/* ===== 品牌概况页：编辑型长页 ===== */
.page-about {
  background: var(--c-bg);
  color: var(--c-silver);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}
.page-about .breadcrumb {
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--c-teal);
}

/* ===== 首屏：错位色块 + 月相图 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--c-teal);
  background:
    radial-gradient(120% 90% at 85% 8%, rgba(122, 90, 248, 0.18) 0%, transparent 55%),
    linear-gradient(135deg, var(--c-bg) 0%, var(--c-bg-deep) 55%, var(--c-teal) 130%);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(-45deg, transparent 0 14px, rgba(122, 90, 248, 0.07) 14px 16px);
  pointer-events: none;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  position: relative;
  z-index: 1;
  padding: 2.5rem 0 2.75rem;
}
.page-about .about-hero__note {
  margin: 0 0 0.75rem;
  font-family: var(--font-index);
  font-size: var(--fs-small);
  letter-spacing: 0.18em;
  color: var(--c-gold);
  text-transform: uppercase;
}
.page-about .about-hero__title {
  margin: 0 0 1rem;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: var(--fs-title);
  line-height: 1.16;
  color: var(--c-silver);
}
.page-about .about-hero__lead {
  margin: 0 0 1.5rem;
  max-width: 60ch;
  color: var(--c-silver-dim);
  font-size: var(--fs-body);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.page-about .about-hero__fig {
  margin: 0;
  padding: 6px;
  background: linear-gradient(135deg, var(--c-violet), var(--c-teal));
  clip-path: var(--clip-corner);
  transform: rotate(0.6deg);
}
.page-about .about-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--clip-corner);
}

/* ===== 01 方法论：宽窄交替 ===== */
.page-about .section__head {
  margin-bottom: 1.5rem;
}
.page-about .section__head .section__index {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--c-violet-glow);
  margin-bottom: 0.25rem;
}
.page-about .section__head h2 {
  margin: 0.15rem 0 0.45rem;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: var(--fs-subtitle);
  line-height: 1.25;
  color: var(--c-silver);
}
.page-about .section__desc {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--c-silver-dim);
  letter-spacing: 0.05em;
}
.page-about .about-method__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.page-about .about-method__main {
  border-left: 3px solid var(--c-violet);
  padding-left: 1.25rem;
}
.page-about .about-method__main p {
  margin: 0 0 1rem;
  color: var(--c-silver-dim);
}
.page-about .about-method__main p:last-child {
  margin-bottom: 0;
}
.page-about .about-method__aside {
  background: linear-gradient(135deg, var(--c-bg-raised), var(--c-teal));
  border: 1px solid var(--c-violet);
  margin: 0;
}
.page-about .about-method__aside h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.15rem;
  color: var(--c-silver);
}
.page-about .about-method__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.9rem;
}
.page-about .about-method__list li {
  padding-left: 1rem;
  position: relative;
  color: var(--c-silver-dim);
}
.page-about .about-method__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.45rem;
  height: 0.45rem;
  background: var(--c-violet-glow);
  transform: rotate(45deg);
}
.page-about .about-method__list strong {
  color: var(--c-silver);
  font-weight: 600;
}

/* ===== 02 里程碑：横向滚动时间线 ===== */
.page-about .about-timeline {
  border-top: 1px solid var(--c-teal);
  border-bottom: 1px solid var(--c-teal);
  background:
    linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-deep) 100%);
}
.page-about .about-timeline__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: min(85%, 320px);
  gap: 1rem;
  overflow-x: auto;
  padding: 1.5rem 0 1.75rem 0.25rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.page-about .timeline-node {
  scroll-snap-align: start;
  background: var(--c-bg-raised);
  border: 1px solid var(--c-teal);
  border-left: 3px solid var(--c-violet);
  padding: 1.25rem 1.25rem 1.5rem;
}
.page-about .timeline-node__head {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.75rem;
}
.page-about .timeline-node__phase {
  font-family: var(--font-index);
  font-size: var(--fs-small);
  color: var(--c-gold);
  letter-spacing: 0.08em;
}
.page-about .timeline-node h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--c-silver);
}
.page-about .timeline-node p {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--c-silver-dim);
}
.page-about .about-timeline__compare {
  margin-top: 0.5rem;
  padding: 1.5rem 0 2rem;
}
.page-about .about-timeline__compare h3 {
  margin: 0 0 0.85rem;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--c-silver);
}
.page-about .version-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--c-bg-raised);
  font-size: var(--fs-small);
}
.page-about .version-table th,
.page-about .version-table td {
  border: 1px solid var(--c-teal);
  padding: 0.7rem 0.85rem;
  text-align: left;
  vertical-align: top;
}
.page-about .version-table th {
  background: var(--c-teal);
  color: var(--c-silver);
  font-family: var(--font-index);
  font-weight: 600;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.page-about .version-table td {
  color: var(--c-silver-dim);
}

