.page-about {
  background-color: var(--bg);
  color: var(--fg);
  padding-bottom: 64px;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

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

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  display: grid;
  gap: 30px;
  padding: 22px 0 44px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--fg);
}

.page-about .about-title__accent {
  display: block;
  color: var(--cyan);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--fg-dim);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 品牌概览卡 */
.page-about .about-facts {
  background: var(--mid);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--cyan);
  padding: 20px 20px 14px;
  box-shadow: 8px 8px 0 rgba(3, 10, 16, 0.55);
}

.page-about .about-facts__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--slate);
}

.page-about .fact-list {
  margin: 0;
  padding: 0;
}

.page-about .fact {
  display: grid;
  gap: 2px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .fact:last-child {
  border-bottom: none;
}

.page-about .fact dt {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--slate);
}

.page-about .fact dd {
  margin: 0;
  font-size: 14px;
  color: var(--fg);
}

.page-about .fact-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

/* ===== 章节通用 ===== */
.page-about .about-sec {
  padding: 44px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-sec--last {
  border-bottom: none;
  padding-bottom: 8px;
}

.page-about .sec-head {
  display: grid;
  gap: 8px;
  margin-bottom: 28px;
}

.page-about .sec-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 5vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.page-about .sec-note {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-dim);
}

/* ===== 01 服务范围 ===== */
.page-about .scope-layout {
  display: grid;
  gap: 18px;
}

.page-about .scope-annot {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--slate);
}

.page-about .scope-text {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--fg);
}

.page-about .scope-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .scope-item {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  background: var(--mid);
  border-left: 2px solid var(--steel);
}

.page-about .scope-item__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .scope-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg-dim);
}

/* ===== 02 年份轴 ===== */
.page-about .tl {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 26px 24px;
  border-left: 1px solid var(--line-soft);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(69, 224, 218, 0.16);
}

.page-about .tl-item--now::before {
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 138, 61, 0.2);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 32px;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--mist);
  opacity: 0.85;
}

.page-about .tl-year--text {
  font-size: 20px;
  color: var(--orange);
  opacity: 1;
}

.page-about .tl-body h3 {
  margin: 10px 0 6px;
  font-size: 17px;
  line-height: 1.5;
  color: var(--fg);
}

.page-about .tl-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* ===== 03 团队 ===== */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .team-card {
  background: var(--mid);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--cyan);
  padding: 18px 18px 20px;
}

.page-about .team-card:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .team-card:nth-child(3) {
  border-top-color: var(--slate);
}

.page-about .team-card h3 {
  margin: 12px 0 8px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* ===== 04 双端 ===== */
.page-about .duo {
  display: grid;
  gap: 16px;
}

.page-about .duo-card {
  background: linear-gradient(160deg, rgba(69, 224, 218, 0.08), transparent 62%), var(--mid);
  border: 1px solid var(--line-strong);
  padding: 20px;
}

.page-about .duo-card--alt {
  background: linear-gradient(160deg, rgba(255, 138, 61, 0.08), transparent 62%), var(--mid);
}

.page-about .duo-card__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .duo-card--alt .duo-card__label {
  color: var(--orange);
}

.page-about .duo-card h3 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.25;
  color: var(--fg);
}

.page-about .duo-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .duo-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fg-dim);
}

.page-about .duo-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.page-about .duo-card--alt .duo-list li::before {
  background: var(--orange);
}

.page-about .duo-foot {
  margin: 20px 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* ===== 05 合作流程 ===== */
.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 14px;
  align-items: start;
  padding: 16px 18px;
  background: var(--mid);
  border-left: 2px solid var(--cyan);
}

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

.page-about .step-num {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .step:last-child .step-num {
  color: var(--orange);
}

.page-about .step h3 {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg);
}

.page-about .step p {
  margin: 0;
  grid-column: 2;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* ===== 06 资质 ===== */
.page-about .seal {
  position: relative;
  border: 2px solid var(--steel);
  outline: 1px solid var(--line);
  outline-offset: 5px;
  padding: 22px 18px;
  background: rgba(11, 39, 64, 0.72);
}

.page-about .seal-row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .seal-row:last-of-type {
  border-bottom: none;
}

.page-about .seal-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .seal-value {
  font-size: 15px;
  line-height: 1.7;
  color: var(--fg);
  word-break: break-word;
}

.page-about .seal .copy-field {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about .seal .copy-value {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .seal .copy-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 3px 9px;
  color: var(--cyan);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .seal .copy-btn:hover,
.page-about .seal .copy-btn:focus-visible {
  background: var(--cyan);
  color: var(--deep);
}

.page-about .seal-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* ===== 07 延伸 ===== */
.page-about .next-grid {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: var(--mid);
  border: 1px solid var(--line-strong);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: 0 6px 0 rgba(3, 10, 16, 0.45);
}

.page-about .next-card__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .next-card__title {
  font-size: 15px;
  line-height: 1.65;
  color: var(--fg);
}

/* ===== 图片容器 ===== */
.page-about .img-frame {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--ink);
  padding: 6px;
}

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

.page-about .img-cap {
  padding: 8px 6px 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

/* ===== 入场 ===== */
.page-about [data-reveal] {
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .next-card,
  .page-about .seal .copy-btn {
    transition: none;
  }

  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}

/* ===== 平板及以上 ===== */
@media (min-width: 720px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 40px;
    align-items: start;
    padding-top: 30px;
  }

  .page-about .about-facts {
    margin-top: 56px;
  }

  .page-about .about-sec {
    padding: 56px 0;
  }

  .page-about .scope-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

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

  .page-about .seal {
    padding: 26px 26px;
  }

  .page-about .seal-row {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

/* ===== 桌面及以上 ===== */
@media (min-width: 960px) {
  .page-about .scope-layout {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 30px;
  }

  .page-about .scope-annot {
    writing-mode: vertical-rl;
    padding-top: 6px;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 0 28px;
    padding-left: 28px;
    padding-bottom: 30px;
  }

  .page-about .tl-year {
    font-size: 38px;
  }

  .page-about .tl-year--text {
    font-size: 22px;
    padding-top: 8px;
  }

  .page-about .tl-body h3 {
    margin-top: 4px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 56px;
  }

  .page-about .about-facts {
    margin-top: 72px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.75fr);
    gap: 56px;
  }

  .page-about .about-lede {
    font-size: 17px;
  }
}
<<<END>>>