.page-about {
  --about-rail: 184px;
  --about-rule: rgba(36, 31, 28, 0.14);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding-top: calc(var(--header-offset) + 16px);
}

.page-about .about-crumbs__nav ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.page-about .about-crumbs__nav ol li + li::before {
  content: "/";
  margin-right: 0.5em;
  color: var(--line-strong);
}

.page-about .about-crumbs__nav a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-crumbs__nav a:hover {
  color: var(--ink);
  border-bottom-color: var(--autumn);
}

/* ---------- 首屏 ---------- */

.page-about .about-lead {
  padding-block: 26px 0;
}

.page-about .about-lead__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-margin__tabs {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-tab {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 5px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  color: var(--ink-soft);
  background: transparent;
  white-space: nowrap;
}

.page-about .about-tab::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  margin-right: 7px;
  vertical-align: 1px;
  background: var(--ink-soft);
}

.page-about .about-tab--spring::before { background: var(--spring); }
.page-about .about-tab--summer::before { background: var(--summer); }
.page-about .about-tab--autumn::before { background: var(--autumn); }
.page-about .about-tab--winter::before { background: var(--winter); }

.page-about .about-margin__note {
  display: none;
}

.page-about .about-lead h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2rem, 6.4vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 8px 0 0;
  max-width: 16em;
}

.page-about .about-lead__intro {
  margin: 18px 0 0;
  max-width: 58ch;
  color: var(--ink-soft);
  font-size: 1rem;
}

.page-about .about-lead__body .about-lead__intro:first-of-type {
  color: var(--ink);
  font-size: 1.0625rem;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-body {
  padding-bottom: 8px;
}

.page-about .about-section {
  padding-block: 46px 0;
  margin-top: 46px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-head {
  margin-bottom: 24px;
}

.page-about .about-head h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.45rem, 4.4vw, 2.2rem);
  line-height: 1.32;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 10px 0 0;
  max-width: 22em;
}

.page-about .about-leadline {
  margin: 0 0 24px;
  max-width: 62ch;
  color: var(--ink-soft);
}

.page-about .about-prose p {
  margin: 0 0 16px;
  max-width: 60ch;
}

.page-about .about-note {
  margin: 22px 0 0;
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.page-about .about-prose a,
.page-about .about-note a,
.page-about .about-method__item a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--spring);
  padding-bottom: 1px;
}

.page-about .about-prose a:hover,
.page-about .about-note a:hover,
.page-about .about-method__item a:hover {
  border-bottom-color: var(--autumn);
}

/* ---------- 起点 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-quote {
  margin: 26px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-rule);
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 3.2vw, 1.5rem);
  line-height: 1.62;
  color: var(--ink);
}

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

.page-about .about-figure,
.page-about .about-wide {
  margin: 0;
  padding: 9px;
  background: var(--paper-2);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.page-about .about-figure img,
.page-about .about-wide img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

.page-about .about-figure img {
  aspect-ratio: 3 / 2;
}

.page-about .about-wide {
  margin-bottom: 26px;
}

.page-about .about-wide img {
  aspect-ratio: 4 / 3;
}

.page-about .media-caption {
  display: block;
  padding: 8px 4px 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-align: right;
}

/* ---------- 编辑方法 ---------- */

.page-about .about-method {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-method__item {
  padding: 18px 18px 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--line-strong);
  border-radius: var(--radius);
}

.page-about .about-method__item:nth-child(1) { border-top-color: var(--spring); }
.page-about .about-method__item:nth-child(2) { border-top-color: var(--summer); }
.page-about .about-method__item:nth-child(3) { border-top-color: var(--autumn); }
.page-about .about-method__item:nth-child(4) { border-top-color: var(--winter); }

.page-about .about-method__item h3 {
  font-family: var(--font-serif);
  font-size: 1.12rem;
  font-weight: 600;
  margin: 12px 0 6px;
  line-height: 1.4;
}

.page-about .about-method__item p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0 6px;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--autumn);
  box-sizing: content-box;
}

.page-about .about-timeline__item:nth-child(1)::before { border-color: var(--spring); }
.page-about .about-timeline__item:nth-child(2)::before { border-color: var(--summer); }
.page-about .about-timeline__item:nth-child(3)::before { border-color: var(--autumn); }
.page-about .about-timeline__item:nth-child(4)::before { border-color: var(--winter); }
.page-about .about-timeline__item:nth-child(5)::before { border-color: var(--autumn-gold); }

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  padding: 2px 10px;
  margin-bottom: 8px;
}

.page-about .about-timeline__item h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 6px;
  line-height: 1.4;
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 56ch;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */

