.page-about {
  --about-border: rgba(62, 92, 138, 0.16);
  --about-accent-transparent: rgba(255, 107, 0, 0.12);
}

.page-about .container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

.page-about .section-lg {
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about .section {
  padding-top: 48px;
  padding-bottom: 48px;
}

.page-about .section-head {
  margin-bottom: 40px;
  max-width: 780px;
}

.page-about .section-eyebrow {
  display: block;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 10px;
  text-transform: uppercase;
}

.page-about .section-eyebrow::before {
  content: "";
  display: inline-block;
  width: 20px;
  height: 3px;
  background: var(--color-accent);
  margin-right: 10px;
  vertical-align: middle;
  clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
}

.page-about .section-title {
  font-family: var(--font-head);
  font-size: var(--fs-section);
  font-weight: 700;
  line-height: 1.08;
  color: var(--color-dark);
  margin: 0 0 12px;
  text-transform: uppercase;
}

.page-about .section-desc {
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--color-gray);
  margin: 0;
}

.page-about .breadcrumb {
  margin-bottom: 24px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
}

.page-about .breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb-list li::after {
  content: "/";
  color: rgba(255, 255, 255, 0.4);
  font-family: var(--font-data);
}

.page-about .breadcrumb-list li:last-child::after {
  display: none;
}

.page-about .breadcrumb-list a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.page-about .breadcrumb-list li[aria-current="page"] {
  color: var(--color-accent-light);
  font-weight: 500;
}

/* ===================== HERO ===================== */
.page-about .about-hero {
  position: relative;
  background: var(--color-dark);
  padding-top: 140px;
  padding-bottom: 72px;
  margin-top: calc(-1 * var(--header-h));
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(135deg, rgba(255, 107, 0, 0.08) 0%, transparent 38%),
    repeating-linear-gradient(-45deg, rgba(62, 92, 138, 0.08) 0px, rgba(62, 92, 138, 0.08) 1px, transparent 1px, transparent 12px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  bottom: -20%;
  width: 46%;
  height: 70%;
  background: var(--color-accent);
  clip-path: polygon(100% 0, 100% 78%, 65% 100%, 0 100%, 0 35%);
  opacity: 0.35;
  z-index: 1;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.page-about .about-hero-copy {
  color: var(--color-white);
}

.page-about .about-hero-badge {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.page-about .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: 999px;
}

.page-about .badge-accent {
  background: var(--color-accent);
  color: #fff;
}

.page-about .badge-live {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.9);
}

.page-about .badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ade80;
  position: relative;
}

.page-about .badge-dot::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1px solid rgba(74, 222, 128, 0.6);
  animation: about-pulse 2s infinite;
}

@keyframes about-pulse {
  0% { transform: scale(0.8); opacity: 1; }
  70% { transform: scale(1.6); opacity: 0; }
  100% { transform: scale(0.8); opacity: 0; }
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: var(--fs-hero);
  font-weight: 700;
  line-height: 1.08;
  margin: 0 0 20px;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

.page-about .about-hero-lead {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
  margin: 0 0 28px;
  max-width: 560px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 36px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border-radius: var(--radius);
  transition: transform var(--transition-med), box-shadow var(--transition-med), background var(--transition-med);
  letter-spacing: 0.02em;
  border: none;
  cursor: pointer;
}

.page-about .btn-lg {
  padding: 16px 34px;
  font-size: 1.02rem;
}

.page-about .btn-accent {
  background: var(--color-accent);
  color: #fff;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 100%, 12px 100%);
  padding-left: 30px;
  padding-right: 34px;
}

.page-about .btn-accent:hover {
  background: #e85d00;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 0, 0.35);
}

.page-about .btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.6);
}

.page-about .btn-outline:hover {
  border-color: var(--color-accent-light);
  color: var(--color-accent-light);
  transform: translateY(-2px);
}

.page-about .about-hero-trust {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 460px;
}

.page-about .trust-item {
  padding: 14px 12px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-card);
  text-align: center;
}

.page-about .trust-num {
  font-family: var(--font-data);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--color-accent-light);
  display: block;
  line-height: 1.3;
}

.page-about .trust-unit {
  font-size: 0.8rem;
  margin-left: 3px;
}

.page-about .trust-label {
  display: block;
  font-size: 0.74rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 4px;
  letter-spacing: 0.04em;
}

