.page-about {
  --about-line: rgba(154, 175, 166, 0.22);
  --about-line-strong: rgba(154, 175, 166, 0.4);
  --about-rail-w: 232px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(22px, 4vw, 40px) 0 clamp(40px, 6.5vw, 84px);
}

.page-about .about-hero__angles {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(70% 62% at 84% 2%, rgba(75, 232, 176, 0.17), transparent 62%),
    radial-gradient(62% 70% at 4% 98%, rgba(255, 138, 61, 0.13), transparent 66%),
    linear-gradient(104deg, rgba(23, 64, 47, 0.95) 0%, rgba(18, 49, 42, 0.5) 40%, rgba(11, 31, 26, 0) 70%);
  clip-path: polygon(0 0, 100% 0, 100% 56%, 76% 100%, 0 100%);
}

.page-about .about-hero__angles::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    116deg,
    rgba(75, 232, 176, 0.07) 0 1px,
    transparent 1px 94px
  );
}

.page-about .about-hero__kicker {
  color: var(--flux);
  margin: 24px 0 10px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: clamp(27px, 5.2vw, 56px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 0 0 18px;
  max-width: 19ch;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.85;
  color: rgba(242, 246, 243, 0.84);
  margin: 0 0 30px;
}

.page-about .about-hero__figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  max-width: 720px;
}

.page-about .about-hero__figures .kpi {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px;
  border-radius: var(--r-md);
  background: rgba(5, 18, 15, 0.55);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__figures .kpi__value {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.1vw, 23px);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--flux);
}

.page-about .about-hero__figures .kpi__key {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mute);
}

@media (min-width: 720px) {
  .page-about .about-hero__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-bottom: clamp(48px, 8vw, 100px);
}

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

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
  }
}

.page-about .about-rail {
  display: none;
}

@media (min-width: 1040px) {
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 110px;
    align-self: start;
  }
}

.page-about .about-rail__title {
  color: var(--mute);
  margin: 0 0 14px;
  padding-left: 2px;
}

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

.page-about .about-rail__list li {
  margin: 0;
}

.page-about .about-rail__list a {
  position: relative;
  display: block;
  padding: 9px 12px 9px 18px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--mute);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-rail__list a::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--flux);
  transform: translateY(-50%);
  transition: height var(--dur) var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--flux);
}

.page-about .about-rail__list a:hover::before,
.page-about .about-rail__list a:focus-visible::before {
  height: 100%;
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  border-top: 1px solid var(--about-line);
  padding-top: clamp(28px, 4vw, 52px);
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter + .chapter {
  margin-top: clamp(32px, 5vw, 62px);
}

.page-about .chapter__no {
  display: block;
  margin: 0 0 8px;
  color: var(--flux);
}

.page-about .chapter__title {
  font-family: var(--font-head);
  font-size: clamp(21px, 2.9vw, 33px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 20px;
  max-width: 26ch;
}

.page-about .chapter__body > p {
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 246, 243, 0.84);
  margin: 0 0 16px;
}

/* ---------- 年份时间轴 ---------- */
.page-about .yearline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 14px;
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .yearline::-webkit-scrollbar {
  height: 4px;
}

.page-about .yearline::-webkit-scrollbar-thumb {
  background: rgba(75, 232, 176, 0.3);
  border-radius: var(--r-pill);
}

.page-about .yearline__item {
  flex: 0 0 auto;
}

.page-about .yearline__node {
  display: flex;
  flex-direction: column;
  gap: 9px;
  min-width: 160px;
  max-width: 200px;
  padding: 16px 16px 18px;
  border-radius: var(--r-md);
  background: linear-gradient(165deg, rgba(23, 64, 47, 0.82), rgba(11, 31, 26, 0.42));
  border: 1px solid var(--about-line);
  text-decoration: none;
  scroll-snap-align: start;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .yearline__node::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: var(--r-pill);
  background: var(--flux);
  opacity: 0.55;
  transition: width var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-about .yearline__node:hover,
.page-about .yearline__node:focus-visible {
  border-color: rgba(75, 232, 176, 0.5);
  transform: translateY(-3px);
}

.page-about .yearline__node:hover::before,
.page-about .yearline__node:focus-visible::before {
  width: 44px;
  opacity: 1;
}

.page-about .yearline__year {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--flux);
}

.page-about .yearline__note {
  font-size: 13px;
  line-height: 1.62;
  color: var(--mute);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  gap: 26px;
  margin-top: 4px;
}

@media (min-width: 920px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 34px;
    align-items: start;
  }
}

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

.page-about .team-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 15px 18px;
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(23, 64, 47, 0.5), rgba(11, 31, 26, 0.26));
  border: 1px solid var(--about-line);
  transition: border-color var(--dur) var(--ease);
}

.page-about .team-card:hover {
  border-color: rgba(75, 232, 176, 0.4);
}

.page-about .team-card__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--flux);
  padding-top: 3px;
}

.page-about .team-card__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(242, 246, 243, 0.72);
}

