.page-about {
  --about-panel: rgba(19, 26, 58, 0.74);
  --about-panel-deep: rgba(11, 16, 38, 0.92);
  --about-hair: rgba(154, 168, 204, 0.16);
  --about-glow-cyan: rgba(43, 232, 213, 0.16);
  --about-glow-violet: rgba(138, 92, 255, 0.2);
  --about-rad: 22px;
}

/* ---------- 通用收紧 ---------- */
.page-about .section {
  padding: clamp(52px, 8vw, 96px) 0;
}

.page-about .section-head {
  max-width: 720px;
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .prose p {
  max-width: 40em;
}

.page-about .divider-slant {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3vw, 32px) 0 clamp(46px, 7vw, 84px);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% 0 -10%;
  z-index: -1;
  background:
    radial-gradient(880px 520px at 76% 8%, var(--about-glow-violet), transparent 66%),
    radial-gradient(680px 460px at 6% 88%, var(--about-glow-cyan), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    repeating-linear-gradient(0deg, rgba(154, 168, 204, 0.06) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(154, 168, 204, 0.06) 0 1px, transparent 1px 64px);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
  pointer-events: none;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
  align-items: center;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 12px 0 18px;
  color: var(--ice);
  text-wrap: balance;
}

.page-about .about-hero__copy .lede {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--mist);
  max-width: 36em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__visual {
  position: relative;
  margin: 0;
  border-radius: var(--about-rad);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: var(--about-panel-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(43, 232, 213, 0.14), transparent 46%, rgba(255, 61, 139, 0.14));
  pointer-events: none;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 1;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ice);
  background: rgba(11, 16, 38, 0.72);
  border: 1px solid var(--line-cyan);
  padding: 5px 10px;
  border-radius: 999px;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  background: var(--about-panel-deep);
}

.page-about .about-hero__stats .stat-value {
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 800;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-hero__stats .stat-label {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-origin__main h2 {
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.2;
  margin: 10px 0 18px;
  color: var(--ice);
  text-wrap: balance;
}

.page-about .about-origin__side {
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-origin__side-title {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--about-hair);
}

.page-about .about-origin__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-origin__list li {
  display: grid;
  gap: 8px;
}

.page-about .about-origin__list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-origin__side-note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-hair);
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-origin__side-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 折叠块 */
.page-about .about-fold {
  margin-top: clamp(20px, 3vw, 28px);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--violet);
  border-radius: 0 14px 14px 0;
  background: linear-gradient(90deg, rgba(138, 92, 255, 0.1), transparent 60%);
}

.page-about .about-fold summary {
  cursor: pointer;
  list-style: none;
  padding: 15px 18px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ice);
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.page-about .about-fold summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--violet);
  width: 18px;
  text-align: center;
}

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

.page-about .about-fold .prose {
  padding: 0 18px 18px;
}

.page-about .about-fold .prose p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  margin: 0 0 12px;
}

.page-about .about-fold .prose strong {
  color: var(--ice);
}

/* ---------- 时间线 ---------- */
.page-about .about-history {
  position: relative;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  position: relative;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 18px 20px 18px 28px;
  border-left: 2px solid var(--line);
  background: linear-gradient(90deg, var(--about-panel), rgba(19, 26, 58, 0.08));
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 5px rgba(43, 232, 213, 0.1);
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  border-left-color: var(--cyan);
  transform: translateX(4px);
  background: linear-gradient(90deg, rgba(43, 232, 213, 0.1), rgba(19, 26, 58, 0.08));
}

.page-about .about-timeline__item:hover::before {
  box-shadow: 0 0 0 7px rgba(43, 232, 213, 0.18);
}

.page-about .about-timeline__year {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin: 0;
}

.page-about .about-timeline__title {
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  color: var(--ice);
  margin: 0 0 6px;
  line-height: 1.3;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--mist);
}

/* ---------- 校对流程 ---------- */
.page-about .about-flow {
  background: linear-gradient(180deg, transparent, rgba(19, 26, 58, 0.36), transparent);
}

.page-about .about-flow__figure {
  margin: 0 0 clamp(28px, 4vw, 42px);
  border: 1px solid var(--about-hair);
  border-radius: 18px;
  overflow: hidden;
  background: var(--about-panel-deep);
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  counter-reset: flowstep;
}

.page-about .about-flow__step {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--about-panel);
  border: 1px solid var(--about-hair);
  border-top: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-flow__step:hover {
  transform: translateY(-4px);
  background: rgba(19, 26, 58, 0.92);
}

