.page-about {
  --about-fade-mint: rgba(214, 240, 226, 0.78);
  --about-fade-deep: rgba(214, 240, 226, 0.56);
  --about-hair: rgba(11, 61, 46, 0.12);
  color: var(--rock-gray);
}

/* ========== 首屏 ========== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep-bluegreen);
  padding: 56px 0 64px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 64%;
  background: linear-gradient(118deg, var(--prairie-green) 0%, var(--deep-bluegreen) 100%);
  clip-path: polygon(10% 0, 100% 0, 100% 100%, 0 100%);
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(115deg, transparent 0 20px, rgba(217, 255, 63, 0.05) 20px 21px),
    repeating-linear-gradient(-52deg, transparent 0 30px, rgba(217, 255, 63, 0.03) 30px 31px);
  z-index: 0;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 34px;
}

.page-about .about-hero .breadcrumb__link,
.page-about .about-hero .breadcrumb__current {
  color: rgba(214, 240, 226, 0.85);
}

.page-about .about-hero .breadcrumb__sep {
  color: var(--fluoro-yellow);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-hero__copy {
  max-width: 680px;
}

.page-about .about-hero__tag {
  margin-bottom: 12px;
}

.page-about .about-hero__title {
  position: relative;
  margin: 16px 0 18px;
  padding-left: 20px;
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1.12;
  color: var(--cream);
  font-weight: 900;
}

.page-about .about-hero__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 6px;
  background: var(--fluoro-yellow);
  transform: skewX(-14deg);
}

.page-about .about-hero__lead {
  color: var(--about-fade-mint);
  line-height: 1.8;
  font-size: 15px;
  margin-bottom: 26px;
}

.page-about .about-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__quick .mono-text {
  margin-right: 4px;
}

.page-about .about-hero__card {
  background: var(--charcoal);
  color: var(--cream);
  padding: 22px;
  clip-path: var(--clip-corner);
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero__status {
  margin-bottom: 18px;
}

.page-about .about-hero__stats {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stat {
  padding: 14px;
  background: rgba(217, 255, 63, 0.07);
  clip-path: var(--clip-corner-sm);
}

.page-about .about-hero__num {
  display: block;
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 900;
  color: var(--fluoro-yellow);
  line-height: 1.1;
}

.page-about .about-hero__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: rgba(214, 240, 226, 0.74);
}

.page-about .about-hero__note {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed rgba(253, 249, 238, 0.18);
  font-size: 12px;
  color: rgba(214, 240, 226, 0.6);
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 48px;
  padding: 12px 16px;
  background: rgba(10, 35, 66, 0.68);
  border-top: 1px solid rgba(217, 255, 63, 0.2);
  border-bottom: 1px solid rgba(217, 255, 63, 0.2);
  clip-path: var(--clip-corner-sm);
}

.page-about .about-index a {
  color: var(--cream);
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  padding: 6px 10px;
  clip-path: var(--clip-corner-sm);
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .about-index a .mono-text {
  margin-right: 4px;
  color: var(--fluoro-yellow);
}

.page-about .about-index a:hover {
  background: var(--lime);
  color: var(--charcoal);
}

.page-about .about-index a:hover .mono-text {
  color: var(--charcoal);
}

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 104px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

/* ========== 章节头部通用 ========== */
.page-about .about-section__head {
  max-width: 780px;
  margin-bottom: 32px;
}

.page-about .about-section__head .section-title {
  margin: 6px 0 0;
}

.page-about .about-section__intro {
  margin-top: 12px;
  line-height: 1.85;
}

.page-about .about-development .about-section__intro,
.page-about .about-credentials .about-section__intro {
  color: var(--about-fade-mint);
}

/* ========== 01 起源 ========== */
.page-about .about-origin {
  padding-top: 72px;
  padding-bottom: 84px;
}

.page-about .about-origin__grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-origin__copy p {
  line-height: 1.8;
  margin-bottom: 16px;
}

.page-about .about-origin__lead {
  font-size: 17px;
  color: var(--charcoal);
}

.page-about .about-origin__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-origin__list-item {
  display: flex;
  gap: 10px;
  align-items: baseline;
  background: rgba(11, 61, 46, 0.05);
  padding: 12px 14px;
  clip-path: var(--clip-corner-sm);
  font-size: 14px;
}

