.page-about {
  --about-pad: clamp(44px, 6vw, 92px);
  color: var(--c-ivory);
  font-family: var(--font-body);
  line-height: 1.85;
  font-size: 17px;
  background: linear-gradient(180deg, var(--c-deep), #12081F 40%, var(--c-deep));
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: .015em;
  color: var(--c-ivory);
}

.page-about p { margin: 0 0 16px; }
.page-about p:last-child { margin-bottom: 0; }

.page-about .mono { font-family: var(--font-mono); }

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(46px, 7vw, 104px) 0 clamp(34px, 4vw, 60px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 95% at 84% 4%, rgba(255, 46, 154, .20), transparent 58%),
    radial-gradient(90% 80% at 8% 0%, rgba(0, 229, 255, .13), transparent 62%),
    linear-gradient(158deg, var(--c-plum) 0%, var(--c-deep) 66%);
}

.page-about .about-hero__glow {
  position: absolute;
  inset: auto -10% -40% 40%;
  height: 340px;
  background: radial-gradient(closest-side, rgba(212, 175, 55, .22), transparent 70%);
  pointer-events: none;
}

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

.page-about .about-hero__title {
  font-size: clamp(30px, 5.2vw, 58px);
  max-width: 18em;
  margin: 10px 0 0;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 92px;
  height: 3px;
  margin-top: 24px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-cyan) 70%, transparent);
}

.page-about .about-hero__lede {
  margin-top: 22px;
  max-width: 62ch;
  color: var(--c-mist);
  font-size: clamp(16px, 1.6vw, 19px);
}

.page-about .about-stats {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .about-stats__item {
  border-top: 1px solid var(--line);
  border-left: 2px solid rgba(212, 175, 55, .45);
  padding: 14px 0 6px 14px;
  transition: border-color .28s var(--ease), box-shadow .28s var(--ease), transform .28s var(--ease);
}

.page-about .about-stats__item:hover {
  border-left-color: var(--c-gold-bright);
  box-shadow: 0 0 24px rgba(212, 175, 55, .22);
  transform: translateY(-2px);
}

.page-about .about-stats__num {
  display: block;
  font-size: clamp(22px, 2.6vw, 30px);
  color: var(--c-gold-bright);
  letter-spacing: .04em;
}

.page-about .about-stats__label {
  display: block;
  font-size: 14px;
  color: var(--c-mist);
  letter-spacing: .04em;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(26, 11, 46, .9), rgba(11, 6, 20, .6));
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}

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

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 14px 2px;
  color: var(--c-mist);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: .06em;
  border-bottom: 2px solid transparent;
  transition: color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-index__link .mono {
  color: var(--c-cyan);
  font-size: 12px;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-gold-bright);
  border-bottom-color: var(--c-gold);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-chapter__head { margin-bottom: clamp(24px, 3.5vw, 44px); }

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
}

/* ---------- 01 起源 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
  margin-bottom: clamp(30px, 4vw, 54px);
}

.page-about .about-origin__text p { color: var(--c-mist); }
.page-about .about-origin__text p:first-child { color: var(--c-ivory); }

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  position: relative;
}

.page-about .about-node {
  border: 1px solid var(--line-soft);
  background: var(--glass);
  box-shadow: 6px 6px 0 rgba(4, 2, 10, .55);
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-node:hover { border-color: var(--line); }

.page-about .about-node[open] {
  border-color: rgba(212, 175, 55, .5);
  box-shadow: 6px 6px 0 rgba(4, 2, 10, .7), 0 0 30px rgba(212, 175, 55, .12);
}

.page-about .about-node__summary {
  display: grid;
  grid-template-columns: 42px 1fr 26px;
  grid-template-areas:
    "num year mark"
    "num title mark";
  gap: 2px 14px;
  align-items: center;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node__summary::-webkit-details-marker { display: none; }
.page-about .about-node__summary::marker { content: ""; }

.page-about .about-node__num {
  grid-area: num;
  font-size: 15px;
  color: var(--c-gold);
  letter-spacing: .08em;
}