.page-about .about-flow__step:nth-child(2n) {
  border-top-color: var(--violet);
}

.page-about .about-flow__step:nth-child(3n) {
  border-top-color: var(--magenta);
}

.page-about .about-flow__num {
  display: block;
  font-size: 26px;
  font-weight: 800;
  line-height: 1;
  color: rgba(43, 232, 213, 0.34);
  margin-bottom: 12px;
}

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

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 46px);
  align-items: start;
}

.page-about .about-team__intro h2 {
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.2;
  margin: 10px 0 18px;
  color: var(--ice);
  text-wrap: balance;
}

.page-about .about-team__figure {
  margin: clamp(22px, 3vw, 30px) 0 0;
  border: 1px solid var(--about-hair);
  border-radius: 18px;
  overflow: hidden;
  background: var(--about-panel-deep);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

.page-about .about-team__roster {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-team__card {
  position: relative;
  padding: 22px 20px;
  background: var(--about-panel);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-team__card--violet {
  border-left-color: var(--violet);
}

.page-about .about-team__card--magenta {
  border-left-color: var(--magenta);
}

.page-about .about-team__card--orange {
  border-left-color: var(--orange);
}

.page-about .about-team__card:hover {
  transform: translateY(-4px);
  background: rgba(19, 26, 58, 0.94);
}

.page-about .about-team__count {
  display: block;
  font-size: clamp(28px, 3.6vw, 36px);
  font-weight: 800;
  line-height: 1;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .about-team__card--violet .about-team__count {
  color: var(--violet);
}

.page-about .about-team__card--magenta .about-team__count {
  color: var(--magenta);
}

.page-about .about-team__card--orange .about-team__count {
  color: var(--orange);
}

.page-about .about-team__role {
  font-size: 17px;
  font-weight: 800;
  color: var(--ice);
  margin: 0 0 8px;
}

.page-about .about-team__card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 三条尺子 ---------- */
.page-about .about-ruler__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-ruler__item {
  position: relative;
  padding: clamp(22px, 3vw, 30px);
  background: linear-gradient(135deg, rgba(43, 232, 213, 0.08), rgba(138, 92, 255, 0.08));
  border: 1px solid var(--about-hair);
  border-radius: 18px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-ruler__item:nth-child(2) {
  background: linear-gradient(135deg, rgba(138, 92, 255, 0.1), rgba(255, 61, 139, 0.08));
}

.page-about .about-ruler__item:nth-child(3) {
  background: linear-gradient(135deg, rgba(255, 162, 58, 0.1), rgba(43, 232, 213, 0.06));
}

.page-about .about-ruler__item:hover {
  border-color: var(--line-cyan);
  transform: translateY(-4px);
}

.page-about .about-ruler__index {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border: 1px solid var(--line-cyan);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 14px;
}

.page-about .about-ruler__item h3 {
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 800;
  color: var(--ice);
  margin: 0 0 10px;
}

.page-about .about-ruler__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 42em;
}

.page-about .about-ruler__tail {
  margin: clamp(24px, 3vw, 34px) 0 0;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-ruler__tail a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 西南视角 ---------- */
.page-about .about-local {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, rgba(138, 92, 255, 0.16), rgba(11, 16, 38, 0.4) 46%, rgba(43, 232, 213, 0.12));
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-local::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(115deg, rgba(234, 242, 255, 0.05) 0 1px, transparent 1px 46px);
  pointer-events: none;
}

.page-about .about-local__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-local__copy h2 {
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.2;
  margin: 10px 0 16px;
  color: var(--ice);
}

.page-about .about-local__copy > p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 40em;
}

.page-about .about-local__points {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-local__points li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--ice);
}

.page-about .about-local__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 2px;
  background: var(--cyan);
}

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

.page-about .about-local__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

.page-about .about-local__tags .tag {
  font-size: 13px;
  padding: 7px 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
    padding: 22px 26px 22px 30px;
  }

  .page-about .about-timeline__year {
    padding-top: 3px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 4vw, 54px);
  }

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

  .page-about .about-local__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-local__tags {
    padding-top: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-flow__step,
  .page-about .about-team__card,
  .page-about .about-ruler__item {
    transition: none;
  }

  .page-about .about-timeline__item:hover,
  .page-about .about-flow__step:hover,
  .page-about .about-team__card:hover,
  .page-about .about-ruler__item:hover {
    transform: none;
  }
}