.page-about {
  --about-text: #CBD8CE;
  --about-dim: #35594A;
  --about-rule: 1px solid var(--line);
  color: var(--paper);
}

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

.page-about p {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--about-text);
  margin: 0 0 14px;
}

.page-about h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 0 0 14px;
}

.page-about h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 4vw, 1.875rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 16px;
}

.page-about h4 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.1875rem;
  line-height: 1.25;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .about-crumb {
  padding-top: 22px;
}

.page-about .about-crumb .breadcrumb ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
}

.page-about .about-crumb .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .about-crumb .breadcrumb a {
  color: var(--mute);
  text-decoration: none;
}

.page-about .about-crumb .breadcrumb a:hover {
  color: var(--volt);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 32px 0 48px;
  border-bottom: var(--about-rule);
  background-image:
    repeating-linear-gradient(90deg, rgba(38, 68, 58, 0.55) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(180deg, rgba(38, 68, 58, 0.55) 0 1px, transparent 1px 80px),
    linear-gradient(180deg, rgba(30, 138, 84, 0.16), rgba(8, 19, 15, 0) 78%);
}

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

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.25rem, 8.5vw, 4.75rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 10px 0 20px;
  max-width: 16ch;
}

.page-about .about-hero__deck {
  max-width: 62ch;
  font-size: 1.0625rem;
}

.page-about .kicker {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--volt);
  margin: 0 0 6px;
}

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

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .about-figure {
  background: var(--ink-2);
  padding: 18px 16px 16px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-figure:nth-child(1) { border-top: var(--bar) solid var(--pitch); }
.page-about .about-figure:nth-child(2) { border-top: var(--bar) solid var(--red); }
.page-about .about-figure:nth-child(3) { border-top: var(--bar) solid var(--cyan); }
.page-about .about-figure:nth-child(4) { border-top: var(--bar) solid var(--volt); }

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 6vw, 2.375rem);
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figure__cap {
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--mute);
  line-height: 1.5;
}

/* ---------- 区块骨架 ---------- */
.page-about .about-block {
  padding: 56px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-head {
  max-width: 66ch;
  margin-bottom: 34px;
}

.page-about .about-lede {
  font-size: 1.0625rem;
  color: var(--about-text);
  margin: 0;
}

/* ---------- 阶段 ---------- */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.page-about .about-jump a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  color: var(--about-text);
  text-decoration: none;
  padding: 9px 14px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  transition: border-color .18s ease, color .18s ease, background-color .18s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  border-color: var(--volt);
  color: var(--volt);
  background: rgba(217, 240, 74, 0.06);
}

.page-about .about-jump__n {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--volt);
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail--tail {
  margin-top: 44px;
}

.page-about .about-phase {
  display: grid;
  gap: 18px;
  padding: 34px 0;
  border-top: var(--about-rule);
}

.page-about .about-phase__aside {
  display: grid;
  grid-template-columns: auto auto;
  align-items: center;
  gap: 10px 14px;
  align-content: start;
}

.page-about .about-phase__mark {
  width: 10px;
  height: 10px;
  background: var(--volt);
}

.page-about .about-phase__index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(3rem, 15vw, 4.75rem);
  line-height: 0.82;
  color: var(--about-dim);
  font-variant-numeric: tabular-nums;
}

.page-about .about-phase__tag {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--mute);
  text-transform: uppercase;
  padding-left: 24px;
  border-left: var(--bar) solid var(--pitch);
  line-height: 1.4;
}

.page-about #phase-3 .about-phase__tag { border-left-color: var(--cyan); }
.page-about #phase-4 .about-phase__tag { border-left-color: var(--amber); }

.page-about .about-phase__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-phase__points li {
  display: grid;
  gap: 5px;
  padding-left: 16px;
  border-left: 1px solid var(--line);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--about-text);
}

.page-about .about-lbl {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--volt);
  text-transform: uppercase;
}

.page-about .about-banner {
  margin: 40px 0 0;
}

.page-about .about-banner .media__frame {
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.85);
}

.page-about .about-banner .media__caption,
.page-about .about-flow__media .media__caption {
  font-size: var(--fs-12);
  color: var(--mute);
  margin-top: 10px;
  line-height: 1.6;
}

/* ---------- 折线图 ---------- */
.page-about .about-chart {
  margin: 0 0 30px;
  border: 1px solid var(--line);
  background:
    repeating-linear-gradient(90deg, rgba(38, 68, 58, 0.45) 0 1px, transparent 1px 80px),
    var(--ink-2);
  padding: 18px 12px 12px;
  overflow-x: auto;
}

.page-about .about-chart__svg {
  display: block;
  width: 100%;
  min-width: 560px;
  height: auto;
}

.page-about .about-chart__grid line {
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .about-chart__area {
  fill: rgba(30, 138, 84, 0.28);
}

.page-about .about-chart__line {
  fill: none;
  stroke: var(--volt);
  stroke-width: 2;
}

.page-about .about-chart__pt circle {
  fill: var(--ink);
  stroke: var(--volt);
  stroke-width: 3;
  transition: r .18s ease;
}

.page-about .about-chart__pt:hover circle {
  r: 9;
}

.page-about .about-chart__x {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--mute);
  letter-spacing: 0.08em;
}

.page-about .about-chart__val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  fill: var(--paper);
}

.page-about .about-chart__tip {
  font-family: var(--font-body);
  font-size: 12px;
  fill: var(--volt);
  opacity: 0;
  transition: opacity .18s ease;
}

