.page-about {
  --about-line: rgba(184, 196, 212, 0.16);
  --about-line-strong: rgba(184, 196, 212, 0.34);
  position: relative;
  background-color: var(--ink-0);
  color: var(--silver);
  font-family: var(--font-body);
  overflow-x: hidden;
  padding-top: clamp(2rem, 6vw, 3.5rem);
}

.page-about a {
  color: var(--cyan);
}

.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(0.5rem, 2vw, 1.25rem) 0 clamp(1.75rem, 4.5vw, 3rem);
  background:
    radial-gradient(115% 110% at 84% -14%, rgba(41, 230, 255, 0.17) 0%, rgba(5, 11, 20, 0) 60%),
    radial-gradient(75% 85% at -8% -6%, rgba(255, 122, 26, 0.11) 0%, rgba(5, 11, 20, 0) 55%),
    linear-gradient(180deg, var(--ink-1) 0%, var(--ink-0) 80%);
  border-bottom: 1px solid var(--about-line-strong);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(52%, 520px);
  height: 1px;
  background: linear-gradient(90deg, rgba(41, 230, 255, 0), var(--cyan));
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(38%, 300px);
  height: 3px;
  background: linear-gradient(90deg, rgba(255, 122, 26, 0), var(--orange));
  transform: skewX(-26deg);
  transform-origin: right bottom;
  z-index: 0;
}

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

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0 0 clamp(1.5rem, 4vw, 2.6rem);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--silver);
}

.page-about .about-crumb a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .about-crumb a:hover {
  text-decoration: underline;
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--paper);
}

.page-about .about-eyebrow {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.05rem, 5.6vw, 3.9rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: #eaf2ff;
}

.page-about .about-lede {
  margin: clamp(1.1rem, 3vw, 1.6rem) 0 0;
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-metrics {
  list-style: none;
  margin: clamp(1.75rem, 4.5vw, 2.75rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line-strong);
  border-bottom: 1px solid var(--about-line-strong);
}

.page-about .about-metrics li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.9rem 0.85rem;
  background: var(--ink-0);
}

.page-about .metric-num {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .metric-label {
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--silver);
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  padding: clamp(2.5rem, 6.5vw, 5rem) 0;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--about-line);
}

.page-about .about-section-lede {
  margin: 0.9rem 0 0;
  max-width: 60ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-figure {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
}

.page-about .about-figure-media,
.page-about .about-figure .img-frame {
  border: 1px solid var(--about-line-strong);
}

.page-about .fig-caption {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--silver);
  opacity: 0.8;
}

/* ---------- 起点与定位 ---------- */

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3.5vw, 2.5rem);
}

.page-about .about-margin {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .margin-year {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .margin-note {
  font-family: var(--font-mono);
  font-size: 0.69rem;
  letter-spacing: 0.16em;
  color: var(--silver);
  opacity: 0.8;
}

.page-about .about-origin-body .section-title {
  margin-top: 0.5rem;
}

.page-about .about-origin-body .prose p {
  margin: 0 0 1.05rem;
  font-size: clamp(0.96rem, 1.35vw, 1.04rem);
  line-height: 1.85;
}

.page-about .about-origin-body .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline .section-title {
  max-width: 22ch;
}

.page-about .timeline-list {
  position: relative;
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--steel) 58%, rgba(18, 59, 92, 0) 100%);
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 clamp(1.4rem, 3.5vw, 2rem) clamp(1.5rem, 4vw, 2.4rem);
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 2px solid var(--cyan);
}

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

.page-about .timeline-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .timeline-item h3 {
  margin: 0.3rem 0 0.4rem;
  font-size: clamp(1.02rem, 1.7vw, 1.18rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #eaf2ff;
}

.page-about .timeline-item p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  align-items: start;
}

.page-about .team-intro {
  margin: 0 0 1.1rem;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.3rem 0.75rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .team-row .meter {
  grid-column: 1 / -1;
}

