: var(--mist);
  }
}