/* ============================================
   品牌概况页 · Brand Profile
   作用域：.page-about
   ============================================ */

.page-about {
  --about-accent: #FF6B2C;
  --about-bg: #0A1428;
  --about-bg-panel: #101F3C;
  --about-bg-card: #1B2F52;
  --about-line: #2A4073;
  --about-text: #E8EEF8;
  --about-text-2: #C5D3E8;
  position: relative;
  background: linear-gradient(180deg, #0A1428 0%, #101F3C 100%);
}

/* ---------- Hero 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 64px;
  border-bottom: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-hero__crumbs {
  margin-bottom: 36px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
  position: relative;
  z-index: 2;
}

.page-about .about-hero__heading {
  position: relative;
  padding-left: 18px;
}

.page-about .about-hero__heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--about-accent);
  transform: skewY(-10deg);
}

.page-about .about-hero__heading h1 {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: var(--size-display);
  line-height: 0.95;
  margin: 14px 0 20px;
  letter-spacing: 0.01em;
  color: var(--about-text);
}

.page-about .about-hero__lead {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--about-text-2);
  max-width: 34em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* Facts 数据速览 */
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0;
}

.page-about .about-fact {
  background: var(--about-bg-panel);
  border: 1px solid var(--about-line);
  padding: 18px 16px 16px 20px;
  position: relative;
  min-width: 0;
}

.page-about .about-fact::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--about-accent);
}

.page-about .about-fact dt {
  font-size: var(--size-small);
  color: var(--about-text-2);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about .about-fact dd {
  margin: 8px 0 0;
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-style: italic;
  color: var(--about-text);
  line-height: 1.1;
}

/* 长城剪影 */
.page-about .about-hero__wall {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: auto;
  z-index: 1;
  pointer-events: none;
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-versions__layout {
  display: grid;
  gap: 48px;
  margin-top: 44px;
}

.page-about .about-versions__timeline {
  position: relative;
  padding-left: 56px;
}

.page-about .about-versions__timeline::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(180deg, var(--about-line) 0%, var(--about-line) 70%, transparent 100%);
}

.page-about .version-entry {
  position: relative;
  margin-bottom: 32px;
}

.page-about .version-entry:last-child {
  margin-bottom: 0;
}

.page-about .version-entry__marker {
  position: absolute;
  left: 14px;
  top: 2px;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
}

.page-about .version-entry__marker svg {
  width: 36px;
  height: 36px;
  display: block;
}

.page-about .version-entry--current .version-entry__marker {
  width: 44px;
  height: 44px;
}

.page-about .version-entry--current .version-entry__marker svg {
  width: 44px;
  height: 44px;
}

.page-about .version-entry__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .version-entry__year {
  font-size: var(--size-small);
  color: var(--about-text-2);
  letter-spacing: 0.12em;
}

.page-about .version-entry__content h3 {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 1.4rem;
  margin: 0 0 10px;
  color: var(--about-text);
}

.page-about .version-entry__content > p {
  margin: 0;
  color: var(--about-text-2);
  line-height: 1.7;
  font-size: var(--size-body);
}

.page-about .version-details {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
}

.page-about .version-details summary {
  cursor: pointer;
  color: var(--about-accent);
  font-size: var(--size-small);
  font-weight: 600;
  list-style: none;
  padding-left: 22px;
  position: relative;
}

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

.page-about .version-details summary::before {
  content: "+";
  position: absolute;
  left: 0;
  top: -2px;
  font-size: 1.2rem;
  line-height: 1.4;
  color: var(--about-accent);
}

.page-about .version-details[open] summary::before {
  content: "–";
}

.page-about .version-details ul {
  margin: 14px 0 0;
  padding-left: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .version-details li {
  position: relative;
  padding-left: 16px;
  color: var(--about-text-2);
  font-size: var(--size-small);
  line-height: 1.6;
}

.page-about .version-details li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  background: var(--about-accent);
  transform: rotate(45deg);
}

/* 版本图 */
.page-about .about-versions__figure {
  margin: 0;
}

.page-about .about-versions__figure .img-shell {
  aspect-ratio: 2 / 3;
}

.page-about .about-versions__figure figcaption {
  margin-top: 12px;
  font-size: var(--size-small);
  color: var(--about-text-2);
  text-align: center;
}

