.page-about {
  --about-rail-w: 108px;
  --about-gap: clamp(22px, 4vw, 44px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(130% 95% at 82% -10%, rgba(27, 77, 255, .42), transparent 62%),
    var(--night);
  color: var(--cream);
  padding: clamp(30px, 6vw, 64px) 0 clamp(48px, 9vw, 96px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 34%;
  bottom: -42%;
  width: 100%;
  height: 76%;
  background: linear-gradient(135deg, var(--eb) 0%, var(--eb-deep) 100%);
  transform: rotate(-8deg);
  opacity: .55;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(32px, 7.2vw, 62px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -.01em;
  max-width: 15em;
}

.page-about .about-lede {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(244, 239, 227, .84);
}

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

.page-about .about-hero .btn--ghost {
  border-color: rgba(244, 239, 227, .42);
  color: var(--cream);
}

.page-about .about-hero__board {
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  padding: 22px 22px 18px;
  backdrop-filter: blur(8px);
}

.page-about .about-board__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--mist);
}

.page-about .about-board__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
  margin: 0;
}

.page-about .about-board__item dt {
  font-size: 12px;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .about-board__item dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-board__item .data {
  font-family: var(--font-mono);
  font-size: 24px;
  color: var(--neon);
  letter-spacing: .02em;
}

.page-about .about-board__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--glass-line);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(244, 239, 227, .7);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: clamp(46px, 8vw, 92px) 0;
}

.page-about .about-section--cream {
  background: var(--cream);
  color: var(--ink);
}

.page-about .about-section--night {
  background: var(--night);
  color: var(--cream);
}

.page-about .about-head {
  position: relative;
  padding-left: 0;
  margin-bottom: clamp(26px, 4vw, 44px);
  max-width: 42em;
}

.page-about .about-head h2 {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about .about-head__sub {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-head--night .about-head__sub {
  color: rgba(244, 239, 227, .72);
}

.page-about .about-note-v {
  position: absolute;
  right: 0;
  top: 2px;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--lake);
  opacity: .9;
}

.page-about .about-head--night .about-note-v {
  color: var(--neon);
}

/* ---------- 我们在做什么 ---------- */
.page-about .about-intro {
  max-width: 34em;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-intro p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-intro__lead {
  font-size: 17px !important;
  color: var(--ink) !important;
}

.page-about .about-pillars {
  gap: 18px;
}

.page-about .about-pillar {
  position: relative;
  padding: 24px 22px 22px;
  border-top: 4px solid var(--eb);
  background: #fff;
}

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

.page-about .about-pillar:nth-child(3) {
  border-top-color: var(--neon);
}

.page-about .about-pillar__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--mist);
  margin-bottom: 10px;
}

.page-about .about-pillar .card__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
}

.page-about .about-pillar p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 三个小组 ---------- */
.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-split__media .media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-split__body {
  display: grid;
  gap: 16px;
}

.page-about .about-desk {
  position: relative;
  padding: 22px 22px 22px 26px;
  background: var(--cream);
  border-left: 4px solid var(--eb);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow-1);
}

.page-about .about-desk:nth-child(2) {
  border-left-color: var(--lake);
}

.page-about .about-desk:nth-child(3) {
  border-left-color: var(--red);
}

.page-about .about-desk h3 {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
}

.page-about .about-desk p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 校订流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 48px);
  padding: 0;
  display: grid;
  gap: 16px;
  counter-reset: step;
}

.page-about .about-step {
  position: relative;
  padding: 22px 20px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--neon), var(--lake));
  border-radius: var(--radius) 0 0 var(--radius);
}

.page-about .about-step__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--neon);
}

.page-about .about-step h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--cream);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 239, 227, .74);
}

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

.page-about .about-flow__detail {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-fold {
  background: var(--cream);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-fold summary {
  cursor: pointer;
  padding: 16px 18px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
  list-style: none;
}

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

.page-about .about-fold summary::before {
  content: "+";
  display: inline-block;
  width: 1.2em;
  font-family: var(--font-mono);
  color: var(--eb);
}

.page-about .about-fold[open] summary::before {
  content: "–";
}

.page-about .about-fold p {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-flow__media .media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 24px;
}

