.page-about {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding: 20px 0 4px;
  font-size: 0.82rem;
  color: var(--mist);
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--grey);
}

.page-about .crumbs a {
  color: var(--deep-2);
  text-decoration: none;
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--gold-deep);
  text-decoration: underline;
}

/* ---------- 通用排版 ---------- */
.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--gold-deep);
  margin: 0;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 5vw, 2.2rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--deep);
  margin: 12px 0 0;
}

.page-about .serif-lead {
  font-family: var(--font-serif);
  font-size: 1.04rem;
  line-height: 1.7;
  color: var(--deep-2);
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--gold);
}

.page-about .about-section__text {
  margin: 16px 0 0;
  font-size: 0.96rem;
  color: var(--deep-2);
  max-width: 46rem;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 46px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -160px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 42%, rgba(217, 162, 49, 0.18), rgba(217, 162, 49, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -120px;
  bottom: -60px;
  width: 260px;
  height: 220px;
  border-radius: 60% 40% 55% 45% / 50% 55% 45% 50%;
  background: rgba(62, 156, 125, 0.09);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 7.4vw, 3.3rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--deep);
  margin: 14px 0 0;
  max-width: 17em;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 46rem;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--deep-2);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(198, 188, 169, 0.7);
  border: 1px solid rgba(198, 188, 169, 0.8);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-fact {
  background: var(--paper-up);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-fact__num {
  font-size: 1.72rem;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--gold-deep);
}

.page-about .about-fact__label {
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--deep-2);
}

.page-about .about-hero__actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: 52px 0;
}

.page-about .about-section__head {
  max-width: 46rem;
}

/* ---------- 资料范围 ---------- */
.page-about .about-scope {
  align-items: start;
  gap: 34px;
}

.page-about .about-scope__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-scope__list li {
  position: relative;
  padding-left: 24px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--deep-2);
}

.page-about .about-scope__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.6em;
  width: 10px;
  height: 10px;
  border-radius: 50% 50% 50% 0;
  background: var(--gold);
  transform: rotate(-45deg);
}

.page-about .about-scope__list strong {
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-scope__note {
  margin: 26px 0 0;
  padding: 16px 18px;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--deep-2);
  background: var(--paper-up);
  border: 1px dashed rgba(198, 188, 169, 0.95);
  border-radius: var(--radius-md);
}

.page-about .media-frame {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: linear-gradient(148deg, var(--deep) 0%, var(--deep-2) 100%);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-scope__figure {
  margin-top: 8px;
}

/* ---------- 深色数据带 ---------- */
.page-about .about-band {
  position: relative;
  background: var(--deep);
  color: var(--paper);
  padding: 46px 0 52px;
  overflow: hidden;
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: -50% 45% 25% -25%;
  background: radial-gradient(ellipse at 32% 45%, rgba(217, 162, 49, 0.24), rgba(217, 162, 49, 0) 62%);
  pointer-events: none;
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -100px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(62, 156, 125, 0.22), rgba(62, 156, 125, 0) 70%);
  pointer-events: none;
}

.page-about .about-band__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-band__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.15rem, 4vw, 1.5rem);
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-band__grid {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-stat {
  padding-left: 16px;
  border-left: 2px solid rgba(217, 162, 49, 0.55);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(1.85rem, 7vw, 2.6rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--gold);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 0.92rem;
  color: var(--paper);
}

.page-about .about-stat__note {
  margin: 8px 0 0;
  font-size: 0.8rem;
  line-height: 1.65;
  color: rgba(244, 237, 225, 0.72);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-flow__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-flow__list li {
  background: var(--paper-up);
  border: 1px solid rgba(198, 188, 169, 0.55);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--deep-2);
}

.page-about .about-flow__list strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-flow__figure {
  margin-top: 30px;
}

/* ---------- 整理历程 ---------- */
.page-about .about-section--timeline {
  position: relative;
}

.page-about .about-timeline__figure {
  margin: 30px 0 0;
}

.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 36px 0 0;
  padding: 0 0 0 28px;
  display: grid;
  gap: 16px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  border-left: 2px dashed rgba(217, 162, 49, 0.62);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 15px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--paper);
}

