/* ============ 品牌概况页 ============ */
.page-about {
  --about-card: rgba(22, 36, 31, .78);
  --about-card-deep: rgba(12, 22, 19, .88);
  --about-r-lg: 22px;
  --about-r-sm: 10px;
  display: block;
  padding-bottom: clamp(32px, 5vw, 72px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.4vw, 40px) 0 clamp(36px, 5.5vw, 76px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 78% at 88% -10%, rgba(92, 201, 138, .16), transparent 62%),
    radial-gradient(90% 70% at 6% 108%, rgba(53, 214, 232, .10), transparent 64%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
  }
}

.page-about .about-hero__copy .breadcrumb {
  margin-bottom: clamp(16px, 2vw, 26px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(29px, 4.4vw, 50px);
  line-height: 1.16;
  max-width: 17em;
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 36em;
  color: #CFDCD5;
}

.page-about .about-hero__badge {
  display: inline-block;
  margin: 22px 0 0;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(46, 125, 79, .14);
  color: var(--pitch-bright);
  font-size: 12px;
  letter-spacing: .1em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--about-r-lg) var(--about-r-sm) var(--about-r-lg) var(--about-r-sm);
  box-shadow: 0 34px 70px -46px rgba(0, 0, 0, .95);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  position: relative;
  padding: clamp(46px, 6.6vw, 92px) 0;
}

.page-about .section + .section {
  border-top: 1px solid var(--line-soft);
}

.page-about .section-head {
  margin-bottom: clamp(26px, 3.6vw, 46px);
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(44, 63, 56, .34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44, 63, 56, .34) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(88% 70% at 26% 42%, #000, transparent 74%);
  mask-image: radial-gradient(88% 70% at 26% 42%, #000, transparent 74%);
  pointer-events: none;
}

.page-about .about-origin > .wrap {
  position: relative;
}

.page-about .about-origin__body {
  align-items: start;
  row-gap: clamp(20px, 3vw, 36px);
}

.page-about .about-origin__lead p {
  margin: 0 0 18px;
  font-size: clamp(16px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: #D8E3DD;
  max-width: 40em;
}

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

.page-about .about-origin__note {
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-radius: 18px 8px 18px 8px;
  background: linear-gradient(150deg, var(--about-card), var(--about-card-deep));
}

.page-about .about-origin__note-title {
  margin: 0 0 16px;
  font-size: 17px;
  color: var(--warm);
}

.page-about .about-origin__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-origin__steps li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-origin__steps .mono {
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: .16em;
  flex: none;
}

/* ---------- 02 六类内容 ---------- */
.page-about .about-plates {
  display: grid;
  gap: clamp(12px, 1.6vw, 20px);
  grid-template-columns: repeat(auto-fit, minmax(228px, 1fr));
}

.page-about .about-plates .placard {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.2vw, 24px) clamp(16px, 2vw, 22px);
  border: 1px solid var(--line);
  border-radius: 22px 8px 22px 8px;
  background: linear-gradient(158deg, var(--about-card), var(--about-card-deep));
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-plates .placard:nth-child(3n + 2) {
  border-radius: 8px 22px 8px 22px;
}

.page-about .about-plates .placard:nth-child(3n) {
  border-radius: 20px 20px 8px 8px;
}

.page-about .about-plates .placard:hover {
  transform: translateY(-4px);
  border-color: var(--pitch-bright);
  box-shadow: 0 20px 42px -30px rgba(92, 201, 138, .9);
}

.page-about .about-plates .placard__no {
  align-self: flex-start;
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--pitch-bright);
}

.page-about .about-plates .placard__name {
  margin: 0;
  font-size: clamp(17px, 1.9vw, 19px);
  color: var(--warm);
}

.page-about .about-plates .placard__meta {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-topics__figure {
  margin: clamp(28px, 4vw, 52px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--about-r-lg);
  overflow: hidden;
}

.page-about .about-topics__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 03 内容小组 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(22px, 3.2vw, 44px);
}

@media (min-width: 940px) {
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    align-items: start;
  }
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px 26px 8px 26px;
  overflow: hidden;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .team-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(150deg, var(--about-card), var(--about-card-deep));
  overflow: hidden;
}

.page-about .team-card + .team-card {
  margin-top: 12px;
}

.page-about .team-card__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  color: var(--warm);
  font-size: 16px;
}

.page-about .team-card__sum::-webkit-details-marker {
  display: none;
}

.page-about .team-card__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
  flex: none;
}

.page-about .team-card[open] .team-card__sum::after {
  content: "\2013";
}

.page-about .team-card__hint {
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--muted);
  font-weight: 400;
}

.page-about .team-card__body {
  margin: 0 18px 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-soft);
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .team-card__body p {
  margin: 0 0 10px;
}

