.page-about {
  --about-font-display-cn: Impact, Bahnschrift, "Arial Narrow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --about-muted-light: rgba(255, 255, 255, 0.66);
  --about-line-light: rgba(255, 255, 255, 0.14);
  --about-grid-line: rgba(255, 255, 255, 0.045);
  background: var(--light-100);
  color: var(--ink-900);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-about .about-breadcrumb {
  background: var(--navy-900);
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line-light);
}
.page-about .about-breadcrumb .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--about-muted-light);
}
.page-about .about-breadcrumb a {
  color: var(--about-muted-light);
  text-decoration: none;
  transition: color var(--transition);
}
.page-about .about-breadcrumb a:hover {
  color: var(--green-400);
}
.page-about .about-breadcrumb .sep {
  color: var(--orange-400);
}
.page-about .about-breadcrumb [aria-current="page"] {
  color: #FFFFFF;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: #FFFFFF;
  padding: 56px 0 64px;
  background:
    radial-gradient(circle at 88% 10%, rgba(255, 107, 53, 0.20), transparent 26%),
    radial-gradient(circle at 8% 92%, rgba(57, 255, 20, 0.10), transparent 24%),
    linear-gradient(150deg, var(--navy-900) 0%, var(--navy-700) 76%, #0d2752 100%);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--orange-400) 0%, var(--orange-400) 46%, var(--green-400) 46%, var(--green-400) 100%);
  z-index: 1;
}
.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}
.page-about .about-hero .section-kicker {
  margin-bottom: 18px;
}
.page-about .about-hero-title {
  font-family: var(--about-font-display-cn);
  font-size: clamp(34px, 7.2vw, 68px);
  line-height: 1.04;
  letter-spacing: 0.01em;
  font-weight: 700;
  margin: 0 0 20px;
  max-width: 1000px;
}
.page-about .about-title-accent {
  display: block;
  color: var(--orange-400);
}
.page-about .about-hero-lede {
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.86);
  max-width: 720px;
  margin: 0 0 14px;
}
.page-about .about-hero-desc {
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-muted-light);
  max-width: 760px;
  margin: 0 0 28px;
}
.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--about-line-light);
  border: 1px solid var(--about-line-light);
  max-width: 860px;
  margin-bottom: 30px;
}
.page-about .about-hero-stat {
  background: rgba(10, 31, 68, 0.82);
  padding: 18px 16px;
}
.page-about .about-stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--green-400);
}
.page-about .about-hero-stat:first-child .about-stat-value {
  color: var(--orange-400);
}
.page-about .about-stat-label {
  display: block;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.66);
  margin-top: 8px;
}
.page-about .about-chapter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}
.page-about .about-chapter-nav a {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.03em;
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.page-about .about-chapter-nav a:hover {
  color: var(--green-400);
  border-bottom-color: var(--orange-400);
}

.page-about .about-section-head {
  margin-bottom: 32px;
}
.page-about .section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--orange-500);
  margin: 0 0 10px;
}
.page-about .section-kicker::before {
  content: "";
  display: inline-block;
  width: 26px;
  height: 2px;
  background: var(--green-400);
}
.page-about .section-title {
  font-family: var(--about-font-display-cn);
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1.12;
  font-weight: 700;
  color: var(--ink-900);
  margin: 0;
  padding-bottom: 14px;
  position: relative;
}
.page-about .section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 76px;
  height: 4px;
  background: linear-gradient(90deg, var(--orange-400) 0%, var(--orange-400) 55%, var(--green-400) 55%, var(--green-400) 100%);
}
.page-about .section-lede {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--muted-600);
  max-width: 680px;
  margin: 16px 0 0;
}

.page-about .about-origin {
  padding: 64px 0;
}
.page-about .about-origin-grid {
  display: grid;
  gap: 28px;
  margin-top: 34px;
}
.page-about .about-origin-quote {
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.65;
  color: var(--navy-900);
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.08), transparent 70%);
  border-left: 4px solid var(--orange-400);
  margin: 0;
  padding: 8px 0 8px 20px;
  align-self: start;
}
.page-about .about-origin-copy p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-900);
  margin: 0 0 16px;
}
.page-about .about-origin-copy p:last-child {
  margin-bottom: 0;
}
.page-about .about-origin-copy a {
  color: var(--orange-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 90, 42, 0.4);
  transition: border-color var(--transition);
}
.page-about .about-origin-copy a:hover {
  border-bottom-color: var(--orange-500);
}

