.page-about {
  --about-line: rgba(255, 255, 255, 0.16);
  --about-card-bg: rgba(255, 255, 255, 0.06);
  --about-edge: var(--orange);
  background: var(--light);
  color: var(--ink);
}

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

.page-about a {
  text-underline-offset: 4px;
}

.page-about .breadcrumbs {
  padding-top: 28px;
  padding-bottom: 6px;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(120deg, rgba(255, 77, 36, 0.18), transparent 36%),
    radial-gradient(circle at 82% 18%, rgba(57, 255, 136, 0.14), transparent 24%),
    linear-gradient(135deg, #0b1021 0%, #131a30 68%, #1b243f 100%);
  color: var(--light);
  padding: 34px 0 58px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--green) 100%);
  opacity: 0.9;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
}

.page-about .about-kicker {
  color: var(--orange);
  font-family: var(--font-mono);
  letter-spacing: 0.16em;
  margin-bottom: 14px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-style: italic;
  text-transform: uppercase;
  font-size: clamp(2rem, 4.4vw, 3.6rem);
  line-height: 1.06;
  margin: 0 0 18px;
  text-shadow: 6px 6px 0 rgba(255, 77, 36, 0.22);
}

.page-about .about-hero__lead {
  color: rgba(245, 242, 236, 0.86);
  font-size: 1.02rem;
  line-height: 1.75;
  max-width: 720px;
  margin: 0 0 20px;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ===== 品牌索引卡 ===== */
.page-about .about-id-card {
  position: relative;
  align-self: end;
  background: var(--about-card-bg);
  border: 1px solid var(--about-line);
  border-radius: 18px 0 18px 0;
  padding: 26px 24px 20px 26px;
  box-shadow: 0 18px 44px rgba(2, 5, 16, 0.42);
  backdrop-filter: blur(6px);
}

.page-about .about-id-card::before {
  content: "";
  position: absolute;
  top: 18px;
  left: 18px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: rgba(11, 16, 33, 0.7);
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.page-about .about-id-card__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
  padding-bottom: 12px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-id-card__list {
  margin: 0;
}

.page-about .about-id-card__item {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.page-about .about-id-card__item:last-child {
  border-bottom: 0;
}

.page-about .about-id-card__item dt {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: rgba(255, 255, 255, 0.66);
  padding-top: 3px;
}

.page-about .about-id-card__item dd {
  margin: 0;
  color: var(--light);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.4;
}

/* ===== 档案夹布局 ===== */
.page-about .about-archive {
  display: grid;
  gap: 36px;
  padding-top: 44px;
  padding-bottom: 8px;
}

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

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  border-left: 3px solid var(--orange);
  padding-left: 12px;
  margin: 0 0 16px;
}

.page-about .about-index ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px 10px 12px;
  background: rgba(11, 16, 33, 0.05);
  border: 1px solid rgba(11, 16, 33, 0.12);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  transform: skewX(-6deg);
  transition: background 0.22s var(--ease), color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-index a > span {
  display: inline-block;
  transform: skewX(6deg);
  font-family: var(--font-mono);
}

.page-about .about-index a > span:first-child {
  color: var(--orange);
  font-size: 0.8rem;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--green);
}

.page-about .about-index a:hover > span:first-child,
.page-about .about-index a:focus-visible > span:first-child {
  color: var(--green);
}

/* ===== 内容区块通用 ===== */
.page-about .about-block {
  scroll-margin-top: 150px;
  margin-bottom: 64px;
}

.page-about .about-block__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 26px;
}

.page-about .about-index-label {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--orange);
  background: rgba(255, 77, 36, 0.09);
  border: 1px solid rgba(255, 77, 36, 0.28);
  border-radius: 8px 0 8px 0;
  padding: 8px 12px;
  flex-shrink: 0;
}

.page-about .about-block .section-title {
  margin: 0;
}

.page-about .about-block-lead {
  color: var(--muted);
  line-height: 1.7;
  margin: 0 0 22px;
}

/* ===== 内容体系 ===== */
.page-about .about-system-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-system-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--light);
  border: 1px solid rgba(11, 16, 33, 0.08);
  border-top: 3px solid var(--orange);
  border-radius: 16px 0 16px 0;
  padding: 24px 22px 20px;
  box-shadow: 0 8px 24px rgba(11, 16, 33, 0.05);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-system-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 34px rgba(11, 16, 33, 0.12);
}

.page-about .about-system-card__tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  padding: 4px 9px;
  border-radius: 6px 0 6px 0;
  color: var(--navy);
  background: rgba(11, 16, 33, 0.08);
}

.page-about .about-system-card__title {
  font-family: var(--font-head);
  font-size: 1.12rem;
  line-height: 1.3;
  margin: 0;
}

.page-about .about-system-card__text {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.7;
}

.page-about .about-system-card__meta {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-system-card__meta span {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink);
  background: rgba(11, 16, 33, 0.05);
  border-radius: 4px;
  padding: 3px 7px;
}

.page-about .about-system-card:nth-child(2) {
  border-top-color: var(--violet);
}

.page-about .about-system-card:nth-child(3) {
  border-top-color: var(--cyan);
}

.page-about .about-system-card:nth-child(4) {
  border-top-color: var(--green);
}

.page-about .about-system-card:nth-child(5) {
  border-top-color: var(--navy);
}

/* ===== 覆盖与规模 ===== */
.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .about-stat {
  background: var(--navy);
  color: var(--light);
  padding: 22px 20px;
  border-radius: 14px 0 14px 0;
  border-left: 4px solid var(--green);
  box-shadow: 0 10px 24px rgba(11, 16, 33, 0.16);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  color: var(--green);
  text-shadow: 0 0 16px rgba(57, 255, 136, 0.4);
  margin-bottom: 4px;
}

