.page-about {
  --about-rail-w: 208px;
  --about-gap: 56px;
  position: relative;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  padding-bottom: 88px;
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding: 22px 0 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-masthead {
  position: relative;
  padding: 34px 0 60px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand) 0%, var(--brand-hi) 34%, transparent 78%);
}

.page-about .about-masthead__inner {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

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

.page-about .about-masthead h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 4px 0 0;
  max-width: 20ch;
  transform: skewX(-3deg);
  transform-origin: left bottom;
}

.page-about .about-masthead__lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.3vw, 19px);
  line-height: 1.75;
  color: var(--silver);
}

.page-about .masthead-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .masthead-figure {
  background: var(--ink-soft);
  padding: 16px 18px;
  margin: 0;
}

.page-about .masthead-figure__label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--metal);
  margin: 0 0 6px;
}

.page-about .masthead-figure__value {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .masthead-figure__unit {
  font-family: var(--font-body);
  font-size: .48em;
  font-weight: 500;
  color: var(--metal);
  margin-left: 4px;
}

/* ---------- 长卷骨架 ---------- */

.page-about .about-chronicle {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding-top: 44px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--metal);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 1px solid var(--line);
}

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

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--metal);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .18s ease, color .18s ease, background-color .18s ease;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  border-color: var(--brand-hi);
  color: var(--white);
  background: rgba(255, 138, 61, .08);
}

.page-about .rail-link__num {
  font-size: 11px;
  color: var(--cyan);
  font-weight: 600;
}

.page-about .rail-link__text {
  font-weight: 500;
}

.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: 68px;
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .about-section--flush {
  margin-top: -44px;
}

.page-about .about-section h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 3.1vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin: 10px 0 18px;
  max-width: 24ch;
}

.page-about .about-section h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.4;
  margin: 0 0 8px;
}

.page-about .about-prose p,
.page-about .about-section .prose p {
  max-width: 68ch;
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-intro {
  max-width: 66ch;
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-aside {
  margin: 24px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--metal);
  border-left: 2px solid var(--brand);
  padding-left: 14px;
  max-width: 62ch;
}

.page-about .about-aside a {
  color: var(--brand-hi);
  text-decoration: underline;
  text-decoration-color: rgba(255, 138, 61, .5);
  text-underline-offset: 3px;
}

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

/* ---------- 起点备注条 ---------- */

.page-about .origin-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .origin-note {
  background: var(--ink-soft);
  padding: 16px 18px;
}

.page-about .origin-note__k {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 26px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .origin-note__u {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--metal);
  margin-left: 3px;
}

.page-about .origin-note__t {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--metal);
}

/* ---------- 团队比例条 ---------- */

.page-about .team-board {
  border-top: 1px solid var(--line);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "name count"
    "bar  bar"
    "desc desc";
  gap: 8px 14px;
  padding: 20px 10px 22px;
  border-bottom: 1px solid var(--line);
  outline: none;
  transition: background-color .2s ease, transform .2s ease;
}

.page-about .team-row:hover,
.page-about .team-row:focus-visible {
  background: rgba(34, 224, 214, .05);
  transform: translateX(3px);
}

.page-about .team-row__name {
  grid-area: name;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .team-row__count {
  grid-area: count;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--brand-hi);
  font-variant-numeric: tabular-nums;
}

.page-about .team-row__bar {
  grid-area: bar;
  height: 8px;
  border-radius: 999px;
  background: var(--panel);
  overflow: hidden;
}

.page-about .team-row__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--blue), var(--brand));
  transition: filter .2s ease;
}

.page-about .team-row__fill--a { width: 37.2%; }
.page-about .team-row__fill--b { width: 27.9%; }
.page-about .team-row__fill--c { width: 20.9%; }
.page-about .team-row__fill--d { width: 14.0%; background: linear-gradient(90deg, var(--blue), var(--cyan)); }

.page-about .team-row:hover .team-row__fill {
  filter: brightness(1.15);
}

.page-about .team-row__desc {
  grid-area: desc;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--metal);
  max-width: 66ch;
}

/* ---------- 采编流程 ---------- */

.page-about .media-frame {
  margin: 0 0 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

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

.page-about .media-frame__caption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--metal);
  border-top: 1px solid var(--line);
  background: var(--ink-soft);
}

.page-about .version-archive {
  margin: 34px 0 0;
}

.page-about .flow-steps {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  position: relative;
}

.page-about .flow-steps::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 14px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--brand) 0%, var(--cyan) 55%, transparent 100%);
}

