.page-about {
  --about-shadow: 0 24px 60px rgba(2, 10, 20, .55);
  --about-card: rgba(15, 42, 68, .66);
  display: block;
  color: var(--white);
  background: var(--night);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -18%;
  width: min(74vw, 760px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 42% 42%, rgba(61, 255, 158, .16), rgba(61, 255, 158, 0) 66%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: clamp(1rem, 2.6vw, 1.75rem);
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-size: clamp(1.95rem, 5.6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -.012em;
  margin: .55rem 0 1rem;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  max-width: 38ch;
  font-size: var(--fs-18);
  line-height: 1.75;
  color: rgba(232, 241, 248, .84);
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.4rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-13);
  color: var(--steel);
}

.page-about .about-hero__meta span {
  display: inline-block;
  margin-right: .35rem;
  font-family: var(--font-display);
  font-size: var(--fs-18);
  color: var(--neon);
  letter-spacing: .02em;
}

.page-about .about-hero__art {
  position: relative;
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--night-2);
  box-shadow: var(--about-shadow);
  transform: rotate(-.7deg);
}

.page-about .about-hero__art img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 1.6rem 1.1rem .85rem;
  margin: 0;
  font-size: var(--fs-13);
  color: rgba(232, 241, 248, .9);
  background: linear-gradient(to top, rgba(8, 23, 38, .94), rgba(8, 23, 38, 0));
}

/* ---------- 通用段落节奏 ---------- */
.page-about .section {
  padding: clamp(2.5rem, 6vw, 4.75rem) 0;
  position: relative;
}

.page-about .section__head {
  max-width: 62ch;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .section__index {
  font-family: var(--font-display);
  font-size: var(--fs-40);
  line-height: 1;
  color: rgba(53, 214, 255, .32);
  margin: 0 0 .3rem;
  letter-spacing: .04em;
}

.page-about .section__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.8vw, 2.35rem);
  line-height: 1.18;
  letter-spacing: -.008em;
  margin: 0 0 .7rem;
}

.page-about .section__lead {
  max-width: 38ch;
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(232, 241, 248, .72);
}

/* ---------- 01 问题清单 ---------- */
.page-about .painlist {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .painlist__row {
  display: grid;
  gap: .45rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .painlist__problem {
  margin: 0;
  font-size: var(--fs-18);
  font-weight: 600;
  line-height: 1.5;
  color: rgba(232, 241, 248, .95);
  padding-left: 1.15rem;
  position: relative;
}

.page-about .painlist__problem::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: var(--ember);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, .16);
}

.page-about .painlist__fix {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(232, 241, 248, .74);
  padding-left: 1.15rem;
  border-left: 2px solid rgba(61, 255, 158, .28);
  padding-block: .1rem;
}

/* ---------- 02 时间线 ---------- */
.page-about .chipbar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: .75rem;
}

.page-about .filter-status {
  min-height: 1.25rem;
  margin: 0 0 1.25rem;
  font-size: var(--fs-13);
  color: var(--steel);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 3px;
  top: .6rem;
  bottom: .6rem;
  width: 2px;
  background: linear-gradient(to bottom, rgba(61, 255, 158, .7), rgba(53, 214, 255, .55), rgba(255, 106, 26, .6), rgba(216, 163, 74, .5));
  border-radius: 2px;
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  gap: .65rem;
  padding: 0 0 1.9rem 1.6rem;
}

.page-about .timeline__item:last-child {
  padding-bottom: .4rem;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: .55rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--ember);
}

.page-about .timeline__coord {
  display: flex;
  align-items: baseline;
  gap: .55rem;
}

.page-about .timeline__year {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  line-height: 1;
  color: var(--neon);
  letter-spacing: .01em;
}

.page-about .timeline__season {
  font-size: var(--fs-13);
  color: var(--steel);
  writing-mode: horizontal-tb;
}

.page-about .timeline__body {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  backdrop-filter: blur(2px);
}

.page-about .timeline__body h3 {
  margin: .5rem 0 .45rem;
  font-size: var(--fs-18);
  line-height: 1.45;
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 40ch;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(232, 241, 248, .74);
}

