.page-about {
  --about-gap: clamp(18px, 2.6vw, 34px);
}

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

.page-about .yb-media {
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: var(--r-panel);
  background: var(--panel);
}

.page-about .yb-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__media img {
  aspect-ratio: 16 / 9;
}

.page-about .about-manual__media img {
  aspect-ratio: 4 / 3;
}

.page-about .about-track__media img {
  aspect-ratio: 3 / 2;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero .yb-crumb {
  margin-bottom: clamp(14px, 2.2vw, 24px);
}

.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5.4vw, 60px) clamp(20px, 4.6vw, 58px) clamp(24px, 4vw, 48px);
  border: 1px solid var(--rule);
  border-radius: var(--r-panel);
  background:
    radial-gradient(120% 140% at 10% 0%, rgba(78, 107, 84, 0.24), transparent 62%),
    linear-gradient(180deg, rgba(16, 32, 27, 0.94), rgba(10, 14, 13, 0.88));
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 12px;
  background-image: repeating-linear-gradient(90deg, var(--rule) 0 1px, transparent 1px 16px);
  opacity: 0.85;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: 22px;
  right: 22px;
  width: 14px;
  height: 14px;
  border-top: 1px solid var(--cyan);
  border-right: 1px solid var(--cyan);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--panel);
}

.page-about .about-hero__k {
  font-family: var(--font-mono);
  font-size: clamp(26px, 6.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-hero__v {
  font-size: 14px;
  line-height: 1.7;
  color: var(--dim);
}

.page-about .about-hero__media {
  margin: clamp(20px, 3vw, 34px) 0 0;
}

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 范围 ---------- */
.page-about .about-why__grid {
  display: grid;
  gap: var(--about-gap);
}

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

.page-about .about-why__points li {
  position: relative;
  padding: 18px 18px 18px 34px;
  background: var(--ink);
  font-size: 15px;
  line-height: 1.9;
  color: var(--dim);
}

.page-about .about-why__points li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 26px;
  width: 7px;
  height: 7px;
  background: var(--moss);
  transition: background var(--dur) ease;
}

.page-about .about-why__points li:hover::before {
  background: var(--cyan);
}

@media (min-width: 900px) {
  .page-about .about-why__grid {
    grid-template-columns: 1.05fr 1fr;
    align-items: start;
  }
}

/* ---------- 两条轴线 ---------- */
.page-about .about-axis__head {
  max-width: 72ch;
}

.page-about .about-axis__cols {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .about-axis__panel {
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-axis__hint {
  margin: 8px 0 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--dim-2);
}

.page-about .about-axis__seasons {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-axis__seasons li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  padding: 15px 0;
  border-top: 1px solid var(--rule);
}

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

.page-about .about-axis__s-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-axis__s-name + .yb-tag {
  margin-left: auto;
}

.page-about .about-axis__ranks {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-axis__rank {
  display: grid;
  grid-template-columns: 54px 1fr auto;
  grid-template-areas:
    "tag label count"
    "bar bar bar";
  gap: 8px 12px;
  align-items: center;
  padding: 15px 0;
  border-top: 1px solid var(--rule);
}

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

.page-about .about-axis__tag {
  grid-area: tag;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--clay);
}

.page-about .about-axis__label {
  grid-area: label;
  font-size: 14px;
  color: var(--dim);
}

.page-about .about-axis__count {
  grid-area: count;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--dim-2);
}

.page-about .about-axis__count b {
  font-size: 18px;
  color: var(--lime);
}

.page-about .about-axis__bar {
  grid-area: bar;
  display: block;
  height: 8px;
  border: 1px solid var(--rule);
  border-radius: var(--r-cap);
  background: rgba(241, 243, 236, 0.05);
  overflow: hidden;
}

.page-about .about-axis__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--moss), var(--cyan));
}

.page-about .about-axis__fill--a { width: 100%; }
.page-about .about-axis__fill--b { width: 72%; }
.page-about .about-axis__fill--c { width: 51%; }
.page-about .about-axis__fill--d { width: 22%; }

.page-about .about-axis__foot {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--dim-2);
}

@media (min-width: 900px) {
  .page-about .about-axis__cols {
    grid-template-columns: 1fr 1.15fr;
    align-items: start;
  }
}

/* ---------- 口径手册 ---------- */
.page-about .about-manual__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .about-manual__list {
  margin: 0;
  counter-reset: manual;
}

.page-about .about-manual__item {
  position: relative;
  counter-increment: manual;
  padding: 20px 0 20px 58px;
  border-top: 1px solid var(--rule);
}

.page-about .about-manual__item:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-manual__item::before {
  content: counter(manual, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 24px;
  width: 42px;
  padding-left: 10px;
  border-left: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--clay);
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-manual__item:hover::before {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .about-manual__item dt {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-manual__item dd {
  margin: 8px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--dim);
}

.page-about .about-manual__aside {
  display: grid;
  gap: var(--about-gap);
  align-content: start;
}

