.page-about {
  --ab-line: rgba(166, 90, 58, .55);
  --ab-edge: rgba(217, 164, 65, .20);
  --ab-gap: clamp(18px, 3vw, 32px);
}

/* ---------- 页头 ---------- */
.page-about__hero {
  padding-top: clamp(26px, 5vw, 54px);
}

.page-about__title {
  font-family: var(--sf-serif);
  font-weight: 900;
  font-size: clamp(36px, 8.2vw, 74px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--sf-cream);
  margin: 18px 0 0;
  max-width: 17ch;
}

.page-about__lede {
  max-width: 46ch;
  margin-top: 22px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--sf-sand);
}

.page-about__hero-figure {
  margin: clamp(28px, 5vw, 52px) 0 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ab-edge);
  border-radius: 4px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about__hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 章节公共 ---------- */
.page-about .sf-section__head .page-about__lead {
  max-width: 52ch;
  margin-top: 14px;
  color: var(--sf-stone);
  line-height: 1.8;
}

/* ---------- 历程时间轴 ---------- */
.page-about__stages {
  list-style: none;
  margin: clamp(28px, 5vw, 52px) 0 0;
  padding: 0;
}

.page-about__stage {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: var(--ab-gap);
  position: relative;
  padding-bottom: clamp(22px, 4vw, 40px);
}

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

.page-about__stage-rail {
  position: relative;
}

.page-about__stage-rail::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 38px;
  bottom: calc(-1 * clamp(22px, 4vw, 40px));
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--ab-line), rgba(166, 90, 58, .04));
}

.page-about__stage:last-child .page-about__stage-rail::before {
  display: none;
}

.page-about__stage-rail .sf-mono {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--sf-gold);
  background: var(--sf-night);
  border: 1px solid rgba(217, 164, 65, .45);
}

.page-about__stage-card {
  background: linear-gradient(155deg, var(--sf-ink), #131F33 78%);
  border: 1px solid var(--ab-edge);
  border-left: 3px solid rgba(185, 59, 44, .72);
  padding: clamp(18px, 3.2vw, 30px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  transition: transform .35s var(--sf-ease), border-color .35s var(--sf-ease);
}

.page-about__stage-card:hover {
  transform: translate(4px, -4px);
  border-color: rgba(217, 164, 65, .48);
}

.page-about__stage-label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sf-gold);
  margin: 0 0 8px;
}

.page-about__stage-card .sf-h3 {
  margin: 0 0 10px;
  color: var(--sf-cream);
}

.page-about__stage-card p {
  color: var(--sf-sand);
  line-height: 1.85;
}

.page-about__more {
  margin-top: 14px;
  border-top: 1px solid rgba(154, 163, 173, .18);
  padding-top: 12px;
}

.page-about__more summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sf-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--sf-gold);
}

.page-about__more summary::-webkit-details-marker {
  display: none;
}

.page-about__more summary::before {
  content: "+";
  display: inline-grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border: 1px solid rgba(217, 164, 65, .5);
  border-radius: 999px;
  font-size: 12px;
  line-height: 1;
}

.page-about__more[open] summary::before {
  content: "–";
}

.page-about__more p {
  margin-top: 10px;
  color: var(--sf-stone);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 服务主张 ---------- */
.page-about__creed-board {
  margin-top: clamp(26px, 4vw, 44px);
  position: relative;
}

.page-about__creed-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about__creed-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about__creed-tab {
  cursor: pointer;
  padding: 10px 20px;
  border: 1px solid rgba(217, 164, 65, .34);
  border-radius: 999px;
  font-family: var(--sf-serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--sf-sand);
  background: rgba(22, 38, 61, .55);
  transition: color .25s var(--sf-ease), background .25s var(--sf-ease), border-color .25s var(--sf-ease);
}

.page-about__creed-tab:hover {
  border-color: rgba(217, 164, 65, .75);
  color: var(--sf-gold);
}

.page-about #creed-greet:checked ~ .page-about__creed-tabs label[for="creed-greet"],
.page-about #creed-route:checked ~ .page-about__creed-tabs label[for="creed-route"],
.page-about #creed-record:checked ~ .page-about__creed-tabs label[for="creed-record"] {
  background: var(--sf-cinnabar);
  border-color: var(--sf-cinnabar);
  color: var(--sf-cream);
}

.page-about #creed-greet:focus-visible ~ .page-about__creed-tabs label[for="creed-greet"],
.page-about #creed-route:focus-visible ~ .page-about__creed-tabs label[for="creed-route"],
.page-about #creed-record:focus-visible ~ .page-about__creed-tabs label[for="creed-record"] {
  outline: 2px solid var(--sf-gold);
  outline-offset: 3px;
}

.page-about__creed-panel {
  display: none;
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 54px) clamp(20px, 4vw, 48px);
  border-radius: var(--sf-radius);
  background:
    linear-gradient(120deg, rgba(46, 110, 142, .55), rgba(31, 90, 120, .28) 55%, rgba(14, 26, 43, .9)),
    var(--sf-ink);
  border: 1px solid rgba(217, 164, 65, .22);
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 0 100%);
}

.page-about #creed-greet:checked ~ .page-about__creed-panels .page-about__creed-panel:nth-child(1),
.page-about #creed-route:checked ~ .page-about__creed-panels .page-about__creed-panel:nth-child(2),
.page-about #creed-record:checked ~ .page-about__creed-panels .page-about__creed-panel:nth-child(3) {
  display: block;
}

.page-about__creed-word {
  font-family: var(--sf-serif);
  font-weight: 900;
  font-size: clamp(72px, 18vw, 150px);
  line-height: .9;
  color: var(--sf-cinnabar);
  text-shadow: 3px 3px 0 rgba(217, 164, 65, .35);
  margin: 0 0 10px;
}