.page-about .about-stat__label {
  color: rgba(245, 242, 236, 0.86);
  font-size: 0.9rem;
  line-height: 1.55;
}

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

.page-about .about-figure img {
  width: 100%;
  height: auto;
  border-radius: 16px 0 16px 0;
  object-fit: cover;
  box-shadow: 0 18px 40px rgba(11, 16, 33, 0.16);
}

.page-about .about-figure figcaption,
.page-about .about-figure__caption {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--muted);
  border-left: 2px solid var(--cyan);
  padding-left: 10px;
  margin-top: 10px;
}

.page-about .about-team-strip {
  background: var(--navy);
  color: var(--light);
  border-radius: 14px 0 14px 0;
  padding: 18px 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  align-items: center;
  margin: 28px 0 0;
}

.page-about .about-team-strip p {
  margin: 0;
  font-weight: 600;
}

.page-about .about-team-strip__note {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--green);
  flex-basis: 100%;
}

/* ===== 版本演进 ===== */
.page-about .about-version-panel {
  background:
    linear-gradient(120deg, rgba(255, 77, 36, 0.12), transparent 42%),
    var(--navy);
  color: var(--light);
  border-radius: 20px 0 20px 0;
  padding: 34px 22px 24px;
  box-shadow: var(--shadow-2);
}

.page-about .about-version-panel .section-title,
.page-about .about-version-panel .about-block-lead {
  color: var(--light);
}

.page-about .about-timeline {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 9px;
  width: 2px;
  background: linear-gradient(to bottom, var(--orange), var(--green));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 36px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 4px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--navy);
  border: 3px solid var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 77, 36, 0.16);
  transition: border-color 0.25s, box-shadow 0.25s;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  border-color: var(--green);
  box-shadow: 0 0 0 6px rgba(57, 255, 136, 0.22);
}

.page-about .about-timeline__version {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--green);
  font-weight: 700;
}

.page-about .about-timeline__title {
  font-family: var(--font-head);
  font-size: 1.06rem;
  margin: 4px 0 8px;
  color: var(--light);
}

.page-about .about-timeline__desc {
  margin: 0;
  color: rgba(245, 242, 236, 0.78);
  font-size: 0.94rem;
  line-height: 1.75;
}

/* ===== 资质与合作 ===== */
.page-about .about-qual-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 26px;
}

.page-about .about-qual-card {
  background: var(--light);
  border: 1px solid rgba(11, 16, 33, 0.08);
  border-left: 4px solid var(--violet);
  border-radius: 0 12px 0 12px;
  padding: 18px 18px 16px;
}

.page-about .about-qual-card:nth-child(2) {
  border-left-color: var(--cyan);
}

.page-about .about-qual-card:nth-child(3) {
  border-left-color: var(--green);
}

.page-about .about-qual-card:nth-child(4) {
  border-left-color: var(--orange);
}

.page-about .about-qual-card__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-about .about-qual-card__value {
  display: block;
  font-family: var(--font-head);
  font-size: 1.04rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-qual-wide-figure {
  margin: 26px 0 0;
  position: relative;
}

.page-about .about-qual-wide-figure img {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  border-radius: 18px 0 18px 0;
}

.page-about .about-trust-note {
  background: rgba(255, 77, 36, 0.07);
  border: 1px solid rgba(255, 77, 36, 0.22);
  border-radius: 12px;
  padding: 14px 16px;
  margin: 22px 0 0;
  color: var(--ink);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ===== 联系方式 ===== */
.page-about .about-contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  margin: 0 0 20px;
  border-top: 1px solid rgba(11, 16, 33, 0.12);
}

.page-about .about-contact-item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(11, 16, 33, 0.12);
}

.page-about .about-contact-item__label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-contact-item__value {
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
  white-space: normal;
  overflow-wrap: anywhere;
}

.page-about .about-contact-note {
  background: rgba(255, 77, 36, 0.07);
  border: 1px solid rgba(255, 77, 36, 0.22);
  border-radius: 12px;
  padding: 14px 16px;
  color: var(--ink);
  font-size: 0.92rem;
  line-height: 1.7;
  margin: 0 0 22px;
}

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

/* ===== 响应式增强 ===== */
@media (min-width: 640px) {
  .page-about .about-system-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .page-about .about-contact-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
    gap: 48px;
  }

  .page-about .about-archive {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 52px;
    padding-top: 56px;
  }

  .page-about .about-index {
    position: sticky;
    top: 130px;
    align-self: start;
  }

  .page-about .about-index ul {
    flex-direction: column;
    gap: 8px;
  }

  .page-about .about-index a {
    width: 100%;
  }

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

  .page-about .about-system-card:nth-child(4),
  .page-about .about-system-card:nth-child(5) {
    grid-column: span 3;
    flex-direction: row;
    align-items: center;
    gap: 28px;
  }

  .page-about .about-system-card:nth-child(4) .about-system-card__text,
  .page-about .about-system-card:nth-child(5) .about-system-card__text {
    flex: 1;
    margin-top: 0;
  }

  .page-about .about-system-card:nth-child(4) .about-system-card__meta,
  .page-about .about-system-card:nth-child(5) .about-system-card__meta {
    margin-top: 0;
  }

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

  .page-about .about-timeline__item {
    padding-left: 56px;
  }

  .page-about .about-timeline::before {
    left: 14px;
  }

  .page-about .about-version-panel {
    padding: 44px 38px 30px;
  }

  .page-about .about-qual-card {
    padding: 22px 22px 20px;
  }

  .page-about .about-qual-wide-figure img {
    max-height: 420px;
  }
}