.page-about {
  --about-panel: var(--ink-2);
  --about-panel-2: var(--ink-3);
  --about-gap: clamp(18px, 3vw, 30px);
  color: var(--fg);
}

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

.page-about a {
  color: inherit;
}

/* 顶部面包屑 */
.page-about .about-top {
  padding-top: clamp(20px, 3vw, 34px);
}

.page-about .breadcrumbs {
  display: flex;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--fg-mute);
}

.page-about .crumbs-item + .crumbs-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-bright);
}

.page-about .crumbs-item a {
  text-decoration: none;
  color: var(--fg-dim);
  transition: color var(--dur) var(--ease);
}

.page-about .crumbs-item a:hover,
.page-about .crumbs-item a:focus-visible {
  color: var(--cyan);
}

.page-about .crumbs-item[aria-current="page"] {
  color: var(--fg);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(26px, 4vw, 54px) 0 clamp(34px, 5vw, 64px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero-copy .eyebrow {
  margin: 0 0 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero-copy .eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.page-about .about-lede {
  margin: 0;
  max-width: 34em;
  color: var(--fg-dim);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 26px 0 24px;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-fact {
  flex: 1 1 33%;
  min-width: 92px;
  padding: 14px 16px 12px 0;
  border-right: 1px solid var(--line-soft);
}

.page-about .about-fact:last-child {
  border-right: 0;
}

.page-about .about-fact dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--fg-mute);
  margin-bottom: 6px;
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
  font-family: var(--font-mono);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  font-size: 14px;
  border-radius: 2px;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-hero-actions .btn--primary {
  background: var(--cyan);
  color: var(--ink-0);
  font-weight: 700;
}

.page-about .about-hero-actions .btn--primary:hover,
.page-about .about-hero-actions .btn--primary:focus-visible {
  transform: translateY(-1px);
  background: #2ff5e2;
}

.page-about .about-hero-actions .btn--ghost {
  border-color: var(--line-bright);
  color: var(--fg);
}

.page-about .about-hero-actions .btn--ghost:hover,
.page-about .about-hero-actions .btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-hero-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  transform: rotate(-1.4deg);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
}

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 22px -18px -18px 22px;
  border: 1px solid var(--line-soft);
  background: linear-gradient(135deg, rgba(18, 230, 210, 0.08), transparent 62%);
  z-index: 0;
}

.page-about .about-hero-media img {
  position: relative;
  z-index: 1;
  width: 100%;
  object-fit: cover;
}

.page-about .about-media-cap {
  position: relative;
  z-index: 1;
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--ink-1);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--fg-mute);
  text-transform: uppercase;
}

/* 主体骨架与左侧轨道 */
.page-about .about-shell {
  display: grid;
  gap: 0;
  padding-bottom: clamp(50px, 7vw, 96px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-main {
  min-width: 0;
}

.page-about .about-block {
  padding: clamp(30px, 4.6vw, 56px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-block:first-child {
  border-top: 0;
  padding-top: 0;
}

/* 章节头 */
.page-about .about-block-head {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  margin-bottom: var(--about-gap);
}

.page-about .about-rot {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-size: 9px;
  letter-spacing: 0.26em;
  color: var(--fg-mute);
  text-transform: uppercase;
  padding-top: 4px;
  white-space: nowrap;
}

.page-about .about-block-head h2 {
  margin: 0 0 8px;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-sub {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-mute);
}

/* 三条主线 */
.page-about .about-lines {
  display: grid;
  gap: 14px;
}

.page-about .about-line {
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--cyan);
  background: var(--about-panel);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-line:hover {
  border-color: var(--line-bright);
  border-left-color: var(--amber);
  transform: translateY(-2px);
}

.page-about .about-line-tag {
  margin: 0 0 10px;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-line h3 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
}

.page-about .about-line p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--fg-dim);
}

