/* ===================== page-about ===================== */
.page-about {
  --about-rule: 1px solid var(--line);
  background: var(--page-bg);
}

/* ---------- 面包屑（深色底适配） ---------- */
.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 48px);
}
.page-about .about-hero .breadcrumb a {
  color: var(--on-dark-soft);
}
.page-about .about-hero .breadcrumb li {
  color: var(--on-dark-faint);
}
.page-about .about-hero .breadcrumb [aria-current="page"] {
  color: var(--cyan);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4.5vw, 52px) 0 clamp(44px, 7vw, 92px);
  background:
    radial-gradient(115% 85% at 6% -12%, rgba(0, 229, 255, 0.17), transparent 58%),
    radial-gradient(90% 70% at 100% 4%, rgba(255, 184, 0, 0.1), transparent 55%),
    linear-gradient(165deg, var(--navy-deep) 0%, var(--navy) 48%, var(--navy-2) 100%);
  color: var(--on-dark);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 84%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 84%);
  pointer-events: none;
}
.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}
.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-size: clamp(29px, 5.1vw, 50px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--white);
}
.page-about .about-hero__text {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--on-dark-soft);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(24px, 3.5vw, 34px);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.page-about .about-stat {
  position: relative;
  padding: 18px 16px 16px;
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.05);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.page-about .about-stat:hover {
  border-color: var(--line-cyan);
  transform: translateY(-3px);
}
.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(25px, 3.6vw, 33px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}
.page-about .about-stat:nth-child(2) .about-stat__num,
.page-about .about-stat:nth-child(4) .about-stat__num {
  color: var(--gold);
}
.page-about .about-stat__unit {
  font-size: 0.46em;
  margin-left: 2px;
  letter-spacing: 0;
}
.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--on-dark-soft);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  background: var(--page-bg);
}
.page-about .about-history__split {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(28px, 4vw, 46px);
  align-items: start;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line-strong);
}
.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 12px 15px 20px;
  border-radius: 0 var(--r-md) var(--r-md) 0;
  outline: none;
  transition: background 0.25s ease;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--panel-bg);
  border: 2px solid var(--cyan-deep);
  transition: border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}
.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  background: rgba(0, 229, 255, 0.06);
}
.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.16);
}
.page-about .about-timeline__year {
  padding-top: 2px;
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan-deep);
  letter-spacing: 0.05em;
}
.page-about .about-timeline__title {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--ink-strong);
}
.page-about .about-timeline__detail {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.36s ease, opacity 0.3s ease, margin-top 0.3s ease;
}
.page-about .about-timeline__item:hover .about-timeline__detail,
.page-about .about-timeline__item:focus-within .about-timeline__detail {
  max-height: 200px;
  opacity: 1;
  margin-top: 9px;
}
.page-about .about-timeline__detail p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-soft);
}
@media (hover: none) {
  .page-about .about-timeline__detail {
    max-height: none;
    opacity: 1;
    margin-top: 9px;
  }
}

.page-about .about-history__figure {
  margin: 0;
}

/* ---------- 编号规则（深色） ---------- */
.page-about .about-code {
  background:
    radial-gradient(90% 70% at 92% 0%, rgba(255, 46, 147, 0.12), transparent 58%),
    linear-gradient(150deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: var(--on-dark);
}
.page-about .about-code__kicker {
  color: var(--gold);
}
.page-about .about-code .section-title {
  color: var(--white);
}
.page-about .about-code .section-desc {
  color: var(--on-dark-soft);
}