/* ---------- 旧版板块 ---------- */
.page-about .legacy {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.25rem, 3vw, 1.9rem);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 106, 26, .34);
  background: linear-gradient(140deg, rgba(255, 106, 26, .12), rgba(8, 23, 38, .2) 58%);
}

.page-about .legacy__kicker {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-size: var(--fs-13);
  letter-spacing: .22em;
  color: var(--ember);
}

.page-about .legacy__text h3 {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  line-height: 1.25;
}

.page-about .legacy__text p {
  margin: 0;
  max-width: 44ch;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(232, 241, 248, .78);
}

.page-about .legacy__art {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

/* ---------- 03 奶油面板 · 团队 ---------- */
.page-about .about-team {
  background: linear-gradient(to bottom, var(--night) 0%, var(--night) 22%, var(--night-2) 22%, var(--night-2) 78%, var(--night) 78%);
}

.page-about .team-band {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  border-radius: var(--radius);
  background: var(--cream);
  color: var(--ink-brown);
  box-shadow: 0 30px 70px rgba(2, 10, 20, .5);
}

.page-about .team-band__eyebrow {
  margin: 0 0 .5rem;
  font-size: var(--fs-13);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(28, 22, 19, .62);
}

.page-about .team-band__intro h2 {
  margin: 0 0 .75rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.8vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: -.008em;
}

.page-about .team-band__intro p {
  margin: 0;
  max-width: 40ch;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(28, 22, 19, .78);
}

.page-about .team-band__art {
  margin: 1.25rem 0 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid rgba(28, 22, 19, .16);
}

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

.page-about .team-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

.page-about .team-roles__item {
  padding: 1rem 1.05rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .55);
  border: 1px solid rgba(28, 22, 19, .12);
}

.page-about .team-roles__no {
  display: block;
  font-family: var(--font-display);
  font-size: var(--fs-13);
  letter-spacing: .2em;
  color: #B4531A;
  margin-bottom: .25rem;
}

.page-about .team-roles__item h3 {
  margin: 0 0 .35rem;
  font-size: var(--fs-18);
  line-height: 1.4;
}

.page-about .team-roles__item p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: rgba(28, 22, 19, .76);
}

/* ---------- 04 协作网络 ---------- */
.page-about .netstats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .netstat {
  padding: 1.15rem 1rem;
  background: var(--night-2);
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.page-about .netstat__num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 2.9rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: .01em;
}

.page-about .netstat__num small {
  font-size: .5em;
  color: var(--neon);
  margin-left: .1em;
}

.page-about .netstat__label {
  font-size: var(--fs-13);
  color: rgba(232, 241, 248, .7);
  line-height: 1.5;
}

.page-about .network__flow {
  display: grid;
  gap: 1rem;
}

.page-about .network__step {
  position: relative;
  padding: 1.1rem 1.15rem 1.15rem 3.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(15, 42, 68, .5);
}

.page-about .network__step-no {
  position: absolute;
  left: 1rem;
  top: 1.05rem;
  font-family: var(--font-display);
  font-size: var(--fs-28);
  line-height: 1;
  color: rgba(53, 214, 255, .55);
}

.page-about .network__step h3 {
  margin: 0 0 .4rem;
  font-size: var(--fs-18);
  line-height: 1.45;
}

.page-about .network__step p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(232, 241, 248, .74);
}

/* ---------- 05 服务准则 ---------- */
.page-about .about-service {
  background: linear-gradient(to bottom, var(--night) 0%, rgba(15, 42, 68, .55) 100%);
}

.page-about .rulelist {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: rule;
  border-top: 1px solid var(--line-strong);
}

.page-about .rulelist__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .rulelist__idx {
  font-family: var(--font-display);
  font-size: var(--fs-40);
  line-height: .95;
  color: var(--ember);
  opacity: .82;
  min-width: 2.1ch;
}

.page-about .rulelist__body h3 {
  margin: 0 0 .45rem;
  font-size: var(--fs-18);
  line-height: 1.45;
}

.page-about .rulelist__body p {
  margin: 0;
  max-width: 46ch;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(232, 241, 248, .74);
}

