.page-about {
  --about-para: #C3CCD9;
  --about-line: var(--grid-line);
}

.page-about .about-h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 3.8vw, 44px);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--text);
  margin: 12px 0 0;
  overflow-wrap: break-word;
}

.page-about p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  color: var(--about-para);
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(36px, 7vw, 88px) 0 clamp(28px, 5vw, 64px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
  align-items: end;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6.2vw, 72px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--text);
  margin: 18px 0 0;
  overflow-wrap: break-word;
}

.page-about .about-hero__lede {
  max-width: var(--read);
  margin: 24px 0 0;
  font-size: 17px;
  color: var(--about-para);
}

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

.page-about .about-figure {
  background: var(--ink-2);
  padding: 18px 16px 20px;
}

.page-about .about-figure dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-figure dd {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 34px);
  letter-spacing: -0.02em;
  color: var(--accent);
  margin: 10px 0 0;
}

.page-about .about-figure dd span {
  font-size: 0.55em;
  margin-left: 2px;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(40px, 6vw, 88px);
  }
  .page-about .about-hero__title {
    transform: skewX(-1.4deg);
    transform-origin: left bottom;
  }
}

/* ---------- 图片框 ---------- */
.page-about .about-frame {
  margin: 0;
  border: 1px solid var(--about-line);
  background:
    linear-gradient(135deg, var(--ink-2) 0%, var(--ink-3) 62%, rgba(var(--signal-rgb), 0.08) 100%);
  overflow: hidden;
}

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

.page-about .about-frame figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--muted);
  padding: 12px 14px;
  border-top: 1px solid var(--about-line);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-origin__copy p {
  margin: 18px 0 0;
}

.page-about .about-origin__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-origin__list li {
  position: relative;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  padding: 14px 0 14px 26px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-origin__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 12px;
  height: 2px;
  background: var(--accent);
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(40px, 6vw, 80px);
    align-items: center;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
}

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

.page-about .about-timeline__intro {
  max-width: var(--read);
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-timeline__head {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 32px 0 0;
}

.page-about .about-index a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--muted);
  text-decoration: none;
  padding: 7px 11px;
  border: 1px solid var(--about-line);
  transition: color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

.page-about .about-timeline__media {
  margin: 32px 0 0;
}

.page-about .about-timeline__media img {
  height: clamp(150px, 22vw, 260px);
  object-fit: cover;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 0 0 clamp(32px, 5vw, 56px) 24px;
  border-left: 1px solid var(--about-line);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.14);
}

.page-about .about-timeline__item:nth-child(even)::before {
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(var(--signal-rgb), 0.16);
}

.page-about .about-timeline__item:target::before {
  background: var(--yellow);
  box-shadow: 0 0 0 6px rgba(242, 201, 76, 0.2);
}

.page-about .about-timeline__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-timeline__ver {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--accent);
}

.page-about .about-timeline__stage {
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
  border: 1px solid var(--about-line);
  padding: 3px 8px;
}

.page-about .about-timeline__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.3;
  color: var(--text);
  margin: 0;
}

.page-about .about-timeline__content p {
  margin: 12px 0 0;
  max-width: 66ch;
}

.page-about .about-timeline__content .expand {
  margin-top: 16px;
}

@media (min-width: 780px) {
  .page-about .about-timeline__item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 32px;
    padding-left: 34px;
  }
  .page-about .about-timeline__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__head {
  max-width: var(--read);
}

.page-about .about-team__intro {
  margin: 18px 0 0;
}

.page-about .about-team__grid {
  display: grid;
  gap: 40px;
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-role {
  position: relative;
  background: var(--ink);
  padding: 22px 20px 24px 64px;
  transition: background var(--dur-2) var(--ease), box-shadow var(--dur-2) var(--ease);
}

.page-about .about-role:hover {
  background: var(--ink-2);
  box-shadow: inset 3px 0 0 var(--accent);
}

.page-about .about-role__index {
  position: absolute;
  left: 20px;
  top: 24px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.page-about .about-role__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--text);
  margin: 0;
}

.page-about .about-role__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.68;
}

.page-about .about-team__frame {
  align-self: start;
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }
}

/* ---------- 双板块 ---------- */
.page-about .about-versions__head {
  max-width: var(--read);
}

.page-about .about-versions__intro {
  margin: 18px 0 0;
}

.page-about .about-versions__grid {
  display: grid;
  gap: 20px;
  margin-top: clamp(32px, 5vw, 52px);
}

