.page-about {
  --about-rail: 132px;
  --about-gap: 48px;
  background: var(--ky-field);
  color: var(--ky-chalk);
}

.page-about .ky-prose {
  color: var(--ky-chalk);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 40px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--ky-line);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(31, 92, 74, 0.42) 0%, rgba(7, 27, 22, 0) 58%),
    linear-gradient(180deg, rgba(14, 51, 42, 0.86), rgba(7, 27, 22, 0.96));
  padding: clamp(24px, 5vw, 60px) clamp(20px, 4.5vw, 56px);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid var(--ky-signal);
  opacity: 0.7;
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-stripe {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg,
    var(--ky-signal) 0 34%,
    var(--ky-amber) 34% 67%,
    var(--ky-alert) 67% 100%);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--ky-font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-size: clamp(28px, 5vw, 54px);
  max-width: 22ch;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  color: rgba(237, 244, 240, 0.84);
}

.page-about .about-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 1px;
  background: var(--ky-line-soft);
  border: 1px solid var(--ky-line-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ky-field);
}

.page-about .about-stat__num {
  font-family: var(--ky-font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1;
  color: var(--ky-signal);
  border-bottom: 2px solid rgba(69, 240, 196, 0.35);
  align-self: flex-start;
  padding-bottom: 4px;
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(44px, 6vw, 92px) 0;
  border-top: 1px solid var(--ky-line-soft);
}

.page-about .about-chapter--alt {
  background: linear-gradient(180deg, rgba(14, 51, 42, 0.55), rgba(7, 27, 22, 0.2));
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-family: var(--ky-font-serif);
  font-size: clamp(38px, 7vw, 62px);
  line-height: 1;
  color: var(--ky-chalk);
  opacity: 0.28;
  text-decoration: none;
  transition: opacity 240ms var(--ky-ease), color 240ms var(--ky-ease);
}

.page-about .about-chapter__num:hover,
.page-about .about-chapter__num:focus-visible {
  opacity: 1;
  color: var(--ky-signal);
}

.page-about .about-chapter__tag {
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ky-mute);
}

.page-about .about-chapter__mark {
  font-family: var(--ky-font-mono);
  font-size: 13px;
  color: var(--ky-amber);
  margin-left: auto;
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--ky-font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.16;
  font-size: clamp(22px, 3.4vw, 34px);
  color: var(--ky-chalk);
}

.page-about .about-chapter__body > .ky-prose {
  margin-top: 20px;
  max-width: 68ch;
}

.page-about .about-chapter__body > .ky-prose + .ky-prose {
  margin-top: 14px;
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 22px;
}

.page-about .about-split__text .ky-prose {
  margin: 0 0 14px;
  max-width: 62ch;
}

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

/* ---------- 角色分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 16px;
  padding: 18px 20px;
  background: var(--ky-stand);
  border-left: 2px solid var(--ky-moss);
  border-top: 1px solid var(--ky-line-soft);
}

.page-about .about-role__name {
  font-family: var(--ky-font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--ky-chalk);
}

.page-about .about-role__count {
  font-family: var(--ky-font-mono);
  font-size: 14px;
  color: var(--ky-amber);
}

.page-about .about-role__bar {
  grid-column: 1 / -1;
  display: block;
  height: 3px;
  background: rgba(31, 92, 74, 0.35);
}

.page-about .about-role__bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--ky-signal), rgba(69, 240, 196, 0.25));
}

.page-about .about-role__out {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ky-mute);
}

/* ---------- 流程刻度 ---------- */
.page-about .about-track {
  margin: 28px 0 6px;
}

.page-about .about-track__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-track__svg .t-base {
  stroke: var(--ky-line);
  stroke-width: 1;
}

.page-about .about-track__svg .t-tick {
  stroke: var(--ky-line-soft);
  stroke-width: 1;
}

