.page-about {
  --about-rail: 208px;
  --about-cut: 18px;
  background: var(--green-night);
  color: var(--white);
  overflow-x: clip;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(20px, 3vw, 40px) clamp(40px, 6vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 150%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 68% at 80% 10%, rgba(255, 90, 31, 0.20), transparent 62%),
    radial-gradient(50% 60% at 6% 62%, rgba(56, 200, 255, 0.11), transparent 66%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.55;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(234, 243, 240, 0.045) 0 1px,
    transparent 1px 68px
  );
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  letter-spacing: -0.012em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--green-line);
  background: linear-gradient(160deg, var(--green-panel), var(--score-black));
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--about-cut)),
    calc(100% - var(--about-cut)) 100%,
    0 100%
  );
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: clamp(32px, 4.5vw, 64px);
  }
}

/* ---------- 正文骨架与左侧索引 ---------- */

.page-about .about-body {
  padding-block: clamp(32px, 5vw, 72px) clamp(48px, 7vw, 96px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-rail {
  border-top: 1px solid var(--green-line);
  padding-top: 14px;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--green-line);
  background: rgba(18, 46, 38, 0.6);
  color: var(--white);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-rail__list a:hover {
  border-color: var(--orange);
  background: rgba(30, 74, 60, 0.7);
}

.page-about .about-rail__no {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--arc);
}

@media (min-width: 1024px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list a {
    width: 100%;
    border-color: transparent;
    border-left: 2px solid var(--green-line);
    background: transparent;
    border-radius: 0;
  }

  .page-about .about-rail__list a:hover {
    border-left-color: var(--orange);
    background: rgba(18, 46, 38, 0.75);
  }
}

/* ---------- 章节 ---------- */

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(40px, 6vw, 88px);
  min-width: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 18px;
  margin-bottom: 18px;
  border-top: 1px solid var(--green-line);
}

.page-about .about-chapter__no {
  font-family: var(--font-num);
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-chapter__head h2 {
  margin: 0;
}

.page-about .about-chapter__lede {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .prose {
  max-width: 68ch;
}

.page-about .prose p {
  margin: 0 0 1.1em;
  font-size: 17px;
  line-height: 1.85;
}

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

.page-about .about-quote {
  margin: 28px 0 0;
  padding: clamp(20px, 3vw, 30px) clamp(22px, 3vw, 34px);
  background: var(--green-panel);
  border-left: 3px solid var(--orange);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 22px),
    calc(100% - 22px) 100%,
    0 100%
  );
}

.page-about .about-quote p {
  margin: 0;
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 700;
  line-height: 1.7;
  color: var(--white);
}

/* ---------- 工序步骤条 ---------- */

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

.page-about .about-step {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--green-line);
  background: linear-gradient(180deg, rgba(18, 46, 38, 0.92), rgba(11, 31, 26, 0.92));
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 16px),
    calc(100% - 16px) 100%,
    0 100%
  );
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  opacity: 0.35;
  background: linear-gradient(90deg, var(--orange), var(--orange-ember), transparent);
  transition: opacity 0.3s var(--ease);
}

.page-about .about-step:hover {
  border-color: rgba(255, 90, 31, 0.7);
  transform: translateY(-3px);
}

.page-about .about-step:hover::before {
  opacity: 1;
}

.page-about .about-step__no {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--arc);
}

.page-about .about-step__title {
  margin: 8px 0 10px;
  font-size: 20px;
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-step__time {
  display: inline-block;
  margin-top: 16px;
  padding: 4px 10px;
  border: 1px solid rgba(255, 194, 75, 0.45);
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--amber);
}

@media (min-width: 700px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 通用图框 ---------- */

.page-about .about-figure {
  margin: 28px 0 0;
  border: 1px solid var(--green-line);
  background: var(--green-panel);
  overflow: hidden;
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 24px),
    calc(100% - 24px) 100%,
    0 100%
  );
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px 16px;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--mist);
}

/* ---------- 团队数据条 ---------- */

.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-team__row {
  padding: 20px;
  border: 1px solid var(--green-line);
  border-top: 2px solid var(--green-line);
  background: rgba(18, 46, 38, 0.62);
  transition: border-top-color 0.3s var(--ease);
}

.page-about .about-team__row:hover {
  border-top-color: var(--orange);
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team__count {
  font-family: var(--font-num);
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-team__row .meter {
  margin-top: 14px;
}

.page-about .about-team__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

/* ---------- 赛事线覆盖 ---------- */

.page-about .about-coverage {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-coverage li {
  position: relative;
  padding: 22px 20px 24px 24px;
  border: 1px solid var(--green-line);
  background: rgba(18, 46, 38, 0.55);
}

.page-about .about-coverage li::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--arc), rgba(56, 200, 255, 0));
}

.page-about .about-coverage h3 {
  margin: 0 0 10px;
  font-size: 18px;
  color: var(--white);
}

.page-about .about-coverage p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-coverage__note {
  margin-top: 24px;
}

@media (min-width: 820px) {
  .page-about .about-coverage {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 版本代际 ---------- */

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

.page-about .about-version {
  border: 1px solid var(--green-line);
  background: var(--green-panel);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 16px),
    calc(100% - 16px) 100%,
    0 100%
  );
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-version[open] {
  background: rgba(30, 74, 60, 0.72);
  border-color: rgba(255, 90, 31, 0.5);
}

.page-about .about-version summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-version summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 22px;
  line-height: 1;
  color: var(--orange);
}

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

.page-about .about-version__tag {
  font-family: var(--font-num);
  font-size: 22px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
  min-width: 48px;
}

.page-about .about-version__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-version__body {
  padding: 16px 20px 20px;
  border-top: 1px solid var(--green-line);
}

.page-about .about-version__body ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .about-version__body li {
  margin-bottom: 8px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* ---------- 去向卡 ---------- */

.page-about .about-next {
  margin-top: clamp(8px, 2vw, 20px);
  padding-top: 32px;
  border-top: 1px solid var(--green-line);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  border: 1px solid var(--green-line);
  background: linear-gradient(180deg, rgba(18, 46, 38, 0.85), rgba(11, 31, 26, 0.9));
  color: var(--white);
  text-decoration: none;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-next__card:hover {
  border-color: var(--orange);
  transform: translateY(-3px);
}

.page-about .about-next__kicker {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--arc);
}

.page-about .about-next__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
}

@media (min-width: 760px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-next__card,
  .page-about .about-version,
  .page-about .about-rail__list a {
    transition: none;
  }

  .page-about .about-step:hover,
  .page-about .about-next__card:hover {
    transform: none;
  }
}