.page-about .about-hero-visual {
  position: relative;
}

.page-about .about-hero-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-card);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.page-about .about-hero-data-card {
  position: absolute;
  bottom: -28px;
  left: -24px;
  background: var(--color-dark-variant);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-card);
  padding: 18px 22px;
  display: flex;
  gap: 28px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.page-about .data-cell {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .data-number {
  font-family: var(--font-data);
  font-size: 1.65rem;
  font-weight: 600;
  line-height: 1.1;
  color: #fff;
}

.page-about .data-label {
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

/* ===================== 我们是谁 ===================== */
.page-about .about-statement {
  background: var(--color-bg);
}

.page-about .about-statement-inner {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 48px;
}

.page-about .about-statement-mark {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding-top: 6px;
}

.page-about .statement-index {
  font-family: var(--font-data);
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1;
}

.page-about .statement-line {
  width: 2px;
  height: 68px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  display: block;
}

.page-about .statement-caption {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-gray);
  writing-mode: vertical-rl;
  text-transform: uppercase;
}

.page-about .about-statement-content h2 {
  font-family: var(--font-head);
  font-size: var(--fs-section);
  font-weight: 700;
  color: var(--color-dark);
  margin: 0 0 16px;
  text-transform: uppercase;
}

.page-about .about-statement-lead {
  font-family: var(--font-body);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-dark-variant);
  margin: 0 0 40px;
  max-width: 880px;
}

.page-about .statement-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.page-about .statement-card {
  background: var(--color-white);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-med), box-shadow var(--transition-med);
}

.page-about .statement-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(10, 31, 68, 0.12);
}

.page-about .statement-card-num {
  font-family: var(--font-data);
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 600;
}

.page-about .statement-card-title {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--color-dark);
  margin: 10px 0 10px;
}

.page-about .statement-card p {
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--color-gray);
  margin: 0;
}

/* ===================== 时间线 ===================== */
.page-about .about-milestones {
  background: var(--color-white);
}

.page-about .about-milestones-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding-bottom: 20px;
}

.page-about .about-milestone-timeline {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 48px;
  align-items: start;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 36px;
  list-style: none;
  margin: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--color-accent) 0%, var(--color-blue-soft) 100%);
  border-radius: 4px;
}

.page-about .timeline-item {
  position: relative;
  margin-bottom: 56px;
}

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

.page-about .timeline-marker {
  position: absolute;
  left: -36px;
  top: 20px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 4px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-accent), 0 4px 12px rgba(255, 107, 0, 0.3);
  z-index: 2;
}

.page-about .timeline-card {
  background: var(--color-bg);
  border: 1px solid var(--about-border);
  border-left: 3px solid var(--color-accent);
  border-radius: 8px;
  padding: 28px 30px;
  transition: box-shadow var(--transition-med), transform var(--transition-med);
}

.page-about .timeline-card:hover {
  box-shadow: 0 8px 30px rgba(10, 31, 68, 0.12);
  transform: translateX(4px);
}

.page-about .timeline-version {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--about-accent-transparent);
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 10px;
}

.page-about .timeline-date {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-gray);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.page-about .timeline-card h3 {
  font-family: var(--font-head);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-dark);
  margin: 0 0 10px;
}

.page-about .timeline-card p {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--color-gray);
  margin: 0 0 16px;
  max-width: 720px;
}

.page-about .timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(62, 92, 138, 0.08);
  color: var(--color-dark-variant);
  border: 1px solid rgba(62, 92, 138, 0.18);
}

.page-about .chapter-dir {
  position: sticky;
  top: 96px;
  background: var(--color-dark);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  box-shadow: 0 12px 36px rgba(10, 31, 68, 0.2);
}

.page-about .chapter-dir-title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 14px;
}

.page-about .chapter-dir-progress {
  display: block;
  height: 3px;
  background: rgba(255, 255, 255, 0.14);
  border-radius: 3px;
  margin-bottom: 16px;
  overflow: hidden;
}

.page-about .chapter-dir-progress span {
  display: block;
  height: 100%;
  background: var(--color-accent);
  transform-origin: 0 50%;
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

.page-about .chapter-dir-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .chapter-dir-list a {
  display: block;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 4px;
  border-left: 2px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.page-about .chapter-dir-list a:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.page-about .chapter-dir-list a[aria-current="true"] {
  background: rgba(255, 107, 0, 0.16);
  color: var(--color-accent-light);
  border-left-color: var(--color-accent);
}

