/* ===== 品牌档案页 · page-about ===== */
.page-about {
  max-width: 100%;
  overflow-x: hidden;
  background: var(--color-bg-dark);
}

.page-about .container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.2rem;
  box-sizing: border-box;
}

.page-about .section__head {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  margin-bottom: 1.6rem;
}

.page-about .section-index {
  font-family: var(--font-heading);
  font-size: var(--size-tiny);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .section-title {
  font-family: var(--font-heading);
  font-weight: 300;
  font-size: var(--size-title);
  letter-spacing: 0.02em;
  margin: 0;
}

/* ————— 首屏档案封面 ————— */
.about-hero {
  position: relative;
  padding: 3rem 0 2.8rem;
  background:
    radial-gradient(ellipse 120% 70% at 85% 15%, rgba(224, 170, 78, 0.12), transparent 55%),
    radial-gradient(ellipse 80% 60% at 5% 95%, rgba(214, 64, 64, 0.09), transparent 60%),
    var(--color-bg-dark);
  color: var(--color-bg-light);
  overflow: hidden;
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 12% 24%, rgba(242, 201, 110, 0.9), transparent),
    radial-gradient(1px 1px at 24% 61%, rgba(255, 255, 255, 0.7), transparent),
    radial-gradient(1px 1px at 36% 14%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1px 1px at 58% 38%, rgba(242, 201, 110, 0.6), transparent),
    radial-gradient(1px 1px at 74% 22%, rgba(255, 255, 255, 0.75), transparent),
    radial-gradient(1px 1px at 88% 72%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1px 1px at 44% 88%, rgba(255, 255, 255, 0.55), transparent);
}

.about-hero .container {
  position: relative;
  z-index: 1;
}

.about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.about-hero__content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.9rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  font-size: var(--size-tiny);
  letter-spacing: 0.08em;
  color: var(--color-gold);
  text-transform: uppercase;
}

.breadcrumb a {
  color: rgba(245, 239, 230, 0.72);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-gold-light);
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-gold-light);
}

.about-hero__kicker {
  font-family: var(--font-heading);
  font-size: var(--size-tiny);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.about-hero .page-title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 300;
  font-size: var(--size-1);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--color-bg-light);
}

.about-hero__lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-gold-light);
  border-left: 3px solid var(--color-gold);
  padding-left: 1rem;
}

.about-hero__desc {
  margin: 0;
  font-size: var(--size-sub);
  line-height: 1.8;
  color: rgba(245, 239, 230, 0.82);
}

.about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.4rem;
}

.about-hero__tags a {
  display: inline-block;
  border: 1px solid rgba(224, 170, 78, 0.55);
  border-radius: 999px;
  color: var(--color-gold);
  font-size: var(--size-tiny);
  letter-spacing: 0.04em;
  padding: 0.38rem 0.78rem;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.about-hero__tags a:hover,
.about-hero__tags a:focus-visible {
  background: var(--color-gold);
  border-color: var(--color-gold);
  color: var(--color-bg-dark);
}

.about-hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.img-frame--wide {
  display: block;
  width: 100%;
  max-width: 600px;
  border: 1px solid rgba(242, 201, 110, 0.26);
  background: rgba(27, 42, 74, 0.6);
  padding: 0.5rem;
  box-sizing: border-box;
}

.img-frame--wide img {
  display: block;
  width: 100%;
  height: auto;
}

.img-frame--wide figcaption {
  margin-top: 0.5rem;
  font-size: var(--size-tiny);
  line-height: 1.5;
  color: rgba(245, 239, 230, 0.62);
}

/* ————— 时间轴：档案卷宗 ————— */
.about-timeline {
  padding: var(--space-section) 0 2rem;
  background:
    linear-gradient(180deg, var(--color-bg-dark) 0%, rgba(27, 42, 74, 0.55) 6%, var(--color-bg-light) 14%);
  color: var(--color-ink);
}

