@charset "UTF-8";
/* =============================================================================
   九方创想云科技有限公司 — about.css
   关于页专属视觉：企业档案 + AI 能力图谱
   ========================================================================== */

.about-page {
  --about-accent: #dceaf8;
  --about-accent-soft: rgba(207, 226, 245, 0.1);
  --about-accent-line: rgba(207, 226, 245, 0.34);
  --about-panel: #0b0d10;
  --about-panel-raised: #101318;
  --about-record: rgba(205, 221, 238, 0.72);
  --about-nav-h: 54px;
}

.about-page .section {
  isolation: isolate;
}

/* text-wrap: pretty 只避免"最后一个单词"落单，中文按字断行，对它几乎无效。
   以下短文案（各 ≤3 行）改用 balance，把末行的孤字平摊掉。
   注意：技术能力那张三栏矩阵不在此列——那里各行是靠"每条描述都占两行"
   才横向对齐的，balance 会让个别条目收成一行，反而打断三栏的横线节奏。 */
.about-hero .lead,
.about-page .sec-sub,
.about-strategy-step__desc,
.about-boundary-panel p,
.about-service-step__body p,
.about-team-item p,
.about-archive-timeline p,
.about-archive-list p {
  text-wrap: balance;
}

.about-section {
  scroll-margin-top: calc(var(--header-h) + var(--about-nav-h) + 20px);
}

.about-kicker {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--text-4);
}

/* -----------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.about-hero {
  min-height: clamp(700px, 88svh, 760px);
  padding-top: calc(var(--header-h) + clamp(64px, 8vw, 112px));
  padding-bottom: clamp(30px, 4vw, 54px);
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent 0, transparent calc(50% - 1px), rgba(255, 255, 255, 0.035) 50%, transparent calc(50% + 1px)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.024) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.024) 1px, transparent 1px);
  background-size: 100% 100%, 72px 72px, 72px 72px;
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.42) 68%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.42) 68%, transparent 100%);
}

.about-hero::after {
  top: -12%;
  left: 62%;
  width: min(820px, 95vw);
  height: 680px;
  background: radial-gradient(ellipse at center, rgba(213, 232, 249, 0.18) 0%, rgba(213, 232, 249, 0.065) 38%, transparent 72%);
}

.about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(360px, 0.96fr);
  align-items: center;
  gap: clamp(32px, 6vw, 88px);
  min-height: 480px;
}

.about-hero__copy {
  max-width: 760px;
}

.about-hero h1 {
  max-width: 780px;
  margin-bottom: 26px;
  font-size: clamp(38px, 5.2vw, 68px);
  line-height: 1.12;
  letter-spacing: 0;
  color: var(--text);
}

.about-hero .lead {
  max-width: 700px;
  margin: 0;
  font-size: clamp(15px, 1.45vw, 17px);
  line-height: 1.9;
  color: var(--text-2);
}

.about-hero__signals {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--text-3);
}

.about-hero__signals span {
  position: relative;
  padding-left: 28px;
  white-space: nowrap;
}

.about-hero__signals span::before {
  content: attr(data-index);
  position: absolute;
  top: 0;
  left: 0;
  color: var(--about-accent);
}

.about-hero__visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 480px;
  padding: 18px 0;
}

.about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 10% 4%;
  border-radius: 50%;
  background: radial-gradient(circle at 52% 48%, rgba(215, 232, 248, 0.11), transparent 66%);
  filter: blur(12px);
  pointer-events: none;
}

/* -----------------------------------------------------------------------------
   Hero 插画：等轴测全息投影
   投影几何（等轴测 X=(x−z)·0.866K、Y=(x+z)·0.5K−yK）在生成标记时就算好，
   写死在 markup 里；这里只负责画法与动效。
   -------------------------------------------------------------------------- */
/* -----------------------------------------------------------------------------
   Hero 插画：等轴测全息汇聚
   -----------------------------------------------------------------------------
   全站的语言是 1px 细线与发丝分隔线，所以这里**不用任何带明暗渐变的实体块面**——
   上一版用三片受光侧面画出六棱柱，结果像一口放在托盘上的六角桶：材质在这页别处
   根本不存在。全息体本就该以线框呈现，也才是这页自己的画法。