.page-about .about-origin__list-item .mono-text {
  font-weight: 800;
  color: var(--hot-red);
}

.page-about .about-origin__media {
  position: relative;
  margin: 0;
}

.page-about .about-origin__media::before {
  content: "";
  position: absolute;
  inset: 16px 16px -16px -16px;
  background: var(--lime);
  clip-path: var(--clip-corner);
}

.page-about .about-origin__media img {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  clip-path: var(--clip-corner);
}

@media (min-width: 860px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

/* ========== 档案展开 ========== */
.page-about .about-archive {
  margin-top: 48px;
  background: rgba(11, 61, 46, 0.06);
  border: 1px solid var(--about-hair);
  clip-path: var(--clip-corner-sm);
}

.page-about .about-archive__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-archive__label {
  font-size: 13px;
  font-weight: 800;
  color: var(--hot-red);
}

.page-about .about-archive__text {
  font-weight: 800;
  color: var(--charcoal);
}

.page-about .about-archive__icon {
  margin-left: auto;
  width: 20px;
  height: 20px;
  position: relative;
  flex: 0 0 auto;
}

.page-about .about-archive__icon::before,
.page-about .about-archive__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 2px;
  background: var(--charcoal);
  transform: translate(-50%, -50%);
  transition: transform 0.25s ease;
}

.page-about .about-archive__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-about .about-archive[open] .about-archive__icon::after {
  transform: translate(-50%, -50%) rotate(0);
}

.page-about .about-archive__body {
  padding: 0 20px 22px;
  border-top: 1px dashed var(--about-hair);
}

.page-about .about-archive__body p {
  line-height: 1.8;
  color: var(--rock-gray);
  margin: 14px 0 0;
}

/* ========== 02 演进 ========== */
.page-about .about-development {
  position: relative;
  overflow: hidden;
  padding-top: 76px;
  padding-bottom: 84px;
  background-color: var(--deep-bluegreen);
  background-image:
    radial-gradient(circle at 84% 12%, rgba(217, 255, 63, 0.12) 0 80px, transparent 81px),
    repeating-linear-gradient(112deg, rgba(217, 255, 63, 0.05) 0 1px, transparent 1px 18px),
    repeating-linear-gradient(15deg, rgba(11, 61, 46, 0.45) 0 1px, transparent 1px 30px);
}

.page-about .about-development .section-title,
.page-about .about-development h3 {
  color: var(--cream);
}

.page-about .about-timeline {
  list-style: none;
  margin: 42px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 38px 38px;
  border-left: 1px solid rgba(217, 255, 63, 0.3);
}

.page-about .about-timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 13px;
  height: 13px;
  background: var(--fluoro-yellow);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-about .about-timeline__year {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(217, 255, 63, 0.14);
  color: var(--fluoro-yellow);
  font-weight: 800;
  clip-path: var(--clip-corner-sm);
  transition: background 0.28s ease, color 0.28s ease;
}

.page-about .about-timeline__item:hover .about-timeline__year {
  background: var(--fluoro-yellow);
  color: var(--charcoal);
}

.page-about .about-timeline h3 {
  margin: 12px 0 6px;
  font-size: 20px;
  line-height: 1.3;
}

.page-about .about-timeline p {
  margin: 0;
  max-width: 560px;
  color: rgba(214, 240, 226, 0.68);
  line-height: 1.7;
}

.page-about .about-development__note {
  margin-top: 42px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  background: rgba(11, 61, 46, 0.38);
  padding: 18px 20px;
  clip-path: var(--clip-corner-sm);
}

.page-about .about-development__note p {
  margin: 0;
  flex: 1 1 260px;
  color: rgba(214, 240, 226, 0.8);
  line-height: 1.7;
  font-size: 14px;
}

/* ========== 03 覆盖 ========== */
.page-about .about-coverage {
  padding-top: 72px;
  padding-bottom: 84px;
}

.page-about .about-coverage__layout {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-coverage__map {
  margin: 0;
  position: relative;
}

.page-about .about-coverage__map::before {
  content: "";
  position: absolute;
  inset: -12px -12px 12px 12px;
  background: var(--deep-bluegreen);
  clip-path: var(--clip-corner);
  z-index: 0;
}

