.page-about {
  --about-rule: rgba(159, 179, 200, 0.24);
  --about-panel: rgba(244, 241, 232, 0.05);
  --about-tl-pad: clamp(22px, 4vw, 46px);
  background: var(--night);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 84px) 0 clamp(38px, 6vw, 78px);
  background: linear-gradient(158deg, var(--night) 0%, var(--night) 50%, var(--green) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -8%;
  width: 58%;
  height: 172%;
  background: linear-gradient(168deg, rgba(42, 35, 80, 0.9), rgba(42, 35, 80, 0) 68%);
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -4%;
  bottom: 0;
  width: 46%;
  height: 5px;
  background: var(--lime);
  transform: skewX(-26deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__facts {
  border: 1px solid var(--about-rule);
  border-top: 2px solid var(--lime);
  background: rgba(8, 22, 31, 0.5);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-hero__facts-title {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .fact-list {
  margin: 0;
}

.page-about .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--about-rule);
}

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

.page-about .fact dt {
  font-size: 13px;
  color: var(--mist);
}

.page-about .fact dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--paper);
  text-align: right;
}

.page-about .fact dd b {
  color: var(--lime);
  font-weight: 700;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.8fr);
  }
}

/* ---------- 服务对象 ---------- */

.page-about .about-audience {
  background: var(--night);
}

.page-about .audience-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .audience-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  padding-top: 18px;
  border-top: 1px solid var(--about-rule);
}

.page-about .audience-item .index-num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-size: 14px;
}

.page-about .audience-item h3 {
  grid-column: 2;
  margin: 0;
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.5;
}

.page-about .audience-item p {
  grid-column: 2;
  margin: 6px 0 0;
  color: var(--mist);
  line-height: 1.75;
  max-width: 44ch;
}

@media (min-width: 780px) {
  .page-about .audience-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(24px, 3vw, 36px) clamp(28px, 5vw, 64px);
  }
}

/* ---------- 校验路径 ---------- */

.page-about .about-method {
  position: relative;
  overflow: hidden;
  background: var(--green);
}

.page-about .about-method::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(200, 247, 81, 0.07) 0 1px,
    transparent 1px 44px
  );
  pointer-events: none;
}

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

.page-about .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .step {
  position: relative;
  padding: 20px 0 0 clamp(14px, 2vw, 22px);
  border-top: 1px solid rgba(244, 241, 232, 0.22);
}

.page-about .step::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 2px;
  height: 26px;
  background: var(--lime);
}

.page-about .step__num {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .step__title {
  margin: 8px 0 8px;
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.5;
}

.page-about .step__text {
  margin: 0;
  color: rgba(244, 241, 232, 0.78);
  line-height: 1.75;
  max-width: 42ch;
}

@media (min-width: 820px) {
  .page-about .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 56px);
  }

  .page-about .step-list > .step:last-child {
    grid-column: 1 / -1;
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--night);
}

.page-about .team-visual {
  margin: 0 0 clamp(26px, 4vw, 42px);
  position: relative;
  border: 1px solid var(--about-rule);
  overflow: hidden;
}

.page-about .team-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .team-visual .media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  margin: 0;
  padding: 8px 14px;
  background: rgba(11, 27, 43, 0.86);
  border-top: 1px solid var(--about-rule);
  border-right: 1px solid var(--about-rule);
  font-size: 12px;
  color: var(--mist);
}

.page-about .team-cards {
  align-items: stretch;
}

.page-about .team-cards .doc-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .team-cards .doc-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(8, 22, 31, 0.5);
}

.page-about .team-cards .doc-card__text {
  margin: 0;
  line-height: 1.75;
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  background: var(--indigo);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  pointer-events: none;
}

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

.page-about .timeline-ruler {
  display: block;
  width: 100%;
  height: 26px;
  margin: 0 0 clamp(20px, 3vw, 34px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--about-tl-pad);
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--lime) 72%, var(--alert));
  opacity: 0.65;
}

.page-about .timeline > li {
  position: relative;
  margin-bottom: 12px;
}

.page-about .timeline > li:last-child {
  margin-bottom: 0;
}

.page-about .timeline > li::before {
  content: "";
  position: absolute;
  left: calc(8px - var(--about-tl-pad) - 4px);
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(71, 217, 196, 0.14);
}

.page-about .timeline > li:last-child::before {
  background: var(--lime);
  box-shadow: 0 0 0 5px rgba(200, 247, 81, 0.18);
}

.page-about .timeline__node {
  border: 1px solid var(--about-rule);
  background: rgba(11, 27, 43, 0.42);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .timeline__node:hover {
  border-color: rgba(200, 247, 81, 0.55);
  background: rgba(11, 27, 43, 0.68);
}

.page-about .timeline__node[open] {
  border-color: rgba(200, 247, 81, 0.42);
}

.page-about .timeline__node > summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 16px;
  padding: 13px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .timeline__node > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 15px;
  color: var(--lime);
}

