.page-about {
  --about-tint: #EEF3EE;
  --about-notch: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  background: var(--paper);
  color: var(--text);
  overflow-x: hidden;
}

.page-about p {
  margin: 0 0 1.05em;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.4vw, 2.45rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0.25em 0 0.62em;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.18rem;
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 0.55em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 4vw, 36px) 0 clamp(44px, 7vw, 88px);
  background:
    radial-gradient(92% 72% at 88% -6%, rgba(63, 163, 107, 0.18), transparent 62%),
    radial-gradient(58% 52% at 0% 100%, rgba(242, 106, 33, 0.1), transparent 70%),
    var(--paper);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(18px, 3vw, 34px);
  align-items: end;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 7.6vw, 4.9rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  color: var(--ink);
  margin: 0.24em 0 0.46em;
}

.page-about .about-hero__lead .lead {
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.8;
  color: var(--text);
  max-width: 56ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero__card {
  background-color: var(--ink);
  background-image: radial-gradient(rgba(232, 255, 82, 0.16) 1px, transparent 1px);
  background-size: 10px 10px;
  color: var(--paper);
  padding: clamp(20px, 3vw, 30px);
  clip-path: var(--about-notch);
}

.page-about .about-hero__label {
  margin: 0 0 4px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-stats {
  list-style: none;
  margin: 14px 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--neon);
}

.page-about .about-stats__plus {
  font-size: 0.62em;
  margin-left: 1px;
}

.page-about .about-stats__unit {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(247, 245, 239, 0.72);
}

.page-about .about-hero__note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(247, 245, 239, 0.18);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(247, 245, 239, 0.7);
  max-width: none;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-about .about-hero__lead {
    padding-bottom: 8px;
  }
}

/* ---------- 跑道分隔条 ---------- */
.page-about .about-divider {
  height: 8px;
  background: repeating-linear-gradient(115deg, var(--track) 0 8px, var(--ink) 8px 16px);
  transition: transform 0.3s var(--ease);
  transform-origin: center;
}

.page-about .about-divider:hover {
  transform: scaleY(1.75);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: clamp(46px, 8vw, 96px) 0;
}

.page-about .about-sec--tint {
  background: var(--about-tint);
}

.page-about .about-sechead {
  max-width: 760px;
  margin-bottom: clamp(24px, 4vw, 46px);
}

.page-about .about-sechead .lead {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 60ch;
}

/* ---------- 起点 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-split__media {
  margin: 0;
}

.page-about .about-split__media img,
.page-about .about-team__media img,
.page-about .about-wide-img img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--about-notch);
  background: var(--sage-bg);
}

.page-about figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--track);
  font-size: 13px;
  line-height: 1.7;
  color: var(--sage);
  max-width: 52ch;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
  .page-about .about-split__media {
    margin-top: 30px;
  }
  .page-about .about-split__body {
    padding-left: clamp(0px, 2vw, 22px);
  }
}

/* ---------- 三件事 ---------- */
.page-about .about-duties {
  display: grid;
  gap: 14px;
}

.page-about .about-duty {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--grass);
  padding: clamp(18px, 2.6vw, 28px);
  clip-path: var(--about-notch);
}

.page-about .about-duty__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--grass);
  max-width: none;
}

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

.page-about .about-duties__more {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: none;
}

.page-about .about-link {
  color: var(--grass);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(31, 122, 76, 0.32);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-link:hover {
  color: var(--track);
  border-color: var(--track);
}

@media (min-width: 820px) {
  .page-about .about-duties {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .about-duty:nth-child(1) {
    grid-column: 1 / 6;
  }
  .page-about .about-duty:nth-child(2) {
    grid-column: 7 / 13;
    margin-top: 48px;
  }
  .page-about .about-duty:nth-child(3) {
    grid-column: 3 / 10;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 18px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: inline-block;
  padding: 5px 10px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--sage);
  text-decoration: none;
  border: 1px solid var(--line);
  background: var(--paper);
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__link:hover {
  color: var(--grass);
  border-color: var(--grass-lt);
}

.page-about .about-rail__link[aria-current] {
  color: var(--track);
  border-color: var(--track);
  background: rgba(242, 106, 33, 0.08);
}

.page-about .about-nodes {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 42px);
  padding-left: 26px;
}

.page-about .about-nodes::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--track), rgba(242, 106, 33, 0.14));
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 5px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--track);
  background: var(--neon);
  transform: rotate(45deg);
  box-sizing: content-box;
}

.page-about .about-node__index {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--track);
  max-width: none;
}

