.page-about {
  --about-line: var(--line);
  --about-fade: rgba(5, 20, 15, 0.94);
}

.page-about .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(34px, 6vw, 82px) 0 clamp(30px, 5vw, 62px);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  opacity: 0.3;
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 92% at 10% 0%, rgba(5, 20, 15, 0.32) 0%, var(--about-fade) 72%),
    repeating-linear-gradient(0deg, rgba(55, 240, 208, 0.05) 0 1px, transparent 1px 5px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(2rem, 5.4vw, 3.8rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--fog);
  text-shadow: 0 0 24px rgba(55, 240, 208, 0.18);
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--fog-88);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  margin: 28px 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  flex: 1 1 140px;
  min-width: 130px;
  background: var(--panel);
  padding: 13px 15px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-hero__k {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-hero__v {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4.5vw, 52px);
  padding-top: clamp(28px, 5vw, 58px);
  padding-bottom: clamp(38px, 6vw, 84px);
}

.page-about .about-index .vert-label {
  display: none;
}

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

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--muted);
  font-size: 0.82rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__list a:hover {
  color: var(--fog);
  border-color: var(--cyan-line);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.72rem;
  color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(32px, 5vw, 58px);
  padding-top: clamp(32px, 5vw, 58px);
  border-top: 1px solid var(--line);
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-sec__head::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  min-width: 24px;
  background: linear-gradient(90deg, var(--line), transparent);
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 3.2vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  text-shadow: 0 0 22px rgba(55, 240, 208, 0.26);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(1.28rem, 2.9vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-sec__lead {
  margin: 20px 0 0;
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--fog-88);
}

.page-about .about-sec__note {
  margin: 20px 0 0;
  max-width: 66ch;
  font-size: 0.92rem;
  line-height: 1.76;
  color: var(--muted);
  padding-left: 14px;
  border-left: 1px solid var(--cyan-line);
}

.page-about .about-sec__linkline {
  margin: 22px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
}

.page-about .about-sec__linkline a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-line);
  padding-bottom: 2px;
}

.page-about .about-sec__linkline a:hover {
  color: var(--yellow);
  border-bottom-color: var(--yellow-line);
}

.page-about .about-sec__linkline span {
  color: var(--line);
}

/* ---------- 01 四个方向 ---------- */
.page-about .about-pillars {
  margin: 24px 0 0;
  padding: 1px;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-pillar {
  background: var(--panel);
  padding: 16px 18px;
  display: grid;
  gap: 7px;
}

.page-about .about-pillar__k {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-pillar__v {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.74;
  color: var(--fog-88);
}

/* ---------- 02 时间线 ---------- */
.page-about .about-road__frame {
  margin-top: 22px;
}

.page-about .about-road__frame img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  opacity: 0.72;
}

.page-about .about-tl {
  margin: 26px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .about-tl__item {
  position: relative;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 19px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(55, 240, 208, 0.12), 0 0 14px rgba(55, 240, 208, 0.55);
}

.page-about .about-tl__btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
  cursor: pointer;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  color: var(--fog);
  font-family: inherit;
  padding: 14px 10px;
  transition: background 0.2s var(--ease);
}

.page-about .about-tl__btn:hover {
  background: var(--panel);
}

.page-about .about-tl__btn::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--muted);
}

.page-about .about-tl__btn[aria-expanded="true"]::after {
  content: "−";
  color: var(--cyan);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.06em;
  color: var(--orange);
  flex: 0 0 auto;
}

.page-about .about-tl__label {
  font-size: 0.96rem;
  line-height: 1.5;
  color: var(--fog-88);
}

.page-about .about-tl__inner {
  padding: 4px 10px 16px;
}

.page-about .about-tl__inner p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.93rem;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  margin-top: 24px;
  display: grid;
  gap: 1px;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-team__stat {
  background: var(--panel-2);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.8rem, 7vw, 4.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  text-shadow: 0 0 26px rgba(55, 240, 208, 0.24);
}

.page-about .about-team__unit {
  font-size: 0.82rem;
  letter-spacing: 0.3em;
  color: var(--muted);
  margin-top: 8px;
}

.page-about .about-team__cap {
  margin: 14px 0 0;
  font-size: 0.84rem;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .about-team__text {
  background: var(--panel);
  padding: 20px;
}

.page-about .about-team__text p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--fog-88);
}

