.page-about {
  --about-cut: 4px 18px 4px 18px;
  --about-cut-sm: 3px 12px 3px 12px;
  background:
    radial-gradient(120% 70% at 88% -8%, rgba(0, 229, 195, 0.08), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-3) 100%);
  color: var(--text);
  overflow-x: clip;
  padding-bottom: clamp(2rem, 6vw, 4rem);
}

.page-about .about-hero {
  padding: clamp(1.5rem, 4.5vw, 3rem) 0 clamp(2.25rem, 6vw, 4rem);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-hero__lead h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.95rem, 7vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-hero__em {
  color: var(--gold);
  background: linear-gradient(180deg, transparent 64%, rgba(212, 175, 55, 0.26) 64%);
  padding: 0 0.08em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 42ch;
  font-size: clamp(0.95rem, 2.6vw, 1.05rem);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__actions {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .about-hero__panel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.page-about .about-hero__visual {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 6px 26px 6px 26px;
  overflow: hidden;
  background: var(--ink-2);
  box-shadow: var(--shadow-deep);
}

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

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.page-about .about-hero__stats li {
  padding: 0.7rem 0.6rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--about-cut-sm);
  background: linear-gradient(160deg, rgba(212, 175, 55, 0.1), rgba(8, 25, 22, 0.2));
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 4.4vw, 1.55rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
  word-break: keep-all;
}

.page-about .about-hero__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.72rem;
  line-height: 1.4;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.page-about .about-section {
  position: relative;
  padding: clamp(2.25rem, 6vw, 4rem) 0;
  border-top: 1px solid rgba(42, 74, 68, 0.6);
}

.page-about .about-section h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.6vw, 2.3rem);
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-section .prose p {
  margin: 0 0 0.9rem;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--muted);
}

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

/* —— 起源 —— */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4.5vw, 2.75rem);
  align-items: start;
}

.page-about .about-origin__visual .figure__frame {
  border-radius: 26px 6px 26px 6px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-origin__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

.page-about .about-origin__visual .figure__caption {
  margin-top: 0.65rem;
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-quote {
  margin: 1.4rem 0 0;
  padding: 1.05rem 1.2rem;
  background: var(--ink-2);
  border-left: 2px solid var(--gold);
  border-radius: 0 14px 14px 0;
  font-family: var(--font-display);
  font-size: clamp(0.98rem, 2.8vw, 1.12rem);
  line-height: 1.8;
  color: var(--gold-soft);
}

/* —— 版本演进 —— */
.page-about .about-versions {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
}

.page-about .about-version {
  position: relative;
  padding: 1.35rem 1.15rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--about-cut);
  background: linear-gradient(165deg, rgba(15, 43, 39, 0.95), rgba(8, 25, 22, 0.95));
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .about-version::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 40%;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(0, 229, 195, 0));
  border-radius: var(--about-cut);
}

.page-about .about-version:hover,
.page-about .about-version:focus-within {
  transform: translateY(-4px);
  border-color: rgba(212, 175, 55, 0.55);
  box-shadow: 0 24px 48px -34px #000;
}

.page-about .about-version__tag {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.16rem 0.6rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--cyan);
  border-radius: 999px;
}

.page-about .about-version__name {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  line-height: 1.45;
  color: var(--text);
}

.page-about .about-version p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

/* —— V3 主张 —— */
.page-about .about-v3__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .about-v3__frame {
  border: 1px solid var(--line);
  border-radius: var(--about-cut);
  overflow: hidden;
  background: var(--ink-2);
  box-shadow: var(--shadow-deep);
}

.page-about .about-v3__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-v3__figure .figure__caption {
  margin-top: 0.65rem;
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-v3__rules {
  display: grid;
  gap: 0.85rem;
}

.page-about .about-v3__rules .panel {
  border: 1px solid var(--line);
  border-radius: var(--about-cut-sm);
  background: rgba(15, 43, 39, 0.72);
  padding: 1.1rem 1.15rem;
  backdrop-filter: blur(6px);
}

