.page-about {
  --about-rail: 220px;
  --about-measure: 700px;
  background: var(--paper);
  color: var(--ink);
  padding-bottom: 56px;
}

/* 面包屑 */
.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 24px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ash);
}
.page-about .about-crumb a {
  color: var(--vine);
  text-decoration: none;
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  text-decoration: underline;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  max-width: var(--maxw);
  margin: 16px auto 0;
  padding: 36px 24px 76px;
  color: var(--paper);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(140, 47, 74, 0.55) 0%, rgba(140, 47, 74, 0) 58%),
    linear-gradient(152deg, var(--violet) 0%, var(--violet-deep) 82%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 93%);
}
.page-about .about-hero__vine {
  position: absolute;
  right: -14px;
  bottom: 0;
  width: 170px;
  height: 250px;
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}
.page-about .about-hero .eyebrow {
  color: var(--gold);
  letter-spacing: 0.14em;
}
.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 62px);
  line-height: 1.14;
  letter-spacing: 0.01em;
}
.page-about .about-hero__lede {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(248, 244, 236, 0.87);
}
.page-about .about-hero__side {
  padding: 20px;
  border: 1px solid rgba(217, 164, 65, 0.42);
  border-radius: var(--radius);
  background: rgba(248, 244, 236, 0.06);
}
.page-about .about-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 5px 12px;
  border: 1px solid var(--gold);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--paper);
}
.page-about .about-hero__badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
}
.page-about .about-stats {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(248, 244, 236, 0.14);
}
.page-about .about-stat:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-about .about-stat__k {
  font-size: 13px;
  color: rgba(248, 244, 236, 0.72);
}
.page-about .about-stat__v {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--gold);
}

/* 章节骨架 */
.page-about .about-section {
  display: grid;
  gap: 18px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 24px 8px;
}
.page-about .about-num {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 3px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 26px;
  letter-spacing: 0.08em;
  color: var(--violet);
}
.page-about .about-section__title {
  margin: 12px 0 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 31px);
  line-height: 1.26;
  color: var(--violet-deep);
}
.page-about .about-note {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--ash);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ash);
}
.page-about .about-section__body {
  font-size: 16px;
  line-height: 1.85;
}
.page-about .about-section__body p {
  max-width: 34em;
  margin: 0 0 1.15em;
}
.page-about .about-section__body p:last-child {
  margin-bottom: 0;
}

/* 首字下沉 */
.page-about .dropcap > p:first-of-type::first-letter {
  float: left;
  margin: 6px 10px 0 0;
  font-family: var(--font-heading);
  font-size: 3.2em;
  font-weight: 700;
  line-height: 0.9;
  color: var(--violet);
}

/* 配图 */
.page-about .about-figure {
  margin: 26px 0 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--mist);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}
.page-about .about-figure__cap {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--ash);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ash);
}

/* 引语带 */
.page-about .band.about-quote {
  margin: 44px 0;
  padding: 46px 24px;
}
.page-about .about-quote__inner {
  max-width: 880px;
  margin: 0 auto;
}
.page-about .about-quote__text {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-size: clamp(19px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}
.page-about .about-quote__src {
  display: inline-block;
  border-bottom: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(248, 244, 236, 0.62);
  transition: color 180ms ease, border-color 180ms ease;
}
.page-about .about-quote:hover .about-quote__src {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* 数据带 */
.page-about .band.about-metrics {
  padding: 36px 24px;
}
.page-about .about-metrics__grid {
  display: grid;
  gap: 22px;
  max-width: var(--maxw);
  margin: 0 auto;
}
.page-about .about-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 38px);
  letter-spacing: 0.03em;
  color: var(--paper);
}
.page-about .about-metric__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: rgba(248, 244, 236, 0.78);
}

