/* ===== 品牌殿堂 / page-about ===== */

.page-about {
  --about-ink: #14261F;
  --about-gap: clamp(26px, 4.5vw, 56px);
  background: var(--temple-900);
  color: var(--paper);
  padding-bottom: clamp(56px, 9vw, 128px);
  overflow-x: hidden;
}

/* --- 面包屑行 --- */
.page-about .about-crumb-row {
  padding-top: clamp(16px, 3vw, 32px);
}

/* --- 首屏 --- */
.page-about .about-hero {
  padding: clamp(30px, 5.5vw, 68px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--hairline);
  background:
    radial-gradient(120% 80% at 88% -10%, rgba(25, 227, 198, 0.10), transparent 60%),
    radial-gradient(90% 70% at 4% 110%, rgba(255, 90, 43, 0.08), transparent 62%);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 74px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 18em;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--gold-index);
  display: inline-block;
}

.page-about .about-hero__lede {
  margin-top: clamp(18px, 2.6vw, 28px);
  max-width: 42em;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(30px, 4.6vw, 54px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-stat {
  border-top: 1px solid var(--hairline-soft);
  padding-top: 14px;
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--mono);
  font-size: clamp(38px, 7vw, 66px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* --- 主布局：左索引 + 右正文 --- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  padding-top: var(--about-gap);
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 3.4vw, 40px);
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold-index);
}

/* 目录索引 */
.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.page-about .about-index__item {
  border-top: 1px solid var(--hairline-soft);
}

.page-about .about-index__item:last-child {
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .about-index__link {
  display: grid;
  grid-template-columns: 2.4em 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 11px 0;
  text-decoration: none;
  color: var(--paper-dim);
  font-size: 14px;
  line-height: 1.5;
  transition: color var(--speed) var(--ease);
}

.page-about .about-index__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-line);
  transition: color var(--speed) var(--ease);
}

.page-about .about-index__txt {
  position: relative;
}

.page-about .about-index__txt::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  height: 1px;
  width: 0;
  background: var(--gold-line);
  transition: width var(--speed) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
}

.page-about .about-index__link:hover .about-index__num,
.page-about .about-index__link:focus-visible .about-index__num {
  color: var(--cyan);
}

.page-about .about-index__link:hover .about-index__txt::after,
.page-about .about-index__link:focus-visible .about-index__txt::after {
  width: 100%;
}

/* 阶段索引刻度柱 */
.page-about .mini-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  position: relative;
}

.page-about .mini-timeline::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-line), var(--hairline-soft));
}

.page-about .mini-timeline__node {
  position: relative;
  padding: 7px 0;
}

.page-about .mini-timeline__dot {
  position: absolute;
  left: -18px;
  top: 13px;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(25, 227, 198, 0.12);
  transition: background var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.page-about .mini-timeline__body {
  display: block;
}

.page-about .mini-timeline__name {
  display: block;
  font-size: 14px;
  color: var(--paper-dim);
  letter-spacing: 0.02em;
  transition: color var(--speed) var(--ease);
}

.page-about .mini-timeline__note {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.24s var(--ease), opacity 0.24s var(--ease);
}

.page-about .mini-timeline__note > span {
  overflow: hidden;
  display: block;
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .mini-timeline__node:hover .mini-timeline__note,
.page-about .mini-timeline__node:focus-within .mini-timeline__note {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 5px;
}

.page-about .mini-timeline__node:hover .mini-timeline__name,
.page-about .mini-timeline__node:focus-within .mini-timeline__name {
  color: var(--paper);
}

.page-about .mini-timeline__node:hover .mini-timeline__dot,
.page-about .mini-timeline__node:focus-within .mini-timeline__dot {
  background: var(--ember);
  box-shadow: 0 0 0 4px rgba(255, 90, 43, 0.16);
}

/* --- 章节正文列 --- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(52px, 8vw, 104px);
  min-width: 0;
}

.page-about .about-chapter {
  min-width: 0;
}

.page-about .about-chapter__num {
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-chapter__num span {
  font-family: var(--mono);
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-index);
}

.page-about .about-chapter__num::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  max-width: 220px;
  background: linear-gradient(90deg, var(--gold-line), transparent);
}

