/* ===== 品牌概况页专属样式 ===== */
.page-about {
  position: relative;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  padding-top: 28px;
  padding-bottom: 4px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

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

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

/* 封面区 */
.page-about .about-hero {
  position: relative;
  padding: 40px 16px 56px;
  background:
    linear-gradient(rgba(42,74,107,0.4) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(90deg, rgba(42,74,107,0.4) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(150deg, var(--grad-start) 0%, var(--bg-secondary) 55%, var(--bg-primary) 100%);
  border-bottom: 3px solid var(--accent);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 220px;
  height: 220px;
  background: linear-gradient(135deg, rgba(255,107,53,0.22), transparent 70%);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "GRID / 01 ABOUT";
  position: absolute;
  right: 14px;
  bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(176,196,222,0.35);
  pointer-events: none;
}

.page-about .about-hero-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--accent);
  border: 1px solid rgba(255,107,53,0.6);
  background: rgba(255,107,53,0.08);
}

.page-about .about-hero-kicker::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--accent);
}

.page-about .about-hero-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.15;
  margin: 24px 0 16px;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.page-about .about-hero-title span {
  display: block;
  font-size: clamp(16px, 2.2vw, 24px);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-top: 6px;
}

.page-about .about-hero-desc {
  max-width: 640px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
}

.page-about .about-hero-data {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-secondary);
}

.page-about .about-hero-data strong {
  color: var(--accent);
  font-weight: 700;
  font-size: 16px;
  margin-right: 4px;
}

.page-about .about-hero-anchor {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 4px;
  transition: color var(--ease);
}

.page-about .about-hero-anchor:hover {
  color: var(--accent);
}

/* 通用章节 */
.page-about .about-section {
  padding: 48px 0 64px;
}

.page-about .about-section--alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
}

.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 36px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .about-section-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 36px;
  flex: 0 0 52px;
  background: var(--accent);
  color: var(--bg-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-section-title-group {
  flex: 1;
}

.page-about .about-section-title {
  font-family: var(--font-head);
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-primary);
  position: relative;
  padding-left: 18px;
  margin: 0;
}

.page-about .about-section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  width: 8px;
  height: 0.7em;
  background: var(--accent);
}

.page-about .about-section-sub {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--text-secondary);
}

/* 品牌定位 */
.page-about .about-position-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-position-main {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-position-lead {
  font-size: 18px;
  line-height: 1.8;
  border-left: 4px solid var(--accent);
  padding-left: 16px;
  max-width: 760px;
  margin: 0;
}

.page-about .about-position-lead strong {
  color: var(--accent);
}

.page-about .about-position-copy {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0;
}

.page-about .about-figure {
  margin: 8px 0 0;
  border: 1px solid var(--grid-line);
  background: var(--bg-surface);
}

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

.page-about .about-figure-cap {
  padding: 10px 12px;
  font-size: 12px;
  color: var(--text-secondary);
  border-top: 1px solid var(--grid-line);
  letter-spacing: 0.04em;
  margin: 0;
}

.page-about .about-side-panel {
  display: grid;
  align-content: start;
  gap: 20px;
}

.page-about .about-panel-card {
  background: var(--bg-surface);
  border: 1px solid var(--grid-line);
  padding: 20px;
  position: relative;
}

.page-about .about-panel-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent 70%);
}

.page-about .about-panel-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
  margin: 0 0 8px;
}

.page-about .about-panel-mission {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-primary);
  margin: 0;
}

.page-about .about-panel-stats {
  list-style: none;
  padding: 0;
  margin: 0;
  border: 1px solid var(--grid-line);
  background: var(--bg-surface);
}

.page-about .about-panel-stat {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 12px;
  row-gap: 2px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .about-panel-stat:last-child {
  border-bottom: none;
}

.page-about .about-panel-num {
  grid-row: 1 / 3;
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
}

.page-about .about-panel-unit {
  font-size: 12px;
  color: var(--text-primary);
  font-weight: 700;
}

.page-about .about-panel-desc {
  font-size: 12px;
  color: var(--text-secondary);
}

/* 数据能力 */
.page-about .about-capability-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-pipeline {
  border: 1px solid var(--grid-line);
  background: var(--bg-surface);
  padding: 24px;
  position: relative;
}

.page-about .about-pipeline::after {
  content: "DATA / 02";
  position: absolute;
  top: 10px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(176,196,222,0.4);
  letter-spacing: 0.1em;
}

.page-about .about-block-title {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  margin: 0 0 18px;
  color: var(--text-primary);
}

.page-about .about-pipeline-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: pipeline;
}

.page-about .about-pipeline-step {
  counter-increment: pipeline;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--grid-line);
}

.page-about .about-pipeline-step:last-child {
  border-bottom: none;
}

.page-about .about-pipeline-step::before {
  content: "0" counter(pipeline);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 28px;
  background: var(--bg-primary);
  border: 1px solid var(--grid-line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
}

.page-about .about-pipeline-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.page-about .about-pipeline-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .about-pipeline-note {
  margin: 18px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--accent);
  background: var(--bg-primary);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .about-capability-right {
  display: grid;
  gap: 24px;
  align-content: start;
}

.page-about .about-figure--compact {
  background: var(--bg-surface);
  border: 1px solid var(--grid-line);
}

.page-about .about-capability-bars {
  display: grid;
  gap: 12px;
}

.page-about .about-bar-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.page-about .about-bar-label {
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  transition: color var(--ease);
}

.page-about .about-bar-track {
  height: 30px;
  background: var(--bg-surface);
  border: 1px solid var(--grid-line);
  padding: 2px;
  box-sizing: border-box;
}

