.page-about {
  --about-shadow: 6px 8px 0 rgba(26, 29, 24, 0.08);
  --about-shadow-strong: 8px 10px 0 rgba(26, 29, 24, 0.16);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(16px, 2.4vw, 28px) clamp(36px, 5vw, 68px);
}

.page-about .about-hero__diag {
  position: absolute;
  z-index: -1;
  top: 0;
  right: -8%;
  width: min(80vw, 900px);
  height: 100%;
  background: linear-gradient(165deg, rgba(200, 16, 46, 0.10), rgba(245, 197, 24, 0.07) 56%, transparent 82%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(20px, 3.4vw, 40px);
}

.page-about .about-hero__lead {
  min-width: 0;
}

.page-about .about-hero__title {
  margin: clamp(10px, 1.6vw, 18px) 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(36px, 7.6vw, 92px);
  line-height: 1.02;
  letter-spacing: 0.01em;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.75;
}

.page-about .about-hero__panel-wrap {
  align-self: end;
  filter: drop-shadow(8px 10px 0 rgba(26, 29, 24, 0.16));
}

.page-about .about-hero__panel {
  background: var(--green);
  color: var(--paper);
  padding: clamp(20px, 3vw, 30px);
  clip-path: polygon(0 0, 100% 0, 100% 90%, 5% 100%);
  transform: rotate(-1.2deg);
}

.page-about .about-hero__panel-head {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--yellow);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__facts li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(247, 243, 232, 0.24);
}

.page-about .about-hero__facts li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-hero__facts .num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  color: var(--yellow);
}

.page-about .about-hero__facts li > span:last-child {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(247, 243, 232, 0.9);
}

.page-about .about-hero__panel-note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: rgba(247, 243, 232, 0.66);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: flex;
  gap: 6px;
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: 14px;
  border-top: 2px solid var(--ink);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 10px 13px;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  background: var(--surface);
  border: 1px solid var(--edge);
  transition: background 140ms var(--ease-snap), color 140ms var(--ease-snap), border-color 140ms var(--ease-snap);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.page-about .about-index .num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--red);
}

.page-about .about-index a:hover .num,
.page-about .about-index a:focus-visible .num {
  color: var(--yellow);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding-block: clamp(52px, 7vw, 104px);
}

.page-about .about-sec--surface {
  background: var(--surface);
}

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

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-top: clamp(14px, 2vw, 22px);
  border-top: 2px solid var(--ink);
  margin-bottom: clamp(24px, 3.6vw, 48px);
}

.page-about .about-head--invert {
  border-top-color: rgba(247, 243, 232, 0.4);
}

.page-about .about-head__no {
  font-family: var(--font-mono);
  font-size: clamp(12px, 1.5vw, 15px);
  color: var(--red);
  padding: 6px 10px 0 0;
  border-right: 2px solid var(--red);
}

.page-about .about-head--invert .about-head__no {
  color: var(--yellow);
  border-right-color: var(--yellow);
}

.page-about .about-head__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--moss);
}

.page-about .about-head--invert .about-head__kicker {
  color: rgba(247, 243, 232, 0.7);
}

.page-about .about-head h2 {
  margin: 8px 0 0;
}

.page-about .about-sec--green .about-head h2 {
  color: var(--paper);
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.75;
  color: var(--moss);
}

/* ---------- 图文双栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-split__text {
  min-width: 0;
}

.page-about .about-split__text p {
  margin: 0 0 1.05em;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.78;
}

.page-about .about-split__text > p:last-child {
  margin-bottom: 0;
}

.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure__cap {
  margin-top: 12px;
  padding-left: 10px;
  border-left: 3px solid var(--edge);
  font-family: var(--font-note);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--moss);
}

.page-about .about-sec--green .about-figure__cap {
  color: rgba(247, 243, 232, 0.75);
  border-left-color: rgba(245, 197, 24, 0.65);
}

/* ---------- 引用句 ---------- */
.page-about .about-quote {
  margin: clamp(22px, 3vw, 36px) 0;
  padding: 4px 0 4px clamp(16px, 2.2vw, 26px);
  border-left: 6px solid var(--red);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(22px, 2.9vw, 34px);
  line-height: 1.26;
  color: var(--ink);
}

.page-about .about-quote cite {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--moss);
}

/* ---------- 三条产品线：可折叠分段 ---------- */
.page-about .about-lines {
  border-top: 2px solid var(--ink);
}

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

.page-about .about-line summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: clamp(14px, 1.9vw, 20px) 6px;
  list-style: none;
  cursor: pointer;
  transition: background 140ms var(--ease-snap);
}

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

.page-about .about-line summary:hover {
  background: var(--paper);
}

.page-about .about-line__no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--red);
}

.page-about .about-line__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.15;
  letter-spacing: 0.01em;
}

