/* ===== 品牌档案页（.page-about）专属样式 ===== */
.page-about {
  --about-track: rgba(127, 209, 255, 0.2);
  --about-line: rgba(192, 199, 217, 0.14);
  --about-orange-soft: rgba(255, 122, 61, 0.12);
  position: relative;
  background-image:
    radial-gradient(ellipse 90% 55% at 85% -5%, rgba(127, 209, 255, 0.07), transparent 55%),
    radial-gradient(ellipse 60% 40% at 0% 45%, rgba(255, 122, 61, 0.04), transparent 60%);
  padding-bottom: var(--section-pad);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(3.5rem, 7vw, 6.5rem);
  padding-bottom: clamp(2rem, 5vw, 4rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -10%;
  top: -12%;
  width: 58%;
  height: 70%;
  background: radial-gradient(circle at center, rgba(127, 209, 255, 0.12) 0%, transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-silver);
  margin-bottom: 1.5rem;
}

.page-about .breadcrumb a {
  color: var(--color-glacier);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.page-about .about-hero__kicker::before {
  content: "";
  display: inline-block;
  width: 2rem;
  height: 1px;
  background: var(--color-accent);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 5.6vw, 4.5rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--color-text);
  margin: 0 0 1.25rem;
}

.page-about .about-hero__title em {
  font-style: italic;
  color: var(--color-accent);
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: clamp(0.95rem, 1.1vw, 1.08rem);
  line-height: 1.9;
  color: var(--color-silver);
  max-width: 36em;
  margin: 0 0 1.75rem;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--about-line);
  margin-bottom: 1.75rem;
}

.page-about .about-hero__stat-num {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 900;
  font-style: italic;
  line-height: 1.15;
  color: var(--color-accent);
}

.page-about .about-hero__stat-label {
  display: block;
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-silver);
  margin-top: 0.2rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--about-line);
  background: linear-gradient(135deg, rgba(127, 209, 255, 0.08), rgba(5, 8, 20, 0.5));
  overflow: hidden;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-hero__figure figcaption {
  font-family: var(--font-body);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--color-silver);
  padding: 0.65rem 0.9rem;
  border-top: 1px solid var(--about-line);
  background: rgba(11, 16, 38, 0.66);
}

/* ---------- 品牌故事 ---------- */
.page-about .about-story {
  position: relative;
}

.page-about .about-story__heading,
.page-about .about-milestones__heading,
.page-about .about-dataflow__heading,
.page-about .about-contact__heading {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3vw, 2.5rem);
  font-weight: 900;
  line-height: 1.3;
  color: var(--color-text);
  margin: 0;
}

.page-about .about-story__index,
.page-about .about-milestones__index,
.page-about .about-dataflow__index,
.page-about .about-contact__index {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  border: 1px solid rgba(255, 122, 61, 0.5);
  padding: 0.2rem 0.5rem;
}

.page-about .about-story__lead,
.page-about .about-milestones__lead,
.page-about .about-dataflow__lead,
.page-about .about-contact__lead {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-silver);
  max-width: 34em;
  margin: 0.6rem 0 2.75rem;
}

.page-about .about-story__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
}

.page-about .about-story__body p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--color-silver);
  margin: 0 0 1.25rem;
}

.page-about .about-story__body strong {
  color: var(--color-text);
  font-weight: 600;
}

.page-about .about-story__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.9rem;
}

.page-about .about-story__stat {
  background: linear-gradient(165deg, rgba(19, 27, 60, 0.8), rgba(11, 16, 38, 0.88));
  border: 1px solid var(--about-line);
  padding: 1.6rem 1rem;
  text-align: center;
}

.page-about .about-story__stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  font-weight: 900;
  font-style: italic;
  line-height: 1.2;
  color: var(--color-accent);
}

.page-about .about-story__stat-label {
  display: block;
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--color-silver);
  margin-top: 0.45rem;
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-milestones {
  position: relative;
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  left: 6%;
  top: 4%;
  width: 30%;
  height: 40%;
  background: radial-gradient(ellipse at center, rgba(127, 209, 255, 0.05), transparent 65%);
  pointer-events: none;
}

.page-about .about-milestones__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
}

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

.page-about .about-milestones__timeline::before {
  content: "";
  position: absolute;
  left: 0.3125rem;
  top: 0.75rem;
  bottom: 0.75rem;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-accent), var(--about-track), transparent);
}

.page-about .about-milestones__item {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 1.1rem;
}

.page-about .about-milestones__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1rem;
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 122, 61, 0.18), 0 0 14px rgba(255, 122, 61, 0.5);
}