/* ---------- 06 三件事 ---------- */
.page-about .principles {
  display: grid;
  gap: 1rem;
}

.page-about .principle {
  position: relative;
  padding: 1.4rem 1.25rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--about-card);
  overflow: hidden;
}

.page-about .principle::after {
  content: "";
  position: absolute;
  inset: auto -30% -55% auto;
  width: 62%;
  aspect-ratio: 1;
  border-radius: 50%;
  opacity: .22;
  pointer-events: none;
}

.page-about .principle--fast::after { background: radial-gradient(circle, var(--neon), transparent 68%); }
.page-about .principle--flow::after { background: radial-gradient(circle, var(--cyan), transparent 68%); }
.page-about .principle--back::after { background: radial-gradient(circle, var(--gold), transparent 68%); }

.page-about .principle__key {
  display: inline-block;
  margin: 0 0 .6rem;
  padding: .2rem .6rem;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: var(--fs-13);
  letter-spacing: .12em;
  color: var(--night);
}

.page-about .principle--fast .principle__key { background: var(--neon); }
.page-about .principle--flow .principle__key { background: var(--cyan); }
.page-about .principle--back .principle__key { background: var(--gold); }

.page-about .principle h3 {
  margin: 0 0 .5rem;
  font-size: var(--fs-18);
  line-height: 1.45;
}

.page-about .principle p {
  margin: 0;
  max-width: 40ch;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(232, 241, 248, .76);
}

/* ---------- 07 下一步 ---------- */
.page-about .about-next {
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.page-about .nextlinks {
  display: grid;
  gap: .85rem;
}

.page-about .nextlink {
  position: relative;
  display: grid;
  gap: .3rem;
  padding: 1.25rem 3.2rem 1.25rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  background: linear-gradient(135deg, rgba(61, 255, 158, .1), rgba(15, 42, 68, .5) 62%);
  color: inherit;
  text-decoration: none;
  transition: transform .28s var(--ease), border-color .28s var(--ease), background .28s var(--ease);
}

.page-about .nextlink--quiet {
  background: rgba(15, 42, 68, .42);
}

.page-about .nextlink:hover,
.page-about .nextlink:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(61, 255, 158, .55);
  background: linear-gradient(135deg, rgba(61, 255, 158, .18), rgba(15, 42, 68, .58) 62%);
}

.page-about .nextlink__kicker {
  font-family: var(--font-display);
  font-size: var(--fs-13);
  letter-spacing: .2em;
  color: var(--neon);
}

.page-about .nextlink__title {
  font-size: var(--fs-18);
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
}

.page-about .nextlink__arrow {
  position: absolute;
  right: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--fs-28);
  line-height: 1;
  color: var(--ember);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .painlist__row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    gap: 0 2rem;
    align-items: start;
    padding: 1.5rem 0;
  }

  .page-about .painlist__problem {
    font-size: var(--fs-18);
    padding-left: 1.3rem;
  }

  .page-about .painlist__fix {
    font-size: var(--fs-15);
    padding-right: .5rem;
  }

  .page-about .timeline__item {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 0 2rem;
    padding: 0 0 2.1rem 2rem;
  }

  .page-about .timeline__coord {
    flex-direction: column;
    align-items: flex-start;
    gap: .25rem;
    padding-top: .1rem;
  }

  .page-about .timeline__season {
    writing-mode: vertical-rl;
    letter-spacing: .2em;
    color: rgba(108, 133, 152, .85);
  }

  .page-about .legacy {
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
    align-items: center;
    gap: 2rem;
  }

  .page-about .team-band {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: 2.25rem;
    align-items: start;
  }

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

  .page-about .netstats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .principle:nth-child(2) {
    transform: translateY(-14px) rotate(.5deg);
  }

  .page-about .principle:nth-child(3) {
    transform: rotate(-.5deg);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: end;
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-hero__art {
    transform: rotate(-1.1deg) translateY(14px);
  }

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

  .page-about .nextlink--quiet {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .nextlink,
  .page-about .about-hero__art,
  .page-about .principle {
    transition: none;
    transform: none;
  }
}