.page-about {
  --about-text-soft: rgba(245, 248, 255, 0.74);
  --about-ink-soft: rgba(18, 41, 74, 0.76);
  display: block;
  padding-top: 32px;
  color: var(--c-white);
}

.page-about .crumb-sep {
  margin: 0 0.5em;
  color: var(--c-steel);
}

.page-about h2 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.015em;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.22;
  margin: 12px 0 18px;
}

.page-about h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.4;
  margin: 0 0 10px;
}

.page-about p {
  line-height: 1.78;
}

.page-about .about-section {
  padding: clamp(54px, 8vw, 96px) 0;
}

/* ---------- 首屏 ---------- */
.about-hero {
  position: relative;
  padding-bottom: clamp(20px, 4vw, 40px);
}

.about-hero__grid {
  display: grid;
  gap: 30px;
  align-items: center;
}

.about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(29px, 6.6vw, 58px);
  line-height: 1.12;
  margin: 14px 0 18px;
}

.about-hero__lead {
  font-size: clamp(15px, 1.7vw, 17px);
  color: var(--about-text-soft);
  max-width: 34em;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.about-hero__media {
  position: relative;
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid var(--hairline-strong);
  box-shadow: var(--shadow-deep);
}

.about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(28px, 5vw, 44px);
  padding-top: 22px;
  border-top: 1px solid var(--hairline);
}

.about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(18, 41, 74, 0.9), rgba(9, 17, 32, 0.72));
}

.about-stat .stat-num {
  font-family: var(--font-data);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700;
  color: var(--c-cyan);
  letter-spacing: -0.01em;
}

.about-stat--hot .stat-num {
  color: var(--c-orange);
}

.page-about .about-stat .stat-key {
  font-size: 13px;
  color: var(--c-steel);
  letter-spacing: 0.02em;
}

/* ---------- 01 我们在做的事 ---------- */
.about-mission {
  padding-top: clamp(30px, 5vw, 52px);
}

.about-mission h2 {
  max-width: 22em;
}

.page-about .about-mission .prose p {
  color: var(--about-text-soft);
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

/* ---------- 02 内容体系 ---------- */
.about-system__intro {
  color: var(--about-text-soft);
  max-width: 40em;
  margin: 0 0 30px;
}

.about-system__grid {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
}

.about-pillar {
  padding: 22px 20px;
}

.page-about .about-pillar .index-num {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
  margin-bottom: 10px;
}

.about-pillar p {
  color: var(--about-text-soft);
  font-size: 15px;
  margin: 0 0 12px;
}

.page-about .about-pillar .about-pillar__note {
  font-size: 13px;
  color: var(--c-steel);
  border-left: 2px solid var(--c-orange);
  padding-left: 10px;
  margin: 0;
}

.about-system__media {
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid var(--hairline-strong);
}

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

.about-system__loop {
  margin: 26px 0 0;
  padding: 18px 20px;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  font-size: 15px;
  color: var(--about-text-soft);
}

/* ---------- 03 时间轴 ---------- */
.about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.tl-item {
  position: relative;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--hairline);
}

.tl-dot {
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(53, 230, 208, 0.14);
}

.tl-item:nth-child(3) .tl-dot {
  background: var(--c-violet);
  box-shadow: 0 0 0 4px rgba(162, 75, 255, 0.18);
}

.tl-year {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--c-orange);
  margin-bottom: 6px;
}

.tl-item h3 {
  margin-bottom: 8px;
}

.tl-item p {
  font-size: 14.5px;
  color: var(--about-text-soft);
  margin: 0;
}

.about-journey__media {
  margin: 34px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid var(--hairline-strong);
}

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

/* ---------- 04 编辑台（暖纸色宽章节） ---------- */
.page-about .about-desk {
  border-top: 2px solid var(--c-line);
  border-bottom: 2px solid var(--c-line);
  box-shadow: var(--shadow-lift);
}

.page-about .about-desk h2,
.page-about .about-desk h3 {
  color: var(--c-ink);
}

.page-about .about-desk .label {
  color: var(--c-ink);
  opacity: 0.62;
}

.about-desk__intro {
  color: var(--about-ink-soft);
  max-width: 40em;
  margin: 0;
}

.about-roles {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 32px;
}

.about-role {
  padding: 20px 18px;
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-md);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .about-role .index-num {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-ink);
  opacity: 0.5;
  margin-bottom: 10px;
}

.about-role p {
  font-size: 14.5px;
  color: var(--about-ink-soft);
  margin: 0;
}

.about-role:hover,
.about-role:focus-within {
  transform: translateY(-2px);
  border-color: var(--c-cyan);
  box-shadow: 0 16px 30px -22px rgba(11, 27, 51, 0.9);
}

.about-flow {
  margin-top: 30px;
  padding: 22px 20px;
  background: var(--c-ink);
  border: 2px solid var(--c-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lift);
}

