.page-about {
  --about-ink-soft: #0D1B3A;
  --about-body-text: rgba(230, 238, 255, 0.82);
  --about-dim-text: rgba(230, 238, 255, 0.68);
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(26px, 4.6vw, 52px) clamp(40px, 6vw, 76px);
  border-bottom: 1px solid var(--line-2);
  background:
    radial-gradient(120% 130% at 88% -12%, rgba(0, 229, 208, 0.17), transparent 58%),
    radial-gradient(95% 95% at 4% 112%, rgba(139, 92, 246, 0.15), transparent 62%),
    linear-gradient(180deg, #07333A 0%, #050B1F 78%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(0, 229, 208, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 229, 208, 0.07) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin-bottom: clamp(26px, 4vw, 50px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-2);
}

.page-about .breadcrumb__list li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  padding-inline: 9px;
  color: var(--line-2);
}

.page-about .breadcrumb__list a {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.14s ease, border-color 0.14s ease;
}

.page-about .breadcrumb__list a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  max-width: 15em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 6.1vw, 66px);
  line-height: 1.07;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(28px, 4.2vw, 46px);
  max-width: 44em;
  font-family: var(--font-editorial);
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.82;
  color: rgba(230, 238, 255, 0.8);
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: 760px;
  margin: 0;
  background: var(--line-2);
  border: 1px solid var(--line-2);
}

.page-about .about-hero__meta > div {
  padding: 14px 16px;
  background: rgba(5, 11, 31, 0.74);
}

.page-about .about-hero__meta dt {
  margin: 0 0 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-2);
}

.page-about .about-hero__meta dd {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

/* ---------- 双栏骨架 ---------- */

.page-about .about-body {
  padding-block: clamp(34px, 5.5vw, 74px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 60px);
}

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

/* ---------- 粘性章节索引 ---------- */

.page-about .about-index {
  border-top: 1px solid var(--line-2);
  padding-top: 14px;
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-2);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.14s ease, border-color 0.14s ease, background-color 0.14s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0, 229, 208, 0.06);
}

.page-about .about-index__link .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--violet);
}

.page-about .about-index__link:hover .num {
  color: var(--cyan);
}

/* ---------- 章节通用 ---------- */

.page-about .about-sec {
  scroll-margin-top: calc(var(--head-h) + 24px);
  padding-block: clamp(26px, 3.8vw, 46px);
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: none;
}

.page-about .about-sec__idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.17em;
  color: var(--cyan);
}

.page-about .about-sec__title {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  max-width: 20em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.022em;
}

.page-about .about-prose {
  max-width: 42em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-body-text);
}

.page-about .about-prose p {
  margin: 0 0 1em;
}

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

.page-about .about-prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 208, 0.38);
  transition: border-color 0.14s ease;
}

.page-about .about-prose a:hover {
  border-bottom-color: var(--cyan);
}

.page-about a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0 0 clamp(22px, 3vw, 34px);
}

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

.page-about .about-duo .about-figure,
.page-about .net .about-figure {
  margin: 0;
}

/* ---------- 角色分工 ---------- */

.page-about .roles {
  display: grid;
  gap: 1px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-2);
  border: 1px solid var(--line-2);
}

.page-about .roles__item {
  position: relative;
  padding: 20px 18px;
  background: var(--ink-2);
  transition: background-color 0.16s ease;
}

.page-about .roles__item::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.18s ease;
}

.page-about .roles__item:hover,
.page-about .roles__item:focus-within {
  background: var(--about-ink-soft);
}

.page-about .roles__item:hover::before,
.page-about .roles__item:focus-within::before {
  transform: scaleY(1);
}

.page-about .roles__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-about .roles__name {
  margin: 8px 0 4px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .roles__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--cyan);
}

.page-about .roles__text {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-dim-text);
}

/* ---------- 评测标准色带 ---------- */

.page-about .about-sec--indigo {
  padding-inline: clamp(20px, 3vw, 36px);
  border: 1px solid rgba(139, 92, 246, 0.24);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(139, 92, 246, 0.16), transparent 62%),
    linear-gradient(180deg, rgba(26, 16, 56, 0.94), rgba(5, 11, 31, 0.5));
}