.page-about .about-node__year {
  grid-area: year;
  font-size: 12px;
  color: var(--c-cyan);
  letter-spacing: .12em;
}

.page-about .about-node__title {
  grid-area: title;
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--c-ivory);
}

.page-about .about-node__mark {
  grid-area: mark;
  font-family: var(--font-mono);
  color: var(--c-gold);
  font-size: 18px;
  text-align: center;
  transition: transform .26s var(--ease), color .26s var(--ease);
}

.page-about .about-node[open] .about-node__mark {
  transform: rotate(45deg);
  color: var(--c-gold-bright);
}

.page-about .about-node__body {
  padding: 4px 18px 20px 74px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-node__body p {
  margin-top: 16px;
  color: var(--c-mist);
  font-size: 16px;
}

/* ---------- 02 节奏 ---------- */
.page-about .about-rhythm { display: grid; gap: clamp(24px, 4vw, 52px); }

.page-about .about-rhythm__title {
  font-size: clamp(24px, 3.4vw, 38px);
  margin: 10px 0 20px;
}

.page-about .about-rhythm__main p { color: var(--c-mist); }
.page-about .about-rhythm__main p:first-of-type { color: var(--c-ivory); }

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

.page-about .about-rhythm__aside {
  border-left: 2px solid var(--line);
  padding-left: 18px;
}

.page-about .about-index-list {
  margin: 22px 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 8px;
  color: var(--c-cyan);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: .06em;
  border-bottom: 1px solid rgba(0, 229, 255, .4);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible { color: var(--c-gold-bright); border-bottom-color: var(--c-gold); }

/* ---------- 03 会员 ---------- */
.page-about .about-tiers {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}

.page-about .about-tier {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 22px;
  background: linear-gradient(165deg, rgba(45, 27, 78, .78), rgba(11, 6, 20, .82));
  border: 1px solid var(--line-soft);
  box-shadow: 8px 8px 0 rgba(4, 2, 10, .6);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-tier:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 175, 55, .5);
  box-shadow: 8px 8px 0 rgba(4, 2, 10, .7), 0 0 34px rgba(0, 229, 255, .14);
}

.page-about .about-tier--mid { border-top: 3px solid var(--c-cyan); }
.page-about .about-tier--top {
  border-top: 3px solid var(--c-gold);
  background: linear-gradient(165deg, rgba(58, 34, 96, .85), rgba(15, 8, 26, .85));
}

.page-about .about-tier .card__title { font-size: 22px; }

.page-about .about-tier__list {
  list-style: none;
  margin: auto 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--line-soft);
  display: grid;
  gap: 8px;
}

.page-about .about-tier__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  color: var(--c-mist);
}

.page-about .about-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 9px;
  height: 2px;
  background: var(--c-gold);
}

.page-about .about-tier__cta { margin-top: 26px; }

/* ---------- 04 标签 ---------- */
.page-about .about-tags { display: grid; gap: clamp(24px, 4vw, 48px); }

.page-about .about-tags__title {
  font-size: clamp(23px, 3.2vw, 36px);
  margin: 10px 0 20px;
}

.page-about .about-tags__intro p { color: var(--c-mist); }
.page-about .about-tags__intro p:first-of-type { color: var(--c-ivory); }

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

.page-about .about-tagcard {
  position: relative;
  padding: 18px 20px 20px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--c-magenta);
  background: linear-gradient(120deg, rgba(255, 46, 154, .09), rgba(45, 27, 78, .55) 45%, rgba(11, 6, 20, .6));
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-tagcard:nth-child(2) { border-left-color: var(--c-cyan); }
.page-about .about-tagcard:nth-child(3) { border-left-color: var(--c-gold); }
.page-about .about-tagcard:nth-child(4) { border-left-color: var(--c-emerald); }

.page-about .about-tagcard:hover {
  transform: translateX(4px);
  border-right-color: var(--line);
}

.page-about .about-tagcard__num {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-mist);
}

