/* ===== 品牌概况页专属样式 ===== */
.page-about {
  font-family: var(--font-body);
  background: var(--warm-white);
  color: var(--graphite);
  overflow-x: hidden;
}

.page-about-container {
  width: min(var(--content-max), 100%);
  margin-inline: auto;
  padding-inline: var(--shell-gutter);
}

/* ===== Hero 区域 ===== */
.page-about-hero {
  background-color: var(--navy);
  background-image:
    linear-gradient(rgba(245, 246, 250, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 246, 250, 0.045) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--warm-white);
  border-bottom: 3px solid var(--red);
  position: relative;
  padding: 30px 0 44px;
}

.page-about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 12%;
  width: 160px;
  height: 8px;
  background: var(--red);
  transform: skewX(-28deg);
  z-index: 1;
}

.page-about-hero::after {
  content: "";
  position: absolute;
  bottom: -1px;
  right: 0;
  width: min(220px, 30%);
  height: 5px;
  background: var(--gold);
}

.page-about-hero__layout {
  display: grid;
  gap: 36px;
  padding-top: 8px;
}

.page-about-hero__main .badge {
  background: var(--red);
  color: var(--warm-white);
  border: 1px solid var(--red-dark);
}

.page-about-hero__main h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(28px, 7vw, 46px);
  line-height: 1.16;
  color: var(--warm-white);
  margin: 16px 0 18px;
  letter-spacing: -0.02em;
  max-width: 14em;
}

.page-about-hero__main > p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 246, 250, 0.82);
  max-width: 48em;
  margin-bottom: 26px;
}

.page-about-hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: var(--warm-white);
  text-decoration: none;
  border: 1px solid var(--border-navy);
  padding: 11px 18px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-about-hero__cta span {
  color: var(--gold);
  font-size: 18px;
  line-height: 1;
}

.page-about-hero__aside {
  border-top: 1px solid var(--border-navy);
  padding-top: 24px;
}

.page-about-hero__chapter-label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}

.page-about-hero__chapter-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about-hero__chapter-list li {
  border-bottom: 1px solid rgba(245, 246, 250, 0.1);
}

.page-about-hero__chapter-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 4px;
  color: rgba(245, 246, 250, 0.84);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.page-about-hero__chapter-list a span {
  font-weight: 900;
  color: var(--red);
  font-size: 12px;
}

.page-about-hero__note {
  margin: 16px 4px 0;
  font-size: 13px;
  color: rgba(245, 246, 250, 0.56);
  line-height: 1.55;
}

/* ===== 主体双栏布局 ===== */
.page-about-layout {
  display: grid;
  gap: 44px;
  padding-block: 44px 80px;
}

/* ===== 左侧索引栏 ===== */
.page-about-index {
  background: var(--navy);
  color: var(--warm-white);
  border: 1px solid var(--navy-deep);
  padding: 24px;
  box-shadow: var(--shadow-panel);
  display: grid;
  gap: 28px;
  align-content: start;
}

.page-about-index__block .page-kicker {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}

.page-about-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about-toc a {
  display: block;
  padding: 9px 4px;
  color: rgba(245, 246, 250, 0.84);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 14px;
  border-bottom: 1px solid rgba(245, 246, 250, 0.12);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.page-about-toc a:hover {
  color: var(--gold);
  padding-left: 10px;
}

.page-about-mini-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: mini;
}

.page-about-mini-timeline li {
  counter-increment: mini;
  position: relative;
  padding: 9px 0 9px 30px;
  font-family: var(--font-heading);
  font-size: 13px;
  color: rgba(245, 246, 250, 0.84);
  border-bottom: 1px solid rgba(245, 246, 250, 0.1);
}

.page-about-mini-timeline li::before {
  content: counter(mini, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 8px;
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  font-size: 10px;
  font-weight: 900;
  color: var(--navy);
  background: var(--gold);
}

.page-about-stats {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about-stats__item {
  border-left: 3px solid var(--gold);
  padding-left: 12px;
}

.page-about-stats__item dt {
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 500;
  color: rgba(245, 246, 250, 0.62);
}

.page-about-stats__item dd {
  margin: 4px 0 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 19px;
  color: var(--warm-white);
}

.page-about-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--sky);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 14px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about-links a:hover {
  color: var(--gold);
  border-color: rgba(245, 166, 35, 0.4);
}

/* ===== 右侧内容章节 ===== */
.page-about-section {
  padding-block: 48px;
  scroll-margin-top: 24px;
}

.page-about-section + .page-about-section {
  border-top: 1px solid var(--border-light);
}

.page-about-section[data-section-theme="teal"] {
  background: var(--teal);
  border-block: 2px solid var(--gold);
}

.page-about-section[data-section-theme="wine"] {
  background: var(--wine);
  border-block: 2px solid var(--gold);
}

.page-about-section__head {
  margin-bottom: 36px;
  display: grid;
  gap: 10px;
}

.page-about-section__num {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--red);
}

.page-about-section[data-section-theme] .page-about-section__num {
  color: var(--gold);
}

.page-about-section__head h2 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(24px, 4vw, 34px);
  color: var(--navy);
  line-height: 1.2;
  margin: 4px 0 0;
}

.page-about-section[data-section-theme] .page-about-section__head h2 {
  color: var(--warm-white);
}