   几何（等轴测 X=(x−z)·0.866K、Y=(x+z)·0.5K−yK）由 tools/gen-about-hero-holo.mjs
   算好后写死在标记里，这里只负责画法与动效。
   -------------------------------------------------------------------------- */
/* -----------------------------------------------------------------------------
   Hero 插画：星尘汇聚成徽记
   -----------------------------------------------------------------------------
   两层：星野（静态、三种粒径）＋ 粒子（从画布四周飞入，聚成 logo 的「标记」）。
   粒子坐标由 tools/gen-about-hero-holo.mjs 从 logo 的 SVG 采样并做透视投影后
   写死在标记里，这里只负责画法与动效。

   关键取舍：动画写在 **from** 而不是 to —— 元素的基础状态就是"已归位"，
   `animation-fill-mode: backwards` 让起始态在延迟期间生效。这样一旦动画被
   禁用（prefers-reduced-motion）或不被支持，粒子直接停在最终位置，
   不会散在画布上。降级是结构自带的，不靠额外兜底。
   -------------------------------------------------------------------------- */
.about-system-map {
  position: relative;
  z-index: 1;
  width: min(100%, 620px);
  height: auto;
  color: var(--about-accent);
  overflow: hidden;
  /* 指针视差：短过渡 ⇒ 柔和跟随而非硬跳。窄屏的 scale 走同一属性，
     但脚本只在精确指针设备上写入内联 transform，两者不会打架。 */
  transition: transform 0.25s ease-out;
}

/* 星野：零长线段 + 圆头描边当点，三种粒径各一条 path。
   每档一条元素、各自缓慢呼吸 —— 只有 3 个动画元素，代价可忽略。 */
.about-map__dust path {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
  animation: about-dust-breathe var(--dur, 8s) ease-in-out infinite;
  animation-delay: var(--del, 0s);
}

/* 徽记背后的光晕 */
.about-map__bloom {
  fill: url("#about-holo-bloom");
}

/* 归位后的缓慢起伏。transform-origin 用用户单位写死，不依赖 bbox */
.about-map__float {
  transform-origin: 310px 262px;
  animation: about-star-float 11s ease-in-out infinite;
}

.about-map__stars .star {
  fill: #ffffff;
  animation-name: about-star-in;
  animation-duration: 1.3s;
  animation-timing-function: cubic-bezier(0.22, 0.61, 0.36, 1);
  animation-delay: var(--d);
  animation-fill-mode: backwards;
}

/* 约 1/14 的粒子在归位后缓慢明灭。两段动画用逗号并列：
   前一段只跑一次且 backwards 填充，后一段无限循环 —— 归位前不受影响。 */
.about-map__stars .star--live {
  animation-name: about-star-in, about-star-live;
  animation-duration: 1.3s, var(--bd, 7s);
  animation-timing-function: cubic-bezier(0.22, 0.61, 0.36, 1), ease-in-out;
  animation-delay: var(--d), calc(var(--d) + 1.3s);
  animation-fill-mode: backwards, none;
  animation-iteration-count: 1, infinite;
}

.about-index-bar {
  position: sticky;
  top: var(--header-h);
  z-index: 38;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.88);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

.about-index-nav {
  display: flex;
  flex-wrap: nowrap;
  gap: 0;
  margin: 0;
  overflow-x: auto;
  scrollbar-width: none;
  mask-image: linear-gradient(90deg, #000 0%, #000 calc(100% - 34px), transparent 100%);
  -webkit-mask-image: linear-gradient(90deg, #000 0%, #000 calc(100% - 34px), transparent 100%);
}

