/* ===== 品牌档案页 page-about ===== */
.page-about {
  --about-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --about-cut: 18px;
  background: var(--color-mist);
  color: var(--color-deep);
}

.page-about__dossier {
  padding-bottom: 4rem;
}

/* ---------- 卷宗头部 ---------- */
.page-about .dossier-hero {
  position: relative;
  background: linear-gradient(135deg, var(--color-ice) 0%, var(--color-mist) 100%);
  border-bottom: 1px solid var(--color-glacier);
  padding: 2rem 0 3rem;
  overflow: hidden;
}

.page-about .dossier-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 22px,
    rgba(182, 201, 211, 0.18) 22px,
    rgba(182, 201, 211, 0.18) 23px
  );
  pointer-events: none;
}

.page-about .dossier-hero::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 260px;
  height: 260px;
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  opacity: 0.08;
  transform: rotate(12deg);
}

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

.page-about .dossier-hero .breadcrumb {
  margin-bottom: 0;
}

.page-about .dossier-hero__content {
  margin-top: 2rem;
  max-width: 760px;
}

.page-about .dossier-hero__kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-accent);
  border: 1px solid var(--color-glacier);
  border-left: 3px solid var(--color-accent);
  padding: 0.35rem 0.7rem;
  background: rgba(255, 255, 255, 0.6);
  margin-bottom: 1rem;
}

.page-about .dossier-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 2.2rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

.page-about .dossier-hero__lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-rock);
  margin: 0;
  max-width: 640px;
}

.page-about .dossier-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stat-card {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--color-glacier);
  border-right: 3px solid var(--color-accent);
  padding: 0.7rem 0.8rem;
  backdrop-filter: blur(4px);
  min-width: 0;
}

.page-about .stat-card dt {
  font-size: 12px;
  color: var(--color-rock);
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.page-about .stat-card dd {
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--color-deep);
  white-space: nowrap;
}

/* ---------- 主体两列 ---------- */
.page-about .dossier-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
}

/* ---------- 左栏摘要 ---------- */
.page-about .dossier-aside {
  position: relative;
  min-width: 0;
}

.page-about .dossier-aside__sticky {
  position: relative;
  background: var(--color-snow);
  border: 1px solid var(--color-glacier);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  padding: 2rem 1.5rem 1.5rem;
  overflow: hidden;
}

.page-about .dossier-aside__watermark {
  position: absolute;
  right: -0.5rem;
  bottom: -0.9rem;
  font-size: 4.8rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--color-ice);
  line-height: 1;
  white-space: nowrap;
  z-index: 0;
  pointer-events: none;
}

.page-about .dossier-aside__index {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--color-accent);
  margin: 0 0 0.5rem;
}

.page-about .dossier-aside__title {
  font-size: 1.25rem;
  font-weight: 900;
  margin: 0 0 1.25rem;
  position: relative;
  z-index: 1;
}

.page-about .dossier-aside__list {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
  z-index: 1;
}

.page-about .dossier-aside__list > div {
  padding: 0.7rem 0;
  border-top: 1px solid var(--color-glacier);
}

.page-about .dossier-aside__list dt {
  font-size: 12px;
  color: var(--color-rock);
  letter-spacing: 0.08em;
  margin-bottom: 0.15rem;
}

.page-about .dossier-aside__list dd {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-deep);
}

.page-about .dossier-aside__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
  position: relative;
  z-index: 1;
}

.page-about .dossier-aside .btn {
  font-size: 14px;
  padding: 0.6rem 1rem;
}

/* ---------- 右栏内容流 ---------- */
.page-about .dossier-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}

.page-about .archive-block {
  position: relative;
}

.page-about .archive-block__head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-glacier);
}

.page-about .archive-block__head .section__index {
  font-size: 2rem;
  font-weight: 100;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  line-height: 1;
  min-width: 3.5rem;
}

.page-about .archive-block__head h2 {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin: 0 0 0.2rem;
  line-height: 1.2;
}

.page-about .archive-block__lede {
  margin: 0;
  font-size: 13px;
  color: var(--color-rock);
  letter-spacing: 0.08em;
}

/* ---------- 01 运营档案 ---------- */
.page-about .archive-block--op {
  background: var(--color-ice);
  padding: 1.25rem;
  clip-path: polygon(0 0, calc(100% - var(--about-cut) * 2) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .archive-block__hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  margin: 0 0 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.page-about .archive-block__body h3 {
  font-size: 1.15rem;
  font-weight: 900;
  margin: 0 0 0.75rem;
}

.page-about .archive-block__body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-rock);
  margin: 0 0 1rem;
}

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

/* ---------- 02 服务能力 ---------- */
.page-about .cap-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .cap-card {
  position: relative;
  background: var(--color-snow);
  border: 1px solid var(--color-glacier);
  border-top: 3px solid var(--color-accent);
  padding: 1.25rem;
  transition: transform 0.15s var(--about-ease), box-shadow 0.15s var(--about-ease), border-color 0.15s var(--about-ease);
}

