.page-about {
  --about-line: rgba(138, 160, 180, .3);
  --about-body: #D7E2EC;
  --about-paper-text: #33281D;
  display: block;
  background: var(--ink-night);
  color: var(--chalk-white);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: var(--bw) solid var(--ink-brown);
  background: radial-gradient(120% 90% at 82% 12%, rgba(16, 42, 67, .95) 0%, rgba(11, 27, 43, 1) 62%);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .22;
  filter: saturate(.55) contrast(1.08);
}

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

.page-about .about-hero__inner {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(46px, 8vw, 104px) var(--gutter) clamp(32px, 5vw, 60px);
}

.page-about .about-hero__kicker {
  margin: 20px 0 0;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--flash-orange);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(40px, 8.4vw, 104px);
  line-height: .98;
  letter-spacing: -.02em;
  text-transform: none;
}

.page-about .about-hero__lead {
  max-width: 56ch;
  margin: 24px 0 0;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 赛季刻度带 ---------- */

.page-about .about-scale {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 var(--gutter);
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(112px, 1fr);
  overflow-x: auto;
  border-top: 1px solid var(--about-line);
  background: rgba(16, 42, 67, .68);
  scrollbar-width: thin;
  scrollbar-color: var(--flash-orange) transparent;
}

.page-about .about-scale__item {
  position: relative;
  min-width: 0;
  padding: 16px 14px 54px;
  border-right: 1px solid var(--about-line);
}

.page-about .about-scale__item:last-child {
  border-right: 0;
}

.page-about .about-scale__item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 14px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--signal-green);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, .16);
}

.page-about .about-scale__no {
  display: block;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--signal-green);
}

.page-about .about-scale__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--mist-blue);
}

.page-about .about-scale__tip {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 14px;
  font-size: 11px;
  line-height: 1.5;
  color: var(--paper-cream);
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-scale__item:hover .about-scale__tip,
.page-about .about-scale__item:focus-within .about-scale__tip {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 阶段筛选 ---------- */

.page-about .about-filter {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 24px var(--gutter) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

.page-about .about-filter__label {
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--mist-blue);
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .filter-chip {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  padding: 8px 18px;
  border: 2px solid var(--ink-brown);
  background: var(--paper-cream);
  color: var(--ink-brown);
  box-shadow: 4px 4px 0 var(--ink-brown);
  cursor: pointer;
  transition: transform .16s var(--ease), box-shadow .16s var(--ease);
}

.page-about .filter-chip:hover {
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 var(--ink-brown);
}

.page-about .filter-chip[aria-pressed="true"] {
  background: var(--flash-orange);
  box-shadow: 2px 2px 0 var(--ink-brown);
  transform: translate(2px, 2px);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding: clamp(44px, 6.5vw, 88px) var(--gutter);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-section--shade {
  background: rgba(16, 42, 67, .42);
}

.page-about .about-section--edge {
  border-bottom: 0;
  background: linear-gradient(180deg, rgba(11, 27, 43, 1) 0%, rgba(16, 42, 67, .55) 100%);
}

.page-about .about-cols {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-main {
  min-width: 0;
}

.page-about .sec-title {
  margin: 10px 0 0;
}

.page-about .about-lede {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-line);
  max-width: 44ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 27px);
  line-height: 1.42;
  letter-spacing: -.005em;
  color: var(--chalk-white);
}

.page-about .about-body {
  margin-top: 24px;
  max-width: 68ch;
}

.page-about .about-body p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--about-body);
}

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

.page-about .about-body a,
.page-about .about-timeline__body a {
  color: var(--signal-green);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* ---------- 旁注 ---------- */

.page-about .about-side {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-note {
  background: var(--paper-cream);
  color: var(--about-paper-text);
  border: var(--bw) solid var(--ink-brown);
  border-left-width: 8px;
  border-left-color: var(--ember-red);
  box-shadow: 6px 6px 0 var(--shadow-night);
  padding: 18px 20px;
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.85;
}

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

.page-about .about-note__head {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--ember-red);
}

.page-about .about-note__inline {
  margin: 24px 0 0;
  padding: 16px 18px;
  max-width: 66ch;
  background: rgba(200, 255, 61, .07);
  border-left: 4px solid var(--signal-green);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 22px;
  border-left: 2px solid var(--paper-shade);
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 16px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-night);
  border: 2px solid var(--signal-green);
}

