.page-about {
  --about-rail: 190px;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mist);
}
.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .breadcrumb a:hover {
  color: var(--cyan);
}
.page-about .crumb-sep {
  color: var(--line);
}
.page-about .crumb-now {
  color: var(--amber-soft);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 5vw, 60px) 0 clamp(40px, 6vw, 84px);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: .3;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 76%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -18%;
  width: min(620px, 70vw);
  height: min(440px, 52vw);
  background: linear-gradient(140deg, rgba(53, 242, 224, .2), rgba(15, 185, 201, .04));
  clip-path: polygon(24% 0, 100% 0, 100% 72%, 0 100%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 54px);
}
.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 7.6vw, 92px);
  line-height: 1.03;
  letter-spacing: .005em;
  color: var(--white);
}
.page-about .about-hero__title strong {
  font-weight: 700;
  color: var(--cyan);
}
.page-about .about-hero__lede {
  margin-top: 22px;
  max-width: 48ch;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .about-hero__facts {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 30px);
}
.page-about .fact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin: 0;
}
.page-about .fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
}
.page-about .fact dd {
  margin: 7px 0 0;
  font-size: 17px;
  color: var(--white);
  line-height: 1.4;
}
.page-about .fact__domain {
  font-family: var(--font-mono);
  font-size: 15px;
  word-break: break-all;
  color: var(--cyan);
}
.page-about .about-hero__note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* 历程：年份刻度 + 档案卡 */
.page-about .about-track {
  border-top: 1px solid var(--line);
}
.page-about .track-layout {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}
.page-about .scale-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}
.page-about .scale {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-about .scale li {
  position: relative;
  flex: 0 0 auto;
}
.page-about .scale__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .scale__link:hover {
  border-color: rgba(53, 242, 224, .6);
  background: rgba(53, 242, 224, .06);
}
.page-about .scale__name {
  font-size: 13px;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}
.page-about .scale__link:hover .scale__name {
  color: var(--white);
}

.page-about .track-main__lede {
  margin-top: 16px;
  max-width: 56ch;
}
.page-about .dossier {
  position: relative;
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(24px, 3.4vw, 36px);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  scroll-margin-top: calc(var(--header-h) + 28px);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .dossier::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 78px;
  height: 78px;
  background: linear-gradient(135deg, rgba(255, 179, 60, .8), rgba(255, 179, 60, 0) 78%);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  border-top-left-radius: var(--radius);
  opacity: .45;
  pointer-events: none;
}
.page-about .dossier:hover {
  border-color: rgba(53, 242, 224, .5);
  box-shadow: 0 0 24px rgba(53, 242, 224, .12), 0 16px 42px rgba(0, 0, 0, .45);
  transform: translateY(-4px);
}
.page-about .dossier__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .22em;
  color: var(--amber);
}
.page-about .dossier__title {
  margin: 12px 0 12px;
  font-size: clamp(20px, 2.8vw, 27px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--white);
}
.page-about .dossier p {
  margin: 0;
  color: var(--mist);
  line-height: 1.75;
}

.page-about .about-figure {
  margin: clamp(24px, 3.6vw, 38px) 0 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

/* 栏目地图 */
.page-about .about-channels__lede {
  margin-top: 16px;
  max-width: 56ch;
}
.page-about .channel-map {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: clamp(14px, 2.6vw, 26px);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-about .channel-map svg {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}
.page-about .cm-lines path {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}
.page-about .cm-node rect {
  fill: var(--ink-900);
  stroke: var(--line);
  transition: stroke var(--dur) var(--ease), fill var(--dur) var(--ease);
}
.page-about .cm-node text {
  fill: var(--white);
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: .04em;
}
.page-about .cm-node:hover rect {
  stroke: var(--cyan);
  fill: rgba(53, 242, 224, .08);
}
.page-about .cm-node:hover text {
  fill: var(--cyan);
}

.page-about .channel-layout {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(28px, 4vw, 46px);
}
.page-about .channel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .channel-row {
  border-bottom: 1px solid var(--line);
}
.page-about .channel-row > a,
.page-about .channel-row__inner {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 26px;
  gap: 14px;
  align-items: start;
  padding: 22px 6px;
  text-decoration: none;
  color: inherit;
  transition: background var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.page-about .channel-row > a:hover {
  background: rgba(53, 242, 224, .06);
  padding-left: 16px;
}
.page-about .channel-row__no {
  font-family: var(--font-mono);
  font-size: 13px;
  padding-top: 5px;
  color: var(--amber);
}
.page-about .channel-row__name {
  display: block;
  font-size: 19px;
  font-weight: 600;
  color: var(--white);
}
.page-about .channel-row__desc {
  display: block;
  margin-top: 7px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .channel-row__go {
  font-size: 16px;
  padding-top: 5px;
  color: var(--cyan);
  transition: transform var(--dur) var(--ease);
}
.page-about .channel-row > a:hover .channel-row__go {
  transform: translateX(4px);
}
.page-about .channel-row__badge {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  padding-top: 7px;
  color: var(--cyan-deep);
}
.page-about .channel-row--now .channel-row__name {
  color: var(--cyan);
}

