.page-about {
  --about-hair: rgba(79, 216, 232, 0.16);
  --about-hair-soft: rgba(79, 216, 232, 0.07);
  position: relative;
  overflow-x: clip;
  color: var(--fog);
}

.page-about [data-filter-item][hidden] {
  display: none !important;
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: clamp(16px, 2.6vw, 28px);
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.page-about .crumbs li {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.page-about .crumbs li + li::before {
  content: "/";
  color: var(--teal);
}

.page-about .crumbs a {
  color: var(--slate);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .crumbs a:hover {
  color: var(--ice);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--ice-soft);
}

/* 通用标题尺度 */
.page-about .display--l {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5.2vw, 3.2rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 0.3em 0 0.45em;
}

.page-about .display--m {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4vw, 2.4rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.008em;
  margin: 0.32em 0 0.5em;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 54px) 0 clamp(38px, 7vw, 86px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -18%;
  width: min(62vw, 720px);
  height: min(62vw, 720px);
  background: radial-gradient(circle at 50% 50%, rgba(79, 216, 232, 0.16), rgba(79, 216, 232, 0) 62%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 5vw, 48px);
  align-items: start;
}

.page-about .about-hero-text {
  position: relative;
}

.page-about .about-hero-text h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 8.2vw, 5rem);
  font-weight: 900;
  line-height: 0.99;
  letter-spacing: -0.018em;
  margin: 0.28em 0 0.42em;
  color: var(--fog);
}

.page-about .about-hero-text h1 .hl {
  color: var(--ice);
  position: relative;
  display: inline-block;
}

.page-about .about-hero-text h1 .hl::after {
  content: "";
  position: absolute;
  left: 2%;
  right: 2%;
  bottom: 0.06em;
  height: 0.12em;
  background: linear-gradient(90deg, var(--amber), rgba(242, 181, 68, 0));
  z-index: -1;
}

.page-about .about-hero-text .lede {
  max-width: 34em;
  margin: 0;
  color: var(--slate);
  font-size: clamp(0.96rem, 1.7vw, 1.08rem);
  line-height: 1.85;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 3vw, 24px);
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding-top: clamp(18px, 3vw, 24px);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-stats .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 4vw, 2.05rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-stats .stat-label {
  display: block;
  margin-top: 0.55em;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-hero-fig {
  position: relative;
  margin: 0;
  aspect-ratio: 4 / 3;
  background: var(--ink-800);
}

.page-about .about-hero-fig img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 88%);
}

.page-about .about-hero-fig .media-note {
  position: absolute;
  left: 6%;
  right: 6%;
  bottom: 16%;
  margin: 0;
  font-size: 0.72rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--fog);
  opacity: 0.85;
}

.page-about .note-rot {
  display: none;
}

/* 冰城起点 */
.page-about .about-origin {
  position: relative;
  padding: clamp(38px, 7vw, 82px) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-origin-grid {
  display: grid;
  gap: clamp(18px, 4vw, 36px);
  align-items: start;
}

.page-about .origin-year {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--amber);
}

.page-about .origin-num {
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 9vw, 4.2rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: rgba(242, 181, 68, 0.18);
  -webkit-text-stroke: 1px var(--amber);
}

.page-about .origin-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  color: var(--amber);
  writing-mode: vertical-rl;
}

.page-about .origin-copy h2 {
  color: var(--fog);
}

.page-about .origin-copy p {
  margin: 0 0 1em;
  max-width: 40em;
  color: var(--slate);
  line-height: 1.85;
  font-size: clamp(0.94rem, 1.6vw, 1rem);
}

.page-about .origin-copy .origin-quote {
  margin: 1.5em 0 0;
  padding-left: 0.9em;
  border-left: 3px solid var(--ice);
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.6vw, 1.42rem);
  font-weight: 800;
  line-height: 1.4;
  color: var(--ice-soft);
}

/* 版本时间轴 */
.page-about .about-timeline {
  padding: clamp(42px, 8vw, 94px) 0;
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
  background: linear-gradient(180deg,
    rgba(17, 28, 51, 0) 0%,
    rgba(17, 28, 51, 0.68) 20%,
    rgba(17, 28, 51, 0.68) 80%,
    rgba(17, 28, 51, 0) 100%);
}

.page-about .about-section-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .about-section-head .lede {
  margin: 0;
  color: var(--slate);
  line-height: 1.8;
  font-size: clamp(0.94rem, 1.6vw, 1rem);
}

.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(24px, 4vw, 36px);
}

.page-about .filter-btn {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  padding: 0.52em 0.95em;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  background: transparent;
  color: var(--slate);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .filter-btn:hover {
  color: var(--fog);
  border-color: var(--ice-soft);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--ice);
  border-color: var(--ice);
  color: var(--ink-900);
  font-weight: 700;
}

