.page-about {
  --about-num-size: clamp(3.2rem, 11vw, 7rem);
  --about-cut: 1.6rem;
  overflow-x: clip;
  padding-top: calc(var(--frame-h) + 1.25rem);
  padding-bottom: clamp(1.5rem, 4vw, 3rem);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-about .about-lede {
  max-width: 60ch;
  margin-top: 0.75rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__text h1 {
  margin: 0.5rem 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.05rem, 6.4vw, 4.1rem);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__text .lede {
  color: var(--muted);
  font-size: var(--step-1);
  line-height: 1.75;
  max-width: 46ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 1.5rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__stat {
  padding: 0.8rem 0.9rem;
  background: var(--panel);
}

.page-about .about-hero__stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-hero__stat span {
  display: block;
  margin-top: 0.25rem;
  font-size: var(--step--1);
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .about-hero__media {
  position: relative;
}

.page-about .about-hero__rail {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--rule);
  writing-mode: vertical-rl;
}

.page-about .about-hero__plate {
  position: relative;
  aspect-ratio: 4 / 3;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  background: var(--card);
}

.page-about .about-hero__plate::after {
  content: "";
  position: absolute;
  inset: 0.55rem;
  border: 1px solid rgba(47, 243, 208, 0.32);
  pointer-events: none;
}

/* ---------- 图片组件 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure__plate {
  position: relative;
  aspect-ratio: 10 / 7;
  background: var(--card);
  border: 1px solid var(--line-soft);
}

.page-about .about-figure__plate--tall {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure .plate__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure__cap {
  margin-top: 0.7rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--cyan);
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-figure--wide {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

/* ---------- 编号章节 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: 1rem;
}

.page-about .about-chapter__num {
  font-family: var(--font-display);
  font-size: var(--about-num-size);
  font-weight: 800;
  line-height: 0.78;
  letter-spacing: -0.02em;
  color: rgba(47, 243, 208, 0.22);
  transition: color 0.25s ease;
}

@supports (-webkit-text-stroke: 1px black) {
  .page-about .about-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1px var(--line-strong);
  }
}

.page-about .about-chapter:hover .about-chapter__num {
  color: var(--cyan-soft);
}

@supports (-webkit-text-stroke: 1px black) {
  .page-about .about-chapter:hover .about-chapter__num {
    color: transparent;
    -webkit-text-stroke-color: var(--cyan);
  }
}

.page-about .about-chapter h2 {
  margin: 0.4rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4.4vw, 2.85rem);
  line-height: 1.12;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-chapter h3 {
  font-size: var(--step-1);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-chapter .prose {
  margin-top: 1rem;
}

.page-about .about-prose-after {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .about-origin {
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0 0 0 1.6rem;
  position: relative;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.3rem;
  top: 0.35rem;
  bottom: 0.35rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--line-soft));
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.3rem;
  top: 1.55rem;
  width: 1.3rem;
  height: 1px;
  background: var(--line-strong);
  transform: rotate(-30deg);
  transform-origin: left center;
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: -1.42rem;
  top: 1.4rem;
  width: 0.34rem;
  height: 0.34rem;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-timeline__card {
  padding: 0.85rem 1rem 0.95rem;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--line-strong);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-timeline__card[open] {
  background: var(--card);
  border-left-color: var(--cyan);
}

.page-about .about-timeline__card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.7rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__card summary h3 {
  margin: 0;
  font-size: var(--step-1);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-timeline__card summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-timeline__card[open] summary::after {
  content: "–";
  color: var(--orange);
}

.page-about .about-timeline__card p {
  margin: 0.6rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1px;
  margin-top: clamp(1.25rem, 3vw, 1.85rem);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-team__item {
  padding: 1.05rem 1rem 1.2rem;
  background: var(--panel);
  border-top: 2px solid var(--cyan);
  transition: border-top-color 0.2s ease, background 0.2s ease;
}

.page-about .about-team__item:hover {
  background: var(--card);
  border-top-color: var(--orange);
}

.page-about .about-team__count {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-team__role {
  margin: 0.5rem 0 0.4rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--cyan-soft);
}

.page-about .about-team__duty {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 工作方法步骤 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-step {
  padding: 1rem;
  background: var(--ink);
}

.page-about .about-step__time {
  display: inline-block;
  margin-bottom: 0.45rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.05em;
  color: var(--orange);
}

.page-about .about-step h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .about-cover {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin-top: 1.25rem;
}

.page-about .about-cover__stat-row {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-cover__stat {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  padding: 0.7rem 0.9rem;
  background: var(--card);
}

.page-about .about-cover__stat .num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-cover__stat p {
  margin: 0;
  font-size: var(--step--1);
  color: var(--muted);
}

.page-about .about-cover .prose {
  margin-top: 1rem;
}

.page-about .about-partners {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-partners__item {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0 0.85rem 0.9rem;
  border-left: 2px solid var(--line-strong);
  transition: border-left-color 0.2s ease;
}

.page-about .about-partners__item:hover {
  border-left-color: var(--cyan);
}

.page-about .about-partners__key {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  color: var(--cyan-soft);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 荣誉 ---------- */
.page-about .about-honors {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.35rem;
}

.page-about .about-honor {
  position: relative;
  padding: 1rem 1rem 1.1rem;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-bottom: 2px solid var(--line-strong);
  transition: transform 0.2s ease, border-bottom-color 0.2s ease;
}

.page-about .about-honor:hover {
  transform: translateY(-3px);
  border-bottom-color: var(--orange);
}

.page-about .about-honor__year {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--orange-soft);
}

.page-about .about-honor h3 {
  margin: 0.4rem 0 0.35rem;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-honor p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 品牌原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 1px;
  margin-top: 1.35rem;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-principle {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 0.85rem;
  padding: 1rem;
  background: var(--panel);
}

.page-about .about-principle__no {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-principle h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding: clamp(1.25rem, 4vw, 2.5rem);
  background: var(--card);
  border-top: 3px solid var(--cyan);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-cta h2 {
  margin: 0.45rem 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  line-height: 1.2;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 1.1rem;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-hero__media {
    order: -1;
    padding-left: 1.75rem;
  }

  .page-about .about-hero__rail {
    display: block;
    position: absolute;
    left: 0;
    top: 0.25rem;
  }

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

  .page-about .about-cover {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

@media (min-width: 960px) {
  .page-about .about-chapter {
    grid-template-columns: minmax(0, 11rem) minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-chapter__num {
    position: sticky;
    top: calc(var(--frame-h) + 1.25rem);
  }

  .page-about .about-timeline {
    padding-left: 2rem;
  }

  .page-about .about-principle {
    padding: 1.15rem 1.25rem;
  }
}

@media (min-width: 1100px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-honor,
  .page-about .about-team__item,
  .page-about .about-timeline__card,
  .page-about .about-chapter__num,
  .page-about .about-partners__item {
    transition: none;
  }

  .page-about .about-honor:hover {
    transform: none;
  }
}