.page-about {
  background: var(--night);
  color: var(--body-text);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: hidden;
}

.page-about .about-hero-wrap {
  padding-top: clamp(16px, 3vw, 32px);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

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

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

/* 封面 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(57, 230, 224, 0.2);
  background: var(--night-2);
  isolation: isolate;
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(5, 16, 31, 0.3) 0%, rgba(5, 16, 31, 0.88) 70%, rgba(5, 16, 31, 0.97) 100%),
    radial-gradient(120% 90% at 12% 0%, rgba(57, 230, 224, 0.18), transparent 60%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
  padding: clamp(28px, 5vw, 64px);
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 0 0 18px;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.4vw, 4.1rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .about-hero-lead {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 46ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--body-text);
}

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

.page-about .about-key {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border: 1px solid rgba(169, 184, 201, 0.24);
  border-radius: var(--radius-md);
  background: rgba(7, 20, 38, 0.66);
  color: var(--chalk);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-key:hover,
.page-about .about-key:focus-visible {
  border-color: rgba(255, 107, 44, 0.7);
  background: rgba(255, 107, 44, 0.12);
  transform: translateY(-2px);
}

.page-about .about-key-num {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-key-text {
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .about-key-sub {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* 目录 + 主体 */
.page-about .about-layout {
  display: grid;
  gap: clamp(20px, 3vw, 44px);
  margin-top: clamp(28px, 5vw, 56px);
}

.page-about .about-index {
  border-top: 1px solid rgba(169, 184, 201, 0.24);
  padding-top: 14px;
}

.page-about .about-index-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid rgba(169, 184, 201, 0.22);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--body-text);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-index-link .num {
  font-size: 11px;
  color: var(--cyan);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--chalk);
  border-color: rgba(255, 107, 44, 0.65);
  background: rgba(255, 107, 44, 0.12);
}

/* 章节 */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 20px);
  padding-top: clamp(22px, 3.4vw, 34px);
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .about-chapter::before {
  content: "";
  display: block;
  height: 2px;
  margin-bottom: clamp(18px, 3vw, 30px);
  background-image: repeating-linear-gradient(90deg, rgba(47, 191, 113, 0.55) 0 10px, transparent 10px 22px);
}

.page-about .about-chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  align-items: baseline;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-chapter-index {
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
  color: rgba(169, 184, 201, 0.45);
}

.page-about .about-chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .about-chapter-lead {
  grid-column: 1 / -1;
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* 筛选 */
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(16px, 2.4vw, 22px);
}

.page-about .about-filter .chip {
  padding: 8px 16px;
  border: 1px solid rgba(169, 184, 201, 0.26);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--body-text);
  font-family: var(--font-body);
  font-size: 13px;
  cursor: pointer;
  transition: color 0.14s var(--ease), border-color 0.14s var(--ease), background 0.14s var(--ease);
}

.page-about .about-filter .chip:hover {
  color: var(--chalk);
  border-color: rgba(57, 230, 224, 0.6);
}

.page-about .about-filter .chip[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  font-weight: 600;
}

.page-about [data-filter-item][hidden],
.page-about [data-filter-item].is-hidden {
  display: none !important;
}

/* 时间线 */
.page-about .about-timeline {
  display: grid;
  gap: 12px;
}

.page-about .tl-item {
  border: 1px solid rgba(169, 184, 201, 0.2);
  border-radius: var(--radius-md);
  background: linear-gradient(155deg, rgba(11, 30, 51, 0.92), rgba(7, 20, 38, 0.72));
  overflow: hidden;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .tl-item[open] {
  border-color: rgba(57, 230, 224, 0.45);
  background: rgba(11, 30, 51, 0.98);
}

.page-about .tl-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .tl-num {
  align-self: start;
  padding: 3px 10px;
  border: 1px solid rgba(57, 230, 224, 0.45);
  border-radius: var(--radius-pill);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .tl-phase {
  display: block;
  margin-bottom: 3px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-size: clamp(15px, 2.2vw, 17.5px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--chalk);
}

.page-about .tl-toggle {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--orange);
  transition: transform 0.2s var(--ease);
}

.page-about .tl-item[open] .tl-toggle {
  transform: rotate(45deg);
}

.page-about .tl-detail {
  padding: 14px 18px 20px;
  border-top: 1px dashed rgba(169, 184, 201, 0.22);
}

.page-about .tl-detail p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .tl-meta {
  margin-top: 14px;
}

.page-about .tl-meta .tag {
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(169, 184, 201, 0.3);
  font-size: 12px;
  color: var(--mist);
}