.page-about .about-milestones__item details {
  background: linear-gradient(165deg, rgba(19, 27, 60, 0.66), rgba(11, 16, 38, 0.78));
  border: 1px solid var(--about-line);
}

.page-about .about-milestones__item summary {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  cursor: pointer;
  padding: 1.25rem 1.4rem;
  list-style: none;
  transition: background 0.25s ease;
}

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

.page-about .about-milestones__item summary:hover {
  background: var(--about-orange-soft);
}

.page-about .about-milestones__year {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 900;
  font-style: italic;
  color: var(--color-accent);
  min-width: 5.2rem;
}

.page-about .about-milestones__event {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.page-about .about-milestones__toggle {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--color-accent);
  line-height: 1;
  transition: transform 0.25s ease;
}

.page-about .about-milestones__item details[open] summary .about-milestones__toggle {
  transform: rotate(45deg);
}

.page-about .about-milestones__detail {
  padding: 0.25rem 1.4rem 1.3rem;
  border-top: 1px dashed var(--about-line);
  margin-top: 0.35rem;
}

.page-about .about-milestones__detail p {
  font-family: var(--font-body);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--color-silver);
  margin: 0.75rem 0 0;
}

.page-about .about-milestones__figure {
  margin: 0;
  border: 1px solid var(--about-line);
  background: linear-gradient(135deg, rgba(127, 209, 255, 0.05), rgba(5, 8, 20, 0.55));
  overflow: hidden;
  position: relative;
}

.page-about .about-milestones__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-milestones__figure figcaption {
  font-family: var(--font-body);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--color-silver);
  padding: 0.65rem 0.9rem;
  border-top: 1px solid var(--about-line);
  background: rgba(11, 16, 38, 0.66);
}

/* ---------- 数据如何被处理 ---------- */
.page-about .about-dataflow__steps {
  list-style: none;
  margin: 0 0 2.5rem;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .about-dataflow__step {
  position: relative;
  background: linear-gradient(165deg, rgba(19, 27, 60, 0.72), rgba(11, 16, 38, 0.88));
  border: 1px solid var(--about-line);
  padding: 1.75rem 1.75rem 1.9rem;
}

.page-about .about-dataflow__step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.3rem;
  height: 2.3rem;
  border: 1px solid rgba(255, 122, 61, 0.55);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.page-about .about-dataflow__step h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--color-text);
  margin: 0 0 0.6rem;
}

.page-about .about-dataflow__step p {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--color-silver);
  margin: 0;
}

.page-about .about-dataflow__figure {
  margin: 0;
  border: 1px solid var(--about-line);
  background: linear-gradient(135deg, rgba(127, 209, 255, 0.06), rgba(19, 27, 60, 0.42));
  overflow: hidden;
}

.page-about .about-dataflow__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-dataflow__figure figcaption {
  font-family: var(--font-body);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--color-silver);
  padding: 0.65rem 0.9rem;
  border-top: 1px solid var(--about-line);
  background: rgba(11, 16, 38, 0.66);
}

/* ---------- 运营与联系方式 ---------- */
.page-about .about-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  align-items: start;
}

.page-about .about-contact__body p {
  font-family: var(--font-body);
  line-height: 1.85;
  color: var(--color-silver);
  margin: 0 0 1.25rem;
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.75rem;
}

.page-about .about-contact__card {
  background: linear-gradient(165deg, rgba(255, 122, 61, 0.06), rgba(19, 27, 60, 0.85));
  border: 1px solid var(--about-line);
  padding: 2rem 1.85rem 1.7rem;
}

.page-about .about-contact__card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--color-text);
  margin: 0 0 1.1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 0.35rem 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px dashed rgba(192, 199, 217, 0.12);
}

.page-about .about-contact__row dt {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--color-glacier);
  padding-top: 0.1rem;
}

.page-about .about-contact__row dd {
  font-family: var(--font-body);
  font-size: 0.93rem;
  line-height: 1.6;
  color: var(--color-text);
  margin: 0;
}

.page-about .about-contact__note {
  font-family: var(--font-body);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--color-silver);
  border-top: 1px dashed var(--about-line);
  padding-top: 1rem;
  margin: 1.2rem 0 1rem;
}

.page-about .about-contact__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--color-silver);
  border-top: 1px solid var(--about-line);
  padding-top: 0.85rem;
  margin-top: 0.4rem;
}

/* ---------- 桌面适配 ---------- */
@media (min-width: 760px) {
  .page-about .about-story__grid {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .page-about .about-milestones__layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
  }

  .page-about .about-dataflow__steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-dataflow__figure {
    max-width: 78%;
    margin-left: auto;
    margin-right: auto;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 4rem;
  }

  .page-about .about-contact__grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 3.5rem;
  }
}