.page-about .cap-card:hover,
.page-about .cap-card:focus,
.page-about .cap-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-raised);
  outline: none;
}

.page-about .cap-card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.page-about .cap-card__top {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}

.page-about .cap-card__top h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 900;
}

.page-about .cap-card__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-rock);
}

.page-about .cap-card__hover {
  display: block;
  margin: 0.75rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--color-glacier);
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-deep);
}

/* ---------- 03 维护与版本 ---------- */
.page-about .archive-block--maintain {
  background: var(--color-snow);
  border: 1px solid var(--color-glacier);
  padding: 1.25rem;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .maintain-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .maintain-flow img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--color-glacier);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0.25rem 0 0 1.5rem;
  border-left: 2px solid var(--color-ice);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 1.5rem;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 6px);
  top: 0.25rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(255, 90, 42, 0.15);
}

.page-about .timeline__meta {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-rock);
  margin-bottom: 0.2rem;
}

.page-about .timeline__details summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

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

.page-about .timeline__details summary h3 {
  display: inline;
  font-size: 1.05rem;
  font-weight: 900;
  margin: 0;
  transition: color 0.15s var(--about-ease);
}

.page-about .timeline__details summary::after {
  content: "＋";
  color: var(--color-glacier);
  font-size: 1.1rem;
  transition: transform 0.2s var(--about-ease), color 0.15s var(--about-ease);
}

.page-about .timeline__details[open] summary::after {
  content: "－";
  color: var(--color-accent);
  transform: rotate(180deg);
}

.page-about .timeline__details summary:hover h3,
.page-about .timeline__details summary:focus-visible h3 {
  color: var(--color-accent);
}

.page-about .timeline__details summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.page-about .timeline__body {
  margin-top: 0.6rem;
  padding-left: 0.5rem;
}

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

/* ---------- 04 联络通道 ---------- */
.page-about .archive-block--contact {
  background: linear-gradient(180deg, var(--color-ice) 0%, var(--color-snow) 60%);
  padding: 1.25rem;
}

.page-about .contact-panel {
  background: var(--color-snow);
  border: 1px solid var(--color-glacier);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  padding: 1.25rem;
}

.page-about .contact-panel__map img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--color-glacier);
}

.page-about .contact-panel__list {
  margin: 0;
  padding: 0;
}

.page-about .contact-row {
  display: flex;
  flex-direction: column;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--color-glacier);
}

.page-about .contact-row:first-child {
  padding-top: 0;
}

.page-about .contact-row dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-rock);
}

.page-about .contact-row dd {
  margin: 0.2rem 0 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-deep);
  word-break: break-all;
}

.page-about .contact-panel__note {
  margin: 1rem 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-rock);
  background: rgba(201, 106, 75, 0.08);
  border-left: 3px solid var(--color-clay);
  padding: 0.7rem 0.9rem;
}

/* ---------- 信任声明 ---------- */
.page-about .dossier-trust {
  margin: 0;
  padding: 1.25rem;
  background: var(--color-ice);
  color: var(--color-rock);
  font-size: 13px;
  line-height: 1.7;
  text-align: center;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 768px) {
  .page-about .dossier-hero__title {
    font-size: 2.6rem;
  }

  .page-about .dossier-hero__stats {
    justify-content: end;
    margin-top: 2.5rem;
  }

  .page-about .archive-block--op {
    padding: 1.5rem;
  }

  .page-about .cap-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .page-about .contact-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
  }

  .page-about .contact-panel__map {
    margin-bottom: 0;
  }

  .page-about .contact-panel__note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .page-about .dossier-hero {
    padding: 3rem 0 4rem;
  }

  .page-about .dossier-hero__content {
    margin-top: 2.5rem;
    max-width: 780px;
  }

  .page-about .dossier-hero__title {
    font-size: 3.2rem;
  }

  .page-about .dossier-hero__stats {
    grid-template-columns: repeat(3, minmax(180px, 210px));
    justify-content: end;
    margin-top: 2rem;
  }

  .page-about .dossier-layout {
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 3rem;
    padding-top: 3.5rem;
    padding-bottom: 4rem;
  }

  .page-about .dossier-aside__sticky {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
  }

  .page-about .dossier-main {
    gap: 4.5rem;
  }

  .page-about .archive-block__head .section__index {
    font-size: 3.6rem;
  }

  .page-about .archive-block__head h2 {
    font-size: 1.8rem;
  }

  .page-about .archive-block__hero-img {
    max-height: 420px;
  }

  .page-about .cap-card__hover {
    display: none;
  }

  .page-about .cap-card:hover .cap-card__hover,
  .page-about .cap-card:focus .cap-card__hover,
  .page-about .cap-card:focus-within .cap-card__hover {
    display: block;
  }

  .page-about .maintain-wrap {
    grid-template-columns: 320px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .contact-panel {
    grid-template-columns: 260px 1fr;
  }
}