.page-about .about-coverage__map img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  clip-path: var(--clip-corner);
}

.page-about .about-coverage__metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-metric {
  padding: 22px;
  clip-path: var(--clip-corner);
}

.page-about .about-metric--lime {
  background: var(--lime);
  color: var(--charcoal);
}

.page-about .about-metric--yellow {
  background: var(--fluoro-yellow);
  color: var(--charcoal);
}

.page-about .about-metric--dark {
  background: var(--charcoal);
  color: var(--cream);
}

.page-about .about-metric__key {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  font-weight: 700;
  opacity: 0.7;
  margin-bottom: 4px;
}

.page-about .about-metric__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 800;
  line-height: 1.2;
}

.page-about .about-metric__desc {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.5;
  opacity: 0.8;
}

.page-about .about-coverage__para {
  margin-top: 30px;
  padding-left: 18px;
  border-left: 4px solid var(--earth-brown);
  color: var(--rock-gray);
  line-height: 1.85;
}

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

@media (min-width: 960px) {
  .page-about .about-coverage__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

/* ========== 04 合作与认证 ========== */
.page-about .about-credentials {
  padding-top: 76px;
  padding-bottom: 88px;
}

.page-about .about-credentials__grid {
  display: grid;
  gap: 20px;
  margin-top: 36px;
}

.page-about .about-credential {
  position: relative;
  background: rgba(253, 249, 238, 0.05);
  padding: 26px 24px;
  clip-path: var(--clip-corner);
  border: 1px solid rgba(253, 249, 238, 0.08);
  transition: transform 0.25s ease, background 0.25s ease;
}

.page-about .about-credential:hover {
  transform: translateY(-4px);
  background: rgba(217, 255, 63, 0.08);
}

.page-about .about-credential__index {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  color: var(--lime);
  margin-bottom: 14px;
  letter-spacing: 0.1em;
}

.page-about .about-credential h3 {
  margin: 0 0 10px;
  color: var(--cream);
  font-size: 19px;
}

.page-about .about-credential p {
  margin: 0;
  color: rgba(214, 240, 226, 0.7);
  line-height: 1.75;
  font-size: 14px;
}

.page-about .about-credentials__more {
  margin-top: 24px;
  font-size: 14px;
  color: rgba(214, 240, 226, 0.7);
}

.page-about .about-credentials__more a {
  color: var(--fluoro-yellow);
  text-decoration: underline;
  text-underline-offset: 4px;
}

@media (min-width: 860px) {
  .page-about .about-credentials__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ========== 05 团队与理念 ========== */
.page-about .about-team {
  padding-top: 76px;
  padding-bottom: 84px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-team__media {
  margin: 0;
  position: relative;
}

.page-about .about-team__media::before {
  content: "";
  position: absolute;
  inset: -14px -14px 14px 14px;
  background: var(--lime);
  z-index: 0;
  clip-path: var(--clip-corner);
}

.page-about .about-team__media img {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  clip-path: var(--clip-corner);
}

.page-about .about-team__text p {
  line-height: 1.85;
  margin-bottom: 16px;
  color: var(--rock-gray);
}

.page-about .about-team__principles {
  margin: 20px 0 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-team__contact {
  font-size: 14px;
}

.page-about .about-team__contact a {
  color: var(--prairie-green);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

/* ========== 收尾 ========== */
.page-about .about-outro {
  position: relative;
  overflow: hidden;
  background: var(--charcoal);
  padding: 72px 0;
  text-align: center;
}

.page-about .about-outro::before {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  top: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--prairie-green) 0%, var(--fluoro-yellow) 45%, var(--hot-red) 70%, var(--lime) 100%);
  transform: skewX(-12deg);
}

.page-about .about-outro__catch {
  margin: 0 auto 30px;
  max-width: 720px;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.4;
  font-weight: 900;
  color: var(--cream);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.page-about .about-outro__note {
  margin-top: 22px;
  font-size: 13px;
  color: rgba(214, 240, 226, 0.56);
}

.page-about .about-outro__note a {
  color: var(--fluoro-yellow);
  text-decoration: underline;
  text-underline-offset: 4px;
}