.page-about .about-version {
  position: relative;
  padding: 28px 24px 30px;
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-version::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.page-about .about-version--stable {
  background:
    linear-gradient(150deg, rgba(var(--accent-rgb), 0.14) 0%, rgba(var(--accent-rgb), 0.02) 42%, var(--ink-3) 100%);
}

.page-about .about-version--stable::after {
  background-image:
    linear-gradient(to right, var(--about-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.55;
}

.page-about .about-version--legacy {
  background:
    linear-gradient(150deg, var(--legacy-deep) 0%, #1A0B12 55%, var(--ink-3) 100%);
  border-color: rgba(142, 42, 53, 0.55);
}

.page-about .about-version--legacy::after {
  background-image: radial-gradient(rgba(242, 201, 76, 0.14) 1px, transparent 1px);
  background-size: 6px 6px;
  opacity: 0.6;
}

.page-about .about-version > * {
  position: relative;
  z-index: 1;
}

.page-about .about-version__tag {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin: 0;
  padding: 5px 10px;
  border: 1px solid var(--accent);
  color: var(--accent);
}

.page-about .about-version--legacy .about-version__tag {
  border-color: var(--yellow);
  color: var(--yellow);
}

.page-about .about-version h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.34;
  color: var(--text);
  margin: 18px 0 0;
}

.page-about .about-version ul {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .about-version li {
  position: relative;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.66;
  color: var(--about-para);
  padding: 11px 0 11px 20px;
  border-top: 1px solid rgba(30, 45, 69, 0.9);
}

.page-about .about-version--legacy li {
  border-top-color: rgba(142, 42, 53, 0.45);
}

.page-about .about-version li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 8px;
  height: 1px;
  background: var(--accent);
}

.page-about .about-version--legacy li::before {
  background: var(--yellow);
  width: 5px;
  height: 5px;
  top: 20px;
}

.page-about .about-versions__note {
  margin: 26px 0 0;
  max-width: var(--read);
  padding-left: 16px;
  border-left: 2px solid var(--signal);
  font-size: 15px;
}

@media (min-width: 860px) {
  .page-about .about-versions__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
  .page-about .about-versions__grid > .about-version:first-child {
    margin-top: 0;
  }
  .page-about .about-versions__grid > .about-version:last-child {
    margin-top: 48px;
  }
}

/* ---------- 生态协作 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: 40px;
  align-items: start;
}

.page-about .about-eco__copy p {
  margin: 18px 0 0;
  max-width: var(--read);
}

.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-eco__list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  background: rgba(10, 15, 26, 0.6);
  padding: 20px 18px;
}

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.02em;
  color: var(--signal);
  min-width: 2ch;
}

.page-about .about-eco__label {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
}

@media (min-width: 900px) {
  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(40px, 6vw, 80px);
  }
}

/* ---------- 赛季节奏 ---------- */
.page-about .about-rhythm__head {
  max-width: var(--read);
}

.page-about .about-rhythm__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(32px, 5vw, 52px);
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-rhythm__item {
  background: var(--ink-2);
  padding: 26px 22px 28px;
  border-top: 2px solid transparent;
  transition: border-color var(--dur-2) var(--ease), background var(--dur-2) var(--ease);
}

.page-about .about-rhythm__item:hover {
  background: var(--ink-3);
  border-top-color: var(--accent);
}

.page-about .about-rhythm__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 38px);
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-rhythm__item p {
  margin: 14px 0 0;
  font-size: 15px;
}

.page-about .about-rhythm__note {
  margin: clamp(28px, 4vw, 44px) 0 0;
  max-width: var(--read);
  padding: 20px 22px;
  background: linear-gradient(120deg, rgba(var(--accent-rgb), 0.1), rgba(var(--signal-rgb), 0.06) 70%, transparent);
  border-left: 2px solid var(--accent);
  font-size: 15px;
}

@media (min-width: 760px) {
  .page-about .about-rhythm__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  border-top: 1px solid var(--about-line);
  padding-top: clamp(28px, 4vw, 48px);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-next__links .btn {
  text-decoration: none;
}

@media (max-width: 560px) {
  .page-about .about-figures {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-role {
    padding-left: 58px;
  }
  .page-about .about-eco__list li {
    flex-direction: column;
    gap: 6px;
  }
  .page-about .about-timeline__media img {
    height: 160px;
  }
}