.about-index-nav::-webkit-scrollbar {
  display: none;
}

.about-index-nav a {
  position: relative;
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  min-height: var(--about-nav-h);
  padding: 0 16px;
  border: 0;
  border-right: 1px solid var(--line-soft);
  border-radius: 0;
  background: transparent;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--text-3);
  transition: color var(--t), background var(--t);
  white-space: nowrap;
}

.about-index-nav a:first-child {
  padding-left: 0;
}

.about-index-nav a:hover {
  border-color: var(--line-soft);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
}

.about-index-nav a::after {
  content: "";
  position: absolute;
  right: 16px;
  bottom: -1px;
  left: 16px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--about-accent), transparent);
  transform: scaleX(0);
  transition: transform 0.36s var(--ease);
}

.about-index-nav a.is-active {
  background: linear-gradient(180deg, rgba(207, 226, 245, 0.065), transparent);
  color: var(--text);
}

.about-index-nav a.is-active::after {
  transform: scaleX(1);
}

/* 宽屏下均分父容器宽度，窄屏继续保留横向滚动。 */
@media (min-width: 1200px) {
  .about-index-nav {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    mask-image: none;
    -webkit-mask-image: none;
  }
}

/* -----------------------------------------------------------------------------
   公司介绍
   -------------------------------------------------------------------------- */
/* 全部章节共用同一套标题结构：左栏为"眉标 + 章节标记"两行，右栏为 h2 与说明。
   两条细横线带出"文件章节"的节奏，与档案母题一致。 */
.about-sec-head {
  position: relative;
  display: grid;
  grid-template-columns: minmax(190px, 0.42fr) minmax(0, 1.58fr);
  column-gap: clamp(34px, 5vw, 72px);
  max-width: none;
  padding: 24px 0 26px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.about-sec-head::before {
  content: attr(data-chapter);
  grid-column: 1;
  grid-row: 2;
  align-self: start;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.13em;
  color: var(--text-4);
}

.about-sec-head .eyebrow {
  grid-column: 1;
  grid-row: 1;
  align-self: start;
  margin: 0;
}

.about-sec-head h2 {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
}

.about-sec-head .sec-sub {
  grid-column: 2;
  grid-row: 2;
  margin-top: 10px;
}

.about-record-note {
  align-items: center;
  border-left-color: rgba(207, 226, 245, 0.5);
  background: rgba(207, 226, 245, 0.035);
}

.about-data-state {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--about-record);
  font-size: 12px;
  white-space: nowrap;
}

.about-data-state::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  border: 1px solid rgba(207, 226, 245, 0.5);
  border-radius: 50%;
  background: rgba(207, 226, 245, 0.08);
}

.about-profile {
  display: grid;
  grid-template-columns: minmax(0, 1.16fr) minmax(340px, 0.84fr);
  align-items: start;
  gap: clamp(42px, 6vw, 88px);
}

.about-profile__statement {
  min-width: 0;
}

.about-profile__statement .article {
  max-width: 720px;
}

.about-profile__statement .notice {
  margin-top: 30px;
}

.about-dossier {
  position: relative;
  padding: 26px 26px 22px;
  border: 1px solid var(--line);
  border-top-color: var(--about-accent-line);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(145deg, rgba(207, 226, 245, 0.055), transparent 50%),
    var(--about-panel-raised);
  overflow: hidden;
}

.about-dossier::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42px;
  height: 1px;
  background: var(--about-accent);
  box-shadow: 0 0 18px rgba(207, 226, 245, 0.48);
}

.about-dossier__head,
.about-dossier__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--text-4);
}

.about-dossier__status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-3);
}

.about-dossier__status::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 12px rgba(55, 200, 138, 0.52);
}

.about-dossier__name {
  margin: 24px 0 20px;
  font-size: 20px;
  color: var(--text);
}

.about-dossier__list {
  margin: 0;
}

.about-dossier__list > div {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 16px;
  padding: 13px 0;
  border-top: 1px solid var(--line-soft);
}