.page-about .team-row .meter-fill {
  background: linear-gradient(90deg, var(--cyan) 0%, var(--orange) 100%);
}

.page-about .team-name {
  font-size: 0.94rem;
  color: #eaf2ff;
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .team-foot {
  margin: 1.2rem 0 0;
  padding-top: 1rem;
  border-top: 1px dashed var(--about-line-strong);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 方法 ---------- */

.page-about .method-list {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(0.9rem, 2.5vw, 1.35rem);
}

.page-about .method-item {
  padding: 1.05rem 1.1rem 1.25rem;
  background: var(--ink-1);
  border-left: 2px solid var(--orange);
}

.page-about .method-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .method-item h3 {
  margin: 0.35rem 0 0.45rem;
  font-size: 1.04rem;
  font-weight: 700;
  color: #eaf2ff;
}

.page-about .method-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 合作生态 ---------- */

.page-about .partners-body {
  display: flex;
  flex-direction: column;
  gap: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line-strong);
  border-bottom: 1px solid var(--about-line-strong);
}

.page-about .partner-list li {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem 0.9rem;
  background: var(--ink-0);
}

.page-about .partner-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .partner-list h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  color: #eaf2ff;
}

.page-about .partner-list p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .partner-honor {
  margin: 0;
  padding: 1.05rem 1.15rem;
  background: var(--paper);
  color: #10202f;
  font-size: 0.9rem;
  line-height: 1.75;
  border-left: 3px solid var(--orange);
  transform: rotate(-0.6deg);
}

/* ---------- 服务范围 ---------- */

.page-about .reach-figures {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1rem, 3vw, 1.5rem);
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .reach-figure {
  padding: 1.25rem 1.2rem 1.35rem;
  border-top: 2px solid var(--cyan);
  background: linear-gradient(180deg, rgba(18, 59, 92, 0.5) 0%, rgba(5, 11, 20, 0) 100%);
}

.page-about .reach-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.95rem, 5vw, 2.8rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .reach-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.87rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .reach-uses {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line-strong);
}

.page-about .reach-uses li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.35rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .reach-use-name {
  font-size: 0.97rem;
  font-weight: 700;
  color: #eaf2ff;
}

.page-about .reach-use-text {
  font-size: 0.91rem;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .reach-use-link {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(41, 230, 255, 0.4);
  padding-bottom: 1px;
}

.page-about .reach-use-link:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 结尾 ---------- */

.page-about .about-close {
  padding: clamp(2.5rem, 6vw, 4.25rem) 0 clamp(3rem, 7vw, 5rem);
  border-top: 1px solid var(--about-line-strong);
  background:
    linear-gradient(135deg, rgba(18, 59, 92, 0.55) 0%, rgba(5, 11, 20, 0) 62%),
    var(--ink-1);
}

.page-about .about-close-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-close-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-close-title {
  margin: 0.45rem 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: #eaf2ff;
}

.page-about .about-close-text {
  margin: 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-self: end;
}

.page-about .about-close-links {
  list-style: none;
  margin: 0;
  padding: clamp(1rem, 2.5vw, 1.4rem) 0 0;
  border-top: 1px solid var(--about-line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.5rem;
}

.page-about .about-close-links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--silver);
  text-decoration: none;
}

.page-about .about-close-links a:hover {
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .reach-figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 800px) {
  .page-about .method-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .reach-uses li {
    grid-template-columns: 12.5rem minmax(0, 1fr) auto;
    align-items: baseline;
    gap: 1.25rem;
  }
}

@media (min-width: 880px) {
  .page-about .about-origin-grid {
    grid-template-columns: 9.5rem minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-margin {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.7rem;
  }

  .page-about .margin-note {
    writing-mode: vertical-rl;
    letter-spacing: 0.26em;
  }

  .page-about .about-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .partners-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  }

  .page-about .about-close-inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .about-close-links {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .partner-honor {
    transform: none;
  }
}