/* ===== 品牌中心 /brand/ 页面专属样式 ===== */

.page-about {
  --about-rail: 4.25rem;
  --about-line: 1px solid var(--line-gold-soft);
  color: var(--c-sand);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: clamp(1.75rem, 4.5vw, 3rem);
  padding: clamp(1.5rem, 4.5vw, 3.25rem) 0 clamp(2.25rem, 5vw, 3.75rem);
  border-bottom: 1px solid var(--line-gold-soft);
}

.page-about .about-hero__lead {
  max-width: 60ch;
}

.page-about .about-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 6.4vw, 3.5rem);
  line-height: 1.22;
  letter-spacing: -0.012em;
  font-weight: 800;
  margin: 0.6rem 0 1.1rem;
  color: var(--c-sand);
  text-wrap: balance;
}

.page-about .about-hero .lead {
  font-size: clamp(0.95rem, 1.9vw, 1.1rem);
  line-height: 1.85;
  color: var(--text-soft);
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-gold-soft);
  border: 1px solid var(--line-gold-soft);
}

.page-about .about-stat {
  display: grid;
  gap: 0.35rem;
  align-content: start;
  padding: clamp(0.85rem, 2.2vw, 1.35rem);
  background: linear-gradient(160deg, rgba(22, 36, 59, 0.9) 0%, rgba(11, 14, 19, 0.95) 100%);
}

.page-about .about-stat dt {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--text-mute);
}

.page-about .about-stat dd {
  margin: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.15rem);
  line-height: 1.1;
  color: var(--c-gold-bright);
  letter-spacing: 0.02em;
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: 0.6em;
  vertical-align: 0.28em;
  margin-left: 0.1em;
  color: var(--c-gold);
}

/* ---------- 章节吸顶索引 ---------- */

.page-about .about-toc {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
  padding: 0.65rem 0;
  background: rgba(11, 14, 19, 0.96);
  border-bottom: 1px solid var(--line-gold-soft);
  backdrop-filter: blur(8px);
}

.page-about .about-toc ul {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc ul::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc li {
  flex: 0 0 auto;
}

.page-about .about-toc a {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--text-soft);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--line-gold-soft);
  border-radius: 999px;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible,
.page-about .about-toc a.is-active {
  color: var(--c-gold-bright);
  border-color: var(--line-gold);
  background: rgba(196, 154, 88, 0.1);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 3.75rem);
  padding-bottom: clamp(2.75rem, 6.5vw, 5rem);
}

.page-about .about-section + .about-section {
  padding-top: clamp(2.5rem, 6vw, 4.5rem);
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .about-section .section-head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-section .section-head__title {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.page-about .about-section__intro {
  max-width: 68ch;
  font-size: clamp(0.95rem, 1.8vw, 1.05rem);
  line-height: 1.9;
  color: var(--text-soft);
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-section__banner {
  margin-bottom: clamp(1.75rem, 4.5vw, 3rem);
}

/* ---------- 纵向时间轴 ---------- */

.page-about .about-tl {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: about-tl;
}

.page-about .about-tl__item {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: clamp(0.85rem, 2.4vw, 1.75rem);
  align-items: start;
}

.page-about .about-tl__year {
  position: relative;
  padding-right: 0.85rem;
  border-right: 1px solid var(--line-gold-soft);
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 2.4vw, 1.3rem);
  line-height: 1.3;
  color: var(--c-gold-bright);
  letter-spacing: 0.05em;
}

.page-about .about-tl__year::after {
  content: "";
  position: absolute;
  top: 0.42em;
  right: -0.32rem;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--metal-grad);
  box-shadow: 0 0 0 3px rgba(11, 14, 19, 0.9);
}