.about-dossier__list dt {
  font-size: 13px;
  color: var(--text-4);
}

.about-dossier__list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-2);
}

.about-dossier__foot {
  justify-content: flex-start;
  margin-top: 16px;
}

.about-dossier__line {
  width: 36px;
  height: 1px;
  background: var(--about-accent-line);
}

.about-profile__bottom {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: clamp(34px, 5vw, 72px);
  margin-top: clamp(54px, 7vw, 88px);
}

.about-problem-panel,
.about-boundary-panel {
  position: relative;
  padding: 28px 0 0;
  border-top: 1px solid var(--line);
}

.about-problem-panel::before,
.about-boundary-panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 24%;
  height: 1px;
  background: linear-gradient(90deg, var(--about-accent), transparent);
  opacity: 0.65;
}

.about-panel-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--text-4);
}

.about-problem-panel h3,
.about-boundary-panel h3 {
  margin-bottom: 18px;
  font-size: clamp(21px, 2.2vw, 28px);
}

.about-problem-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-problem-list li {
  position: relative;
  margin: 0;
  padding: 12px 0 12px 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--text-2);
}

.about-problem-list li::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 1px;
  width: 5px;
  height: 5px;
  border: 1px solid var(--about-accent-line);
  border-radius: 50%;
}

.about-boundary-panel p {
  max-width: 560px;
  font-size: 15.5px;
  line-height: 1.9;
}

/* -----------------------------------------------------------------------------
   企业使命
   -------------------------------------------------------------------------- */
.about-principle-rail {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.about-principle {
  position: relative;
  min-width: 0;
  padding: 30px clamp(22px, 3vw, 38px) 34px;
  border-right: 1px solid var(--line);
  transition: background var(--t), transform var(--t);
}

.about-principle:last-child {
  border-right: 0;
}

.about-principle::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--about-accent);
  transition: width 0.55s var(--ease);
}

.about-principle:hover {
  background: linear-gradient(180deg, rgba(207, 226, 245, 0.05), transparent 72%);
}

.about-principle:hover::before {
  width: 100%;
}

/* 编号移除后图标独自留在右端会空出一整条，改为左对齐作为卡片的起始标记，
   与其他区块的左对齐正文形成同一条视线。 */
.about-principle__top {
  display: flex;
  align-items: center;
  margin-bottom: 34px;
}

.about-principle__icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--text-2);
  background: rgba(255, 255, 255, 0.018);
}

.about-principle__icon svg {
  width: 20px;
  height: 20px;
}

.about-principle h3 {
  margin-bottom: 12px;
  font-size: clamp(22px, 2.2vw, 28px);
}

.about-principle p {
  max-width: 360px;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-3);
}

/* -----------------------------------------------------------------------------
   AI 战略
   -------------------------------------------------------------------------- */
.about-strategy-track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 26px;
  padding-top: 26px;
}

.about-strategy-step {
  position: relative;
  min-width: 0;
  padding-top: 62px;
}

/* 连接线只跨"本圆点右缘 → 下个圆点左缘"，与栅格宽度解耦，
   不再像整条轨道那样越过最后一个圆点悬空。 */
.about-strategy-step:not(:last-child)::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 62px;
  right: -26px;
  height: 1px;
  background: linear-gradient(90deg, var(--about-accent-line), rgba(207, 226, 245, 0.1));
}

.about-strategy-step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 20px;
  right: -17px;
  z-index: 1;
  width: 8px;
  height: 8px;
  border-top: 1px solid var(--about-accent-line);
  border-right: 1px solid var(--about-accent-line);
  transform: rotate(45deg);
}

.about-step-number {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--about-accent-line);
  border-radius: 50%;
  background: var(--bg);
  box-shadow: 0 0 0 8px rgba(0, 0, 0, 0.92), 0 0 28px rgba(207, 226, 245, 0.08);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--about-accent);
}

.about-strategy-step:nth-child(2) .about-step-number {
  border-color: rgba(220, 234, 248, 0.52);
}

