.page-about {
  --about-index-w: 208px;
  --about-soft-shadow: 0 18px 38px -30px rgba(23, 21, 15, 0.45);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: 20px;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.04em;
  color: var(--gray);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "／";
  margin-right: 8px;
  color: var(--rule);
}

.page-about .breadcrumbs__link {
  color: var(--gray);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--orange-deep);
}

.page-about .breadcrumbs__link[aria-current="page"] {
  color: var(--ink);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding: clamp(28px, 5vw, 48px) 0 clamp(44px, 7vw, 84px);
  background:
    radial-gradient(110% 82% at 92% 4%, var(--amber-pale) 0%, rgba(252, 235, 196, 0) 62%),
    var(--ivory);
  border-bottom: 1px solid var(--rule);
}

.page-about .about-cover__inner {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  align-items: end;
}

.page-about .about-cover__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.3rem, 6.4vw, var(--step-61));
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-cover__lead {
  margin: 20px 0 0;
  max-width: 44ch;
  font-size: var(--step-20);
  line-height: 1.72;
  color: var(--gray);
}

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

.page-about .about-cover__file {
  margin: 0;
  color: var(--brown);
  letter-spacing: 0.16em;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: 14px 0 0;
  padding: 20px;
  list-style: none;
  background: var(--paper);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-31);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: var(--step-12);
  line-height: 1.65;
  color: var(--gray);
}

/* ---------- 正文双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index__title {
  margin: 0;
  color: var(--brown);
  letter-spacing: 0.16em;
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__item {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-pill);
  background: var(--paper);
  color: var(--ink);
  font-size: var(--step-14);
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--orange);
  color: var(--orange-deep);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.06em;
  color: var(--brown);
}

/* ---------- 章节外壳 ---------- */
.page-about .about-section {
  scroll-margin-top: 104px;
}

.page-about .about-section + .about-section {
  margin-top: clamp(40px, 6vw, 68px);
  padding-top: clamp(40px, 6vw, 68px);
  border-top: 1px solid var(--rule);
}

.page-about .about-section__num {
  margin: 0;
  color: var(--brown);
  letter-spacing: 0.16em;
}

.page-about .about-section__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, var(--step-31));
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-section__intro {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: var(--step-16);
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-section__body {
  margin-top: 20px;
  max-width: 52ch;
}

.page-about .about-section__body p {
  margin: 0;
  font-size: var(--step-16);
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-section__body p + p {
  margin-top: 1.1em;
}

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

.page-about .about-section__body a {
  color: var(--orange-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--leaf-pale);
  box-shadow: var(--shadow-card);
}

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

.page-about .media-frame__caption {
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  line-height: 1.6;
  color: var(--brown);
  background: var(--paper);
}

.page-about .about-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
}

/* ---------- 服务清单 ---------- */
.page-about .about-services__head {
  display: grid;
  gap: 24px;
  margin-top: 16px;
}

.page-about .about-services__head .about-section__intro {
  margin-top: 0;
  max-width: 44ch;
}

.page-about .about-services__figure {
  margin: 0;
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(22px, 4vw, 32px);
}

.page-about .filter-btn {
  padding: 9px 16px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-pill);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-14);
  line-height: 1.4;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .filter-btn:hover {
  border-color: var(--leaf);
  color: var(--leaf-deep);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--paper);
}

.page-about .svc-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .svc-card {
  display: flex;
  flex-direction: column;
  padding: 22px 20px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  box-shadow: var(--about-soft-shadow);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .svc-card:hover {
  transform: translateY(-4px);
  border-color: var(--leaf-pale);
  box-shadow: var(--shadow-lift);
}

.page-about .svc-card[hidden] {
  display: none;
}

.page-about .svc-card__num {
  margin: 0;
  color: var(--brown);
  letter-spacing: 0.12em;
}

.page-about .svc-card__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: var(--step-20);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .svc-card__desc {
  margin: 10px 0 0;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--gray);
}

.page-about .svc-card__scene {
  margin: auto 0 0;
  padding-top: 16px;
  font-size: var(--step-12);
  line-height: 1.7;
  color: var(--leaf-deep);
}

.page-about .svc-card__scene::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: 12px;
  background: var(--rule);
}

/* ---------- 过渡色带 ---------- */
.page-about .about-band {
  height: clamp(36px, 6vw, 64px);
  margin: clamp(30px, 5vw, 52px) 0 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(100deg, var(--leaf-pale) 0%, rgba(220, 233, 223, 0) 80%);
}

