/* ===== 品牌概况页专属样式 ===== */
.page-about {
  --about-inline-pad: clamp(20px, 4vw, 48px);
  --about-rail-width: 250px;
  padding-bottom: 72px;
}

/* 顶部版本状态条 */
.page-about .about-statusbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px var(--about-inline-pad);
  border-bottom: 1px solid var(--color-iron);
  color: var(--color-gray);
  font-size: 13px;
}

.page-about .about-statusbar__right {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* 首屏框景英雄区 */
.page-about .about-hero {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(32px, 6vw, 72px) var(--about-inline-pad);
  background:
    radial-gradient(circle at 85% 20%, rgba(245, 212, 66, 0.08), transparent 42%),
    linear-gradient(150deg, var(--color-panel) 0%, var(--color-ink) 100%);
  border: 1px solid var(--color-iron);
  border-top: 3px solid var(--color-gold);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  top: 14px;
  bottom: 14px;
  border: 1px solid rgba(245, 212, 66, 0.22);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__stamp {
  position: relative;
  display: table;
  margin: 0 0 16px auto;
  background: var(--color-vermilion);
  color: var(--color-bone);
  font-family: var(--font-heading);
  font-weight: 900;
  padding: 8px 10px;
  line-height: 1.2;
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.08em;
  border-radius: 2px;
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.35);
}

.page-about .about-hero__eyebrow {
  font-size: 12px;
  color: var(--color-gold);
  letter-spacing: 0.18em;
  margin-bottom: 18px;
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(32px, 5.6vw, 68px);
  line-height: 1.18;
  color: var(--color-bone);
  margin: 0 0 20px;
  max-width: 16em;
  text-shadow: 0 0 24px rgba(245, 212, 66, 0.18);
}

.page-about .about-hero__lede {
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--color-gray);
  max-width: 52em;
  margin: 0 0 18px;
}

.page-about .about-hero__meta {
  font-size: 12px;
  color: var(--color-gray);
  letter-spacing: 0.06em;
  margin: 0 0 28px;
}

/* 首屏指标 */
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .about-stat {
  padding: 16px 14px;
  background: var(--color-ink);
  border: 1px solid var(--color-iron);
  position: relative;
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), transparent 72%);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(20px, 3vw, 34px);
  font-weight: 900;
  color: var(--color-gold);
  line-height: 1.1;
}

.page-about .about-stat__label {
  font-size: 13px;
  color: var(--color-gray);
  margin-top: 4px;
  display: block;
}

/* 左右分置框架 */
.page-about .about-frame {
  max-width: 1200px;
  margin: 48px auto 0;
  padding: 0 var(--about-inline-pad);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

/* 左边缘章节导轨 */
.page-about .about-rail {
  border-top: 1px solid var(--color-iron);
  border-bottom: 1px solid var(--color-iron);
  padding: 12px 0;
}

.page-about .about-rail__caption {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--color-gray);
  text-transform: uppercase;
  margin: 0 0 8px;
}

.page-about .about-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--color-gray);
  background: var(--color-panel);
  border: 1px solid var(--color-iron);
  border-radius: 3px;
  padding: 8px 12px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.04em;
  transition: border-color var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
}

.page-about .about-rail__link span {
  color: var(--color-gold);
  font-weight: 600;
}

.page-about .about-rail__link:hover {
  border-color: var(--color-gold);
  color: var(--color-bone);
}

.page-about .about-rail__status {
  display: none;
  padding: 14px;
  background: var(--color-panel);
  border: 1px solid var(--color-iron);
  font-size: 12px;
  color: var(--color-gray);
  line-height: 1.6;
}

.page-about .about-rail__years {
  display: none;
}

/* 章节通用 */
.page-about .about-section {
  border-top: 1px solid var(--color-iron);
  padding-top: 28px;
  margin-top: 40px;
  position: relative;
}

.page-about .about-section:first-child {
  margin-top: 0;
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 88px;
  height: 2px;
  background: var(--color-gold);
}

.page-about .about-section__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .about-section__index {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1;
  color: var(--color-gold);
  opacity: 0.9;
}

.page-about .about-section__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 40px);
  color: var(--color-bone);
  margin: 0;
}

/* 01 平台定位 */
.page-about .about-platform {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-platform__copy p {
  color: var(--color-bone);
  line-height: 1.85;
  margin-bottom: 14px;
  font-size: 15px;
}

.page-about .about-platform__copy .about-list {
  margin: 16px 0 18px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-platform__copy .about-list li {
  position: relative;
  padding-left: 22px;
  color: var(--color-gray);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-platform__copy .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 10px;
  height: 10px;
  background: var(--color-gold);
  transform: rotate(45deg);
}

