.page-about {
  --about-index-w: 260px;
  --about-radius: 16px;
  --about-card-border: rgba(212, 175, 55, 0.22);
  background: var(--c-warm-paper);
  color: var(--c-ink);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumbs {
  padding-top: 18px;
  font-size: 13px;
  color: rgba(26, 26, 46, 0.65);
}

.page-about .breadcrumbs a {
  color: var(--c-deep-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.page-about .breadcrumbs a:hover {
  border-color: var(--c-gold);
}

.page-about .breadcrumbs-separator {
  margin: 0 8px;
  color: var(--c-gold);
}

/* Hero 区域 */
.page-about .about-hero {
  position: relative;
  padding: 48px 0 36px;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(10, 30, 63, 0.94), rgba(59, 42, 109, 0.82)),
    var(--board-pattern),
    var(--c-deep-blue);
  background-size: auto, var(--board-size), auto;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  width: 320px;
  height: 320px;
  right: -80px;
  top: -80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.25), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero-wrap {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .about-hero-top {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about .about-hero-main {
  max-width: 46em;
}

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--c-gold);
  font-size: 13px;
  letter-spacing: 0.2em;
  margin-bottom: 16px;
}

.page-about .about-hero-kicker::before {
  content: "";
  width: 32px;
  height: 2px;
  background: var(--gold-gradient);
}

.page-about .about-hero-title {
  font-family: var(--font-title);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  line-height: 1.32;
  margin: 0 0 18px;
  letter-spacing: 0.02em;
}

.page-about .about-hero-lead {
  max-width: 34em;
  margin: 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 15px;
}

.page-about .about-hero-side {
  display: none;
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  padding-top: 22px;
  border-top: 1px solid rgba(212, 175, 55, 0.3);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-hero-meta strong {
  color: var(--c-gold);
  font-size: 16px;
  font-family: var(--font-title);
  margin-right: 6px;
}

/* 主体布局 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  padding-top: 36px;
  padding-bottom: 24px;
  align-items: start;
}

.page-about .about-content {
  min-width: 0;
}

/* 侧边索引 */
.page-about .about-index {
  margin: 0 0 12px;
  font-size: 14px;
}

.page-about .about-index-inner {
  border-left: 3px solid var(--c-gold);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(8px);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
  padding: 18px 16px;
  box-shadow: var(--shadow-panel);
}

.page-about .about-index-title {
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-deep-blue);
  margin: 0 0 12px;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 8px 7px 0;
  color: var(--c-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(10, 30, 63, 0.08);
  transition: color var(--transition), padding-left var(--transition);
}

.page-about .about-index-list a span {
  color: var(--c-gold);
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 13px;
}

.page-about .about-index-list a:hover {
  color: var(--c-deep-blue);
  padding-left: 8px;
}

.page-about .about-mini-timeline {
  list-style: none;
  margin: 16px 0 0;
  padding: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  border-top: 1px dashed rgba(212, 175, 55, 0.35);
  font-size: 12px;
  color: rgba(26, 26, 46, 0.7);
}

.page-about .about-mini-timeline span {
  color: var(--c-deep-blue);
  font-weight: 700;
  margin-right: 4px;
  font-family: var(--font-title);
}

.page-about .about-index-note {
  margin: 14px 0 0;
  font-size: 12px;
  color: rgba(26, 26, 46, 0.6);
}

/* 通用章节 */
.page-about .about-section {
  padding: 32px 0;
  scroll-margin-top: 16px;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--about-card-border);
}

.page-about .about-section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .about-section-head::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.55), transparent);
}

.page-about .about-section-serial {
  font-family: var(--font-title);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-gold);
}

.page-about .about-section-title {
  font-family: var(--font-title);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  color: var(--c-deep-blue);
  margin: 0;
}

.page-about .about-section-lead {
  margin: 0 0 26px;
  max-width: 36em;
  color: rgba(26, 26, 46, 0.8);
  font-size: 15px;
}

/* 品牌缘起 */
.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-origin-copy p + p {
  margin-top: 14px;
}

.page-about .about-origin-copy a,
.page-about .about-commit-contact a {
  color: var(--c-deep-blue);
  text-decoration: none;
  border-bottom: 1px solid var(--c-gold);
  transition: color var(--transition);
}

