.page-about {
  --about-edge: rgba(126, 147, 168, 0.22);
  --about-paper-line: rgba(26, 20, 16, 0.16);
  background: var(--ink-950);
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
}

/* ---------- 品牌带 ---------- */
.page-about .about-band {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 7vw, 92px) 0 clamp(36px, 5vw, 68px);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(14, 36, 64, 0.95) 0%, rgba(6, 20, 38, 0) 62%),
    var(--ink-950);
  border-bottom: 1px solid var(--line-cool);
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: 58%;
  height: 138%;
  transform: skewX(-15deg);
  background: linear-gradient(158deg, rgba(53, 242, 208, 0.13) 0%, rgba(255, 106, 43, 0.09) 48%, rgba(6, 20, 38, 0) 74%);
  pointer-events: none;
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(320px, 42%);
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--orange) 100%);
}

.page-about .about-band__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  align-items: center;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.page-about .about-band__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 6.2vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--text-strong);
}

.page-about .about-band__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--text-body);
}

.page-about .about-band__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 4vw, 40px);
  margin: 28px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-cool);
}

.page-about .about-band__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-band__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-band__unit {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-quiet);
}

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

.page-about .about-band__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border: 1px solid var(--line-cool);
}

.page-about .about-band__figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-quiet);
}

/* ---------- 外壳与章节索引 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  padding-block: clamp(40px, 6vw, 76px) clamp(56px, 8vw, 104px);
}

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

.page-about .about-index__head {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-index__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 16px;
  list-style: none;
}

.page-about .about-index__list::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-cool);
}

.page-about .about-index__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 44px;
  padding: 8px 0;
  color: var(--text-quiet);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .about-index__link::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 17px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--line-cool);
  border-radius: 50%;
  background: var(--ink-950);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--text-strong);
}

.page-about .about-index__link:hover::before,
.page-about .about-index__link:focus-visible::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .about-index__label {
  font-size: 14px;
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-chapter {
  position: relative;
  padding: clamp(24px, 3.6vw, 44px);
  border: 1px solid var(--line-cool);
  background: var(--ink-900);
}

.page-about .about-chapter__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--text-strong);
}

.page-about .about-chapter p {
  margin: 0 0 14px;
  line-height: 1.8;
}

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

.page-about .about-chapter a:not(.btn) {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-chapter--paper {
  background: var(--paper);
  border-color: rgba(26, 20, 16, 0.18);
  color: rgba(26, 20, 16, 0.78);
}

.page-about .about-chapter--paper .about-kicker {
  color: var(--red);
}

.page-about .about-chapter--paper .about-chapter__title {
  color: var(--press);
}

.page-about .about-chapter--paper a:not(.btn) {
  color: var(--red);
}

/* ---------- 团队三组 ---------- */
.page-about .about-crews {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-crew {
  display: flex;
  flex-direction: column;
  padding: 20px 18px 22px;
  background: var(--ink-900);
  border: 1px solid rgba(26, 20, 16, 0.22);
  color: var(--text-body);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-crew:hover {
  background: var(--ink-850);
  box-shadow: inset 0 0 0 1px var(--line-cyan);
}

.page-about .about-crew__idx {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-crew__count {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(38px, 5vw, 54px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-crew__count span {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-quiet);
}

.page-about .about-crew__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  color: var(--text-strong);
}

.page-about .about-crew__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
}

/* ---------- 周历排班 ---------- */
.page-about .about-calendar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line-cool);
  border: 1px solid var(--line-cool);
}

.page-about .about-calendar__day {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--ink-900);
  transition: background 0.2s var(--ease);
}

.page-about .about-calendar__day:hover {
  background: var(--ink-850);
}

.page-about .about-calendar__dow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-strong);
}

.page-about .about-calendar__dot {
  width: 22px;
  height: 4px;
  background: var(--mist);
}

.page-about .about-calendar__day--live .about-calendar__dot {
  background: var(--orange);
}