.page-about__creed-text {
  max-width: 44ch;
}

.page-about__creed-text .sf-h3 {
  color: var(--sf-cream);
  margin: 0 0 12px;
}

.page-about__creed-text p {
  color: var(--sf-sand);
  line-height: 1.85;
}

/* ---------- 团队构成 ---------- */
.page-about__team-grid {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about__donut-wrap {
  margin: 0;
  padding: clamp(16px, 3vw, 24px);
  background: rgba(22, 38, 61, .55);
  border: 1px solid rgba(154, 163, 173, .16);
  border-radius: var(--sf-radius);
}

.page-about__donut {
  display: block;
  width: 100%;
  max-width: 250px;
  height: auto;
  margin: 0 auto;
}

.page-about__donut-num {
  font-family: var(--sf-serif);
  font-size: 34px;
  font-weight: 900;
  fill: var(--sf-cream);
}

.page-about__donut-cap {
  font-family: var(--sf-mono);
  font-size: 12px;
  letter-spacing: .1em;
  fill: var(--sf-stone);
}

.page-about__donut-wrap figcaption {
  margin-top: 14px;
  text-align: center;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sf-stone);
}

.page-about__team-photo {
  margin: clamp(16px, 3vw, 22px) 0 0;
  overflow: hidden;
  border-radius: var(--sf-radius);
  border: 1px solid var(--ab-edge);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-about__team-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

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

.page-about__role {
  padding: clamp(18px, 3vw, 26px);
  background: linear-gradient(150deg, var(--sf-ink), #131F33 80%);
  border: 1px solid rgba(154, 163, 173, .16);
  border-left: 4px solid var(--sf-stone);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform .3s var(--sf-ease);
}

.page-about__role:hover {
  transform: translateY(-4px);
}

.page-about__role--cinnabar {
  border-left-color: var(--sf-cinnabar);
}

.page-about__role--gold {
  border-left-color: var(--sf-gold);
}

.page-about__role--azurite {
  border-left-color: var(--sf-azurite);
}

.page-about__role-num {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--sf-gold);
}

.page-about__role .sf-h3 {
  margin: 0 0 8px;
  color: var(--sf-cream);
}

.page-about__role p {
  color: var(--sf-sand);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
}

/* ---------- 本地支持 ---------- */
.page-about__local-grid {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about__map {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--sf-radius);
  border: 1px solid var(--ab-edge);
}

.page-about__map img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about__local-body p {
  color: var(--sf-sand);
  line-height: 1.85;
}

.page-about__local-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about__local-list li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(166, 90, 58, .28);
}

.page-about__local-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about__local-list .sf-mono {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sf-gold);
  padding-top: 4px;
}

.page-about__local-list p {
  margin: 0;
  font-size: 15px;
  color: var(--sf-stone);
  line-height: 1.8;
}

.page-about__local-note {
  margin-top: 22px;
  font-size: 15px;
  color: var(--sf-stone);
}

.page-about__local-note a,
.page-about__partner-close a {
  color: var(--sf-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 164, 65, .55);
  transition: color .25s var(--sf-ease), border-color .25s var(--sf-ease);
}

.page-about__local-note a:hover,
.page-about__partner-close a:hover {
  color: var(--sf-cream);
  border-color: var(--sf-cream);
}

/* ---------- 合作生态 ---------- */
.page-about__partner-grid {
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about__partner-card {
  padding: clamp(20px, 3vw, 28px);
}

.page-about__partner-tag {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sf-moss);
  margin: 0 0 10px;
}

.page-about__partner-card .sf-h3 {
  margin: 0 0 10px;
  color: var(--sf-cream);
}

.page-about__partner-card p {
  color: var(--sf-sand);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
}

.page-about__rule {
  margin: clamp(28px, 4vw, 44px) 0;
}

.page-about__partner-close {
  max-width: 60ch;
  color: var(--sf-stone);
  line-height: 1.85;
}

/* ---------- 收尾 ---------- */
.page-about__next {
  margin-top: clamp(40px, 7vw, 84px);
}

.page-about__next-inner {
  position: relative;
  padding: clamp(30px, 6vw, 64px) clamp(22px, 5vw, 60px);
  border-radius: var(--sf-radius);
  background:
    radial-gradient(120% 160% at 88% 0%, rgba(217, 164, 65, .18), transparent 58%),
    linear-gradient(140deg, rgba(185, 59, 44, .30), rgba(14, 26, 43, .95) 62%),
    var(--sf-ink);
  border: 1px solid rgba(217, 164, 65, .28);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), calc(100% - 32px) 100%, 0 100%);
}

.page-about__next-inner .sf-h2 {
  margin: 12px 0 0;
  color: var(--sf-cream);
}

.page-about__next-copy {
  max-width: 52ch;
  margin-top: 14px;
  color: var(--sf-sand);
  line-height: 1.85;
}

.page-about__next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about__stage {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .page-about__creed-text {
    padding-left: clamp(0px, 14vw, 150px);
    margin-top: -68px;
  }

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

  .page-about__role--cinnabar {
    grid-column: 1 / -1;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about__hero-figure {
    margin-top: clamp(34px, 4vw, 60px);
  }

  .page-about__creed-text {
    padding-left: clamp(0px, 18vw, 230px);
    margin-top: -96px;
  }

  .page-about__team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about__roles {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about__role--cinnabar {
    grid-column: auto;
  }

  .page-about__local-grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 1140px) {
  .page-about__stage-card {
    padding: 32px 34px;
  }
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about__stage-card,
  .page-about__role,
  .page-about__creed-tab,
  .page-about__local-note a,
  .page-about__partner-close a {
    transition: none;
  }

  .page-about__stage-card:hover,
  .page-about__role:hover {
    transform: none;
  }
}