/* ===== 品牌概况页 .page-about ===== */
.page-about {
  --about-gutter: clamp(1.25rem, 5vw, 4rem);
  --about-note-w: 230px;
  background: var(--color-content);
  color: var(--color-text);
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: .5rem;
  max-width: var(--container);
  margin: 0 auto;
  padding: 1rem var(--about-gutter);
  font-family: var(--font-sans);
  font-size: .8125rem;
  color: var(--color-muted);
}
.page-about .breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  color: var(--color-accent);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-text);
  font-weight: 600;
}

/* ---------- 页首横幅 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-primary-deep);
  color: var(--color-paper);
}
.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .38;
}
.page-about .about-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(20,42,34,.95) 0%, rgba(20,42,34,.8) 48%, rgba(20,42,34,.32) 100%);
}
.page-about .about-hero-content {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 6rem) var(--about-gutter) clamp(2.5rem, 6vw, 4.5rem);
}
.page-about .about-hero-kicker {
  margin: 0 0 1.25rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.page-about .about-hero-title {
  margin: 0 0 1.5rem;
  font-family: var(--font-serif);
  line-height: 1.12;
  letter-spacing: .02em;
}
.page-about .about-hero-title-main {
  display: block;
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 700;
}
.page-about .about-hero-title-sub {
  display: block;
  margin-top: .5rem;
  font-size: clamp(1rem, 2.4vw, 1.5rem);
  font-weight: 500;
  color: var(--color-accent);
}
.page-about .about-hero-abstract {
  max-width: 44rem;
  margin: 0 0 1.5rem;
  font-family: var(--font-sans);
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.8;
  color: rgba(253,249,242,.9);
}
.page-about .about-hero-meta {
  display: inline-flex;
  flex-wrap: wrap;
  gap: .4rem .6rem;
  padding: .5rem .875rem;
  border: 1px solid rgba(201,160,99,.4);
  background: rgba(201,160,99,.1);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--color-accent);
}

/* ---------- 区块通用 ---------- */
.page-about .about-intro,
.page-about .about-compliance {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 6rem) var(--about-gutter);
}

/* ---------- 我们是谁 ---------- */
.page-about .about-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
}
.page-about .about-intro-note {
  padding-left: 1.25rem;
  border-left: 2px solid var(--color-accent);
  font-family: var(--font-sans);
  font-size: .875rem;
  line-height: 1.75;
  color: var(--color-muted);
}
.page-about .about-intro-note p {
  margin: .5rem 0;
}
.page-about .about-intro-note .section-label {
  margin-bottom: .75rem;
}
.page-about .about-intro-note-link a {
  color: var(--color-accent);
  text-decoration: none;
}
.page-about .about-intro-note-link a:hover {
  text-decoration: underline;
}
.page-about .about-intro-main h2,
.page-about .about-timeline-head h2,
.page-about .about-commitment h2,
.page-about .about-compliance-main h2 {
  margin: .5rem 0 1.25rem;
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  line-height: 1.25;
  letter-spacing: .01em;
}
.page-about .about-intro-lede {
  margin-bottom: 1rem;
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  line-height: 1.8;
  color: var(--color-text);
}
.page-about .about-intro-main > p:not(.about-intro-lede) {
  margin: 0 0 1.5rem;
  font-family: var(--font-sans);
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--color-muted);
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 2rem;
  border: 1px solid var(--color-border);
  background: var(--color-border);
  box-shadow: var(--shadow-sm);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1.35rem 1.1rem;
  background: var(--color-paper);
}
.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 500;
  letter-spacing: -.03em;
  color: var(--color-primary);
}
.page-about .about-stat-label {
  font-family: var(--font-sans);
  font-size: .8125rem;
  color: var(--color-muted);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  max-width: none;
  padding: clamp(3.5rem, 8vw, 6rem) var(--about-gutter);
  background: var(--color-paper);
}
.page-about .about-timeline-head {
  max-width: var(--container);
  margin: 0 auto clamp(2.5rem, 6vw, 4rem);
}
.page-about .about-timeline-lead {
  max-width: 42rem;
  margin: 0;
  font-family: var(--font-sans);
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--color-muted);
}
.page-about .about-timeline-lead a {
  color: var(--color-primary);
}
.page-about .about-timeline-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
  max-width: var(--container);
  margin: 0 auto;
}
.page-about .about-timeline-list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  top: .6rem;
  bottom: .6rem;
  left: 13px;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
}
.page-about .about-timeline-item {
  position: relative;
  margin: 0;
  padding: 0 0 1.75rem 3rem;
}
.page-about .about-timeline-item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  top: .4rem;
  left: 8px;
  width: 11px;
  height: 11px;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  background: var(--color-paper);
}
.page-about .about-timeline-item details > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .75rem;
  padding: .2rem 0;
  cursor: pointer;
  list-style: none;
  font-size: inherit;
}
.page-about .about-timeline-item details > summary::-webkit-details-marker {
  display: none;
}
.page-about .about-timeline-item details > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: .875rem;
  color: var(--color-accent);
}
.page-about .about-timeline-item details[open] > summary::after {
  content: "–";
  color: var(--color-primary);
}
.page-about .about-timeline-item details > summary:hover .about-tl-title {
  color: var(--color-accent);
}
.page-about .about-timeline-item details > summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 2px;
}
.page-about .about-tl-year {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .05em;
  color: var(--color-accent);
}
.page-about .about-tl-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
}
.page-about .about-timeline-item details p {
  max-width: 52ch;
  margin: .6rem 0 0;
  font-family: var(--font-sans);
  font-size: .875rem;
  line-height: 1.8;
  color: var(--color-muted);
}
.page-about .about-timeline-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}
.page-about .about-timeline-caption {
  margin: .75rem 0 0;
  font-family: var(--font-sans);
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--color-muted);
}

