/* ===== 品牌总览 · page-about ===== */
.page-about {
  --about-rail: 190px;
  --about-data: 244px;
  --about-gap: clamp(20px, 3vw, 40px);
  --about-line: 1px solid var(--ink-700);

  background:
    radial-gradient(1100px 560px at 84% -8%, rgba(59, 216, 232, 0.07), transparent 62%),
    radial-gradient(760px 420px at 4% 18%, rgba(255, 107, 53, 0.05), transparent 68%),
    var(--ink-900);
  color: var(--paper);
  padding-block: clamp(18px, 3vw, 36px) clamp(56px, 8vw, 104px);
}

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

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

/* ---------- 左侧章节索引 ---------- */
.page-about .about-rail {
  min-width: 0;
  border-top: 2px solid var(--signal);
  padding-top: 14px;
}

.page-about .rail-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .rail-link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 8px 8px 10px;
  border-left: 2px solid transparent;
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.5;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: rgba(59, 216, 232, 0.07);
}

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

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

@media (max-width: 939px) {
  .page-about .rail-list {
    grid-auto-flow: column;
    grid-auto-columns: minmax(146px, auto);
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }
  .page-about .rail-link {
    white-space: nowrap;
  }
}

/* ---------- 中部叙事流 ---------- */
.page-about .about-stream {
  display: grid;
  gap: clamp(38px, 5vw, 72px);
  min-width: 0;
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  padding-bottom: clamp(24px, 3vw, 36px);
  border-bottom: var(--about-line);
}

.page-about .hero-eyebrow {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.85rem, 4.6vw, 3.15rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .hero-lede {
  margin: 16px 0 0;
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .hero-figure {
  margin: 0;
  position: relative;
  border: var(--about-line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .hero-figure::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 46px;
  background: var(--signal);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  z-index: 1;
}

.page-about .hero-figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .hero-stats {
  grid-column: 1 / -1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-700);
  border: var(--about-line);
}

.page-about .hero-stat {
  background: var(--ink-800);
  padding: 13px 15px;
  display: grid;
  gap: 3px;
}

.page-about .hero-stat b {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--paper);
}

.page-about .hero-stat span {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

@media (min-width: 620px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
  .page-about .hero-copy {
    padding-top: 6px;
  }
}

/* 章节通用 */
.page-about .about-section {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  scroll-margin-top: calc(var(--head-h) + 28px);
}

.page-about .sec-head {
  display: grid;
  gap: 8px;
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 2.7vw, 2rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 24ch;
}

.page-about .about-section p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
  max-width: 68ch;
}

.page-about .about-section p strong {
  color: var(--paper);
  font-weight: 600;
}

/* 阶段轴 */
.page-about .stage-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--ink-700);
  display: grid;
  gap: 10px;
}

.page-about .stage-item {
  position: relative;
}

.page-about .stage-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 15px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(111, 227, 193, 0.16);
}

.page-about .stage {
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .stage:hover,
.page-about .stage:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .stage[open] {
  border-color: var(--ink-700);
  background: var(--ink-950);
}

.page-about .stage summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .stage-phase {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
  border: 1px solid rgba(214, 168, 75, 0.4);
  padding: 2px 6px;
}

.page-about .stage-title {
  flex: 1 1 200px;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  line-height: 1.5;
}

.page-about .stage-hint {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .stage-hint::before {
  content: "+";
}

.page-about .stage[open] .stage-hint::before {
  content: "−";
}

.page-about .stage-body {
  padding: 12px 16px 16px;
  border-top: 1px dashed var(--ink-700);
}

.page-about .stage-body p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* 认证 */
.page-about .cert-grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .cert-facts {
  margin: 18px 0 0;
  display: grid;
  border-top: var(--about-line);
}

.page-about .cert-facts > div {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 14px;
  padding: 10px 0;
  border-bottom: var(--about-line);
}

.page-about .cert-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
  padding-top: 3px;
}

.page-about .cert-facts dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--paper);
}

.page-about .cert-figure {
  margin: 0;
  border: 1px solid rgba(214, 168, 75, 0.45);
  background:
    radial-gradient(320px 320px at 50% 30%, rgba(214, 168, 75, 0.12), transparent 70%),
    var(--ink-800);
  padding: 10px;
}