/* ---------- 分类标签手风琴 ---------- */
.page-about .about-tags {
  margin-top: clamp(22px, 4vw, 32px);
  border-top: 1px solid var(--rule);
}

.page-about .about-tags__heading {
  margin: 0;
  font-size: inherit;
  font-weight: 400;
}

.page-about .about-tags .accordion__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  width: 100%;
  padding: 18px 0;
  border: 0;
  border-bottom: 1px solid var(--rule);
  background: none;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-tags__name {
  font-family: var(--font-display);
  font-size: var(--step-20);
  line-height: 1.4;
  color: var(--ink);
  transition: color 0.2s var(--ease);
}

.page-about .about-tags .accordion__trigger:hover .about-tags__name,
.page-about .about-tags .accordion__trigger:focus-visible .about-tags__name {
  color: var(--orange-deep);
}

.page-about .about-tags__count {
  color: var(--brown);
}

.page-about .about-tags__mark {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--step-16);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-tags .accordion__panel {
  padding: 4px 0 22px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-tags__desc {
  margin: 0;
  max-width: 46ch;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-tags__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tags__chips .tag {
  font-size: var(--step-14);
}

.page-about .about-tags__sample {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 运营节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
  margin-top: 22px;
}

.page-about .about-rhythm__body p {
  margin: 0;
  max-width: 46ch;
  font-size: var(--step-16);
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-rhythm__body p + p {
  margin-top: 1.1em;
}

.page-about .about-rhythm__body a {
  color: var(--orange-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-rhythm__figure {
  margin: 0;
}

/* ---------- 订阅周期 ---------- */
.page-about .cycle-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 4vw, 30px);
}

.page-about .cycle-card {
  display: flex;
  flex-direction: column;
  padding: 22px 20px;
  background: var(--ivory);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .cycle-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.page-about .cycle-card--featured {
  background: var(--paper);
  border-color: var(--leaf-pale);
}

.page-about .cycle-card__tag {
  margin: 0;
  color: var(--brown);
  letter-spacing: 0.12em;
}

.page-about .cycle-card__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: var(--step-20);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .cycle-card__desc {
  margin: 10px 0 0;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--gray);
}

.page-about .cycle-card__fit {
  margin: auto 0 0;
  padding-top: 14px;
  font-size: var(--step-12);
  line-height: 1.7;
  color: var(--leaf-deep);
}

.page-about .cycle-card__fit::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: 12px;
  background: var(--rule);
}

/* ---------- 会员中心 ---------- */
.page-about .about-member {
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(22px, 4vw, 32px);
  background: var(--paper);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-about .about-member__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-20);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-member__list {
  display: grid;
  gap: 12px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-member__list li {
  position: relative;
  padding-left: 20px;
  font-size: var(--step-14);
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-member__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .about-member__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--rule);
  font-size: var(--step-14);
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 联系入口 ---------- */
.page-about .about-contact {
  display: grid;
  gap: 16px;
  margin: clamp(22px, 4vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-contact__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
}

.page-about .about-contact__label {
  margin: 0;
  color: var(--brown);
  letter-spacing: 0.12em;
}

.page-about .about-contact__value {
  font-family: var(--font-mono);
  font-size: var(--step-16);
  line-height: 1.5;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-contact__note {
  font-size: var(--step-14);
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-contact__extra {
  margin: 22px 0 0;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-contact__extra a {
  color: var(--orange-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .svc-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .svc-card:nth-child(even) {
    margin-top: 20px;
  }
}

@media (min-width: 760px) {
  .page-about .cycle-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-services__head {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 920px) {
  .page-about .about-cover__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(260px, 1fr);
  }
}

@media (min-width: 1020px) {
  .page-about .about-body {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__item {
    flex: none;
  }

  .page-about .about-index__link {
    display: flex;
    width: 100%;
    padding: 11px 0;
    border: 0;
    border-bottom: 1px dashed var(--rule);
    border-radius: 0;
    background: none;
    white-space: normal;
  }

  .page-about .about-index__num {
    flex: 0 0 auto;
    padding-top: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .svc-card,
  .page-about .cycle-card,
  .page-about .about-index__link,
  .page-about .filter-btn,
  .page-about .about-tags__name {
    transition: none;
  }

  .page-about .svc-card:hover,
  .page-about .cycle-card:hover {
    transform: none;
  }
}