.page-about {
  --about-rail: 224px;
  --about-col-gap: clamp(28px, 4vw, 68px);
  --about-block: clamp(32px, 5vw, 60px);
  --about-panel: rgba(19, 26, 58, 0.68);
  --about-panel-line: rgba(124, 77, 255, 0.18);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(88px, 14vw, 128px) 0 clamp(36px, 6vw, 64px);
}

.page-about .about-hero-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(124, 77, 255, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 77, 255, 0.13) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 78% at 68% 6%, #000 0%, transparent 74%);
  mask-image: radial-gradient(120% 78% at 68% 6%, #000 0%, transparent 74%);
}

.page-about .about-hero-inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: center;
  margin-top: clamp(18px, 3vw, 32px);
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-about .about-kicker-code {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--pill);
  background: rgba(0, 230, 118, 0.12);
  border: 1px solid rgba(0, 230, 118, 0.42);
  color: var(--green);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.page-about h1 {
  margin: 0 0 20px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero-lede {
  margin: 0 0 28px;
  max-width: 60ch;
  font-size: clamp(15px, 1.15vw, 18px);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero-visual {
  max-width: 320px;
  margin-inline: auto;
  width: 100%;
}

.page-about .about-orb {
  display: block;
  width: 100%;
  height: auto;
  animation: about-orb-breathe 12s ease-in-out infinite;
}

@keyframes about-orb-breathe {
  0%, 100% { transform: scale(1); opacity: 0.92; }
  50% { transform: scale(1.035); opacity: 1; }
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(34px, 6vw, 56px) 0 0;
  padding: clamp(20px, 3vw, 28px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat .stat-value {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  letter-spacing: -0.02em;
}

.page-about .about-stat .stat-label {
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-col-gap);
  padding-bottom: clamp(56px, 9vw, 108px);
}

.page-about .about-rail-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.page-about .about-directory .directory-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px;
}

.page-about .about-directory .directory-link {
  display: block;
  padding: 9px 14px;
  border-radius: var(--pill);
  border: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-directory .directory-link:hover,
.page-about .about-directory .directory-link:focus-visible {
  color: var(--white);
  border-color: rgba(0, 230, 118, 0.45);
}

.page-about .about-directory .directory-link[aria-current="true"] {
  color: var(--ink-900);
  background: var(--green);
  border-color: var(--green);
  font-weight: 600;
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(30px, 5vw, 52px);
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  padding-top: var(--about-block);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 110px;
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 130px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--green), rgba(124, 77, 255, 0) 100%);
  transform: skewX(-32deg);
}

.page-about .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter:first-child::before {
  display: none;
}

.page-about .about-chapter-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 12px;
}

.page-about .about-chapter .chapter-number {
  flex: none;
  font-size: clamp(30px, 5vw, 54px);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: rgba(0, 230, 118, 0.12);
  -webkit-text-stroke: 1.3px rgba(0, 230, 118, 0.8);
}

.page-about .about-chapter .chapter-title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-chapter .chapter-lede {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 62ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.8;
  color: rgba(0, 230, 118, 0.86);
  font-weight: 500;
}

.page-about .about-prose p {
  margin: 0 0 1.05em;
  max-width: 66ch;
  font-size: clamp(15px, 1.02vw, 17px);
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .about-annotation {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--text-dim);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--about-panel-line);
  background: var(--about-panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

.page-about .about-figure .media-caption {
  display: block;
  margin: 0;
  padding: 12px 20px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 维度筛选 ---------- */
.page-about .about-facets {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 数据卡片 ---------- */
.page-about .about-dims {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-dim {
  padding: clamp(20px, 2.6vw, 28px);
  border-radius: var(--radius-md);
  background: var(--about-panel);
  border: 1px solid var(--about-panel-line);
}

.page-about .about-dim .card-title {
  margin: 14px 0 10px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-dim .card-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-role {
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--violet);
  background: rgba(59, 46, 140, 0.16);
}

.page-about .about-role:nth-child(2) {
  border-left-color: var(--green);
  background: rgba(11, 61, 46, 0.28);
}

.page-about .about-role:nth-child(3) {
  border-left-color: var(--amber);
  background: rgba(255, 109, 0, 0.1);
}

.page-about .about-role:nth-child(4) {
  border-left-color: var(--wine);
  background: rgba(122, 31, 61, 0.18);
}

.page-about .about-role-title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-roles-note {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--green), var(--violet) 42%, var(--wine) 72%, var(--amber));
  opacity: 0.7;
}

.page-about .tl-item {
  position: relative;
  padding-left: 40px;
}

.page-about .tl-node {
  position: absolute;
  left: 2px;
  top: 28px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--green);
  box-shadow: 0 0 0 4px rgba(0, 230, 118, 0.12);
}

.page-about .tl-card {
  padding: clamp(18px, 2.4vw, 26px);
  border-radius: var(--radius-md);
  background: var(--about-panel);
  border: 1px solid var(--about-panel-line);
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.page-about .tl-card:hover,
.page-about .tl-card:focus-within,
.page-about .tl-card:focus {
  transform: translateY(-4px);
  border-color: rgba(0, 230, 118, 0.5);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  outline: none;
}

.page-about .tl-era {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-about .tl-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .tl-extra {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(124, 77, 255, 0.35);
}

.page-about .tl-extra p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--green-soft);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: clamp(10px, 2vw, 18px);
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 140% at 90% 10%, rgba(124, 77, 255, 0.3), transparent 62%),
    linear-gradient(135deg, var(--green-deep), var(--ink-800));
  border: 1px solid rgba(0, 230, 118, 0.28);
}

.page-about .about-cta-title {
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-cta-text {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-hero-visual {
    max-width: 460px;
  }
}

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

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-directory .directory-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .page-about .about-directory .directory-link {
    padding: 10px 0 10px 16px;
    border: 0;
    border-left: 2px solid var(--line-soft);
    border-radius: 0;
  }

  .page-about .about-directory .directory-link[aria-current="true"] {
    background: transparent;
    color: var(--green);
    border-left-color: var(--green);
    border-radius: 0;
  }

  .page-about .about-chapter {
    padding-right: 64px;
  }

  .page-about .about-annotation {
    position: absolute;
    top: var(--about-block);
    right: 4px;
    margin: 0;
    writing-mode: vertical-rl;
    letter-spacing: 0.34em;
  }

  .page-about .about-chapter:first-child .about-annotation {
    top: 0;
  }
}

@media (min-width: 1100px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .tl-extra {
    display: grid;
    grid-template-rows: 0fr;
    opacity: 0;
    padding-top: 0;
    border-top-width: 0;
    transition: grid-template-rows 0.45s var(--ease), opacity 0.45s var(--ease), padding-top 0.45s var(--ease);
  }

  .page-about .tl-extra > p {
    overflow: hidden;
  }

  .page-about .tl-card:hover .tl-extra,
  .page-about .tl-card:focus-within .tl-extra,
  .page-about .tl-card:focus .tl-extra {
    grid-template-rows: 1fr;
    opacity: 1;
    padding-top: 10px;
    border-top-width: 1px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-orb {
    animation: none;
  }

  .page-about .tl-card {
    transition: border-color 0.3s var(--ease);
  }
}