.page-about .cert-figure img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .cert-figure figcaption {
  margin-top: 10px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

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

@media (min-width: 760px) {
  .page-about .cert-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }
}

/* 团队 */
.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ink-700);
  border: var(--about-line);
}

.page-about .team-card {
  background: var(--ink-800);
  padding: 18px 16px;
  display: grid;
  gap: 6px;
  align-content: start;
  transition: background 0.2s var(--ease);
}

.page-about .team-card:hover {
  background: var(--ink-950);
}

.page-about .team-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  line-height: 1;
  color: var(--signal);
}

.page-about .team-name {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .team-desc {
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
  max-width: none;
}

.page-about .team-figure {
  margin: 0;
  border: var(--about-line);
  background: var(--ink-800);
}

.page-about .team-figure img {
  width: 100%;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .cadence {
  display: grid;
  gap: 12px;
  border-left: 2px solid var(--cyan);
  padding: 4px 0 4px 16px;
}

.page-about .cadence p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 560px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 覆盖范围 */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .reach-copy {
  display: grid;
  gap: 14px;
}

.page-about .reach-map {
  position: relative;
  border: var(--about-line);
  background-color: var(--ink-800);
  background-image:
    radial-gradient(rgba(59, 216, 232, 0.32) 1px, transparent 1px),
    linear-gradient(180deg, rgba(7, 17, 31, 0) 45%, rgba(7, 17, 31, 0.85) 100%);
  background-size: 16px 16px, 100% 100%;
  aspect-ratio: 4 / 3;
  min-height: 180px;
}

.page-about .reach-map-tag {
  position: absolute;
  right: 14px;
  bottom: 14px;
  padding: 4px 9px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper);
  background: rgba(7, 17, 31, 0.86);
  border: 1px solid var(--ink-700);
}

@media (min-width: 800px) {
  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

/* 质量体系 */
.page-about .check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: about-chk;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ink-700);
  border: var(--about-line);
}

.page-about .check-item {
  background: var(--ink-800);
  padding: 12px 16px;
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .check-item::before {
  counter-increment: about-chk;
  content: counter(about-chk, decimal-leading-zero);
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .honor-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .honor {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 18px 16px;
  border: 1px solid rgba(214, 168, 75, 0.45);
  background:
    linear-gradient(180deg, rgba(214, 168, 75, 0.1), transparent 72%),
    var(--ink-800);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .honor:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
}

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

.page-about .honor-year {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .honor-title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.5;
}

.page-about .honor p {
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
}

@media (min-width: 560px) {
  .page-about .honor-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .check-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 结尾动作区 */
.page-about .about-cta {
  display: grid;
  gap: 16px;
  border-top: 2px solid var(--signal);
  padding-top: 20px;
}

.page-about .about-cta p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 右侧数据条 ---------- */
.page-about .about-data {
  min-width: 0;
  border-top: 2px solid var(--gold);
  padding-top: 14px;
}

.page-about .data-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .data-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(152px, 1fr));
  gap: 1px;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-about .data-item {
  display: grid;
  gap: 2px;
  align-content: start;
  padding: 12px 14px;
  background: var(--ink-800);
  transition: background 0.2s var(--ease);
}

.page-about .data-item:hover {
  background: var(--ink-950);
}

.page-about .data-num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--paper);
}

.page-about .data-num em {
  font-style: normal;
  font-size: 12px;
  color: var(--mist);
  margin-left: 3px;
}

.page-about .data-label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .data-note {
  font-size: 11.5px;
  line-height: 1.62;
  color: rgba(169, 190, 210, 0.72);
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 940px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--head-h) + 18px);
  }
  .page-about .about-data {
    grid-column: 1 / -1;
  }
  .page-about .data-list {
    grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
  }
}

@media (min-width: 1280px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr) var(--about-data);
  }
  .page-about .about-data {
    grid-column: 3;
    grid-row: 1;
    align-self: start;
    position: sticky;
    top: calc(var(--head-h) + 18px);
  }
  .page-about .data-list {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .stage,
  .page-about .team-card,
  .page-about .honor,
  .page-about .data-item {
    transition: none;
  }
  .page-about .stage:hover,
  .page-about .stage:focus-within,
  .page-about .honor:hover {
    transform: none;
  }
}
<<<END>>>