.page-about {
  --about-line-color: rgba(0, 255, 0, 0.25);
  --about-gold-line: rgba(255, 215, 0, 0.35);
  --about-grid-line: rgba(255, 255, 255, 0.04);
  background:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  background-color: var(--primary-bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about .container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.page-about .section {
  padding: var(--space-12) 0;
  position: relative;
}

.page-about .section__kicker {
  color: var(--accent-green);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.page-about .section__kicker::before {
  content: "";
  display: block;
  width: 24px;
  height: 2px;
  background: var(--accent-green);
  flex-shrink: 0;
}

.page-about .section__title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: var(--space-4);
  letter-spacing: 0.01em;
  color: var(--text-primary);
}

.page-about .section__lead {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 640px;
}

.page-about .btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  border: 1px solid transparent;
  cursor: pointer;
}

.page-about .btn--primary {
  background-color: var(--accent-green);
  color: var(--primary-bg);
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  background-color: #00CC00;
  box-shadow: 0 0 0 3px rgba(0, 255, 0, 0.25);
}

.page-about .btn--gold {
  background-color: var(--accent-gold);
  color: var(--primary-bg);
}

.page-about .btn--gold:hover,
.page-about .btn--gold:focus-visible {
  background-color: #E6C200;
  box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.25);
}

.page-about .btn--ghost {
  background-color: transparent;
  border-color: var(--border);
  color: var(--text-primary);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.page-about .btn--small {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
}

.page-about .rotate-note {
  writing-mode: vertical-rl;
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.page-about .breadcrumb {
  padding-top: 6.5rem;
  padding-bottom: var(--space-4);
}

.page-about .breadcrumb__list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb__link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.page-about .breadcrumb__link:hover {
  color: var(--accent-green);
}

.page-about .breadcrumb__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.page-about .breadcrumb__item:not(:last-child)::after {
  content: "/";
  color: var(--border);
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--accent-gold);
  font-weight: 600;
}

/* ===== 英雄区 ===== */
.page-about .about-hero {
  padding: var(--space-8) 0 var(--space-12);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--space-8);
  position: relative;
}

.page-about .about-hero__kicker {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.page-about .about-hero__kicker::after {
  content: "";
  display: block;
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-green), transparent);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.12;
  margin: 0 0 var(--space-6);
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 80px;
  height: 4px;
  margin-top: var(--space-4);
  background: linear-gradient(90deg, var(--accent-green), var(--accent-gold));
  border-radius: var(--radius-sm);
}

.page-about .about-hero__lead {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 36em;
  margin-bottom: var(--space-8);
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  padding: var(--space-6);
  background: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  position: relative;
}

.page-about .about-hero__meta::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent-green), var(--accent-gold));
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
}

.page-about .about-hero__stat-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-green);
  line-height: 1.1;
}

.page-about .about-hero__stat:nth-child(4n + 4) .about-hero__stat-value,
.page-about .about-hero__stat:nth-child(4n + 2) .about-hero__stat-value {
  color: var(--accent-gold);
}

.page-about .about-hero__stat-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: var(--space-1);
}

.page-about .about-hero__visual {
  position: relative;
}

.page-about .about-hero__image {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__diag {
  position: absolute;
  right: -var(--space-4);
  top: -var(--space-4);
  width: 54px;
  height: 54px;
  border-top: 3px solid var(--accent-green);
  border-right: 3px solid var(--accent-green);
  opacity: 0.6;
  border-radius: 0 var(--radius) 0 0;
  pointer-events: none;
}

/* ===== 使命区 ===== */
.page-about .about-mission {
  position: relative;
}

.page-about .about-mission::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--accent-green), transparent 80%);
  opacity: 0.4;
}

.page-about .about-mission__grid {
  display: grid;
  gap: var(--space-8);
}

.page-about .about-mission__side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
}

.page-about .about-mission__side .rotate-note {
  position: absolute;
  right: var(--space-6);
  top: 0;
}

.page-about .about-mission__lead {
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: var(--space-6);
}

.page-about .about-mission__text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-8);
  max-width: 42em;
}

.page-about .about-mission__values {
  display: grid;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.page-about .about-mission__value {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4) var(--space-4);
  padding: var(--space-6);
  background: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about .about-mission__value:hover {
  border-color: var(--accent-green);
  box-shadow: 0 0 0 1px rgba(0, 255, 0, 0.15), var(--shadow-card);
}

.page-about .about-mission__value-num {
  grid-row: span 3;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--accent-green);
  line-height: 1;
}

.page-about .about-mission__value:nth-child(2) .about-mission__value-num {
  -webkit-text-stroke-color: var(--accent-gold);
}