.page-about .about-line__hint {
  display: none;
  font-family: var(--font-note);
  font-size: 13px;
  color: var(--moss);
}

.page-about .about-line summary::after {
  content: "+";
  width: 24px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  text-align: center;
  color: var(--red);
}

.page-about .about-line[open] summary::after {
  content: "−";
}

.page-about .about-line[open] summary {
  background: var(--paper);
}

.page-about .about-line__body {
  display: grid;
  gap: 12px;
  padding: 4px 6px clamp(18px, 2.4vw, 26px);
}

.page-about .about-line__body p {
  max-width: 78ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .about-link {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--red-deep);
  text-decoration: none;
  border-bottom: 2px solid var(--red);
  transition: color 140ms var(--ease-snap), border-color 140ms var(--ease-snap);
}

.page-about .about-link::after {
  content: "→";
  font-family: var(--font-mono);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-about .about-path {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2.4vw, 24px);
  background: var(--yellow-wash);
  border-left: 6px solid var(--yellow);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 记录方法：三步 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-step {
  padding: 16px 18px 16px 20px;
  background: var(--surface);
  border-left: 4px solid var(--green);
  box-shadow: var(--about-shadow);
}

.page-about .about-step__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.page-about .about-step__title {
  margin: 3px 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.2;
}

.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
}

/* ---------- 团队 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-top: 1px solid rgba(247, 243, 232, 0.24);
}

.page-about .about-role__key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--yellow);
}

.page-about .about-role__val {
  font-size: 14.5px;
  line-height: 1.68;
  color: rgba(247, 243, 232, 0.9);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 4px;
}

.page-about .about-timeline__track {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: min-content;
  border-top: 3px solid var(--green);
}

.page-about .about-tl {
  position: relative;
  flex: 0 0 clamp(190px, 26vw, 250px);
  padding: 28px 20px 6px 0;
  scroll-snap-align: start;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: -9px;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 4px var(--paper);
}

.page-about .about-tl:nth-child(even)::before {
  background: var(--yellow);
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--green);
  letter-spacing: 0.02em;
}

.page-about .about-tl__stage {
  display: block;
  margin-top: 4px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.2;
}

.page-about .about-tl__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--moss);
}

/* ---------- 合作与认证 ---------- */
.page-about .about-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-card {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: clamp(16px, 2vw, 22px);
  background: var(--paper);
  border: 1px solid var(--edge);
  box-shadow: var(--about-shadow);
  transition: transform 130ms var(--ease-snap), box-shadow 130ms var(--ease-snap);
}

.page-about .about-card:hover {
  transform: translateY(-2px);
  box-shadow: 8px 10px 0 rgba(26, 29, 24, 0.12);
}

.page-about .about-card .tag {
  justify-self: start;
}

.page-about .about-card h3 {
  margin: 0;
}

.page-about .about-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 品牌原则 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 24px);
}

.page-about .about-principle {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px) clamp(18px, 2.2vw, 26px);
  background: var(--surface);
  border: 1px solid var(--edge);
  transition: transform 140ms var(--ease-snap), box-shadow 140ms var(--ease-snap);
}

.page-about .about-principle::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 4px;
  background: var(--yellow);
}

.page-about .about-principle:nth-child(3n)::after {
  background: var(--red);
}

.page-about .about-principle:hover {
  transform: translateY(-3px);
  box-shadow: 8px 10px 0 rgba(200, 16, 46, 0.14);
}

.page-about .about-principle__no {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.page-about .about-principle h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.22;
}

.page-about .about-principle > p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .about-principle__note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--edge);
  font-family: var(--font-note);
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--moss);
  opacity: 0.75;
  transition: opacity 160ms var(--ease-snap), color 160ms var(--ease-snap);
}

.page-about .about-principle:hover .about-principle__note {
  opacity: 1;
  color: var(--red-deep);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(48px, 6.5vw, 92px);
  background: var(--paper);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(120deg, rgba(200, 16, 46, 0.12), rgba(245, 197, 24, 0.08) 48%, transparent 72%);
  clip-path: polygon(0 0, 64% 0, 42% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-cta__text h2 {
  margin: 10px 0 12px;
}

.page-about .about-cta__text p {
  max-width: 58ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 680px) {
  .page-about .about-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-principle:nth-child(even) {
    margin-top: clamp(10px, 2vw, 26px);
  }
}

@media (min-width: 760px) {
  .page-about .about-line summary {
    grid-template-columns: auto 220px minmax(0, 1fr) auto;
  }

  .page-about .about-line__hint {
    display: block;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }

  .page-about .about-split--reverse .about-split__text {
    order: 2;
  }

  .page-about .about-split--reverse .about-figure {
    order: 1;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 1080px) {
  .page-about .about-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-principle,
  .page-about .about-link,
  .page-about .about-index a {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-principle:hover {
    transform: none;
  }
}
<<<END>>>