.page-about {
  --about-rail-w: 190px;
  --about-gap: clamp(28px, 4vw, 64px);
  --about-text: #d9cfc1;
  --about-text-dim: #c3b8a9;
  background: var(--void);
  color: var(--bone);
  overflow-x: clip;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

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

.page-about .mono {
  font-family: var(--font-mono);
  color: var(--cyan);
  letter-spacing: 0.02em;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line-gobi);
  border-bottom: 1px solid var(--line-gobi);
  background:
    radial-gradient(90% 80% at 78% 0%, rgba(255, 90, 31, 0.18), transparent 62%),
    radial-gradient(70% 70% at 10% 100%, rgba(99, 211, 220, 0.1), transparent 66%),
    linear-gradient(180deg, #1a1512 0%, var(--void) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-block: clamp(34px, 5vw, 64px) clamp(30px, 5vw, 60px);
}

.page-about .about-hero__inner::before,
.page-about .about-hero__inner::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 1px solid var(--gobi);
  opacity: 0.65;
  pointer-events: none;
}

.page-about .about-hero__inner::before {
  top: 0;
  left: 0;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__inner::after {
  right: 0;
  bottom: 0;
  border-left: 0;
  border-top: 0;
}

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 6.2vw, 72px);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--bone);
  transform: skewX(-2.5deg);
  transform-origin: left bottom;
}

.page-about .about-hero__title em {
  display: block;
  margin-top: 8px;
  font-style: normal;
  color: var(--lava);
  font-size: 0.62em;
  line-height: 1.16;
}

.page-about .about-hero__lede {
  max-width: 30em;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--about-text-dim);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__meta li {
  padding-left: 9px;
  border-left: 2px solid var(--lava);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gobi);
}

.page-about .about-hero__fig {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-gobi);
  background: var(--archive);
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.95) contrast(1.06);
}

.page-about .about-hero__ghost {
  position: absolute;
  right: -3%;
  bottom: -8%;
  z-index: 1;
  font-family: var(--font-display);
  font-size: clamp(84px, 19vw, 210px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bone);
  opacity: 0.05;
  transform: skewX(-6deg);
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-block: clamp(36px, 6vw, 84px);
}

.page-about .about-rail {
  min-width: 0;
  border: 1px solid var(--line-gobi);
  background: rgba(36, 24, 19, 0.55);
  padding: 12px 14px;
}

.page-about .about-rail .rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gobi);
  text-transform: uppercase;
}

.page-about .about-rail .rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail .rail__link {
  display: block;
  padding: 7px 10px;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--ash);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail .rail__link:hover {
  color: var(--bone);
  border-bottom-color: var(--gobi);
}

.page-about .about-rail .rail__link.is-active {
  color: var(--lava);
  border-bottom-color: var(--lava);
}

.page-about .about-body {
  min-width: 0;
  display: grid;
  gap: clamp(38px, 5vw, 72px);
}

/* ---------- 单章 ---------- */
.page-about .about-chapter {
  min-width: 0;
  scroll-margin-top: 96px;
}

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

.page-about .about-chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lava);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 38px);
  font-weight: 500;
  line-height: 1.26;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-prose {
  min-width: 0;
  margin-top: clamp(16px, 2.4vw, 22px);
}

.page-about .about-chapter__grid .about-prose {
  margin-top: 0;
}

.page-about .about-prose p {
  max-width: 34em;
  margin: 0 0 15px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-text);
}

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

.page-about .about-list {
  max-width: 34em;
  margin: 16px 0 18px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text-dim);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 9px;
  height: 1px;
  background: var(--lava);
}

.page-about .about-list strong {
  color: var(--bone);
  font-weight: 600;
}

/* ---------- 旁注 ---------- */
.page-about .about-note {
  align-self: start;
  border: 1px solid var(--line-cyan);
  background: rgba(36, 24, 19, 0.85);
  padding: 16px 18px;
}

.page-about .about-note__k {
  display: block;
  margin-bottom: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-note p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ash);
}

/* ---------- 图片框 ---------- */
.page-about .about-fig {
  position: relative;
  margin: clamp(20px, 3vw, 30px) 0 0;
  border: 1px solid var(--line-gobi);
  background: var(--archive);
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-fig__cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line-gobi);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ash);
  background: rgba(17, 16, 15, 0.72);
}