.page-about .about-bars {
  margin-top: 26px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 6.5em minmax(0, 1fr) 3.4em;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-bar__label {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

.page-about .about-bar__track {
  display: block;
  height: 10px;
  border-radius: var(--pill);
  background: var(--paper-2);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--pill);
}

.page-about .about-bar__fill--a {
  width: 50%;
  background: var(--spring);
}

.page-about .about-bar__fill--b {
  width: 28%;
  background: var(--summer);
}

.page-about .about-bar__fill--c {
  width: 22%;
  background: var(--winter);
}

.page-about .about-bar__value {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-align: right;
  color: var(--ink);
}

/* ---------- 覆盖与合作 ---------- */

.page-about .about-reach {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 28px 20px;
}

.page-about .about-reach__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .about-reach__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-reach h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.35rem, 4.2vw, 2rem);
  line-height: 1.34;
  font-weight: 600;
  margin: 10px 0 12px;
  max-width: 20em;
}

.page-about .about-reach p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.95rem;
  color: var(--ink-soft);
}

.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-stat {
  background: rgba(247, 241, 230, 0.86);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 14px 14px 12px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.6rem;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

/* ---------- 工作方式 ---------- */

.page-about .about-panels {
  display: grid;
  gap: 10px;
}

.page-about .about-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  transition: border-color 0.25s ease;
}

.page-about .about-panel[open] {
  border-color: var(--line-strong);
  background: var(--paper-2);
}

.page-about .about-panel summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-serif);
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--ink);
}

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

.page-about .about-panel summary::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--autumn);
  flex: none;
}

.page-about .about-panel:nth-child(1) summary::before { background: var(--spring); }
.page-about .about-panel:nth-child(2) summary::before { background: var(--summer); }
.page-about .about-panel:nth-child(3) summary::before { background: var(--autumn); }
.page-about .about-panel:nth-child(4) summary::before { background: var(--winter); }

.page-about .about-panel summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--ink-soft);
}

.page-about .about-panel[open] summary::after {
  content: "–";
}

.page-about .about-panel__body {
  padding: 0 18px 16px;
  font-size: 0.94rem;
  color: var(--ink-soft);
}

.page-about .about-panel__body p {
  margin: 0;
  max-width: 62ch;
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  margin-top: 50px;
  background: var(--winter);
  color: var(--frost);
  border-radius: var(--radius-lg);
  padding: 32px 22px 34px;
}

.page-about .about-cta .page-no {
  color: rgba(221, 231, 231, 0.72);
}

.page-about .about-cta h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 4.4vw, 2.05rem);
  line-height: 1.32;
  font-weight: 600;
  margin: 10px 0 12px;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  color: rgba(221, 231, 231, 0.82);
  font-size: 0.95rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-cta .btn--primary {
  background: var(--frost);
  color: var(--winter);
  border-color: var(--frost);
}

.page-about .about-cta .btn--quiet {
  color: var(--frost);
}

.page-about .about-cta .btn--quiet:hover {
  color: #fff;
}

.page-about .about-cta a:focus-visible,
.page-about .about-panel summary:focus-visible,
.page-about .about-crumbs__nav a:focus-visible {
  outline: 2px solid var(--summer);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about {
    font-size: 17px;
  }

  .page-about .about-lead__intro {
    font-size: 1.0625rem;
  }

  .page-about .about-method {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-reach__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-reach {
    padding: 34px 30px;
  }

  .page-about .about-cta {
    padding: 40px 36px 42px;
  }
}

@media (min-width: 900px) {
  .page-about .about-lead__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-margin {
    position: sticky;
    top: calc(var(--header-offset) + 28px);
  }

  .page-about .about-margin__tabs {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    margin-top: 18px;
  }

  .page-about .about-tab {
    border-left-width: 3px;
    padding: 5px 12px 5px 10px;
  }

  .page-about .about-tab--spring { border-left-color: var(--spring); }
  .page-about .about-tab--summer { border-left-color: var(--summer); }
  .page-about .about-tab--autumn { border-left-color: var(--autumn); }
  .page-about .about-tab--winter { border-left-color: var(--winter); }

  .page-about .about-margin__note {
    display: block;
    margin: 22px 0 0;
    padding-top: 14px;
    border-top: 1px solid var(--about-rule);
    font-family: var(--font-mono);
    font-size: 10.5px;
    line-height: 1.7;
    letter-spacing: 0.06em;
    color: var(--ink-soft);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-section {
    padding-block: 58px 0;
    margin-top: 58px;
  }

  .page-about .about-timeline {
    margin-top: 36px;
  }

  .page-about .about-bar {
    grid-template-columns: 9em minmax(0, 1fr) 4em;
    gap: 16px;
  }
}