.page-about {
  background-color: var(--ink);
  color: var(--silver);
  font-family: var(--font-body);
  line-height: 1.75;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--silver);
}

.page-about p {
  margin: 0 0 1em;
}

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

.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  margin: 0 0 clamp(22px, 4vw, 36px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver-dim);
}

.page-about .about-crumbs li {
  display: flex;
  align-items: center;
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--track);
}

.page-about .about-crumbs a {
  color: var(--silver-dim);
  text-decoration: none;
  transition: color 0.18s ease;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--silver);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 48px) 0 clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--track);
  background:
    radial-gradient(120% 90% at 86% 0%, rgba(61, 224, 232, 0.16), transparent 55%),
    radial-gradient(90% 80% at 0% 100%, rgba(226, 69, 61, 0.12), transparent 60%),
    var(--ink);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(232, 237, 245, 0.035) 0 1px,
    transparent 1px 64px
  );
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 44px);
  align-items: end;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ember);
}

.page-about .about-kicker::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--ember);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.5vw, 26px);
  font-size: clamp(34px, 6.6vw, 78px);
  line-height: 1.02;
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 0 0 clamp(22px, 3vw, 30px);
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.85;
  color: rgba(232, 237, 245, 0.78);
}

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

/* ---------- 按钮 ---------- */
.page-about .about-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border: 1px solid var(--track);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--silver);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.page-about .about-btn:hover,
.page-about .about-btn:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-1px);
}

.page-about .about-btn--primary {
  border-color: var(--cyan);
  background: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-btn--primary:hover,
.page-about .about-btn--primary:focus-visible {
  border-color: var(--silver);
  background: var(--silver);
  color: var(--ink);
}

/* ---------- 概览面板 ---------- */
.page-about .about-snapshot {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--track);
  border-radius: var(--radius-l);
  background: linear-gradient(160deg, rgba(18, 26, 58, 0.94), rgba(11, 16, 38, 0.94));
}

.page-about .about-snapshot__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--silver-dim);
}

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

.page-about .about-snapshot__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(42, 51, 85, 0.9);
}

.page-about .about-snapshot__list li:first-child {
  padding-top: 0;
}

.page-about .about-snapshot__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-snapshot__num {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-snapshot__label {
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--silver-dim);
  text-align: right;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 44px);
  padding-top: clamp(36px, 6vw, 68px);
  padding-bottom: clamp(48px, 7vw, 88px);
}

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

/* ---------- 目录索引 ---------- */
.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--silver-dim);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--silver-dim);
  font-size: 13.5px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--cyan);
  border-color: rgba(61, 224, 232, 0.4);
  background: rgba(61, 224, 232, 0.07);
}

.page-about .about-index__num {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ember);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--track);
}

.page-about .about-section + .about-section {
  margin-top: clamp(38px, 6vw, 64px);
}

.page-about .about-stream > .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section__eyebrow {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--ember);
}

.page-about .about-section h2 {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-size: clamp(25px, 3.4vw, 40px);
}

.page-about .about-section__lede {
  max-width: 60ch;
  margin-bottom: clamp(20px, 3vw, 28px);
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.8;
  color: rgba(232, 237, 245, 0.8);
}

.page-about .about-cols p {
  color: rgba(232, 237, 245, 0.78);
}

/* ---------- 三条线卡片 ---------- */
.page-about .line-cards {
  display: grid;
  gap: clamp(12px, 2vw, 16px);
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .line-card {
  position: relative;
  padding: 20px 18px;
  border: 1px solid var(--track);
  border-radius: var(--radius-m);
  background: var(--ink-2);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: -1px;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--cyan);
}

.page-about .line-card--track::before {
  background: linear-gradient(180deg, var(--arcade-a), var(--arcade-b));
}

.page-about .line-card--lib::before {
  background: var(--gold);
}

.page-about .line-card:hover {
  transform: translateY(-2px);
  border-color: rgba(61, 224, 232, 0.45);
}

.page-about .line-card__tag {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ember);
}

.page-about .line-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.page-about .line-card p:last-child {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 237, 245, 0.74);
}