.about-strategy-step:nth-child(3) .about-step-number {
  border-color: var(--about-accent);
  background: var(--about-accent);
  color: var(--bg);
  box-shadow: 0 0 0 8px rgba(0, 0, 0, 0.92), 0 0 28px rgba(207, 226, 245, 0.22);
}

.about-strategy-step__body {
  position: relative;
  padding-top: 16px;
}

.about-strategy-step__body::before {
  content: "";
  position: absolute;
  top: -14px;
  left: 23px;
  width: 1px;
  height: 14px;
  background: linear-gradient(180deg, var(--about-accent-line), rgba(207, 226, 245, 0.08));
}

.about-step-label {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-4);
}

.about-strategy-step h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2vw, 26px);
}

.about-strategy-step__desc {
  max-width: 360px;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-3);
}

.about-strategy-step__gate {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding-top: 13px;
  border-top: 1px solid var(--line-soft);
}

.about-strategy-step__gate > div {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
}

.about-strategy-step__gate dt,
.about-strategy-step__gate dd {
  margin: 0;
}

.about-strategy-step__gate dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-4);
  white-space: nowrap;
}

.about-strategy-step__gate dd {
  font-size: 12px;
  line-height: 1.65;
  color: var(--text-2);
}

.about-strategy-foundation {
  display: grid;
  grid-template-columns: minmax(200px, 0.72fr) minmax(0, 2.28fr);
  align-items: center;
  gap: clamp(28px, 4vw, 64px);
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.about-strategy-foundation__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.about-strategy-foundation__head span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-4);
}

.about-strategy-foundation__head strong {
  font-size: 18px;
  font-weight: 500;
  color: var(--text);
}

.about-strategy-foundation ul {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-strategy-foundation li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  color: var(--text-3);
}

.about-strategy-foundation li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 6px;
  height: 1px;
  background: var(--about-accent-line);
}

.about-policy {
  position: relative;
  padding: 26px 28px 26px 32px;
  border: 1px solid var(--line);
  border-left: 0;
  border-radius: var(--radius-sm);
  background:
    linear-gradient(90deg, rgba(207, 226, 245, 0.065), transparent 46%),
    var(--surface);
  overflow: hidden;
}

.about-policy::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--about-accent), rgba(207, 226, 245, 0.08));
}

/* -----------------------------------------------------------------------------
   技术能力
   -------------------------------------------------------------------------- */
.about-tech-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(30px, 4vw, 56px);
}

.about-tech-group {
  min-width: 0;
}

.about-tech-group__head {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  min-height: 78px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-strong);
}

.about-tech-group__no {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-3);
}

.about-tech-group__head h3 {
  margin: 0;
  font-size: 20px;
}

.about-tech-group__head .about-kicker {
  margin: 0 0 2px;
  font-size: 12px;
}

.about-tech-items {
  position: relative;
}

/* 去掉行首编号后，描述列宽由 303px 增至 347px，个别描述因此收成一行，
   三栏的横线就不再齐平。这里把行高固定为"两行描述"的高度，显式保住矩阵的
   横向节奏（原先是靠九条描述恰好都占两行才对齐的）。 */
.about-tech-item {
  min-width: 0;
  min-height: 118px;
  padding: 19px 0 20px;
  border-bottom: 1px solid var(--line-soft);
  transition: transform var(--t), background var(--t);
}

.about-tech-item h4 {
  margin: 0 0 6px;
  font-size: 16px;
  transition: color var(--t);
}

.about-tech-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-3);
}

.about-tech-item:hover {
  background: rgba(255, 255, 255, 0.02);
  transform: translateX(4px);
}

.about-tech-item:hover h4 {
  color: var(--about-accent);
}

/* -----------------------------------------------------------------------------
   服务能力
   -------------------------------------------------------------------------- */
.about-service-track {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.about-service-step {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background:
    linear-gradient(145deg, rgba(207, 226, 245, 0.045), transparent 48%),
    var(--surface);
  overflow: hidden;
  transition: border-color var(--t), transform var(--t), background var(--t);
}