.page-about .about-v3__rules .panel__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--gold-soft);
}

.page-about .about-v3__rules .panel__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

/* —— 团队 —— */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4.5vw, 2.75rem);
  align-items: start;
}

.page-about .about-team__links {
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .about-team__visual .figure__frame {
  border: 1px solid var(--line);
  border-radius: 4px 22px 4px 22px;
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-team__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-team__numbers {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-team__numbers li {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--about-cut-sm);
  background: linear-gradient(120deg, rgba(0, 229, 195, 0.08), rgba(8, 25, 22, 0));
}

.page-about .about-team__num {
  flex: 0 0 auto;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 6vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-team__unit {
  font-size: 0.55em;
  margin-left: 0.08em;
  color: var(--gold-soft);
}

.page-about .about-team__label {
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--muted);
}

/* —— 覆盖地区 —— */
.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

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

.page-about .about-coverage__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 0.95rem 0.85rem 0.95rem 1.15rem;
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: background-color 0.22s var(--ease);
}

.page-about .about-coverage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-coverage__list li:hover {
  background: rgba(0, 229, 195, 0.06);
}

.page-about .about-coverage__region {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--gold-soft);
}

.page-about .about-coverage__note {
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--muted);
}

/* —— 里程碑时间线 —— */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0 0 0 1.9rem;
  display: grid;
  gap: 1.5rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(0, 229, 195, 0.55) 55%, rgba(255, 138, 61, 0.5) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 1rem 1.05rem 1.1rem;
  border: 1px solid transparent;
  border-radius: var(--about-cut-sm);
  outline: none;
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -1.9rem;
  top: 1.35rem;
  width: 11px;
  height: 11px;
  margin-left: -0.6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 195, 0.16);
  transition: box-shadow 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-visible {
  border-color: rgba(212, 175, 55, 0.45);
  background: rgba(15, 43, 39, 0.7);
  transform: translateX(3px);
}

.page-about .about-timeline__item:hover .about-timeline__dot,
.page-about .about-timeline__item:focus-visible .about-timeline__dot {
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.22);
}

.page-about .about-timeline__when {
  margin: 0 0 0.35rem;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-timeline__what {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.06rem;
  line-height: 1.5;
  color: var(--text);
}

.page-about .about-timeline__detail {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-milestones__next {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding: 1.2rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--about-cut);
  background: linear-gradient(110deg, rgba(212, 175, 55, 0.1), rgba(8, 25, 22, 0.3));
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.page-about .about-milestones__next p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-milestones__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* —— 断点 —— */
@media (min-width: 700px) {
  .page-about .about-coverage__list li {
    grid-template-columns: minmax(0, 0.55fr) minmax(0, 1fr);
    align-items: baseline;
    gap: 1.2rem;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: center;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.25fr);
    gap: clamp(2rem, 5vw, 3.25rem);
  }

  .page-about .about-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }

  .page-about .about-v3__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(1.75rem, 4vw, 2.75rem);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(2rem, 5vw, 3rem);
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(2rem, 5vw, 3.25rem);
  }

  .page-about .about-milestones__next {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-timeline {
    padding-left: 0;
    margin-left: 0;
  }

  .page-about .about-timeline::before {
    left: 7.6rem;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 7rem minmax(0, 1fr);
    column-gap: 2rem;
    padding: 1.1rem 0 1.2rem;
    align-items: baseline;
  }

  .page-about .about-timeline__dot {
    left: 7.6rem;
    top: 1.55rem;
    margin-left: -5px;
  }

  .page-about .about-timeline__item:hover,
  .page-about .about-timeline__item:focus-visible {
    transform: translateY(-2px);
  }

  .page-about .about-timeline__when {
    grid-column: 1;
    text-align: right;
    margin: 0;
    padding-top: 0.15rem;
  }

  .page-about .about-timeline__what,
  .page-about .about-timeline__detail {
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version,
  .page-about .about-timeline__item,
  .page-about .about-timeline__dot,
  .page-about .about-coverage__list li {
    transition: none;
  }
}