.page-about {
  --section-gap: clamp(64px, 8vw, 128px);
  --glow-purple: rgba(199, 36, 245, 0.18);
}

.page-about .chapter {
  margin-bottom: var(--section-gap);
  scroll-margin-top: 24px;
}

.page-about .breadcrumb {
  padding-top: 20px;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 32px;
  padding: clamp(40px, 6vw, 88px) 0 48px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: min(480px, 70vw);
  height: min(480px, 70vw);
  background: radial-gradient(circle, var(--glow-purple), transparent 65%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__info,
.page-about .about-hero__media {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--purple);
  margin: 0 0 14px;
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, var(--purple), transparent);
}

.page-about .about-hero__brand-giant {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(68px, 12vw, 150px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--cream);
  background: linear-gradient(180deg, #F2EDE6 10%, rgba(242, 237, 230, 0.28) 95%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  font-family: var(--font-head);
  font-size: clamp(24px, 4vw, 46px);
  line-height: 1.12;
  color: var(--cream);
  max-width: 16em;
}

.page-about .about-hero__statement {
  margin: 0 0 20px;
  display: inline-block;
  font-family: var(--font-body);
  font-style: italic;
  font-size: clamp(20px, 3vw, 32px);
  color: var(--terracotta);
  letter-spacing: 0.08em;
  transform: rotate(-1.6deg);
  transform-origin: left center;
  transition: transform 0.35s var(--ease);
}

.page-about .about-hero__statement:hover {
  transform: rotate(-3.2deg) scale(1.02);
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--gray);
}

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

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

.page-about .about-hero__media img {
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ---------- 本页索引 ---------- */
.page-about .about-index {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: 0 0 var(--section-gap);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-index__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 16px 14px;
  background: var(--bg-black);
  color: var(--gray);
  text-decoration: none;
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-index__item:hover {
  background: rgba(199, 36, 245, 0.1);
  color: var(--cream);
}

.page-about .about-index__num {
  font-family: var(--font-head);
  font-size: 22px;
  color: var(--terracotta);
}

/* ---------- 品牌由来 ---------- */
.page-about .brand-why__body {
  display: grid;
  gap: 28px;
}

.page-about .brand-why__text p {
  margin: 0 0 16px;
  color: var(--gray);
  line-height: 1.85;
}

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

.page-about .brand-why__quote {
  margin: 0;
  max-width: 420px;
}

.page-about .brand-why__quote p {
  margin: 0;
}

.page-about .brand-principles {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .brand-principles li {
  border-left: 2px solid var(--terracotta);
  padding-left: 12px;
  color: var(--cream);
  font-size: 14px;
  line-height: 1.5;
}

.page-about .brand-principles__num {
  display: block;
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--terracotta);
}

/* ---------- 发展历程 ---------- */
.page-about .section-intro,
.page-about .section-outro {
  color: var(--gray);
  line-height: 1.8;
  max-width: 72ch;
}

.page-about .section-intro {
  margin: 0 0 24px;
}

.page-about .section-outro {
  margin: 24px 0 0;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 8px 2px 16px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 82%;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: 2px;
}

.page-about .timeline__item {
  position: relative;
  scroll-snap-align: start;
  padding: 24px 20px 20px;
  background: var(--glass-white);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-left: 2px solid var(--purple);
  border-radius: var(--radius);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .timeline__item:hover {
  transform: translateY(-4px);
  border-color: rgba(199, 36, 245, 0.4);
}

.page-about .timeline__dot {
  position: absolute;
  top: 10px;
  left: -7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--purple);
  box-shadow: 0 0 14px rgba(199, 36, 245, 0.6);
}

.page-about .timeline__tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: rgba(255, 44, 136, 0.12);
  color: var(--pink);
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 22px;
  color: var(--cream);
}

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

/* ---------- 内容目录体系 ---------- */
.page-about .catalog-layout {
  display: grid;
  gap: 28px;
}

.page-about .catalog-copy p {
  margin: 0 0 16px;
  color: var(--gray);
  line-height: 1.85;
}

.page-about .catalog-tree {
  margin: 24px 0 0;
  padding: 18px;
}

.page-about .catalog-tree__heading {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--cream);
}

.page-about .catalog-tree__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 520px;
}

.page-about .catalog-tree__svg .tree-line {
  stroke: rgba(255, 255, 255, 0.2);
  stroke-width: 1.5;
  fill: none;
}

.page-about .catalog-tree__svg text {
  font-family: var(--font-body);
}

.page-about .catalog-subtree {
  margin-top: 18px;
}

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

.page-about .catalog-subtree__list li {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--gray);
  line-height: 1.6;
}

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

.page-about .catalog-figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ---------- 服务承诺 ---------- */
.page-about .promise-grid {
  display: grid;
  gap: 16px;
  margin: 0 0 28px;
}

.page-about .promise-card {
  padding: 22px 20px;
}

.page-about .promise-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .promise-card__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--cream);
}

.page-about .promise-card__title::before {
  content: "";
  width: 10px;
  height: 10px;
  transform: rotate(45deg);
  background: var(--purple);
  box-shadow: 0 0 12px rgba(199, 36, 245, 0.5);
}

.page-about .promise-card:nth-child(2) .promise-card__title::before {
  background: var(--blue);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
}

.page-about .promise-card:nth-child(3) .promise-card__title::before {
  background: var(--pink);
  box-shadow: 0 0 12px rgba(255, 44, 136, 0.5);
}

.page-about .promise-card:nth-child(4) .promise-card__title::before {
  background: var(--moss);
  box-shadow: 0 0 12px rgba(122, 139, 94, 0.5);
}

.page-about .promise-team {
  display: grid;
  gap: 20px;
  align-items: center;
  margin: 0 0 28px;
}

.page-about .promise-team__figure {
  margin: 0;
}

.page-about .promise-team__figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .promise-team__copy p {
  margin: 0 0 14px;
  color: var(--gray);
  line-height: 1.85;
}

.page-about .brand-promise__cta {
  padding: 24px 20px;
  border: 1px solid rgba(199, 36, 245, 0.28);
  background: linear-gradient(135deg, rgba(199, 36, 245, 0.1), rgba(0, 229, 255, 0.04));
  border-radius: var(--radius);
}

.page-about .brand-promise__cta h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 22px;
  color: var(--cream);
}

.page-about .brand-promise__cta p {
  margin: 0 0 18px;
  color: var(--gray);
  line-height: 1.8;
  max-width: 60ch;
}

.page-about .brand-promise__cta-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-index {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .timeline {
    grid-auto-columns: minmax(230px, 1fr);
  }

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

  .page-about .catalog-tree {
    padding: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 3fr 2fr;
    align-items: center;
    padding-top: clamp(48px, 7vw, 104px);
  }

  .page-about .about-hero__info {
    padding-left: clamp(16px, 3vw, 48px);
  }

  .page-about .brand-why__body {
    grid-template-columns: 2fr 1fr;
    align-items: start;
  }

  .page-about .brand-why__quote {
    justify-self: end;
    position: sticky;
    top: 32px;
  }

  .page-about .catalog-layout {
    grid-template-columns: 1.25fr 0.75fr;
    align-items: start;
  }

  .page-about .catalog-tree {
    margin-top: 32px;
  }

  .page-about .promise-team {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .page-about .promise-card {
    padding: 28px 26px;
  }

  .page-about .brand-promise__cta {
    padding: 28px 32px;
  }
}