/* ---------- 数据标准 ---------- */
.page-about .about-data {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-data__grid {
  display: grid;
  gap: 36px;
  margin-top: 44px;
}

.page-about .about-data__steps {
  display: grid;
  gap: 20px;
}

.page-about .data-step {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
  align-items: start;
}

.page-about .data-step__num {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 1.5rem;
  color: var(--about-accent);
  line-height: 1;
  padding-top: 4px;
}

.page-about .data-step h3 {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 1.25rem;
  margin: 0 0 8px;
  color: var(--about-text);
}

.page-about .data-step p {
  margin: 0;
  color: var(--about-text-2);
  line-height: 1.65;
}

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

.page-about .about-data__figure .img-shell {
  aspect-ratio: 9 / 5;
}

.page-about .about-data__figure figcaption {
  margin-top: 12px;
  font-size: var(--size-small);
  color: var(--about-text-2);
  text-align: center;
}

.page-about .about-data__quote {
  margin: 0;
  background: var(--about-bg-card);
  border-left: 4px solid var(--about-accent);
  padding: 24px;
}

.page-about .about-data__quote p {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--about-text);
  margin: 0 0 12px;
}

.page-about .about-data__quote cite {
  font-size: var(--size-small);
  font-style: normal;
  color: var(--about-text-2);
}

/* ---------- 团队与资质 ---------- */
.page-about .about-team {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-team__layout {
  display: grid;
  gap: 36px;
  margin-top: 44px;
}

.page-about .about-team__desc {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--about-text-2);
  margin: 0;
}

.page-about .about-team__list {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__list li {
  padding: 14px 0 14px 18px;
  border-left: 2px solid var(--about-line);
  line-height: 1.65;
  color: var(--about-text-2);
  position: relative;
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 22px;
  width: 8px;
  height: 8px;
  background: var(--about-accent);
  transform: rotate(45deg);
}

.page-about .about-team__list strong {
  display: block;
  color: var(--about-text);
  font-size: 1.05rem;
  margin-bottom: 4px;
  font-weight: 600;
}

.page-about .about-team__cert {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--about-bg-card);
  border: 1px solid var(--about-line);
  padding: 16px 18px;
  font-size: var(--size-small);
  color: var(--about-text);
  line-height: 1.7;
}

.page-about .about-team__cert svg {
  flex-shrink: 0;
  margin-top: 2px;
}

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

.page-about .about-team__figure .img-shell {
  aspect-ratio: 3 / 2;
}

.page-about .about-team__figure figcaption {
  margin-top: 12px;
  font-size: var(--size-small);
  color: var(--about-text-2);
  text-align: center;
}

/* ---------- 品牌承诺 ---------- */
.page-about .about-statement {
  padding: 72px 0;
  position: relative;
  border-top: 4px solid var(--about-accent);
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 107, 44, 0.08) 0%, transparent 50%),
    linear-gradient(180deg, var(--about-bg-panel) 0%, var(--about-bg) 100%);
}

.page-about .about-statement__inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  display: grid;
  justify-items: center;
}

.page-about .about-statement__inner::before {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  background: var(--about-accent);
  margin-bottom: 20px;
  transform: skewX(-20deg);
}

.page-about .about-statement h2 {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: var(--size-h1);
  margin: 4px 0 16px;
  color: var(--about-text);
}

.page-about .about-statement__text {
  color: var(--about-text-2);
  line-height: 1.75;
  max-width: 480px;
  margin: 0;
}

.page-about .about-statement__links {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 56px 0 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 3fr 2fr;
    align-items: end;
    gap: 56px;
  }

  .page-about .about-hero__wall {
    width: 62%;
    left: auto;
    right: 0;
  }

  .page-about .about-versions__layout {
    grid-template-columns: 7fr 4fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-versions__timeline {
    padding-left: 68px;
  }

  .page-about .about-versions__timeline::before {
    left: 16px;
  }

  .page-about .version-entry__marker {
    left: 16px;
  }

  .page-about .about-data__grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px 56px;
    align-items: start;
  }

  .page-about .about-data__figure {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .about-data__quote {
    grid-column: 1;
    grid-row: 2;
  }

  .page-about .about-team__layout {
    grid-template-columns: 3fr 2fr;
    gap: 48px;
    align-items: start;
  }
}