.page-about {
  --about-pad: clamp(40px, 7vw, 88px);
  --about-gap: clamp(20px, 3vw, 36px);
  display: block;
}

/* ---------- Hero ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 44px;
  background:
    radial-gradient(110% 84% at 6% -12%, rgba(47, 227, 208, 0.11), transparent 62%),
    radial-gradient(80% 72% at 98% 2%, rgba(91, 107, 255, 0.14), transparent 66%),
    var(--c-night);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 25% 100%;
  opacity: 0.32;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: 20px;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 8.4vw, 64px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: 0.075em;
  color: var(--c-lamp);
}

.page-about .about-hero__lede {
  margin: 2px 0 0;
  max-width: 60ch;
  color: var(--c-haze);
}

.page-about .about-stats {
  margin: 0;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(22, 38, 63, 0.92), rgba(14, 26, 46, 0.92));
  align-self: end;
}

.page-about .about-stats__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stats__row:last-child {
  border-bottom: 0;
}

.page-about .about-stats__label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-haze);
}

.page-about .about-stats__value {
  margin: 0;
  font-size: 23px;
  font-weight: 700;
  color: var(--c-cyan);
  text-shadow: var(--glow-cyan);
}

.page-about .about-stats__unit {
  margin-left: 2px;
  font-size: 13px;
  color: var(--c-haze);
  text-shadow: none;
}

/* ---------- 章节底色节奏 ---------- */

.page-about .about-origin,
.page-about .about-shift,
.page-about .about-crew {
  padding: var(--about-pad) 0;
  background: var(--c-indigo);
}

.page-about .about-audience,
.page-about .about-season {
  padding: var(--about-pad) 0;
  background: var(--c-night);
}

/* ---------- 起点 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-origin__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 5.6vw, 40px);
  line-height: 1.2;
  letter-spacing: 0.06em;
  color: var(--c-lamp);
}

.page-about .about-origin__prose {
  margin-top: 20px;
}

.page-about .about-origin__prose p {
  margin: 0 0 16px;
  color: var(--c-lamp);
}

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

.page-about .about-quote {
  margin: 28px 0 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--c-cyan);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 3.6vw, 26px);
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--c-lamp);
}

.page-about .about-origin__note {
  margin-top: 22px;
}

/* ---------- 图片容器 ---------- */

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

.page-about .about-figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--c-stand);
  box-shadow: 6px 6px 0 rgba(7, 13, 24, 0.55);
}

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

.page-about .about-figure .figure__caption {
  margin-top: 10px;
}

/* ---------- 服务对象 ---------- */

.page-about .audience-grid {
  list-style: none;
  display: grid;
  gap: 16px;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .audience-grid__item {
  position: relative;
  padding: 22px 18px 20px;
  background: var(--c-stand);
  border: 1px solid var(--line);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .audience-grid__item:hover,
.page-about .audience-grid__item:focus-within {
  transform: translateY(-2px);
  border-color: rgba(47, 227, 208, 0.5);
  box-shadow: 0 12px 28px rgba(7, 13, 24, 0.6);
}

.page-about .audience-grid__num {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--c-amber);
}

.page-about .audience-grid__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.04em;
  color: var(--c-lamp);
}

.page-about .audience-grid__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-haze);
}

/* ---------- 工作流程 ---------- */

.page-about .workflow {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .workflow__step {
  position: relative;
  padding: 20px 18px;
  background: var(--c-stand);
  border: 1px solid var(--line);
  border-top: 2px solid rgba(47, 227, 208, 0.5);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .workflow__step::after {
  content: "↓";
  position: absolute;
  left: 50%;
  bottom: -20px;
  transform: translateX(-50%);
  font-size: 14px;
  line-height: 1;
  color: var(--c-haze);
}

.page-about .workflow__step:last-child::after {
  content: none;
}

.page-about .workflow__step:hover,
.page-about .workflow__step:focus-within {
  transform: translateY(-2px);
  border-color: rgba(47, 227, 208, 0.55);
  box-shadow: 0 12px 30px rgba(7, 13, 24, 0.6);
}

.page-about .workflow__index {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .workflow__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.03em;
  color: var(--c-lamp);
}

.page-about .workflow__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-haze);
}

.page-about .workflow__tools {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-haze);
  opacity: 0.72;
  transition: opacity 180ms var(--ease), color 180ms var(--ease);
}

.page-about .workflow__step:hover .workflow__tools,
.page-about .workflow__step:focus-within .workflow__tools {
  opacity: 1;
  color: var(--c-cyan);
}

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

.page-about .about-shift__foot {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-shift__foot p {
  margin: 0;
  max-width: 74ch;
  color: var(--c-lamp);
}

.page-about .about-shift__foot .note {
  margin-top: 14px;
}

/* ---------- 赛季时间线 ---------- */

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

.page-about .season-line__item {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 22px;
}

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

.page-about .season-line__marker {
  position: relative;
  padding: 6px 0 0 22px;
}

.page-about .season-line__marker::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: -22px;
  width: 1px;
  background: var(--line);
}

.page-about .season-line__item:last-child .season-line__marker::before {
  content: none;
}

