.page-about {
  --about-line-slate: rgba(74, 85, 104, 0.35);
  --about-bg-grid: rgba(74, 85, 104, 0.06);
  background:
    linear-gradient(var(--about-bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-bg-grid) 1px, transparent 1px),
    var(--color-space);
  background-size: 44px 44px;
  color: var(--color-cream);
  line-height: 1.6;
  box-sizing: border-box;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: inherit;
}

/* 面包屑 */
.page-about .breadcrumbs {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-4) var(--space-4) 0;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-number);
  font-size: 0.8125rem;
  color: rgba(245, 245, 240, 0.55);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: var(--space-2);
  color: var(--color-slate);
}

.page-about .breadcrumbs a {
  color: rgba(245, 245, 240, 0.75);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--color-neon);
  border-color: var(--color-neon);
  outline: none;
}

.page-about .breadcrumbs li[aria-current="page"] {
  color: var(--color-cream);
}

/* 首屏品牌宣言 */
.about-hero {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-7);
}

.about-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
}

.about-hero-copy {
  position: relative;
  z-index: 0;
}

.about-hero-copy::after {
  content: "36";
  font-family: var(--font-number);
  font-size: clamp(8rem, 20vw, 14rem);
  font-weight: 700;
  line-height: 1;
  color: rgba(57, 255, 20, 0.05);
  position: absolute;
  right: -0.1em;
  bottom: -0.25em;
  z-index: -1;
  pointer-events: none;
}

.about-hero h1 {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: clamp(2.5rem, 7vw, 5rem);
  line-height: 1.02;
  letter-spacing: 0.01em;
  margin: var(--space-4) 0;
}

.about-hero-accent {
  color: var(--color-neon);
}

.about-hero-lead {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  color: rgba(245, 245, 240, 0.85);
  max-width: 34em;
  margin: 0 0 var(--space-5);
}

.about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--about-line-slate);
}

.about-meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-family: var(--font-number);
  font-size: 0.8125rem;
  color: rgba(245, 245, 240, 0.6);
}

.about-meta-num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-neon);
}

.about-hero-figure {
  margin: 0;
}

.about-hero-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--about-line-slate);
  border-radius: 10px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}

.about-hero-figure figcaption,
.about-mission-figure figcaption,
.about-timeline-top figcaption {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: rgba(245, 245, 240, 0.45);
}

/* 我们做什么 */
.about-mission {
  background: rgba(26, 29, 35, 0.42);
  border-top: 1px solid var(--about-line-slate);
  border-bottom: 1px solid var(--about-line-slate);
}

.about-mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
}

.about-mission-copy .section-label,
.about-timeline .section-label,
.about-stats .section-label,
.about-security .section-label,
.about-local .section-label {
  margin-bottom: var(--space-2);
}

.about-mission-copy h2,
.about-timeline h2,
.about-stats h2,
.about-security h2,
.about-local h2,
.about-connect h2 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: clamp(1.75rem, 3vw, 2.75rem);
  line-height: 1.15;
  margin: 0 0 var(--space-4);
}

.about-mission-text {
  color: rgba(245, 245, 240, 0.8);
  max-width: 40em;
}

.about-mission-text + .about-mission-text {
  margin-top: var(--space-4);
}

.about-mission-figure {
  margin: 0;
}

.about-mission-figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--about-line-slate);
  border-radius: 10px;
}

/* 发展里程碑 */
.about-timeline-intro {
  max-width: 32em;
  color: rgba(245, 245, 240, 0.75);
  margin: 0 0 var(--space-5);
}

.about-timeline-top {
  margin: 0 0 var(--space-6);
}

.about-timeline-top img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--about-line-slate);
  border-radius: 10px;
}

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

.about-timeline-list::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-neon), rgba(74, 85, 104, 0.35));
}

.about-timeline-item {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.about-timeline-item:last-child {
  margin-bottom: 0;
}

.about-timeline-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.about-timeline-version {
  font-family: var(--font-number);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-neon);
  letter-spacing: 0.12em;
}

.about-timeline-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-space);
  border: 2px solid var(--color-neon);
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.45);
  transition: transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out), background-color var(--duration-fast) var(--ease-out);
}

.about-timeline-card {
  background: rgba(11, 27, 61, 0.6);
  border: 1px solid var(--about-line-slate);
  border-radius: 10px;
  padding: var(--space-4);
  transition: background-color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}

.about-timeline-card h3 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.25rem;
  margin: 0 0 var(--space-2);
}

.about-timeline-card p {
  margin: 0;
  font-size: 0.9375rem;
  color: rgba(245, 245, 240, 0.78);
}

.about-timeline-card:hover,
.about-timeline-card:focus-within {
  background: rgba(11, 27, 61, 0.82);
  border-color: rgba(57, 255, 20, 0.45);
  transform: translateY(-2px);
}

.about-timeline-node:hover .about-timeline-dot,
.about-timeline-node:focus-within .about-timeline-dot {
  background: var(--color-neon);
  box-shadow: 0 0 16px rgba(57, 255, 20, 0.7);
  transform: scale(1.15);
}

/* 数据服务能力 */
.about-stats {
  border-top: 1px solid var(--about-line-slate);
  border-bottom: 1px solid var(--about-line-slate);
  background: linear-gradient(135deg, rgba(11, 27, 61, 0.9), rgba(26, 29, 35, 0.6));
}

