.page-about {
  display: block;
  padding-bottom: 64px;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 6px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--fg-2);
}

.page-about .breadcrumb a {
  color: var(--fg-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

.page-about .breadcrumb [aria-current="page"] {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 8px 0 48px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-hero__lead .eyebrow {
  margin: 0 0 12px;
}

.page-about .about-hero h1 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(27px, 6.4vw, 44px);
  line-height: 1.34;
  letter-spacing: .06em;
  color: var(--fg);
  margin: 0 0 18px;
}

.page-about .about-hero__intro {
  font-size: 17px;
  line-height: 1.75;
  color: var(--fg-3);
  margin: 0;
}

.page-about .about-hero__intro::first-letter {
  float: left;
  font-family: var(--font-serif);
  font-size: 3.1em;
  line-height: .92;
  padding: 5px 10px 0 0;
  color: var(--cyan);
}

.page-about .about-hero__meta {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-2);
}

.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg-2);
  letter-spacing: .02em;
}

.page-about .about-hero__panel {
  background: linear-gradient(180deg, var(--panel), var(--ink-2));
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 22px 20px;
}

.page-about .about-panel__title {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--fg-2);
}

.page-about .about-metric {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  margin: 0;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-metric__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-metric__k {
  font-size: 14px;
  line-height: 1.6;
  color: var(--fg-2);
}

.page-about .about-panel__foot {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-2);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 12px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-figure--hero {
    margin-top: 34px;
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  position: relative;
  padding: 52px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 72px;
  height: 2px;
  background: var(--cyan);
  transform: skewX(-12deg);
  transform-origin: left center;
}

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

.page-about .about-heading {
  max-width: 44em;
  margin-bottom: 30px;
}

.page-about .about-heading .eyebrow {
  margin: 0 0 10px;
}

.page-about .about-h2 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(21px, 4.6vw, 30px);
  line-height: 1.42;
  letter-spacing: .06em;
  color: var(--fg);
  margin: 0 0 12px;
}

.page-about .about-lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-2);
}

@media (min-width: 900px) {
  .page-about .about-section {
    padding: 68px 0;
  }

  .page-about .about-heading {
    margin-bottom: 38px;
  }
}

/* ---------- 每天三件事 ---------- */

.page-about .about-stream {
  display: grid;
  gap: 6px;
}

.page-about .about-stream__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 22px 18px;
  border-left: 2px solid var(--line);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: linear-gradient(90deg, rgba(52, 240, 200, .07), transparent 62%);
  transition: border-color .2s var(--ease);
}

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

.page-about .about-stream__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 32px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-stream__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: .05em;
  color: var(--fg);
}

.page-about .about-stream__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-3);
  max-width: 38em;
}

/* ---------- 时间线 ---------- */

.page-about .about-growth {
  display: grid;
  gap: 34px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-step {
  position: relative;
  padding: 0 0 30px 26px;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(52, 240, 200, .1);
}

.page-about .about-step::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 24px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .about-step:last-child {
  padding-bottom: 0;
}

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

.page-about .about-step__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-step h3 {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: .05em;
  color: var(--fg);
}

.page-about .about-step p:not(.about-step__year) {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-2);
  max-width: 38em;
}

.page-about .about-figure--square {
  margin: 0;
}

.page-about .about-figure--square img {
  aspect-ratio: 1 / 1;
}

@media (min-width: 1000px) {
  .page-about .about-growth {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: start;
  }
}

/* ---------- 数据链路 ---------- */

.page-about .about-pipeline {
  display: grid;
  gap: 30px;
}

.page-about .about-flow {
  display: grid;
  gap: 12px;
}

.page-about .about-flow__item {
  padding: 18px 20px;
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: linear-gradient(90deg, rgba(52, 240, 200, .06), transparent 58%), var(--ink-2);
}

.page-about .about-flow__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: .05em;
  color: var(--fg);
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg-2);
}

.page-about .about-figure--wide {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-pipeline {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: 12px;
}

.page-about .about-chip {
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  outline: none;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-chip:hover,
.page-about .about-chip:focus-visible {
  border-color: var(--cyan);
  background: var(--ink-2);
}

.page-about .about-chip__role {
  margin: 0 0 4px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: .05em;
  color: var(--fg);
}

.page-about .about-chip__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--cyan);
  margin-left: 6px;
}

.page-about .about-chip__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-2);
  opacity: .62;
  transition: opacity .2s var(--ease), color .2s var(--ease);
}

.page-about .about-chip:hover .about-chip__note,
.page-about .about-chip:focus-visible .about-chip__note,
.page-about .about-chip:focus-within .about-chip__note {
  opacity: 1;
  color: var(--fg-3);
}

@media (min-width: 760px) {
  .page-about .about-team {
    gap: 10px;
  }

  .page-about .about-chip {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
    border-radius: var(--r-lg);
    padding: 16px 22px;
  }

  .page-about .about-chip__role {
    margin: 0;
  }
}

/* ---------- 四条内容线 ---------- */

.page-about .about-lines__tablist {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.page-about .about-lines__tablist::-webkit-scrollbar {
  display: none;
}

.page-about .about-lines .tabs__btn {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--pill);
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--fg-2);
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: background .24s var(--ease), color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-lines .tabs__btn:hover {
  color: var(--fg);
  border-color: var(--cyan-soft);
}

.page-about .about-lines .tabs__btn[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  font-weight: 600;
}

.page-about .about-lines__panels {
  margin-top: 20px;
}

.page-about .about-lines .tabpanel {
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(52, 240, 200, .06), transparent 62%), var(--ink-2);
}

.page-about .about-lines .tabpanel + .tabpanel {
  margin-top: 14px;
}

.page-about .about-lines .tabpanel h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.5;
  letter-spacing: .02em;
  color: var(--fg);
}

.page-about .about-lines .tabpanel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-3);
  max-width: 40em;
}

.page-about .about-line__facts {
  margin-top: 14px !important;
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--fg-2) !important;
  font-size: 14px !important;
}

.page-about .about-line__v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--amber);
  padding: 2px 8px;
  border-radius: var(--r-sm);
  background: rgba(255, 154, 60, .12);
}

.page-about .about-line__link {
  margin-top: 16px;
}

.page-about .about-line__link a {
  display: inline-block;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 240, 200, .4);
  padding-bottom: 2px;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

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

/* ---------- 守住的那几条线 ---------- */

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

.page-about .about-guard li {
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-guard li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-guard h3 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: .05em;
  color: var(--fg);
}

.page-about .about-guard p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-2);
  max-width: 40em;
}

.page-about .about-guard a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 240, 200, .4);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

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

@media (min-width: 900px) {
  .page-about .about-guard {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 40px;
  }

  .page-about .about-guard li:nth-child(2) {
    border-top: 0;
    padding-top: 0;
  }
}

/* ---------- 延伸入口 ---------- */

.page-about .about-next {
  display: grid;
  gap: 12px;
}

.page-about .about-next__card {
  display: grid;
  gap: 8px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-2);
  text-decoration: none;
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-next__card:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-next__tag {
  justify-self: start;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink);
  background: var(--cyan);
  border-radius: var(--pill);
  padding: 4px 12px;
}

.page-about .about-next__title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: .05em;
  color: var(--fg);
}

.page-about .about-next__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-2);
}

.page-about .about-next__go {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

@media (min-width: 700px) {
  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-next {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 入场动效 ---------- */

.reveal-ready .page-about .about-step {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
}

.reveal-ready .page-about .about-step.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal-ready .page-about .about-step {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-next__card:hover {
    transform: none;
  }
}