.about-timeline .section-index {
  color: var(--color-bg-dark);
}

.about-timeline__intro {
  max-width: 46rem;
  margin: 0 0 2rem;
  font-size: var(--size-sub);
  line-height: 1.8;
  color: var(--color-blue-secondary);
}

.about-timeline__list-wrap {
  position: relative;
}

.about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  position: relative;
}

.about-timeline__list::before {
  content: "";
  position: absolute;
  left: 0.62rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold), var(--color-blue-secondary) 55%, var(--color-accent));
  opacity: 0.55;
}

.about-timeline__entry {
  position: relative;
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.75rem;
  align-items: start;
}

.about-timeline__year {
  position: relative;
  z-index: 1;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: var(--color-bg-light);
  border: 2px solid var(--color-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--color-bg-dark);
  margin-top: 0.9rem;
}

.about-timeline__panel {
  background: var(--color-bg-light);
  border: 1px solid rgba(27, 42, 74, 0.12);
  border-radius: var(--radius);
  box-shadow:
    4px 4px 0 rgba(27, 42, 74, 0.06),
    8px 8px 0 rgba(27, 42, 74, 0.04);
  padding: 0.9rem 1rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.about-timeline__entry:hover .about-timeline__panel,
.about-timeline__entry:focus-within .about-timeline__panel {
  box-shadow:
    4px 4px 0 rgba(224, 170, 78, 0.18),
    12px 12px 0 rgba(27, 42, 74, 0.08);
  transform: translateY(-2px);
}

.about-timeline__panel details > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

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

.about-timeline__panel details > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

.about-timeline__panel details[open] > summary::after {
  content: "−";
  transform: rotate(180deg);
}

.about-timeline__badge {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(214, 64, 64, 0.08);
  border: 1px solid rgba(214, 64, 64, 0.22);
  border-radius: 999px;
  padding: 0.12rem 0.48rem;
}

.about-timeline__panel details p {
  margin: 0.7rem 0 0;
  font-size: var(--size-sub);
  line-height: 1.72;
  color: rgba(34, 34, 34, 0.78);
  border-top: 1px dashed rgba(27, 42, 74, 0.14);
  padding-top: 0.65rem;
}

/* 星轨分隔线 */
.about-orbit {
  margin: 2.2rem 0 0;
  color: var(--color-gold);
  opacity: 0.7;
}

.orbit-track--compact {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.about-orbit svg {
  display: block;
  width: 100%;
  height: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

/* ————— 数据与统计网络 ————— */
.about-data {
  background:
    radial-gradient(ellipse 90% 80% at 0% 100%, rgba(214, 64, 64, 0.08), transparent 60%),
    radial-gradient(ellipse 90% 60% at 100% 0%, rgba(224, 170, 78, 0.1), transparent 50%),
    var(--color-bg-dark);
  color: var(--color-bg-light);
  padding: var(--space-section) 0;
}

.about-data .section-index {
  color: var(--color-gold);
}

.about-data .section-title {
  color: var(--color-bg-light);
}

.about-data__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.about-data__visual {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.about-data__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 700px;
  border: 1px solid rgba(224, 170, 78, 0.2);
  border-radius: var(--radius);
  background: rgba(27, 42, 74, 0.45);
  padding: 0.4rem;
  box-sizing: border-box;
}

.about-data__caption {
  margin: 0;
  font-size: var(--size-tiny);
  line-height: 1.5;
  color: rgba(245, 239, 230, 0.55);
}

.about-data__lead {
  margin: 0 0 1.4rem;
  font-size: var(--size-sub);
  line-height: 1.8;
  color: rgba(245, 239, 230, 0.86);
}

.about-chart {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 0 0 1.4rem;
}

.about-chart__item {
  display: grid;
  grid-template-columns: 6.2rem 1fr 3.8rem;
  align-items: center;
  gap: 0.6rem;
}

.about-chart__key {
  font-size: var(--size-tiny);
  letter-spacing: 0.04em;
  color: rgba(245, 239, 230, 0.72);
}