.page-about .about-capabilities {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 64px 0;
}
.page-about .about-cap-figure {
  margin: 28px 0 36px;
  border: 1px solid var(--line);
  background: var(--navy-900);
}
.page-about .about-cap-figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-cap-grid {
  display: grid;
  gap: 16px;
}
.page-about .about-cap-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy-900);
  padding: 22px 20px 18px;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.page-about .about-cap-card:hover,
.page-about .about-cap-card:focus-within {
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
  border-top-color: var(--orange-400);
}
.page-about .about-cap-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-600);
  margin: 0 0 12px;
}
.page-about .about-cap-number {
  font-family: var(--font-mono);
  font-size: 36px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--navy-900);
  margin: 0 0 12px;
  transition: color var(--transition);
}
.page-about .about-cap-card:hover .about-cap-number {
  color: var(--orange-500);
}
.page-about .about-cap-name {
  font-family: var(--about-font-display-cn);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-900);
  margin: 0 0 8px;
}
.page-about .about-cap-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted-600);
  margin: 0;
}
.page-about .about-cap-note {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted-600);
  background: var(--light-100);
  border-left: 2px solid var(--green-400);
  padding: 0 10px;
  transition: max-height 180ms ease-in-out, opacity 180ms ease-in-out, padding 180ms ease-in-out, margin-top 180ms ease-in-out;
}
.page-about .about-cap-card:hover .about-cap-note,
.page-about .about-cap-card:focus-within .about-cap-note {
  max-height: 140px;
  opacity: 1;
  margin-top: 14px;
  padding: 8px 10px;
}
@media (hover: none) {
  .page-about .about-cap-note {
    max-height: none;
    opacity: 1;
    margin-top: 14px;
    padding: 8px 10px;
  }
}

.page-about .about-journey {
  position: relative;
  overflow: hidden;
  color: #FFFFFF;
  padding: 64px 0;
  background:
    radial-gradient(circle at 90% 8%, rgba(255, 107, 53, 0.12), transparent 26%),
    linear-gradient(160deg, var(--navy-900) 0%, #0d2854 100%);
}
.page-about .about-journey::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}
.page-about .about-journey .section-title {
  color: #FFFFFF;
}
.page-about .about-journey .section-lede {
  color: rgba(255, 255, 255, 0.72);
}
.page-about .about-journey-wrap {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
  margin-top: 40px;
}
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding-left: 28px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange-400) 0%, rgba(255, 107, 53, 0.16) 28%, rgba(57, 255, 20, 0.4) 66%, var(--green-400) 100%);
}
.page-about .about-tl-item {
  position: relative;
  background: rgba(10, 31, 68, 0.52);
  border: 1px solid var(--about-line-light);
  margin: 0 0 18px;
}
.page-about .about-tl-item:last-child {
  margin-bottom: 0;
}
.page-about .about-tl-summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  list-style: none;
  margin: 0;
  padding: 16px 42px 16px 24px;
  cursor: pointer;
  font-size: 16px;
}
.page-about .about-tl-summary::-webkit-details-marker {
  display: none;
}
.page-about .about-tl-summary::marker {
  content: "";
}
.page-about .about-tl-summary::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 20px;
  width: 11px;
  height: 11px;
  background: var(--green-400);
  border: 2px solid var(--navy-900);
  box-shadow: 0 0 0 1px var(--green-400);
  transform: rotate(45deg);
  transition: background 160ms ease, box-shadow 160ms ease;
}
.page-about .about-tl-item[open] .about-tl-summary::before {
  background: var(--orange-400);
  box-shadow: 0 0 0 1px var(--orange-400);
}
.page-about .about-tl-summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--orange-400);
}
.page-about .about-tl-item[open] .about-tl-summary::after {
  content: "−";
}
.page-about .about-tl-flag {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange-400);
  background: rgba(255, 107, 53, 0.14);
  padding: 2px 8px;
  line-height: 1.5;
}
.page-about .about-tl-title {
  font-family: var(--about-font-display-cn);
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
}
.page-about .about-tl-desc {
  margin: 0;
  padding: 0 24px 20px 24px;
}
.page-about .about-tl-desc p {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.74);
  margin: 0;
}
.page-about .about-journey-figure {
  margin: 0;
}
.page-about .about-journey-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--about-line-light);
}
.page-about .about-journey-figure figcaption {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.56);
  margin-top: 10px;
}

