/* ============================================================
   page-about : 品牌文化
   档案馆式长卷 —— 左侧索引固定，右侧留白叙述，竖向时间线贯穿
   ============================================================ */

.page-about {
  --about-axis-line: rgba(142, 155, 189, .26);
  --about-glow: rgba(53, 242, 160, .5);
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 56px 0 52px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(142, 155, 189, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(142, 155, 189, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -18%;
  width: 60vw;
  height: 60vw;
  max-width: 620px;
  max-height: 620px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53, 242, 160, .14) 0%, rgba(41, 200, 255, .05) 42%, transparent 70%);
  pointer-events: none;
}

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

.page-about .about-hero__eyebrow {
  margin: 26px 0 0;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(32px, 6.2vw, 70px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .about-hero__accent {
  color: var(--neon);
}

.page-about .about-hero__lede {
  margin: 26px 0 0;
  max-width: 56ch;
  color: var(--paper);
  opacity: .84;
  font-size: 16.5px;
  line-height: 1.82;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 44px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--ink-900);
  padding: 18px 20px 20px;
}

.page-about .about-stat__value {
  display: block;
  font-size: 26px;
  letter-spacing: .02em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  padding-bottom: 78px;
}

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

/* ---------- 左侧章节索引（移动端为横向滑动条） ---------- */

.page-about .about-index {
  padding: 22px 0 18px;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__eyebrow {
  margin: 0 0 14px;
}

.page-about .about-index__list {
  display: flex;
  gap: 22px;
  margin: 0;
  padding: 0 2px 3px;
  list-style: none;
  white-space: nowrap;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 5px;
  border-bottom: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
  text-decoration: none;
  transition: color .25s ease, border-color .25s ease;
}

.page-about .about-index__link .num {
  font-size: 11px;
}

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

.page-about .about-index__link[aria-current] {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ---------- 章节 ---------- */

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

.page-about .about-chapter {
  padding: 48px 0 56px;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 42px;
}

.page-about .about-chapter__head {
  margin-bottom: 26px;
}

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

.page-about .about-chapter__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--paper);
  max-width: 24ch;
}

.page-about .about-chapter__body > p {
  margin: 0 0 18px;
  font-size: 16.5px;
  line-height: 1.84;
  color: rgba(242, 245, 255, .82);
  max-width: 62ch;
}

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

/* ---------- 图 ---------- */

.page-about .about-figure {
  margin: 30px 0 30px;
}

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

/* ---------- 收录三步 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: 28px 0 30px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-step {
  position: relative;
  background: var(--ink-900);
  padding: 26px 22px 28px;
  transition: background .3s ease;
}

.page-about .about-step:hover {
  background: var(--ink-800);
}

.page-about .about-step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-step__title {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 245, 255, .76);
}

/* ---------- 团队档案卡 ---------- */

.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 28px 0 30px;
}

.page-about .about-team {
  position: relative;
  padding: 26px 22px 28px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  transition: border-color .3s ease, box-shadow .35s ease, transform .35s ease;
}

.page-about .about-team:hover,
.page-about .about-team:focus-within {
  border-color: rgba(53, 242, 160, .48);
  box-shadow: 0 0 0 1px rgba(53, 242, 160, .16), 0 22px 44px -28px var(--about-glow);
  transform: translateY(-3px);
}

.page-about .about-team__tag {
  display: inline-block;
}

.page-about .about-team__name {
  margin: 14px 0 10px;
  font-size: 18.5px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 245, 255, .78);
}

.page-about .about-team__more {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(53, 242, 160, .3);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--neon);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline__track {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-timeline__node {
  position: relative;
  background: var(--ink-900);
  padding: 28px 22px 26px;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  width: 38px;
  height: 2px;
  background: var(--neon);
  box-shadow: 0 0 16px var(--about-glow);
}

.page-about .about-timeline__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-timeline__desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 245, 255, .78);
}

/* ---------- 安心三件事 ---------- */

.page-about .about-assure {
  margin: 26px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-assure__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 0 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-assure__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .about-assure__title {
  margin: 0 0 9px;
  font-size: 17.5px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-assure__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(242, 245, 255, .78);
  max-width: 58ch;
}

/* ---------- 行动入口 ---------- */

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

/* ============================================================
   平板及以上
   ============================================================ */

@media (min-width: 720px) {

  .page-about .about-hero {
    padding: 78px 0 66px;
  }

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

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

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

  /* 竖向时间轴刻度 */
  .page-about .about-chapter {
    position: relative;
    padding-left: 34px;
  }

  .page-about .about-chapter::before {
    content: "";
    position: absolute;
    left: 0;
    top: 66px;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, var(--about-axis-line) 0%, transparent 86%);
  }

  .page-about .about-chapter::after {
    content: "";
    position: absolute;
    left: -4px;
    top: 60px;
    width: 9px;
    height: 9px;
    border: 1px solid var(--neon);
    background: var(--ink-900);
    box-shadow: 0 0 14px var(--about-glow);
  }

  .page-about .about-assure__item {
    grid-template-columns: 56px minmax(0, 1fr);
    padding: 28px 0;
  }
}

/* ============================================================
   桌面：左侧索引固定，右侧长卷叙述
   ============================================================ */

@media (min-width: 960px) {

  .page-about .about-body {
    padding-bottom: 96px;
  }

  .page-about .about-body__inner {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 68px;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
    align-self: start;
    padding: 0;
    border-bottom: 0;
    overflow: visible;
  }

  .page-about .about-index__eyebrow {
    margin: 0 0 16px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    white-space: normal;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index__link {
    display: flex;
    align-items: baseline;
    padding: 12px 0 12px 18px;
    margin-left: -1px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    transition: color .25s ease, border-color .25s ease, background .25s ease;
  }

  .page-about .about-index__link:hover {
    color: var(--paper);
    background: rgba(53, 242, 160, .04);
  }

  .page-about .about-index__link[aria-current] {
    color: var(--neon);
    border-bottom-color: transparent;
    border-left-color: var(--neon);
    background: linear-gradient(90deg, rgba(53, 242, 160, .09), transparent 82%);
  }

  /* 档案卡错落悬停 */
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-team:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-team:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-chapter {
    padding: 62px 0 70px;
    padding-left: 40px;
  }

  .page-about .about-chapter:first-child {
    padding-top: 52px;
  }

  .page-about .about-chapter__body > p {
    font-size: 17px;
  }
}

/* ============================================================
   悬停展开：仅在支持悬停的设备上收起补充说明
   ============================================================ */

@media (hover: hover) and (min-width: 720px) {

  .page-about .about-team__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height .45s ease, opacity .35s ease, margin-top .45s ease, padding-top .45s ease, border-color .45s ease;
  }

  .page-about .about-team:hover .about-team__more,
  .page-about .about-team:focus-within .about-team__more {
    max-height: 10em;
    opacity: 1;
    margin-top: 0;
    padding-top: 12px;
    border-top-color: rgba(53, 242, 160, .3);
  }
}

/* ============================================================
   大屏收束
   ============================================================ */

@media (min-width: 1240px) {

  .page-about .about-hero__title {
    max-width: 16ch;
  }

  .page-about .about-chapter {
    max-width: 940px;
  }
}

/* ============================================================
   减少动效
   ============================================================ */

@media (prefers-reduced-motion: reduce) {

  .page-about .about-step,
  .page-about .about-team,
  .page-about .about-team__more,
  .page-about .about-index__link {
    transition: none !important;
  }

  .page-about .about-team:hover,
  .page-about .about-team:focus-within {
    transform: none;
  }
}