.page-about {
  --about-panel: linear-gradient(160deg, rgba(18, 26, 41, .94) 0%, rgba(10, 13, 20, .78) 100%);
  --about-soft: rgba(233, 238, 245, .78);
  --about-rail: 1.15rem;
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: 1.5rem 0 .5rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: .75rem 0 2.75rem;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .22em;
  color: var(--mist);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.75rem, 13vw, 5.75rem);
  line-height: .95;
  letter-spacing: .06em;
  background: linear-gradient(118deg, #F2D48A 0%, #D9A94A 46%, #E9EEF5 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__kicker {
  margin: 1.05rem 0 0;
  font-size: clamp(1rem, 3.6vw, 1.3rem);
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--neon);
}

.page-about .about-hero__lead {
  margin: 1.15rem 0 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-fact {
  padding: 1.1rem 1rem 1.2rem;
  background: var(--about-panel);
  transition: border-color .16s var(--ease), box-shadow .16s var(--ease);
}

.page-about .about-fact:hover {
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1.05;
  letter-spacing: .02em;
  color: var(--gold-light);
}

.page-about .about-fact__unit {
  margin-left: .25rem;
  font-family: var(--font-body);
  font-size: .72em;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-fact__label {
  display: block;
  margin-top: .45rem;
  font-size: .78rem;
  letter-spacing: .07em;
  color: var(--mist);
}

/* ---------- 章节导航 ---------- */
.page-about .about-index {
  display: flex;
  gap: .25rem;
  margin: 0 auto 0;
  padding: .75rem 0 1.1rem;
  overflow-x: auto;
  border-bottom: 1px solid var(--line-soft);
  scrollbar-width: none;
}

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

.page-about .about-index a {
  flex: 0 0 auto;
  padding: .5rem .8rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  white-space: nowrap;
  text-decoration: none;
  color: var(--mist);
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color .14s var(--ease), border-color .14s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--gold-light);
  border-color: var(--line-strong);
}

/* ---------- 通用区块 ---------- */
.page-about .about-sec {
  padding: 2.75rem 0;
}

/* ---------- 沿革 ---------- */
.page-about .about-lane {
  margin: 1.75rem 0 2.25rem;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 2.75rem;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--about-rail);
  top: .55rem;
  bottom: .55rem;
  width: 1px;
  background: linear-gradient(180deg,
    rgba(217, 169, 74, .05) 0%,
    rgba(217, 169, 74, .5) 16%,
    rgba(56, 225, 214, .38) 62%,
    rgba(217, 169, 74, .05) 100%);
}

.page-about .about-node {
  position: relative;
  padding-bottom: 2.35rem;
}

.page-about .about-node:last-child {
  padding-bottom: 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: calc(-1.6rem - 5px);
  top: .5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line-strong);
  box-shadow: 0 0 0 5px rgba(217, 169, 74, .07);
  transition: background .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .about-node:hover::before {
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(217, 169, 74, .18);
}

.page-about .about-node__index {
  display: block;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .22em;
  color: var(--neon);
}

.page-about .about-node__title {
  margin: .4rem 0 .6rem;
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: .03em;
  color: var(--moon);
}

.page-about .about-node__body {
  margin: 0;
  max-width: 64ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 波纹呼吸带 ---------- */
.page-about .about-wave {
  position: relative;
  margin: 1.5rem 0;
  overflow: hidden;
}

.page-about .about-wave img {
  display: block;
  width: 100%;
  height: auto;
  opacity: .34;
  object-fit: cover;
}

.page-about .about-wave::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg,
    rgba(10, 13, 20, .92) 0%,
    rgba(10, 13, 20, .3) 48%,
    rgba(10, 13, 20, .94) 100%);
}

/* ---------- 返水档位 ---------- */
.page-about .about-tier {
  display: grid;
  gap: .5rem;
  margin-top: 1.75rem;
}

.page-about .tier-band {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--about-panel);
  transition: border-color .16s var(--ease), box-shadow .16s var(--ease);
}

.page-about .tier-band::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--w, 20%);
  pointer-events: none;
  background: linear-gradient(90deg, rgba(217, 169, 74, .17) 0%, rgba(217, 169, 74, 0) 100%);
}

.page-about .tier-band:hover,
.page-about .tier-band[open] {
  border-color: var(--line-strong);
  box-shadow: var(--glow-gold);
}

.page-about .tier-band--1 { --w: 15%; }
.page-about .tier-band--2 { --w: 31%; }
.page-about .tier-band--3 { --w: 46%; }
.page-about .tier-band--4 { --w: 69%; }
.page-about .tier-band--5 { --w: 100%; }

.page-about .tier-band__head {
  position: relative;
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr) auto;
  align-items: center;
  gap: .75rem;
  padding: .95rem 1rem;
  cursor: pointer;
  list-style: none;
}

.page-about .tier-band__head::-webkit-details-marker,
.page-about .team-panel__more summary::-webkit-details-marker {
  display: none;
}

.page-about .tier-band__name {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--moon);
}

.page-about .tier-band__hint {
  font-size: .82rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .tier-band__rate {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  letter-spacing: .02em;
  transition: color .14s var(--ease);
}