.page-about .season-line__dot {
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-amber);
  box-shadow: var(--glow-amber);
}

.page-about .season-line__item--open .season-line__dot {
  background: transparent;
  border: 1px solid var(--c-amber);
  box-shadow: none;
}

.page-about .season-line__year {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-haze);
}

.page-about .season-line__item--open .season-line__year {
  color: var(--c-amber);
}

.page-about .season-line__trigger {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--c-amber);
  background: var(--c-stand);
  color: var(--c-lamp);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), background 180ms var(--ease);
}

.page-about .season-line__trigger:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  border-left-color: var(--c-amber);
  background: rgba(22, 38, 63, 0.9);
}

.page-about .season-line__trigger:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-about .season-line__headline {
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.03em;
}

.page-about .season-line__chev {
  flex: none;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-cyan);
}

.page-about .season-line__chev::before {
  content: "＋";
}

.page-about .season-line__trigger[aria-expanded="true"] .season-line__chev::before {
  content: "－";
}

.page-about .season-line__panel {
  padding: 16px;
  border: 1px solid var(--line);
  border-top: 0;
  background: rgba(7, 13, 24, 0.5);
}

.page-about .season-line__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-haze);
}

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

/* ---------- 上海 ---------- */

.page-about .about-city {
  position: relative;
  overflow: hidden;
  padding: var(--about-pad) 0;
  background: var(--c-night);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-city__media {
  position: absolute;
  inset: 0;
}

.page-about .about-city__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.page-about .about-city::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--c-night) 0%, rgba(7, 13, 24, 0.66) 42%, var(--c-night) 100%);
  pointer-events: none;
}

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

.page-about .about-city__head {
  margin-bottom: 8px;
}

.page-about .city-clock {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .city-clock__row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .city-clock__time {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-cyan);
  text-shadow: var(--glow-cyan);
}

.page-about .city-clock__desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-lamp);
}

.page-about .about-city__text {
  margin: 26px 0 0;
  max-width: 68ch;
  color: var(--c-haze);
}

/* ---------- 合作生态 ---------- */

.page-about .crew-cloud {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .crew-cloud__tag {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  background: rgba(22, 38, 63, 0.72);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), background 180ms var(--ease);
}

.page-about .crew-cloud__tag:hover {
  transform: translateY(-2px);
  border-color: rgba(245, 166, 35, 0.6);
  background: rgba(22, 38, 63, 0.95);
}

.page-about .crew-cloud__name {
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--c-lamp);
}

.page-about .crew-cloud__meta {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .crew-cloud__since {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-haze);
  opacity: 0.7;
  transition: opacity 180ms var(--ease), color 180ms var(--ease);
}

.page-about .crew-cloud__tag:hover .crew-cloud__since {
  opacity: 1;
  color: var(--c-amber);
}

.page-about .about-crew__text {
  margin: 28px 0 0;
  max-width: 72ch;
  color: var(--c-lamp);
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  padding: var(--about-pad) 0;
  background: var(--c-night);
}

.page-about .about-next__inner {
  display: grid;
  gap: 22px;
  padding: 26px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--c-cyan);
  background: linear-gradient(120deg, rgba(22, 38, 63, 0.95), rgba(14, 26, 46, 0.95));
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 4vw, 28px);
  letter-spacing: 0.05em;
  color: var(--c-lamp);
}

.page-about .about-next__text {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-haze);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .audience-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .city-clock__row {
    grid-template-columns: 110px minmax(0, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 32px 0 60px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(250px, 0.55fr);
    gap: 56px;
    align-items: end;
    margin-top: 26px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .workflow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
  }

  .page-about .workflow__step::after {
    content: "→";
    left: auto;
    right: -22px;
    bottom: auto;
    top: 50%;
    transform: translateY(-50%);
  }

  .page-about .season-line {
    margin-top: 34px;
  }

  .page-about .season-line__item {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: 34px;
    margin-bottom: 26px;
  }

  .page-about .season-line__marker {
    padding: 8px 0 0 24px;
  }

  .page-about .season-line__marker::before {
    top: 13px;
    bottom: -26px;
  }

  .page-about .season-line__dot {
    top: 10px;
    width: 12px;
    height: 12px;
  }

  .page-about .season-line__year {
    font-size: 17px;
    letter-spacing: 0.1em;
    color: var(--c-lamp);
  }

  .page-about .season-line__item--open .season-line__year {
    color: var(--c-amber);
  }

  .page-about .season-line__headline {
    font-size: 18px;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
    padding: 34px 32px;
  }
}

@media (min-width: 1080px) {
  .page-about .audience-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .audience-grid__item,
  .page-about .workflow__step,
  .page-about .workflow__tools,
  .page-about .season-line__trigger,
  .page-about .crew-cloud__tag,
  .page-about .crew-cloud__since {
    transition: none;
  }

  .page-about .audience-grid__item:hover,
  .page-about .audience-grid__item:focus-within,
  .page-about .workflow__step:hover,
  .page-about .workflow__step:focus-within,
  .page-about .season-line__trigger:hover,
  .page-about .crew-cloud__tag:hover {
    transform: none;
  }
}