.page-about .timeline__node[open] > summary::after {
  content: "–";
}

.page-about .timeline__node > summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .timeline__season {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .timeline__node.is-current .timeline__season {
  color: var(--lime);
}

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

.page-about .timeline__body {
  padding: 0 18px 16px;
  border-top: 1px dashed var(--about-rule);
  margin-top: 2px;
  padding-top: 12px;
}

.page-about .timeline__body p {
  margin: 0;
  color: rgba(244, 241, 232, 0.8);
  line-height: 1.78;
  max-width: 46ch;
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco {
  background: linear-gradient(180deg, var(--night) 0%, #0A2A22 100%);
}

.page-about .about-eco__grid {
  display: grid;
  gap: clamp(34px, 5vw, 64px);
  align-items: center;
}

.page-about .eco-ring {
  position: relative;
  width: 300px;
  height: 300px;
  margin: 0 auto;
}

.page-about .eco-ring::before {
  content: "";
  position: absolute;
  inset: 32px;
  border-radius: 50%;
  border: 1px dashed rgba(159, 179, 200, 0.3);
}

.page-about .eco-ring__core {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 132px;
  text-align: center;
}

.page-about .eco-ring__core b {
  display: block;
  font-family: var(--mono);
  font-size: 40px;
  line-height: 1;
  color: var(--lime);
}

.page-about .eco-ring__core i {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .eco-node {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  transform: rotate(calc(var(--i) * 30deg)) translateY(-118px) rotate(calc(var(--i) * -30deg));
}

.page-about .eco-dot {
  position: absolute;
  left: -6px;
  top: -6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  border: 1px solid rgba(11, 27, 43, 0.6);
  transition: background 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .eco-node:hover .eco-dot {
  background: var(--lime);
  transform: scale(1.4);
}

.page-about .eco-tip {
  position: absolute;
  left: 50%;
  top: -32px;
  transform: translate(-50%, 5px);
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--night);
  background: var(--lime);
  padding: 4px 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .eco-node:hover .eco-tip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.page-about .about-eco__body .prose {
  margin: 12px 0 0;
  color: rgba(244, 241, 232, 0.82);
  line-height: 1.78;
}

.page-about .eco-points {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .eco-points li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--about-rule);
  font-size: 14px;
  color: var(--mist);
  line-height: 1.7;
}

.page-about .eco-points li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .eco-points b {
  flex: none;
  min-width: 3.2em;
  font-family: var(--mono);
  font-size: 18px;
  color: var(--lime);
}

.page-about .about-eco__body .link {
  display: inline-block;
  margin-top: clamp(18px, 2.4vw, 24px);
}

@media (min-width: 900px) {
  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .page-about .eco-ring {
    width: 380px;
    height: 380px;
    margin: 0;
  }

  .page-about .eco-ring::before {
    inset: 38px;
  }

  .page-about .eco-node {
    transform: rotate(calc(var(--i) * 30deg)) translateY(-152px) rotate(calc(var(--i) * -30deg));
  }
}

/* ---------- 长期合作理由 ---------- */

.page-about .about-reasons {
  background: var(--night);
}

.page-about .reason-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .reason {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  padding-top: 18px;
  border-top: 1px solid var(--about-rule);
}

.page-about .reason__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .reason__title {
  grid-column: 2;
  margin: 0;
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.5;
}

.page-about .reason__text {
  grid-column: 2;
  margin: 6px 0 0;
  color: var(--mist);
  line-height: 1.78;
  max-width: 44ch;
}

@media (min-width: 780px) {
  .page-about .reason-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(24px, 3vw, 36px) clamp(28px, 5vw, 64px);
  }
}

/* ---------- 收束区块 ---------- */

.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, var(--wine) 0%, var(--night) 78%);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  right: -10%;
  top: -60%;
  width: 46%;
  height: 200%;
  background: linear-gradient(180deg, rgba(200, 247, 81, 0.1), rgba(200, 247, 81, 0));
  transform: rotate(16deg);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.page-about .about-cta__inner .prose {
  margin: 14px 0 0;
  color: rgba(244, 241, 232, 0.82);
  line-height: 1.78;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

/* ---------- 窄屏保护 ---------- */

@media (max-width: 560px) {
  .page-about .eco-ring {
    width: 250px;
    height: 250px;
  }

  .page-about .eco-ring::before {
    inset: 27px;
  }

  .page-about .eco-node {
    transform: rotate(calc(var(--i) * 30deg)) translateY(-96px) rotate(calc(var(--i) * -30deg));
  }

  .page-about .eco-tip {
    display: none;
  }

  .page-about .timeline__node > summary {
    padding: 12px 14px;
  }

  .page-about .timeline__body {
    padding: 12px 14px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-cards .doc-card,
  .page-about .eco-dot,
  .page-about .eco-tip,
  .page-about .timeline__node {
    transition: none;
  }

  .page-about .team-cards .doc-card:hover {
    transform: none;
  }
}

.page-about {
  --i: inherit;
}