.page-about .about-cert {
  padding: 64px 0;
}
.page-about .about-cert-grid {
  display: grid;
  gap: 16px;
  margin-top: 36px;
}
.page-about .about-cert-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 24px 20px;
}
.page-about .about-cert-card::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 18px;
  width: 9px;
  height: 9px;
  background: var(--green-400);
  transform: rotate(45deg);
}
.page-about .about-cert-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--navy-900);
  background: rgba(255, 107, 53, 0.1);
  border: 1px solid rgba(255, 107, 53, 0.35);
  padding: 3px 10px;
  margin: 0 0 14px;
}
.page-about .about-cert-title {
  font-family: var(--about-font-display-cn);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-900);
  margin: 0 0 8px;
}
.page-about .about-cert-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted-600);
  margin: 0;
}
.page-about .about-cert-full {
  display: none;
  margin-top: 14px;
  padding: 12px 14px;
  background: var(--light-100);
  border-left: 2px solid var(--green-400);
}
.page-about .about-cert-full p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted-600);
  margin: 0;
}
.page-about .about-cert-card[data-open] .about-cert-full {
  display: block;
}
.page-about .about-cert-toggle {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange-500);
  background: transparent;
  border: 0;
  border-bottom: 1px dashed rgba(232, 90, 42, 0.5);
  padding: 0 0 2px;
  margin-top: 16px;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
}
.page-about .about-cert-toggle:hover {
  color: var(--navy-900);
  border-bottom-color: var(--navy-900);
}

.page-about .about-team {
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding: 64px 0;
}
.page-about .about-team-grid {
  display: grid;
  gap: 16px;
  margin-top: 36px;
}
.page-about .about-team-card {
  background: var(--light-100);
  border: 1px solid var(--line);
  border-left: 3px solid var(--green-400);
  padding: 22px 20px;
}
.page-about .about-team-role {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--orange-500);
  margin: 0 0 10px;
}
.page-about .about-team-name {
  font-family: var(--about-font-display-cn);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-900);
  margin: 0 0 10px;
}
.page-about .about-team-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted-600);
  margin: 0;
}
.page-about .about-team-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 36px;
  background: var(--navy-900);
  padding: 28px 24px;
  color: #FFFFFF;
}
.page-about .about-team-contact-copy {
  flex: 1 1 320px;
}
.page-about .about-contact-line {
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 6px;
}
.page-about .about-contact-line a {
  color: #FFFFFF;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  transition: color var(--transition), border-color var(--transition);
}
.page-about .about-contact-line a:hover {
  color: var(--green-400);
  border-color: var(--green-400);
}
.page-about .about-contact-email {
  font-family: var(--font-mono);
  color: var(--green-400);
}
.page-about .about-contact-phone {
  font-family: var(--font-mono);
  color: var(--orange-400);
}
.page-about .about-contact-note {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.6);
  margin: 0;
}
.page-about .about-team-contact .btn-ghost {
  border-color: rgba(255, 255, 255, 0.6);
  color: #FFFFFF;
}
.page-about .about-team-contact .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #FFFFFF;
}

.page-about .about-bottom-band {
  position: relative;
  overflow: hidden;
  background: var(--navy-900);
  color: #FFFFFF;
  text-align: center;
  padding: 80px 0;
}
.page-about .about-bottom-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}
.page-about .about-cta-inner {
  position: relative;
  z-index: 1;
}
.page-about .about-cta-title {
  font-family: var(--about-font-display-cn);
  font-size: clamp(28px, 4.6vw, 44px);
  line-height: 1.15;
  font-weight: 700;
  margin: 0 0 14px;
}
.page-about .about-cta-text {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  max-width: 640px;
  margin: 0 auto 30px;
}
.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}
.page-about .about-bottom-band .btn-ghost {
  border-color: rgba(255, 255, 255, 0.6);
  color: #FFFFFF;
}
.page-about .about-bottom-band .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #FFFFFF;
}

.page-about a:focus-visible,
.page-about button:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--orange-400);
  outline-offset: 3px;
}

@media (min-width: 640px) {
  .page-about .about-cap-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .page-about .about-cert-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .page-about .about-team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 72px 0 80px;
  }
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-origin,
  .page-about .about-capabilities,
  .page-about .about-journey,
  .page-about .about-cert,
  .page-about .about-team {
    padding: 88px 0;
  }
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.4fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-cap-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .page-about .about-journey-wrap {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 48px;
    align-items: start;
  }
  .page-about .about-bottom-band {
    padding: 96px 0;
  }
}