.page-about {
  --about-timeline-line: #A8B2BD;
  --about-ink: #14191F;
  --about-blue: #0B3A5C;
  --about-green: #A4FF00;
  --about-paper: #F5F0E8;
  --about-paper-deep: #ECE4D8;
  --about-silver: #A8B2BD;
  --about-gray: #7A8590;
  --about-ink-panel: #1F2A33;
  font-family: var(--font-body, "Noto Sans SC", sans-serif);
  color: var(--about-ink);
  background-color: var(--about-paper);
  line-height: 1.7;
}

/* ============ 面包屑 ============ */
.page-about .breadcrumb {
  max-width: var(--max-w, 1200px);
  margin: 0 auto;
  padding: 32px 24px 0;
  font-family: var(--font-mono, monospace);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--about-gray);
}

.page-about .breadcrumb-link {
  color: var(--about-blue, #0B3A5C);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb-link:hover {
  color: var(--about-green, #A4FF00);
  background: var(--about-ink);
}

.page-about .breadcrumb-sep {
  margin: 0 8px;
  color: var(--about-silver);
}

.page-about .breadcrumb-current {
  color: var(--about-ink);
  font-weight: 700;
}

/* ============ 章节头部通用 ============ */
.page-about .section-block {
  padding: 48px 0;
}

.page-about .section-head {
  margin-bottom: 32px;
  position: relative;
  padding-left: 48px;
}

.page-about .section-head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 28px;
  height: 2px;
  background: var(--about-green);
  transform: skewX(-30deg);
}

.page-about .section-index {
  display: inline-block;
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--about-green);
  background: var(--about-ink);
  padding: 2px 8px;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.page-about .section-title {
  font-family: var(--font-body, "Noto Sans SC", sans-serif);
  font-weight: 900;
  font-size: 2.2rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
  transform: skewX(-3deg);
  color: var(--about-ink);
}

.page-about .section-sub {
  font-size: 1rem;
  color: var(--about-gray);
  margin: 0;
}

.page-about .lead-in {
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--about-ink);
  margin: 16px 0 0;
  max-width: 720px;
}

/* ============ 品牌概况引言 ============ */
.page-about__intro {
  padding: 32px 0 48px;
}

.page-about__intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}

.page-about__intro-panel {
  background: var(--about-paper-deep);
  border-left: 4px solid var(--about-green);
  padding: 28px 24px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
}

.page-about__intro-panel p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-ink);
}

.page-about__intro-panel p:last-child {
  margin-bottom: 0;
}

.page-about__intro-meta {
  background: var(--about-ink-panel);
  padding: 24px 20px;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  border-left: 2px solid var(--about-green);
}

.page-about__intro-meta .meta-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin: 0 0 12px;
  font-size: 14px;
}

.page-about__intro-meta .meta-line:last-child {
  margin-bottom: 0;
}

.page-about__intro-meta .meta-label {
  color: var(--about-silver);
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about__intro-meta .meta-value {
  color: var(--about-paper);
  font-weight: 700;
}

/* ============ 时间线 ============ */
.page-about__timeline {
  position: relative;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 280px;
  width: 2px;
  background: linear-gradient(to bottom, var(--about-green) 0%, var(--about-silver) 45%, var(--about-silver) 100%);
}

.page-about__timeline-wrap {
  position: relative;
  padding-left: 60px;
}

.page-about__milestone {
  position: relative;
  margin-bottom: 40px;
}

.page-about__milestone:last-child {
  margin-bottom: 0;
}

.page-about__milestone-node {
  position: absolute;
  left: -60px;
  top: 12px;
  width: 48px;
  z-index: 2;
}

.page-about__milestone-ver {
  display: inline-block;
  background: var(--about-ink);
  color: var(--about-green);
  font-family: var(--font-mono, monospace);
  font-weight: 700;
  font-size: 14px;
  padding: 4px 8px;
  transform: skewX(-12deg);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  white-space: nowrap;
}

.page-about__milestone-year {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  color: var(--about-gray);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 20px;
  width: 10px;
  height: 10px;
  background: var(--about-paper);
  border: 2px solid var(--about-green);
  transform: rotate(45deg);
  z-index: 1;
}

.page-about__milestone-card {
  background: var(--about-paper-deep);
  padding: 24px 20px;
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
  transition: background 0.25s ease;
}

.page-about__milestone-card:hover {
  background: #F0E9DE;
}

.page-about__milestone-card h3 {
  font-size: 1.25rem;
  font-weight: 900;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}

.page-about__milestone-card p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-ink);
  margin: 0 0 14px;
}

.page-about__milestone-card.cut-panel-dark {
  background: var(--about-ink-panel);
  transition: background 0.25s ease;
}

.page-about__milestone-card.cut-panel-dark:hover {
  background: #26333E;
}

.page-about__milestone-card.cut-panel-dark h3 {
  color: var(--about-paper);
}

.page-about__milestone-card.cut-panel-dark p {
  color: var(--about-silver);
}

.page-about__milestone-card.cut-panel-dark .arrow-link {
  display: inline-block;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--about-green);
  text-decoration: none;
  border-bottom: 1px solid var(--about-green);
  padding-bottom: 2px;
}