.page-about .tl-grid {
  display: grid;
  gap: clamp(28px, 5vw, 44px);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 36px;
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg,
    var(--ice) 0%,
    rgba(79, 216, 232, 0.34) 55%,
    rgba(79, 216, 232, 0.05) 100%);
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 7px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--ice);
  background: var(--ink-900);
  box-shadow: 0 0 0 5px rgba(79, 216, 232, 0.07);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--ice);
  box-shadow: 0 0 0 7px rgba(79, 216, 232, 0.16);
}

.page-about .tl-ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 3vw, 1.3rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--ice);
}

.page-about .tl-stage {
  margin: 0.4em 0 0.45em;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.1em;
  color: var(--magenta);
}

.page-about .tl-title {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3.4vw, 1.72rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--fog);
  transition: color 0.2s var(--ease);
}

.page-about .tl-item:hover .tl-title {
  color: var(--ice-soft);
}

.page-about .tl-desc {
  margin: 0;
  color: var(--slate);
  line-height: 1.8;
  font-size: clamp(0.92rem, 1.6vw, 0.98rem);
}

.page-about .tl-fig {
  margin: 0;
  position: relative;
}

.page-about .tl-fig img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
}

.page-about .tl-fig .media-note {
  position: static;
  display: block;
  margin: 0.8em 0 0;
  font-size: 0.74rem;
  line-height: 1.6;
  color: var(--slate);
}

/* 产品面 */
.page-about .about-capabilities {
  padding: clamp(42px, 8vw, 94px) 0;
}

.page-about .about-section-head--split {
  max-width: none;
  display: grid;
  gap: clamp(14px, 3vw, 28px);
}

.page-about .caps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .cap {
  display: grid;
  gap: 0.45rem;
  padding: clamp(18px, 3vw, 26px) clamp(8px, 1.8vw, 16px);
  border-bottom: 1px solid var(--about-hair);
  transition: background 0.22s var(--ease);
}

.page-about .cap:hover {
  background: rgba(79, 216, 232, 0.055);
}

.page-about .cap-idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--amber);
}

.page-about .cap h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.18rem, 3vw, 1.58rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--fog);
  transition: color 0.2s var(--ease);
}

.page-about .cap:hover h3 {
  color: var(--ice);
}

.page-about .cap p {
  margin: 0;
  color: var(--slate);
  line-height: 1.8;
  font-size: clamp(0.9rem, 1.6vw, 0.96rem);
}

/* 团队 */
.page-about .about-team {
  padding: clamp(42px, 8vw, 94px) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-team-grid {
  display: grid;
  gap: clamp(26px, 5vw, 46px);
  align-items: start;
}

.page-about .about-team-grid h2 {
  color: var(--fog);
}

.page-about .team-lede {
  margin: 0;
  max-width: 38em;
  color: var(--slate);
  line-height: 1.85;
  font-size: clamp(0.93rem, 1.6vw, 1rem);
}

.page-about .team-bars {
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .team-row {
  display: grid;
  gap: 0.5rem;
}

.page-about .team-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--fog);
}

.page-about .team-head b {
  font-weight: 600;
}

.page-about .team-head span {
  color: var(--slate);
  font-size: 0.74rem;
}

.page-about .team-track {
  height: 7px;
  border-radius: 99px;
  background: rgba(79, 216, 232, 0.1);
  overflow: hidden;
}

.page-about .team-fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  border-radius: 99px;
  background: linear-gradient(90deg, var(--ice), var(--ice-soft));
  transition: width 0.5s var(--ease);
}

.page-about .team-row:nth-child(2) .team-fill {
  background: linear-gradient(90deg, var(--amber), #f7cf82);
}

.page-about .team-row:nth-child(3) .team-fill {
  background: linear-gradient(90deg, var(--grass), #8ee0a4);
}

.page-about .team-row:nth-child(4) .team-fill {
  background: linear-gradient(90deg, var(--magenta), #e88ab3);
}

.page-about .team-fig {
  margin: 0;
}

.page-about .team-fig img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 90%);
}

.page-about .team-fig .media-note {
  position: static;
  display: block;
  margin: 0.8em 0 0;
  font-size: 0.74rem;
  line-height: 1.6;
  color: var(--slate);
}

/* 服务与协作 */
.page-about .about-ecosystem {
  padding: clamp(42px, 8vw, 94px) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .eco-grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .eco-lead h2 {
  color: var(--fog);
}

.page-about .eco-lead p {
  margin: 0 0 1em;
  max-width: 36em;
  color: var(--slate);
  line-height: 1.85;
  font-size: clamp(0.93rem, 1.6vw, 1rem);
}