.about-chart__bar {
  height: 0.6rem;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
}

.about-chart__bar span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-gold-light) 100%);
  transition: filter 0.2s ease;
}

.about-chart__item:hover .about-chart__bar span {
  filter: brightness(1.15);
}

.about-chart__value {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  text-align: right;
  color: var(--color-bg-light);
}

.about-data__note {
  margin: 0;
  font-size: var(--size-sub);
  line-height: 1.8;
  color: rgba(245, 239, 230, 0.72);
  border-left: 2px solid var(--color-accent);
  padding-left: 0.9rem;
}

/* ————— 安全与认证 ————— */
.about-security {
  background:
    radial-gradient(ellipse 80% 70% at 90% 10%, rgba(224, 170, 78, 0.09), transparent 55%),
    var(--color-bg-light);
  color: var(--color-ink);
  padding: var(--space-section) 0;
}

.about-security .section-index {
  color: var(--color-blue-secondary);
}

.about-security__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.about-security__card {
  background: var(--color-bg-white);
  border: 1px solid rgba(27, 42, 74, 0.12);
  border-radius: var(--radius);
  box-shadow:
    4px 4px 0 rgba(27, 42, 74, 0.05),
    8px 8px 0 rgba(27, 42, 74, 0.03);
  padding: 1.3rem 1.2rem;
  position: relative;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.about-security__card:hover,
.about-security__card:focus-within {
  box-shadow:
    4px 4px 0 rgba(224, 170, 78, 0.18),
    12px 12px 0 rgba(27, 42, 74, 0.06);
  transform: translateY(-2px);
}

.about-security__code {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid rgba(214, 64, 64, 0.28);
  border-radius: 999px;
  padding: 0.18rem 0.6rem;
  margin-bottom: 0.7rem;
}

.about-security__card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.about-security__card p {
  margin: 0;
  font-size: var(--size-sub);
  line-height: 1.72;
  color: rgba(34, 34, 34, 0.78);
}

.about-security__card a {
  display: inline-block;
  margin-top: 0.8rem;
  color: var(--color-accent);
  font-size: var(--size-tiny);
  letter-spacing: 0.04em;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.about-security__card a:hover,
.about-security__card a:focus-visible {
  color: var(--color-accent-dark);
  border-bottom-style: dashed;
}

/* ————— 团队与服务能力 ————— */
.about-team {
  background:
    radial-gradient(ellipse 100% 70% at 0% 0%, rgba(224, 170, 78, 0.1), transparent 55%),
    var(--color-bg-dark);
  color: var(--color-bg-light);
  padding: var(--space-section) 0;
}

.about-team .section-index {
  color: var(--color-gold);
}

.about-team__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
}

.about-team__text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.9rem;
}

.about-team__text p {
  margin: 0;
  font-size: var(--size-sub);
  line-height: 1.8;
  color: rgba(245, 239, 230, 0.84);
}

.about-team__link,
.about-users__link {
  display: inline-block;
  margin-top: 0.4rem;
  background: var(--color-accent);
  color: var(--color-bg-white);
  border-radius: 6px;
  padding: 0.55rem 1rem;
  font-size: var(--size-tiny);
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.about-team__link:hover,
.about-team__link:focus-visible,
.about-users__link:hover,
.about-users__link:focus-visible {
  background: var(--color-accent-dark);
}

.about-team__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 500px;
  border: 1px solid rgba(224, 170, 78, 0.2);
  border-radius: var(--radius);
  background: rgba(27, 42, 74, 0.45);
  padding: 0.4rem;
  box-sizing: border-box;
}

/* ————— 用户与服务范围 ————— */
.about-users {
  background:
    linear-gradient(180deg, var(--color-bg-light) 0%, rgba(245, 239, 230, 0.96) 100%);
  color: var(--color-ink);
  padding: var(--space-section) 0;
}

.about-users .section-index {
  color: var(--color-blue-secondary);
}

.about-users__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.about-users__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}