.page-about .about-tagcard__name {
  font-size: 21px;
  margin: 4px 0 8px;
}

.page-about .about-tagcard p {
  font-size: 15px;
  color: var(--c-mist);
}

/* ---------- 05 团队 ---------- */
.page-about .about-team { display: grid; gap: clamp(22px, 3.5vw, 42px); }

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

.page-about .about-team__node {
  padding: 20px 22px;
  background: var(--glass);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--c-gold);
  box-shadow: 6px 6px 0 rgba(4, 2, 10, .55);
}

.page-about .about-team__node h3 {
  font-size: 20px;
  margin: 6px 0 10px;
}

.page-about .about-team__node p {
  font-size: 15px;
  color: var(--c-mist);
}

.page-about .about-team__city {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-cyan);
}

/* ---------- 06 生态 ---------- */
.page-about .about-eco { display: grid; gap: clamp(22px, 3.5vw, 40px); }

.page-about .about-eco__grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-about .about-eco__item {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  background: linear-gradient(200deg, rgba(45, 27, 78, .7), rgba(11, 6, 20, .78));
  box-shadow: 8px 8px 0 rgba(4, 2, 10, .6);
}

.page-about .about-eco__num {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-gold);
}

.page-about .about-eco__item h3 {
  font-size: 20px;
  margin: 8px 0 10px;
}

.page-about .about-eco__item p {
  font-size: 15px;
  color: var(--c-mist);
}

.page-about .about-milestones {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .about-milestones__item {
  padding: 16px 14px;
  text-align: center;
  border: 1px solid var(--line);
  background: radial-gradient(120% 140% at 50% 0%, rgba(212, 175, 55, .16), transparent 70%), rgba(26, 11, 46, .6);
  transition: box-shadow .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-milestones__item:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 30px rgba(212, 175, 55, .22);
}

.page-about .about-milestones__num {
  display: block;
  font-size: clamp(22px, 2.6vw, 30px);
  color: var(--c-gold-bright);
  letter-spacing: .04em;
}

.page-about .about-milestones__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--c-mist);
  letter-spacing: .06em;
}

/* ---------- 收尾 ---------- */
.page-about .about-start { border-bottom: none; }

.page-about .about-start__inner {
  padding: clamp(26px, 4vw, 48px) clamp(20px, 3vw, 44px);
  border: 1px solid var(--line);
  background:
    radial-gradient(110% 130% at 90% 0%, rgba(0, 229, 255, .14), transparent 60%),
    radial-gradient(100% 120% at 0% 100%, rgba(255, 46, 154, .16), transparent 62%),
    linear-gradient(150deg, var(--c-temple), var(--c-deep));
  box-shadow: 10px 10px 0 rgba(4, 2, 10, .65);
}

.page-about .about-start__title {
  font-size: clamp(24px, 3.4vw, 38px);
  margin: 10px 0 16px;
}

.page-about .about-start__lede {
  max-width: 68ch;
  color: var(--c-mist);
}

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

.page-about .about-start__top {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px dashed var(--line-soft);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-tiers { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-eco__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-team__list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-taglist { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .about-origin { grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); }
  .page-about .about-rhythm { grid-template-columns: minmax(0, 1.5fr) minmax(0, .85fr); }
  .page-about .about-tags { grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); }
  .page-about .about-team { grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); align-items: start; }
  .page-about .about-eco { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: start; }
  .page-about .about-eco__grid { grid-template-columns: 1fr; }
  .page-about .about-node__summary {
    grid-template-columns: 52px 110px 1fr 26px;
    grid-template-areas: "num year title mark";
    gap: 0 16px;
  }
  .page-about .about-node__body { padding-left: 178px; }
}

@media (min-width: 1180px) {
  .page-about { font-size: 18px; }
  .page-about .about-stats { gap: 30px; }
  .page-about .about-milestones { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 480px) {
  .page-about .about-hero__title { font-size: 28px; }
  .page-about .about-node__body { padding-left: 20px; }
  .page-about .about-start__inner { padding: 22px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stats__item,
  .page-about .about-tier,
  .page-about .about-tagcard,
  .page-about .about-milestones__item,
  .page-about .about-node__mark {
    transition: none;
    transform: none;
  }
}