.page-about {
  --ab-line: rgba(143, 163, 178, 0.22);
  --ab-line-strong: rgba(143, 163, 178, 0.4);
  --ab-gap: clamp(16px, 3vw, 32px);
  --ab-rad: 18px;
  --ab-panel: rgba(11, 43, 60, 0.58);
  background:
    radial-gradient(120% 55% at 84% 0%, rgba(24, 224, 208, 0.1), transparent 62%),
    linear-gradient(180deg, #041C2C 0%, #062231 50%, #041C2C 100%);
  color: var(--c-white);
  padding-bottom: clamp(40px, 7vw, 88px);
  font-family: var(--font-body);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(18px, 3.5vw, 30px);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--c-steel);
}

.page-about .breadcrumb a {
  color: var(--c-steel);
  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(--c-cyan);
  border-bottom-color: var(--c-coral);
}

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

.page-about .breadcrumb__sep {
  color: var(--c-reef);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  padding-top: clamp(20px, 3.6vw, 40px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.95rem, 6.2vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: clamp(0.94rem, 1.6vw, 1.04rem);
  line-height: 1.88;
  color: #C9D8E2;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__visual {
  position: relative;
  padding: clamp(10px, 2vw, 18px);
  border: 1px solid var(--ab-line);
  border-radius: 24px;
  background:
    radial-gradient(90% 80% at 72% 8%, rgba(24, 224, 208, 0.14), transparent 70%),
    #06202E;
  box-shadow: 0 24px 60px rgba(2, 12, 20, 0.45);
}

.page-about .about-hero__art {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 统计刻度 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin-top: clamp(26px, 4.6vw, 52px);
  border: 1px solid var(--ab-line);
  border-radius: var(--ab-rad);
  overflow: hidden;
  background: var(--ab-line);
}

.page-about .stat {
  padding: clamp(16px, 2.6vw, 24px);
  background: #071F2C;
}

.page-about .stat__num {
  margin: 0;
  font-size: clamp(1.42rem, 3.4vw, 1.95rem);
  line-height: 1.1;
  color: var(--c-cyan);
  letter-spacing: -0.01em;
}

.page-about .stat__label {
  margin: 8px 0 14px;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--c-steel);
}

.page-about .stat__bar {
  display: block;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-cyan), rgba(24, 224, 208, 0.1));
}

.page-about .about-stats > :nth-child(1) .stat__bar { width: 92%; }
.page-about .about-stats > :nth-child(2) .stat__bar { width: 68%; }
.page-about .about-stats > :nth-child(3) .stat__bar { width: 80%; }
.page-about .about-stats > :nth-child(4) .stat__bar { width: 46%; }

/* ---------- 章节头 ---------- */
.page-about .about-sec {
  margin-top: clamp(34px, 5.5vw, 70px);
}

.page-about .section-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 3.2vw, 34px);
  padding-top: clamp(22px, 3.4vw, 34px);
  border-top: 1px solid var(--ab-line);
}

.page-about .section-num {
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--c-cyan);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.2vw, 2.05rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-about .section-note {
  margin: 0;
  max-width: 44em;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--c-steel);
}

/* ---------- 01 起点 ---------- */
.page-about .origin {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .origin__figure {
  margin: 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--ab-rad);
  overflow: hidden;
  background: #06202E;
}

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

.page-about .origin__panel.panel--paper {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  border-radius: var(--ab-rad);
  background: var(--c-paper);
  color: var(--c-ink);
  box-shadow: 0 18px 44px rgba(2, 12, 20, 0.35);
}

.page-about .origin__panel.panel--paper::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-top: 26px solid rgba(4, 28, 44, 0.09);
  border-left: 26px solid transparent;
}

.page-about .origin__tag {
  margin: 0 0 14px;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--c-coral);
}

.page-about .origin__panel p {
  margin: 0 0 14px;
  font-size: 0.95rem;
  line-height: 1.88;
  color: #16323F;
}

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

/* ---------- 02 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 28px) 26px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(24, 224, 208, 0.5), rgba(143, 163, 178, 0.1));
}

.page-about .tl__item:last-child::before {
  display: none;
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(24, 224, 208, 0.12);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl__item:hover::after {
  background: var(--c-coral);
  box-shadow: 0 0 0 5px rgba(255, 106, 69, 0.16);
}

.page-about .tl__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.page-about .tl__body {
  padding: 14px 16px 16px;
  border: 1px solid var(--ab-line);
  border-radius: 14px;
  background: var(--ab-panel);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl__item:hover .tl__body {
  border-color: rgba(24, 224, 208, 0.55);
  background: rgba(11, 43, 60, 0.9);
}

