.page-about {
  display: block;
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-block: 1.5rem 0.5rem;
  font-size: 0.82rem;
  color: var(--dim);
  letter-spacing: 0.02em;
}

.page-about .breadcrumb a {
  color: var(--cal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .crumb-sep {
  margin-inline: 0.5rem;
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.8rem, 4.5vw, 3.4rem) clamp(2.6rem, 6vw, 4.6rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 6% 0%, rgba(53, 224, 214, 0.1), transparent 58%),
    radial-gradient(90% 85% at 100% 10%, rgba(255, 138, 61, 0.07), transparent 62%);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 4vw, 2.6rem);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 5.4vw, 3.7rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 0.75rem 0 0;
}

.page-about .about-lede {
  margin: 1.35rem 0 0;
  max-width: 60ch;
  font-size: 1.03rem;
  line-height: 1.82;
  color: var(--body-text);
  font-family: var(--font-body);
}

.page-about .about-badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  margin: 1.7rem 0 0;
}

/* 概况面板 */
.page-about .about-facts {
  padding: clamp(1.25rem, 3vw, 1.8rem);
  border-radius: 4px;
}

.page-about .fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .fact-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.28rem;
  padding-bottom: 0.95rem;
  border-bottom: 1px solid var(--line);
}

.page-about .fact-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .fact-value {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3.6vw, 2.05rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.page-about .fact-label {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--cal);
}

/* ---------- 章节头 ---------- */
.page-about .about-sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem 1.1rem;
  align-items: start;
  margin-bottom: clamp(1.4rem, 3.5vw, 2.2rem);
}

.page-about .about-sec-lede {
  margin: 0.65rem 0 0;
  max-width: 66ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--cal);
}

/* ---------- 章节配图 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(1.8rem, 4vw, 2.8rem);
  border-radius: 4px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 1.6rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 224, 214, 0.6), rgba(53, 224, 214, 0.12) 72%, transparent);
}

.page-about .tl-item {
  position: relative;
  padding-left: 2.1rem;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0.5px;
  top: 0.85rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 214, 0.12);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3.6vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--white);
  margin-bottom: 0.6rem;
}

.page-about .tl-item:nth-child(2) .tl-year {
  color: var(--cyan);
}

.page-about .tl-card {
  padding: clamp(1rem, 2.6vw, 1.4rem);
  border-radius: 3px;
}

.page-about .tl-title {
  margin: 0 0 0.55rem;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
  font-family: var(--font-body);
}

.page-about .tl-text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--body-text);
}

/* ---------- 四步流程 ---------- */
.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.35rem;
}

.page-about .flow-step {
  position: relative;
  padding: 1.45rem 1.05rem 1.15rem;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(12, 35, 51, 0.82), rgba(6, 23, 36, 0) 78%);
  transition: border-color var(--dur) var(--ease);
}

.page-about .flow-step::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--cyan);
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .flow-step:hover,
.page-about .flow-step:focus-within {
  border-top-color: var(--cyan);
}

.page-about .flow-step:hover::after,
.page-about .flow-step:focus-within::after {
  width: 100%;
  background: var(--orange);
}

.page-about .flow-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 0.55rem;
}

.page-about .flow-title {
  margin: 0 0 0.5rem;
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
  font-family: var(--font-body);
}

.page-about .flow-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .flow-extra {
  margin: 0.7rem 0 0;
  font-size: 0.81rem;
  line-height: 1.72;
  color: var(--dim);
  transition: color var(--dur) var(--ease);
}

.page-about .flow-step:hover .flow-extra,
.page-about .flow-step:focus-within .flow-extra {
  color: var(--cal);
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 2.6rem);
  align-items: center;
}

.page-about .team-figure {
  margin: 0;
  border-radius: 4px;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .team-panel {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2rem);
}

.page-about .team-ring {
  width: min(230px, 62vw);
  aspect-ratio: 1;
  margin-inline: auto;
  border-radius: 50%;
  position: relative;
  background: conic-gradient(
    from -90deg,
    var(--cyan) 0 39.29%,
    var(--orange) 39.29% 71.43%,
    var(--magenta) 71.43% 89.29%,
    var(--cal) 89.29% 100%
  );
  box-shadow: 0 0 0 1px var(--line), 0 0 42px rgba(53, 224, 214, 0.12);
}

.page-about .team-ring::after {
  content: "28";
  position: absolute;
  inset: 24%;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 6vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .team-legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: 0.85rem;
  padding: 0.85rem 0.9rem 0.9rem 0;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .team-legend li:hover,
.page-about .team-legend li:focus-within {
  border-bottom-color: var(--cyan);
  padding-left: 0.55rem;
}