/* ===================== 索引体系 ===================== */
.page-about .about-index-system {
  background: var(--color-dark);
  position: relative;
  overflow: hidden;
}

.page-about .about-index-system::before {
  content: "";
  position: absolute;
  top: -30%;
  left: 30%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(255, 107, 0, 0.07);
  filter: blur(40px);
  pointer-events: none;
}

.page-about .about-index-head .section-eyebrow,
.page-about .about-index-head .section-title {
  color: #fff;
}

.page-about .about-index-head .section-desc {
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-index-head .section-title {
  border-bottom-color: var(--color-accent);
}

.page-about .about-index-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
}

.page-about .index-map {
  position: relative;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-card);
  min-height: 560px;
  padding: 36px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 24px;
}

.page-about .map-core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  z-index: 2;
  box-shadow: 0 0 0 8px rgba(255, 107, 0, 0.14), 0 0 0 16px rgba(255, 107, 0, 0.06), 0 12px 40px rgba(255, 107, 0, 0.3);
}

.page-about .map-core-label {
  font-family: var(--font-head);
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.3;
  text-align: center;
  margin-top: 4px;
  letter-spacing: 0.04em;
}

.page-about .map-core-sub {
  font-family: var(--font-data);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  opacity: 0.75;
  text-transform: uppercase;
}

.page-about .map-core-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .map-card {
  position: relative;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-card);
  padding: 20px 16px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-med);
  z-index: 1;
}

.page-about .map-card:hover {
  background: rgba(255, 107, 0, 0.14);
  border-color: var(--color-accent);
  transform: translateY(-2px) scale(1.01);
}

.page-about .map-card-1 {
  grid-column: 1;
  grid-row: 1;
}

.page-about .map-card-2 {
  grid-column: 3;
  grid-row: 1;
}

.page-about .map-card-3 {
  grid-column: 1;
  grid-row: 3;
}

.page-about .map-card-4 {
  grid-column: 3;
  grid-row: 3;
}

.page-about .map-card-number {
  font-family: var(--font-data);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.page-about .map-card-title {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 6px;
}

.page-about .map-card-desc {
  font-size: 0.82rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.55);
}

.page-about .map-card-route {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.35);
  margin-top: 10px;
}

.page-about .map-link {
  position: absolute;
  height: 2px;
  background: rgba(255, 107, 0, 0.5);
  transform-origin: 0 50%;
  width: 120px;
  z-index: 0;
}

.page-about .map-link-1 {
  top: 50%;
  left: 50%;
  transform: rotate(30deg);
  transform-origin: left center;
}

.page-about .map-link-2 {
  top: 30%;
  left: 42%;
  transform: rotate(-30deg);
  transform-origin: right center;
  width: 100px;
}

.page-about .map-link-3 {
  bottom: 30%;
  left: 42%;
  transform: rotate(30deg);
  transform-origin: right center;
  width: 100px;
}

.page-about .map-link-4 {
  bottom: 50%;
  left: 50%;
  transform: rotate(-30deg);
  width: 120px;
}

.page-about .about-index-note {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-index-note-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-card);
  padding: 24px;
  transition: background var(--transition-fast);
}

.page-about .about-index-note-card:hover {
  background: rgba(255, 255, 255, 0.09);
}

.page-about .note-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: rgba(255, 107, 0, 0.16);
  color: var(--color-accent-light);
  margin-bottom: 14px;
}

.page-about .about-index-note-card h3 {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  margin: 0 0 6px;
}

.page-about .about-index-note-card p {
  font-size: 0.88rem;
  line-height: 1.68;
  color: rgba(255, 255, 255, 0.62);
  margin: 0;
}

/* ===================== 数据能力 ===================== */
.page-about .about-data-capability {
  background: var(--color-bg);
}

.page-about .about-data-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}

.page-about .about-data-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.page-about .about-data-tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .tech-node {
  background: var(--color-white);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-card);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.page-about .tech-node-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 0, 0.14);
}

.page-about .tech-node-name {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-dark-variant);
  line-height: 1.3;
}

.page-about .about-data-content {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.page-about .about-data-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.page-about .data-metric-card {
  background: var(--color-dark);
  border-radius: var(--radius-card);
  padding: 22px 18px;
  border: 1px solid rgba(62, 92, 138, 0.3);
}

