/* ===== 关于页专属样式 ===== */
.page-about {
  --about-accent-soft: rgba(57, 255, 20, 0.1);
  --about-gold-glow: 0 0 0 1px rgba(255, 215, 0, 0.45), 0 0 18px rgba(255, 215, 0, 0.22);
  --about-line: repeating-linear-gradient(-45deg, rgba(255, 255, 255, 0.03) 0 1px, transparent 1px 14px);
  overflow-x: clip;
}

.page-about .content-container {
  width: min(var(--container-w), 100% - 32px);
  margin-inline: auto;
}

.page-about .grid-bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
}

.page-about .grid-bento > [class*="col-span-"] {
  grid-column: span 12;
}

@media (min-width: 720px) {
  .page-about .grid-bento > .col-span-4 { grid-column: span 4; }
  .page-about .grid-bento > .col-span-5 { grid-column: span 5; }
  .page-about .grid-bento > .col-span-6 { grid-column: span 6; }
  .page-about .grid-bento > .col-span-7 { grid-column: span 7; }
}

/* ---- 面包屑 ---- */
.page-about .breadcrumb {
  padding: 18px 0 0;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--color-text-dim);
}

.page-about .breadcrumb ol li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-border);
}

.page-about .breadcrumb a {
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color var(--fast) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--color-accent);
}

/* ---- Hero ---- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(24px, 5vw, 48px);
  border-bottom: 1px solid var(--color-border);
  background:
    linear-gradient(135deg, rgba(57, 255, 20, 0.08) 0%, transparent 55%),
    var(--about-line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  padding: clamp(24px, 5vw, 56px) 0 0;
}

@media (min-width: 800px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
  }
}

.page-about .about-hero__tag {
  margin-bottom: 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.02;
  margin: 0 0 16px;
  letter-spacing: 0.01em;
}

.page-about .about-hero__lead {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text-dim);
  max-width: 44rem;
  margin: 0 0 24px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---- 本页导航预览 ---- */
.page-about .about-preview {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: 20px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.page-about .about-preview__title {
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 14px;
}

.page-about .about-preview ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-preview a {
  display: block;
  padding: 8px 10px 8px 0;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
  border-bottom: 1px dashed var(--color-border);
  transition: color var(--fast) var(--ease), padding-left var(--fast) var(--ease);
}

.page-about .about-preview li:last-child a {
  border-bottom: 0;
}

.page-about .about-preview a:hover,
.page-about .about-preview a:focus-visible {
  color: var(--color-accent);
  padding-left: 8px;
}

/* ---- 核心数据条 ---- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  margin-top: 32px;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about .about-stat {
  display: grid;
  gap: 6px;
  padding: 18px 14px;
  background: var(--color-bg-card);
}

.page-about .about-stat .data-stat {
  font-family: var(--font-data);
  font-size: 1.8rem;
  color: var(--color-accent);
  line-height: 1;
}

.page-about .about-stat span:last-child {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  letter-spacing: 0.05em;
}

/* ---- 区块标题 ---- */
.page-about .section {
  padding: clamp(32px, 6vw, 72px) 0;
}

.page-about .section-compact {
  padding: 24px 0 64px;
}

.page-about .section-heading {
  margin-bottom: 32px;
}

.page-about .section-heading h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.15;
  margin: 6px 0 10px;
}

.page-about .section-desc {
  color: var(--color-text-dim);
  line-height: 1.7;
  max-width: 52ch;
  margin: 0;
}

/* ---- 品牌故事 ---- */
.page-about .about-story__copy {
  padding: clamp(22px, 4vw, 36px);
  border-left: 3px solid var(--color-accent);
}

.page-about .about-story__copy p {
  line-height: 1.75;
  color: var(--color-text-dim);
  margin: 0 0 14px;
}

.page-about .about-story__media {
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-about .media-frame {
  background: var(--color-bg-card);
}

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

/* ---- 发展历程时间轴 ---- */
.page-about .about-timeline-section {
  background:
    linear-gradient(180deg, transparent 0%, rgba(21, 27, 58, 0.6) 10%, rgba(21, 27, 58, 0.6) 90%, transparent 100%),
    var(--about-line);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 8px 0 0;
  position: relative;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-accent-fire), var(--color-gold));
  opacity: 0.7;
}

@media (min-width: 860px) {
  .page-about .timeline-list::before {
    left: 50%;
    transform: translateX(-50%);
  }
}

.page-about .timeline-item {
  position: relative;
  margin: 0 0 24px;
  padding-left: 48px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 24px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 3px solid var(--color-accent);
  box-shadow: 0 0 0 4px rgba(57, 255, 20, 0.15);
}

