.page-about {
  --about-rail-w: 0px;
  --about-rail-gap: 0px;
  padding-bottom: 64px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 30px;
  padding: 22px 0 52px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 7.4vw, 78px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 60ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  margin: 32px 0 0;
  padding-top: 22px;
  border-top: 2px solid var(--line);
}

.page-about .about-hero__facts dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-hero__facts dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: -0.01em;
}

.page-about .about-hero__figure {
  border: 2px solid var(--line-strong);
  box-shadow: 10px 10px 0 rgba(25, 240, 176, 0.12);
  overflow: hidden;
  margin: 0;
}

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

/* ---------- 侧轨 + 正文 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 0;
  padding-top: 6px;
}

.page-about .about-rail {
  display: none;
}

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

.page-about .about-section {
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: 2px solid var(--line-strong);
}

.page-about .about-section__head .lede {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--muted);
  line-height: 1.85;
}

.page-about .about-section h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-section p {
  margin: 10px 0 0;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-section p a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-section p a:hover,
.page-about .about-section p a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 20px 0 20px 24px;
  border-left: 2px solid var(--line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 30px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(25, 240, 176, 0.14);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: 0.02em;
}

.page-about .about-timeline__body {
  margin-top: 6px;
}

/* ---------- 判断标准 ---------- */
.page-about .about-criteria {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 3px;
}

.page-about .about-criteria__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 18px;
  border-left: 2px solid var(--mint-deep);
  background: linear-gradient(90deg, var(--panel), rgba(22, 34, 32, 0) 82%);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-criteria__item:hover,
.page-about .about-criteria__item:focus-within {
  border-left-color: var(--mint);
  background: linear-gradient(90deg, rgba(25, 240, 176, 0.12), rgba(22, 34, 32, 0) 82%);
}

.page-about .about-criteria__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--mint-deep);
  line-height: 1.2;
}

.page-about .about-criteria__item:hover .about-criteria__num {
  color: var(--mint);
}

.page-about .about-criteria__text p {
  margin-top: 8px;
}

.page-about .about-criteria__foot {
  margin-top: 26px;
  padding-left: 18px;
  border-left: 2px solid var(--orange);
  color: var(--muted);
  font-size: 15px;
}

/* ---------- 团队与合作 ---------- */
.page-about .about-team {
  display: grid;
  gap: 30px;
  margin-top: 32px;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-team__list li {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-team__figure {
  border: 2px solid var(--line);
  box-shadow: 8px 8px 0 rgba(255, 122, 47, 0.14);
  overflow: hidden;
  margin: 0;
}

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

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 4px;
  margin-top: 32px;
}

.page-about .about-principles__item {
  padding: 24px 20px;
  background: var(--panel);
  border-top: 2px solid var(--line-strong);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-principles__item:hover {
  background: #1b2c29;
  border-top-color: var(--mint);
}

/* ---------- 折叠面板 ---------- */
.page-about .panel-details {
  margin-top: 30px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  transition: border-color 0.2s ease;
}

.page-about .panel-details[open] {
  border-color: var(--mint-deep);
}

.page-about .panel-details > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
}

.page-about .panel-details > summary::-webkit-details-marker {
  display: none;
}

.page-about .panel-details > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--mint);
  transition: color 0.2s ease;
}

.page-about .panel-details[open] > summary::after {
  content: "−";
  color: var(--orange);
}

.page-about .panel-details__body {
  padding: 18px 20px 22px;
  border-top: 1px solid var(--line);
}

.page-about .panel-details__body p {
  margin: 0 0 14px;
}

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

/* ---------- 资质与备案 ---------- */
.page-about .about-credentials {
  display: grid;
  gap: 30px;
  margin-top: 32px;
}

.page-about .about-credentials__facts {
  margin: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-credentials__facts > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 18px;
  background: var(--panel);
  border-left: 2px solid var(--amber);
}

.page-about .about-credentials__facts dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-credentials__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  word-break: break-word;
}

.page-about .about-credentials__contact {
  margin-top: 22px;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-credentials .btn {
  margin-top: 22px;
}

.page-about .about-credentials__figure {
  border: 2px solid var(--line-strong);
  box-shadow: 10px 10px 0 rgba(25, 240, 176, 0.1);
  overflow: hidden;
  margin: 0;
}

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

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__figure {
    box-shadow: 14px 14px 0 rgba(25, 240, 176, 0.12);
  }

  .page-about .about-criteria__item {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 20px;
    padding: 26px 24px;
  }

  .page-about .about-team__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 32px;
  }

  .page-about .about-team__list li {
    border-bottom: 0;
    padding-bottom: 0;
    padding-left: 14px;
    border-left: 2px solid var(--line);
  }

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

  .page-about .about-credentials__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 3px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 52px;
    align-items: center;
    padding: 36px 0 76px;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding: 24px 0 24px 28px;
  }

  .page-about .about-timeline__item::before {
    top: 34px;
  }

  .page-about .about-timeline__year {
    font-size: 22px;
  }

  .page-about .about-timeline__body {
    margin-top: 0;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-credentials {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about {
    --about-rail-w: 168px;
    --about-rail-gap: 56px;
  }

  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-rail-gap);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 104px;
    padding-left: 18px;
    border-left: 2px solid var(--line-strong);
  }

  .page-about .about-rail__title {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--muted);
    text-transform: uppercase;
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
  }

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

  .page-about .about-rail__list a {
    display: flex;
    gap: 9px;
    align-items: baseline;
    padding: 8px 4px;
    font-size: 13px;
    line-height: 1.5;
    color: var(--muted);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  }

  .page-about .about-rail__list a span {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--mint-deep);
    transition: color 0.2s ease;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    color: var(--mint);
    border-bottom-color: var(--line-strong);
    transform: translateX(4px);
  }

  .page-about .about-rail__list a:hover span,
  .page-about .about-rail__list a:focus-visible span {
    color: var(--amber);
  }

  .page-about .about-rail__note {
    margin: 30px 0 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--mint-deep);
  }

  .page-about .about-section {
    padding: 56px 0;
  }

  .page-about .about-section__head .lede {
    font-size: 17px;
  }
}

@media (min-width: 1320px) {
  .page-about .about-hero .lede {
    font-size: 17px;
  }
}
</PAGE_CSS>