/* ===== 平台介绍 · 页面专属样式（作用域 .page-about） ===== */

.page-about {
  --about-rail: 272px;
  --about-gap: clamp(26px, 4vw, 56px);
  background:
    radial-gradient(920px 520px at 86% -8%, rgba(30, 138, 103, .34), transparent 62%),
    radial-gradient(620px 420px at 4% 10%, rgba(31, 79, 216, .16), transparent 60%),
    var(--ink);
  color: var(--mist);
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: 18px;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--stat-inv);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin: 0 10px;
  color: rgba(200, 241, 58, .5);
}

.page-about .breadcrumbs a {
  color: var(--neon);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  text-decoration: underline;
}

.page-about .breadcrumbs li[aria-current="page"] {
  color: var(--mist-2);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(46px, 7vw, 86px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(200, 241, 58, .5), transparent);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 44ch;
  color: var(--mist-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-hard);
  background: linear-gradient(155deg, var(--ink-2), var(--ink-3));
}

.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 61, 46, 0) 55%, rgba(11, 61, 46, .6) 100%);
}

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

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding: clamp(40px, 6vw, 84px) 0 clamp(54px, 8vw, 108px);
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 58%, var(--ink-3) 100%);
}

.page-about .about-body__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }
}

/* ---------- 左栏 ---------- */
.page-about .about-rail__inner {
  display: grid;
  gap: 20px;
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .about-rail__inner {
    position: sticky;
    top: 128px;
  }
}

.page-about .about-rail__card {
  padding: 20px;
  background: rgba(18, 82, 63, .74);
  border: var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-rail__label,
.page-about .about-toc__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--neon);
}

.page-about .about-metrics {
  display: grid;
  gap: 15px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-metrics__item {
  display: grid;
  gap: 3px;
  padding-left: 12px;
  border-left: 2px solid rgba(200, 241, 58, .35);
}

.page-about .about-metrics__num {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 25px;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--neon);
}

.page-about .about-metrics__cap {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--stat-inv);
}

.page-about .about-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid rgba(200, 241, 58, .18);
}

.page-about .about-toc__link {
  display: block;
  margin-left: -2px;
  padding: 9px 12px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--mist-2);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .26s var(--ease), border-color .26s var(--ease), background-color .26s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--neon);
  border-left-color: var(--neon);
  background: rgba(200, 241, 58, .08);
}

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

/* ---------- 右栏长文 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(38px, 6vw, 72px);
  min-width: 0;
}

.page-about .about-section {
  min-width: 0;
  scroll-margin-top: 130px;
}

.page-about .about-section__title {
  display: flex;
  gap: 14px;
  align-items: baseline;
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 33px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--mist);
}

.page-about .about-section__no {
  flex: none;
  font-family: var(--font-num);
  font-size: clamp(14px, 1.6vw, 17px);
  font-weight: 600;
  color: var(--neon);
}

.page-about .about-section p {
  margin: 0 0 16px;
  max-width: 46em;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--mist-2);
}

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

/* ---------- 引用块 ---------- */
.page-about .about-quote {
  margin: 26px 0;
  padding: 22px 26px;
  background: var(--ink-2);
  border: var(--edge);
  border-left: 6px solid var(--neon);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 38em;
  font-family: var(--font-head);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 数据条 ---------- */
.page-about .about-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
  margin: 26px 0;
  padding: 22px;
  background: var(--ink-3);
  border: var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard-sm);
}

@media (min-width: 700px) {
  .page-about .about-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-strip__item {
  position: relative;
  min-width: 0;
  padding-left: 12px;
  border-left: 2px solid rgba(200, 241, 58, .3);
}

.page-about .about-strip__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--neon);
}

.page-about .about-strip__cap {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--stat-inv);
}