.about-stats-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.about-stats-primary {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.about-stat-hero {
  background: rgba(26, 29, 35, 0.65);
  border: 1px solid var(--about-line-slate);
  border-radius: 12px;
  padding: var(--space-5) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  position: relative;
  overflow: hidden;
}

.about-stat-hero::after {
  content: "";
  position: absolute;
  right: -3rem;
  top: -3rem;
  width: 9rem;
  height: 9rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.25), transparent 70%);
  pointer-events: none;
}

.about-stat-hero .about-stat-num {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  color: var(--color-heat);
}

.about-stat-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.about-stat-mini {
  background: rgba(11, 27, 61, 0.55);
  border: 1px solid var(--about-line-slate);
  border-radius: 10px;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  transition: background-color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
}

.about-stat-mini:hover {
  background: rgba(11, 27, 61, 0.8);
  border-color: rgba(57, 255, 20, 0.4);
}

.about-stat-num {
  font-family: var(--font-number);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-cream);
}

.about-stat-label {
  font-size: 0.8125rem;
  color: rgba(245, 245, 240, 0.6);
}

.about-stats-secondary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.about-stats-secondary .about-stat-mini {
  padding: var(--space-4) var(--space-3);
}

.about-stats-note {
  max-width: 42em;
  margin: var(--space-5) 0 0;
  font-size: 0.875rem;
  color: rgba(245, 245, 240, 0.6);
  border-left: 2px solid var(--color-neon);
  padding-left: var(--space-4);
}

/* 安全与资质 */
.about-security-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.about-security-card {
  background: rgba(11, 27, 61, 0.55);
  border: 1px solid var(--about-line-slate);
  border-radius: 12px;
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: background-color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
}

.about-security-card:hover {
  background: rgba(11, 27, 61, 0.8);
  border-color: rgba(107, 142, 35, 0.55);
}

.about-security-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: 1px solid var(--color-neon);
  color: var(--color-neon);
  font-family: var(--font-number);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.about-security-card h3 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.25rem;
  margin: 0;
}

.about-security-card p {
  margin: 0;
  font-size: 0.9375rem;
  color: rgba(245, 245, 240, 0.75);
}

/* 湖南本地服务 */
.about-local-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
}

.about-local-copy p {
  color: rgba(245, 245, 240, 0.78);
  max-width: 38em;
}

.about-local-copy .btn {
  margin-top: var(--space-4);
}

.about-local-panel {
  background: linear-gradient(145deg, rgba(210, 125, 86, 0.16), rgba(210, 125, 86, 0.04));
  border: 1px solid rgba(210, 125, 86, 0.4);
  border-radius: 14px;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  position: relative;
  overflow: hidden;
}

.about-local-panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-terra);
}

.about-local-panel-label {
  font-family: var(--font-number);
  font-size: 0.8125rem;
  color: var(--color-terra);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.about-local-panel-num {
  font-family: var(--font-number);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--color-cream);
  line-height: 1.1;
}

.about-local-panel-text {
  font-size: 0.9375rem;
  color: rgba(245, 245, 240, 0.7);
  max-width: 20em;
}

/* 进一步了解 */
.about-connect {
  border-top: 1px solid var(--about-line-slate);
  background: rgba(26, 29, 35, 0.35);
}

.about-connect h2 {
  margin-bottom: var(--space-2);
}

.about-connect-lead {
  color: rgba(245, 245, 240, 0.7);
  max-width: 36em;
  margin-bottom: var(--space-5);
}

.about-connect-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* 桌面端增强 */
@media (min-width: 768px) {
  .about-hero-inner {
    grid-template-columns: 1.15fr 0.85fr;
    gap: var(--space-7);
  }

  .about-hero {
    padding-top: var(--space-7);
    padding-bottom: var(--space-8);
  }

  .about-hero-meta {
    gap: var(--space-6);
  }

  .about-mission-grid {
    grid-template-columns: 1fr 0.9fr;
    gap: var(--space-7);
  }

  .about-timeline-list {
    padding: 0 var(--space-3);
  }

  .about-timeline-list::before {
    left: 50%;
    top: 0.75rem;
    bottom: 0.75rem;
    transform: translateX(-0.5px);
  }

  .about-timeline-item {
    grid-template-columns: 1fr 64px 1fr;
    gap: 0;
    align-items: center;
  }

  .about-timeline-node {
    grid-column: 2;
    grid-row: 1;
  }

  .about-timeline-version {
    font-size: 0.8125rem;
  }

  .about-timeline-item:nth-child(odd) .about-timeline-card {
    grid-column: 3;
    text-align: left;
  }

  .about-timeline-item:nth-child(even) .about-timeline-card {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
  }

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

  .about-stats-layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-6);
  }

  .about-stats-secondary {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
  }

  .about-security-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }

  .about-local-grid {
    grid-template-columns: 1fr 0.8fr;
    gap: var(--space-7);
  }
}

@media (min-width: 1024px) {
  .about-hero {
    min-height: 620px;
  }

  .about-hero-inner {
    min-height: 520px;
  }

  .about-timeline-list {
    padding: 0 var(--space-6);
  }

  .about-timeline-card {
    padding: var(--space-5);
  }

  .about-stats-layout {
    gap: var(--space-7);
  }

  .about-security-grid {
    gap: var(--space-6);
  }
}