.page-about {
  --about-rail-w: 168px;
}

.page-about .about-opening {
  padding-top: var(--gap-2);
}

.page-about .about-opening__panel {
  position: relative;
  margin-top: var(--gap-3);
  padding: clamp(24px, 3.4vw, 48px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(201, 162, 39, 0.16), rgba(201, 162, 39, 0) 58%),
    radial-gradient(110% 120% at 0% 100%, rgba(30, 92, 143, 0.13), rgba(30, 92, 143, 0) 62%),
    rgba(255, 255, 255, 0.74);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-about .about-opening__panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(169, 196, 220, 0.4) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(169, 196, 220, 0.4) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 78%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 78%);
  pointer-events: none;
}

.page-about .about-opening__panel > * {
  position: relative;
}

.page-about .about-opening__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-2);
}

.page-about .about-opening h1 {
  margin: var(--gap-3) 0 var(--gap-3);
  max-width: 17ch;
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--sea-900);
}

.page-about .about-opening .lead {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-opening__facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-3);
  margin: var(--gap-4) 0 0;
  padding-top: var(--gap-3);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-fact dt {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--sea-500);
}

.page-about .about-fact dd {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-opening__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-2);
  margin-top: var(--gap-4);
}

/* ---- 主体布局 ---- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-4);
  margin-top: var(--gap-5);
  min-width: 0;
}

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

/* ---- 章节索引 ---- */

.page-about .about-toc__title {
  margin: 0 0 var(--gap-2);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.page-about .about-toc__list {
  display: flex;
  gap: var(--gap-2);
  margin: 0;
  padding: 0 0 var(--gap-1);
  list-style: none;
  overflow-x: auto;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: var(--white);
  color: var(--sea-700);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  border-color: var(--gold);
  background: rgba(201, 162, 39, 0.1);
  color: var(--sea-900);
}

.page-about .about-toc__num {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

/* ---- 章节通用 ---- */

.page-about .about-chapter {
  margin-top: var(--gap-5);
  scroll-margin-top: 96px;
}

.page-about .about-chapter:first-child {
  margin-top: 0;
}

.page-about .about-chapter h2 {
  margin: var(--gap-3) 0 var(--gap-2);
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--sea-900);
}

.page-about .about-chapter__lead {
  max-width: 62ch;
  margin: 0 0 var(--gap-3);
  color: var(--slate);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-4);
  align-items: start;
  margin-top: var(--gap-3);
}

.page-about .about-chapter__text .t-body {
  margin: 0;
}

.page-about .about-chapter__text .t-body + .t-body {
  margin-top: var(--gap-2);
}

/* ---- 图片容器 ---- */

.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: linear-gradient(150deg, var(--paper), #e6edf5);
}

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

.page-about .about-figure--wide {
  margin-top: var(--gap-3);
}

/* ---- 四格索引卡 ---- */

.page-about .about-tiles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-2);
  margin: var(--gap-3) 0 var(--gap-4);
}

.page-about .about-tile {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: var(--gap-3);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--white);
  color: inherit;
  text-decoration: none;
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .about-tile:hover,
.page-about .about-tile:focus-visible {
  transform: translateY(-3px);
  border-color: var(--gold);
  box-shadow: var(--shadow-card);
}

.page-about .about-tile__num {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-tile__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--sea-900);
}

.page-about .about-tile__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---- 品牌资料说明 ---- */

.page-about .about-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-3);
}

.page-about .about-note {
  padding: var(--gap-3);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--white);
  scroll-margin-top: 96px;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-note:target {
  border-color: var(--gold);
  background: rgba(201, 162, 39, 0.07);
}

.page-about .about-note h3 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--sea-900);
}

.page-about .about-note .t-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--slate);
}

/* ---- 时间线 ---- */

.page-about .about-timeline {
  margin-top: var(--gap-3);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-timeline .acc__item {
  position: relative;
  padding-left: 28px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-timeline .acc__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line);
}

.page-about .about-timeline .acc__item:first-child::before {
  background: var(--gold);
}

.page-about .about-timeline .acc__item::after {
  content: "";
  position: absolute;
  left: 9px;
  top: 38px;
  bottom: 0;
  width: 1px;
  background: var(--line-soft);
}

.page-about .about-timeline .acc__item:last-child::after {
  display: none;
}

.page-about .about-timeline .acc__trigger {
  display: flex;
  align-items: center;
  gap: var(--gap-2);
  width: 100%;
  padding: var(--gap-2) 0;
  text-align: left;
}

.page-about .about-timeline .acc__code {
  min-width: 4.6em;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-timeline .acc__label {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--sea-900);
}