.page-about .data-metric-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.page-about .data-metric-top .data-number {
  font-size: 1.3rem;
  color: #fff;
}

.page-about .data-metric-trend {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .data-metric-trend.metric-up {
  color: #4ade80;
  background: rgba(74, 222, 128, 0.12);
  padding: 3px 8px;
  border-radius: 999px;
}

.page-about .data-metric-card p {
  font-size: 0.82rem;
  line-height: 1.62;
  color: rgba(255, 255, 255, 0.64);
  margin: 0;
}

.page-about .about-data-feature-list {
  background: var(--color-white);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-about .feature-list-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding: 22px 24px;
  border-bottom: 1px solid var(--about-border);
}

.page-about .feature-list-item:last-child {
  border-bottom: none;
}

.page-about .feature-list-index {
  font-family: var(--font-data);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-accent);
}

.page-about .feature-list-item h3 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-dark);
  margin: 0 0 6px;
}

.page-about .feature-list-item p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-gray);
  margin: 0;
}

/* ===================== 团队 ===================== */
.page-about .about-team {
  background: var(--color-white);
}

.page-about .about-team-layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  grid-template-areas: "team-intro team-ratio" "team-photo team-photo";
  gap: 24px;
}

.page-about .about-team-intro {
  grid-area: team-intro;
  background: var(--color-dark);
  color: #fff;
  border-radius: var(--radius-card);
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
}

.page-about .about-team-intro::after {
  content: "";
  position: absolute;
  right: -20px;
  bottom: -20px;
  width: 100px;
  height: 100px;
  background: var(--color-accent);
  opacity: 0.22;
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .team-card-label {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 12px;
  font-family: var(--font-data);
}

.page-about .team-card-number {
  display: block;
  font-family: var(--font-data);
  font-size: 3rem;
  font-weight: 600;
  color: var(--color-accent-light);
  line-height: 1.2;
}

.page-about .team-card-sub {
  display: block;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  margin: 6px 0 16px;
}

.page-about .about-team-intro p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.65);
  margin: 0;
  max-width: 420px;
}

.page-about .about-team-ratio {
  grid-area: team-ratio;
  background: var(--color-bg);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-card);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 22px;
}

.page-about .ratio-row {
  display: grid;
  grid-template-columns: 100px 1fr 48px;
  align-items: center;
  gap: 12px;
}

.page-about .ratio-label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-dark);
}

.page-about .ratio-bar {
  height: 9px;
  background: rgba(62, 92, 138, 0.12);
  border-radius: 99px;
  overflow: hidden;
}

.page-about .ratio-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  border-radius: 99px;
}

.page-about .ratio-value {
  font-family: var(--font-data);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-dark);
  text-align: right;
}

.page-about .about-team-photo {
  grid-area: team-photo;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--about-border);
}

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

/* ===================== 资质荣誉 ===================== */
.page-about .about-certifications {
  background: var(--color-bg);
}

.page-about .about-cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.page-about .cert-card {
  background: var(--color-white);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-card);
  padding: 30px 28px;
  box-shadow: var(--shadow-card);
  position: relative;
  transition: transform var(--transition-med);
}

.page-about .cert-card:hover {
  transform: translateY(-4px);
}

.page-about .cert-card-icon {
  width: 64px;
  height: 64px;
  border-radius: 12px;
  background: var(--about-accent-transparent);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.page-about .cert-card-tag {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  background: rgba(255, 107, 0, 0.08);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.page-about .cert-card h3 {
  font-family: var(--font-head);
  font-size: 1.19rem;
  font-weight: 600;
  color: var(--color-dark);
  margin: 0 0 10px;
  line-height: 1.4;
}

.page-about .cert-card p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-gray);
  margin: 0;
}

.page-about .about-cert-note {
  background: var(--color-dark);
  border-radius: var(--radius-card);
  padding: 36px 40px;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  align-items: start;
}

.page-about .cert-note-mark {
  color: var(--color-accent);
}

.page-about .about-cert-note p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  margin: 0 0 18px;
  max-width: 820px;
}

.page-about .about-cert-trust-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .trust-strip-item {
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.62);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  padding: 8px 14px;
}

.page-about .trust-strip-item strong {
  color: var(--color-accent-light);
  font-family: var(--font-data);
  margin-right: 4px;
}