.about-service-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--about-accent);
  transition: width 0.55s var(--ease);
}

.about-service-step:hover {
  border-color: var(--about-accent-line);
  transform: translateY(-3px);
}

.about-service-step:hover::before {
  width: 100%;
}

.about-service-step__head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 24px 24px 20px;
}

.about-service-step__head h3 {
  margin: 0;
  font-size: 20px;
}

/* 分隔线位置由该排最高的表头决定（表头均为单行），同排两张卡因此严格对齐；
   多余空间落在单元格自身的 padding 内。 */
.about-service-step__body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-soft);
}

.about-service-step__body > div {
  min-width: 0;
  padding: 20px 24px 24px;
}

.about-service-step__body > div + div {
  border-left: 1px solid var(--line-soft);
}

.about-service-label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--text-4);
}

.about-service-step__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-3);
}

/* -----------------------------------------------------------------------------
   团队能力
   -------------------------------------------------------------------------- */
/* 角色是并列集合而非序列，因此改为整行列表：角色 / 职责 / 层级三层对齐。
   7 项铺 4 列会空出一格并让底边线中断，行列表同时解决这个问题。 */
.about-team-list {
  border-top: 1px solid var(--line-strong);
}

.about-team-item {
  display: grid;
  grid-template-columns: minmax(190px, 0.78fr) minmax(0, 1.42fr) minmax(140px, 0.5fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: baseline;
  min-width: 0;
  padding: 20px 0 21px;
  border-bottom: 1px solid var(--line);
  transition: background var(--t);
}

.about-team-item:hover {
  background: linear-gradient(90deg, rgba(207, 226, 245, 0.04), transparent 74%);
}

.about-team-item h3 {
  margin: 0;
  font-size: 17px;
}

.about-team-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-3);
}

.about-team-item__note {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-4);
  text-align: right;
}

.about-team-item__note::before {
  content: "";
  flex: 0 0 auto;
  width: 16px;
  height: 1px;
  background: var(--about-accent-line);
}

/* -----------------------------------------------------------------------------
   发展历程 / 合作伙伴 / 资质荣誉
   -------------------------------------------------------------------------- */
.about-archive-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.88fr) minmax(0, 0.84fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.about-archive-panel {
  min-width: 0;
  padding: 28px 26px 30px;
  border-right: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + var(--about-nav-h) + 20px);
}

.about-archive-panel:last-child {
  border-right: 0;
}

.about-archive-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  align-items: start;
  min-height: 112px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.about-archive-head .about-kicker {
  margin: 1px 0 2px;
}

.about-archive-head h3 {
  margin: 0;
  font-size: 20px;
}

.about-archive-head .about-data-state {
  grid-column: 1 / -1;
  justify-self: start;
  margin-top: 4px;
}

.about-archive-timeline,
.about-archive-list,
.about-archive-index {
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-archive-timeline li {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 18px;
  margin: 0;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.about-archive-timeline li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.about-archive-timeline > li > span {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-4);
}

.about-archive-timeline h4,
.about-archive-list h4 {
  margin: 0 0 6px;
  font-size: 16px;
}

.about-archive-timeline p,
.about-archive-list p,
.about-archive-note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-3);
}

.about-archive-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.about-archive-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.about-archive-list li > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.about-archive-list li > div > span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-4);
  text-align: right;
}

.about-archive-list a {
  color: var(--text);
  border-bottom: 1px solid rgba(255, 255, 255, 0.34);
}

/* 该面板仅约 0.84fr 宽，两列瓦片每格不足 160px；5 项单列排布更从容，也不留半行空格。 */
.about-archive-index {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.about-archive-index li {
  padding: 16px 16px 15px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.015);
  font-size: 14px;
  color: var(--text-2);
}

.about-archive-note {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

/* -----------------------------------------------------------------------------
   CTA
   结尾改用与首页及其余内页相同的 .cta-band / .cta-inner 通栏
   （原先是一个内嵌方框，是本站第三种 CTA 样式）。
   -------------------------------------------------------------------------- */
.about-cta-band {
  padding-bottom: clamp(84px, 9vw, 140px);
}