.page-about .tl-meta .tag--green {
  border-color: rgba(47, 191, 113, 0.55);
  color: var(--green);
}

.page-about .tl-meta .tag--orange {
  border-color: rgba(255, 107, 44, 0.6);
  color: var(--orange);
}

.page-about .tl-meta .tag--cyan {
  border-color: rgba(57, 230, 224, 0.55);
  color: var(--cyan);
}

/* 纸色面板 */
.page-about .paper-panel {
  border-radius: var(--radius-lg);
  background: var(--paper);
  color: var(--ink-text);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.3);
  padding: clamp(20px, 3vw, 32px);
}

/* 归档 */
.page-about .about-archive {
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
}

.page-about .drawer-title {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink-text);
}

.page-about .tag-drawer {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tag-drawer li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(5, 16, 31, 0.12);
}

.page-about .tag-drawer li:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .drawer-num {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #b8451a;
}

.page-about .drawer-name {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-text);
}

.page-about .drawer-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: #3b4a58;
}

.page-about .about-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid rgba(169, 184, 201, 0.2);
}

.page-about .about-figure figcaption {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-rhythm {
  display: grid;
  gap: 12px;
  margin-top: clamp(16px, 2.6vw, 24px);
}

.page-about .rhythm-card {
  padding: 16px 18px;
  border: 1px solid rgba(169, 184, 201, 0.18);
  border-radius: var(--radius-md);
  background: rgba(11, 30, 51, 0.78);
}

.page-about .rhythm-label {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .rhythm-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .rhythm-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .team-group {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(169, 184, 201, 0.16);
}

.page-about .team-group-num {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .team-group-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .team-group-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .about-fix {
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .fix-title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink-text);
}

.page-about .fix-text {
  margin: 0 0 10px;
  font-size: 13.5px;
  line-height: 1.8;
  color: #3b4a58;
}

.page-about .fix-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
}

.page-about .about-copy {
  padding: 10px 18px;
  border: none;
  border-radius: var(--radius-pill);
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-copy:hover {
  transform: translateY(-1px);
}

.page-about .about-copy[data-copied] {
  background: var(--green);
}

.page-about .fix-mail {
  font-size: 13px;
  color: var(--ink-text);
}

/* 规模 */
.page-about .about-stats {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .about-stat {
  padding: 16px 18px;
  border: 1px solid rgba(169, 184, 201, 0.18);
  border-radius: var(--radius-md);
  background: rgba(11, 30, 51, 0.8);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stat-unit {
  margin-left: 3px;
  font-size: 0.62em;
  color: var(--mist);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  color: var(--mist);
}

.page-about .about-chart {
  margin-top: clamp(16px, 2.6vw, 24px);
  padding: 16px;
  border: 1px solid rgba(169, 184, 201, 0.16);
  border-radius: var(--radius-md);
  background: rgba(11, 30, 51, 0.62);
}

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

.page-about .about-chart-note {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* 资质 */
.page-about .about-creds {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.page-about .about-cred {
  padding: 16px 18px;
  border-left: 3px solid var(--green);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(11, 30, 51, 0.72);
}

.page-about .cred-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--chalk);
}

.page-about .cred-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* 后续入口 */
.page-about .about-next {
  display: grid;
  gap: 10px;
}

.page-about .about-link {
  position: relative;
  display: block;
  padding: 16px 46px 16px 20px;
  border: 1px solid rgba(169, 184, 201, 0.22);
  border-radius: var(--radius-pill);
  color: var(--chalk);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-link::after {
  content: "→";
  position: absolute;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--orange);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-color: rgba(255, 107, 44, 0.7);
  background: rgba(255, 107, 44, 0.1);
  transform: translateX(3px);
}

.page-about .about-link-text {
  display: block;
  font-size: 15px;
  font-weight: 600;
}

.page-about .about-link-text small {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .about-keys {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-archive {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-figure--tall {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    border-top: none;
    border-left: 1px solid rgba(169, 184, 201, 0.24);
    padding: 0 0 0 18px;
  }

  .page-about .about-index-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index-link {
    border: none;
    border-radius: 0;
    background: none;
    padding: 7px 0;
  }

  .page-about .about-index-link:hover,
  .page-about .about-index-link:focus-visible {
    background: none;
    color: var(--chalk);
  }

  .page-about .tl-summary {
    padding: 18px 22px;
  }

  .page-about .tl-detail {
    padding: 16px 22px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-key,
  .page-about .about-link,
  .page-about .tl-toggle,
  .page-about .about-copy {
    transition: none;
  }

  .page-about .about-key:hover,
  .page-about .about-link:hover {
    transform: none;
  }
}
<<<END>>>