.about-users__stat {
  background: var(--color-bg-white);
  border: 1px solid rgba(27, 42, 74, 0.12);
  border-top: 3px solid var(--color-gold);
  border-radius: var(--radius);
  padding: 1rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: box-shadow 0.2s ease;
}

.about-users__stat:hover {
  box-shadow: 0 8px 20px rgba(27, 42, 74, 0.08);
}

.about-users__num {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.1;
  color: var(--color-bg-dark);
}

.about-users__label {
  font-size: var(--size-tiny);
  letter-spacing: 0.05em;
  color: var(--color-blue-secondary);
}

.about-users__content {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.about-users__content p {
  margin: 0;
  font-size: var(--size-sub);
  line-height: 1.8;
  color: rgba(34, 34, 34, 0.8);
}

/* ————— 关联档案导航 ————— */
.about-explore {
  background:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(242, 201, 110, 0.12), transparent 55%),
    var(--color-bg-dark);
  color: var(--color-bg-light);
  padding: 2.8rem 0;
}

.about-explore__title {
  margin: 0 0 1.2rem;
  font-family: var(--font-heading);
  font-size: var(--size-title);
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--color-gold-light);
}

.about-explore__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.about-explore__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: rgba(245, 239, 230, 0.82);
  font-size: var(--size-sub);
  text-decoration: none;
  border-bottom: 1px solid rgba(224, 170, 78, 0.3);
  padding-bottom: 0.25rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.about-explore__list a::before {
  content: "→";
  color: var(--color-gold);
  font-family: var(--font-heading);
  font-size: 0.8rem;
  transition: transform 0.2s ease;
}

.about-explore__list a:hover,
.about-explore__list a:focus-visible {
  color: var(--color-gold-light);
  border-color: var(--color-gold);
}

.about-explore__list a:hover::before,
.about-explore__list a:focus-visible::before {
  transform: translateX(3px);
}

/* ————— 桌面断点 ————— */
@media (min-width: 760px) {
  .page-about .container {
    padding: 0 2rem;
  }

  .about-hero {
    padding: 4.5rem 0 3.5rem;
  }

  .about-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
    align-items: center;
    gap: 3rem;
  }

  .about-hero__visual {
    justify-content: flex-end;
  }

  .about-timeline {
    padding: calc(var(--space-section) + 0.6rem) 0 2.4rem;
  }

  .about-timeline__list {
    gap: 1.4rem;
  }

  .about-timeline__list::before {
    left: 8.4rem;
  }

  .about-timeline__entry {
    grid-template-columns: 8rem 1fr;
    gap: 1.6rem;
  }

  .about-timeline__year {
    width: auto;
    height: auto;
    background: transparent;
    border: 0;
    border-radius: 0;
    border-right: 2px solid var(--color-gold);
    margin: 0;
    padding: 0.5rem 0.85rem 0.5rem 0;
    justify-content: flex-end;
    font-size: var(--size-sub);
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--color-bg-dark);
  }

  .about-timeline__panel {
    padding: 1.1rem 1.3rem;
  }

  .about-timeline__badge {
    font-size: var(--size-tiny);
  }

  .about-data__layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
    align-items: center;
    gap: 3rem;
  }

  .about-security__grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.3rem;
  }

  .about-team__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
    align-items: center;
    gap: 3rem;
  }

  .about-users__layout {
    grid-template-columns: minmax(280px, 0.95fr) minmax(0, 1.05fr);
    gap: 3rem;
  }

  .about-users__stats {
    grid-template-columns: 1fr 1fr;
    align-content: start;
  }

  .about-explore__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.8rem 2rem;
  }
}

@media (min-width: 1100px) {
  .about-hero__inner {
    gap: 4.5rem;
  }

  .about-timeline__entry {
    grid-template-columns: 11rem 1fr;
    gap: 2.4rem;
  }

  .about-timeline__list::before {
    left: 11.4rem;
  }
}