.page-about .about-code__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
}
.page-about .about-code__card {
  border: 1px solid var(--line-dark);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.04);
  overflow: hidden;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.page-about .about-code__card:hover {
  border-color: var(--line-cyan);
}
.page-about .about-code__card[open] {
  background: rgba(0, 229, 255, 0.07);
  border-color: var(--line-cyan);
}
.page-about .about-code__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 20px 18px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-code__head::-webkit-details-marker {
  display: none;
}
.page-about .about-code__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
  transition: transform 0.25s ease;
}
.page-about .about-code__card[open] .about-code__head::after {
  transform: rotate(45deg);
}
.page-about .about-code__index {
  font-size: 12px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.08em;
}
.page-about .about-code__label {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-code__value {
  font-size: 13px;
  color: var(--on-dark-soft);
}
.page-about .about-code__body {
  padding: 0 18px 20px;
  border-top: 1px solid var(--line-dark);
  padding-top: 15px;
  margin: 0 18px 0;
  padding-left: 0;
  padding-right: 0;
}
.page-about .about-code__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--on-dark-soft);
}

.page-about .about-code__figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

/* ---------- 服务范围 ---------- */
.page-about .about-coverage {
  background: var(--panel-bg);
}
.page-about .about-coverage__split {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(28px, 4vw, 46px);
  align-items: start;
}
.page-about .about-coverage__figure {
  margin: 0;
}

.page-about .about-coverage__panel {
  padding: clamp(22px, 3vw, 30px);
  border: var(--about-rule);
  border-radius: var(--r-lg);
  background: var(--page-bg);
  border-top: 3px solid var(--cyan);
}
.page-about .about-coverage__title {
  margin: 0 0 12px;
  font-size: clamp(19px, 2.4vw, 22px);
  font-weight: 700;
  color: var(--ink-strong);
}
.page-about .about-coverage__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-region-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(132px, 1fr));
  gap: 8px;
}
.page-about .about-region {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--panel-bg);
  transition: border-color 0.22s ease, background 0.22s ease, transform 0.22s ease;
}
.page-about .about-region:hover {
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.09);
  transform: translateY(-2px);
}
.page-about .about-region__name {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-strong);
}
.page-about .about-region__tag {
  font-size: 12px;
  color: var(--ink-faint);
}

/* ---------- 行业认可 ---------- */
.page-about .about-honor {
  background: var(--mist);
}
.page-about .about-honor__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(22px, 3.5vw, 38px);
  align-items: center;
}
.page-about .about-honor__year-block {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, var(--navy) 0%, var(--navy-2) 100%);
  border-bottom: 4px solid var(--gold);
  color: var(--on-dark);
}
.page-about .about-honor__year {
  font-size: clamp(46px, 8vw, 78px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
}
.page-about .about-honor__year-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--on-dark-soft);
}
.page-about .about-honor__title {
  margin: 0 0 14px;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--ink-strong);
}
.page-about .about-honor__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.page-about .about-honor__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 持续运营 ---------- */
.page-about .about-ops {
  background: var(--panel-bg);
}
.page-about .about-ops__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
}
.page-about .about-ops__card {
  padding: 22px 18px;
  border: var(--about-rule);
  border-top: 3px solid var(--cyan-deep);
  border-radius: var(--r-md);
  background: var(--page-bg);
  transition: transform 0.25s ease, border-top-color 0.25s ease;
}
.page-about .about-ops__card:hover {
  transform: translateY(-4px);
  border-top-color: var(--gold);
}
.page-about .about-ops__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--navy);
}
.page-about .about-ops__unit {
  font-size: 0.48em;
  margin-left: 2px;
}
.page-about .about-ops__label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-strong);
}
.page-about .about-ops__note {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  background: var(--page-bg);
}
.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
  padding: clamp(26px, 4.5vw, 46px);
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-xl);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(0, 229, 255, 0.14), transparent 60%),
    linear-gradient(140deg, var(--navy-deep) 0%, var(--navy-2) 100%);
  color: var(--on-dark);
}
.page-about .about-cta__kicker {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--gold);
}
.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.9vw, 28px);
  line-height: 1.32;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--on-dark-soft);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-code__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-honor__inner {
    grid-template-columns: minmax(0, 0.66fr) minmax(0, 1.34fr);
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
  }
  .page-about .about-history__split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
  .page-about .about-coverage__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.94fr);
  }
}

@media (min-width: 1180px) {
  .page-about .about-timeline__item {
    grid-template-columns: 62px minmax(0, 1fr);
  }
}