/* 三类访客 */
.page-about .about-audience {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}
.page-about .about-audience__card {
  padding: 20px;
  border: 1px solid var(--mist);
  border-left: 3px solid var(--wine);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--paper);
  box-shadow: var(--shadow-card);
  transition: transform 200ms ease, border-left-color 200ms ease;
}
.page-about .about-audience__card:hover,
.page-about .about-audience__card:focus-within {
  transform: translateY(-2px);
  border-left-color: var(--gold);
}
.page-about .about-audience__tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--wine);
}
.page-about .about-audience__title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--violet-deep);
}
.page-about .about-audience__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .about-audience__more {
  font-size: 14px;
  color: var(--vine);
  text-decoration: none;
  border-bottom: 1px solid rgba(30, 107, 90, 0.35);
}
.page-about .about-audience__more:hover,
.page-about .about-audience__more:focus-visible {
  border-bottom-color: var(--gold);
  color: var(--violet);
}

/* 三步 */
.page-about .about-steps {
  display: grid;
  gap: 16px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-step {
  position: relative;
  padding: 22px 18px 18px;
  border: 1px solid var(--mist);
  border-radius: var(--radius);
  background: var(--paper);
}
.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 46px;
  height: 3px;
  background: var(--gold);
}
.page-about .about-step__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--violet);
}
.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--violet-deep);
}
.page-about .about-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

/* 版本时间线 */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--violet) 0%, var(--wine) 45%, var(--gold) 100%);
}
.page-about .about-tl-item {
  position: relative;
}
.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 16px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--violet);
  border-radius: 50%;
  background: var(--paper);
  box-sizing: border-box;
}
.page-about .about-tl__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius);
  background: var(--mist);
  cursor: pointer;
  list-style: none;
  transition: box-shadow 180ms ease, background 180ms ease;
}
.page-about .about-tl__summary::-webkit-details-marker {
  display: none;
}
.page-about .about-tl__summary::marker {
  content: "";
}
.page-about .about-tl__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--violet);
}
.page-about .about-tl[open] .about-tl__summary {
  background: var(--mist);
  box-shadow: inset 3px 0 0 var(--gold);
}
.page-about .about-tl[open] .about-tl__summary::after {
  content: "–";
  color: var(--wine);
}
.page-about .about-tl__summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}
.page-about .about-tl__version {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--violet);
}
.page-about .about-tl__title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .about-tl__when {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ash);
}
.page-about .about-tl__list {
  display: grid;
  gap: 6px;
  margin: 10px 0 0;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
}
.page-about .about-tl__list li::marker {
  color: var(--gold);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 20px;
  margin-top: 20px;
}
.page-about .about-team__roles {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-team__role {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--mist);
  font-size: 14px;
}
.page-about .about-team__role b {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--violet);
}

/* 服务条目与行动区 */
.page-about .about-promises {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-promise {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  line-height: 1.78;
}
.page-about .about-promise::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.6em;
  width: 7px;
  height: 7px;
  background: var(--gold);
  transform: rotate(45deg);
}
.page-about .about-cta {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  padding: 22px;
  border: 1px solid rgba(75, 30, 91, 0.16);
  border-radius: var(--radius);
  background: var(--mist);
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.78;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 平板及以上 */
@media (min-width: 760px) {
  .page-about .about-metrics__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-audience__card:nth-child(3) {
    grid-column: 1 / -1;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: start;
    gap: 28px;
  }
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

/* 桌面：非对称双栏 */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 56px 40px 96px;
    clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.82fr);
    align-items: end;
    gap: 56px;
  }
  .page-about .about-hero__vine {
    width: 210px;
    height: 290px;
    right: -6px;
    opacity: 0.6;
  }
  .page-about .about-section {
    grid-template-columns: var(--about-rail) minmax(0, var(--about-measure));
    gap: 56px;
    padding: 68px 40px 12px;
    align-items: start;
  }
  .page-about .about-section__rail {
    position: sticky;
    top: 32px;
  }
  .page-about .about-section__body {
    font-size: 17px;
  }
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-quote {
    padding: 60px 40px;
  }
  .page-about .band.about-metrics {
    padding: 44px 40px;
  }
}

/* 动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-audience__card,
  .page-about .about-quote__src,
  .page-about .about-tl__summary {
    transition: none;
  }
  .page-about .about-audience__card:hover,
  .page-about .about-audience__card:focus-within {
    transform: none;
  }
}