.page-about .channel-side img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.page-about .channel-side p {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
}

/* 分类标签 */
.page-about .about-tags__lede {
  margin-top: 16px;
  max-width: 56ch;
}
.page-about .tag-board {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 42px);
}
.page-about .tag-item {
  padding: 22px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .tag-item:hover,
.page-about .tag-item:focus-within {
  border-color: rgba(53, 242, 224, .5);
  box-shadow: 0 0 22px rgba(53, 242, 224, .12);
}
.page-about .tag-item .tag--on {
  background: var(--cyan-deep);
  border-color: var(--cyan-deep);
  color: var(--ink-900);
}
.page-about .tag-item__lead {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--white);
}
.page-about .tag-item__more {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows var(--dur) var(--ease);
}
.page-about .tag-item__more > div {
  overflow: hidden;
}
.page-about .tag-item__more p {
  margin: 0;
  padding-top: 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* 归档节奏 */
.page-about .about-archive {
  border-top: 1px solid var(--line);
}
.page-about .about-archive__lede {
  margin-top: 16px;
  max-width: 56ch;
}
.page-about .archive-list {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .archive-card {
  padding: 22px 24px;
  scroll-margin-top: calc(var(--header-h) + 28px);
}
.page-about .archive-card__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mist);
}
.page-about .archive-card__meta .num {
  margin-right: 10px;
}
.page-about .archive-card h3 {
  margin: 12px 0 10px;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--white);
}
.page-about .archive-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* 服务半径 */
.page-about .reach-layout {
  display: grid;
  gap: clamp(28px, 4vw, 54px);
}
.page-about .reach-copy__lede {
  margin-top: 16px;
  max-width: 52ch;
}
.page-about .reach-points {
  list-style: none;
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 15px;
}
.page-about .reach-points li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .reach-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
}
.page-about .reach-points strong {
  font-weight: 600;
  color: var(--white);
}
.page-about .reach-media {
  position: relative;
}
.page-about .reach-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.page-about .reach-media::after {
  content: "";
  position: absolute;
  right: -4%;
  bottom: -5%;
  width: 120px;
  height: 120px;
  background: linear-gradient(135deg, rgba(255, 179, 60, .34), rgba(255, 179, 60, 0));
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

/* 长期坚持 */
.page-about .creed-grid {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
  margin-top: clamp(26px, 4vw, 44px);
}
.page-about .creed {
  padding: 26px 24px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .creed:hover {
  border-color: rgba(255, 179, 60, .5);
  transform: translateY(-4px);
}
.page-about .creed__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  letter-spacing: .1em;
}
.page-about .creed h3 {
  margin: 14px 0 10px;
  font-size: 20px;
  font-weight: 600;
  color: var(--white);
}
.page-about .creed p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* 收尾 */
.page-about .about-next {
  padding-bottom: clamp(48px, 7vw, 96px);
}
.page-about .next-box {
  position: relative;
  padding: clamp(26px, 4vw, 46px);
  background: linear-gradient(120deg, rgba(53, 242, 224, .14), rgba(255, 179, 60, .07) 60%, rgba(7, 9, 13, 0) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  gap: 20px;
  justify-items: start;
}
.page-about .next-box h2 {
  margin: 0;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 400;
  line-height: 1.25;
  color: var(--white);
}
.page-about .next-box p {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 入场 */
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    animation: aboutReveal 300ms var(--ease) both;
  }
}
@keyframes aboutReveal {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-about .tag-board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .archive-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }
  .page-about .about-hero__facts {
    align-self: end;
  }

  .page-about .track-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }
  .page-about .scale-box {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }
  .page-about .scale {
    flex-direction: column;
    gap: 28px;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .scale li {
    padding-left: 22px;
  }
  .page-about .scale li::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 8px;
    bottom: -28px;
    width: 1px;
    background: var(--line);
  }
  .page-about .scale li:last-child::before {
    bottom: 8px;
  }
  .page-about .scale li::after {
    content: "";
    position: absolute;
    left: 2px;
    top: 7px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--amber);
    box-shadow: 0 0 10px rgba(255, 179, 60, .55);
  }
  .page-about .scale__link {
    border: 0;
    padding: 0;
    border-radius: 0;
    background: none;
  }
  .page-about .scale__link:hover {
    background: none;
  }

  .page-about .creed-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .creed:nth-child(2) {
    transform: translateY(24px);
  }
  .page-about .creed:nth-child(2):hover {
    transform: translateY(20px);
  }
}

@media (min-width: 1000px) {
  .page-about .channel-layout {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }
  .page-about .reach-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .tag-board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 1000px) {
  .page-about .tag-item__more {
    grid-template-rows: 0fr;
  }
  .page-about .tag-item:hover .tag-item__more,
  .page-about .tag-item:focus-within .tag-item__more {
    grid-template-rows: 1fr;
  }
}