.page-about {
  --about-hair: rgba(27, 20, 22, .11);
  --about-hair-soft: rgba(27, 20, 22, .06);
  --about-gold-soft: rgba(201, 162, 39, .16);
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
  font-size: 14px;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 刊头 ---------- */
.page-about .about-head {
  position: relative;
  padding-bottom: clamp(24px, 4vw, 40px);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: min(240px, 42%);
  height: 2px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold-light) 55%, rgba(233, 201, 107, 0) 100%);
}

.page-about .about-head h1 {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.16;
  letter-spacing: -.012em;
  color: var(--ink-blue);
}

.page-about .about-head h1 em {
  font-style: normal;
  color: var(--wine);
  padding: 0 .06em;
  background: linear-gradient(180deg, transparent 64%, var(--about-gold-soft) 64%);
}

.page-about .about-head .lede {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: clamp(16px, 1.5vw, 17.5px);
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
}

.page-about .about-figures > div {
  padding-top: 10px;
  border-top: 1px solid var(--line-gold);
}

.page-about .about-figures dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--text-mute);
}

.page-about .about-figures dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(17px, 2.1vw, 21px);
  letter-spacing: .01em;
  color: var(--wine);
}

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

/* ---------- 主体：索引列 + 叙事列 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .about-rail,
.page-about .about-flow {
  min-width: 0;
  overflow-wrap: break-word;
}

.page-about .rail-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--text-mute);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .rail-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 12px;
  border-left: 2px solid var(--about-hair);
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color .22s var(--ease), background-color .22s var(--ease), color .22s var(--ease);
}

.page-about .rail-list .rail-num {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--gold);
}

.page-about .rail-list a:hover {
  border-left-color: var(--wine);
  background: rgba(110, 27, 42, .05);
  color: var(--wine-deep);
}

.page-about .rail-list a:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  border-left-color: var(--wine);
  color: var(--wine-deep);
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 4.2fr) minmax(0, 7.8fr);
    gap: clamp(34px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding: clamp(24px, 4vw, 40px) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter h2 {
  margin: 10px 0 16px;
  max-width: 26ch;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(23px, 3.1vw, 31px);
  line-height: 1.32;
  color: var(--ink-blue);
}

.page-about .chapter p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--text-soft);
}

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

.page-about .chapter__action {
  margin-top: 18px;
}

/* ---------- 品牌故事 ---------- */
.page-about .story {
  display: grid;
  gap: 20px;
}

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

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

.page-about .pullquote {
  margin: 20px 0 4px;
  padding: 6px 0 6px 18px;
  border-left: 3px solid var(--wine);
  font-family: var(--font-serif);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.6;
  color: var(--wine-deep);
}

@media (min-width: 820px) {
  .page-about .story {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(20px, 3vw, 34px);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .story__media {
    margin-top: 38px;
  }
}

/* ---------- 碎石纹理过渡带 ---------- */
.page-about .about-texture {
  position: relative;
  height: clamp(110px, 15vw, 180px);
  margin: clamp(18px, 3vw, 28px) 0 clamp(22px, 3.5vw, 34px);
  border-radius: var(--r-card);
  border: 1px solid var(--about-hair);
  overflow: hidden;
  background: var(--sand);
}

.page-about .about-texture img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-texture::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(20, 40, 61, .34) 0%, rgba(110, 27, 42, .18) 52%, rgba(247, 242, 232, .10) 100%);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  padding-left: 26px;
  margin-top: 4px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--line-gold) 0%, rgba(201, 162, 39, .08) 100%);
}

.page-about .tl-item {
  position: relative;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .tl-item:last-child {
  border-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 17px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--gold);
  transition: background-color .22s var(--ease);
}

.page-about .tl-item[open]::before {
  background: var(--gold);
}

.page-about .tl-summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--gold);
}

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

.page-about .tl-summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  border-radius: 4px;
}

.page-about .tl-year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--wine);
}

.page-about .tl-title {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
}

.page-about .tl-body {
  padding: 0 0 18px;
  max-width: 60ch;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text-soft);
}

/* ---------- 订阅三档 ---------- */
.page-about .tier-row {
  display: grid;
  gap: 12px;
  margin: 4px 0 18px;
}

.page-about .tier {
  position: relative;
  overflow: hidden;
  padding: 18px 16px 20px;
  border-radius: var(--r-card);
  border: 1px solid var(--about-hair);
  background: var(--sand);
}

.page-about .tier::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--wine) 0%, var(--gold) 100%);
}

.page-about .chapter .tier__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--wine);
}

.page-about .chapter .tier__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

@media (min-width: 620px) {
  .page-about .tier-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 维护节奏 ---------- */
.page-about .cadence {
  list-style: none;
  margin: 6px 0 18px;
  padding: 0;
  display: grid;
  gap: 14px 22px;
}

.page-about .cadence li {
  padding-left: 15px;
  border-left: 2px solid var(--line-gold);
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .cadence strong {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 15.5px;
  color: var(--ink);
}

@media (min-width: 720px) {
  .page-about .cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 团队分工 ---------- */
.page-about .roles {
  list-style: none;
  margin: 6px 0 24px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .roles li {
  padding: 16px 0 0;
  border-top: 2px solid var(--line-gold);
}

.page-about .roles__name {
  display: block;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--wine);
}

.page-about .roles__desc {
  display: block;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-soft);
}

@media (min-width: 720px) {
  .page-about .roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 收束 ---------- */
.page-about .reach-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 无障碍与减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .rail-list a,
  .page-about .tl-item::before {
    transition: none;
  }
}
</main>