.page-about {
  --about-line: rgba(200, 162, 74, 0.55);
  --about-ripple: rgba(10, 76, 139, 0.08);
  display: block;
}

.page-about p {
  line-height: 1.7;
}

.page-about h2 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(1.35rem, 2.9vw, 1.95rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about h3 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.35;
  margin: 0 0 6px;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: 26px;
  padding-bottom: 10px;
}

.page-about .about-hero h1 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(1.75rem, 5.2vw, 3.15rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 12px 0 16px;
  max-width: 20ch;
  color: var(--ink);
}

.page-about .about-hero__lead {
  max-width: 64ch;
  font-size: 1.02rem;
  color: var(--ink);
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
}

.page-about .about-hero__facts li {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--river);
  border-left: 2px solid var(--gold);
  padding-left: 10px;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding-top: 44px;
  padding-bottom: 44px;
}

.page-about .about-section--last {
  padding-bottom: 72px;
}

.page-about .about-section__head {
  display: grid;
  gap: 8px;
  margin-bottom: 22px;
  max-width: 62ch;
}

.page-about .about-section__lede {
  color: var(--slate);
  font-size: 0.96rem;
  margin: 0;
}

.page-about .about-split {
  display: grid;
  gap: 26px;
}

.page-about .about-split .prose p {
  margin: 0 0 1em;
  color: var(--ink);
}

.page-about .about-split .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 用途列表 ---------- */

.page-about .use-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .use-list li {
  background: var(--paper-2);
  border-radius: 18px 6px 20px 8px;
  padding: 16px 18px;
  transition: background 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .use-list li:hover {
  background: var(--paper-3);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-about .use-list__tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--river);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.page-about .use-list p {
  margin: 0;
  font-size: 0.94rem;
  color: var(--ink);
}

/* ---------- 通用图片容器 ---------- */

.page-about .about-figure {
  margin: 0 0 28px;
  overflow: hidden;
  border-radius: 22px 8px 26px 10px;
  background: var(--paper-2);
}

.page-about .about-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-figure--wide {
  aspect-ratio: 7 / 4;
  margin: 26px 0 0;
}

.page-about .about-figure--four-three {
  aspect-ratio: 4 / 3;
  margin: 26px 0 0;
}

/* ---------- 时间轴 ---------- */

.page-about .about-section .about-figure:not(.about-figure--wide):not(.about-figure--four-three) {
  aspect-ratio: 2 / 1;
}

.page-about .tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(200, 162, 74, 0.18) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 34px;
  padding-bottom: 26px;
  outline: none;
}

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

.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--gold);
  display: grid;
  place-items: center;
  transition: border-color 0.18s var(--ease);
}

.page-about .tl-dot::after {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gold);
  transition: background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus-visible .tl-dot {
  border-color: var(--cyan);
}

.page-about .tl-item:hover .tl-dot::after,
.page-about .tl-item:focus-visible .tl-dot::after {
  background: var(--cyan);
  transform: scale(1.4);
}

.page-about .tl-season {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--river);
  margin: 0 0 4px;
}

.page-about .tl-note {
  margin: 0;
  font-size: 0.92rem;
  color: var(--slate);
  max-width: 60ch;
}

/* ---------- 数据板 ---------- */

.page-about .about-board {
  padding-top: 6px;
  padding-bottom: 6px;
}

.page-about .databoard {
  background: var(--green);
  color: var(--paper);
  border-radius: 24px 8px 28px 10px;
  padding: 26px 22px 28px;
  position: relative;
  overflow: hidden;
}

.page-about .databoard::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 224, 198, 0.14) 0%, rgba(0, 224, 198, 0) 70%);
  pointer-events: none;
}

.page-about .databoard__grid,
.page-about .db-panels {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.page-about .databoard .stat {
  display: grid;
  gap: 2px;
}

.page-about .databoard .stat__value {
  font-family: var(--mono);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper-3);
}

.page-about .databoard .stat__label {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: rgba(246, 241, 231, 0.72);
}

.page-about .db-switch {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.page-about .db-tab {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--paper);
  border: 1px solid rgba(246, 241, 231, 0.35);
  border-radius: 999px;
  padding: 5px 14px;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .db-tab:hover,
.page-about .db-tab:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0, 224, 198, 0.08);
}

.page-about .db-panels {
  grid-template-columns: 1fr;
  margin-top: 18px;
}

.page-about .db-panel {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding: 14px 16px;
  border-radius: 16px 6px 18px 8px;
  border: 1px solid transparent;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .db-panel:target {
  border-color: var(--cyan);
  background: rgba(0, 224, 198, 0.07);
}

/* ---------- 服务版图 ---------- */

.page-about .map-layout {
  display: grid;
  gap: 24px;
}

.page-about .map-visual__caption {
  margin: 12px 0 0;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--slate);
  max-width: 42ch;
}

.page-about .dotmap {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .dotmap__row {
  display: flex;
  gap: 9px;
}

.page-about .dotmap__row i {
  width: 15px;
  height: 15px;
  border-radius: 4px 1px 5px 2px;
  background: var(--river);
  opacity: 0.26;
}

.page-about .dotmap__row i.is-local {
  background: var(--gold);
  opacity: 1;
}

.page-about .map-layout .prose p {
  margin: 0 0 1em;
  color: var(--ink);
}

.page-about .map-layout .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */

.page-about .team-layout {
  display: grid;
  gap: 28px;
}

.page-about .team-ring {
  position: relative;
  width: min(230px, 62vw);
  aspect-ratio: 1;
  margin: 0 auto;
  border-radius: 50%;
  background: conic-gradient(
    var(--river) 0deg 175deg,
    var(--green) 175deg 292deg,
    var(--gold) 292deg 360deg
  );
}