.page-about .flow-step {
  position: relative;
  padding: 0 0 30px 54px;
}

.page-about .flow-step:last-child {
  padding-bottom: 4px;
}

.page-about .flow-step__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .flow-step__title {
  margin: 6px 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .flow-step__text {
  margin: 0 0 10px;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .flow-step__more {
  border-top: 1px dashed var(--line);
  padding-top: 8px;
  max-width: 64ch;
}

.page-about .flow-step__more summary {
  cursor: pointer;
  font-size: 13px;
  color: var(--brand-hi);
  list-style: none;
  padding: 4px 0;
}

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

.page-about .flow-step__more summary::before {
  content: "＋ ";
  font-family: var(--font-mono);
}

.page-about .flow-step__more[open] summary::before {
  content: "－ ";
}

.page-about .flow-step__more p {
  margin: 4px 0 8px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--metal);
}

/* ---------- 版本年表 ---------- */

.page-about .version-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: version;
}

.page-about .version-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 24px 0 26px;
  border-top: 1px solid var(--line);
}

.page-about .version-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .version-item--current {
  background: linear-gradient(90deg, rgba(255, 75, 31, .09), transparent 72%);
  padding-left: 14px;
  padding-right: 14px;
  border-left: 2px solid var(--brand);
}

.page-about .version-item__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--brand);
  font-variant-numeric: tabular-nums;
}

.page-about .version-item--current .version-item__year {
  color: var(--brand-hi);
}

.page-about .version-item__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(17px, 1.7vw, 21px);
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .version-item__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 合作生态 ---------- */

.page-about .partner-grid {
  margin-top: 6px;
}

.page-about .partner-card {
  background: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.page-about .partner-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.page-about .partner-card .card__head {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .partner-card .card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--white);
}

.page-about .partner-card .card__body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--metal);
}

/* ---------- 运转节奏 ---------- */

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

.page-about .rhythm-ticks {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .rhythm-ticks li {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .rhythm-ticks__d {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .rhythm-ticks__t {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 收尾 ---------- */

.page-about .closing-grid {
  margin-top: 30px;
}

.page-about .closing-tile {
  display: block;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-soft);
  text-decoration: none;
  color: inherit;
  transition: border-color .2s ease, transform .2s ease, background-color .2s ease;
}

.page-about .closing-tile:hover,
.page-about .closing-tile:focus-visible {
  border-color: var(--brand-hi);
  transform: translateY(-3px);
  background: var(--panel);
}

.page-about .closing-tile--brand {
  border-color: rgba(255, 75, 31, .42);
  background: linear-gradient(150deg, rgba(255, 75, 31, .12), transparent 70%), var(--ink-soft);
}

.page-about .closing-tile__k {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--metal);
}

.page-about .closing-tile__t {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--white);
}

.page-about .closing-tile__d {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--metal);
}

/* ---------- 数字与通用 ---------- */

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .section-title.section-mark {
  position: relative;
  transition: color .16s ease;
}

.page-about .section-title.section-mark::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -10px;
  width: 0;
  height: 2px;
  background: var(--brand);
  transition: width .3s ease;
}

.page-about .section-title.section-mark.is-active::after {
  width: 68px;
}

.page-about .rule,
.page-about .rule--ticks {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 34px 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-masthead {
    padding: 46px 0 70px;
  }

  .page-about .masthead-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 30px;
  }

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

  .page-about .team-row {
    grid-template-columns: minmax(120px, 168px) 84px 1fr;
    grid-template-areas:
      "name count bar"
      "desc desc  desc";
    align-items: center;
    gap: 10px 20px;
  }

  .page-about .version-item {
    grid-template-columns: 132px 1fr;
    gap: 8px 26px;
    align-items: start;
  }

  .page-about .rhythm-layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about {
    padding-bottom: 120px;
  }

  .page-about .about-chronicle {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-top: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    max-height: calc(100vh - var(--header-h) - 48px);
    overflow-y: auto;
    scrollbar-width: none;
  }

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

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 0;
  }

  .page-about .rail-link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    padding: 11px 8px 11px 14px;
    white-space: normal;
    line-height: 1.4;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-left-color: var(--brand);
    background: rgba(255, 75, 31, .07);
  }

  .page-about .about-body {
    gap: 84px;
  }

  .page-about .about-section--flush {
    margin-top: -60px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-masthead h1 {
    max-width: 18ch;
  }

  .page-about .version-item--current {
    padding-left: 24px;
    padding-right: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }

  .page-about .about-masthead h1 {
    transform: none;
  }
}