.page-about {
  --about-rail-w: 300px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(780px 420px at 6% -14%, rgba(139, 92, 246, 0.38), transparent 68%),
    radial-gradient(620px 360px at 98% 4%, rgba(34, 211, 238, 0.2), transparent 70%),
    var(--deep);
  border-bottom: 1px solid var(--stone);
}

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

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: 4%;
  width: 48vw;
  height: 82%;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.22), rgba(34, 211, 238, 0.05));
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 76%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 17em;
  font-size: clamp(29px, 4.4vw, 52px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.022em;
  color: var(--white);
}

.page-about .about-hero__intro {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .about-hero__facts {
  display: grid;
  gap: 12px;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 18px;
  border: 2px solid var(--stone);
  border-left: 4px solid var(--violet);
  background: rgba(21, 28, 74, 0.72);
  box-shadow: 5px 5px 0 rgba(11, 16, 48, 0.55);
}

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

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

.page-about .about-fact:nth-child(4) {
  border-left-color: var(--moss);
}

.page-about .about-fact__num {
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-fact__unit {
  margin-left: 4px;
  font-size: 0.5em;
  color: var(--cyan);
}

.page-about .about-fact__label {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-faint);
}

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  margin: clamp(32px, 5vw, 58px) 0 0;
  border: 2px solid var(--stone);
  box-shadow: var(--shadow-hard);
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: clamp(48px, 8vw, 100px) 0;
  background: var(--deep);
  border-bottom: 1px solid var(--stone);
}

.page-about .about-track {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-rail h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.012em;
  color: var(--white);
}

.page-about .about-rail__intro {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .about-rail__list {
  display: grid;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-rail__tab {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
  padding: 13px 16px;
  border: 2px solid var(--stone);
  background: rgba(21, 28, 74, 0.5);
  color: var(--ink-dim);
  font-family: inherit;
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease),
    color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-rail__tab:hover {
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-rail__tab[aria-selected="true"] {
  border-color: var(--violet);
  background: linear-gradient(120deg, rgba(139, 92, 246, 0.3), rgba(34, 211, 238, 0.08));
  color: var(--white);
  box-shadow: var(--shadow-hard);
  transform: translate(2px, -2px);
}

.page-about .about-rail__years {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-rail__name {
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-track__body {
  min-width: 0;
}

.page-about .about-timeline__figure {
  max-width: 400px;
  margin: 0 auto clamp(26px, 4vw, 42px);
  border: 2px solid var(--stone);
  background: var(--midnight);
}

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

.page-about .about-stage {
  padding-top: clamp(18px, 3vw, 28px);
  border-top: 2px solid var(--violet);
}

.page-about .about-stage__title {
  margin: 0 0 18px;
  font-size: clamp(19px, 2.1vw, 23px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-nodes {
  position: relative;
  display: grid;
  gap: 18px;
}

.page-about .about-nodes::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--violet), var(--cyan));
  opacity: 0.45;
}

.page-about .about-node {
  position: relative;
  padding: 16px 20px 16px 42px;
  border: 2px solid var(--stone);
  background: rgba(21, 28, 74, 0.55);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-node:hover {
  border-color: var(--violet);
  background: rgba(21, 28, 74, 0.85);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border: 3px solid var(--cyan);
  border-radius: 50%;
  background: var(--deep);
}

.page-about .about-node__year {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.42;
  color: var(--white);
}

.page-about .about-node p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(48px, 8vw, 100px) 0;
  background: var(--midnight);
  border-bottom: 1px solid var(--stone);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(28px, 4vw, 50px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-team__media {
  margin: 0;
  border: 2px solid var(--stone);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-team__body h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.012em;
  color: var(--white);
}

.page-about .about-team__lead {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .about-roles {
  display: grid;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-role {
  border: 2px solid var(--stone);
  background: rgba(11, 16, 48, 0.5);
}

.page-about .about-role[open] {
  border-color: var(--violet);
  background: rgba(11, 16, 48, 0.82);
}

.page-about .about-role summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  list-style: none;
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--white);
}

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

.page-about .about-role summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

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

.page-about .about-role__idx {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-role p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---------- 合作与覆盖 ---------- */
.page-about .about-eco {
  padding: clamp(48px, 8vw, 100px) 0;
  background: var(--deep);
  border-bottom: 1px solid var(--stone);
}

.page-about .about-eco__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-eco__copy h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.012em;
  color: var(--white);
}

.page-about .about-eco__copy > p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

.page-about .about-partners {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-partners li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .about-partners li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 10px;
  height: 2px;
  background: var(--violet);
}

.page-about .about-eco__stats {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-stat {
  padding: 16px;
  border: 2px solid var(--stone);
  border-top: 4px solid var(--cyan);
  background: rgba(21, 28, 74, 0.6);
}

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

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

.page-about .about-stat:nth-child(4) {
  border-top-color: var(--moss);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 29px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 7px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-faint);
}

/* ---------- 行业交流与荣誉 ---------- */
.page-about .about-honors {
  padding: clamp(44px, 7vw, 88px) 0;
  background: var(--midnight);
  border-bottom: 1px solid var(--stone);
}

.page-about .about-honors__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-honors__lead h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 2.8vw, 32px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.012em;
  color: var(--white);
}

.page-about .about-honors__lead p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

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

.page-about .about-honors__list li {
  padding: 16px 18px;
  border: 2px solid var(--stone);
  border-left: 4px solid var(--cyan);
  background: rgba(11, 16, 48, 0.55);
}

.page-about .about-honors__list li:nth-child(2) {
  border-left-color: var(--violet);
}

.page-about .about-honors__list li:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .about-honors__title {
  margin: 0;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--white);
}

.page-about .about-honors__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 长期承诺 ---------- */
.page-about .about-values {
  padding: clamp(48px, 8vw, 104px) 0;
  background:
    radial-gradient(680px 340px at 88% 6%, rgba(139, 92, 246, 0.24), transparent 70%),
    var(--deep);
}

.page-about .about-values__inner {
  max-width: 820px;
}

.page-about .about-values__inner h2 {
  margin: 12px 0 0;
  font-size: clamp(25px, 3.2vw, 38px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.016em;
  color: var(--white);
}

.page-about .about-values__lead {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.3vw, 16.5px);
  line-height: 1.9;
  color: var(--ink-dim);
}

.page-about .about-values__cards {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-values__card {
  padding: 20px 22px;
  border: 2px solid var(--stone);
  border-left: 5px solid var(--violet);
  background: rgba(21, 28, 74, 0.6);
}

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

.page-about .about-values__card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-values__card p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .about-values__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-eco__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 680px) {
  .page-about .about-values__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-eco__grid,
  .page-about .about-honors__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-team__media {
    margin-top: clamp(12px, 3vw, 36px);
  }
}

@media (min-width: 980px) {
  .page-about .about-track {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    padding-right: 8px;
  }

  .page-about .about-timeline__figure {
    max-width: 360px;
  }
}

@media (max-width: 979px) {
  .page-about .about-rail__list {
    display: flex;
    gap: 10px;
    padding: 4px 4px 12px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }

  .page-about .about-rail__tab {
    flex: 0 0 auto;
    min-width: 168px;
  }

  .page-about .about-rail__tab[aria-selected="true"] {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__tab,
  .page-about .about-node {
    transition: none;
  }
}