.page-about {
  --about-paper-line: rgba(11, 20, 16, 0.14);
  --about-gap: 24px;
  background: var(--ink);
  color: var(--grey300);
  font-family: var(--sans);
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--grey500);
  padding: 16px 0 0;
}

.page-about .crumb a {
  color: var(--grey300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .crumb a:hover,
.page-about .crumb a:focus-visible {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

.page-about .crumb [aria-current="true"] {
  color: var(--yellow);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(120% 84% at 6% -12%, rgba(20, 53, 42, 0.92), rgba(11, 20, 16, 0) 62%),
    var(--ink);
  border-bottom: 1px solid var(--line);
  padding: 0 0 40px;
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: 20px;
  padding: 24px 18px 26px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(20, 53, 42, 0.62), rgba(20, 22, 26, 0.35));
  box-shadow: 0 24px 48px -40px rgba(0, 0, 0, 0.95);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--yellow);
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__tick {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--grey500);
}

.page-about .kicker {
  margin: 14px 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--yellow);
}

.page-about h1 {
  margin: 0;
  font-size: clamp(30px, 7.4vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--white);
  max-width: 16em;
}

.page-about .lede {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey300);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.page-about .about-hero__meta span {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--grey300);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px;
  background: var(--tint);
}

.page-about .figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--carbon);
  overflow: hidden;
}

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

.page-about .figure__cap {
  display: block;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--grey500);
  border-top: 1px solid var(--line);
}

.page-about .about-hero__figure {
  margin-top: 22px;
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 16px;
  padding-bottom: 14px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-head h2 {
  margin: 0;
  font-size: clamp(22px, 4.8vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 600;
  color: var(--white);
  max-width: 22em;
}

.page-about .about-head .mono {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--grey500);
}

.page-about p {
  margin: 0 0 14px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-origin__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--grey300);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 12px;
  height: 2px;
  background: var(--red);
}

.page-about .about-facts {
  padding: 20px 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--green);
}

.page-about .about-facts__title {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--yellow);
}

.page-about .about-facts dl {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-facts dl > div {
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-facts dl > div:first-child {
  border-top: 0;
}

.page-about .about-facts dt {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--grey500);
}

.page-about .about-facts dd {
  margin: 4px 0 0;
  font-family: var(--mono);
  font-size: 24px;
  letter-spacing: 0.02em;
  color: var(--white);
}

/* ---------- 三条主张 ---------- */
.page-about .about-desk__list {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-principle {
  background: var(--carbon);
  padding: 22px 20px;
  border-top: 2px solid transparent;
  transition: background var(--dur) var(--ease);
}

.page-about .about-principle:hover {
  background: #171b1f;
}

.page-about .about-principle--red {
  border-top-color: var(--red);
}

.page-about .about-principle--yellow {
  border-top-color: var(--yellow);
}

.page-about .about-principle--cyan {
  border-top-color: var(--cyan);
}

.page-about .about-principle__no {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--grey500);
}

.page-about .about-principle h3 {
  margin: 10px 0 8px;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey300);
}

.page-about .about-desk__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin-top: 22px;
}

.page-about .about-desk__hint {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--grey500);
}

/* ---------- 引述带 ---------- */
.page-about .about-quote {
  background: var(--paper);
  color: var(--ink);
  padding: 46px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-quote__text {
  margin: 0;
  max-width: 12em;
  font-size: clamp(26px, 6.4vw, 48px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-quote__by {
  margin: 18px 0 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--grey500);
}

/* ---------- 版本时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 12px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--red), var(--yellow) 52%, var(--cyan));
  opacity: 0.6;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 18px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--yellow);
  box-shadow: 0 0 0 3px rgba(242, 194, 48, 0.12);
}

.page-about .tl__node {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--carbon);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl__node[open] {
  border-color: rgba(242, 194, 48, 0.42);
  background: #171a1e;
}

.page-about .tl__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .tl__ver {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--yellow);
  border-radius: 2px;
  padding: 3px 8px;
}

.page-about .tl__title {
  font-size: 15px;
  line-height: 1.5;
  font-weight: 600;
  color: var(--white);
}

.page-about .tl__more {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--grey500);
}

.page-about .tl__more::before {
  content: "展开";
}

.page-about .tl__node[open] .tl__more::before {
  content: "收起";
}

.page-about .tl__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
  margin-top: 0;
  padding-top: 14px;
}

.page-about .tl__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey300);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-bar {
  display: flex;
  gap: 3px;
  height: 14px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  overflow: visible;
}

.page-about .about-bar__seg {
  position: relative;
  height: 100%;
  border-radius: 2px;
  outline-offset: 4px;
  transition: filter var(--dur) var(--ease);
}

.page-about .about-bar__seg:hover,
.page-about .about-bar__seg:focus-visible {
  filter: brightness(1.18);
}