.page-about__milestone-card.cut-panel-dark .arrow-link:hover {
  color: var(--about-ink);
  background: var(--about-green);
}

/* 时间线配图 */
.page-about__timeline-figure {
  margin: 40px 0 0 60px;
  background: var(--about-ink-panel);
  padding: 12px;
}

.page-about__timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__timeline-figure .media-hint {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  color: var(--about-silver);
  letter-spacing: 0.04em;
}

/* ============ 数据能力 ============ */
.page-about__data {
  background: linear-gradient(180deg, var(--about-paper) 0%, #F0EBE2 100%);
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.page-about__stats .data-card {
  background: var(--about-paper);
  border: 1px solid var(--about-silver);
  padding: 20px 16px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about__stats .data-card:hover {
  border-color: var(--about-green);
  background: #FAF6EF;
}

.page-about__stats .data-index {
  display: block;
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  color: var(--about-gray);
  margin-bottom: 8px;
}

.page-about__stats .data-label {
  display: block;
  font-size: 13px;
  color: var(--about-gray);
  margin-bottom: 4px;
  font-weight: 500;
}

.page-about__stats .data-value {
  display: block;
  font-family: var(--font-body, "Noto Sans SC", sans-serif);
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.2;
  color: var(--about-ink);
  margin-bottom: 4px;
  letter-spacing: -0.03em;
  transform: skewX(-3deg);
}

.page-about__stats .data-note {
  display: block;
  font-size: 12px;
  color: var(--about-gray);
  font-family: var(--font-mono, monospace);
}

/* 地图配图 */
.page-about__data-map {
  margin: 0 0 40px;
}

.page-about__data-map img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-silver);
}

.page-about__data-map .media-hint {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  color: var(--about-gray);
  padding-left: 16px;
  position: relative;
}

.page-about__data-map .media-hint::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--about-green);
  transform: rotate(45deg);
}

/* 数据管道 */
.page-about__pipeline {
  background: var(--about-blue);
  padding: 32px 24px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 20px) 100%, 0 100%);
  margin-bottom: 24px;
}

.page-about__pipeline-title {
  color: var(--about-paper);
  font-size: 1.3rem;
  font-weight: 900;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
  transform: skewX(-2deg);
}

.page-about__pipeline-flow {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about__pipeline-flow .pipeline-step {
  background: var(--about-paper);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  transition: transform 0.2s ease;
}

.page-about__pipeline-flow .pipeline-step:hover {
  transform: translateX(4px);
}

.page-about__pipeline-flow .pipeline-step-index {
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  font-weight: 700;
  color: var(--about-blue);
  background: var(--about-green);
  padding: 2px 6px;
}

.page-about__pipeline-flow .pipeline-step-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--about-ink);
  margin: 0;
}

.page-about__pipeline-flow .pipeline-arrow {
  color: var(--about-green);
  font-size: 20px;
  font-family: var(--font-mono, monospace);
  padding-left: 8px;
}

.page-about__pipeline-note {
  color: var(--about-paper);
  font-size: 14px;
  line-height: 1.8;
  margin: 20px 0 0;
  opacity: 0.9;
  border-left: 3px solid var(--about-green);
  padding-left: 12px;
}

/* 管道配图 */
.page-about__pipeline-figure {
  margin: 24px 0 0;
}

.page-about__pipeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-silver);
}

.page-about__pipeline-figure .media-hint {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  color: var(--about-gray);
}

/* ============ 组织与生态 ============ */
.page-about__org {
  background: var(--about-paper);
}

.page-about__org-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 32px;
}

.page-about__org-panel {
  padding: 28px 24px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
}

.page-about__org-panel h3 {
  font-size: 1.2rem;
  font-weight: 900;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.page-about__org-panel p {
  font-size: 0.95rem;
  line-height: 1.85;
  margin: 0 0 16px;
}

.page-about__org-panel p:last-child {
  margin-bottom: 0;
}

.page-about__org-panel.cut-panel-dark {
  background: var(--about-ink-panel);
}

.page-about__org-panel.cut-panel-dark h3 {
  color: var(--about-paper);
}

.page-about__org-panel.cut-panel-dark p {
  color: var(--about-silver);
}

.page-about__org-panel.cut-panel-dark .meta-label {
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  color: var(--about-green);
  display: block;
  margin-bottom: 4px;
}

.page-about__org-panel.cut-panel-dark .meta-value {
  color: var(--about-paper);
  font-weight: 700;
}

.page-about__org-panel:not(.cut-panel-dark) {
  background: var(--about-paper-deep);
}

.page-about__org-panel .tag-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about__org-panel .tag {
  display: inline-block;
  font-size: 12px;
  padding: 4px 10px;
  font-family: var(--font-mono, monospace);
  letter-spacing: 0.03em;
}

