.page-about {
  --ab-space: clamp(64px, 8vw, 112px);
  --ab-plate-h: clamp(200px, 34vw, 380px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4vw, 48px) 0 clamp(44px, 6vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -14% auto -14%;
  height: clamp(360px, 52vw, 620px);
  background:
    radial-gradient(58% 100% at 26% 0%, rgba(47, 243, 200, .16), transparent 68%),
    radial-gradient(48% 92% at 84% 8%, rgba(255, 138, 61, .12), transparent 68%);
  pointer-events: none;
  animation: abDrift 20s var(--ease) infinite alternate;
}

@keyframes abDrift {
  from { transform: translate3d(-1.6%, 0, 0); }
  to   { transform: translate3d(1.6%, 1.2%, 0); }
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(30px, 4.4vw, 56px);
  align-items: end;
}

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

.page-about .about-hero .crumbs { margin-bottom: clamp(20px, 3vw, 34px); }

.page-about .about-hero__eyebrow {
  margin: 0 0 clamp(14px, 2vw, 22px);
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  font-size: clamp(38px, 7vw, 88px);
  font-weight: 250;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(24px, 3vw, 36px);
  max-width: 36em;
  font-size: clamp(16px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__board {
  margin: 0;
  padding: 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-xl);
  background-color: rgba(18, 46, 38, .55);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(30, 64, 56, .55) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(30, 64, 56, .55) 23px 24px);
}

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

.page-about .about-hero__board figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
}

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
  }
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  padding-bottom: clamp(72px, 9vw, 132px);
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: start;
  }
}

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

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--muted);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar { display: none; }

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-size: 14px;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan-soft);
  border-color: var(--cyan-a24);
  background: var(--cyan-a12);
}

.page-about .about-index__n {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--orange);
}

@media (min-width: 1040px) {
  .page-about .about-index {
    position: sticky;
    top: 84px;
  }
  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }
  .page-about .about-index__link {
    border-radius: 0 var(--pill) var(--pill) 0;
    border-left: 2px solid transparent;
    padding: 9px 12px;
  }
  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--cyan);
  }
}

.page-about .about-flow {
  display: grid;
  gap: var(--ab-space);
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .chapter { min-width: 0; }

.page-about .chapter__num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .chapter__title {
  margin: 0 0 clamp(18px, 2.2vw, 26px);
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 250;
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .chapter__lede {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 34em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .chapter__body p {
  max-width: 36em;
  margin: 0 0 18px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .chapter--loose .principles { margin-top: clamp(8px, 2vw, 20px); }

/* ---------- 通栏图 ---------- */
.page-about .about-plate {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-xl);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-plate img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}

.page-about .about-plate figcaption {
  padding: 14px 18px 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: center;
}

.page-about .team__ring-wrap {
  position: relative;
  width: clamp(190px, 42vw, 224px);
  aspect-ratio: 1;
  margin: 0 auto;
}

.page-about .team__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    var(--cyan) 0 43.75%,
    var(--orange) 43.75% 78.125%,
    rgba(143, 168, 160, .5) 78.125% 100%
  );
}

.page-about .team__ring::after {
  content: "";
  position: absolute;
  inset: 26px;
  border: 1px solid var(--line-soft);
  border-radius: 50%;
  background: var(--ink);
}

.page-about .team__ring-center {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 2px;
}

.page-about .team__ring-num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  color: var(--white);
}

.page-about .team__ring-cap {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .team__list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team__item {
  padding: 18px 0 18px 16px;
  border-left: 2px solid var(--line);
}

.page-about .team__item--a { border-left-color: var(--cyan); }
.page-about .team__item--b { border-left-color: var(--orange); }
.page-about .team__item--c { border-left-color: var(--muted); }

.page-about .team__item + .team__item { margin-top: 4px; }

.page-about .team__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin: 0 0 8px;
}

.page-about .team__name {
  font-size: 17px;
  font-weight: 500;
  color: var(--white);
}

.page-about .team__count {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .team__desc {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

@media (min-width: 820px) {
  .page-about .team {
    grid-template-columns: minmax(0, 240px) minmax(0, 1fr);
  }
}