/* ===== 03 团队与组织形态 ===== */
.page-about .about-team__intro {
  max-width: 70ch;
  margin: 0 0 1.5rem;
  color: var(--c-silver-dim);
}
.page-about .about-team__grid {
  gap: 1rem;
}
.page-about .about-role {
  position: relative;
  border-color: var(--c-teal);
  border-top: 2px solid var(--c-violet);
  margin: 0;
  padding: 1.25rem;
}
.page-about .about-role .role-num {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--c-violet-glow);
  margin-bottom: 0.5rem;
}
.page-about .about-role h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.15rem;
  color: var(--c-silver);
}
.page-about .about-role p {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--c-silver-dim);
}

/* ===== 04 合作生态 ===== */
.page-about .about-eco {
  border-top: 1px solid var(--c-teal);
  background:
    repeating-linear-gradient(-45deg, transparent 0 16px, rgba(27, 73, 101, 0.16) 16px 18px),
    var(--c-bg);
}
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}
.page-about .about-eco__content p {
  margin: 0 0 1rem;
  color: var(--c-silver-dim);
}
.page-about .about-eco__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.9rem;
}
.page-about .about-eco__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.6rem;
  color: var(--c-silver-dim);
  font-size: var(--fs-small);
}
.page-about .about-eco__fig {
  margin: 0;
  padding: 6px;
  background: linear-gradient(135deg, var(--c-gold), var(--c-violet));
  clip-path: var(--clip-corner);
  order: -1;
}
.page-about .about-eco__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--clip-corner);
}

/* ===== 05 资质与认证 ===== */
.page-about .about-compliance__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .about-compliance .compliance-item {
  margin: 0;
  border: 1px solid var(--c-paper-deep);
  color: var(--c-ink);
  clip-path: var(--clip-corner);
}
.page-about .compliance-item__code {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--c-red);
  margin-bottom: 0.5rem;
}
.page-about .compliance-item h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--c-ink);
}
.page-about .compliance-item p {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--c-ink-soft);
}

/* ===== 06 数据规模与覆盖 ===== */
.page-about .about-data {
  border-top: 1px solid var(--c-teal);
  background: linear-gradient(180deg, var(--c-bg-deep) 0%, var(--c-bg) 100%);
}
.page-about .about-data__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.page-about .stat-panel {
  padding: 1.25rem 1rem;
  border: 1px solid var(--c-teal);
  border-top: 3px solid var(--c-gold);
  background: var(--c-bg-raised);
}
.page-about .stat-value {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.1;
  color: var(--c-silver);
}
.page-about .stat-value__unit {
  font-size: 0.5em;
  color: var(--c-violet-glow);
  margin-left: 0.2em;
  font-family: var(--font-index);
  letter-spacing: 0.05em;
}
.page-about .stat-label {
  margin-top: 0.35rem;
  font-size: var(--fs-small);
  color: var(--c-silver-dim);
  line-height: 1.5;
}
.page-about .about-data__fig {
  margin: 1.5rem 0 0;
  padding: 6px;
  background: linear-gradient(135deg, var(--c-teal), var(--c-violet));
  clip-path: var(--clip-corner);
}
.page-about .about-data__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--clip-corner);
}
.page-about .about-data__fig figcaption {
  padding: 0.6rem 0.25rem 0.1rem;
  font-size: var(--fs-small);
  color: var(--c-silver-dim);
}

/* ===== 收尾引导 ===== */
.page-about .about-cta__panel {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  padding: 2rem 1.5rem;
  border: 1px solid var(--c-violet);
  background:
    linear-gradient(135deg, rgba(122, 90, 248, 0.14) 0%, transparent 60%),
    var(--c-bg-raised);
  clip-path: var(--clip-corner);
}
.page-about .about-cta__eyebrow {
  margin: 0 0 0.35rem;
  font-family: var(--font-index);
  font-size: var(--fs-small);
  letter-spacing: 0.15em;
  color: var(--c-gold);
}
.page-about .about-cta__panel h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: var(--fs-subtitle);
  line-height: 1.2;
  color: var(--c-silver);
}
.page-about .about-cta__panel p {
  margin: 0;
  color: var(--c-silver-dim);
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
    align-items: center;
    padding: 4.5rem 0;
  }
  .page-about .about-hero__fig {
    transform: rotate(-0.8deg);
  }
  .page-about .about-method__grid {
    grid-template-columns: 1.4fr 1fr;
    gap: 2.5rem;
  }
  .page-about .about-timeline__track {
    grid-auto-columns: calc((100% - 2rem) / 3);
    padding-bottom: 2.25rem;
  }
  .page-about .about-eco__grid {
    grid-template-columns: 1.2fr 1fr;
    gap: 2.5rem;
  }
  .page-about .about-eco__fig {
    order: 1;
  }
  .page-about .about-compliance__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
  .page-about .about-data__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: center;
  }
  .page-about .about-data__stats {
    order: 1;
    gap: 1.25rem;
  }
  .page-about .about-data__fig {
    margin: 0;
  }
  .page-about .about-cta__panel {
    grid-template-columns: 1.3fr 1fr;
    gap: 2rem;
    align-items: center;
    padding: 2.5rem 2.25rem;
  }
}

@media (min-width: 1200px) {
  .page-about .about-timeline__track {
    grid-auto-columns: calc((100% - 3rem) / 4);
  }
}