.page-about .team-ring::before {
  content: "";
  position: absolute;
  inset: 22%;
  border-radius: 50%;
  background: var(--paper);
}

.page-about .team-ring__center {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  z-index: 1;
}

.page-about .team-ring__center b {
  font-family: var(--mono);
  font-size: 2.1rem;
  font-weight: 600;
  color: var(--ink);
  display: block;
  line-height: 1;
}

.page-about .team-ring__center span {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .team-legend {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .team-legend li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.88rem;
  color: var(--ink);
}

.page-about .team-legend__swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex: none;
}

.page-about .team-legend__swatch--a {
  background: var(--river);
}

.page-about .team-legend__swatch--b {
  background: var(--green);
}

.page-about .team-legend__swatch--c {
  background: var(--gold);
}

.page-about .team-notes {
  display: grid;
  gap: 16px;
}

.page-about .team-note {
  border-left: 2px solid var(--about-line);
  padding-left: 16px;
}

.page-about .team-note p {
  margin: 0;
  font-size: 0.94rem;
  color: var(--slate);
}

/* ---------- 协作 ---------- */

.page-about .relay-grid {
  display: grid;
  gap: 16px;
}

.page-about .relay-card {
  border-radius: 20px 6px 22px 8px;
  padding: 22px 20px;
}

.page-about .relay-card__num {
  font-family: var(--mono);
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
}

.page-about .relay-card h3 {
  margin-bottom: 8px;
}

.page-about .relay-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.65;
}

.page-about .relay-card--river {
  background: var(--river);
  color: var(--paper);
}

.page-about .relay-card--river .relay-card__num {
  color: var(--cyan);
}

.page-about .relay-card--river p {
  color: rgba(246, 241, 231, 0.85);
}

.page-about .relay-card--green {
  background: var(--green);
  color: var(--paper);
}

.page-about .relay-card--green .relay-card__num {
  color: var(--peach);
}

.page-about .relay-card--green p {
  color: rgba(246, 241, 231, 0.85);
}

.page-about .relay-card--paper {
  background: var(--paper-2);
  color: var(--ink);
}

.page-about .relay-card--paper .relay-card__num {
  color: var(--gold);
}

.page-about .relay-card--paper p {
  color: var(--slate);
}

/* ---------- 步骤 ---------- */

.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
  counter-reset: step;
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  grid-template-areas:
    "idx title"
    "idx body";
  gap: 2px 14px;
  align-items: start;
}

.page-about .steps__item h3 {
  grid-area: title;
  margin-bottom: 4px;
}

.page-about .steps__item p {
  grid-area: body;
  margin: 0;
  font-size: 0.93rem;
  color: var(--slate);
  max-width: 58ch;
}

.page-about .steps__index {
  grid-area: idx;
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--river);
  padding-top: 2px;
  border-top: 2px solid var(--gold);
  line-height: 1.6;
}

.page-about .steps__coda {
  margin: 24px 0 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--river);
  background: var(--paper-2);
  border-radius: 999px 6px 999px 999px;
  padding: 12px 20px;
  display: inline-block;
}

/* ---------- 精选 ---------- */

.page-about .about-split--reverse {
  gap: 22px;
}

.page-about .pick-list {
  background: var(--paper-2);
  border-radius: 22px 8px 24px 10px;
  padding: 22px 20px;
}

.page-about .pick-list__label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--river);
  margin: 0 0 12px;
}

.page-about .pick-list ul {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .pick-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.92rem;
  color: var(--ink);
  line-height: 1.6;
}

.page-about .pick-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 2px;
  background: var(--gold);
}

/* ---------- 承诺 ---------- */

.page-about .promise-grid {
  display: grid;
  gap: 16px;
}

.page-about .promise-card {
  background: var(--paper-3);
  border-radius: 18px 6px 20px 8px;
  padding: 20px 18px;
  box-shadow: inset 0 0 0 1px var(--paper-2);
  transition: box-shadow 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .promise-card:hover {
  box-shadow: inset 0 0 0 1px var(--cyan);
  transform: translateY(-2px);
}

.page-about .promise-card p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--slate);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 延伸阅读 ---------- */

.page-about .more-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .more-links li {
  border-bottom: 1px solid var(--paper-2);
}

.page-about .more-links a {
  display: block;
  padding: 14px 4px;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  border-left: 2px solid transparent;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.page-about .more-links a:hover,
.page-about .more-links a:focus-visible {
  border-left-color: var(--cyan);
  color: var(--river);
  padding-left: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .about-hero {
    padding-top: 40px;
  }

  .page-about .about-section {
    padding-top: 58px;
    padding-bottom: 58px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .use-list {
    gap: 12px;
  }

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

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

  .page-about .map-layout {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 44px;
    align-items: start;
  }

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

  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 40px;
  }

  .page-about .promise-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 34px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-split {
    gap: 56px;
  }

  .page-about .tl-item:nth-child(even) {
    padding-left: 52px;
  }

  .page-about .tl-item:nth-child(3n) .tl-note {
    max-width: 54ch;
  }

  .page-about .about-hero h1 {
    max-width: 22ch;
  }

  .page-about .about-cta {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
</final>