@media (min-width: 860px) {
  .page-about .timeline-item {
    width: calc(50% - 44px);
    padding-left: 0;
  }

  .page-about .timeline-item:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .timeline-item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .timeline-item::before {
    left: auto;
    right: -42px;
  }

  .page-about .timeline-item:nth-child(even)::before {
    right: auto;
    left: -42px;
  }
}

.page-about .timeline-card {
  padding: 22px 20px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  transition: border-color var(--med) var(--ease), box-shadow var(--med) var(--ease);
}

.page-about .timeline-card:hover,
.page-about .timeline-card:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px rgba(57, 255, 20, 0.25), 0 8px 24px rgba(0, 0, 0, 0.3);
}

.page-about .timeline-item--v4 .timeline-card {
  border-color: rgba(255, 77, 0, 0.6);
  background: linear-gradient(135deg, rgba(255, 77, 0, 0.08), var(--color-bg-card) 60%);
}

.page-about .timeline-version {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.page-about .timeline-item--v4 .timeline-version {
  color: var(--color-accent-fire);
}

.page-about .timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  margin: 0 0 8px;
  line-height: 1.25;
}

.page-about .timeline-card p {
  margin: 0;
  color: var(--color-text-dim);
  line-height: 1.65;
  font-size: 0.95rem;
}

/* ---- 资质与认证 ---- */
.page-about .about-credentials {
  background: radial-gradient(ellipse 70% 60% at 70% 0%, rgba(255, 215, 0, 0.07), transparent 60%);
}

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

.page-about .credential-card {
  margin: 0;
  padding: 22px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--med) var(--ease), box-shadow var(--med) var(--ease);
}

.page-about .credential-card:hover,
.page-about .credential-card:focus-within {
  border-color: var(--color-gold);
  box-shadow: var(--about-gold-glow);
}

.page-about .credential-summary {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: center;
  list-style: none;
  cursor: pointer;
}

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

.page-about .credential-badge {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  background: var(--color-gold);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-size: 1rem;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.page-about .credential-badge--iso {
  font-size: 0.72rem;
}

.page-about .credential-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin: 0;
  line-height: 1.3;
}

.page-about .credential-card[open] .credential-summary {
  margin-bottom: 14px;
}

.page-about .credential-body {
  border-top: 1px dashed var(--color-border);
  padding-top: 12px;
  color: var(--color-text-dim);
  line-height: 1.7;
  font-size: 0.95rem;
}

.page-about .credential-card[open] .credential-body p {
  margin: 0;
}

.page-about .credential-note {
  margin-top: 20px;
  padding: 16px 20px;
  border: 1px dashed var(--color-gold);
  background: rgba(255, 215, 0, 0.04);
  color: var(--color-text);
  line-height: 1.7;
}

.page-about .credential-note p {
  margin: 0;
}

/* ---- 团队与协作 ---- */
.page-about .about-team__copy {
  padding: 24px 0;
}

.page-about .about-team__copy .section-tag {
  margin-bottom: 10px;
}

.page-about .about-team__copy h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.15;
  margin: 6px 0 10px;
}

.page-about .about-team__copy p {
  color: var(--color-text-dim);
  line-height: 1.75;
  margin: 0 0 14px;
}

.page-about .team-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 24px 0 0;
}

.page-about .team-fact {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: 16px 12px;
  display: grid;
  gap: 6px;
}

.page-about .team-fact dt {
  font-size: 1.5rem;
  color: var(--color-accent);
  font-family: var(--font-data);
  line-height: 1;
}

.page-about .team-fact dd {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-text-dim);
  line-height: 1.4;
}

.page-about .about-team__media {
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

/* ---- 数据服务承诺 ---- */
.page-about .about-data {
  background: linear-gradient(135deg, rgba(57, 255, 20, 0.06), transparent 60%);
}

.page-about .about-data__content {
  padding: 24px 0;
}

.page-about .about-data__content .section-tag {
  margin-bottom: 10px;
}

.page-about .about-data__content h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.15;
  margin: 6px 0 10px;
}

.page-about .about-data__content p {
  color: var(--color-text-dim);
  line-height: 1.75;
  margin: 0 0 14px;
}

.page-about .about-data__content .btn {
  margin-top: 8px;
}

.page-about .about-data__media {
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

/* ---- 底部CTA ---- */
.page-about .about-cta__inner {
  text-align: center;
  padding: clamp(28px, 5vw, 48px);
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  clip-path: var(--clip-notch);
}

.page-about .about-cta h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0 0 10px;
}

.page-about .about-cta p {
  color: var(--color-text-dim);
  margin: 0 auto 22px;
  max-width: 42ch;
  line-height: 1.7;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* ---- 焦点反馈 ---- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}