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

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 44px;
  }
  .page-about .about-rail {
    position: sticky;
    top: 118px;
    align-self: start;
  }
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }
  .page-about .about-rail__link {
    display: block;
    padding: 7px 0 7px 14px;
    border: 0;
    border-left: 2px solid var(--line);
    background: transparent;
  }
  .page-about .about-rail__link[aria-current] {
    border-left-color: var(--track);
    background: transparent;
  }
  .page-about .about-node:nth-child(odd) {
    width: 94%;
  }
  .page-about .about-node:nth-child(even) {
    width: 80%;
    margin-left: 10%;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-team__media {
  margin: 0;
}

.page-about .about-team__tiles {
  display: grid;
  gap: 10px;
  margin: 22px 0 20px;
}

.page-about .about-tile {
  background: var(--ink);
  color: var(--paper);
  padding: 16px 18px;
  clip-path: var(--about-notch);
}

.page-about .about-tile:nth-child(2) {
  background: var(--sage);
}

.page-about .about-tile:nth-child(3) {
  background: var(--grass);
}

.page-about .about-tile__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.9rem;
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-about .about-tile__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 245, 239, 0.85);
}

.page-about .about-team__judge {
  margin: 0;
  padding: 6px 0 6px 14px;
  border-left: 3px solid var(--track);
  font-size: 0.96rem;
  line-height: 1.85;
  max-width: 60ch;
}

.page-about .about-team__judge strong {
  color: var(--ink);
  font-weight: 800;
}

@media (min-width: 700px) {
  .page-about .about-team__tiles {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .about-tile:nth-child(1) {
    grid-column: 1 / 4;
  }
  .page-about .about-tile:nth-child(2) {
    grid-column: 4 / 7;
    margin-top: 28px;
  }
  .page-about .about-tile:nth-child(3) {
    grid-column: 2 / 6;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
  .page-about .about-team__media {
    margin-top: 56px;
  }
}

/* ---------- 合作单位 ---------- */
.page-about .about-wide-img {
  margin: 0 0 clamp(24px, 4vw, 42px);
}

.page-about .about-partners {
  max-width: 860px;
}

.page-about .about-sectors {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-sectors li {
  display: grid;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sectors__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  color: var(--grass);
  letter-spacing: 0.02em;
}

.page-about .about-sectors__desc {
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--text);
}

@media (min-width: 760px) {
  .page-about .about-sectors li {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

/* ---------- 办赛标准 ---------- */
.page-about .about-stdlist {
  border-top: 1px solid var(--line);
}

.page-about .about-std {
  border-bottom: 1px solid var(--line);
}

.page-about .about-std summary {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 12px;
  padding: 17px 2px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-std summary::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--sage);
  border-bottom: 2px solid var(--sage);
  transform: rotate(-45deg);
  justify-self: center;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-std[open] summary::after {
  transform: rotate(45deg);
  border-color: var(--track);
}

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

.page-about .about-std__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-std summary:hover .about-std__name {
  color: var(--grass);
}

.page-about .about-std__body {
  padding: 0 2px 20px 52px;
}

.page-about .about-std__body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  max-width: 64ch;
  color: var(--text);
}

@media (max-width: 640px) {
  .page-about .about-std__body {
    padding-left: 0;
  }
}

/* ---------- 结尾 ---------- */
.page-about .about-sec--end {
  background-color: var(--ink);
  background-image: radial-gradient(rgba(232, 255, 82, 0.12) 1px, transparent 1px);
  background-size: 12px 12px;
  color: var(--paper);
  padding-bottom: clamp(56px, 9vw, 110px);
}

.page-about .about-sec--end h2 {
  color: var(--paper);
}

.page-about .about-sec--end .eyebrow {
  color: var(--neon);
}

.page-about .about-sec--end p {
  color: rgba(247, 245, 239, 0.78);
  max-width: 54ch;
}

.page-about .about-end {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-end__links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(247, 245, 239, 0.18);
}

.page-about .about-end__links li {
  border-bottom: 1px solid rgba(247, 245, 239, 0.18);
}

.page-about .about-end__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 2px;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.98rem;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-end__links a::after {
  content: "→";
  color: var(--track);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.page-about .about-end__links a:hover {
  color: var(--neon);
  padding-left: 9px;
}

@media (min-width: 860px) {
  .page-about .about-end {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-divider,
  .page-about .about-rail__link,
  .page-about .about-end__links a,
  .page-about .about-std summary::after {
    transition: none;
  }
  .page-about .about-divider:hover {
    transform: none;
  }
}