/* ---------- 四阶段 ---------- */
.page-about .about-phases {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-phase {
  position: relative;
  padding: 18px 16px 20px 20px;
  border: 1px solid var(--line-ash);
  background: linear-gradient(180deg, rgba(36, 24, 19, 0.9), rgba(17, 16, 15, 0.92));
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-phase::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--phase-c, var(--gobi));
}

.page-about .about-phase:hover,
.page-about .about-phase:focus-within {
  border-color: var(--ember);
  transform: translateY(-3px);
  background: linear-gradient(180deg, rgba(255, 90, 31, 0.1), rgba(17, 16, 15, 0.95));
}

.page-about .about-phase--signup { --phase-c: var(--gobi); }
.page-about .about-phase--draw { --phase-c: var(--lava); }
.page-about .about-phase--season { --phase-c: var(--cyan); }
.page-about .about-phase--review { --phase-c: var(--ember); }

.page-about .about-phase__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--phase-c, var(--gobi));
}

.page-about .about-phase__name {
  margin: 6px 0 8px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.page-about .about-phase__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ash);
}

.page-about .about-phase__field {
  display: block;
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-ash);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--gobi);
}

/* ---------- 里程碑横向带 ---------- */
.page-about .about-milestones {
  margin-top: clamp(16px, 2.6vw, 24px);
  padding-bottom: 12px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--gobi) transparent;
}

.page-about .about-milestones::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-milestones::-webkit-scrollbar-thumb {
  background: var(--line-gobi);
}

.page-about .about-milestones__track {
  display: flex;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  scroll-snap-type: x proximity;
}

.page-about .about-mile {
  flex: 0 0 auto;
  width: min(260px, 76vw);
  padding: 16px;
  scroll-snap-align: start;
  border-top: 2px solid var(--gobi);
  background: rgba(36, 24, 19, 0.68);
}

.page-about .about-mile__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-mile__k {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--lava);
}

.page-about .about-mile__t {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ash);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line-ash);
  background: var(--line-ash);
}

.page-about .about-partner {
  padding: 18px 16px;
  background: var(--void);
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1;
  color: var(--gobi);
}

.page-about .about-partner__k {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--bone);
}

.page-about .about-partner__t {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ash);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  scroll-margin-top: 96px;
  padding: clamp(24px, 4vw, 46px);
  border: 1px solid var(--line-gobi);
  background:
    radial-gradient(120% 120% at 4% 0%, rgba(255, 90, 31, 0.2), transparent 58%),
    linear-gradient(160deg, rgba(36, 24, 19, 0.95), rgba(17, 16, 15, 0.96));
}

.page-about .about-next__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.2vw, 46px);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--bone);
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.page-about .about-next__lede {
  max-width: 30em;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text-dim);
}

.page-about .about-routes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-routes > li {
  display: flex;
}

.page-about .about-route {
  display: flex;
  flex-direction: column;
  gap: 7px;
  width: 100%;
  padding: 16px;
  border: 1px solid var(--line-ash);
  background: rgba(17, 16, 15, 0.55);
  text-decoration: none;
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-route:hover {
  border-color: var(--lava);
  background: rgba(255, 90, 31, 0.09);
  transform: translateY(-2px);
}

.page-about .about-route__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gobi);
}

.page-about .about-route__t {
  font-size: 17px;
  font-weight: 600;
  color: var(--bone);
}

.page-about .about-route__d {
  font-size: 13px;
  line-height: 1.72;
  color: var(--ash);
}

.page-about .about-next__actions {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-phases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 248px);
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
    align-self: start;
    padding: 16px 14px;
  }

  .page-about .about-rail .rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-rail .rail__link {
    padding: 9px 0 9px 12px;
    border-bottom: 0;
    border-left: 1px solid var(--line-ash);
    white-space: normal;
  }

  .page-about .about-rail .rail__link:hover {
    border-left-color: var(--gobi);
  }

  .page-about .about-rail .rail__link.is-active {
    border-left-color: var(--lava);
    border-bottom-color: transparent;
    background: linear-gradient(90deg, rgba(255, 90, 31, 0.12), transparent 85%);
  }
}

@media (min-width: 1100px) {
  .page-about .about-phases {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-phase,
  .page-about .about-route,
  .page-about .about-rail .rail__link {
    transition: none;
  }

  .page-about .about-phase:hover,
  .page-about .about-phase:focus-within,
  .page-about .about-route:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>