.page-about .eco-link {
  margin-top: 1.4em;
}

.page-about .eco-link a {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 216, 232, 0.4);
  padding-bottom: 3px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .eco-link a:hover {
  color: var(--amber);
  border-color: var(--amber);
}

.page-about .eco-facts {
  border-top: 1px solid var(--about-hair);
}

.page-about .eco-fact {
  display: flex;
  align-items: baseline;
  gap: clamp(14px, 3vw, 26px);
  padding: clamp(16px, 2.6vw, 22px) 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .eco-num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ice);
  min-width: 2.6em;
}

.page-about .eco-fact p {
  margin: 0;
  color: var(--slate);
  line-height: 1.7;
  font-size: 0.9rem;
}

/* 品牌原则 */
.page-about .about-principles {
  padding: clamp(42px, 8vw, 94px) 0;
  border-top: 1px solid var(--about-hair);
  background: linear-gradient(180deg, rgba(17, 28, 51, 0.7), rgba(11, 18, 32, 0));
}

.page-about .about-principles h2 {
  color: var(--fog);
}

.page-about .principles {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .principle {
  padding-top: 1.1rem;
  border-top: 2px solid rgba(79, 216, 232, 0.3);
}

.page-about .principle:nth-child(2) {
  border-top-color: rgba(242, 181, 68, 0.52);
}

.page-about .principle:nth-child(3) {
  border-top-color: rgba(217, 79, 138, 0.48);
}

.page-about .p-idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .principle h3 {
  margin: 0.4em 0 0.35em;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 4vw, 1.95rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--fog);
}

.page-about .principle p {
  margin: 0;
  color: var(--slate);
  line-height: 1.8;
  font-size: 0.92rem;
}

/* 结尾动线 */
.page-about .about-next {
  padding: clamp(42px, 8vw, 94px) 0 clamp(36px, 6vw, 64px);
}

.page-about .about-next h2 {
  color: var(--fog);
}

.page-about .next-links {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .next-links li {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .next-links a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.35rem 1rem;
  padding: clamp(16px, 2.6vw, 22px) clamp(6px, 1.4vw, 14px);
  text-decoration: none;
  color: var(--fog);
  transition: background 0.22s var(--ease);
}

.page-about .next-links a:hover {
  background: rgba(79, 216, 232, 0.06);
}

.page-about .nl-k {
  font-family: var(--font-display);
  font-size: clamp(1.12rem, 3vw, 1.42rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--ice);
  grid-row: 1;
}

.page-about .nl-d {
  grid-column: 1 / -1;
  grid-row: 2;
  color: var(--slate);
  font-size: 0.88rem;
  line-height: 1.65;
}

.page-about .nl-ar {
  grid-row: 1;
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--amber);
  transition: transform 0.2s var(--ease);
}

.page-about .next-links a:hover .nl-ar {
  transform: translateX(5px);
}

.page-about .back-top {
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .back-top a {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
  padding-bottom: 2px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .back-top a:hover {
  color: var(--ice);
  border-color: var(--ice);
}

/* 断点 */
@media (min-width: 640px) {
  .page-about .about-hero-fig {
    aspect-ratio: 4 / 5;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .next-links a {
    grid-template-columns: minmax(0, 0.34fr) minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .nl-d {
    grid-column: auto;
    grid-row: 1;
  }
}

@media (min-width: 760px) {
  .page-about .cap {
    grid-template-columns: 56px minmax(0, 0.62fr) minmax(0, 1.38fr);
    align-items: baseline;
    gap: 0.45rem 1.2rem;
  }

  .page-about .cap-idx {
    grid-row: 1;
  }

  .page-about .cap h3 {
    grid-row: 1;
  }

  .page-about .cap p {
    grid-row: 1;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(34px, 4.5vw, 68px);
    align-items: end;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: clamp(26px, 5vw, 72px);
  }

  .page-about .about-section-head--split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: clamp(24px, 5vw, 60px);
  }

  .page-about .about-section-head--split .lede {
    margin: 0 0 0.35em;
  }

  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 34px);
  }
}

@media (min-width: 900px) {
  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 64px);
  }
}

@media (min-width: 960px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-hero-text .note-rot {
    display: block;
    position: absolute;
    left: calc(100% + 14px);
    top: 4px;
    margin: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.64rem;
    letter-spacing: 0.42em;
    color: var(--teal);
  }
}

@media (min-width: 1000px) {
  .page-about .tl-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .tl-fig {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-fill,
  .page-about .nl-ar,
  .page-about .tl-item::before,
  .page-about .cap,
  .page-about .cap h3 {
    transition: none;
  }
}

.page-about {
  --w: 1rem;
}