.page-about .about-hero {
  padding: clamp(18px, 3.5vw, 32px) 0 clamp(44px, 7vw, 80px);
  background:
    radial-gradient(115% 95% at 88% -12%, rgba(217, 178, 106, 0.3), rgba(217, 178, 106, 0) 58%),
    linear-gradient(178deg, var(--cream) 0%, var(--paper) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 5vw, 52px);
  margin-top: clamp(16px, 3.5vw, 32px);
}

.page-about .about-hero__text .eyebrow {
  margin: 0;
}

.page-about h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(31px, 6.4vw, 58px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin: 0.34em 0 0.42em;
  max-width: 14em;
}

.page-about .about-hero__lead {
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.88;
  color: var(--ink);
  max-width: 33em;
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .about-hero__facts li {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--pine);
  background: rgba(251, 248, 241, 0.85);
}

.page-about .about-hero__figure {
  margin: 0;
  padding: 10px 10px 0;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
  max-width: 460px;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 3px;
}

.page-about .about-hero__figure figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--sage);
  padding: 10px 2px 12px;
}

/* 章节标题与导语 */
.page-about .about-h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.3;
  color: var(--ink);
  margin: 12px 0 14px;
  max-width: 21em;
}

.page-about .about-h2--light {
  color: var(--paper);
}

.page-about .about-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--sage);
  max-width: 42em;
  margin: 0;
}

/* 01 内容地图 */
.page-about .about-map {
  background: var(--paper);
}

.page-about .about-map__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-map__body {
  max-width: 700px;
}

.page-about .about-map__body .prose p:first-child {
  margin-top: 0;
}

.page-about .pullquote {
  font-family: var(--font-serif);
  font-size: clamp(19px, 2.7vw, 24px);
  line-height: 1.7;
  color: var(--pine);
  border-left: 3px solid var(--clay);
  padding: 4px 0 4px 18px;
  margin: clamp(24px, 3.5vw, 34px) 0;
  max-width: 22em;
}

.page-about .pullquote .mark {
  font-style: normal;
  background: linear-gradient(transparent 60%, var(--gold-soft) 60%);
  padding-bottom: 2px;
}

.page-about .about-notes {
  display: grid;
  gap: 20px;
  align-content: start;
  padding-top: 6px;
}

.page-about .note {
  border-left: 2px solid var(--clay);
  padding: 2px 0 2px 14px;
}

.page-about .note--gold {
  border-left-color: var(--gold);
}

.page-about .note__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--clay-2);
  margin: 0;
}

.page-about .note__v {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.75;
  color: var(--pine);
  margin: 6px 0 0;
}

/* 02 三条原则 */
.page-about .about-principles-wrap {
  background: var(--cream);
}

.page-about .about-principles__head {
  max-width: 720px;
}

.page-about .about-principles {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .principle {
  border-bottom: 1px solid var(--line);
  background: transparent;
}

.page-about .principle[open] {
  background: rgba(251, 248, 241, 0.75);
}

.page-about .principle summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 18px 8px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .principle__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--clay);
  letter-spacing: 0.05em;
}

.page-about .principle__title {
  font-family: var(--font-serif);
  font-size: clamp(19px, 3vw, 26px);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .principle__hint {
  display: none;
  font-size: 13px;
  color: var(--sage);
}

.page-about .principle__plus {
  margin-left: auto;
  width: 20px;
  height: 20px;
  position: relative;
  flex: 0 0 auto;
}

.page-about .principle__plus::before,
.page-about .principle__plus::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--pine);
  transition: transform 200ms ease, opacity 200ms ease;
}

.page-about .principle__plus::before {
  width: 14px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-about .principle__plus::after {
  width: 1.5px;
  height: 14px;
  transform: translate(-50%, -50%);
}

.page-about .principle[open] .principle__plus::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.page-about .principle__body {
  padding: 0 8px 22px;
  max-width: 680px;
}

.page-about .principle__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

/* 横向分隔图 */
.page-about .about-band {
  margin: 0;
  position: relative;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--pine);
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  opacity: 0.94;
}

.page-about .about-band figcaption {
  position: absolute;
  left: clamp(16px, 4vw, 40px);
  bottom: clamp(12px, 3vw, 24px);
  right: clamp(16px, 4vw, 40px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: rgba(31, 77, 58, 0.72);
  padding: 8px 12px;
  border-radius: 2px;
  max-width: max-content;
}

/* 03 版本演进 */
.page-about .about-history {
  background: var(--paper);
}

.page-about .about-history__head {
  max-width: 720px;
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .tl {
  position: relative;
  padding-left: 30px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--clay);
}

.page-about .tl__item {
  border-bottom: 1px dashed var(--line-strong);
  padding-bottom: 12px;
}

.page-about .tl summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 6px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__year {
  font-family: var(--font-serif);
  font-size: clamp(25px, 4.4vw, 38px);
  font-weight: 600;
  color: var(--pine);
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.page-about .tl__title {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .tl__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  background: var(--gold-soft);
  color: var(--clay-2);
  border-radius: 2px;
}