.page-about .about-range__cap {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-about .about-range__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-range__list li {
  padding: 7px 13px;
  border: 1px solid var(--rule);
  border-radius: var(--r-cap);
  background: var(--glass);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  transition: border-color var(--dur) ease;
}

.page-about .about-range__list li:hover {
  border-color: var(--cyan);
}

.page-about .about-scale {
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--rule);
}

.page-about .about-scale__head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: baseline;
  margin-bottom: 18px;
}

.page-about .about-scale__cap {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-scale__note {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--dim-2);
}

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

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
  transition: border-color var(--dur) ease;
}

.page-about .about-scale__item:hover {
  border-top-color: var(--cyan);
}

.page-about .about-scale__item::after {
  content: "";
  height: 12px;
  background-image: repeating-linear-gradient(90deg, var(--rule) 0 1px, transparent 1px 9px);
}

.page-about .about-scale__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--clay);
}

.page-about .about-scale__name {
  font-size: 15px;
  color: var(--paper);
}

@media (min-width: 720px) {
  .page-about .about-scale__list {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-manual__grid {
    grid-template-columns: 1.35fr 1fr;
    align-items: start;
  }

  .page-about .about-scale__list {
    grid-template-columns: repeat(6, 1fr);
  }
}

/* ---------- 版本演进时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0 0 0 28px;
  display: grid;
  gap: 14px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay) 0%, var(--rule) 32%, var(--rule) 100%);
}

.page-about .about-timeline > li {
  position: relative;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--clay);
}

.page-about .about-stage {
  border: 1px solid var(--rule);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(16, 32, 27, 0.88), rgba(16, 32, 27, 0.6));
  transition: border-color var(--dur) ease;
}

.page-about .about-stage[open] {
  border-color: rgba(63, 224, 206, 0.42);
}

.page-about .about-stage__head {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 18px 20px;
}

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

.page-about .about-stage__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.page-about .about-stage[open] .about-stage__head::after {
  content: "–";
}

.page-about .about-stage__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-about .about-stage__name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-stage__body {
  padding: 0 20px 20px;
}

.page-about .about-stage__body .yb-text {
  margin: 0;
}

.page-about .about-track__media {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-timeline > li::before {
    left: -31px;
  }

  .page-about .about-timeline > li:nth-child(odd) {
    width: 96%;
  }

  .page-about .about-timeline > li:nth-child(even) {
    width: 82%;
    margin-left: auto;
  }
}

/* ---------- 分工 ---------- */
.page-about .about-roles__grid {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--r-panel);
  overflow: hidden;
}

.page-about .about-roles__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px;
  background: var(--panel);
  transition: background var(--dur) ease;
}

.page-about .about-roles__card:hover {
  background: rgba(16, 32, 27, 0.72);
}

.page-about .about-roles__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 8vw, 54px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-roles__role {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-roles__desc {
  font-size: 14px;
  line-height: 1.9;
  color: var(--dim);
}

.page-about .about-clock {
  display: grid;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-clock__item {
  display: grid;
  gap: 6px;
  padding: 14px 18px;
  border-left: 2px solid var(--moss);
  border-radius: 0 12px 12px 0;
  background: var(--glass);
  transition: border-color var(--dur) ease;
}

.page-about .about-clock__item:hover {
  border-left-color: var(--cyan);
}

.page-about .about-clock__k {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--lime);
}

.page-about .about-clock__v {
  font-size: 14px;
  line-height: 1.8;
  color: var(--dim);
}

@media (min-width: 720px) {
  .page-about .about-roles__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-clock {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1040px) {
  .page-about .about-clock {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- 合作与勘误 ---------- */
.page-about .about-trust__grid {
  display: grid;
  gap: var(--about-gap);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--rule);
  border-radius: var(--r-panel);
  background: linear-gradient(160deg, rgba(16, 32, 27, 0.9), rgba(10, 14, 13, 0.92));
}

.page-about .about-trust__cta {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
}

.page-about .about-fix {
  list-style: none;
  counter-reset: fix;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-fix li {
  position: relative;
  counter-increment: fix;
  padding: 14px 16px 14px 52px;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--glass);
  font-size: 14px;
  line-height: 1.9;
  color: var(--dim);
  transition: border-color var(--dur) ease;
}

.page-about .about-fix li:hover {
  border-color: rgba(192, 69, 58, 0.6);
}

.page-about .about-fix li::before {
  content: counter(fix, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--red);
}

@media (min-width: 900px) {
  .page-about .about-trust__grid {
    grid-template-columns: 1.1fr 1fr;
    align-items: start;
  }
}

/* ---------- 后续入口 ---------- */
.page-about .about-next__panel {
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--rule);
  border-top: 2px solid var(--cyan);
  border-radius: var(--r-panel);
  background: var(--panel);
}

.page-about .about-next__links {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.page-about .about-next__links li {
  background: var(--panel);
}

.page-about .about-next__links a {
  display: block;
  padding: 16px 6px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper);
  text-decoration: none;
  transition: color var(--dur) ease, padding-left var(--dur) ease;
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  color: var(--cyan);
  padding-left: 14px;
}

@media (min-width: 900px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
  }
}
<<<END>>>