/* ---------- 数据承诺 ---------- */
.page-about .about-commitment {
  max-width: none;
  padding: clamp(3.5rem, 8vw, 6rem) var(--about-gutter);
  background: var(--color-primary);
  color: var(--color-paper);
}
.page-about .about-commitment-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  max-width: var(--container);
  margin: 0 auto;
}
.page-about .about-commitment .section-label {
  color: var(--color-accent);
}
.page-about .about-commitment-copy > p {
  margin: 0 0 1rem;
  font-family: var(--font-sans);
  line-height: 1.85;
  color: rgba(253,249,242,.88);
}
.page-about .about-commitment-list {
  margin: 1.75rem 0 2rem;
  padding: 0;
  list-style: none;
}
.page-about .about-commitment-list li {
  position: relative;
  padding: .85rem 0 .85rem 2.25rem;
  border-bottom: 1px solid rgba(201,160,99,.22);
  font-family: var(--font-sans);
  font-size: .875rem;
  line-height: 1.7;
}
.page-about .about-commitment-list li:first-child {
  border-top: 1px solid rgba(201,160,99,.22);
}
.page-about .about-commitment-list li::before {
  content: "";
  position: absolute;
  top: 1.1rem;
  left: 0;
  width: 12px;
  height: 1px;
  background: var(--color-accent);
}
.page-about .about-commitment-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.page-about .about-commitment .btn-ghost {
  border-color: rgba(253,249,242,.5);
  color: var(--color-paper);
}
.page-about .about-commitment-figure {
  margin: 0;
}
.page-about .about-commitment-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid rgba(253,249,242,.15);
  box-shadow: var(--shadow-lg);
}
.page-about .about-commitment-figure figcaption {
  margin-top: .75rem;
  font-family: var(--font-sans);
  font-size: .8125rem;
  line-height: 1.7;
  color: rgba(253,249,242,.7);
}

/* ---------- 资质与备案 ---------- */
.page-about .about-compliance-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
}
.page-about .about-compliance-main p {
  margin: 0 0 1.25rem;
  font-family: var(--font-sans);
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--color-muted);
}
.page-about .about-compliance-main a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.page-about .about-compliance-panel {
  padding: 2rem 1.75rem;
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}
.page-about .about-compliance-panel h3 {
  margin: 0 0 1.25rem;
  padding-bottom: .85rem;
  border-bottom: 2px solid var(--color-accent);
  font-family: var(--font-serif);
  font-size: 1.3rem;
  letter-spacing: .02em;
}
.page-about .about-compliance-dl {
  margin: 0 0 1.5rem;
}
.page-about .about-dl-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .8rem 0;
  border-bottom: 1px solid rgba(74,90,90,.18);
  font-family: var(--font-sans);
  font-size: .875rem;
}
.page-about .about-dl-row dt {
  color: var(--color-muted);
}
.page-about .about-dl-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--color-text);
  text-align: right;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-intro-grid {
    grid-template-columns: var(--about-note-w) minmax(0, 1fr);
    gap: clamp(2rem, 6vw, 5rem);
  }
  .page-about .about-timeline-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(2rem, 5vw, 5rem);
  }
  .page-about .about-commitment-inner {
    grid-template-columns: minmax(0, 1fr) minmax(280px, .85fr);
    gap: clamp(2rem, 6vw, 5rem);
    align-items: center;
  }
  .page-about .about-compliance-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: clamp(2rem, 6vw, 5rem);
  }
}