.page-about .about-duo {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .dims {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-2);
  border: 1px solid var(--line-2);
}

.page-about .dims__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  padding: 16px 18px;
  background: rgba(10, 20, 46, 0.92);
  transition: background-color 0.16s ease, box-shadow 0.16s ease;
}

.page-about .dims__item:hover,
.page-about .dims__item:focus-within {
  background: rgba(0, 229, 208, 0.07);
  box-shadow: inset 2px 0 0 var(--cyan);
}

.page-about .dims__num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--violet);
}

.page-about .dims__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

.page-about .dims__text {
  grid-column: 2;
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--about-dim-text);
}

/* ---------- 版本时间线 ---------- */

.page-about .tl {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--line-2);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(20px, 2.6vw, 28px);
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -26.5px;
  top: 7px;
  width: 8px;
  height: 8px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transition: background-color 0.14s ease, box-shadow 0.14s ease;
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(0, 229, 208, 0.14);
}

.page-about .tl__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.page-about .tl__ver {
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid var(--line-2);
}

.page-about .tl__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .tl__text {
  max-width: 40em;
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-dim-text);
}

.page-about .tl__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 208, 0.38);
}

.page-about .tl__text a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 服务网络 ---------- */

.page-about .about-sec--teal {
  padding-inline: clamp(20px, 3vw, 36px);
  border: 1px solid rgba(0, 229, 208, 0.2);
  background:
    radial-gradient(95% 120% at 0% 100%, rgba(0, 229, 208, 0.13), transparent 60%),
    linear-gradient(180deg, rgba(6, 47, 53, 0.94), rgba(5, 11, 31, 0.5));
}

.page-about .net {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .net__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(18px, 2.4vw, 24px);
  background: var(--line-2);
  border: 1px solid var(--line-2);
}

.page-about .net__stat {
  padding: 14px 14px 16px;
  background: rgba(6, 47, 53, 0.82);
}

.page-about .net__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .net__lab {
  margin: 7px 0 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-2);
}

/* ---------- 合作与承诺 ---------- */

.page-about .about-sec--wine {
  padding-inline: clamp(20px, 3vw, 36px);
  border: 1px solid rgba(255, 122, 26, 0.22);
  background:
    radial-gradient(100% 130% at 100% 0%, rgba(255, 122, 26, 0.13), transparent 62%),
    linear-gradient(150deg, rgba(59, 14, 31, 0.92), rgba(5, 11, 31, 0.55));
}

.page-about .about-cta {
  margin-top: clamp(24px, 3.4vw, 36px);
  padding: clamp(20px, 3.2vw, 34px);
  border: 1px solid var(--line-2);
  background: linear-gradient(180deg, rgba(10, 20, 46, 0.95), rgba(5, 11, 31, 0.6));
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 26px);
  letter-spacing: -0.014em;
}

.page-about .about-cta__text {
  max-width: 38em;
  margin: 0 0 clamp(16px, 2.2vw, 22px);
  font-size: 15px;
  line-height: 1.72;
  color: rgba(230, 238, 255, 0.74);
}

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

/* ---------- 显现 ---------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .net {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.8fr);
    align-items: center;
  }

  .page-about .about-duo {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 232px minmax(0, 1fr);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--head-h) + 20px);
    align-self: start;
    border-top: none;
    padding-top: 0;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list li + li {
    margin-top: 2px;
  }

  .page-about .about-index__link {
    display: flex;
    justify-content: flex-start;
    padding: 9px 0 9px 14px;
    border: none;
    border-left: 2px solid var(--line);
    border-radius: 0;
    font-size: 14px;
    white-space: normal;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: transparent;
  }
}

@media (min-width: 1180px) {
  .page-about .about-prose {
    font-size: 16.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .roles__item,
  .page-about .roles__item::before,
  .page-about .dims__item,
  .page-about .tl__item::before,
  .page-about .about-index__link {
    transition: none;
  }
}