/* 本页标题 20 字，比首页的 17 字长；沿用全站 h2 尺寸（40px）会在 720px 处
   折行，并在 CJK 任意字间断开（"如何推 / 进您…"）。34px 时单行放得下。
   注：.cta-inner h2 的 max-width 是 720px，此处放宽到 760px。 */
.about-cta-band h2 {
  max-width: 760px;
  font-size: clamp(24px, 2.6vw, 34px);
}

/* -----------------------------------------------------------------------------
   动效
   -------------------------------------------------------------------------- */
/* 粒子从散开位置飞入。只写 from：基础状态（无 transform）就是归位后的位置，
   所以动画被禁用时粒子依然落在正确的地方。 */
@keyframes about-star-in {
  from {
    transform: translate(var(--x), var(--y));
    opacity: 0;
  }
}

@keyframes about-dust-breathe {
  0%,
  100% {
    opacity: 0.55;
  }
  50% {
    opacity: 1;
  }
}

/* 明灭靠 opacity 本身：路径上带着 opacity 属性做基准值，这里只做呼吸 */
@keyframes about-star-live {
  0%,
  100% {
    opacity: 0.42;
  }
  50% {
    opacity: 1;
  }
}

@keyframes about-star-float {
  0%,
  100% {
    transform: translateY(-7px) rotate(-1.3deg);
  }
  50% {
    transform: translateY(7px) rotate(1.3deg);
  }
}

/* -----------------------------------------------------------------------------
   响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
  .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(330px, 0.9fr);
    gap: 36px;
  }

  .about-profile,
  .about-profile__bottom {
    grid-template-columns: minmax(0, 1fr);
  }

  .about-dossier {
    max-width: 720px;
  }

  .about-tech-map {
    grid-template-columns: minmax(0, 1fr);
    gap: 42px;
  }

  .about-tech-group {
    display: grid;
    grid-template-columns: minmax(220px, 0.62fr) minmax(0, 1.38fr);
    gap: 34px;
    align-items: start;
  }

  .about-tech-group__head {
    border-bottom: 0;
  }

  .about-team-item {
    grid-template-columns: minmax(170px, 0.7fr) minmax(0, 1.3fr);
  }

  .about-team-item__note {
    grid-column: 2;
    justify-self: start;
    text-align: left;
  }

  .about-archive-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-archive-panel:first-child {
    grid-column: 1 / -1;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .about-archive-panel:nth-child(2) {
    border-right: 1px solid var(--line);
  }
}

@media (min-width: 961px) and (max-height: 820px) {
  .about-hero {
    min-height: auto;
    padding-top: calc(var(--header-h) + 56px);
    padding-bottom: 34px;
  }

  .about-hero__grid,
  .about-hero__visual {
    min-height: 410px;
  }
}

@media (max-width: 960px) {
  .about-hero {
    min-height: auto;
  }

  .about-hero__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
    min-height: auto;
  }

  .about-hero__visual {
    min-height: 400px;
    padding: 0;
  }

  .about-system-map {
    width: min(100%, 540px);
  }

  .about-strategy-track {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding-top: 0;
  }

  .about-strategy-step {
    display: grid;
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 18px;
    padding: 0 0 32px;
  }

  .about-strategy-step:not(:last-child)::after {
    display: none;
  }

  .about-strategy-step:not(:last-child)::before {
    content: "";
    position: absolute;
    top: 54px;
    right: auto;
    bottom: -4px;
    left: 23px;
    width: 1px;
    height: auto;
    background: linear-gradient(180deg, var(--about-accent-line), rgba(207, 226, 245, 0.08));
  }

  .about-step-number {
    position: static;
    width: 46px;
    height: 46px;
    box-shadow: none;
  }

