.page-about {
  --about-line: rgba(232, 236, 244, 0.14);
  --about-line-strong: rgba(232, 236, 244, 0.28);
  --about-cyan-soft: rgba(61, 240, 208, 0.10);
  position: relative;
  display: block;
  padding: 78px 0 56px;
  background: var(--night);
  color: var(--mist);
  overflow-x: clip;
}

@media (min-width: 901px) {
  .page-about {
    padding-top: 40px;
  }
}

.page-about .breadcrumbs {
  margin-bottom: 24px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 8px 0 44px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -130px;
  left: -12%;
  width: 124%;
  height: 470px;
  background:
    radial-gradient(52% 74% at 16% 30%, var(--red-soft), transparent 70%),
    radial-gradient(46% 62% at 84% 18%, rgba(61, 240, 208, 0.15), transparent 72%);
  pointer-events: none;
  z-index: -2;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: -60px -12% auto -12%;
  height: 480px;
  background-image:
    linear-gradient(var(--mist-08) 1px, transparent 1px),
    linear-gradient(90deg, var(--mist-08) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(60% 58% at 26% 26%, #000 0%, transparent 76%);
  mask-image: radial-gradient(60% 58% at 26% 26%, #000 0%, transparent 76%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__kicker {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.95rem, 7.6vw, 4.05rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--mist-72);
}

/* 首屏数据条 */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--mist-14);
  border: 1px solid var(--mist-14);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink);
  padding: 18px 14px 16px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-stat__unit {
  margin-left: 2px;
  font-size: 0.76rem;
  color: var(--paper-deep);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 7px;
  font-size: 0.74rem;
  line-height: 1.5;
  letter-spacing: 0.05em;
  color: var(--mist-52);
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-stat {
    padding: 22px 20px 20px;
  }
  .page-about .about-stat__num {
    font-size: 1.85rem;
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  margin-top: 44px;
  padding-top: 48px;
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 78px;
}

.page-about .about-chapter__head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.page-about .about-chapter__no {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 2.5rem;
  line-height: 0.88;
  color: transparent;
  -webkit-text-stroke: 1px var(--mist-34);
}

.page-about .about-chapter__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.3rem;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-chapter__title::before {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  margin-bottom: 12px;
  border-radius: 2px;
  background: var(--red);
}

.page-about .about-chapter__kicker {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--mist-34);
}

@media (min-width: 760px) {
  .page-about .about-chapter {
    margin-top: 56px;
    padding-top: 56px;
  }
  .page-about .about-chapter__no {
    font-size: 3.5rem;
  }
  .page-about .about-chapter__title {
    font-size: 1.6rem;
  }
}

/* ---------- 图文分栏 ---------- */

.page-about .about-split {
  display: grid;
  gap: 22px;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .about-split .about-figure {
    margin-top: 4px;
  }
}

.page-about .about-body p {
  margin: 0 0 16px;
  font-size: 0.92rem;
  line-height: 1.9;
  color: var(--mist-72);
}

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

.page-about .about-body strong {
  color: var(--mist);
  font-weight: 600;
}

.page-about .about-body--standalone {
  margin: 24px 0 0;
  max-width: 68ch;
  font-size: 0.92rem;
  line-height: 1.9;
  color: var(--mist-72);
}

.page-about .about-lead {
  margin: 0 0 20px;
  max-width: 68ch;
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--mist-72);
}

.page-about .about-body--standalone a,
.page-about .about-lead a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  background: var(--ink);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--about-line);
  background: var(--night);
  font-size: 0.74rem;
  line-height: 1.7;
  color: var(--mist-52);
}

.page-about .about-figure--wide {
  margin-top: 24px;
}

/* ---------- 角色卡片 ---------- */

.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(216px, 1fr));
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  position: relative;
  padding: 18px 16px 20px;
  border: 1px solid var(--about-line);
  border-radius: 16px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-role::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-3px);
  border-color: rgba(61, 240, 208, 0.42);
  background: rgba(61, 240, 208, 0.05);
}

.page-about .about-role:hover::after,
.page-about .about-role:focus-within::after {
  transform: scaleX(1);
}

.page-about .about-role__count {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-role__name {
  margin: 8px 0 8px;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.85;
  color: var(--mist-52);
}

/* ---------- 数据双通道 ---------- */

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

@media (min-width: 760px) {
  .page-about .about-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-channel {
  padding: 18px 16px 20px;
  border: 1px solid var(--about-line);
  border-radius: 16px;
  background: linear-gradient(150deg, rgba(18, 27, 54, 0.96), rgba(10, 16, 36, 0.96));
}

.page-about .about-channel--main {
  border-left: 3px solid var(--cyan);
}

.page-about .about-channel--backup {
  border-left: 3px solid var(--gold);
}

.page-about .about-channel__tag {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist-52);
}

.page-about .about-channel__title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-channel p:last-child {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.85;
  color: var(--mist-52);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.page-about .about-mile::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--mist-34);
  border-radius: 50%;
  background: var(--night);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-mile::after {
  content: "";
  position: absolute;
  inset: 0 0 0 -1px;
  background: linear-gradient(90deg, var(--about-cyan-soft), transparent 64%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s var(--ease);
}

.page-about .about-mile:hover::before,
.page-about .about-mile:focus-within::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(61, 240, 208, 0.14);
}

.page-about .about-mile:hover::after,
.page-about .about-mile:focus-within::after {
  opacity: 1;
}

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

.page-about .about-mile__year {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 1.06rem;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-mile__title {
  margin: 5px 0 6px;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-mile__desc {
  margin: 0;
  max-width: 62ch;
  font-size: 0.84rem;
  line-height: 1.85;
  color: var(--mist-52);
}

@media (min-width: 820px) {
  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }
  .page-about .about-mile__year {
    font-size: 1.2rem;
  }
}

/* ---------- 覆盖与伙伴 ---------- */

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

@media (min-width: 820px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-metric {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px 18px;
  border: 1px solid var(--about-line);
  border-radius: 18px;
  background: linear-gradient(150deg, rgba(18, 27, 54, 0.96), rgba(10, 16, 36, 0.96));
}

.page-about .about-metric__num {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 2.3rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-metric__title {
  margin: 2px 0 8px;
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-metric__desc {
  margin: 0;
  font-size: 0.83rem;
  line-height: 1.85;
  color: var(--mist-52);
}

/* ---------- 更新节奏表 ---------- */

.page-about .about-cadence {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: 16px;
  overflow: hidden;
}

.page-about .about-cadence li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
  padding: 13px 16px;
  background: var(--ink);
}

.page-about .about-cadence__k {
  flex: 0 0 auto;
  min-width: 88px;
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-cadence__v {
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--mist-72);
}

/* ---------- 结尾行动区 ---------- */

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

.page-about .about-cta__inner {
  position: relative;
  padding: 32px 22px 30px;
  border: 1px solid var(--about-line-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(84% 140% at 92% 0%, rgba(226, 59, 59, 0.22), transparent 62%),
    linear-gradient(160deg, #141f3e, #0c1226);
  overflow: hidden;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.28rem, 4.6vw, 1.95rem);
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 58ch;
  font-size: 0.89rem;
  line-height: 1.9;
  color: var(--mist-72);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-about .about-cta__inner {
    padding: 44px 40px 42px;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-role::after,
  .page-about .about-mile::before,
  .page-about .about-mile::after {
    transition: none;
  }
  .page-about .about-role:hover,
  .page-about .about-role:focus-within {
    transform: none;
  }
}