.page-about .seg--edit {
  flex: 9 1 0;
  background: var(--red);
}

.page-about .seg--proof {
  flex: 6 1 0;
  background: var(--yellow);
}

.page-about .seg--tech {
  flex: 8 1 0;
  background: var(--cyan);
}

.page-about .seg--care {
  flex: 3 1 0;
  background: var(--grey500);
}

.page-about .about-bar__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  white-space: nowrap;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink);
  background: var(--white);
  padding: 4px 8px;
  border-radius: 2px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  pointer-events: none;
  z-index: 3;
}

.page-about .seg--tech .about-bar__tip,
.page-about .seg--care .about-bar__tip {
  left: auto;
  right: 0;
}

.page-about .about-bar__seg:hover .about-bar__tip,
.page-about .about-bar__seg:focus-visible .about-bar__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .about-legend {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 14px;
}

.page-about .about-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--grey300);
}

.page-about .about-legend b {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--white);
}

.page-about .swatch {
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.page-about .swatch--red {
  background: var(--red);
}

.page-about .swatch--yellow {
  background: var(--yellow);
}

.page-about .swatch--cyan {
  background: var(--cyan);
}

.page-about .swatch--grey {
  background: var(--grey500);
}

.page-about .about-team__figure {
  margin-top: 4px;
}

/* ---------- 流程 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(20, 53, 42, 0.5), rgba(20, 22, 26, 0.72));
}

.page-about .about-step__no {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-step h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--white);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey300);
}

.page-about .about-cadence {
  display: grid;
  gap: 1px;
  margin-top: 20px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-cadence__label {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--yellow);
  border: 1px solid rgba(242, 194, 48, 0.4);
  border-radius: 2px;
  padding: 2px 8px;
  margin-bottom: 10px;
}

.page-about .about-cadence__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey300);
}

.page-about .about-cadence__item b {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--white);
}

/* ---------- 合作与覆盖 ---------- */
.page-about .about-coop__lede {
  max-width: 40em;
  font-size: 16px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 22px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-stat__num {
  display: block;
  font-size: clamp(24px, 4.6vw, 32px);
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--grey500);
  margin-left: 4px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--grey300);
}

.page-about .about-coop__more {
  margin-top: 20px;
  font-size: 15px;
  color: var(--grey500);
}

.page-about .about-coop__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 225, 200, 0.4);
}

.page-about .about-coop__more a:hover,
.page-about .about-coop__more a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 本地根基 ---------- */
.page-about .about-roots {
  background: var(--paper);
  color: rgba(11, 20, 16, 0.74);
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-head--paper {
  border-bottom-color: var(--about-paper-line);
}

.page-about .about-head--paper h2 {
  color: var(--ink);
}

.page-about .about-head--paper .mono {
  color: rgba(11, 20, 16, 0.45);
}

.page-about .about-roots__body p {
  color: rgba(11, 20, 16, 0.72);
}

.page-about .about-roots__body a {
  color: #0f4a3a;
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 74, 58, 0.35);
}

.page-about .about-roots__body a:hover,
.page-about .about-roots__body a:focus-visible {
  border-bottom-color: #0f4a3a;
}

.page-about .about-roots__meta {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-paper-line);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(11, 20, 16, 0.48);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding: 48px 0 60px;
  background: linear-gradient(155deg, rgba(20, 53, 42, 0.68), rgba(11, 20, 16, 0) 72%);
}

.page-about .about-close__title {
  margin: 0 0 12px;
  font-size: clamp(24px, 5.2vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  font-weight: 600;
  color: var(--white);
  max-width: 18em;
}

.page-about .about-close__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey300);
  max-width: 34em;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-close .btn {
  min-height: 44px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 639px) {
  .page-about .about-bar__tip {
    display: none;
  }

  .page-about .about-hero__tick {
    display: none;
  }
}

@media (min-width: 720px) {
  .page-about .about-hero {
    padding-bottom: 52px;
  }

  .page-about .about-hero__frame {
    padding: 34px 34px 36px;
  }

  .page-about .lede {
    font-size: 16px;
  }

  .page-about .about-block,
  .page-about .about-roots {
    padding: 60px 0;
  }

  .page-about .about-desk__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-quote {
    padding: 62px 0;
  }

  .page-about .about-close {
    padding: 68px 0 80px;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: 1.9fr 1fr;
    align-items: start;
    gap: 32px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
    gap: 34px;
  }

  .page-about .tl {
    padding-left: 34px;
  }

  .page-about .tl::before {
    left: 7px;
  }

  .page-about .tl__item::before {
    left: -33px;
    top: 20px;
  }

  .page-about .tl__summary {
    padding: 16px 22px;
    grid-template-columns: 74px 1fr auto;
  }

  .page-about .tl__body {
    padding: 16px 22px 18px 96px;
  }

  .page-about .about-facts {
    padding: 24px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}
<<<END>>>