.page-about .about-chapter__title {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-chapter__intro {
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-chapter__body p {
  margin: 0 0 1.15em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-dim);
  max-width: 40em;
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 227, 198, 0.4);
  transition: border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}

.page-about .about-chapter__body a:hover,
.page-about .about-chapter__body a:focus-visible {
  color: var(--gold-index);
  border-bottom-color: var(--gold-line);
}

.page-about .about-chapter__figure {
  margin: clamp(24px, 3.6vw, 40px) 0 0;
}

/* --- 团队技能树 --- */
.page-about .team-tree {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin: clamp(20px, 3vw, 32px) 0 clamp(22px, 3vw, 34px);
}

.page-about .team-tree__branch {
  position: relative;
  background: linear-gradient(180deg, var(--glass), rgba(244, 237, 221, 0.02));
  border: 1px solid var(--hairline-soft);
  border-left: 2px solid var(--gold-line);
  padding: clamp(18px, 2.4vw, 26px);
  transition: border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .team-tree__branch:hover,
.page-about .team-tree__branch:focus-visible {
  border-left-color: var(--cyan);
  background: linear-gradient(180deg, var(--glass-strong), rgba(244, 237, 221, 0.02));
}

.page-about .team-tree__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .team-tree__count {
  font-family: var(--mono);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.03em;
}

.page-about .team-tree__role {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--gold-index);
}

.page-about .team-tree__duties {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .team-tree__duties li {
  position: relative;
  padding: 7px 0 7px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-dim);
}

.page-about .team-tree__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 9px;
  height: 1px;
  background: var(--gold-line);
}

/* --- 复核流程 --- */
.page-about .review-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 40px);
}

.page-about .review-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.page-about .review-step {
  border-top: 1px solid var(--hairline-soft);
  padding: 18px 0;
}

.page-about .review-step:last-child {
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .review-step__idx {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold-line);
  margin-bottom: 6px;
}

.page-about .review-step__title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .review-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 36em;
}

.page-about .review-figure {
  margin: 0;
}

/* --- 延伸入口 --- */
.page-about .about-doors {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 3.6vw, 42px);
  background: var(--hairline-soft);
  border: 1px solid var(--hairline-soft);
}

.page-about .about-door {
  display: block;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--temple-850);
  text-decoration: none;
  transition: background var(--speed) var(--ease);
}

.page-about .about-door__label {
  display: block;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.4;
  color: var(--paper);
  position: relative;
  padding-right: 22px;
}

.page-about .about-door__label::after {
  content: "→";
  position: absolute;
  right: 0;
  top: 0;
  color: var(--gold-line);
  transition: transform var(--speed) var(--ease), color var(--speed) var(--ease);
}

.page-about .about-door__note {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-door:hover,
.page-about .about-door:focus-visible {
  background: var(--temple-800);
}

.page-about .about-door:hover .about-door__label::after,
.page-about .about-door:focus-visible .about-door__label::after {
  transform: translateX(4px);
  color: var(--cyan);
}

/* --- 焦点可达 --- */
.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* --- 窄屏微调 --- */
@media (max-width: 559px) {
  .page-about .about-hero__title {
    max-width: none;
  }

  .page-about .about-index__link {
    grid-template-columns: 2em 1fr;
    font-size: 13px;
  }

  .page-about .review-step {
    padding: 15px 0;
  }
}

/* --- 平板：纵向尺度放大 --- */
@media (min-width: 600px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 3vw, 36px);
  }

  .page-about .team-tree {
    flex-direction: row;
    align-items: stretch;
  }

  .page-about .team-tree__branch--wide {
    flex: 7 1 0;
  }

  .page-about .team-tree__branch--narrow {
    flex: 4 1 0;
  }

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

/* --- 桌面：左索引 + 右正文，非对称栏宽 --- */
@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: minmax(190px, 232px) minmax(0, 1fr);
    gap: clamp(40px, 4.6vw, 76px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .review-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: start;
    gap: clamp(28px, 3.4vw, 48px);
  }

  .page-about .review-figure {
    position: sticky;
    top: 104px;
  }

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

/* --- 动效克制 --- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}