.page-about .about-platform__note {
  display: inline-block;
  padding: 8px 12px;
  background: var(--color-panel);
  border: 1px solid var(--color-iron);
  font-size: 12px;
  color: var(--color-gray);
  margin: 6px 0 0;
}

.page-about .about-logo-figure {
  margin: 0;
  border: 1px solid var(--color-iron);
  background: var(--color-panel);
  padding: 10px;
}

.page-about .about-logo-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--color-ink);
}

.page-about .about-logo-figure figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-gray);
  text-align: center;
  line-height: 1.6;
}

/* 02 发展历程 */
.page-about .about-map-figure {
  margin: 0 0 28px;
  border: 1px solid var(--color-iron);
  padding: 10px;
  background: var(--color-panel);
}

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

.page-about .about-map-figure figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-gray);
  text-align: center;
  line-height: 1.6;
}

.page-about .about-timeline {
  position: relative;
  margin: 4px 0 0 6px;
  padding-left: 28px;
  border-left: 2px solid var(--color-iron);
}

.page-about .about-tl-item {
  position: relative;
  margin-bottom: 16px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 12px;
  width: 9px;
  height: 9px;
  background: var(--color-gold);
  border: 3px solid var(--color-ink);
  transform: rotate(45deg);
  box-shadow: 0 0 0 1px var(--color-gold);
  transition: background var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

.page-about .about-tl-item[open]::before {
  background: var(--color-vermilion);
  box-shadow: 0 0 0 1px var(--color-vermilion);
}

.page-about .about-tl-item summary {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
  padding: 12px 14px;
  background: var(--color-panel);
  border: 1px solid var(--color-iron);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-out);
}

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

.page-about .about-tl-item summary:hover {
  border-color: var(--color-gold);
}

.page-about .about-tl-item__year {
  font-size: 13px;
  color: var(--color-gold);
}

.page-about .about-tl-item__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 17px;
  color: var(--color-bone);
}

.page-about .about-tl-item__tag {
  margin-left: auto;
  background: var(--color-vermilion);
  color: var(--color-bone);
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 2px 10px;
  border-radius: 2px;
}

.page-about .about-tl-item__tag--gold {
  background: var(--color-gold);
  color: var(--color-ink);
}

.page-about .about-tl-item__body {
  padding: 14px 16px;
  border: 1px solid var(--color-iron);
  border-top: 0;
  background: linear-gradient(180deg, rgba(245, 212, 66, 0.02), transparent 60%);
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
}

.page-about .about-tl-item__body p {
  margin: 0;
}

/* 03 段位体系详解 */
.page-about .about-ranks__lead {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-bone);
  max-width: 46em;
  margin-bottom: 26px;
  padding: 14px 16px;
  background: var(--color-panel);
  border: 1px solid var(--color-iron);
  border-left: 3px solid var(--color-gold);
}

.page-about .about-ranks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-ranks__figure {
  margin: 0;
  border: 1px solid var(--color-iron);
  background: var(--color-panel);
  padding: 10px;
}

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

.page-about .about-ranks__figure figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-gray);
  text-align: center;
  line-height: 1.6;
}

.page-about .about-ranks__list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-iron);
}

.page-about .about-rank {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 4px 14px;
  align-items: baseline;
  padding: 12px;
  border-bottom: 1px solid var(--color-iron);
  cursor: default;
  transition: background var(--duration-fast) var(--ease-out);
  outline: none;
}

.page-about .about-rank__no {
  font-size: 12px;
  color: var(--color-gray);
}

.page-about .about-rank__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  color: var(--color-bone);
  margin: 0;
}

.page-about .about-rank__hint {
  grid-column: 2 / 3;
  font-size: 12px;
  color: var(--color-gray);
  line-height: 1.6;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity var(--duration-base) var(--ease-out), max-height var(--duration-base) var(--ease-out);
}

/* 04 服务规模 */
.page-about .about-scale__lead {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray);
  max-width: 50em;
  margin: 0 0 24px;
}

.page-about .about-scale {
  display: grid;
  gap: 32px;
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .about-scale-card {
  background: var(--color-panel);
  border: 1px solid var(--color-iron);
  padding: 20px 16px;
  position: relative;
  min-height: 110px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
}

.page-about .about-scale-card::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--color-gold);
  opacity: 0.35;
}

.page-about .about-scale-card__num {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 42px);
  color: var(--color-gold);
  line-height: 1;
}