.page-about .about-calendar__day--prep .about-calendar__dot {
  background: var(--cyan);
}

.page-about .about-calendar__name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-strong);
}

.page-about .about-calendar__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-quiet);
}

.page-about .about-calendar__desc a {
  color: var(--cyan);
}

/* ---------- 流程 ---------- */
.page-about .about-pipeline {
  display: grid;
  gap: 26px;
  margin-top: 22px;
}

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

.page-about .about-pipeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-paper-line);
}

.page-about .about-pipeline__figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(26, 20, 16, 0.6);
}

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

.page-about .about-steps__item {
  position: relative;
  padding: 0 0 22px 46px;
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 26px;
  bottom: 0;
  width: 1px;
  background: var(--about-paper-line);
}

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

.page-about .about-steps__item:last-child::before {
  display: none;
}

.page-about .about-steps__num {
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--red);
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.3;
  color: var(--press);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 阅读标准 ---------- */
.page-about .about-standards {
  margin: 24px 0 0;
  border-top: 1px solid var(--line-cool);
}

.page-about .about-standards__row {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-cool);
}

.page-about .about-standards dt {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-standards dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
}

/* ---------- 时间线 ---------- */
.page-about .about-chapter--night {
  overflow: hidden;
  background: var(--ink-900);
  border-color: var(--line-cyan);
}

.page-about .about-chapter__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  filter: saturate(0.7);
}

.page-about .about-chapter--night::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 20, 38, 0.9) 0%, rgba(6, 20, 38, 0.66) 45%, rgba(6, 20, 38, 0.94) 100%);
}

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

.page-about .about-years {
  display: grid;
  gap: 20px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-years__item {
  position: relative;
  padding-top: 16px;
  border-top: 1px solid var(--line-cool);
}

.page-about .about-years__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 26px;
  height: 2px;
  background: var(--cyan);
  transition: width 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-years__item:hover::before,
.page-about .about-years__item:focus-within::before {
  width: 56px;
  background: var(--orange);
}

.page-about .about-years__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--text-strong);
}

.page-about .about-years__title {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.3;
  color: var(--cyan);
}

.page-about .about-years__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-quiet);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.24s var(--ease), opacity 0.24s var(--ease);
}

.page-about .about-years__item:hover .about-years__note,
.page-about .about-years__item:focus-within .about-years__note,
.page-about .about-years__note.is-open {
  max-height: 8em;
  opacity: 1;
}

/* ---------- 反馈 ---------- */
.page-about .about-promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-promise__actions .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.page-about .about-promise__actions .btn--line {
  color: var(--press);
  border-color: rgba(26, 20, 16, 0.32);
}

.page-about .about-promise__actions .btn--line:hover,
.page-about .about-promise__actions .btn--line:focus-visible {
  border-color: var(--press);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-calendar {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-crew--a {
    grid-column: span 2;
  }

  .page-about .about-pipeline {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    align-items: start;
    gap: 32px;
  }

  .page-about .about-standards__row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-years {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-band__inner {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.72fr);
  }

  .page-about .about-calendar {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .page-about .about-calendar__day {
    padding: 16px 11px 20px;
  }

  .page-about .about-crews {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-crew--a {
    grid-column: span 5;
  }

  .page-about .about-crew--b {
    grid-column: span 4;
  }

  .page-about .about-crew--c {
    grid-column: span 3;
  }

  .page-about .about-years {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-years__item:nth-child(2) {
    margin-top: 24px;
  }

  .page-about .about-years__item:nth-child(3) {
    margin-top: 8px;
  }

  .page-about .about-years__item:nth-child(4) {
    margin-top: 32px;
  }

  .page-about .about-years__item:nth-child(5) {
    margin-top: 14px;
  }

  .page-about .about-years__item:nth-child(6) {
    margin-top: 28px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew,
  .page-about .about-calendar__day,
  .page-about .about-index__link::before,
  .page-about .about-years__item::before,
  .page-about .about-years__note {
    transition: none;
  }
}
<<<END>>>