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

.page-about .team-shot {
  margin: 0;
}

/* ---------- 工序 ---------- */
.page-about .flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 780px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .flow__step {
  position: relative;
  padding: 18px 18px 16px;
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(23, 64, 47, 0.44), rgba(11, 31, 26, 0.22));
  border: 1px solid var(--about-line);
  transition: border-color var(--dur) var(--ease);
}

.page-about .flow__step:hover,
.page-about .flow__step:focus-within {
  border-color: rgba(75, 232, 176, 0.44);
}

@media (min-width: 780px) {
  .page-about .flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 33px;
    right: -18px;
    width: 18px;
    border-top: 1px dashed var(--about-line-strong);
  }
}

.page-about .flow__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: 12px;
  border-radius: 50%;
  border: 1px solid rgba(75, 232, 176, 0.5);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--flux);
}

.page-about .flow__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .flow__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: rgba(242, 246, 243, 0.74);
}

.page-about .flow__extra {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.34s var(--ease), opacity 0.34s var(--ease), margin-top 0.34s var(--ease);
}

.page-about .flow__step:hover .flow__extra,
.page-about .flow__step:focus-within .flow__extra {
  max-height: 160px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .flow__extra span {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  line-height: 1.72;
  color: var(--amber-soft);
}

@media (hover: none) {
  .page-about .flow__extra {
    max-height: 200px;
    opacity: 1;
    margin-top: 12px;
  }
}

.page-about .workflow-shot {
  margin: 30px 0 0;
}

/* ---------- 版本 ---------- */
.page-about .version-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 10px 12px;
  border-radius: var(--r-md);
  background: rgba(5, 18, 15, 0.5);
  border: 1px solid var(--about-line);
}

.page-about .version-filter .filterbar__label {
  margin-right: 4px;
}

.page-about .version-filter .chip {
  padding: 7px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--about-line-strong);
  background: transparent;
  color: var(--mute);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .version-filter .chip:hover {
  color: var(--paper);
  border-color: rgba(75, 232, 176, 0.5);
}

.page-about .version-filter .chip[aria-pressed="true"] {
  background: var(--flux);
  border-color: var(--flux);
  color: #05120F;
  font-weight: 600;
}

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

.page-about .table-wrap {
  overflow-x: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  background: rgba(5, 18, 15, 0.32);
}

.page-about .version-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.page-about .version-table__cap {
  caption-side: top;
  text-align: left;
  padding: 14px 18px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.page-about .version-table th,
.page-about .version-table td {
  text-align: left;
  padding: 14px 18px;
  vertical-align: top;
  border-bottom: 1px solid var(--about-line);
  font-size: 14.5px;
  line-height: 1.72;
}

.page-about .version-table thead th {
  background: rgba(23, 64, 47, 0.55);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mute);
  white-space: nowrap;
}

.page-about .version-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .version-table tbody tr:hover td {
  background: rgba(23, 64, 47, 0.3);
}

.page-about .version-table .v-tag {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--flux);
  white-space: nowrap;
}

.page-about .version-table .v-key {
  font-weight: 600;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .version-table .v-desc {
  color: rgba(242, 246, 243, 0.74);
}

.page-about .version-shot {
  margin: 26px 0 0;
  max-width: 420px;
}

/* ---------- 伙伴 ---------- */
.page-about .partner-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  max-width: 440px;
  margin: 24px 0 0;
}

.page-about .partner-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, rgba(23, 64, 47, 0.6), rgba(11, 31, 26, 0.24));
}

.page-about .partner-stat__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--flux);
}

.page-about .partner-stat__key {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mute);
}

/* ---------- 表彰 ---------- */
.page-about .award-note {
  display: flex;
  gap: 16px;
  align-items: stretch;
  margin: 22px 0 0;
  padding: 20px 22px;
  border-radius: var(--r-md);
  border: 1px solid rgba(75, 232, 176, 0.3);
  background: linear-gradient(120deg, rgba(75, 232, 176, 0.09), rgba(11, 31, 26, 0.18) 62%);
}

.page-about .award-note::before {
  content: "";
  flex: 0 0 auto;
  width: 3px;
  border-radius: var(--r-pill);
  background: var(--flux);
}

.page-about .award-note p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 接着看 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

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

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 20px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  background: linear-gradient(170deg, rgba(23, 64, 47, 0.5), rgba(11, 31, 26, 0.2));
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: rgba(75, 232, 176, 0.5);
  transform: translateY(-3px);
}

.page-about .next-card__tag {
  color: var(--mute);
}

.page-about .next-card__title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.42;
  color: var(--paper);
}

.page-about .next-card__go {
  margin-top: auto;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--flux);
}

/* ---------- 窄屏收尾 ---------- */
@media (max-width: 520px) {
  .page-about .about-hero__title {
    max-width: none;
  }

  .page-about .version-filter {
    border-radius: var(--r-md);
  }

  .page-about .version-filter .chip {
    padding: 6px 13px;
    font-size: 12.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .yearline__node,
  .page-about .next-card,
  .page-about .flow__step {
    transition: none;
  }

  .page-about .yearline__node:hover,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}