.page-about .about-line-link {
  margin: 0;
}

.page-about .about-line-link a {
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(18, 230, 210, 0.34);
  padding-bottom: 2px;
}

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

/* 竖向时间轴 */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--amber) 0%,
    var(--line-bright) 12%,
    var(--line) 88%,
    transparent 100%
  );
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 12px 26px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 18px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 158, 44, 0.14);
}

.page-about .about-tl-item--now::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(18, 230, 210, 0.16);
}

.page-about .about-tl-card {
  border: 1px solid var(--line-soft);
  background: var(--about-panel);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-tl-card:hover {
  border-color: var(--line-bright);
}

.page-about .about-tl-card summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl-round {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-tl-title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-tl-year {
  grid-column: 2;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--fg-mute);
}

.page-about .about-tl-card[open] summary {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-tl-card[open] .about-tl-year {
  color: var(--amber);
}

.page-about .about-tl-card p {
  margin: 0;
  padding: 14px 16px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* 团队三卡 */
.page-about .about-team {
  display: grid;
  gap: 14px;
}

.page-about .about-team-card {
  position: relative;
  padding: 22px 18px 20px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--about-panel-2), var(--about-panel) 46%);
  overflow: hidden;
}

.page-about .about-team-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 2px;
}

.page-about .about-team-card--a .about-team-bar {
  width: 100%;
  background: var(--cyan);
}

.page-about .about-team-card--b .about-team-bar {
  width: 68%;
  background: var(--violet);
}

.page-about .about-team-card--c .about-team-bar {
  width: 42%;
  background: var(--amber);
}

.page-about .about-team-num {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fg-mute);
}

.page-about .about-team-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-team-card > p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--fg-dim);
}

.page-about .about-team-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team-list li {
  position: relative;
  padding: 8px 0 8px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg-dim);
  border-bottom: 1px dashed rgba(36, 48, 73, 0.7);
}

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

.page-about .about-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 6px;
  height: 1px;
  background: var(--line-bright);
}

.page-about .about-team-media {
  margin: 18px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-team-media img {
  width: 100%;
  object-fit: cover;
}

/* 内容归档 */
.page-about .about-archive {
  display: grid;
  gap: 22px;
}

.page-about .about-archive-list {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-archive-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 8px;
  padding: 16px 14px;
  background: var(--about-panel);
}

.page-about .about-archive-idx {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--violet);
  padding-top: 3px;
}

.page-about .about-archive-item h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-archive-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--fg-dim);
}

.page-about .about-archive-media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-archive-media img {
  width: 100%;
  object-fit: cover;
}

/* 用户构成 */
.page-about .about-mix {
  margin-bottom: 22px;
}

.page-about .about-mix-bar {
  display: flex;
  gap: 3px;
  height: 14px;
  margin-bottom: 14px;
}

.page-about .about-mix-seg {
  position: relative;
  display: block;
  height: 100%;
  transition: filter var(--dur) var(--ease);
}

.page-about .about-mix-seg--a {
  flex: 5 1 0;
  background: linear-gradient(90deg, #0fbfae, var(--cyan));
}

.page-about .about-mix-seg--b {
  flex: 3 1 0;
  background: linear-gradient(90deg, #4d4380, var(--violet));
}

.page-about .about-mix-seg--c {
  flex: 2 1 0;
  background: linear-gradient(90deg, #c97815, var(--amber));
}

.page-about .about-mix-seg:hover,
.page-about .about-mix-seg:focus-within {
  filter: brightness(1.18);
}

.page-about .about-mix-pop {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%) translateY(4px);
  padding: 6px 10px;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--fg);
  background: var(--ink-0);
  border: 1px solid var(--line-bright);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  z-index: 3;
}

.page-about .about-mix-seg:hover .about-mix-pop {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.page-about .about-mix-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  color: var(--fg-dim);
}

.page-about .about-mix-legend li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .about-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.page-about .about-dot--a {
  background: var(--cyan);
}