/* ---------- 流程条 ---------- */
.page-about .flow {
  counter-reset: abstep;
  display: grid;
  gap: 0;
  margin: 0 0 clamp(30px, 4vw, 46px);
  padding: 0;
  list-style: none;
}

.page-about .flow__step { position: relative; }

.page-about .flow__details {
  padding: 16px 0 18px;
  border-top: 1px solid var(--line);
}

.page-about .flow__summary {
  display: block;
  cursor: pointer;
  list-style: none;
}

.page-about .flow__summary::-webkit-details-marker { display: none; }
.page-about .flow__summary::marker { content: ""; }

.page-about .flow__summary:focus-visible {
  outline: 2px solid var(--cyan-a24);
  outline-offset: 4px;
  border-radius: var(--r-md);
}

.page-about .flow__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--orange);
}

.page-about .flow__num::before {
  counter-increment: abstep;
  content: counter(abstep, decimal-leading-zero);
}

.page-about .flow__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .flow__name {
  display: block;
  margin-top: 6px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--white);
}

.page-about .flow__details[open] .flow__name { color: var(--cyan-soft); }

.page-about .flow__panel {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
}

.page-about .flow__panel p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

@media (min-width: 780px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    align-items: start;
  }
  .page-about .flow__step::after {
    content: "";
    position: absolute;
    top: 30px;
    right: -8px;
    width: 16px;
    height: 1px;
    background: var(--line);
  }
  .page-about .flow__step:last-child::after { display: none; }
}

/* ---------- 流程脚注 ---------- */
.page-about .day-note {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: center;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-xl);
  background-color: var(--ink-2);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(30, 64, 56, .4) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(30, 64, 56, .4) 23px 24px);
}

.page-about .day-note__media {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .day-note__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .day-note__text p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .day-note__text p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

@media (min-width: 820px) {
  .page-about .day-note {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  }
}

/* ---------- 版本卡 ---------- */
.page-about .stages {
  display: grid;
  gap: 18px;
}

.page-about .stage {
  padding: 26px 22px 28px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-xl);
  background-color: var(--ink-2);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(30, 64, 56, .42) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(30, 64, 56, .42) 23px 24px);
}

.page-about .stage--2 { background-color: #142f28; }
.page-about .stage--3 { background-color: #16332b; }

.page-about .stage__tag {
  display: inline-block;
  padding: 5px 12px;
  border-radius: var(--pill);
  background: var(--orange-a14);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--orange-soft);
}

.page-about .stage__title {
  margin: 16px 0 14px;
  font-size: 21px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--white);
}

.page-about .stage__need {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .stage__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

@media (min-width: 900px) {
  .page-about .stages {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
    padding-bottom: 46px;
  }
  .page-about .stage { padding: 30px 24px 32px; }
  .page-about .stage--2 { margin-top: 32px; }
  .page-about .stage--3 { margin-top: 64px; }
}

/* ---------- 三条做法 ---------- */
.page-about .principles {
  display: grid;
  gap: clamp(26px, 3.6vw, 44px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .principle {
  padding-left: clamp(16px, 2vw, 24px);
  border-left: 2px solid var(--cyan-a24);
  transition: border-color var(--dur) var(--ease);
}

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

.page-about .principle__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2vw, 23px);
  font-weight: 400;
  line-height: 1.45;
  color: var(--white);
}

.page-about .principle__text {
  margin: 0 0 12px;
  max-width: 38em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text);
}

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

/* ---------- 规模 ---------- */
.page-about .scale-plate {
  margin: 0 0 clamp(28px, 4vw, 44px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-xl);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .scale-plate img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .scale-list {
  margin: 0 0 clamp(34px, 4.5vw, 54px);
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .scale-row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .scale-row__label {
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .scale-row__value {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.page-about .scale-row__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .scale-row__unit {
  font-size: 15px;
  color: var(--text);
}

@media (min-width: 760px) {
  .page-about .scale-row {
    grid-template-columns: 180px minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }
  .page-about .scale-row__label { padding-top: 6px; }
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 18px;
  padding: clamp(24px, 3.4vw, 38px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-xl);
  background: linear-gradient(120deg, rgba(47, 243, 200, .1), rgba(255, 138, 61, .1));
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 40em;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-cta__row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before { animation: none; }
  .page-about .about-index__link,
  .page-about .principle { transition: none; }
}
</page_css>