.page-about .about-strip__tip {
  position: absolute;
  left: 12px;
  bottom: calc(100% + 12px);
  z-index: 4;
  width: max-content;
  max-width: 200px;
  padding: 8px 11px;
  border-radius: var(--radius);
  background: var(--neon);
  color: var(--ink-4);
  font-size: 12px;
  line-height: 1.5;
  box-shadow: var(--shadow-hard-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  pointer-events: none;
  transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s var(--ease);
}

.page-about .about-strip__item:hover .about-strip__tip,
.page-about .about-strip__item:focus-within .about-strip__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

@media (hover: none), (max-width: 640px) {
  .page-about .about-strip__tip {
    position: static;
    width: auto;
    max-width: none;
    padding: 6px 0 0;
    background: none;
    box-shadow: none;
    color: var(--stat-inv);
    opacity: 1;
    visibility: visible;
    transform: none;
  }
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 28px 0;
  border: var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-3);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stat-inv);
  border-top: 1px solid rgba(200, 241, 58, .16);
}

/* ---------- 流程时间线 ---------- */
.page-about .about-steps {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  position: relative;
  padding: 0 0 26px 36px;
}

.page-about .about-steps__item::before {
  content: "";
  box-sizing: border-box;
  position: absolute;
  left: 0;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--neon);
  border: 3px solid var(--ink-2);
  box-shadow: 0 0 0 2px rgba(200, 241, 58, .32);
}

.page-about .about-steps__item::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 26px;
  bottom: 4px;
  width: 2px;
  background: rgba(200, 241, 58, .28);
}

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

.page-about .about-steps__item:last-child::after {
  display: none;
}

.page-about .about-steps__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--neon);
}

.page-about .about-section .about-steps__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist-2);
}

/* ---------- 用法提示块 ---------- */
.page-about .about-note {
  margin: 26px 0;
  padding: 18px 20px;
  border: 2px dashed rgba(31, 79, 216, .6);
  border-radius: var(--radius);
  background: rgba(31, 79, 216, .14);
}

.page-about .about-note__k {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon-soft);
}

.page-about .about-section .about-note p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 岗位卡片 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-roles__item {
  padding: 16px 18px;
  background: rgba(10, 15, 13, .45);
  border: 1px solid rgba(200, 241, 58, .22);
  border-top: 4px solid var(--neon);
  border-radius: var(--radius);
}

.page-about .about-roles__k {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--neon);
}

.page-about .about-section .about-roles__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist-2);
}

/* ---------- 升级节点折叠面板 ---------- */
.page-about .about-upgrades {
  margin-top: 22px;
  display: grid;
  gap: 12px;
}

.page-about .about-upgrade {
  border: var(--edge);
  border-radius: var(--radius);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .about-upgrade__sum {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--mist);
  transition: background-color .24s var(--ease);
}

.page-about .about-upgrade__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-upgrade__sum:hover {
  background: rgba(200, 241, 58, .07);
}

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

.page-about .about-upgrade__sum::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-num);
  font-size: 20px;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-upgrade[open] .about-upgrade__sum::after {
  content: "–";
}

.page-about .about-upgrade__k {
  flex: none;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--neon);
}

.page-about .about-upgrade__body {
  padding: 0 18px 18px;
}

.page-about .about-section .about-upgrade__body p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist-2);
}

/* ---------- 结尾去向 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 52px);
  padding: clamp(24px, 4vw, 40px);
  background: var(--ink-3);
  border: var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__title {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--mist);
}

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

@media (min-width: 640px) {
  .page-about .about-cta__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-cta__item {
  display: block;
  padding: 16px 18px;
  background: rgba(18, 82, 63, .5);
  border: 1px solid rgba(200, 241, 58, .22);
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform .28s var(--ease), border-color .28s var(--ease),
    background-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .about-cta__item:hover,
.page-about .about-cta__item:focus-visible {
  transform: translateY(-3px);
  border-color: var(--neon);
  background: rgba(18, 82, 63, .8);
  box-shadow: var(--shadow-hard-sm);
}

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

.page-about .about-cta__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--neon);
}

.page-about .about-cta__d {
  display: block;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist-2);
}