.page-about {
  position: relative;
  background-image: radial-gradient(ellipse at 24% -10%, rgba(0, 200, 255, 0.08), transparent 43%), var(--color-bg);
}

.page-about::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-green), var(--color-cyan), var(--color-orange));
  z-index: 2;
}

.page-about .about-container {
  padding-top: 24px;
}

/* ======== 首屏品牌理念 ======== */
.page-about .story-hero { padding-top: 8px; }

.page-about .story-hero__banner {
  position: relative;
  padding: 36px 24px 40px;
  background: linear-gradient(135deg, #0F151B 0%, #16202A 58%, #0B0E12 100%);
  border-color: var(--color-line);
  overflow: hidden;
}

.page-about .story-hero__banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, transparent 72%, rgba(0, 229, 155, 0.08) 84%, transparent 90%),
    repeating-linear-gradient(120deg, transparent 0 18px, rgba(42, 50, 58, 0.14) 18px 19px);
  pointer-events: none;
}

.page-about .story-hero__stamp {
  display: block;
  margin-bottom: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--color-cyan);
}

.page-about .story-hero__intro {
  margin-top: 18px;
  max-width: 660px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-silver);
}

.page-about .story-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  position: relative;
  z-index: 1;
}

.page-about .story-hero__vnote {
  position: absolute;
  top: 24px;
  right: 18px;
  bottom: 24px;
  writing-mode: vertical-rl;
  letter-spacing: 0.36em;
  color: var(--color-muted);
  cursor: help;
  z-index: 1;
}

/* ======== 版本演进时间线 ======== */
.page-about .timeline-section {
  padding-top: 60px;
  padding-bottom: 44px;
  position: relative;
}

.page-about .timeline-section__decor {
  position: absolute;
  top: 4px;
  left: 0;
  width: 100%;
  height: 180px;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .timeline-section__head,
.page-about .android-section__head,
.page-about .team-section__head {
  align-items: flex-end;
  margin-bottom: 22px;
}

.page-about .section-head__text {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .timeline-hero {
  aspect-ratio: 3 / 1;
  margin-bottom: 40px;
  border: 1px solid var(--color-line);
  position: relative;
  clip-path: var(--cut-small);
}

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

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 10px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(0, 229, 155, 0.35), rgba(42, 50, 58, 0.3) 22%, rgba(42, 50, 58, 0.3) 78%, rgba(0, 200, 255, 0.35));
}

.page-about .timeline-item {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 14px;
  position: relative;
  margin-bottom: 28px;
}

.page-about .timeline-marker {
  grid-column: 1;
  grid-row: 1 / span 2;
  justify-self: center;
  align-self: start;
  margin-top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 0 4px rgba(0, 229, 155, 0.12), 0 0 12px rgba(0, 229, 155, 0.4);
  transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}

.page-about .timeline-version {
  grid-column: 2;
  grid-row: 1;
}

.page-about .timeline-version__num {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 38px;
  line-height: 1.05;
  color: var(--color-silver);
  letter-spacing: 0.02em;
  transition: color 0.3s var(--ease-out), text-shadow 0.3s var(--ease-out);
}

.page-about .timeline-version__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--color-muted);
  margin-top: 4px;
}

.page-about .timeline-card {
  grid-column: 2;
  grid-row: 2;
  border-color: var(--color-line);
  transition: transform 0.35s var(--ease-out), border-color 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}

.page-about .timeline-card__summary {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 16px 16px 12px;
  cursor: pointer;
  list-style: none;
}

.page-about .timeline-card__summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-card__title {
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.page-about .timeline-card__hint {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-muted);
  white-space: nowrap;
}

.page-about .timeline-card__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--color-green);
  flex-shrink: 0;
}

.page-about .timeline-card[open] .timeline-card__summary::after {
  content: "−";
}

.page-about .timeline-card__body {
  padding: 4px 16px 16px;
  border-top: 1px dashed var(--color-line);
  margin-top: 2px;
}

.page-about .timeline-card__body p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-muted);
}

/* ======== 安卓阵容适配初心 ======== */
.page-about .android-section {
  padding-top: 56px;
  padding-bottom: 52px;
}