.page-about .about-bar-fill {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  padding-right: 8px;
  box-sizing: border-box;
  background: linear-gradient(90deg, rgba(255,107,53,0.15), rgba(255,107,53,0.45));
  border-right: 3px solid var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-primary);
  white-space: nowrap;
  transition: background var(--ease);
}

.page-about .about-bar-row:hover .about-bar-fill {
  background: linear-gradient(90deg, rgba(255,107,53,0.35), rgba(255,107,53,0.7));
}

.page-about .about-bar-row:hover .about-bar-label {
  color: var(--text-primary);
}

/* 发展历程 */
.page-about .about-timeline {
  position: relative;
  margin-left: 12px;
  border-left: 1px solid var(--grid-line);
  padding-left: 28px;
  display: grid;
  gap: 24px;
}

.page-about .about-timeline-item {
  position: relative;
  border: 1px solid var(--grid-line);
  background: var(--bg-surface);
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 22px;
  width: 10px;
  height: 10px;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--bg-primary);
}

.page-about .about-timeline-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 18px 20px;
  margin: 0;
  transition: background var(--ease);
}

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

.page-about .about-timeline-summary:hover {
  background: rgba(255,107,53,0.06);
}

.page-about .about-timeline-phase {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
}

.page-about .about-timeline-desc {
  flex-basis: 100%;
  font-size: 13px;
  color: var(--text-secondary);
}

.page-about .about-timeline-toggle {
  margin-left: auto;
  font-size: 18px;
  color: var(--accent);
  flex-basis: auto;
}

.page-about .about-timeline-item:not([open]) .about-timeline-toggle::before {
  content: "+";
}

.page-about .about-timeline-item[open] .about-timeline-toggle::before {
  content: "−";
}

.page-about .about-timeline-body {
  padding: 0 20px 18px;
  border-top: 1px solid var(--grid-line);
  margin-top: 4px;
}

.page-about .about-timeline-body p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* 资质荣誉 */
.page-about .about-credential-grid {
  display: grid;
  gap: 16px;
  margin-bottom: 24px;
}

.page-about .about-credential-card {
  background: var(--bg-surface);
  border: 1px solid var(--grid-line);
  padding: 22px 20px;
  position: relative;
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .about-credential-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.page-about .about-credential-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 1px solid var(--grid-line);
  padding: 3px 6px;
  margin-bottom: 14px;
}

.page-about .about-credential-title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 10px;
  color: var(--text-primary);
}

.page-about .about-credential-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin: 0;
}

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

.page-about .about-credential-emblem {
  margin: 0;
  border: 1px solid var(--grid-line);
  background: var(--bg-surface);
  padding: 12px;
  text-align: center;
}

.page-about .about-credential-img {
  width: 100%;
  height: auto;
  max-width: 300px;
  margin: 0 auto;
  display: block;
}

.page-about .about-credential-emblem figcaption {
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

.page-about .about-audience-panel {
  background: var(--bg-surface);
  border: 1px solid var(--grid-line);
  padding: 22px 20px;
  position: relative;
}

.page-about .about-audience-panel::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 60px;
  height: 3px;
  background: var(--accent);
}

.page-about .about-audience-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 12px;
}

.page-about .about-tag {
  display: inline-block;
  padding: 5px 10px;
  font-size: 12px;
  color: var(--accent);
  border: 1px solid rgba(255,107,53,0.55);
  background: rgba(255,107,53,0.08);
  letter-spacing: 0.04em;
}

.page-about .about-audience-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin: 0;
}

/* 延伸入口 */
.page-about .about-next {
  padding-bottom: 72px;
}

.page-about .about-next-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-next-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 16px;
  padding: 24px 20px;
  background: var(--bg-surface);
  border: 1px solid var(--grid-line);
  text-decoration: none;
  color: var(--text-primary);
  position: relative;
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

.page-about .about-next-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 0;
  background: linear-gradient(90deg, var(--accent), transparent);
  transition: height var(--ease);
}

.page-about .about-next-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.page-about .about-next-card:hover::after {
  height: 3px;
}

.page-about .about-next-code {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.page-about .about-next-title {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  margin: 0;
}

.page-about .about-next-text {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0;
}

.page-about .about-next-arrow {
  align-self: center;
  font-size: 22px;
  color: var(--accent);
  transition: transform var(--ease);
}

.page-about .about-next-card:hover .about-next-arrow {
  transform: translateX(4px);
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-timeline-desc {
    flex-basis: auto;
  }

  .page-about .about-bar-row {
    grid-template-columns: 92px 1fr;
    align-items: center;
  }
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 56px 24px 72px;
  }

  .page-about .about-hero-title {
    font-size: 48px;
  }

  .page-about .about-hero-desc {
    font-size: 16px;
  }

  .page-about .about-section {
    padding: 64px 0 80px;
  }

  .page-about .about-position-grid {
    grid-template-columns: 1fr 300px;
    gap: 40px;
  }

  .page-about .about-capability-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .page-about .about-credential-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-credential-bottom {
    grid-template-columns: 300px 1fr;
    align-items: stretch;
  }

  .page-about .about-next-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 72px 24px 88px;
  }

  .page-about .about-hero-title {
    font-size: 56px;
  }

  .page-about .about-section {
    padding: 76px 0 88px;
  }

  .page-about .about-position-grid {
    grid-template-columns: 1fr 360px;
    gap: 56px;
  }

  .page-about .about-capability-grid {
    gap: 56px;
  }

  .page-about .about-hero-meta {
    gap: 28px;
  }
}