.page-about .about-scale-card__label {
  font-size: 13px;
  color: var(--color-gray);
}

.page-about .about-scale__categories {
  padding-top: 8px;
}

.page-about .about-scale__cats-label {
  font-size: 12px;
  color: var(--color-gray);
  letter-spacing: 0.12em;
  margin: 0 0 12px;
}

.page-about .about-cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.page-about .about-cat-list li {
  border: 1px solid var(--color-iron);
  background: var(--color-panel);
  color: var(--color-bone);
  font-size: 13px;
  padding: 10px 6px;
  text-align: center;
  transition: border-color var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
}

.page-about .about-cat-list li:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.page-about .about-scale__categories-note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-gray);
}

/* 05 官方承诺 */
.page-about .about-promise__lead {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-bone);
  margin: 0 0 24px;
  max-width: 52em;
}

.page-about .about-promise {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-promise__item {
  background: var(--color-panel);
  border: 1px solid var(--color-iron);
  border-top: 2px solid var(--color-gold);
  padding: 18px 18px 16px;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.page-about .about-promise__item:hover {
  border-color: var(--color-gold);
}

.page-about .about-promise__item h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-bone);
  margin: 0 0 8px;
}

.page-about .about-promise__item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-gray);
  margin: 0;
}

/* 出站链接带 */
.page-about .about-outbound {
  max-width: 1200px;
  margin: 56px auto 0;
  padding: 24px var(--about-inline-pad) 0;
  border-top: 1px solid var(--color-iron);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-outbound .btn {
  flex: 0 0 auto;
}

/* 图片基础约束 */
.page-about img {
  max-width: 100%;
  height: auto;
}

/* ===== 平板与桌面增强 ===== */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-cat-list {
    grid-template-columns: repeat(6, 1fr);
  }
}

@media (min-width: 768px) {
  .page-about .about-hero__stamp {
    position: absolute;
    top: 28px;
    right: 28px;
    transform: rotate(3deg);
    margin: 0;
    z-index: 1;
  }

  .page-about .about-platform {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

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

  .page-about .about-promise {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

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

@media (min-width: 960px) {
  .page-about .about-frame {
    grid-template-columns: var(--about-rail-width) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: -webkit-sticky;
    position: sticky;
    top: var(--header-offset);
    border: 0;
    border-right: 1px solid var(--color-iron);
    padding: 0 20px 0 0;
  }

  .page-about .about-rail__inner {
    display: flex;
    flex-direction: column;
    gap: 18px;
  }

  .page-about .about-rail__years {
    display: flex;
    flex-direction: column;
    gap: 2px;
    border-left: 2px solid var(--color-iron);
    padding-left: 16px;
    margin-bottom: 6px;
  }

  .page-about .about-rail__year {
    position: relative;
    font-size: 12px;
    color: var(--color-gray);
    padding: 4px 0 4px 8px;
  }

  .page-about .about-rail__year::before {
    content: "";
    position: absolute;
    left: -21px;
    top: 8px;
    width: 6px;
    height: 6px;
    transform: rotate(45deg);
    background: var(--color-gold);
  }

  .page-about .about-rail__year:last-child::before {
    background: var(--color-vermilion);
  }

  .page-about .about-rail__caption {
    margin-bottom: 0;
  }

  .page-about .about-rail__nav {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid var(--color-iron);
    background: transparent;
    border-radius: 0;
    padding: 10px 12px;
    justify-content: space-between;
  }

  .page-about .about-rail__link:hover {
    border-left-color: var(--color-gold);
    color: var(--color-gold);
    background: linear-gradient(90deg, rgba(245, 212, 66, 0.07), transparent 70%);
  }

  .page-about .about-rail__status {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
  }

  .page-about .about-rail__status .status-dot {
    margin-right: 4px;
  }
}

/* 桌面端悬停展示段位说明 */
@media (hover: hover) {
  .page-about .about-rank:hover,
  .page-about .about-rank:focus,
  .page-about .about-rank:focus-within {
    background: linear-gradient(90deg, rgba(245, 212, 66, 0.08), transparent 70%);
  }

  .page-about .about-rank:hover .about-rank__hint,
  .page-about .about-rank:focus .about-rank__hint,
  .page-about .about-rank:focus-within .about-rank__hint {
    opacity: 1;
    max-height: 4em;
  }
}

/* 触屏与无悬停环境直接显示段位说明 */
@media (max-width: 899px) {
  .page-about .about-rank__hint {
    opacity: 1;
    max-height: 4em;
    overflow: visible;
  }
}