/* ============ 品牌介绍页 · 翻页长卷 ============ */

.page-about {
  background: var(--color-bg);
  overflow-x: hidden;
}

/* ---- 面包屑与页头 ---- */

.page-about .breadcrumb {
  padding-top: 24px;
}

.page-about .breadcrumb__current {
  color: var(--color-primary);
  font-weight: 700;
}

.page-about .page-head {
  padding: 48px 0 56px;
  position: relative;
}

.page-about .page-head::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 28px;
  width: 140px;
  height: 10px;
  background: repeating-linear-gradient(135deg, var(--color-primary) 0 14px, var(--color-accent) 14px 28px);
  opacity: .45;
}

.page-about__head-script {
  font-family: var(--font-accent);
  font-size: 1.5rem;
  color: var(--color-orange);
  margin-right: 10px;
}

.page-about .page-head__index {
  display: flex;
  align-items: center;
  font-family: var(--font-title);
  font-size: .85rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 14px;
}

.page-about .page-head__title {
  font-family: var(--font-title);
  font-size: clamp(2.4rem, 7vw, 4.25rem);
  line-height: 1.08;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.page-about .page-head__desc {
  max-width: 680px;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--color-ink);
  opacity: .82;
  margin-bottom: 24px;
}

.page-about__head-btn {
  display: inline-block;
}

.page-about__toc {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.page-about__toc a {
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.page-about__toc a:hover {
  color: var(--color-orange);
  border-color: var(--color-orange);
}

/* ---- 章节头部 ---- */

.page-about .section__header {
  margin-bottom: 40px;
}

.page-about .section__index {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-title);
  font-size: .9rem;
  letter-spacing: .28em;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.page-about .section__index::before {
  content: "";
  width: 30px;
  height: 5px;
  border-radius: 2px;
  background: var(--color-accent);
}

.page-about .section__index::after {
  content: "";
  width: 9px;
  height: 9px;
  background: var(--color-orange);
  transform: rotate(45deg);
}

.page-about .section__title {
  font-family: var(--font-title);
  font-size: clamp(1.65rem, 4.4vw, 2.6rem);
  line-height: 1.22;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.page-about .section__intro {
  max-width: 540px;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--color-ink);
  opacity: .78;
}

/* ---- 01 品牌主题声明 ---- */

.page-about__statement {
  position: relative;
  background: var(--color-bg);
  background-image: repeating-linear-gradient(0deg, transparent 0 31px, rgba(10,35,66,.03) 31px 32px);
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about__statement::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--color-primary) 0 62%, var(--color-accent) 62% 84%, var(--color-orange) 84% 100%);
}

.page-about__statement-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
}

.page-about__statement-lead {
  font-family: var(--font-title);
  font-size: 1.45rem;
  line-height: 1.55;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.page-about__statement-copy p {
  font-size: .94rem;
  line-height: 1.9;
  color: var(--color-ink);
  opacity: .86;
  margin-bottom: 16px;
}

.page-about__statement-copy .btn {
  margin-top: 10px;
}

.page-about__statement-figure {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--color-line);
  background: var(--color-bg);
  box-shadow: 10px 10px 0 rgba(10,35,66,.08);
}

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

.page-about__handnote {
  font-family: var(--font-accent);
  font-size: 1.45rem;
  line-height: 1.4;
  color: var(--color-primary);
  padding-top: 12px;
  text-align: right;
  transition: transform var(--transition), color var(--transition);
}

.page-about__handnote span {
  color: var(--color-orange);
}

.page-about__handnote:hover {
  transform: scale(1.05) rotate(-1.5deg);
  color: var(--color-orange);
}

.page-about__handnote:hover span {
  color: var(--color-primary);
}

/* ---- 02 迭代演进时间轴 ---- */

.page-about__timeline {
  background: var(--color-primary);
  padding-top: 72px;
  padding-bottom: 68px;
  color: #fff;
}

.page-about__timeline .section__index {
  color: var(--color-accent);
}

.page-about__timeline .section__title {
  color: #fff;
}

.page-about__timeline .section__intro {
  color: rgba(255,255,255,.78);
}

.page-about__timeline-scroll {
  max-width: calc(var(--container-max) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 8px var(--gutter) 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--color-accent) rgba(255,255,255,.14);
  outline: none;
}

.page-about__timeline-scroll:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

.page-about__timeline-scroll::-webkit-scrollbar {
  height: 8px;
}

.page-about__timeline-scroll::-webkit-scrollbar-track {
  background: rgba(255,255,255,.14);
}

.page-about__timeline-scroll::-webkit-scrollbar-thumb {
  background: var(--color-accent);
}

.page-about__timeline-list {
  list-style: none;
  margin: 0;
  padding: 0 0 104px;
  display: flex;
  gap: 20px;
  min-width: 100%;
  width: max-content;
  position: relative;
}

.page-about__timeline-list::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 36px;
  height: 8px;
  background-image: linear-gradient(90deg, rgba(255,255,255,.75) 0 2px, transparent 2px 22px);
  background-size: 22px 100%;
  border-top: 2px solid var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
}

.page-about__timeline-item {
  position: relative;
  flex: 0 0 280px;
  width: 280px;
  padding: 24px 22px 20px;
  background: rgba(255,255,255,.055);
  border: 1px solid rgba(255,255,255,.18);
  scroll-snap-align: start;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.page-about__timeline-item:hover {
  background: rgba(255,255,255,.11);
  border-color: rgba(245,166,35,.55);
  transform: translateY(-5px);
}