.page-about .about-tl__body {
  padding: clamp(0.9rem, 2.4vw, 1.6rem);
  border: 1px solid var(--line-gold-soft);
  border-left: 2px solid var(--c-gold);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(22, 36, 59, 0.72) 0%, rgba(11, 14, 19, 0.86) 100%);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-tl__item:hover .about-tl__body {
  border-color: var(--line-gold);
  box-shadow: var(--shadow-gold);
}

.page-about .about-tl__title {
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2.4vw, 1.32rem);
  font-weight: 700;
  line-height: 1.45;
  margin: 0 0 0.5rem;
  color: var(--c-sand);
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 图文错位分栏 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

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

.page-about .about-split__body p {
  font-size: clamp(0.93rem, 1.8vw, 1.02rem);
  line-height: 1.9;
  color: var(--text-soft);
  margin: 0 0 1.15rem;
}

.page-about .about-note {
  font-size: 0.86rem;
  color: var(--text-mute);
  padding-left: 0.9rem;
  border-left: 2px solid var(--c-jade);
}

/* ---------- 区域支持组 ---------- */

.page-about .about-regions {
  display: grid;
  gap: 1px;
  margin: 0 0 1.35rem;
  padding: 0;
  list-style: none;
  background: var(--line-gold-soft);
  border: 1px solid var(--line-gold-soft);
}

.page-about .about-region {
  display: grid;
  gap: 0.3rem;
  padding: 0.85rem 1rem;
  background: var(--c-deep);
}

.page-about .about-region__name {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-gold-bright);
  letter-spacing: 0.02em;
}

.page-about .about-region__desc {
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--text-mute);
}

/* ---------- 团队数据条 ---------- */

.page-about .about-metrics {
  display: grid;
  gap: 1px;
  margin: 1.5rem 0 0;
  background: var(--line-gold-soft);
  border: 1px solid var(--line-gold-soft);
}

.page-about .about-metric {
  display: grid;
  gap: 0.25rem;
  padding: 0.85rem 1rem;
  background: linear-gradient(120deg, rgba(22, 36, 59, 0.85) 0%, rgba(11, 14, 19, 0.9) 100%);
}

.page-about .about-metric dt {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-mute);
}

.page-about .about-metric dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  color: var(--c-gold-bright);
  line-height: 1.45;
}

/* ---------- 认证铭牌 ---------- */

.page-about .about-certs {
  display: grid;
  gap: clamp(0.9rem, 2.4vw, 1.4rem);
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-cert {
  position: relative;
  padding: clamp(1.05rem, 2.6vw, 1.6rem);
  padding-left: clamp(1.05rem, 2.6vw, 1.6rem);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background:
    linear-gradient(150deg, rgba(58, 47, 31, 0.55) 0%, rgba(22, 36, 59, 0.92) 55%, rgba(11, 14, 19, 0.95) 100%);
  box-shadow: var(--shadow-panel);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.page-about .about-cert::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46%;
  height: 2px;
  background: var(--metal-line);
}

.page-about .about-cert:hover,
.page-about .about-cert:focus-visible {
  transform: translateY(-3px);
  border-color: var(--c-gold-bright);
  box-shadow: var(--shadow-gold);
  outline: none;
}

.page-about .about-cert__seal {
  display: inline-block;
  margin-bottom: 0.7rem;
  padding: 0.2rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--c-obsidian);
  background: var(--metal-grad);
  border-radius: 1px;
}

.page-about .about-cert__title {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  font-weight: 700;
  line-height: 1.5;
  margin: 0;
  color: var(--c-sand);
}

.page-about .about-cert__note {
  margin: 0.6rem 0 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text-soft);
  overflow: hidden;
  max-height: 9rem;
  opacity: 1;
  transition: max-height 0.35s ease, opacity 0.35s ease, margin-top 0.35s ease;
}

@media (hover: hover) {
  .page-about .about-cert__note {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
  }

  .page-about .about-cert:hover .about-cert__note,
  .page-about .about-cert:focus-within .about-cert__note,
  .page-about .about-cert:focus-visible .about-cert__note {
    max-height: 9rem;
    opacity: 1;
    margin-top: 0.6rem;
  }
}