/* ---------- 图文 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--track);
  border-radius: var(--radius-l);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 13px;
  line-height: 1.65;
  color: var(--silver-dim);
}

/* ---------- 方法注释 ---------- */
.page-about .about-notes {
  display: grid;
  gap: 16px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-notes li {
  padding-top: 12px;
  border-top: 2px solid var(--track);
}

.page-about .about-notes__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--silver);
}

.page-about .about-notes p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 237, 245, 0.76);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(12px, 2vw, 16px);
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-card {
  padding: 20px 18px;
  border: 1px solid var(--track);
  border-radius: var(--radius-m);
  background: var(--ink-2);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .team-card:hover {
  transform: translateY(-2px);
  border-color: rgba(61, 224, 232, 0.5);
  box-shadow: 0 14px 32px rgba(11, 16, 38, 0.55);
}

.page-about .team-card__count {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .team-card__name {
  margin: 0 0 8px;
  font-size: 19px;
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 237, 245, 0.74);
}

/* ---------- 年份线 ---------- */
.page-about .year-list {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--track);
}

.page-about .year-list__item {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 22px) 0;
  border-bottom: 1px solid var(--track);
}

.page-about .year-list__year {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--silver-dim);
  transition: color 0.2s ease;
}

.page-about .year-list__item:hover .year-list__year {
  color: var(--cyan);
}

.page-about .year-list__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.page-about .year-list__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 237, 245, 0.74);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence-list {
  display: grid;
  gap: clamp(12px, 2vw, 16px);
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cadence {
  padding: 18px;
  border: 1px solid var(--track);
  border-top-width: 3px;
  border-top-color: var(--cyan);
  border-radius: var(--radius-m);
  background: var(--ink-2);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .cadence:nth-child(2) {
  border-top-color: var(--ember);
}

.page-about .cadence:nth-child(3) {
  border-top-color: var(--arcade-a);
}

.page-about .cadence:nth-child(4) {
  border-top-color: var(--gold);
}

.page-about .cadence:hover {
  transform: translateY(-2px);
}

.page-about .cadence__tag {
  display: inline-block;
  margin: 0 0 10px;
  padding: 3px 12px;
  border: 1px solid var(--track);
  border-radius: var(--radius-pill);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--silver-dim);
}

.page-about .cadence h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.page-about .cadence p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 237, 245, 0.74);
}

/* ---------- 合作说明 ---------- */
.page-about .partner-note {
  margin-top: clamp(24px, 3.5vw, 36px);
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--track);
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, rgba(31, 77, 59, 0.6), rgba(18, 26, 58, 0.92));
}

.page-about .partner-note h3 {
  margin: 0 0 10px;
  font-size: 19px;
}

.page-about .partner-note p {
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(232, 237, 245, 0.82);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  grid-column: 1 / -1;
  padding: clamp(26px, 4.5vw, 48px);
  border-radius: var(--radius-l);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-cta__eyebrow {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--ember);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-cta__body {
  max-width: 54ch;
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(11, 16, 38, 0.78);
}

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

.page-about .about-cta .about-btn {
  border-color: rgba(11, 16, 38, 0.24);
  color: var(--ink);
}

.page-about .about-cta .about-btn:hover,
.page-about .about-cta .about-btn:focus-visible {
  border-color: var(--ink);
  background: rgba(11, 16, 38, 0.06);
  color: var(--ink);
}

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

.page-about .about-cta .about-btn--primary:hover,
.page-about .about-cta .about-btn--primary:focus-visible {
  border-color: var(--table);
  background: var(--table);
  color: var(--paper);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .line-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .year-list__item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 32px);
    align-items: start;
  }
}

@media (min-width: 760px) {
  .page-about .about-cols {
    columns: 2;
    column-gap: clamp(26px, 4vw, 48px);
  }

  .page-about .about-cols p {
    break-inside: avoid;
  }

  .page-about .about-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 820px) {
  .page-about .about-figure--method {
    width: 84%;
    margin-left: auto;
  }

  .page-about .about-figure--team {
    width: 92%;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 64px);
    align-items: start;
  }

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

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list a {
    padding: 9px 12px;
    border-radius: var(--radius-s);
    white-space: normal;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 72px);
  }
}
<<<END>>>