.page-about .tl__item p {
  margin: 6px 0 6px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 640px;
}

/* 04 团队 */
.page-about .about-team {
  background: var(--cream);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .team-rows {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line);
}

.page-about .team-row__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .team-row__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--clay);
}

.page-about .team-row__desc {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sage);
}

.page-about .about-team__note {
  margin: clamp(20px, 3vw, 26px) 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink);
  border-left: 2px solid var(--gold);
  padding-left: 14px;
  max-width: 640px;
}

.page-about .about-team__figure {
  margin: 0;
  padding: 10px 10px 0;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 3px;
}

.page-about .about-team__figure figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--sage);
  padding: 10px 2px 12px;
  letter-spacing: 0.03em;
}

/* 05 客户与行业 */
.page-about .about-reach {
  padding: clamp(44px, 7vw, 82px) 0;
  background:
    radial-gradient(120% 130% at 88% 0%, rgba(47, 107, 79, 0.75), rgba(31, 77, 58, 0) 62%),
    linear-gradient(160deg, var(--pine) 0%, #193a2c 100%);
  color: var(--cream);
}

.page-about .about-reach__eyebrow {
  color: var(--gold-soft);
}

.page-about .about-reach__eyebrow .mono-num {
  color: var(--gold);
}

.page-about .about-reach__lead {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.82);
  max-width: 42em;
  margin: 0;
}

.page-about .reach-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 14px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
}

.page-about .reach-stat__num {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(30px, 5.2vw, 46px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .reach-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: rgba(246, 241, 231, 0.78);
}

.page-about .reach-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-about .reach-tag {
  display: inline-block;
  font-size: 13px;
  padding: 5px 12px;
  border: 1px solid rgba(217, 178, 106, 0.42);
  border-radius: 2px;
  background: rgba(217, 178, 106, 0.08);
  color: var(--gold-soft);
  text-decoration: none;
}

.page-about .reach-tag--link {
  border-style: dashed;
  border-color: rgba(217, 178, 106, 0.7);
  background: rgba(217, 178, 106, 0.16);
}

.page-about .reach-tag--link:hover {
  background: var(--gold-soft);
  color: var(--pine);
  border-color: var(--gold-soft);
}

/* 06 典型场景 */
.page-about .about-scenes {
  background: var(--paper);
}

.page-about .scene-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 3.5vw, 34px);
}

.page-about .scene {
  scroll-margin-top: 130px;
  background: var(--cream);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
  padding: 20px 20px 22px;
  box-shadow: var(--shadow-1);
}

.page-about .scene:nth-child(even) {
  border-left-color: var(--clay);
}

.page-about .scene__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--clay-2);
  margin: 0;
}

.page-about .scene h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--pine);
  margin: 8px 0 8px;
}

.page-about .scene p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink);
}

/* 07 共同维护 */
.page-about .about-loop {
  background: var(--cream);
}

.page-about .about-loop__panel {
  background: linear-gradient(140deg, rgba(217, 178, 106, 0.26) 0%, rgba(251, 248, 241, 0.94) 52%, var(--paper) 100%);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: clamp(24px, 4vw, 46px);
  box-shadow: var(--shadow-1);
}

.page-about .about-loop__lead {
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
  max-width: 44em;
  margin: 0;
}

.page-about .loop-steps {
  list-style: none;
  display: grid;
  gap: 18px;
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding: 0;
}

.page-about .loop-step {
  border-top: 2px solid var(--clay);
  padding-top: 12px;
}

.page-about .loop-step__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--clay-2);
}

.page-about .loop-step h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--pine);
  margin: 6px 0 6px;
}

.page-about .loop-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-loop__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 34px);
}

.page-about .about-loop__textlink {
  font-size: 14px;
  color: var(--clay-2);
  text-decoration: none;
  border-bottom: 1px solid var(--clay);
  padding-bottom: 2px;
}

.page-about .about-loop__textlink:hover {
  color: var(--pine);
  border-bottom-color: var(--gold);
}

@media (min-width: 640px) {
  .page-about .principle__hint {
    display: inline;
    margin-left: 6px;
  }

  .page-about .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .loop-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-hero__figure {
    margin-top: clamp(6px, 2vw, 26px);
    transform: rotate(-1.4deg);
  }

  .page-about .about-map__grid {
    grid-template-columns: minmax(0, 680px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-notes {
    padding-top: 54px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
    gap: clamp(32px, 5vw, 60px);
  }

  .page-about .about-team__figure {
    margin-top: 46px;
  }

  .page-about .reach-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .scene:nth-child(even) {
    margin-top: 30px;
  }

  .page-about .about-timeline {
    padding-left: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__figure {
    transform: none;
  }

  .page-about .principle__plus::before,
  .page-about .principle__plus::after {
    transition: none;
  }
}