.page-about .about-flow .about-flow__title {
  color: var(--c-white);
  font-size: clamp(16px, 2vw, 19px);
  margin-bottom: 16px;
}

.about-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.about-flow__list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-text-soft);
}

.page-about .about-flow .flow-idx {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--c-cyan);
  color: var(--c-cyan);
  font-family: var(--font-data);
  font-size: 12px;
  line-height: 20px;
  text-align: center;
}

/* ---------- 05 数据来源 ---------- */
.about-sources__grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.about-sources__copy p {
  color: var(--about-text-soft);
  margin: 0 0 16px;
}

.about-sources__panel {
  padding: 24px 20px;
  border: 2px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
}

.page-about .about-sources__panel h3 {
  color: var(--c-white);
  margin-bottom: 14px;
}

.about-sources__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.about-sources__list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14.5px;
  color: var(--about-text-soft);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--hairline);
}

.about-sources__list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-sources__list .stat-num {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-weight: 700;
  color: var(--c-orange);
}

/* ---------- 06 新疆浏览体验 ---------- */
.about-region__intro {
  color: var(--about-text-soft);
  max-width: 40em;
  margin: 0;
}

.about-region__body {
  display: grid;
  gap: 26px;
  margin-top: 30px;
}

.about-region__chart {
  margin: 0;
  padding: 22px 18px 14px;
  border: 2px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, rgba(18, 41, 74, 0.86), rgba(9, 17, 32, 0.74));
}

.latency-chart {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .lc-axis {
  stroke: var(--hairline-strong);
  stroke-width: 1;
}

.page-about .lc-tick {
  stroke: var(--hairline-strong);
  stroke-width: 1;
}

.page-about .lc-guide {
  stroke: var(--c-orange);
  stroke-width: 1;
  stroke-dasharray: 4 5;
  opacity: 0.7;
}

.page-about .lc-bar {
  fill: var(--c-cyan);
  opacity: 0.92;
}

.page-about .lc-label {
  fill: var(--c-steel);
  font-family: var(--font-data);
  font-size: 12px;
}

.page-about .lc-value {
  fill: var(--c-orange);
  font-family: var(--font-data);
  font-size: 16px;
  font-weight: 700;
}

.about-region__chart figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--c-steel);
  letter-spacing: 0.02em;
}

.about-region__notes {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.about-note {
  padding: 18px 18px 16px;
  border-left: 2px solid var(--c-cyan);
  background: rgba(18, 41, 74, 0.55);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.about-note h3 {
  margin-bottom: 8px;
}

.about-note p {
  font-size: 14.5px;
  color: var(--about-text-soft);
  margin: 0;
}

/* ---------- 收尾入口 ---------- */
.about-next {
  padding: clamp(44px, 7vw, 84px) 0 clamp(60px, 9vw, 110px);
}

.about-next__panel {
  padding: clamp(24px, 4vw, 40px);
  border: 2px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 120% at 90% 0%, rgba(162, 75, 255, 0.16), transparent 55%),
    linear-gradient(160deg, rgba(18, 41, 74, 0.92), rgba(9, 17, 32, 0.86));
  box-shadow: var(--shadow-deep);
}

.about-next__links {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
  margin: 8px 0 26px;
}

.about-next__link {
  display: grid;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  color: var(--c-white);
  text-decoration: none;
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .about-next__link .index-num {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.about-next__link strong {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
}

.about-next__link span:last-child {
  font-size: 14px;
  color: var(--c-steel);
}

.about-next__link:hover,
.about-next__link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--c-cyan);
}

.about-next__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .about-flow__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 24px;
  }
}

@media (min-width: 900px) {
  .page-about {
    padding-top: 48px;
  }

  .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 52px;
  }

  .about-system__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 18px;
  }

  .about-pillar {
    grid-column: span 2;
  }

  .about-system__media {
    grid-column: span 3;
    grid-row: span 2;
    margin: 0;
  }

  .about-pillar:nth-of-type(3) {
    grid-column: span 3;
  }

  .about-system__loop {
    margin-top: 34px;
    padding: 22px 26px;
  }

  .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    position: relative;
    padding-top: 34px;
    margin-top: 36px;
  }

  .about-timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 12px;
    height: 1px;
    background: var(--hairline-strong);
  }

  .tl-item {
    padding: 0 20px 0 0;
    border-left: none;
  }

  .tl-dot {
    left: 0;
    top: -27px;
  }

  .about-timeline::before {
    top: 12px;
  }

  .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .about-flow {
    padding: 28px 30px;
  }

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

  .about-sources__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
  }

  .about-region__body {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 32px;
    align-items: start;
  }

  .about-next__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1100px) {
  .about-timeline {
    gap: 0 4px;
  }

  .tl-item {
    padding-right: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-role:focus-within,
  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}