.page-about .about-timeline__node {
  background: var(--paper-up);
  border: 1px solid rgba(198, 188, 169, 0.6);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 180ms var(--ease);
}

.page-about .about-timeline__node[open] {
  border-color: rgba(217, 162, 49, 0.65);
}

.page-about .about-timeline__node > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 16px 18px;
}

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

.page-about .about-timeline__node > summary::after {
  content: "展开";
  margin-left: auto;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--gold-deep);
  border: 1px solid rgba(217, 162, 49, 0.5);
  border-radius: var(--radius-pill);
  padding: 2px 10px;
  white-space: nowrap;
}

.page-about .about-timeline__node[open] > summary::after {
  content: "收起";
}

.page-about .about-timeline__node > summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -2px;
}

.page-about .about-timeline__index {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--gold-deep);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  line-height: 1.45;
  color: var(--deep);
}

.page-about .about-timeline__body {
  padding: 14px 18px 18px;
  border-top: 1px dashed rgba(198, 188, 169, 0.75);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--deep-2);
}

/* ---------- 维护与反馈 ---------- */
.page-about .about-team {
  align-items: start;
  gap: 30px;
}

.page-about .about-team__aside {
  padding: 26px 24px 28px;
  border-radius: var(--radius-lg);
}

.page-about .about-team__num {
  margin: 0;
  font-size: 3.1rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--gold);
}

.page-about .about-team__label {
  margin: 12px 0 0;
  font-size: 0.98rem;
  line-height: 1.65;
  color: var(--paper);
}

.page-about .about-team__note {
  margin: 14px 0 0;
  font-size: 0.85rem;
  line-height: 1.75;
  color: rgba(244, 237, 225, 0.74);
}

/* ---------- 长期做法 ---------- */
.page-about .about-section--pledge {
  background: linear-gradient(180deg, rgba(217, 162, 49, 0.09), rgba(62, 156, 125, 0.08));
  border-top: 1px solid rgba(198, 188, 169, 0.6);
  border-bottom: 1px solid rgba(198, 188, 169, 0.6);
}

.page-about .about-pledge {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-pledge__item {
  background: var(--paper-up);
  border: 1px solid rgba(198, 188, 169, 0.5);
  border-radius: var(--radius-md);
  padding: 20px 20px 22px;
}

.page-about .about-pledge__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--deep);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-pledge__item h3::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
  transform: translateY(-2px);
}

.page-about .about-pledge__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--deep-2);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  padding: 54px 0 72px;
}

.page-about .about-cta__inner {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, var(--deep) 0%, var(--deep-2) 100%);
  color: var(--paper);
  border-radius: var(--radius-lg);
  padding: 34px 24px 38px;
}

.page-about .about-cta__inner::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -60px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(217, 162, 49, 0.3), rgba(217, 162, 49, 0) 70%);
  pointer-events: none;
}

.page-about .about-cta__inner h2 {
  position: relative;
  margin: 0;
  color: var(--paper);
  font-size: clamp(1.3rem, 5vw, 1.8rem);
}

.page-about .about-cta__inner p {
  position: relative;
  margin: 16px 0 0;
  max-width: 42rem;
  font-size: 0.94rem;
  line-height: 1.85;
  color: rgba(244, 237, 225, 0.86);
}

.page-about .about-cta__links {
  position: relative;
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-flow__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 20px;
  }

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

  .page-about .about-cta__inner {
    padding: 42px 40px 46px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 30px 0 62px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-section {
    padding: 76px 0;
  }

  .page-about .about-scope {
    gap: 50px;
  }

  .page-about .about-band {
    padding: 58px 0 64px;
  }

  .page-about .about-band__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
  }

  .page-about .about-flow__figure {
    margin-top: 40px;
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-timeline__item::before {
    left: -34px;
  }

  .page-about .about-timeline__node > summary {
    padding: 18px 24px;
  }

  .page-about .about-timeline__body {
    padding: 16px 24px 20px;
  }

  .page-about .about-team {
    gap: 52px;
  }

  .page-about .about-pledge {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 22px;
  }

  .page-about .about-cta {
    padding: 66px 0 88px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-scope__figure {
    margin-top: 36px;
  }
}

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