.page-about {
  --about-aside: 100%;
  --tier-main: var(--cyan);
  --tier-compat: var(--amber);
  --tier-maint: var(--cyan-deep);
  --tier-archive: var(--muted);
  background: var(--ink);
  color: var(--fg);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(24px, 4vw, 44px) clamp(44px, 6vw, 84px);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(158deg, rgba(53, 224, 240, 0.11) 0%, rgba(53, 224, 240, 0) 44%),
    linear-gradient(302deg, rgba(240, 179, 90, 0.13) 0%, rgba(240, 179, 90, 0) 48%),
    var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: 0.22;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 82%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 82%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 52%;
  right: -12%;
  bottom: -46%;
  height: 62%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--amber) 100%);
  opacity: 0.13;
  clip-path: polygon(14% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 48px);
}

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

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 7vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -0.005em;
  color: var(--fg-strong);
  margin: 0.34em 0 0.5em;
  text-wrap: balance;
}

.page-about .about-hero .lede {
  max-width: 34em;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  line-height: 1.85;
  color: var(--fg);
}

.page-about .about-hero__panel {
  padding: clamp(18px, 2.4vw, 26px);
  border-top: 2px solid var(--cyan);
  min-width: 0;
}

.page-about .about-hero__panel-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}

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

.page-about .about-status li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line-soft);
  font-size: 0.88rem;
}

.page-about .about-status li:first-child {
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-status__k {
  color: var(--muted);
}

.page-about .about-status__v {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.86rem;
  color: var(--fg-strong);
  white-space: nowrap;
}

.page-about .about-status__v--cyan {
  color: var(--cyan);
}

.page-about .about-status__v--amber {
  color: var(--amber);
}

.page-about .about-hero__panel-note {
  margin: 16px 0 0;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-jump {
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-jump__inner {
  display: flex;
  width: max-content;
  padding-inline: var(--pad);
}

.page-about .about-jump a {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 14px 18px;
  border-left: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-jump a:first-child {
  border-left: 0;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--fg-strong);
  background: rgba(53, 224, 240, 0.09);
}

.page-about .about-jump__n {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--amber);
}

/* ---------- 档案册式条目 ---------- */
.page-about .about-body {
  padding-block: clamp(8px, 2vw, 24px) clamp(32px, 5vw, 64px);
}

.page-about .about-entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 36px);
  padding-block: clamp(34px, 5vw, 62px);
  border-top: 1px solid var(--line);
  min-width: 0;
}

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

.page-about .about-entry__aside {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .about-entry__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.7rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange);
  margin: 0;
}

.page-about .about-entry__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--fg-strong);
}

.page-about .about-entry__note {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
}

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

.page-about .about-entry__body .serif-title,
.page-about .about-wide .serif-title,
.page-about .about-cta .serif-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.35rem, 2.9vw, 1.95rem);
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--fg-strong);
  margin: 0 0 0.7em;
}

.page-about .about-entry__body p,
.page-about .about-wide p {
  max-width: 40em;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--fg);
  margin: 0 0 1em;
}

/* ---------- 色标列表 ---------- */
.page-about .about-swatch {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
}

.page-about .about-swatch__item {
  font-size: 0.78rem;
  color: var(--muted);
  padding-left: 12px;
  border-left: 3px solid var(--tier-main);
}

.page-about .about-swatch__item--main {
  border-left-color: var(--tier-main);
  color: var(--cyan);
}

.page-about .about-swatch__item--compat {
  border-left-color: var(--tier-compat);
  color: var(--amber);
}

.page-about .about-swatch__item--maint {
  border-left-color: var(--tier-maint);
}

.page-about .about-swatch__item--archive {
  border-left-color: var(--tier-archive);
}

/* ---------- 四级版本卡 ---------- */
.page-about .about-tiers {
  display: grid;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-tier {
  display: grid;
  grid-template-columns: 6px minmax(0, 1fr);
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: border-color 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .about-tier--main {
  --tier: var(--tier-main);
  --tier-soft: rgba(53, 224, 240, 0.1);
}

.page-about .about-tier--compat {
  --tier: var(--tier-compat);
  --tier-soft: rgba(240, 179, 90, 0.11);
}

.page-about .about-tier--maint {
  --tier: var(--tier-maint);
  --tier-soft: rgba(14, 124, 140, 0.16);
}

.page-about .about-tier--archive {
  --tier: var(--tier-archive);
  --tier-soft: rgba(125, 147, 166, 0.12);
}

.page-about .about-tier__bar {
  display: block;
  background: var(--tier);
  transition: box-shadow 0.28s var(--ease);
}

.page-about .about-tier__body {
  padding: clamp(16px, 2.2vw, 22px);
  min-width: 0;
}

.page-about .about-tier__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 8px;
}

.page-about .about-tier__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.32rem;
  line-height: 1.2;
  color: var(--fg-strong);
  margin: 0;
}

.page-about .about-tier__ver {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--tier);
  letter-spacing: 0.04em;
}

.page-about .about-tier__desc {
  margin: 0 0 8px;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--fg);
  max-width: 44em;
}