  .about-strategy-step__body {
    padding-top: 2px;
  }

  .about-strategy-step__body::before {
    display: none;
  }
}

@media (max-width: 860px) {
  .about-principle-rail {
    grid-template-columns: minmax(0, 1fr);
  }

  .about-principle {
    padding: 24px 0 28px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .about-principle:last-child {
    border-bottom: 0;
  }

  .about-principle__top {
    margin-bottom: 20px;
  }

  .about-principle p {
    max-width: 680px;
  }

  .about-tech-group {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .about-tech-group__head {
    border-bottom: 1px solid var(--line-strong);
  }

  .about-service-step__body {
    grid-template-columns: minmax(0, 1fr);
  }

  .about-service-step__body > div + div {
    border-top: 1px solid var(--line-soft);
    border-left: 0;
  }

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

  .about-archive-panel,
  .about-archive-panel:first-child,
  .about-archive-panel:nth-child(2),
  .about-archive-panel:last-child {
    grid-column: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .about-archive-panel:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 640px) {
  .about-hero {
    padding-top: calc(var(--header-h) + 44px);
  }

  .about-hero__grid {
    gap: 28px;
    min-height: auto;
  }

  .about-hero h1 {
    font-size: clamp(34px, 10vw, 46px);
  }

  .about-hero__signals {
    gap: 10px;
    margin-top: 26px;
    font-size: 11px;
  }

  .about-hero__visual {
    min-height: 300px;
    padding-top: 4px;
  }

  /* 字标是 3.4:1 的宽物体，本来就会吃满画布宽度 —— 这里不能再放大，
     否则左右两端会被 overflow:hidden 裁掉。 */
  .about-system-map {
    width: min(100%, 470px);
  }

  .about-strategy-step__gate > div {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 8px;
  }

  .about-strategy-foundation {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    margin-top: 30px;
  }

  .about-strategy-foundation__head {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .about-index-nav {
    margin-right: calc(var(--gutter) * -1);
    padding-right: var(--gutter);
  }

  .about-profile__bottom {
    gap: 38px;
    margin-top: 48px;
  }

  .about-problem-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .about-dossier__list > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .about-policy {
    padding: 22px 20px 22px 24px;
  }

  .about-service-track {
    grid-template-columns: minmax(0, 1fr);
  }

  .about-service-step__head {
    padding: 21px 20px 18px;
  }

  .about-service-step__body > div {
    padding: 18px 20px 20px;
  }

  .about-team-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 21px 0 23px;
  }

  .about-team-item__note {
    grid-column: 1;
    justify-self: start;
    text-align: left;
  }

  /* 窄屏改为单栏纵向堆叠，顺序：眉标 → 章节标记 → h2 → 说明 */
  .about-sec-head {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 0;
  }

  .about-sec-head .eyebrow,
  .about-sec-head::before,
  .about-sec-head h2,
  .about-sec-head .sec-sub {
    grid-column: 1;
    grid-row: auto;
    justify-self: start;
    margin-top: 0;
    margin-left: 0;
  }

  .about-sec-head .eyebrow {
    order: 0;
  }

  .about-sec-head::before {
    order: 1;
    display: block;
  }

  .about-sec-head h2 {
    order: 2;
    margin-top: 12px;
  }

  .about-sec-head .sec-sub {
    order: 3;
    margin-top: 4px;
  }

  .about-archive-panel {
    padding: 24px 0 26px;
  }

  .about-archive-head {
    min-height: auto;
  }

  .about-archive-timeline li {
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
    padding: 16px 0;
  }

  .about-archive-list li > div {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }

  .about-archive-list li > div > span {
    text-align: left;
  }

  .about-archive-index {
    grid-template-columns: minmax(0, 1fr);
  }

}

@media (prefers-reduced-motion: reduce) {
  .about-map__float,
  .about-map__dust path,
  .about-map__stars .star {
    animation: none;
  }

  /* 星野的基准透明度写在 opacity 属性上，关掉动画后按属性值显示 */
  .about-map__dust path {
    opacity: 0.45;
  }
}