.page-about .about-timeline__det {
  border: var(--bw) solid var(--ink-brown);
  background: var(--paper-cream);
  color: var(--about-paper-text);
  box-shadow: var(--shadow-hard);
}

.page-about .about-timeline__det > summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 10px 14px;
  padding: 14px 16px;
}

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

.page-about .about-timeline__no {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--ember-red);
  white-space: nowrap;
}

.page-about .about-timeline__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  color: var(--ink-brown);
}

.page-about .about-timeline__sign::before {
  content: "+";
  display: block;
  width: 22px;
  height: 22px;
  line-height: 20px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--paper-cream);
  background: var(--ink-brown);
}

.page-about .about-timeline__det[open] .about-timeline__sign::before {
  content: "–";
  background: var(--flash-orange);
  color: var(--ink-brown);
}

.page-about .about-timeline__body {
  padding: 0 16px 16px;
  border-top: 1px dashed rgba(74, 58, 42, .45);
  margin-top: 0;
  padding-top: 14px;
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: #43362A;
}

.page-about .about-timeline__body a {
  color: #8A2E12;
  text-decoration-color: var(--ember-red);
}

/* ---------- 三步核对流程 ---------- */

.page-about .about-flow__map {
  display: block;
  width: 100%;
  max-width: 460px;
  height: auto;
  margin: 26px 0 6px;
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-flow__no {
  font-size: 26px;
  line-height: 1;
  color: var(--flash-orange);
  letter-spacing: -.02em;
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--chalk-white);
}

.page-about .about-flow__text p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body);
  max-width: 64ch;
}

.page-about .about-flow__eg {
  margin: 0;
  display: inline-block;
  padding: 6px 12px;
  font-size: 12.5px;
  color: var(--signal-green);
  background: rgba(200, 255, 61, .08);
  border-left: 3px solid var(--signal-green);
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  margin-top: 28px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--chalk-white);
}

.page-about .about-team__count {
  font-size: 22px;
  line-height: 1;
  color: var(--flash-orange);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 图片容器 ---------- */

.page-about .about-figure {
  margin: 0;
  background: var(--stand-blue);
  border: var(--bw) solid var(--ink-brown);
  box-shadow: var(--shadow-hard);
}

.page-about .about-figure--wide {
  margin-top: 28px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 10;
}

.page-about .about-figure__cap {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--mist-blue);
  background: rgba(11, 27, 43, .92);
  border-top: 2px solid var(--ink-brown);
}

/* ---------- 内容边界 ---------- */

.page-about .about-bound {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-bound__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-bound__no {
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--ember-red);
  letter-spacing: .04em;
}

.page-about .about-bound__item p {
  margin: 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-bound__item a {
  color: var(--signal-green);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .about-exits {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 回到顶部 ---------- */

.page-about .about-top {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  font-size: 18px;
  line-height: 1;
  color: var(--ink-brown);
  background: var(--paper-cream);
  border: var(--bw) solid var(--ink-brown);
  box-shadow: 5px 5px 0 var(--shadow-night);
  text-decoration: none;
  transition: transform .16s var(--ease), box-shadow .16s var(--ease);
}

.page-about .about-top:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--shadow-night);
}

.page-about .about-top__text {
  font-size: 11.5px;
  letter-spacing: .16em;
}

/* ---------- 屏幕适配 ---------- */

@media (min-width: 700px) {
  .page-about .about-team__row {
    grid-template-columns: 150px 78px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }

  .page-about .about-flow__step {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .about-bound__item {
    grid-template-columns: 72px minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__rule {
    display: block;
    position: absolute;
    right: 7%;
    top: 24%;
    width: 210px;
    height: 14px;
    background: var(--flash-orange);
    box-shadow: 0 0 0 3px var(--ink-brown);
    transform: rotate(-7deg);
    z-index: -1;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: 96px;
  }

  .page-about .about-lede {
    font-size: clamp(20px, 2.2vw, 26px);
  }
}

@media (max-width: 420px) {
  .page-about .about-timeline {
    padding-left: 14px;
  }

  .page-about .about-timeline__item::before {
    left: -22px;
    width: 10px;
    height: 10px;
  }

  .page-about .about-timeline__det > summary {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 6px 10px;
  }

  .page-about .about-timeline__no {
    grid-column: 1 / -1;
  }

  .page-about .about-bound__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }
}
<<<END>>>