/* ---------- 奖项 ---------- */

.page-about .about-awards {
  display: grid;
  gap: clamp(0.9rem, 2.4vw, 1.4rem);
}

.page-about .about-award {
  padding: clamp(1rem, 2.4vw, 1.4rem);
  border-top: 1px solid var(--line-gold-soft);
  border-bottom: 1px solid var(--line-gold-soft);
  background: rgba(16, 27, 45, 0.45);
}

.page-about .about-award__year {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--c-jade-soft);
}

.page-about .about-award__name {
  font-family: var(--font-serif);
  font-size: clamp(1.02rem, 2.2vw, 1.2rem);
  font-weight: 700;
  margin: 0 0 0.4rem;
  color: var(--c-sand);
}

.page-about .about-award__desc {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--text-mute);
}

/* ---------- 合作生态横向带 ---------- */

.page-about .about-partners {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(15rem, 19rem);
  gap: clamp(0.85rem, 2.2vw, 1.35rem);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  padding: 0.25rem 0 1.1rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--c-gold) transparent;
}

.page-about .about-partners::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-partners::-webkit-scrollbar-track {
  background: rgba(196, 154, 88, 0.1);
}

.page-about .about-partners::-webkit-scrollbar-thumb {
  background: var(--c-gold);
  border-radius: 3px;
}

.page-about .about-partner {
  display: grid;
  align-content: start;
  gap: 0.55rem;
  padding: clamp(1rem, 2.4vw, 1.4rem);
  scroll-snap-align: start;
  border: 1px solid var(--line-gold-soft);
  border-radius: var(--radius);
  background: linear-gradient(170deg, rgba(22, 36, 59, 0.9) 0%, rgba(11, 14, 19, 0.92) 100%);
  transition: border-color 0.3s ease, background 0.3s ease;
}

.page-about .about-partner:hover {
  border-color: var(--line-gold);
  background: linear-gradient(170deg, rgba(58, 47, 31, 0.5) 0%, rgba(16, 27, 45, 0.95) 100%);
}

.page-about .about-partner__idx {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--c-gold);
}

.page-about .about-partner__name {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  font-weight: 700;
  margin: 0;
  color: var(--c-sand);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--text-soft);
}

/* ---------- 收尾行动 ---------- */

.page-about .about-cta {
  display: grid;
  gap: clamp(1rem, 3vw, 1.75rem);
  margin-top: clamp(2rem, 5vw, 3.25rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 12% 0%, rgba(58, 47, 31, 0.7) 0%, rgba(16, 27, 45, 0.92) 48%, rgba(11, 14, 19, 0.96) 100%);
  box-shadow: var(--shadow-panel);
}

.page-about .about-cta__text h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 3.2vw, 1.75rem);
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 0.5rem;
  color: var(--c-sand);
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
}

/* ---------- 图片容器微调 ---------- */

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 断点：≥640px ---------- */

@media (min-width: 640px) {
  .page-about .about-certs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-awards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-regions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-region:nth-child(5) {
    grid-column: 1 / -1;
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 断点：≥900px ---------- */

@media (min-width: 900px) {
  .page-about {
    --about-rail: 6.75rem;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.95fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
    align-items: center;
    gap: clamp(2rem, 4.6vw, 4rem);
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-split--flip .about-split__media {
    order: 2;
  }

  .page-about .about-tl__item:nth-child(even) {
    margin-left: 2.25rem;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
    flex-wrap: nowrap;
  }
}

/* ---------- 断点：≥1200px ---------- */

@media (min-width: 1200px) {
  .page-about .about-partners {
    grid-auto-columns: minmax(16rem, 21rem);
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cert,
  .page-about .about-tl__body,
  .page-about .about-partner {
    transition: none;
  }

  .page-about .about-cert:hover {
    transform: none;
  }
}