.page-about .about-tier__fit {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-tier__fit span {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 8px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--tier);
}

.page-about .about-tier:hover,
.page-about .about-tier:focus-within {
  border-color: var(--tier);
  background: linear-gradient(90deg, var(--tier-soft) 0%, var(--ink-2) 62%);
}

.page-about .about-tier:hover .about-tier__bar,
.page-about .about-tier:focus-within .about-tier__bar {
  box-shadow: 0 0 18px var(--tier);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .figure__cap {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* ---------- 团队四象限 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-team__cell {
  background: var(--ink-2);
  padding: clamp(18px, 2.6vw, 28px);
  min-width: 0;
}

.page-about .about-team__cell--edit { --role: var(--cyan); }
.page-about .about-team__cell--test { --role: var(--amber); }
.page-about .about-team__cell--path { --role: var(--orange); }
.page-about .about-team__cell--review { --role: var(--cyan-deep); }

.page-about .about-team__role {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.26rem;
  color: var(--fg-strong);
  margin: 0 0 10px;
}

.page-about .about-team__role::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  background: var(--role, var(--cyan));
}

.page-about .about-team__cell p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--fg);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .about-cadence::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--amber), var(--line));
}

.page-about .about-cadence li {
  position: relative;
  padding-bottom: clamp(18px, 2.4vw, 24px);
}

.page-about .about-cadence li:last-child {
  padding-bottom: 0;
}

.page-about .about-cadence li::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 10px;
  height: 10px;
  background: var(--ink);
  border: 1px solid var(--amber);
  transform: rotate(45deg);
}

.page-about .about-cadence__when {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-cadence__what {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--fg-strong);
  margin: 0 0 6px;
}

.page-about .about-cadence li p:last-child {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--fg);
  max-width: 40em;
}

/* ---------- 三审折叠 ---------- */
.page-about .about-steps {
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .about-steps__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-step {
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .about-step + .about-step {
  margin-top: -1px;
}

.page-about .about-step summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--fg-strong);
  transition: background 0.25s var(--ease);
}

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

.page-about .about-step summary:hover {
  background: rgba(53, 224, 240, 0.07);
}

.page-about .about-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--cyan);
}

.page-about .about-step[open] summary::after {
  content: "–";
  color: var(--amber);
}

.page-about .about-step__n {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--orange);
  letter-spacing: 0.08em;
}

.page-about .about-step p {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 0.87rem;
  line-height: 1.8;
  color: var(--fg);
  max-width: 44em;
}

/* ---------- 全景宽幅章节 ---------- */
.page-about .about-entry--wide {
  display: block;
}

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

.page-about .about-wide__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-wide__num {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.7rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-wide__lede {
  max-width: 46em;
}

.page-about .about-wide__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-nets {
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: clamp(18px, 2.4vw, 26px);
  border-top: 2px solid var(--amber);
}

.page-about .about-nets__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-nets__list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-nets__list li {
  padding: 6px 12px;
  border: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--fg);
  background: rgba(11, 27, 43, 0.6);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-nets__list li:hover {
  border-color: var(--amber);
  color: var(--amber);
}

.page-about .about-nets__note {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-devices {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-device {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--dev, var(--cyan));
  padding: clamp(16px, 2.2vw, 22px);
}

.page-about .about-device--desktop { --dev: var(--cyan); }
.page-about .about-device--mobile { --dev: var(--orange); }
.page-about .about-device--tablet { --dev: var(--amber); }

.page-about .about-device h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.16rem;
  color: var(--fg-strong);
}

.page-about .about-device p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.78;
  color: var(--fg);
}

.page-about .about-wide__foot {
  margin-top: clamp(18px, 3vw, 26px);
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--muted);
  max-width: 48em;
}

.page-about .about-wide__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 240, 0.45);
  transition: color 0.25s var(--ease);
}

.page-about .about-wide__foot a:hover {
  color: var(--amber);
  border-bottom-color: rgba(240, 179, 90, 0.6);
}

/* ---------- 运营数字 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 clamp(20px, 3vw, 28px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats li {
  background: var(--ink-2);
  padding: clamp(14px, 2vw, 20px);
  min-width: 0;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.8rem, 4.2vw, 2.6rem);
  line-height: 1.05;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-about .about-stats li:nth-child(3n + 2) .about-stats__num {
  color: var(--amber);
}

.page-about .about-stats li:nth-child(3n) .about-stats__num {
  color: var(--fg-strong);
}

.page-about .about-stats__k {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(53, 224, 240, 0.1) 0%, rgba(240, 179, 90, 0.1) 100%),
    var(--ink-2);
  padding-block: clamp(36px, 5vw, 64px);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: end;
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 44em;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--fg);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面排布 ---------- */
@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about {
    --about-aside: 200px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-entry {
    grid-template-columns: var(--about-aside) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-entry__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .page-about .about-wide__cols {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.4fr);
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr);
    justify-items: end;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-about {
    --about-aside: 240px;
  }
}
<<<END>>>