.page-about .about-origin-copy a:hover,
.page-about .about-commit-contact a:hover {
  color: var(--c-gold);
}

.page-about .about-dropcap::first-letter {
  font-family: var(--font-title);
  font-size: 3.1em;
  float: left;
  line-height: 0.85;
  padding: 4px 8px 0 0;
  color: var(--c-gold);
  font-weight: 700;
}

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

.page-about .about-origin-figure figcaption,
.page-about .about-method-figure figcaption,
.page-about .about-commit-figure figcaption {
  font-size: 12px;
  color: rgba(26, 26, 46, 0.6);
  padding-top: 8px;
  text-align: right;
}

/* 图片承载 */
.page-about .img-frame {
  display: block;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(212, 175, 55, 0.3);
  box-shadow: var(--shadow-panel);
}

.page-about .img-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-origin-figure .img-frame {
  aspect-ratio: 2 / 1;
}

.page-about .about-method-figure .img-frame {
  aspect-ratio: 8 / 5;
}

.page-about .about-commit-figure .img-frame {
  aspect-ratio: 1 / 1;
  max-width: 300px;
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline-year-item {
  position: relative;
  padding-left: 28px;
}

.page-about .timeline-year-item + .timeline-year-item {
  margin-top: 16px;
}

.page-about .timeline-year-item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 24px;
  bottom: -16px;
  width: 1px;
  background: linear-gradient(to bottom, var(--c-gold), rgba(212, 175, 55, 0.18));
}

.page-about .timeline-year-item:last-child::before {
  display: none;
}

.page-about .timeline-marker {
  position: absolute;
  left: 1px;
  top: 18px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.22);
  z-index: 1;
  transition: box-shadow var(--transition), transform var(--transition);
}

.page-about .timeline-card {
  position: relative;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--about-card-border);
  border-radius: var(--about-radius);
  padding: 16px 18px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.page-about .timeline-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-panel);
}

.page-about .timeline-card[open] {
  border-color: rgba(212, 175, 55, 0.65);
  box-shadow: 0 10px 28px rgba(212, 175, 55, 0.16);
}

.page-about .timeline-year-item:has(details[open]) .timeline-marker {
  background: var(--c-gold);
  box-shadow: 0 0 0 6px rgba(212, 175, 55, 0.36);
  transform: scale(1.08);
}

.page-about .timeline-watermark {
  position: absolute;
  right: 10px;
  top: -12px;
  font-family: var(--font-title);
  font-size: 72px;
  font-weight: 700;
  color: rgba(10, 30, 63, 0.06);
  line-height: 1;
  pointer-events: none;
  z-index: 0;
}

.page-about .timeline-card details {
  position: relative;
  z-index: 1;
}

.page-about .timeline-card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .timeline-card summary::marker {
  content: "";
}

.page-about .timeline-year {
  font-family: var(--font-title);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-gold);
  line-height: 1;
}

.page-about .timeline-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-ink);
  transition: color var(--transition);
}

.page-about .timeline-card summary:hover .timeline-card-title {
  color: var(--c-gold);
}

.page-about .timeline-card-tag {
  display: inline-block;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 100px;
  background: rgba(90, 79, 207, 0.1);
  color: var(--c-deep-blue);
  border: 1px solid rgba(90, 79, 207, 0.16);
}

.page-about .timeline-card-icon {
  margin-left: auto;
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
  color: var(--c-gold);
  transition: transform var(--transition);
}

.page-about .timeline-card[open] .timeline-card-icon {
  transform: rotate(45deg);
}

.page-about .timeline-card-detail {
  padding-top: 14px;
  margin-top: 12px;
  border-top: 1px dashed rgba(212, 175, 55, 0.4);
  font-size: 14px;
  color: rgba(26, 26, 46, 0.85);
}

.page-about .timeline-card-detail p {
  margin: 0;
}

/* 工作方式 */
.page-about .about-method-intro {
  max-width: 40em;
  padding-bottom: 20px;
}

.page-about .about-method-intro p {
  margin: 0;
}

.page-about .about-method-figure {
  margin: 0 0 28px;
}

.page-about .about-subtitle {
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--c-deep-blue);
  margin: 0 0 14px;
}