.page-about .about-mission__value-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-primary);
}

.page-about .about-mission__value-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0;
}

.page-about .about-mission__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ===== 数据区 ===== */
.page-about .about-data {
  background:
    linear-gradient(135deg, transparent 0%, rgba(0, 255, 0, 0.03) 50%, transparent 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.page-about .about-data .section__header {
  margin-bottom: var(--space-12);
}

.page-about .about-data__grid {
  display: grid;
  gap: var(--space-6);
  margin-bottom: var(--space-12);
}

.page-about .about-data__item {
  background: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.page-about .about-data__item:hover {
  border-color: var(--accent-green);
  transform: translateY(-4px);
  box-shadow: var(--shadow-pop);
}

.page-about .about-data__item::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 3px;
  height: 48px;
  background: var(--accent-green);
  border-radius: 0 var(--radius) 0 0;
}

.page-about .about-data__item:nth-child(even)::after {
  background: var(--accent-gold);
}

.page-about .about-data__value {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent-green);
  margin: 0 0 var(--space-3);
}

.page-about .about-data__item:nth-child(even) .about-data__value {
  color: var(--accent-gold);
}

.page-about .about-data__label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.page-about .about-data__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

.page-about .about-data__visual {
  display: grid;
  gap: var(--space-8);
  align-items: center;
  background: linear-gradient(145deg, var(--secondary-bg), var(--elevated-bg));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
}

.page-about .about-data__image {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.page-about .about-data__viz-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin: 0 0 var(--space-4);
  color: var(--text-primary);
}

.page-about .about-data__viz-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.page-about .about-data__viz-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-6);
  display: grid;
  gap: var(--space-3);
}

.page-about .about-data__viz-list li {
  font-size: 0.9375rem;
  color: var(--text-primary);
  padding-left: var(--space-4);
  position: relative;
}

.page-about .about-data__viz-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  transform: rotate(45deg);
  border-radius: 1px;
}

.page-about .about-data__viz-list li:nth-child(2)::before {
  background: var(--accent-gold);
}

/* ===== 时间线区 ===== */
.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline .section__header {
  margin-bottom: var(--space-12);
}

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

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-green), var(--accent-gold), transparent);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 48px;
  padding-bottom: var(--space-8);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  width: 14px;
  height: 14px;
  border: 2px solid var(--accent-green);
  background: var(--primary-bg);
  border-radius: 50%;
  z-index: 1;
}

.page-about .about-timeline__item--gold::before {
  border-color: var(--accent-gold);
}

.page-about .about-timeline__year {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-green);
  display: block;
  margin-bottom: var(--space-2);
  line-height: 1;
}

.page-about .about-timeline__item--gold .about-timeline__year {
  color: var(--accent-gold);
}

.page-about .about-timeline__content {
  background: var(--secondary-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-green);
  border-radius: var(--radius);
  padding: var(--space-6);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about .about-timeline__item--gold .about-timeline__content {
  border-left-color: var(--accent-gold);
}

.page-about .about-timeline__content:hover,
.page-about .about-timeline__content:focus-within {
  border-left-color: var(--accent-green);
  box-shadow: 0 0 0 2px rgba(0, 255, 0, 0.12), var(--shadow-card);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0 0 var(--space-3);
  color: var(--text-primary);
}

.page-about .about-timeline__desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ===== 资质区 ===== */
.page-about .about-qualification {
  background:
    linear-gradient(135deg, rgba(255, 215, 0, 0.04), transparent 50%),
    var(--primary-bg);
  border-top: 1px solid var(--border);
}

.page-about .about-qualification__grid {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}

.page-about .about-qualification__lead {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.page-about .about-qualification__list {
  list-style: none;
  margin: 0 0 var(--space-8);
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-about .about-qualification__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background: var(--secondary-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition-fast);
}

.page-about .about-qualification__item:hover {
  border-color: var(--accent-green);
}

.page-about .about-qualification__tag {
  flex-shrink: 0;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .about-qualification__text {
  flex: 1;
  min-width: 200px;
  font-size: 0.9375rem;
  color: var(--text-primary);
}

.page-about .about-qualification__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.page-about .about-qualification__visual {
  position: relative;
}

.page-about .about-qualification__image {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}

.page-about .about-qualification__visual::after {
  content: "";
  position: absolute;
  right: -var(--space-4);
  bottom: -var(--space-4);
  width: 48px;
  height: 48px;
  border-right: 3px solid var(--accent-gold);
  border-bottom: 3px solid var(--accent-gold);
  border-radius: 0 0 var(--radius) 0;
  opacity: 0.7;
  pointer-events: none;
}