.page-about .about-chart__pt:hover .about-chart__tip {
  opacity: 1;
}

.page-about .about-chart figcaption {
  font-size: var(--fs-12);
  color: var(--mute);
  margin-top: 10px;
  line-height: 1.6;
}

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

.page-about .about-coverage__item {
  background: var(--ink-2);
  padding: 20px 18px;
  display: grid;
  gap: 8px;
  align-content: start;
  border-left: var(--bar) solid var(--line);
}

.page-about .about-coverage__item.is-all { border-left-color: var(--volt); }
.page-about .about-coverage__item.is-cards { border-left-color: var(--red); }
.page-about .about-coverage__item.is-replay { border-left-color: var(--cyan); }
.page-about .about-coverage__item.is-goals { border-left-color: var(--pitch); }

.page-about .about-coverage__val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 2rem);
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-coverage__item.is-all .about-coverage__val { color: var(--volt); }
.page-about .about-coverage__item.is-cards .about-coverage__val { color: var(--red); }
.page-about .about-coverage__item.is-replay .about-coverage__val { color: var(--cyan); }
.page-about .about-coverage__item.is-goals .about-coverage__val { color: var(--pitch); }

.page-about .about-coverage__txt {
  font-size: var(--fs-15);
  line-height: 1.65;
  color: var(--about-text);
}

/* ---------- 数据流转 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 34px;
}

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

.page-about .about-flow__steps li {
  background: var(--ink-2);
  padding: 20px 18px;
  border-left: var(--bar) solid var(--pitch);
}

.page-about .about-flow__steps li:nth-child(2) { border-left-color: var(--yellow, var(--amber)); }
.page-about .about-flow__steps li:nth-child(3) { border-left-color: var(--cyan); }
.page-about .about-flow__steps li:nth-child(4) { border-left-color: var(--volt); }

.page-about .about-flow__n {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--mute);
  display: block;
  margin-bottom: 8px;
}

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

.page-about .about-flow__media .media__frame {
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-flow__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.8) brightness(0.85);
}

/* ---------- 三件事 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-principle {
  background: var(--ink-2);
  padding: 24px 20px;
  border-top: var(--bar) solid var(--line);
  display: grid;
  align-content: start;
}

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

.page-about .about-principle__n {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2.375rem;
  line-height: 1;
  color: var(--about-dim);
  display: block;
  margin-bottom: 14px;
}

.page-about .about-principle__foot {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-15);
  color: var(--mute);
}

.page-about .about-link {
  color: var(--red);
  text-decoration: none;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.page-about .about-link:hover {
  color: var(--volt);
}

/* ---------- 合作 ---------- */
.page-about .about-split {
  display: grid;
  gap: 30px;
}

.page-about .about-split__note {
  font-size: var(--fs-15);
  color: var(--mute);
  max-width: 40ch;
}

.page-about .about-partners {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-partner {
  background: var(--ink-2);
  padding: 20px 18px;
  border-left: var(--bar) solid var(--line);
}

.page-about .about-partner:nth-child(1) { border-left-color: var(--pitch); }
.page-about .about-partner:nth-child(2) { border-left-color: var(--cyan); }
.page-about .about-partner:nth-child(3) { border-left-color: var(--amber); }

.page-about .about-partner__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2.375rem;
  line-height: 1;
  color: var(--paper);
  display: block;
  font-variant-numeric: tabular-nums;
}

.page-about .about-partner__cap {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--volt);
  margin: 8px 0 10px;
}

.page-about .about-partner p {
  font-size: var(--fs-15);
  margin: 0;
}

.page-about .about-coopmedia {
  margin-top: 26px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  background: rgba(30, 138, 84, 0.08);
}

.page-about .about-coopmedia__label {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--cyan);
  display: block;
  margin-bottom: 12px;
}

.page-about .about-coopmedia ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-coopmedia li {
  font-size: var(--fs-15);
  line-height: 1.7;
  color: var(--about-text);
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

/* ---------- 用户群 ---------- */
.page-about .about-audience {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-aud {
  background: var(--ink-2);
  padding: 22px 20px;
}

.page-about .about-aud__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--volt);
  padding: 4px 10px;
  margin-bottom: 14px;
}

.page-about .about-aud p {
  font-size: var(--fs-15);
  margin: 0;
}

/* ---------- 页尾入口 ---------- */
.page-about .about-entry {
  padding: 56px 0 72px;
  background-image: linear-gradient(180deg, rgba(30, 138, 84, 0.14), rgba(8, 19, 15, 0));
}

.page-about .about-entry__grid {
  display: grid;
  gap: 30px;
  align-items: center;
}

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

.page-about .about-entry__media .media__frame {
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-entry__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.75) brightness(0.9);
}

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

.page-about .about-entry h2 {
  max-width: 22ch;
}

.page-about .about-entry p {
  max-width: 52ch;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-coverage {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    padding: 48px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-block {
    padding: 72px 0;
  }

  .page-about .about-phase {
    grid-template-columns: 2fr 5fr;
    gap: 48px;
    padding: 44px 0;
  }

  .page-about .about-phase__aside {
    grid-template-columns: auto auto;
    align-content: start;
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

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

  .page-about .about-split {
    grid-template-columns: 2fr 5fr;
    gap: 52px;
    align-items: start;
  }

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

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

  .page-about .about-entry__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 48px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-coverage {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__figures {
    margin-top: 8px;
  }
}

.page-about {
  --yellow: currentColor;
}