.page-about .about-dot--b {
  background: var(--violet);
}

.page-about .about-dot--c {
  background: var(--amber);
}

.page-about .about-audience {
  display: grid;
  gap: 12px;
}

.page-about .about-aud-card {
  padding: 16px 16px 18px;
  border: 1px solid var(--line-soft);
  background: var(--about-panel);
  border-top: 1px solid var(--line-bright);
}

.page-about .about-aud-card h3 {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.5;
  font-weight: 700;
}

.page-about .about-aud-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* 更新节奏 */
.page-about .about-rhythm {
  display: grid;
  gap: 20px;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line);
  background: radial-gradient(
      120% 140% at 100% 0%,
      rgba(255, 158, 44, 0.09),
      transparent 58%
    ),
    var(--about-panel);
}

.page-about .about-rhythm-kicker {
  margin: 0 0 12px;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .about-rhythm-main p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--fg-dim);
}

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

.page-about .about-rhythm-stats {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-rhythm-stats li {
  padding: 14px 14px;
  background: var(--ink-1);
}

.page-about .about-stat-num {
  display: block;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .about-stat-unit {
  font-size: 12px;
  margin-left: 3px;
  color: var(--fg-dim);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--fg-mute);
}

/* 下一步入口 */
.page-about .about-next-grid {
  display: grid;
  gap: 10px;
}

.page-about .about-next-card {
  display: grid;
  gap: 6px;
  padding: 16px 16px 18px;
  text-decoration: none;
  border: 1px solid var(--line-soft);
  background: var(--about-panel);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
  background: var(--ink-3);
}

.page-about .about-next-idx {
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-next-card strong {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .about-next-card span:last-child {
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-dim);
}

/* 平板 */
@media (min-width: 680px) {
  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-line:first-child {
    grid-column: 1 / -1;
  }

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

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

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

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

  .page-about .about-rhythm-stats li {
    padding: 16px;
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    display: flex;
    flex-direction: column;
    gap: 2px;
    position: sticky;
    top: 92px;
    padding-right: 8px;
    border-right: 1px solid var(--line-soft);
  }

  .page-about .about-rail-title {
    margin: 0 0 10px;
    font-size: 10px;
    letter-spacing: 0.24em;
    color: var(--fg-mute);
  }

  .page-about .about-rail-link {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 9px 10px 9px 12px;
    font-size: 13px;
    line-height: 1.4;
    text-decoration: none;
    color: var(--fg-dim);
    border-left: 2px solid transparent;
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
      background var(--dur) var(--ease);
  }

  .page-about .about-rail-link .mono {
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--fg-mute);
    transition: color var(--dur) var(--ease);
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    color: var(--fg);
    border-left-color: var(--line-bright);
  }

  .page-about .about-rail-link[aria-current="true"] {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: rgba(18, 230, 210, 0.07);
  }

  .page-about .about-rail-link[aria-current="true"] .mono {
    color: var(--cyan);
  }

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

  .page-about .about-line:first-child {
    grid-column: auto;
  }

  .page-about .about-line {
    padding: 24px 20px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 16px;
  }

  .page-about .about-team-card--a {
    min-height: 320px;
  }

  .page-about .about-team-card--b {
    min-height: 280px;
    margin-top: 26px;
  }

  .page-about .about-team-card--c {
    min-height: 240px;
    margin-top: 52px;
  }

  .page-about .about-team-media {
    margin-top: 44px;
  }

  .page-about .about-archive {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-archive-media {
    margin-top: 24px;
  }

  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: 28px;
    align-items: start;
  }

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

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

/* 宽屏微调 */
@media (min-width: 1280px) {
  .page-about .about-hero-media {
    transform: rotate(-2deg);
  }

  .page-about .about-block {
    padding: clamp(40px, 4vw, 64px) 0;
  }
}

/* 减少动态 */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }

  .page-about .about-hero-media {
    transform: none;
  }
}