.page-about .about-rail ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.page-about .about-rail a {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .12em;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}

.page-about .about-rail a:hover,
.page-about .about-rail a:focus-visible {
  color: var(--eb);
  border-bottom-color: var(--neon);
}

.page-about .about-phases {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
  border-left: 2px solid var(--line);
  padding-left: 22px;
}

.page-about .about-phase {
  position: relative;
  padding: 22px 22px 20px;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

.page-about .about-phase::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 30px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--eb);
  border: 3px solid var(--cream);
  box-shadow: 0 0 0 2px var(--eb);
}

.page-about .about-phase:nth-child(3)::before {
  background: var(--neon);
  box-shadow: 0 0 0 2px var(--neon);
}

.page-about .about-phase:nth-child(4)::before {
  background: var(--lake);
  box-shadow: 0 0 0 2px var(--lake);
}

.page-about .about-phase__head {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .about-phase__head h3 {
  flex: 1 1 100%;
  margin: 6px 0 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.35;
  order: 3;
}

.page-about .about-phase__year {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--line-strong);
  letter-spacing: .04em;
}

.page-about .about-phase p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 覆盖与协作 ---------- */
.page-about .about-cover {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-cover__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-figure {
  padding: 18px 16px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.page-about .about-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--eb);
}

.page-about .about-figure:nth-child(2) .about-figure__num {
  color: var(--lake);
}

.page-about .about-figure:nth-child(3) .about-figure__num {
  color: var(--eb-deep);
}

.page-about .about-figure:nth-child(4) .about-figure__num {
  color: var(--lake);
}

.page-about .about-figure__label {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .about-cover__text p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 34em;
}

.page-about .about-cover__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* ---------- 荣誉 ---------- */
.page-about .about-recog {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-recog__badge {
  padding: 26px 22px;
  background: linear-gradient(150deg, var(--eb) 0%, var(--eb-deep) 100%);
  color: var(--cream);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
}

.page-about .about-recog__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(42px, 8vw, 64px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-recog__label {
  display: block;
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.65;
  color: rgba(244, 239, 227, .9);
}

.page-about .about-recog__body h2 {
  margin: 0 0 16px;
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 900;
  line-height: 1.25;
}

.page-about .about-recog__body p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 34em;
}

.page-about .about-recog__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background:
    radial-gradient(110% 90% at 15% 0%, rgba(31, 166, 160, .3), transparent 58%),
    var(--night);
  color: var(--cream);
  padding: clamp(40px, 7vw, 72px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 900;
  line-height: 1.25;
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 239, 227, .78);
  max-width: 32em;
}

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

.page-about .about-cta .btn--ghost {
  border-color: rgba(244, 239, 227, .42);
  color: var(--cream);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cover__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.35fr .95fr;
    align-items: center;
    gap: clamp(30px, 5vw, 64px);
  }

  .page-about .about-head {
    padding-right: 64px;
  }

  .page-about .about-split {
    grid-template-columns: 1.04fr .96fr;
    align-items: center;
  }

  .page-about .about-split__media {
    margin-left: -4%;
  }

  .page-about .about-split__body {
    margin-top: -42px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-flow {
    grid-template-columns: 1.12fr .88fr;
    align-items: start;
  }

  .page-about .about-timeline {
    grid-template-columns: var(--about-rail-w) 1fr;
    gap: 40px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-about .about-rail ol {
    flex-direction: column;
    gap: 10px;
  }

  .page-about .about-rail a {
    font-size: 20px;
    font-weight: 700;
    color: var(--line-strong);
  }

  .page-about .about-phases {
    padding-left: 28px;
  }

  .page-about .about-phase:nth-child(even) {
    margin-left: 34px;
  }

  .page-about .about-cover {
    grid-template-columns: .95fr 1.05fr;
    align-items: start;
  }

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

  .page-about .about-cover__media {
    margin-top: -24px;
  }

  .page-about .about-recog {
    grid-template-columns: .78fr 1.22fr;
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: 1fr auto;
    gap: 40px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-split__body {
    margin-left: -64px;
    position: relative;
    z-index: 2;
  }
}
</