/* 认证 */
.page-about__certification {
  background: var(--about-paper-deep);
  padding: 28px 24px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about__certification .certification-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(168, 178, 189, 0.5);
}

.page-about__certification .certification-item:last-child {
  border-bottom: none;
}

.page-about__certification .certification-index {
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  color: var(--about-gray);
  letter-spacing: 0.08em;
}

.page-about__certification .certification-name {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--about-ink);
  margin: 0;
}

.page-about__certification .certification-desc {
  font-size: 0.9rem;
  color: var(--about-gray);
  margin: 0;
  line-height: 1.7;
}

/* ============ 信任声明 ============ */
.page-about .trust-strip {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--about-ink);
  padding: 24px;
  margin: 0 0 48px;
  clip-path: polygon(16px 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
}

.page-about .trust-strip .trust-index {
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  color: var(--about-ink);
  background: var(--about-green);
  padding: 2px 8px;
  white-space: nowrap;
}

.page-about .trust-strip p {
  color: var(--about-paper);
  font-size: 14px;
  line-height: 1.8;
  margin: 0;
}

/* ============ 底部导航 ============ */
.page-about__bottom-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 0 0 48px;
}

.page-about__bottom-nav .btn {
  text-decoration: none;
  font-weight: 700;
  padding: 12px 24px;
  font-size: 15px;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-about__bottom-nav .btn-primary {
  background: var(--about-green);
  color: var(--about-ink);
  border: 2px solid var(--about-green);
}

.page-about__bottom-nav .btn-primary:hover {
  background: var(--about-ink);
  color: var(--about-green);
}

.page-about__bottom-nav .btn-ghost {
  background: transparent;
  color: var(--about-ink);
  border: 2px solid var(--about-ink);
}

.page-about__bottom-nav .btn-ghost:hover {
  background: var(--about-ink);
  color: var(--about-paper);
  border-color: var(--about-ink);
}

/* ============ 通用 ============ */
.page-about .container {
  max-width: var(--max-w, 1200px);
  margin: 0 auto;
  padding: 0 24px;
}

.page-about .rule {
  border: none;
  border-top: 1px solid var(--about-silver);
  max-width: var(--max-w, 1200px);
  margin: 0 auto;
}

.page-about .grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.page-about .asym-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .tag {
  display: inline-block;
  font-size: 12px;
  padding: 4px 10px;
  margin: 0 6px 6px 0;
  font-family: var(--font-mono, monospace);
}

.page-about .tag-blue {
  background: var(--about-blue);
  color: var(--about-paper);
}

.page-about .tag-green {
  background: var(--about-green);
  color: var(--about-ink);
  font-weight: 700;
}

.page-about .tag-paper {
  background: var(--about-paper);
  color: var(--about-ink);
  border: 1px solid var(--about-silver);
}

.page-about .media-frame {
  background: var(--about-ink-panel);
  padding: 10px;
}

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

/* ============ 响应式：平板及以上 ============ */
@media (min-width: 768px) {
  .page-about .section-block {
    padding: 64px 0;
  }

  .page-about .section-title {
    font-size: 2.8rem;
  }

  .page-about__intro-grid {
    grid-template-columns: 1.4fr 0.6fr;
    align-items: stretch;
  }

  .page-about__intro-meta {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about__timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about__timeline-wrap {
    padding-left: 0;
  }

  .page-about__milestone {
    width: 50%;
    padding-right: 48px;
  }

  .page-about__milestone:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 48px;
  }

  .page-about__milestone:nth-child(odd) {
    margin-right: 50%;
  }

  .page-about__milestone:nth-child(odd) .page-about__milestone-node {
    left: auto;
    right: -24px;
    text-align: left;
  }

  .page-about__milestone:nth-child(even) .page-about__milestone-node {
    left: -24px;
    text-align: right;
  }

  .page-about__milestone::before {
    left: auto;
    right: -6px;
  }

  .page-about__milestone:nth-child(even)::before {
    left: -6px;
    right: auto;
  }

  .page-about__timeline-figure {
    margin: 48px 80px 0;
  }

  .page-about__stats .data-card {
    padding: 24px 20px;
  }

  .page-about__stats .data-value {
    font-size: 3rem;
  }

  .page-about__pipeline-flow {
    flex-direction: row;
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .page-about__pipeline-flow .pipeline-step {
    flex: 1;
    min-width: 180px;
  }

  .page-about__pipeline-flow .pipeline-arrow {
    align-self: center;
    font-size: 24px;
  }

  .page-about__org-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__certification .certification-item {
    grid-template-columns: 90px 1fr;
    gap: 8px 20px;
  }

  .page-about__certification .certification-index {
    grid-row: span 2;
    display: flex;
    align-items: flex-start;
    padding-top: 4px;
  }

  .page-about .trust-strip {
    padding: 28px 32px;
  }

  .page-about__bottom-nav {
    gap: 16px;
  }

  .page-about .grid-4 {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
}