.page-about .about-track__svg .t-mark {
  fill: var(--ky-signal);
}

.page-about .about-track__svg .t-mark--end {
  fill: var(--ky-amber);
}

.page-about .about-track__labels {
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin: 4px 0 0;
  padding: 0;
  font-family: var(--ky-font-mono);
  font-size: 11px;
  color: var(--ky-mute);
}

.page-about .about-track__labels li:last-child {
  color: var(--ky-amber);
  text-align: right;
}

/* ---------- 标签页与面板 ---------- */
.page-about .about-flow {
  margin-top: 22px;
}

.page-about .about-flow__panel,
.page-about .about-index__panel {
  padding: 20px 0 0;
  border-top: 1px solid var(--ky-line-soft);
}

.page-about .about-flow__panel p {
  margin: 0;
  max-width: 66ch;
  color: rgba(237, 244, 240, 0.88);
  line-height: 1.75;
}

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

/* ---------- 索引档位 ---------- */
.page-about .about-index {
  margin-top: 24px;
}

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

.page-about .about-index__item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  grid-template-areas:
    "key name"
    "key desc";
  gap: 2px 14px;
  padding: 14px 16px;
  background: var(--ky-field);
}

.page-about .about-index__key {
  grid-area: key;
  font-family: var(--ky-font-mono);
  font-size: 15px;
  color: var(--ky-amber);
  padding-top: 2px;
}

.page-about .about-index__name {
  grid-area: name;
  font-family: var(--ky-font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--ky-chalk);
}

.page-about .about-index__desc {
  grid-area: desc;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ky-mute);
}

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

/* ---------- 覆盖表与版本 ---------- */
.page-about .about-coverage {
  margin-top: 26px;
}

.page-about .about-coverage__caption {
  caption-side: top;
  text-align: left;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ky-mute);
  padding-bottom: 10px;
}

.page-about .about-version {
  margin-top: 26px;
  color: #21302b;
}

.page-about .about-version p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-version__kicker {
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #6b7a72 !important;
  margin-bottom: 10px !important;
}

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

.page-about .about-partner {
  padding: 20px;
  border: 1px solid var(--ky-line);
  background: rgba(19, 42, 51, 0.55);
}

.page-about .about-partner__name {
  margin: 0;
  font-family: var(--ky-font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--ky-signal);
}

.page-about .about-partner__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(237, 244, 240, 0.8);
}

.page-about .about-prose-link {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ky-mute);
}

.page-about .about-prose-link a {
  color: var(--ky-signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(69, 240, 196, 0.4);
}

.page-about .about-prose-link a:hover,
.page-about .about-prose-link a:focus-visible {
  border-bottom-color: var(--ky-signal);
}

/* ---------- 读者场景 ---------- */
.page-about .about-readers {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 26px;
  background: var(--ky-line-soft);
}

.page-about .about-reader {
  padding: 22px 20px;
  background: var(--ky-field);
  border-top: 2px solid transparent;
  border-image: linear-gradient(90deg, var(--ky-signal), rgba(69, 240, 196, 0)) 1;
}

.page-about .about-reader__name {
  margin: 0;
  font-family: var(--ky-font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--ky-chalk);
}

.page-about .about-reader__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ky-mute);
}

/* ---------- 结尾 ---------- */
.page-about .about-outro {
  padding: clamp(56px, 8vw, 120px) 0 clamp(48px, 7vw, 110px);
  border-top: 1px solid var(--ky-line-soft);
}

.page-about .about-outro__inner {
  max-width: 720px;
}

.page-about .about-outro__title {
  margin: 0;
  font-family: var(--ky-font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
  font-size: clamp(24px, 4vw, 40px);
  color: var(--ky-chalk);
}

.page-about .about-outro__text {
  margin: 18px 0 0;
  max-width: 60ch;
  color: rgba(237, 244, 240, 0.8);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-readers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-right: 18px;
    border-right: 1px solid var(--ky-line-soft);
  }

  .page-about .about-chapter__mark {
    margin-left: 0;
    margin-top: 10px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 34px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-chapter__body > .ky-prose {
    font-size: 17px;
  }
}

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