.page-about .about-steps-list {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-steps-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.5);
  border-left: 3px solid var(--c-gold);
  border-radius: 8px;
  padding: 12px 14px;
}

.page-about .about-steps-list p {
  margin: 0;
}

.page-about .about-steps-list strong {
  display: block;
  color: var(--c-deep-blue);
  font-size: 15px;
}

.page-about .step-num {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-gold);
}

.page-about .about-method-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .stat-card {
  position: relative;
  background: var(--c-deep-blue);
  border-radius: var(--about-radius);
  padding: 18px 12px;
  text-align: center;
  color: #fff;
  overflow: hidden;
}

.page-about .stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 64px;
  height: 64px;
  border-radius: 0 0 0 100%;
  background: radial-gradient(circle, rgba(90, 79, 207, 0.55), transparent 70%);
}

.page-about .stat-value {
  display: block;
  font-family: var(--font-title);
  font-size: 26px;
  font-weight: 700;
  color: var(--c-gold);
  line-height: 1.2;
}

.page-about .stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-award-note {
  font-size: 14px;
  color: rgba(26, 26, 46, 0.7);
  padding: 14px 16px;
  border-left: 3px solid var(--c-soft-gold);
  background: rgba(212, 175, 55, 0.08);
  border-radius: 8px;
  margin: 0;
}

/* 服务承诺 */
.page-about .about-commit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-commit-secure {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.6), rgba(90, 79, 207, 0.08));
  border: 1px solid rgba(90, 79, 207, 0.2);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.page-about .about-commit-figure {
  margin: 0 0 16px;
}

.page-about .about-commit-secure > p {
  font-size: 14px;
  color: rgba(26, 26, 46, 0.82);
  margin: 0;
}

.page-about .about-commit-items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-commit-items li {
  display: flex;
  gap: 14px;
  align-items: baseline;
}

.page-about .commit-item-num {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-gold);
}

.page-about .about-commit-items p {
  margin: 0;
  font-size: 14px;
}

.page-about .about-commit-contact {
  margin-top: 24px;
  padding: 14px 16px;
  background: rgba(212, 175, 55, 0.1);
  border-left: 3px solid var(--c-gold);
  border-radius: 8px;
  font-size: 14px;
}

.page-about .about-commit-contact p {
  margin: 0;
}

/* 平板 */
@media (min-width: 768px) {
  .page-about .about-steps-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-method-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-commit-grid {
    grid-template-columns: 1fr 1.2fr;
    gap: 28px;
  }

  .page-about .about-commit-secure {
    padding: 28px;
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 72px 0 48px;
  }

  .page-about .about-hero-wrap {
    gap: 40px;
  }

  .page-about .about-hero-top {
    flex-direction: row;
    align-items: flex-end;
    gap: 48px;
  }

  .page-about .about-hero-title {
    font-size: clamp(2rem, 4vw, 3.1rem);
    line-height: 1.25;
  }

  .page-about .about-hero-side {
    display: block;
    margin-left: auto;
    padding-bottom: 28px;
  }

  .page-about .about-hero-side .note-vertical {
    writing-mode: vertical-rl;
    font-size: 12px;
    color: rgba(212, 175, 55, 0.82);
    letter-spacing: 0.3em;
    white-space: nowrap;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) 1fr;
    gap: 56px;
    padding-top: 48px;
    padding-bottom: 88px;
  }

  .page-about .about-index {
    position: sticky;
    top: 24px;
    margin: 8px 0 0;
  }

  .page-about .about-index-inner {
    padding: 22px 20px;
  }

  .page-about .about-mini-timeline {
    flex-direction: column;
    gap: 6px;
    padding-left: 4px;
  }

  .page-about .about-section {
    padding: 52px 0;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-section-head {
    margin-bottom: 28px;
  }

  .page-about .about-timeline {
    padding-right: 8px;
  }

  .page-about .timeline-card {
    padding: 20px 24px;
  }

  .page-about .timeline-card-title {
    font-size: 17px;
  }

  .page-about .about-method-intro {
    font-size: 16px;
  }

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

  .page-about .about-commit-grid {
    gap: 48px;
  }
}