.page-about-section__head p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--graphite);
  max-width: 38em;
}

.page-about-section[data-section-theme] .page-about-section__head p {
  color: rgba(245, 246, 250, 0.78);
}

/* ===== 发展历程时间线 ===== */
.page-about-milestone-grid {
  display: grid;
  gap: 28px;
}

.page-about-milestone__img {
  width: 100%;
  max-width: 260px;
  height: auto;
  object-fit: cover;
  justify-self: center;
  border: 1px solid var(--border-light);
  order: 2;
}

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

.page-about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--red) 0%, var(--red) 58%, var(--gold) 58%, var(--gold) 84%, var(--sky) 84%, var(--sky) 100%);
}

.page-about-timeline__item {
  position: relative;
  padding: 0 0 28px 38px;
}

.page-about-timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 12px;
  width: 12px;
  height: 12px;
  border-radius: 0;
  background: var(--warm-white);
  border: 2px solid var(--red);
  transform: rotate(45deg);
}

.page-about-timeline__tag {
  display: inline-block;
  background: var(--navy);
  color: var(--warm-white);
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 4px 9px;
}

.page-about-timeline__item h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 900;
  margin: 12px 0 8px;
  color: var(--navy);
}

.page-about-timeline__item p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--graphite);
  max-width: 38em;
}

/* ===== 数据能力 ===== */
.page-about-capability__grid {
  display: grid;
  gap: 14px;
  margin-bottom: 32px;
}

.page-about-capability-card {
  background: rgba(245, 246, 250, 0.1);
  border: 1px solid rgba(245, 246, 250, 0.16);
  padding: 20px;
}

.page-about-capability-card strong {
  display: block;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 17px;
  color: var(--warm-white);
  margin-bottom: 8px;
  position: relative;
  padding-left: 14px;
}

.page-about-capability-card strong::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  bottom: 2px;
  width: 4px;
  background: var(--gold);
}

.page-about-capability-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(245, 246, 250, 0.8);
}

.page-about-capability__map {
  margin: 0;
}

.page-about-capability__map img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border-navy);
}

.page-about-capability__map figcaption {
  font-family: var(--font-heading);
  font-size: 12px;
  padding: 12px 0 0;
  color: rgba(245, 246, 250, 0.72);
  letter-spacing: 0.04em;
}

/* ===== 产品与归档 ===== */
.page-about-products {
  display: grid;
  gap: 18px;
}

.page-about-product {
  background: rgba(245, 246, 250, 0.08);
  border: 1px solid rgba(245, 246, 250, 0.14);
  padding: 22px;
  display: grid;
  gap: 12px;
  position: relative;
}

.page-about-product__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about-product h3 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.35;
  color: var(--warm-white);
  margin: 0;
}

.page-about-product p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(245, 246, 250, 0.78);
}

.page-about-product__link {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 166, 35, 0.4);
  padding-bottom: 2px;
  width: fit-content;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about-product__link:hover {
  color: var(--warm-white);
  border-color: var(--warm-white);
}

.page-about-section[data-section-theme] .badge {
  background: rgba(245, 246, 250, 0.18);
  color: var(--warm-white);
  border: 1px solid rgba(245, 246, 250, 0.22);
}

.page-about-section[data-section-theme] .badge--live {
  background: var(--red);
  border-color: var(--red);
}

/* ===== 服务承诺与行业认可 ===== */
.page-about-commitment {
  display: grid;
  gap: 28px;
}

.page-about-commitment__figure {
  margin: 0;
}

.page-about-commitment__figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border-light);
}

.page-about-commitment__figure figcaption {
  font-family: var(--font-heading);
  font-size: 12px;
  color: var(--graphite);
  opacity: 0.72;
  padding-top: 10px;
}

.page-about-commitment__list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: commitment;
}

.page-about-commitment__list li {
  counter-increment: commitment;
  padding-left: 42px;
  position: relative;
  font-size: 14px;
  line-height: 1.65;
  color: var(--graphite);
}

.page-about-commitment__list li::before {
  content: "" counter(commitment, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 12px;
  color: var(--warm-white);
  background: var(--red);
  padding: 3px 6px;
}

.page-about-commitment__list strong {
  font-family: var(--font-heading);
  color: var(--navy);
  font-weight: 900;
}

.page-about-commitment__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 响应式增强 ===== */
@media (min-width: 768px) {
  .page-about-hero {
    padding-block: 40px 56px;
  }

  .page-about-hero__layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.8fr);
    gap: 48px;
    align-items: end;
  }

  .page-about-hero__aside {
    border-top: 0;
    border-left: 1px solid var(--border-navy);
    padding-top: 0;
    padding-left: 32px;
  }

  .page-about-milestone-grid {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: start;
  }

  .page-about-milestone__img {
    order: 1;
    max-width: 100%;
  }

  .page-about-capability__grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about-commitment {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: center;
    gap: 48px;
  }
}

@media (min-width: 1024px) {
  .page-about-hero {
    padding-block: 48px 68px;
  }

  .page-about-hero__layout {
    gap: 64px;
  }

  .page-about-layout {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
    padding-block: 64px 96px;
  }

  .page-about-index {
    position: sticky;
    top: 24px;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
  }

  .page-about-section {
    padding-block: 64px;
  }

  .page-about-products {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}