/* ===================== CTA ===================== */
.page-about .about-cta {
  background: var(--color-accent);
  position: relative;
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  right: -8%;
  top: -40%;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 60px solid rgba(255, 255, 255, 0.1);
  pointer-events: none;
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: 18%;
  bottom: -60%;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 40px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.page-about .about-cta-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 12px 0;
}

.page-about .about-cta .section-eyebrow {
  margin-bottom: 8px;
}

.page-about .about-cta-title {
  font-family: var(--font-head);
  font-size: var(--fs-section);
  font-weight: 700;
  text-transform: uppercase;
  color: #fff;
  margin: 0 0 8px;
  line-height: 1.1;
}

.page-about .about-cta-desc {
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.88);
  margin: 0;
  max-width: 680px;
}

.page-about .about-cta-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-shrink: 0;
}

.page-about .about-cta .btn-accent {
  background: #fff;
  color: var(--color-dark);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 100%, 12px 100%);
}

.page-about .about-cta .btn-accent:hover {
  background: #f0f0f0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.page-about .about-cta .btn-outline {
  border-color: #fff;
  color: #fff;
}

.page-about .about-cta .btn-outline:hover {
  border-color: var(--color-dark);
  color: var(--color-dark);
  background: #fff;
}

.page-about .back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 99;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-dark);
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.3);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-med), transform var(--transition-med), visibility var(--transition-med), background var(--transition-fast);
  box-shadow: 0 6px 24px rgba(10, 31, 68, 0.3);
}

.page-about .back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .back-top:hover {
  background: var(--color-accent);
}

/* ===================== 响应式 ===================== */
@media (min-width: 1025px) {
  .page-about .about-milestones-head {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
    gap: 40px;
  }

  .page-about .about-milestones-head .section-desc {
    max-width: 420px;
    margin-bottom: 2px;
  }
}

@media (max-width: 1024px) {
  .page-about .about-hero-inner {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .page-about .about-hero {
    padding-bottom: 90px;
  }

  .page-about .about-hero-data-card {
    left: auto;
    right: 0;
  }

  .page-about .about-statement-inner {
    grid-template-columns: 90px 1fr;
    gap: 24px;
  }

  .page-about .statement-card-grid {
    grid-template-columns: 1fr;
  }

  .page-about .about-milestone-timeline {
    grid-template-columns: 1fr;
  }

  .page-about .chapter-dir {
    position: static;
    margin-top: 32px;
  }

  .page-about .about-chapter-dir {
    display: none;
  }

  .page-about .about-index-layout {
    grid-template-columns: 1fr;
  }

  .page-about .about-data-layout {
    grid-template-columns: 1fr;
  }

  .page-about .about-team-layout {
    grid-template-columns: 1fr;
    grid-template-areas: "team-intro" "team-ratio" "team-photo";
  }

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

  .page-about .about-cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .page-about .section-lg {
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .page-about .about-hero {
    padding-top: 120px;
    padding-bottom: 56px;
  }

  .page-about .about-hero h1 {
    font-size: 2.2rem;
  }

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

  .page-about .trust-num {
    font-size: 1.05rem;
  }

  .page-about .about-hero-data-card {
    position: static;
    margin-top: 16px;
  }

  .page-about .about-statement-inner {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .page-about .statement-caption {
    writing-mode: horizontal-tb;
    margin-top: -10px;
  }

  .page-about .statement-line {
    display: none;
  }

  .page-about .about-milestone-timeline {
    gap: 24px;
  }

  .page-about .index-map {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(6, auto);
    gap: 14px;
    min-height: auto;
    padding: 24px;
  }

  .page-about .map-core {
    position: relative;
    top: auto;
    left: auto;
    transform: none;
    width: auto;
    height: 120px;
    border-radius: 12px;
  }

  .page-about .map-card-1,
  .page-about .map-card-2,
  .page-about .map-card-3,
  .page-about .map-card-4 {
    grid-column: auto;
    grid-row: auto;
  }

  .page-about .map-link {
    display: none;
  }

  .page-about .about-data-metrics {
    grid-template-columns: 1fr;
  }

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

  .page-about .ratio-row {
    grid-template-columns: 76px 1fr 42px;
  }

  .page-about .about-cert-note {
    grid-template-columns: 1fr;
    padding: 28px 24px;
  }

  .page-about .about-cta-inner {
    padding: 0;
  }

  .page-about .about-cta-title {
    font-size: 1.8rem;
  }
}