.page-about__timeline-ver {
  font-family: var(--font-accent);
  font-size: 2.2rem;
  line-height: 1;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.page-about__timeline-name {
  font-family: var(--font-title);
  font-size: 1.05rem;
  line-height: 1.4;
  color: #fff;
  margin-bottom: 10px;
}

.page-about__timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 12px;
}

.page-about__timeline-tags .pill {
  background: rgba(245,166,35,.14);
  border: 1px solid rgba(245,166,35,.4);
  color: #f0c36e;
  font-size: .74rem;
  line-height: 1;
  padding: 6px 10px;
}

.page-about__timeline-item p:last-child {
  font-size: .88rem;
  line-height: 1.78;
  color: rgba(255,255,255,.72);
  margin-bottom: 0;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 28px;
  bottom: -60px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 6px rgba(245,166,35,.18);
}

.page-about__timeline-item::after {
  content: "";
  position: absolute;
  left: 35px;
  bottom: -44px;
  width: 2px;
  height: 44px;
  background: var(--color-accent);
}

.page-about__timeline-hint {
  margin: 0;
  padding-top: 6px;
  text-align: center;
  font-size: .8rem;
  letter-spacing: .22em;
  color: rgba(255,255,255,.55);
}

.page-about__timeline-arrow {
  display: inline-block;
  margin-right: 6px;
  font-size: 1.1rem;
  color: var(--color-accent);
  animation: page-about-arrow-slide 1.2s ease-in-out infinite;
}

@keyframes page-about-arrow-slide {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(6px); }
}

.page-about__timeline-figure {
  margin: 48px auto 0;
  max-width: 1120px;
  padding: 10px;
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(255,255,255,.04);
}

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

/* ---- 03 服务保障体系 ---- */

.page-about__guarantees {
  background: var(--color-muted);
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about__guarantee-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.page-about__guarantee-note {
  max-width: 380px;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--color-ink);
  margin-bottom: 0;
}

.page-about__guarantee-note a {
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about__fact-strip {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about__fact-strip li {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  padding: 14px 8px;
  text-align: center;
}

.page-about__fact-strip strong {
  display: block;
  font-family: var(--font-accent);
  font-size: 2rem;
  line-height: 1.2;
  color: var(--color-orange);
}

.page-about__fact-strip span {
  font-size: .76rem;
  letter-spacing: .05em;
  color: var(--color-ink);
  opacity: .75;
}

.page-about__guarantee-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__guarantee-item {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-accent);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about__guarantee-item:hover {
  transform: translateY(-6px);
  box-shadow: 6px 6px 0 rgba(10,35,66,.16);
}

.page-about__guarantee-index {
  font-family: var(--font-accent);
  font-size: 2rem;
  line-height: 1;
  color: var(--color-orange);
  margin-bottom: 10px;
}

.page-about__guarantee-item h3 {
  font-family: var(--font-title);
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.page-about__guarantee-item p:last-child {
  font-size: .88rem;
  line-height: 1.8;
  color: var(--color-ink);
  opacity: .8;
  margin-bottom: 0;
}

/* ---- 04 团队与协作 ---- */

.page-about__team {
  background: var(--color-bg);
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about__team-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.page-about__team-figure {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--color-line);
  background: var(--color-muted);
}

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

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

.page-about__team-list li {
  position: relative;
  padding: 16px 16px 16px 56px;
  border-bottom: 1px solid var(--color-line);
  font-size: .9rem;
  line-height: 1.8;
  color: var(--color-ink);
}

.page-about__team-list li:last-child {
  border-bottom: none;
}

.page-about__team-list li::before {
  counter-increment: page-about-team;
  content: "0" counter(page-about-team);
  position: absolute;
  left: 0;
  top: 16px;
  font-family: var(--font-accent);
  font-size: 1.5rem;
  line-height: 1.4;
  color: var(--color-accent);
}

.page-about__team-list li span {
  display: block;
  font-family: var(--font-title);
  font-size: 1rem;
  line-height: 1.4;
  color: var(--color-primary);
  margin-bottom: 2px;
}

.page-about__team-closer {
  margin-top: 56px;
  padding: 32px;
  background: var(--color-rime);
  border-top: 4px solid var(--color-primary);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
}

.page-about__team-quote {
  font-family: var(--font-accent);
  font-size: 1.8rem;
  line-height: 1.4;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.page-about__team-closer .btn {
  margin: 0;
}

/* ---- 响应式 ---- */

@media (min-width: 640px) {
  .page-about__guarantee-list {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .page-head {
    padding-top: 72px;
    padding-bottom: 76px;
  }

  .page-about .page-head__desc {
    font-size: 1.05rem;
  }

  .page-about__statement-split {
    grid-template-columns: 1.08fr 1fr;
    gap: 64px;
    align-items: center;
  }

  .page-about__statement-lead {
    font-size: 1.65rem;
  }

  .page-about__guarantee-split {
    grid-template-columns: 360px 1fr;
    gap: 64px;
  }

  .page-about__team-split {
    grid-template-columns: 1fr 1.05fr;
    gap: 64px;
  }

  .page-about__team-closer {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }

  .page-about__team-closer > div {
    max-width: 680px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__timeline-arrow {
    animation: none;
  }

  .page-about__timeline-item,
  .page-about__guarantee-item,
  .page-about__handnote,
  .page-about__toc a {
    transition: none;
  }
}