.page-about {
  --about-gap: clamp(20px, 3vw, 44px);
  --about-line: rgba(244, 231, 211, .16);
  background: var(--ink);
  color: var(--white);
  overflow-x: clip;
}

.page-about .about-crumb {
  padding-top: clamp(18px, 2.6vw, 34px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(26px, 4vw, 56px) 0 clamp(48px, 7vw, 104px);
  background:
    radial-gradient(circle at 86% 10%, rgba(46, 155, 214, .18), transparent 44%),
    radial-gradient(circle at 8% 96%, rgba(11, 59, 58, .9), transparent 58%),
    linear-gradient(180deg, var(--ink) 0%, #08202f 100%);
  border-bottom: var(--frame) solid var(--brown);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 4vw, 54px);
}

.page-about .about-hero__text h1 {
  font-family: var(--font-head);
  font-size: clamp(38px, 6.4vw, 74px);
  font-weight: 800;
  line-height: 1.03;
  letter-spacing: .012em;
  margin: 16px 0 0;
  max-width: 14em;
}

.page-about .about-hero__lead {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.78;
  color: rgba(248, 250, 252, .84);
  max-width: 32em;
  margin: 22px 0 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 36px 0 0;
  padding: 0;
  border: 2px solid var(--about-line);
  background: var(--about-line);
}

.page-about .about-hero__stats .stat {
  background: rgba(6, 24, 38, .88);
  padding: 16px 18px;
  margin: 0;
}

.page-about .about-hero__stats .stat__num {
  display: block;
  order: -1;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.05;
  color: var(--orange);
  margin: 0 0 6px;
}

.page-about .about-hero__stats .stat__label {
  display: block;
  font-size: 13px;
  letter-spacing: .08em;
  color: rgba(248, 250, 252, .68);
  margin: 0;
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
}

.page-about .about-hero__visual {
  border: var(--frame) solid var(--brown);
  box-shadow: var(--shadow-deep);
  background:
    repeating-linear-gradient(135deg, rgba(46, 155, 214, .07) 0 12px, transparent 12px 24px),
    linear-gradient(158deg, var(--teal) 0%, var(--ink) 72%);
  padding: clamp(12px, 2vw, 22px);
}

.page-about .about-hero__visual svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 章节色带 ---------- */

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

.page-about .about-chapter .band {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 22px;
  border-top: var(--frame) solid var(--orange);
  padding-top: 18px;
  margin: 0 0 clamp(30px, 4.6vw, 58px);
}

.page-about .band__num {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .16em;
  color: var(--orange);
  border: 2px solid var(--orange);
  padding: 3px 10px;
  flex: 0 0 auto;
}

.page-about .band__title {
  flex: 1 1 300px;
  font-family: var(--font-head);
  font-size: clamp(26px, 3.6vw, 44px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: .01em;
  margin: 0;
  color: var(--white);
}

.page-about .band__meta {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .14em;
  color: rgba(248, 250, 252, .5);
  margin: 0;
}

/* ---------- 图文错位 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-text p {
  font-size: 17px;
  line-height: 1.8;
  color: rgba(248, 250, 252, .84);
  margin: 0 0 1.15em;
}

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

.page-about .about-note {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--data);
  border-left: 3px solid var(--data);
  padding-left: 14px;
  margin-top: 1.6em !important;
}

.page-about .about-aside {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-factlist {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 2px solid var(--about-line);
  background: rgba(11, 59, 58, .45);
}

.page-about .about-factlist li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 18px;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(248, 250, 252, .8);
  border-bottom: 2px solid var(--about-line);
}

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

.page-about .about-factlist .mono {
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--sand);
  flex: 0 0 auto;
}

/* ---------- 技能树 ---------- */

.page-about .method-tree {
  list-style: none;
  margin: 1.6em 0 0;
  padding: 0;
  position: relative;
}

.page-about .method-tree::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 14px;
  bottom: 24px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--lake) 60%, transparent);
}

.page-about .method-tree__node {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 0 0 22px;
}

.page-about .method-tree__node:last-child {
  padding-bottom: 0;
}

.page-about .method-tree__idx {
  position: relative;
  z-index: 1;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--ink);
  background: var(--data);
  border: 3px solid var(--ink);
  border-radius: 50%;
}

.page-about .method-tree__body h3 {
  font-family: var(--font-head);
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--white);
  margin: 8px 0 6px;
}

.page-about .method-tree__body p {
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(248, 250, 252, .74);
  margin: 0;
  border: 2px solid var(--about-line);
  background: rgba(6, 24, 38, .55);
  padding: 12px 16px;
}

/* ---------- 图片容器微调 ---------- */

.page-about .about-method-media,
.page-about .about-history-media {
  align-self: start;
}

.page-about .about-version-media {
  align-self: start;
  margin: 0;
}

.page-about .media-frame__cap {
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(248, 250, 252, .62);
}

/* ---------- 标签页 ---------- */

.page-about .about-tabs {
  margin-top: clamp(34px, 4.5vw, 58px);
}

.page-about .about-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--about-line);
}

.page-about .about-tabs .tabs__tab {
  font-family: var(--font-head);
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 700;
  letter-spacing: .04em;
  padding: 10px 20px;
  background: transparent;
  color: rgba(248, 250, 252, .74);
  border: 2px solid rgba(244, 231, 211, .26);
  cursor: pointer;
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .about-tabs .tabs__tab:hover {
  transform: translate(2px, -2px);
  border-color: var(--orange);
  color: var(--white);
}