/* ===== 信任区 ===== */
.page-about .about-trust {
  padding: var(--space-8) 0 var(--space-12);
}

.page-about .about-trust__panel {
  background: linear-gradient(135deg, rgba(0, 255, 0, 0.05), rgba(255, 215, 0, 0.03));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-8);
  display: grid;
  gap: var(--space-6);
  position: relative;
  overflow: hidden;
}

.page-about .about-trust__panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--accent-green), var(--accent-gold));
}

.page-about .about-trust__text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
  max-width: 46em;
}

.page-about .about-trust__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
}

.page-about .about-trust__links a {
  color: var(--accent-green);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  border-bottom: 1px solid transparent;
}

.page-about .about-trust__links a:hover,
.page-about .about-trust__links a:focus-visible {
  color: var(--accent-gold);
  border-bottom-color: var(--accent-gold);
}

/* ===== 可见性缩略 ===== */
.page-about .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== 移动端优先 ===== */
@media (min-width: 640px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
  }

  .page-about .about-data__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (min-width: 900px) {
  .page-about .section {
    padding: var(--space-12) var(--space-6);
  }

  .page-about .section__title {
    font-size: 2.5rem;
  }

  .page-about .about-hero {
    padding-top: var(--space-12);
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.1fr 0.9fr;
    grid-template-rows: auto auto;
    gap: var(--space-12);
    align-items: center;
  }

  .page-about .about-hero__visual {
    grid-column: 2;
    grid-row: 1 / 3;
    align-self: center;
  }

  .page-about .about-hero__title {
    font-size: 3.25rem;
    line-height: 1.08;
  }

  .page-about .about-hero__lead {
    font-size: 1.125rem;
  }

  .page-about .about-mission__grid {
    grid-template-columns: 0.35fr 1fr;
    gap: var(--space-12);
  }

  .page-about .about-mission__side {
    position: sticky;
    top: 6rem;
    align-self: flex-start;
    height: fit-content;
  }

  .page-about .about-mission__side .rotate-note {
    position: static;
    margin-top: auto;
  }

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

  .page-about .about-data__visual {
    grid-template-columns: 1fr 0.85fr;
    gap: var(--space-8);
    padding: var(--space-8);
  }

  .page-about .about-data__value {
    font-size: 3rem;
  }

  .page-about .about-timeline__list {
    padding-left: 0;
  }

  .page-about .about-timeline__list::before {
    left: 50%;
    transform: translateX(-50%);
    top: 8px;
    bottom: 8px;
  }

  .page-about .about-timeline__item {
    width: 50%;
    padding-left: var(--space-12);
    padding-right: var(--space-12);
    padding-bottom: var(--space-12);
  }

  .page-about .about-timeline__item::before {
    left: auto;
    right: -7px;
    top: 12px;
    width: 14px;
    height: 14px;
  }

  .page-about .about-timeline__item:nth-child(odd) {
    margin-right: auto;
    margin-left: 0;
    text-align: right;
    padding-left: var(--space-12);
    padding-right: var(--space-12);
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__content {
    border-left: 1px solid var(--border);
    border-right: 3px solid var(--accent-green);
  }

  .page-about .about-timeline__item--gold:nth-child(4) .about-timeline__content {
    border-right-color: var(--accent-gold);
    border-left: 1px solid var(--border);
  }

  .page-about .about-timeline__item:nth-child(odd)::before {
    right: -7px;
    left: auto;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: auto;
    margin-right: 0;
    padding-left: var(--space-12);
    padding-right: 0;
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    left: -7px;
    right: auto;
  }

  .page-about .about-timeline__item:first-child::before,
  .page-about .about-timeline__item:last-child::before {
    top: 12px;
  }

  .page-about .about-qualification__grid {
    grid-template-columns: 1fr 0.8fr;
    gap: var(--space-12);
  }

  .page-about .about-qualification__visual {
    order: 2;
  }

  .page-about .about-trust__panel {
    grid-template-columns: 2fr 1fr;
    align-items: center;
    padding: var(--space-8) var(--space-12);
  }
}

@media (min-width: 1200px) {
  .page-about .section {
    padding-left: 0;
    padding-right: 0;
  }

  .page-about .about-hero__title {
    font-size: 3.5rem;
  }

  .page-about .about-data__grid {
    gap: var(--space-4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-data__item,
  .page-about .about-timeline__content,
  .page-about .about-mission__value {
    transition: none;
  }

  .page-about .about-data__item:hover {
    transform: none;
  }
}