.page-about .about-timeline .acc__inner {
  padding: 0 0 var(--gap-3);
}

.page-about .about-timeline .acc__inner .t-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---- 团队深色区块 ---- */

.page-about .about-chapter--dark {
  padding: clamp(24px, 4vw, 48px);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 130% at 88% 0%, rgba(30, 92, 143, 0.85), rgba(11, 37, 69, 0) 62%),
    var(--sea-900);
  color: var(--on-dark);
}

.page-about .about-chapter--dark h2 {
  color: #ffffff;
}

.page-about .about-chapter--dark .t-body {
  color: rgba(232, 237, 243, 0.86);
}

.page-about .about-chapter--dark .rule__num,
.page-about .about-chapter--dark .rule__label {
  color: var(--gold-soft);
}

.page-about .about-team {
  margin-top: var(--gap-4);
}

.page-about .about-bars {
  display: flex;
  gap: 6px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 15px 14px;
  border-radius: 8px;
  min-width: 0;
  color: var(--sea-900);
  transition: filter 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-bar--dev { flex: 41 1 0; background: rgba(201, 162, 39, 0.9); }
.page-about .about-bar--ct { flex: 19 1 0; background: rgba(95, 199, 169, 0.9); }
.page-about .about-bar--ds { flex: 8 1 0; background: rgba(242, 153, 74, 0.9); }

.page-about .about-bar:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
}

.page-about .about-bar__name {
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-bar__val {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-team__notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-3);
  margin-top: var(--gap-4);
}

.page-about .about-team__notes .t-body {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
}

/* ---- 原则三卡 ---- */

.page-about .about-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap-3);
  margin: var(--gap-3) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  padding: var(--gap-3);
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--gold);
  border-radius: var(--radius);
  background: var(--white);
}

.page-about .about-principle:nth-child(2) { border-top-color: var(--mint); }
.page-about .about-principle:nth-child(3) { border-top-color: var(--amber); }

.page-about .about-principle__num {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-principle h3 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.5;
  color: var(--sea-900);
}

.page-about .about-principle .t-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--slate);
}

/* ---- 合作 ---- */

.page-about .about-partners {
  margin-top: var(--gap-3);
  max-width: 70ch;
}

.page-about .about-partners .t-body {
  margin: 0 0 var(--gap-2);
  color: var(--slate);
}

.page-about .about-partners__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-2);
  margin-top: var(--gap-3);
}

/* ---- 收尾 ---- */

.page-about .about-next {
  margin-top: var(--gap-5);
}

.page-about .about-next__panel {
  padding: clamp(24px, 3.4vw, 44px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(110% 130% at 0% 0%, rgba(95, 199, 169, 0.16), rgba(95, 199, 169, 0) 58%),
    radial-gradient(100% 120% at 100% 100%, rgba(201, 162, 39, 0.14), rgba(201, 162, 39, 0) 62%),
    rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.page-about .about-next__panel h2 {
  margin: var(--gap-2) 0 var(--gap-2);
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1.34;
  color: var(--sea-900);
}

.page-about .about-next__panel .t-body {
  margin: 0;
  max-width: 62ch;
  color: var(--slate);
}

/* ---- 响应式 ---- */

@media (min-width: 640px) {
  .page-about .about-opening__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 620px) {
  .page-about .about-tiles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-tiles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--gap-5);
    align-items: start;
  }
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--rail-top-h) + var(--gap-3));
  }
  .page-about .about-toc__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }
  .page-about .about-toc__link {
    display: flex;
    position: relative;
    padding: 11px 0 11px 16px;
    border: 0;
    border-radius: 0;
    background: none;
  }
  .page-about .about-toc__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    width: 2px;
    height: 0;
    background: var(--gold);
    transform: translateY(-50%);
    transition: height 0.24s var(--ease);
  }
  .page-about .about-toc__link:hover::before,
  .page-about .about-toc__link:focus-visible::before {
    height: 62%;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
  .page-about .about-chapter__grid--media-left {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }
  .page-about .about-chapter__grid--media-left .about-figure {
    position: sticky;
    top: calc(var(--rail-top-h) + var(--gap-3));
  }
  .page-about .about-team__notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--gap-4);
  }
}

@media (min-width: 860px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 719px) {
  .page-about .about-bars {
    flex-direction: column;
  }
  .page-about .about-bar {
    flex: 0 0 auto;
    width: 100%;
  }
}

@media (max-width: 639px) {
  .page-about .about-opening h1 {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tile,
  .page-about .about-bar,
  .page-about .about-note,
  .page-about .about-toc__link,
  .page-about .about-toc__link::before {
    transition: none;
  }
  .page-about .about-tile:hover,
  .page-about .about-bar:hover {
    transform: none;
  }
}