.page-about {
  --about-num-col: 96px;
  --about-body-text: #c9d8f0;
  --about-line-soft: rgba(36, 64, 111, 0.6);
  position: relative;
  background: var(--ink-900);
  color: var(--white);
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  padding: 28px 0 0;
  background-image: var(--grad-lamp);
  background-repeat: no-repeat;
  background-position: 0 0;
  background-size: 100% 620px;
}

.page-about .about-hero::after {
  content: "2019";
  position: absolute;
  right: -6px;
  bottom: -18px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(110px, 20vw, 300px);
  line-height: 0.78;
  letter-spacing: -0.04em;
  color: rgba(43, 230, 214, 0.06);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

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

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: 14px;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .kicker-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.22);
  flex: none;
}

.page-about .about-title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 9.2vw, 106px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-lede {
  max-width: 56ch;
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body-text);
}

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

.page-about .about-hero-aside {
  display: none;
}

.page-about .side-note {
  writing-mode: vertical-rl;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-banner {
  position: relative;
  margin: 38px 0 0;
  border: var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-banner figcaption {
  padding: 14px 18px 16px;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-top: var(--border-thin);
  background: var(--ink-800);
}

.page-about .about-section {
  position: relative;
  margin-top: 52px;
  padding-top: 44px;
  border-top: var(--border-thin);
}

.page-about .about-section-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-rail {
  display: flex;
  align-items: flex-start;
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(42px, 6vw, 72px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: transparent;
  -webkit-text-stroke: 2px var(--cyan);
}

.page-about .chapter-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body-text);
  max-width: 62ch;
}

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

.page-about .about-intro {
  color: var(--muted) !important;
}

.page-about .about-note-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-top: 24px;
  padding: 14px 18px;
  border: var(--border-thin);
  border-left: 6px solid var(--cyan);
  border-radius: 12px;
  background: var(--ink-800);
}

.page-about .about-note-label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-note-link {
  color: var(--white);
  font-size: 15px;
  line-height: 1.7;
  text-decoration: none;
  border-bottom: 2px solid var(--line);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-note-link:hover,
.page-about .about-note-link:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan);
  outline: none;
}

/* ---------- 时间轴 ---------- */

.page-about .stage-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 4px 0 30px;
}

.page-about .stage-jump a {
  display: inline-block;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border: var(--border-thin);
  border-radius: var(--radius-pill);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .stage-jump a:hover,
.page-about .stage-jump a:focus-visible {
  border-color: var(--cyan);
  background: rgba(43, 230, 214, 0.12);
  outline: none;
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 58%, rgba(36, 64, 111, 0) 100%);
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: 32px;
  scroll-margin-top: 120px;
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 230, 214, 0.16);
}

.page-about .timeline-item--current::before {
  left: -41px;
  top: 4px;
  width: 18px;
  height: 18px;
  background: var(--orange);
  box-shadow: 0 0 0 6px rgba(255, 122, 47, 0.18);
}

.page-about .timeline-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px !important;
}

.page-about .timeline-ver {
  display: inline-block;
  padding: 3px 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 6px;
}

.page-about .timeline-item--current .timeline-ver {
  background: var(--orange);
}

.page-about .timeline-phase {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .timeline-title {
  margin: 0 0 10px;
  font-family: var(--font-heading, var(--font-display));
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .timeline-text {
  margin: 0 0 10px !important;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body-text);
}

.page-about .timeline-shift {
  margin: 0 !important;
  padding: 10px 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cyan-soft);
  background: var(--ink-800);
  border-left: 3px solid var(--line);
  border-radius: 0 10px 10px 0;
}

.page-about .shift-arrow {
  margin-right: 6px;
  color: var(--orange);
}

/* ---------- 流程 ---------- */

.page-about .flow-tabs {
  margin: 6px 0 24px;
}

.page-about .flow-panels {
  border: var(--border);
  border-radius: var(--radius-card);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard-sm);
  overflow: hidden;
}

.page-about .flow-panel {
  padding: 24px 20px 26px;
  border-bottom: var(--border-thin);
}

.page-about .flow-panel:last-child {
  border-bottom: 0;
}

.page-about .flow-step {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .flow-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-about .flow-text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body-text);
}

.page-about .flow-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .flow-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .flow-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.page-about .flow-figure {
  margin: 30px 0 0;
  border: var(--border);
  border-radius: var(--radius-card);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .flow-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .flow-figure figcaption {
  padding: 13px 18px 15px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  border-top: var(--border-thin);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 6px;
}

