.page-about .about-hero {
  padding-top: 8px;
}
.page-about .about-hero__grid {
  align-items: start;
  row-gap: 32px;
}
.page-about .about-hero__title {
  margin: 12px 0 20px;
  font-size: clamp(2.1rem, 7.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text);
}
.page-about .about-hero__mark {
  font-style: normal;
  color: var(--cyan-400);
  border-bottom: 3px solid var(--cyan-400);
  padding-bottom: 2px;
}
.page-about .about-hero__lede {
  max-width: 34em;
  color: var(--text);
}
.page-about .about-hero__text {
  max-width: 36em;
  margin-top: 18px;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-hero__link {
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid var(--line-500);
  padding-bottom: 1px;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}
.page-about .about-hero__link:hover {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}
.page-about .about-hero__figure {
  margin: 0;
}
.page-about .about-hero__figure .figure__cap {
  color: var(--muted);
}

/* 三条支撑事实 */
.page-about .about-pillars {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-500);
  border-top: 1px solid var(--line-500);
  border-bottom: 1px solid var(--line-500);
}
.page-about .about-pillars__item {
  background: var(--ink-900);
  padding: 22px 18px 26px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  column-gap: 10px;
}
.page-about .about-pillars__num {
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan-400);
  letter-spacing: -0.03em;
}
.page-about .about-pillars__num--time {
  color: var(--orange);
}
.page-about .about-pillars__unit {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}
.page-about .about-pillars__text {
  grid-column: 1 / -1;
  margin: 14px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text);
}

/* 流水线：浅色反白信息图 */
.page-about .about-flow {
  background: var(--paper);
  color: var(--ink-900);
  padding: 52px 0 56px;
  border-top: 1px solid var(--line-500);
  border-bottom: 1px solid var(--line-500);
}
.page-about .about-flow .section__title,
.page-about .about-flow .section__index,
.page-about .about-flow .eyebrow {
  color: var(--ink-900);
}
.page-about .about-flow .section__index {
  opacity: 0.35;
}
.page-about .about-flow__intro {
  max-width: 40em;
  margin: 14px 0 30px;
  font-size: 0.98rem;
  line-height: 1.8;
  color: #2C4A40;
}
.page-about .about-flow__figure {
  margin: 0 0 28px;
}
.page-about .about-flow__figure .figure__cap {
  color: #4A665C;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(11, 31, 26, 0.22);
  border: 1px solid rgba(11, 31, 26, 0.22);
}
.page-about .about-flow__step {
  background: var(--paper);
  padding: 20px 18px 24px;
  border-top: 5px solid var(--ink-900);
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}
.page-about .about-flow__step:nth-child(2) {
  border-top-color: var(--ink-700);
}
.page-about .about-flow__step:nth-child(3) {
  border-top-color: #4A665C;
}
.page-about .about-flow__step:nth-child(4) {
  border-top-color: #8FA9A0;
}
.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  background: var(--ink-900);
  color: var(--text);
}
.page-about .about-flow__step-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-900);
  opacity: 0.4;
  transition: color 0.16s var(--ease), opacity 0.16s var(--ease);
}
.page-about .about-flow__step:hover .about-flow__step-num,
.page-about .about-flow__step:focus-within .about-flow__step-num {
  color: var(--cyan-400);
  opacity: 1;
}
.page-about .about-flow__step-title {
  margin: 10px 0 8px;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: inherit;
}
.page-about .about-flow__step-body {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: #2C4A40;
  transition: color 0.16s var(--ease);
}
.page-about .about-flow__step-hand {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(11, 31, 26, 0.24);
  font-size: 0.78rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: #4A665C;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.page-about .about-flow__step:hover .about-flow__step-body,
.page-about .about-flow__step:focus-within .about-flow__step-body {
  color: var(--text);
}
.page-about .about-flow__step:hover .about-flow__step-hand,
.page-about .about-flow__step:focus-within .about-flow__step-hand {
  color: var(--cyan-200);
  border-top-color: var(--line-500);
}

/* 迭代时间线 */
.page-about .about-timeline {
  padding: 52px 0;
}
.page-about .about-timeline__intro {
  max-width: 38em;
  margin: 14px 0 6px;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-timeline__list {
  margin-top: 26px;
  border-top: 1px solid var(--line-500);
}
.page-about .about-timeline__item {
  border-bottom: 1px solid var(--line-500);
}
.page-about .about-timeline__head {
  margin: 0;
}
.page-about .about-timeline__trigger {
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 0;
  background: none;
  border: 0;
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: color 0.16s var(--ease);
}
.page-about .about-timeline__trigger:hover {
  color: var(--cyan-200);
}
.page-about .about-timeline__year {
  flex: 0 0 auto;
  min-width: 4.2em;
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan-400);
  position: relative;
  padding-left: 18px;
}
.page-about .about-timeline__year::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 8px;
  height: 8px;
  background: transparent;
  border: 1px solid var(--cyan-400);
  transition: background 0.16s var(--ease);
}
.page-about .about-timeline__trigger[aria-expanded="true"] .about-timeline__year::before {
  background: var(--cyan-400);
}
.page-about .about-timeline__year--now {
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  color: var(--orange);
}
.page-about .about-timeline__year--now::before {
  border-color: var(--orange);
}
.page-about .about-timeline__trigger[aria-expanded="true"] .about-timeline__year--now::before {
  background: var(--orange);
}
.page-about .about-timeline__label {
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.5;
}
.page-about .about-timeline__panel {
  padding: 0 0 22px;
}
.page-about .about-timeline__panel p {
  max-width: 42em;
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
}

