.page-about {
  --about-line: rgba(127, 168, 180, 0.2);
  --about-line-strong: rgba(127, 168, 180, 0.42);
  --about-copper-soft: rgba(192, 138, 62, 0.36);
  --about-col-gap: clamp(28px, 4vw, 64px);
  display: block;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(24px, 3.6vw, 44px) clamp(40px, 5.5vw, 72px);
}

.page-about .about-hero__field {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(163deg, var(--ink) 0%, var(--ink) 45%, #101E2A 45.4%, var(--night) 100%);
}

.page-about .about-hero__field::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 78% at 84% 6%, rgba(192, 138, 62, 0.17), transparent 58%),
    radial-gradient(88% 62% at 6% 96%, rgba(127, 168, 180, 0.11), transparent 62%);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 var(--sp-3);
}

.page-about .about-hero__title {
  margin: 0 0 var(--sp-4);
  max-width: 17em;
  font-size: clamp(32px, 6.2vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  max-width: 40em;
  margin: 0 0 clamp(28px, 3.6vw, 44px);
  color: var(--text-soft);
}

.page-about .about-marks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-marks__item {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-marks__num {
  flex: 0 0 auto;
  min-width: 5.2em;
  color: var(--copper-pale);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 500;
}

.page-about .about-marks__label {
  color: var(--steel);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.page-about .about-hero__figure {
  margin-top: clamp(32px, 4.4vw, 56px);
}

.page-about .figure__frame {
  overflow: hidden;
  background: var(--film);
}

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

.page-about .figure__caption {
  margin-top: 12px;
  color: var(--steel);
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  position: relative;
  padding-block: clamp(40px, 5.6vw, 76px) clamp(40px, 5.6vw, 76px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(360px, 46%);
  height: 7px;
  background-image: repeating-linear-gradient(
    to right,
    var(--about-line-strong) 0 1px,
    transparent 1px 22px
  );
  pointer-events: none;
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-col-gap);
}

.page-about .about-flow {
  margin-top: var(--sp-4);
}

.page-about .about-flow p {
  margin: 0 0 1.05em;
}

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

/* ---------- 旁注 ---------- */

.page-about .about-note {
  padding-left: var(--sp-3);
  border-left: 2px solid var(--about-copper-soft);
}

.page-about .about-note--edge {
  padding: var(--sp-3) var(--sp-3) var(--sp-3) var(--sp-4);
  border-left: 2px solid var(--about-copper-soft);
  background: linear-gradient(180deg, rgba(36, 51, 63, 0.72), rgba(22, 36, 47, 0.4));
}

.page-about .about-note__label {
  margin: 0 0 10px;
  color: var(--copper);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-note__label--spaced {
  margin-top: var(--sp-4);
}

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

.page-about .about-note .ghost-link {
  display: inline-block;
  margin-top: var(--sp-3);
}

/* ---------- 五个大类 ---------- */

.page-about .cat-block {
  margin-top: clamp(28px, 3.6vw, 44px);
}

.page-about .cat-svg {
  display: block;
  width: 100%;
  height: 78px;
  stroke: var(--about-line-strong);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.page-about .cat-svg line:nth-child(2) {
  stroke: rgba(192, 138, 62, 0.5);
}

.page-about .cat-svg line:nth-child(4) {
  stroke: rgba(154, 59, 59, 0.5);
}

.page-about .cat-list {
  margin: var(--sp-3) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .cat-list__item {
  display: grid;
  grid-template-columns: 5em minmax(0, 1fr);
  gap: var(--sp-3);
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .cat-list__name {
  color: var(--paper);
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .cat-list__desc {
  color: var(--steel);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .cat-block__heading {
  margin: clamp(32px, 4vw, 52px) 0 0;
}

/* ---------- 季度刻度 ---------- */

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

.page-about .season-index__item {
  display: grid;
  grid-template-columns: 5.4em minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .season-index__code {
  color: var(--copper-pale);
  font-size: 14px;
}

.page-about .season-index__note {
  color: var(--steel);
  font-size: 13px;
  line-height: 1.7;
  transition: color 0.3s var(--ease-water);
}

.page-about .about-figure {
  margin: 0 0 var(--sp-4);
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .season-index__note {
    color: rgba(147, 162, 174, 0.5);
  }

  .page-about .season-index__item:hover .season-index__note,
  .page-about .season-index__item:focus-within .season-index__note {
    color: var(--steel);
  }
}

/* ---------- 章节抬头 ---------- */

.page-about .about-headline {
  max-width: 46em;
}

.page-about .about-headline__lead {
  margin: var(--sp-3) 0 0;
  color: var(--text-soft);
}

/* ---------- 团队分工 ---------- */

.page-about .roles {
  margin-top: clamp(32px, 4.4vw, 56px);
  border-top: 1px solid var(--about-line);
}

.page-about .roles__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px var(--sp-4);
  padding: clamp(22px, 3vw, 34px) 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .roles__count {
  margin: 0;
  color: var(--copper-pale);
  font-size: clamp(38px, 7vw, 54px);
  font-weight: 500;
  line-height: 1;
}