.page-about .team-card {
  padding: 22px 20px 24px;
  border: var(--border);
  border-radius: var(--radius-card);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard-sm);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-4px);
  box-shadow: 3px 3px 0 rgba(36, 64, 111, 0.9);
  border-color: var(--cyan);
}

.page-about .team-card--b {
  border-color: var(--line);
}

.page-about .team-num {
  margin: 0 0 6px;
  font-size: clamp(40px, 8vw, 60px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .team-card--b .team-num {
  color: var(--orange);
}

.page-about .team-card--c .team-num {
  color: var(--cyan-soft);
}

.page-about .team-role {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body-text);
}

.page-about .team-rhythm {
  margin-top: 26px;
  padding: 20px;
  border: var(--border-thin);
  border-radius: var(--radius-card);
  background: var(--ink-700);
}

.page-about .team-rhythm-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .team-rhythm p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body-text);
}

/* ---------- 覆盖规模 ---------- */

.page-about .reach-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 6px 0 22px;
}

.page-about .reach-item {
  padding: 16px 14px 18px;
  border: var(--border-thin);
  border-radius: 14px;
  background: var(--ink-700);
}

.page-about .reach-item:nth-child(3n + 1) {
  border-top: 4px solid var(--cyan);
}

.page-about .reach-item:nth-child(3n + 2) {
  border-top: 4px solid var(--orange);
}

.page-about .reach-item:nth-child(3n + 3) {
  border-top: 4px solid var(--line);
}

.page-about .reach-value {
  margin: 0 0 6px;
  font-size: clamp(30px, 6.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.page-about .reach-unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--cyan);
}

.page-about .reach-label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .reach-note {
  font-size: 15px !important;
  line-height: 1.85;
  color: var(--about-body-text);
}

.page-about .reach-figure {
  margin: 26px 0 0;
  border: var(--border);
  border-radius: var(--radius-card);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .reach-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1100 / 730;
  object-fit: cover;
}

.page-about .reach-figure figcaption {
  padding: 13px 18px 15px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  border-top: var(--border-thin);
}

/* ---------- 合作 ---------- */

.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 6px 0 24px;
}

.page-about .partner-card {
  padding: 22px 20px 24px;
  border: var(--border);
  border-radius: var(--radius-card);
  background: var(--ink-800);
}

.page-about .partner-card:first-child {
  box-shadow: var(--shadow-hard-sm);
}

.page-about .partner-card:last-child {
  border-color: var(--orange);
}

.page-about .partner-title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body-text);
}

.page-about .partner-honor {
  display: grid;
  gap: 12px;
  padding: 20px;
  border-left: 6px solid var(--orange);
  border-radius: 0 14px 14px 0;
  background: var(--ink-700);
}

.page-about .honor-line {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body-text);
}

.page-about .honor-key {
  display: inline-block;
  margin-right: 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .honor-line a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid var(--line);
}

.page-about .honor-line a:hover,
.page-about .honor-line a:focus-visible {
  border-bottom-color: var(--cyan);
  outline: none;
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  margin-top: 60px;
  padding: 42px 0 50px;
  background-image: var(--grad-night);
  border-top: var(--border);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-cta-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body-text);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .reach-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .flow-panel {
    padding: 28px 26px 30px;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-num-col: 110px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 9fr) 110px;
    gap: 44px;
    align-items: start;
    padding-top: 22px;
  }

  .page-about .about-hero-aside {
    display: block;
    padding-top: 6px;
  }

  .page-about .about-lede {
    font-size: 18px;
    max-width: 52ch;
  }

  .page-about .about-banner {
    margin-top: 46px;
  }

  .page-about .about-section {
    margin-top: 72px;
    padding-top: 58px;
  }

  .page-about .about-section-inner {
    grid-template-columns: var(--about-num-col) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 120px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .team-card--a {
    margin-top: 0;
  }

  .page-about .team-card--b {
    margin-top: 26px;
  }

  .page-about .team-card--c {
    margin-top: 52px;
  }

  .page-about .about-cta {
    margin-top: 88px;
    padding: 62px 0 68px;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }

  .page-about .about-cta-links {
    justify-content: flex-end;
  }
}

@media (min-width: 1120px) {
  .page-about .flow-panels {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .flow-panel {
    padding: 32px 34px 34px;
  }
}

.page-about {
  --font-heading: inherit;
}