.page-about .android-section__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .android-section__lead,
.page-about .android-section__desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-silver);
  margin-top: 14px;
}

.page-about .android-section__lead {
  color: var(--color-text);
}

.page-about .android-section__img {
  aspect-ratio: 8 / 5;
  margin-top: 24px;
  border: 1px solid var(--color-line);
}

.page-about .android-section__facts {
  padding: 24px;
  position: relative;
}

.page-about .android-section__facts-title {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--color-text);
  margin: 0 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .android-section__facts-title::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--color-green);
  transform: rotate(45deg);
  flex: 0 0 auto;
}

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

.page-about .fact-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--color-line);
}

.page-about .fact-item dt,
.page-about .fact-item dd {
  margin: 0;
}

.page-about .fact-item dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}

.page-about .fact-item dd {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-cyan);
}

.page-about .android-section__note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .android-section__note a {
  color: var(--color-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ======== 团队与能力 ======== */
.page-about .team-section {
  padding-top: 56px;
  padding-bottom: 48px;
}

.page-about .team-section__visual {
  aspect-ratio: 3 / 2;
  max-width: 840px;
  margin: 0 auto 36px;
  border: 1px solid var(--color-line);
}

.page-about .team-section__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .team-section__lead {
  padding: 26px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-silver);
}

.page-about .team-section__lead p {
  margin: 0 0 14px;
}

.page-about .team-section__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .team-section__creds {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.page-about .team-cred {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: 18px 16px;
  border-color: var(--color-line);
}

.page-about .team-cred__num {
  font-family: var(--font-display);
  font-size: 26px;
  color: var(--color-green);
  line-height: 1.1;
}

.page-about .team-cred__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-muted);
}

.page-about .team-section__fact-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--color-line);
}

.page-about .team-section__fact-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 2px;
  border-bottom: 1px dashed var(--color-line);
  font-size: 14px;
  color: var(--color-muted);
}

.page-about .team-section__fact-list li .mono-text {
  color: var(--color-cyan);
  font-size: 14px;
  flex: 0 0 auto;
}

/* ======== 桌面端 ======== */
@media (min-width: 768px) {
  .page-about .story-hero__banner {
    padding: 56px 72px 56px 56px;
  }

  .page-about .team-section__fact-list {
    grid-template-columns: 1fr 1fr;
    column-gap: 36px;
  }
}

@media (min-width: 900px) {
  .page-about .timeline-section__decor {
    height: 260px;
  }

  .page-about .timeline-list::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .timeline-item {
    grid-template-columns: minmax(0, 1fr) 24px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .timeline-marker {
    grid-column: 2;
    grid-row: 1;
    margin-top: 12px;
  }

  .page-about .timeline-version {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
    justify-self: end;
    align-self: start;
  }

  .page-about .timeline-card {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about .timeline-item:nth-child(even) .timeline-version {
    grid-column: 3;
    text-align: left;
    justify-self: start;
  }

  .page-about .timeline-item:nth-child(even) .timeline-card {
    grid-column: 1;
  }

  .page-about .timeline-item:hover .timeline-version__num {
    color: var(--color-green);
    text-shadow: 0 0 24px rgba(0, 229, 155, 0.3);
  }

  .page-about .timeline-item:hover .timeline-marker {
    transform: scale(1.25);
    box-shadow: 0 0 0 6px rgba(0, 229, 155, 0.14), 0 0 18px rgba(0, 229, 155, 0.6);
  }

  .page-about .timeline-item:hover .timeline-card {
    border-color: rgba(0, 200, 255, 0.55);
    transform: translateY(-2px);
    box-shadow: 0 14px 30px -18px rgba(0, 0, 0, 0.65);
  }

  .page-about .android-section__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .android-section__facts {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .team-section__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: stretch;
  }
}

@media (min-width: 1200px) {
  .page-about .timeline-version__num {
    font-size: 46px;
  }

  .page-about .timeline-card__title {
    font-size: 19px;
  }

  .page-about .android-section__facts {
    padding: 28px;
  }
}