.page-about .roles__role {
  margin: 0;
  color: var(--paper);
  font-family: var(--font-head);
  font-size: clamp(19px, 2.4vw, 22px);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .roles__desc {
  margin: 0;
  max-width: 42em;
  color: var(--steel);
  font-size: 15px;
  line-height: 1.8;
}

@media (min-width: 760px) {
  .page-about .roles__row {
    grid-template-columns: 5.5em 7em minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .roles__desc {
    grid-column: 3;
  }
}

/* ---------- 运营节奏 ---------- */

.page-about .rhythm {
  margin: var(--sp-4) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .rhythm__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .rhythm__time {
  color: var(--copper);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 500;
}

.page-about .rhythm__name {
  margin: 0 0 6px;
  color: var(--paper);
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
}

.page-about .rhythm__desc {
  margin: 0;
  max-width: 40em;
  color: var(--steel);
  font-size: 15px;
  line-height: 1.8;
}

@media (min-width: 700px) {
  .page-about .rhythm__item {
    grid-template-columns: 7.5em minmax(0, 1fr);
    gap: var(--sp-4);
    align-items: start;
  }
}

/* ---------- 协作生态 ---------- */

.page-about .collab {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(32px, 4.4vw, 56px);
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .collab__card {
  padding: clamp(24px, 3.2vw, 40px) clamp(20px, 2.6vw, 32px);
  background: var(--ink);
}

.page-about .collab__card:nth-child(2) {
  background: var(--night);
}

.page-about .collab__idx {
  margin: 0 0 var(--sp-3);
  color: var(--copper);
  font-size: 13px;
  letter-spacing: 0.18em;
}

.page-about .collab__name {
  margin: 0 0 10px;
  color: var(--paper);
  font-family: var(--font-head);
  font-size: clamp(19px, 2.4vw, 22px);
  font-weight: 600;
}

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

@media (min-width: 860px) {
  .page-about .collab {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 服务数据 ---------- */

.page-about .service-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: clamp(28px, 3.6vw, 44px);
  border-top: 1px solid var(--about-line-strong);
}

.page-about .service-strip__cell {
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .service-strip__num {
  margin: 0 0 6px;
  color: var(--paper);
  font-size: clamp(28px, 4.6vw, 40px);
  font-weight: 500;
  line-height: 1;
}

.page-about .service-strip__label {
  margin: 0;
  color: var(--steel);
  font-size: 13px;
  letter-spacing: 0.02em;
}

@media (min-width: 700px) {
  .page-about .service-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .service-strip__cell {
    padding: 20px var(--sp-4) 20px 0;
    border-bottom: 0;
    border-right: 1px solid var(--about-line);
  }

  .page-about .service-strip__cell:last-child {
    border-right: 0;
    padding-right: 0;
  }
}

.page-about .hours {
  margin: 0 0 var(--sp-3);
  padding: 0;
  list-style: none;
}

.page-about .hours__item {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px var(--sp-3);
  padding: 9px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .hours__day {
  color: var(--paper);
  font-size: 14px;
}

.page-about .hours__time {
  color: var(--copper-pale);
  font-size: 14px;
}

/* ---------- 收束 ---------- */

.page-about .about-chapter--close {
  border-top: 1px solid var(--about-line);
  background:
    radial-gradient(110% 130% at 88% 10%, rgba(192, 138, 62, 0.12), transparent 60%),
    linear-gradient(180deg, rgba(22, 36, 47, 0.55), rgba(10, 26, 40, 0));
}

.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 48px);
  align-items: end;
}

.page-about .about-next__text {
  margin: var(--sp-3) 0 0;
  color: var(--text-soft);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2) var(--sp-3);
}

@media (min-width: 900px) {
  .page-about .about-next {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-next__links {
    justify-content: flex-end;
  }
}

/* ---------- 桌面端两栏 ---------- */

@media (min-width: 900px) {
  .page-about .about-grid {
    grid-template-columns: minmax(0, 1.85fr) minmax(0, 1fr);
  }

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

  .page-about .about-grid__side--sticky {
    position: sticky;
    top: clamp(72px, 10vh, 110px);
    align-self: start;
  }

  .page-about .about-marks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 0;
  }

  .page-about .about-marks__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 0 var(--sp-4) 0 0;
    border-bottom: 0;
    border-top: 1px solid var(--about-line-strong);
    padding-top: 16px;
  }

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

/* ---------- 进入视口 ---------- */

.page-about [data-reveal].is-primed {
  opacity: 0;
  transform: translateY(16px);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition:
    opacity 0.65s var(--ease-water),
    transform 0.65s var(--ease-water);
}

.page-about .roles__count.is-primed {
  transform: translateY(16px) scale(0.94);
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal].is-primed {
    opacity: 1;
    transform: none;
  }

  .page-about .season-index__note {
    transition: none;
  }
}

/* ---------- 窄屏兜底 ---------- */

@media (max-width: 480px) {
  .page-about .cat-list__item,
  .page-about .season-index__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .page-about .cat-svg {
    height: 60px;
  }
}