.page-about .team-card__body p:last-child {
  margin-bottom: 0;
}

.page-about .team-card__rhythm {
  color: var(--pitch-bright);
  font-size: 14px;
}

/* ---------- 04 版本演进 ---------- */
.page-about .chron-layout {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
}

@media (min-width: 900px) {
  .page-about .chron-layout {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }
}

.page-about .chron-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .chron-rail__list::-webkit-scrollbar {
  display: none;
}

@media (min-width: 900px) {
  .page-about .chron-rail {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
  }

  .page-about .chron-rail__list {
    flex-direction: column;
    gap: 14px;
    overflow: visible;
    padding: 0;
  }
}

.page-about .chron-rail__link {
  display: block;
  padding: 5px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.page-about .chron-rail__link:hover,
.page-about .chron-rail__link:focus-visible {
  color: var(--pitch-bright);
  border-color: var(--pitch);
  background: rgba(46, 125, 79, .16);
}

@media (min-width: 900px) {
  .page-about .chron-rail__link::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    margin-right: 8px;
    border-radius: 50%;
    background: var(--line);
    vertical-align: middle;
    transition: background var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
  }

  .page-about .chron-rail__link:hover::before,
  .page-about .chron-rail__link:focus-visible::before {
    background: var(--pitch-bright);
    box-shadow: 0 0 0 4px rgba(92, 201, 138, .18);
  }
}

.page-about .chron-track {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .chron-item {
  padding: clamp(18px, 2.4vw, 26px) clamp(18px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--pitch);
  border-radius: 20px 10px 20px 10px;
  background: linear-gradient(150deg, var(--about-card), var(--about-card-deep));
  transition: border-color var(--dur) var(--ease);
}

.page-about .chron-item:hover {
  border-left-color: var(--orange);
}

@media (min-width: 900px) {
  .page-about .chron-item:nth-child(odd) {
    margin-right: clamp(20px, 6vw, 88px);
  }

  .page-about .chron-item:nth-child(even) {
    margin-left: clamp(20px, 6vw, 88px);
  }
}

.page-about .chron-item__year {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid rgba(92, 201, 138, .5);
  border-radius: 999px;
  background: rgba(46, 125, 79, .16);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--pitch-bright);
}

.page-about .chron-item__title {
  margin: 14px 0 0;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--warm);
}

.page-about .chron-item__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 05 规模数字 ---------- */
.page-about .stat-grid {
  display: grid;
  gap: clamp(12px, 1.8vw, 20px);
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
}

.page-about .stat {
  padding: clamp(20px, 2.6vw, 28px) clamp(16px, 2vw, 22px);
  border: 1px solid var(--line);
  border-radius: 18px 8px 18px 8px;
  background: linear-gradient(160deg, rgba(22, 36, 31, .86), rgba(12, 22, 19, .9));
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 3.8vw, 42px);
  line-height: 1;
  color: var(--warm);
  font-variant-numeric: tabular-nums;
}

.page-about .stat__num--orange {
  color: var(--orange);
}

.page-about .stat__num--cyan {
  color: var(--cyan);
}

.page-about .stat__unit {
  font-size: .5em;
  margin-left: 2px;
}

.page-about .stat__label {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-scale__note {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 52em;
}

/* ---------- 06 来源与纠错 ---------- */
.page-about .about-source__body {
  row-gap: clamp(22px, 3vw, 38px);
  align-items: start;
}

.page-about .about-source__text p {
  margin: 0 0 16px;
  font-size: clamp(15.5px, 1.4vw, 17px);
  line-height: 1.85;
  color: #D8E3DD;
  max-width: 40em;
}

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

.page-about .about-fix {
  padding: clamp(22px, 2.8vw, 32px);
  border: 1px solid var(--line);
  border-radius: 8px 24px 8px 24px;
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(53, 214, 232, .12), transparent 60%),
    linear-gradient(150deg, var(--about-card), var(--about-card-deep));
}

.page-about .about-fix__title {
  margin: 0 0 14px;
  font-size: clamp(18px, 2vw, 21px);
  color: var(--warm);
}

.page-about .about-fix__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-fix__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-links {
  display: grid;
  gap: 10px;
  margin-top: clamp(34px, 4.6vw, 60px);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.page-about .about-links__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(22, 36, 31, .5);
  color: var(--warm);
  text-decoration: none;
  font-size: 15px;
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.page-about .about-links__item .mono {
  color: var(--cyan);
}

.page-about .about-links__item:hover,
.page-about .about-links__item:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 600px) {
  .page-about .about-plates {
    grid-template-columns: 1fr;
  }

  .page-about .about-links {
    grid-template-columns: 1fr;
  }

  .page-about .about-hero__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-plates .placard,
  .page-about .about-links__item,
  .page-about .chron-item {
    transition: none;
  }

  .page-about .about-plates .placard:hover,
  .page-about .about-links__item:hover {
    transform: none;
  }
}