.page-about .about-tabs .tabs__tab[aria-selected="true"] {
  background: var(--cream);
  color: var(--brown);
  border-color: var(--cream);
  box-shadow: var(--shadow-deep);
}

.page-about .about-tabs .tabs__tab:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-tabs .tabs__panel {
  padding-top: 24px;
}

.page-about .about-tabs .tabs__panel p {
  max-width: 62em;
  font-size: 16.5px;
  line-height: 1.82;
  color: rgba(248, 250, 252, .82);
  margin: 0;
  border-left: 5px solid var(--lake);
  padding-left: clamp(16px, 2.4vw, 26px);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-team__headline {
  border: var(--frame) solid var(--brown);
  box-shadow: var(--shadow-hard);
  background: linear-gradient(140deg, var(--teal) 0%, #07222f 100%);
  padding: clamp(22px, 3vw, 34px);
}

.page-about .about-team__big {
  font-family: var(--font-mono);
  font-size: clamp(56px, 9vw, 96px);
  line-height: .92;
  font-weight: 700;
  color: var(--orange);
  margin: 0;
}

.page-about .about-team__caption {
  font-size: 16px;
  line-height: 1.78;
  color: rgba(248, 250, 252, .82);
  margin: 18px 0 0;
  max-width: 30em;
}

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

.page-about .about-role {
  border: 2px solid var(--about-line);
  background: rgba(6, 24, 38, .58);
  transition: border-color .22s ease;
}

.page-about .about-role[open] {
  border-color: rgba(255, 106, 42, .55);
}

.page-about .about-role > summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px clamp(16px, 2.4vw, 24px);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--white);
}

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

.page-about .about-role > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--orange);
  flex: 0 0 auto;
}

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

.page-about .about-role > summary:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: -3px;
}

.page-about .about-role__name {
  flex: 1 1 auto;
}

.page-about .about-role__count {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--data);
}

.page-about .about-role__body {
  padding: 0 clamp(16px, 2.4vw, 24px) 20px;
}

.page-about .about-role__body p {
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(248, 250, 252, .76);
  margin: 0;
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.4vw, 40px) clamp(24px, 3.6vw, 42px);
  border-left: 2px solid rgba(201, 164, 92, .4);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--sand);
  border: 2px solid var(--ink);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .14em;
  color: var(--sand);
  border: 2px solid rgba(201, 164, 92, .5);
  padding: 2px 10px;
  margin-bottom: 12px;
}

.page-about .about-timeline__card {
  border: 2px solid var(--about-line);
  background: rgba(11, 59, 58, .42);
  padding: clamp(16px, 2.4vw, 24px);
  transition: transform .26s ease, border-color .26s ease;
}

.page-about .about-timeline__item:hover .about-timeline__card {
  transform: translate(4px, -4px);
  border-color: var(--orange);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-head);
  font-size: clamp(19px, 2.3vw, 24px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .about-timeline__card p {
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(248, 250, 252, .76);
  margin: 0 0 14px;
}

.page-about .about-timeline__card .chip {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
}

/* ---------- 合作与荣誉 ---------- */

.page-about .about-ecosystem {
  display: grid;
  gap: clamp(30px, 4.4vw, 54px);
}

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

.page-about .about-partners li {
  background: rgba(6, 24, 38, .92);
  padding: clamp(18px, 2.6vw, 26px);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 4px 18px;
  align-items: baseline;
}

.page-about .about-partners__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.6vw, 52px);
  line-height: .95;
  color: var(--orange);
}

.page-about .about-partners__label {
  font-family: var(--font-head);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--white);
}

.page-about .about-partners__text {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(248, 250, 252, .72);
}

.page-about .about-honors__title {
  font-family: var(--font-head);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--sand);
  margin: 0 0 18px;
}

.page-about .about-honors__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-honor {
  border-color: rgba(201, 164, 92, .45);
}

.page-about .about-honor .card__title {
  font-size: clamp(17px, 2vw, 20px);
}

.page-about .about-cta {
  margin-top: clamp(36px, 5vw, 64px);
  border: var(--frame) solid var(--brown);
  box-shadow: var(--shadow-hard);
  background: linear-gradient(128deg, var(--orange) 0%, #d8501a 100%);
  color: var(--brown);
  padding: clamp(24px, 3.4vw, 40px);
  display: grid;
  gap: 22px;
}

.page-about .about-cta__text {
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.75;
  font-weight: 500;
  margin: 0;
  max-width: 46em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-cta__actions .btn {
  border-color: var(--brown);
  box-shadow: 5px 5px 0 var(--brown);
}

.page-about .about-cta__actions .btn--data {
  color: var(--brown);
}

.page-about .about-cta__actions .btn--ghost {
  background: transparent;
  color: var(--brown);
}

.page-about .about-cta__actions .btn--ghost:hover {
  background: var(--brown);
  color: var(--cream);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-team {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: center;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.14fr) minmax(0, .86fr);
    align-items: start;
  }

  .page-about .about-split--flip > *:first-child {
    order: 2;
  }

  .page-about .about-split--flip > *:last-child {
    order: 1;
  }
}

@media (max-width: 939px) {
  .page-about .about-split--flip .about-method-media {
    order: -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__card,
  .page-about .about-tabs .tabs__tab,
  .page-about .about-role {
    transition: none;
  }

  .page-about .about-timeline__item:hover .about-timeline__card,
  .page-about .about-tabs .tabs__tab:hover {
    transform: none;
  }
}