.page-about .tier-band--1 .tier-band__rate { color: var(--mist); }
.page-about .tier-band--2 .tier-band__rate { color: var(--neon); }
.page-about .tier-band--3 .tier-band__rate { color: var(--amber); }
.page-about .tier-band--4 .tier-band__rate { color: var(--gold); }
.page-about .tier-band--5 .tier-band__rate { color: var(--gold-light); }

.page-about .tier-band[open] .tier-band__head {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .tier-band__body {
  padding: .95rem 1rem 1.15rem;
}

.page-about .tier-band__body p {
  margin: 0;
  max-width: 62ch;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-tier__foot {
  margin: 1.5rem 0 0;
  max-width: 62ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .team-panel {
  padding: 1.5rem 1.25rem 1.6rem;
  background: var(--about-panel);
  transition: box-shadow .16s var(--ease);
}

.page-about .team-panel:hover {
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.page-about .team-panel__city {
  margin: 0;
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: .26em;
  color: var(--moon);
}

.page-about .team-panel__num {
  display: block;
  margin: .55rem 0 .2rem;
  font-family: var(--font-mono);
  font-size: 2.35rem;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold-light);
}

.page-about .team-panel__unit {
  margin-left: .2rem;
  font-family: var(--font-body);
  font-size: .42em;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .team-panel__role {
  margin: 0 0 1rem;
  font-size: .9rem;
  letter-spacing: .1em;
  color: var(--neon);
}

.page-about .team-panel__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--mist);
  transition: color .14s var(--ease);
}

.page-about .team-panel__more summary::after {
  content: " ＋";
  font-family: var(--font-body);
}

.page-about .team-panel__more[open] summary::after {
  content: " －";
}

.page-about .team-panel__more summary:hover {
  color: var(--gold-light);
}

.page-about .team-panel__more p {
  margin: .75rem 0 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-wall {
  margin: 2rem 0 0;
}

/* ---------- 内容合作 ---------- */
.page-about .about-eco {
  display: grid;
  gap: 2rem;
  margin-top: 1.75rem;
}

.page-about .about-eco__body p {
  margin: 0 0 1rem;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--about-soft);
}

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

.page-about .about-eco__body a {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color .14s var(--ease), border-color .14s var(--ease);
}

.page-about .about-eco__body a:hover {
  color: var(--neon);
  border-color: var(--neon);
}

.page-about .eco-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .eco-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .9rem;
  align-items: baseline;
  padding: 1rem 1.05rem;
  background: var(--about-panel);
}

.page-about .eco-item__num {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  letter-spacing: .02em;
  color: var(--neon);
}

.page-about .eco-item__txt {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--about-soft);
}

/* ---------- 站点信息 ---------- */
.page-about .cred-list {
  margin: 1.75rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .cred-row {
  display: grid;
  gap: .35rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .cred-row__key {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--mist);
}

.page-about .cred-row__val {
  margin: 0;
  font-size: 1rem;
  line-height: 1.65;
  letter-spacing: .02em;
  color: var(--moon);
  word-break: break-word;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: 2.75rem 0 4rem;
}

.page-about .about-next__inner {
  display: grid;
  gap: 2rem;
  padding: 2rem 1.4rem 2.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--grad-vault);
  box-shadow: var(--shadow-deep);
}

.page-about .about-next__eyebrow {
  margin: 0 0 .85rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .22em;
  color: var(--neon);
}

.page-about .about-next__title {
  margin: 0;
  font-size: clamp(1.5rem, 5.5vw, 2.2rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: .04em;
  color: var(--moon);
}

.page-about .about-next__lead {
  margin: 1rem 0 0;
  max-width: 52ch;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-next__acts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem;
}

.page-about .about-next__note {
  flex: 1 0 100%;
  margin: .35rem 0 0;
  font-size: .85rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-next__note a {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 169, 74, .3);
  transition: color .14s var(--ease), border-color .14s var(--ease);
}

.page-about .about-next__note a:hover {
  color: var(--neon);
  border-color: var(--neon);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding: 1rem 0 3.25rem;
  }

  .page-about .about-lane {
    margin: 2rem 0 2.75rem;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .cred-row {
    grid-template-columns: 13rem minmax(0, 1fr);
    align-items: baseline;
    gap: 1.5rem;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
    gap: 2.5rem;
    padding: 2.5rem 2.25rem 2.75rem;
  }

  .page-about .about-next__acts {
    justify-content: flex-start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
    gap: 3.5rem;
  }

  .page-about .about-sec {
    padding: 4.5rem 0;
  }

  .page-about .about-next {
    padding: 4rem 0 5.5rem;
  }

  .page-about .about-team {
    grid-template-columns: 5fr 4fr 3fr;
    align-items: stretch;
  }

  .page-about .about-timeline {
    padding-left: 3.25rem;
  }

  .page-about .about-timeline::before {
    left: var(--about-rail);
  }

  .page-about .about-node::before {
    left: calc(-2.1rem - 5px);
  }

  .page-about .about-node__title {
    font-size: 1.22rem;
  }

  .page-about .about-wave {
    margin: 2.5rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}
</main>