.page-about .team-legend li::before {
  content: "";
  width: 12px;
  height: 12px;
  border-radius: 2px;
  margin-top: 0.3rem;
  background: var(--dot, var(--cyan));
}

.page-about .team-legend li:nth-child(1) { --dot: var(--cyan); }
.page-about .team-legend li:nth-child(2) { --dot: var(--orange); }
.page-about .team-legend li:nth-child(3) { --dot: var(--magenta); }
.page-about .team-legend li:nth-child(4) { --dot: var(--cal); }

.page-about .team-body {
  min-width: 0;
}

.page-about .team-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.9rem;
  margin: 0 0 0.35rem;
}

.page-about .team-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .team-desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--body-text);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.4rem);
}

.page-about .cadence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
  align-content: start;
}

.page-about .cadence-list li {
  display: grid;
  gap: 0.3rem;
  padding-left: 0.95rem;
  border-left: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.page-about .cadence-list li:hover {
  border-left-color: var(--orange);
}

.page-about .cadence-value {
  font-family: var(--font-mono);
  font-size: 1.22rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.page-about .cadence-text {
  font-size: 0.87rem;
  line-height: 1.72;
  color: var(--cal);
}

/* 更新日志折叠 */
.page-about .log-list {
  display: grid;
  gap: 0.6rem;
  align-content: start;
}

.page-about .log-row {
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(20, 48, 63, 0.34);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease);
}

.page-about .log-row:hover {
  border-color: var(--cyan);
}

.page-about .log-toggle {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.85rem;
  padding: 0.9rem 1rem;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

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

.page-about .log-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border: 1px solid rgba(53, 224, 214, 0.4);
  border-radius: 2px;
  padding: 0.12rem 0.42rem;
  white-space: nowrap;
}

.page-about .log-name {
  flex: 1 1 12rem;
  min-width: 0;
  font-size: 0.93rem;
  line-height: 1.65;
  color: var(--white);
}

.page-about .log-when {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--dim);
  white-space: nowrap;
}

.page-about .log-panel {
  padding: 0.85rem 1rem 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--cal);
}

.page-about .log-panel p {
  margin: 0;
}

.page-about .log-panel[hidden] {
  display: none;
}

/* ---------- 技术合作与体验改造 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .partner-card {
  padding: clamp(1.25rem, 3vw, 2rem);
  border-radius: 4px;
}

.page-about .partner-title {
  margin: 0.9rem 0 0.8rem;
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2.6vw, 1.55rem);
  font-weight: 600;
  line-height: 1.42;
  color: var(--white);
}

.page-about .partner-text {
  margin: 0 0 0.85rem;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--body-text);
}

.page-about .partner-text:last-child {
  margin-bottom: 0;
}

/* ---------- 结尾指引 ---------- */
.page-about .about-cta {
  margin-top: clamp(2.4rem, 6vw, 4rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: 4px;
  background: linear-gradient(135deg, rgba(53, 224, 214, 0.1), rgba(255, 138, 61, 0.07) 58%, rgba(6, 23, 36, 0) 100%);
}

.page-about .about-cta-text {
  margin: 0.9rem 0 0;
  max-width: 68ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--body-text);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 780px) {
  .page-about .flow-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.15rem;
  }

  .page-about .flow-step {
    padding: 1.5rem 1.1rem 1.2rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    gap: 2.3rem;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-0.5px);
  }

  .page-about .tl-item {
    width: calc(50% - 3rem);
    padding-left: 0;
  }

  .page-about .tl-item:nth-child(odd) {
    justify-self: start;
  }

  .page-about .tl-item:nth-child(even) {
    justify-self: end;
  }

  .page-about .tl-item::before {
    top: 1.15rem;
  }

  .page-about .tl-item:nth-child(odd)::before {
    left: auto;
    right: -3.35rem;
  }

  .page-about .tl-item:nth-child(even)::before {
    left: -3.35rem;
    right: auto;
  }

  .page-about .cadence-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(2rem, 4.5vw, 3.2rem);
  }
}

@media (min-width: 880px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(2rem, 5vw, 3.4rem);
    align-items: center;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-facts {
    margin-bottom: 0.2rem;
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

@media (max-width: 520px) {
  .page-about .log-when {
    margin-left: 0;
    width: 100%;
  }

  .page-about .about-badges .tag {
    font-size: 0.72rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}
<<<END>>>