/* 团队与规模 */
.page-about .about-team {
  padding: 52px 0;
  background: var(--ink-800);
  border-top: 1px solid var(--line-500);
  border-bottom: 1px solid var(--line-500);
}
.page-about .about-team__grid {
  row-gap: 32px;
  align-items: start;
}
.page-about .about-team__text {
  max-width: 36em;
  margin: 14px 0 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--text);
}
.page-about .about-team__bars {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .about-team__bar {
  display: grid;
  grid-template-columns: 4.6em minmax(0, 1fr) 2em;
  align-items: center;
  gap: 10px;
}
.page-about .about-team__bar-label {
  font-size: 0.86rem;
  color: var(--text);
  letter-spacing: 0.02em;
}
.page-about .about-team__track {
  display: block;
  height: 10px;
  background: var(--ink-700);
  border: 1px solid var(--line-500);
  overflow: hidden;
}
.page-about .about-team__fill {
  display: block;
  height: 100%;
  background: var(--cyan-400);
}
.page-about .about-team__fill--6 {
  width: 33.33%;
}
.page-about .about-team__fill--5 {
  width: 27.78%;
  background: #2FD7AA;
}
.page-about .about-team__fill--4 {
  width: 22.22%;
  background: #26BD96;
}
.page-about .about-team__fill--3 {
  width: 16.67%;
  background: #1D9E7D;
}
.page-about .about-team__num {
  font-size: 0.95rem;
  text-align: right;
  color: var(--cyan-200);
}
.page-about .about-team__note {
  margin: 22px 0 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .about-team__figure {
  margin: 0;
}

/* 数据来源 */
.page-about .about-source {
  padding: 52px 0;
}
.page-about .about-source__grid {
  row-gap: 28px;
  align-items: start;
}
.page-about .about-source__text {
  max-width: 30em;
  margin: 14px 0 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-source__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-500);
  border-top: 1px solid var(--line-500);
  border-bottom: 1px solid var(--line-500);
}
.page-about .about-source__item {
  background: var(--ink-900);
  padding: 18px 0 20px;
  border-left: 2px solid transparent;
  padding-left: 16px;
  transition: border-color 0.16s var(--ease);
}
.page-about .about-source__item:hover {
  border-left-color: var(--cyan-400);
}
.page-about .about-source__item-title {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.01em;
}
.page-about .about-source__item-text {
  margin: 0;
  max-width: 40em;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
}

/* 质量把关：三步路径 */
.page-about .about-check {
  padding: 52px 0;
  background: var(--ink-800);
  border-top: 1px solid var(--line-500);
}
.page-about .about-check__intro {
  max-width: 38em;
  margin: 14px 0 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-check__path {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
  counter-reset: none;
}
.page-about .about-check__node {
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--line-500);
  background: var(--ink-900);
}
.page-about .about-check__node.is-current {
  background: var(--ink-700);
  border-color: var(--cyan-400);
}
.page-about .about-check__node.is-current::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan-400);
}
.page-about .about-check__node-num {
  display: block;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--cyan-400);
  letter-spacing: 0.04em;
}
.page-about .about-check__node-title {
  margin: 8px 0 8px;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--text);
}
.page-about .about-check__node-text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-check__more {
  margin: 28px 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--text);
}
.page-about .about-check__link {
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid var(--line-500);
}
.page-about .about-check__link:hover {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* 收束 */
.page-about .about-close {
  padding: 48px 0 64px;
}
.page-about .about-close__box {
  padding: 32px 22px 34px;
  border: 1px solid var(--line-500);
  border-top: 3px solid var(--cyan-400);
  background: var(--ink-800);
}
.page-about .about-close__title {
  margin: 10px 0 12px;
  font-size: clamp(1.4rem, 4.4vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--text);
}
.page-about .about-close__text {
  max-width: 36em;
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

@media (min-width: 760px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-timeline__trigger {
    gap: 28px;
  }
  .page-about .about-check__path {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--line-500);
    border: 1px solid var(--line-500);
  }
  .page-about .about-check__node {
    border: 0;
    background: var(--ink-900);
  }
  .page-about .about-check__node.is-current {
    border: 0;
  }
  .page-about .about-close__box {
    padding: 40px 36px 42px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-top: 20px;
  }
  .page-about .about-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-flow {
    padding: 64px 0 68px;
  }
  .page-about .about-timeline__item {
    display: block;
  }
  .page-about .about-timeline__panel p {
    padding-left: calc(4.2em + 28px);
  }
  .page-about .about-team__figure {
    margin-top: 34px;
  }
  .page-about .about-close {
    padding: 56px 0 84px;
  }
}
<<<END>>>