.page-about {
  --about-line: rgba(169, 188, 203, 0.22);
  --about-card: rgba(255, 255, 255, 0.07);
  color: var(--text-on-dark);
}

/* ── 首屏 ───────────────────────────── */
.page-about .about-hero {
  padding: clamp(1.6rem, 4vw, 2.6rem) 0 clamp(2rem, 5vw, 3.2rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 0.9rem;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 7vw, 3.7rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 1.2rem 0 0;
  max-width: 36em;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--text-on-dark);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 1rem;
  margin: 2rem 0 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--paper-line);
  list-style: none;
}

.page-about .about-hero__stat {
  display: grid;
  gap: 0.2rem;
}

.page-about .about-hero__stat-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4.4vw, 2.05rem);
  line-height: 1;
  color: var(--neon);
}

.page-about .about-hero__stat-label {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

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

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

/* ── 目录条 ─────────────────────────── */
.page-about .about-index {
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  background: var(--glass);
  backdrop-filter: blur(6px);
}

.page-about .about-index__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0.75rem 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-block;
  white-space: nowrap;
  padding: 0.35rem 0.75rem;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--neon);
  border-color: rgba(233, 255, 87, 0.5);
}

/* ── 通用章节 ───────────────────────── */
.page-about .about-block {
  padding: clamp(2.2rem, 5vw, 3.4rem) 0;
}

.page-about .about-block--paper {
  background: linear-gradient(180deg, rgba(16, 56, 43, 0.9) 0%, rgba(11, 31, 51, 0.4) 100%);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-split {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.4rem);
}

.page-about .about-note-list {
  display: grid;
  gap: 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-note {
  padding: 1rem 1.1rem;
  background: var(--glass);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-sm);
  transition: transform var(--t-mid) var(--ease), background var(--t-mid) var(--ease);
}

.page-about .about-note:hover {
  transform: translateY(-4px);
  background: var(--glass-strong);
}

.page-about .about-note__title {
  margin: 0 0 0.35rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-note__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-figure {
  margin: clamp(1.4rem, 3vw, 2rem) 0;
}

/* ── 版本时间轴 ─────────────────────── */
.page-about .about-timeline {
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-node {
  position: relative;
  margin: 0 0 0.35rem;
  padding-left: 1.15rem;
  border-left: 1px solid var(--about-line);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 1.45rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mist);
  transition: background var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-about .about-node[open]::before {
  background: var(--neon);
  box-shadow: 0 0 0 4px var(--neon-soft);
}

.page-about .about-node summary {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: baseline;
  padding: 0.9rem 0;
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius-sm);
}

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

.page-about .about-node summary:hover .about-node__title {
  color: var(--neon);
}

.page-about .about-node summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

.page-about .about-node__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-node[open] .about-node__num {
  color: var(--neon);
}

.page-about .about-node__title {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-node__body {
  padding: 0 0 1.1rem;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-on-dark);
}

.page-about .about-node__body p {
  margin: 0;
}

/* ── 三类读者 ───────────────────────── */
.page-about .about-audience {
  display: grid;
  gap: 1rem;
}

.page-about .about-persona {
  padding: 1.3rem 1.25rem;
  background: var(--about-card);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  transition: transform var(--t-mid) var(--ease), background var(--t-mid) var(--ease);
}

.page-about .about-persona:hover {
  transform: translateY(-4px);
  background: var(--glass-strong);
}

.page-about .about-persona--cream {
  background: var(--cream);
  border-color: transparent;
  color: var(--ink);
}

.page-about .about-persona--cream:hover {
  background: var(--cream);
}

.page-about .about-persona__title {
  margin: 0.75rem 0 0.5rem;
  font-size: 1.12rem;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-persona--cream .about-persona__title {
  color: var(--ink);
}

.page-about .about-persona__text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-persona--cream .about-persona__text {
  color: var(--ink-soft);
}

/* ── 更新节奏 ───────────────────────── */
.page-about .about-rhythm-wrap {
  display: grid;
  gap: clamp(1rem, 2.5vw, 2rem);
}

.page-about .about-rhythm {
  display: grid;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rhythm__item {
  display: grid;
  gap: 0.3rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-rhythm__label {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-rhythm__text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-on-dark);
}

.page-about .about-inline-link {
  margin: 1.8rem 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-inline-link a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-inline-link a:hover {
  color: var(--white);
}

/* ── 团队 ───────────────────────────── */
.page-about .about-team {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.4rem);
}

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

/* ── 服务地区与备案 ─────────────────── */
.page-about .about-region {
  display: grid;
  gap: 1.4rem;
  align-items: center;
}

.page-about .about-region__title {
  margin: 0 0 0.7rem;
  font-size: clamp(1.3rem, 3.4vw, 1.7rem);
  color: var(--white);
}

.page-about .about-region__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-on-dark);
}

.page-about .about-region__facts {
  display: grid;
  gap: 0.8rem;
  margin: 0;
  padding: 0;
}

.page-about .about-region__fact {
  padding: 0.85rem 1rem;
  background: rgba(233, 255, 87, 0.06);
  border-left: 2px solid var(--neon);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .about-region__fact dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-region__fact dd {
  margin: 0.25rem 0 0;
  font-size: 15px;
  color: var(--white);
}

.page-about .about-region__fact dd.num {
  font-family: var(--mono);
  letter-spacing: 0.02em;
  color: var(--neon);
}

/* ── 收尾 ───────────────────────────── */
.page-about .about-close {
  padding: 0 0 clamp(2.6rem, 6vw, 4rem);
}

.page-about .about-close__panel {
  padding: clamp(1.6rem, 4vw, 2.8rem);
}

.page-about .about-close__kicker {
  margin: 0 0 0.7rem;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-close__title {
  margin: 0 0 0.8rem;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.2;
  color: var(--ink);
}

.page-about .about-close__text {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .about-close__panel .btn--ghost {
  color: var(--ink);
  border-color: rgba(36, 26, 18, 0.35);
}

.page-about .about-close__panel .btn--ghost:hover,
.page-about .about-close__panel .btn--ghost:focus-visible {
  color: var(--ink);
  border-color: var(--ink);
  background: rgba(36, 26, 18, 0.06);
}

/* ── 桌面布局 ───────────────────────── */
@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
  }

  .page-about .about-split {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-rhythm__item {
    grid-template-columns: 6.2rem 1fr;
    align-items: baseline;
    gap: 0.9rem;
  }

  .page-about .about-team {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

  .page-about .about-region {
    grid-template-columns: 1.3fr 0.7fr;
  }
}

@media (min-width: 1100px) {
  .page-about .about-node {
    padding-left: 1.6rem;
  }

  .page-about .about-node summary {
    grid-template-columns: 3.4rem 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-note,
  .page-about .about-persona,
  .page-about .about-node::before {
    transition: none;
  }

  .page-about .about-note:hover,
  .page-about .about-persona:hover {
    transform: none;
  }
}