.page-about .about-team__text p + p {
  margin-top: 12px;
}

.page-about .about-desk__frame {
  margin-top: 24px;
}

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

.page-about .about-columns {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-columns__item {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 16px 18px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-columns__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.74;
  color: var(--fog-88);
}

/* ---------- 04 覆盖 ---------- */
.page-about .about-stats {
  margin: 24px 0 0;
  padding: 1px;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats li {
  background: var(--panel);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.24rem, 2.7vw, 1.7rem);
  letter-spacing: 0.02em;
  color: var(--fog);
}

.page-about .about-stats__label {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 16px;
}

.page-about .about-switch__btn {
  appearance: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-family: inherit;
  font-size: 0.84rem;
  padding: 8px 14px;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-switch__btn:hover {
  color: var(--fog);
  border-color: var(--cyan-line);
}

.page-about .about-switch__btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-cats {
  margin: 0;
  padding: 1px;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-cats__item {
  background: var(--panel);
  padding: 16px 18px;
}

.page-about .about-cats__item[hidden] {
  display: none;
}

.page-about .about-cats__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-cats__item p {
  margin: 8px 0 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--fog-88);
}

/* ---------- 05 发布流程 ---------- */
.page-about .about-flow {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-flow__item {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 22px 18px 18px;
}

.page-about .about-flow__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  color: var(--orange);
}

.page-about .about-flow__title {
  margin: 10px 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-flow__item p {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.74;
  color: var(--fog-88);
}

/* ---------- 06 合作展签 ---------- */
.page-about .about-plates {
  margin: 26px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-plates__item {
  border-bottom: 1px solid var(--line);
}

.page-about .about-plates__btn {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 16px;
  text-align: left;
  cursor: pointer;
  background: transparent;
  border: 0;
  color: var(--fog);
  font-family: inherit;
  padding: 16px 6px;
  transition: background 0.2s var(--ease);
}

.page-about .about-plates__btn:hover {
  background: var(--panel);
}

.page-about .about-plates__btn::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--muted);
  flex: 0 0 auto;
}

.page-about .about-plates__btn[aria-expanded="true"]::after {
  content: "−";
  color: var(--yellow);
}

.page-about .about-plates__k {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.06em;
  color: var(--yellow);
}

.page-about .about-plates__t {
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--fog-88);
}

.page-about .about-plates__inner {
  padding: 0 6px 18px;
}

.page-about .about-plates__inner p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.92rem;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 07 地域 ---------- */
.page-about .about-region__bar {
  height: 2px;
  margin: 24px 0 0;
  background: linear-gradient(
    90deg,
    var(--orange) 0%,
    rgba(255, 122, 69, 0.16) 36%,
    rgba(55, 240, 208, 0.16) 64%,
    var(--cyan) 100%
  );
}

.page-about .about-region__bar + .about-sec__lead {
  margin-top: 22px;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: clamp(36px, 6vw, 64px);
  padding: clamp(24px, 4vw, 40px) clamp(18px, 3vw, 34px);
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(55, 240, 208, 0.07) 0%, rgba(5, 20, 15, 0) 46%),
    var(--panel-2);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--fog-88);
}

.page-about .about-cta__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__mini {
  margin: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.86rem;
}

.page-about .about-cta__mini a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
}

.page-about .about-cta__mini a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan-line);
}

.page-about .about-cta__mini span {
  color: var(--line);
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .about-cats {
    grid-template-columns: 1fr 1fr;
  }

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

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

  .page-about .about-pillar {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
    padding: 18px 20px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 186px minmax(0, 1fr);
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-index .vert-label {
    display: block;
    margin: 0 0 14px;
    font-size: 0.68rem;
    letter-spacing: 0.34em;
    color: var(--muted);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list a {
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
    padding: 9px 12px;
    font-size: 0.84rem;
  }

  .page-about .about-index__list a:hover {
    border-left-color: var(--cyan);
    color: var(--fog);
  }

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

  .page-about .about-team {
    grid-template-columns: 0.85fr 1.5fr;
  }

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

  .page-about .about-hero h1 {
    max-width: 20ch;
  }
}

@media (min-width: 1200px) {
  .page-about .about-cats {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__btn,
  .page-about .about-plates__btn,
  .page-about .about-switch__btn,
  .page-about .about-index__list a {
    transition: none;
  }
}