.page-about .tl__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .tl__body p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 03 专题 ---------- */
.page-about .topics {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .topic {
  padding: 18px;
  border: 1px solid var(--ab-line);
  border-radius: 14px;
  background: var(--ab-panel);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .topic:hover {
  border-color: rgba(24, 224, 208, 0.5);
  background: rgba(11, 43, 60, 0.88);
}

.page-about .topic__id {
  margin: 0 0 6px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--c-steel);
}

.page-about .topic h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  color: var(--c-white);
}

.page-about .topic p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .topic .topic__id {
  color: var(--c-cyan);
}

/* ---------- 04 团队 ---------- */
.page-about .team {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .team__figure {
  margin: 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--ab-rad);
  overflow: hidden;
  background: #06202E;
}

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

.page-about .team__cap {
  display: block;
  padding: 10px 14px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--c-steel);
  background: rgba(11, 43, 60, 0.85);
  border-top: 1px solid var(--ab-line);
}

.page-about .tdoc {
  margin-bottom: 10px;
  border: 1px solid var(--ab-line);
  border-radius: 12px;
  background: rgba(11, 43, 60, 0.52);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease);
}

.page-about .tdoc:hover,
.page-about .tdoc[open] {
  border-color: rgba(24, 224, 208, 0.45);
}

.page-about .tdoc summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--c-white);
}

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

.page-about .tdoc summary::marker {
  content: "";
}

.page-about .tdoc summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .tdoc[open] summary::after {
  content: "\2013";
  color: var(--c-coral);
}

.page-about .tdoc summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-about .tdoc__num {
  min-width: 20px;
  font-size: 0.74rem;
  color: var(--c-steel);
}

.page-about .tdoc__body {
  padding: 0 16px 16px;
  font-size: 0.89rem;
  line-height: 1.82;
  color: var(--c-mist);
}

/* ---------- 05 质量 ---------- */
.page-about .steps {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .step {
  padding-top: 14px;
  border-top: 2px solid rgba(24, 224, 208, 0.35);
}

.page-about .step__num {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .step h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .step p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .quality__note.panel--flat {
  margin-top: clamp(20px, 3.2vw, 30px);
  padding: clamp(18px, 2.8vw, 26px);
  border: 1px dashed rgba(143, 163, 178, 0.34);
  border-radius: 16px;
  background: rgba(11, 43, 60, 0.32);
}

.page-about .quality__lead {
  margin: 0 0 14px;
  font-size: 0.9rem;
  color: var(--c-paper);
}

.page-about .mech {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}

.page-about .mech__item {
  padding: 7px 15px;
  border: 1px solid rgba(24, 224, 208, 0.38);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-cyan);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .mech__item:hover {
  background: rgba(24, 224, 208, 0.14);
}

.page-about .quality__more {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 06 覆盖与联系 ---------- */
.page-about .reach {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .reach__text {
  margin: 0 0 14px;
  font-size: 0.94rem;
  line-height: 1.88;
  color: var(--c-mist);
}

.page-about .reach__text a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(24, 224, 208, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .reach__text a:hover {
  color: var(--c-coral);
  border-bottom-color: var(--c-coral);
}

.page-about .reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .reach__card {
  padding: clamp(18px, 2.8vw, 28px);
  border: 1px solid var(--ab-line);
  border-radius: var(--ab-rad);
  background: var(--ab-panel);
}

.page-about .reach__key {
  margin: 0 0 4px;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .reach__key:not(:first-child) {
  margin-top: 16px;
}

.page-about .reach__val {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--c-white);
  word-break: break-word;
}

.page-about .reach__hint {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--ab-line);
  font-size: 0.82rem;
  line-height: 1.78;
  color: var(--c-steel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .topics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .origin {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .team {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .reach {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .section-head {
    grid-template-columns: 86px minmax(0, 1fr);
    grid-template-areas:
      "num title"
      "num note";
    column-gap: 22px;
    row-gap: 8px;
  }

  .page-about .section-num {
    grid-area: num;
    padding-top: 8px;
  }

  .page-about .section-title {
    grid-area: title;
  }

  .page-about .section-note {
    grid-area: note;
  }
}

@media (min-width: 1000px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .topics {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .topic:nth-child(1) { grid-column: span 7; }
  .page-about .topic:nth-child(2) { grid-column: span 5; }
  .page-about .topic:nth-child(3) { grid-column: span 5; }
  .page-about .topic:nth-child(4) { grid-column: span 7; }
  .page-about .topic:nth-child(5) { grid-column: span 6; }
  .page-about .topic:nth-child(6) { grid-column: span 6; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}

已在上方输出。