.page-about {
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  scroll-behavior: smooth;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 58px) 0 clamp(30px, 5vw, 64px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -14%;
  width: min(620px, 62vw);
  height: 140%;
  background: linear-gradient(125deg, rgba(240, 68, 30, 0.16), rgba(255, 122, 47, 0.12) 42%, rgba(47, 230, 166, 0.1) 66%, transparent 82%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 30px);
  font-size: var(--fs-12);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.6vw, 3.75rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 17em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.1875rem);
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.page-about .about-hero__meta li {
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: #fff;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.page-about .about-hero__meta li:first-child {
  border-color: transparent;
  background: linear-gradient(120deg, var(--red), var(--red-hi));
  color: #fff;
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 48px);
  padding-bottom: clamp(56px, 8vw, 108px);
}

.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: clamp(52px, 7vw, 92px);
  min-width: 0;
}

/* ---------- 左侧索引 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: #fff;
  color: var(--text);
  font-size: var(--fs-15);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--red);
  border-color: var(--red);
  transform: translateY(-2px);
}

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

/* ---------- 栏目标题组 ---------- */
.page-about .about-section {
  scroll-margin-top: 104px;
}

.page-about .about-section .section-head {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .section-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--red);
}

.page-about .section-head__eyebrow::before {
  content: "";
  width: 24px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--red), var(--red-hi));
  transform: skewX(-26deg);
}

.page-about .section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.375rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 22em;
}

/* ---------- 通用正文 ---------- */
.page-about .about-text p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: var(--fs-19);
  line-height: 1.75;
}

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

.page-about .about-text--wide {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 68ch;
  font-size: var(--fs-19);
  line-height: 1.75;
}

/* ---------- 起点 ---------- */
.page-about .about-split {
  display: grid;
  gap: 20px;
}

.page-about .about-note {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3vw, 30px);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--paper);
  box-shadow: var(--shadow-card);
}

.page-about .about-note::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -42%;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(47, 230, 166, 0.38), transparent 68%);
  pointer-events: none;
}

.page-about .about-note__label {
  position: relative;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .about-note__text {
  position: relative;
  margin: 0 0 20px;
  font-size: var(--fs-19);
  line-height: 1.75;
  color: rgba(243, 245, 248, 0.9);
}

.page-about .about-note__foot {
  position: relative;
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid rgba(47, 230, 166, 0.5);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--signal);
}

/* ---------- 整理三步 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: clamp(18px, 3vw, 28px);
  background: #fff;
  transition: background 0.2s ease;
}

.page-about .about-step:hover {
  background: linear-gradient(90deg, rgba(240, 68, 30, 0.05), transparent 42%);
}

.page-about .about-step__num {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: var(--r-sm);
  background: linear-gradient(135deg, rgba(240, 68, 30, 0.16), rgba(255, 122, 47, 0.24));
  color: var(--red);
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.page-about .about-step__body h3 {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-24);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 66ch;
  font-size: var(--fs-15);
  line-height: 1.75;
}

/* ---------- 媒体容器 ---------- */
.page-about .about-media {
  margin: 0 0 clamp(22px, 3vw, 34px);
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(150deg, var(--ink), var(--ink-2));
  box-shadow: var(--shadow-card);
}

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

.page-about .about-media--panel {
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 分工泳道 ---------- */
.page-about .about-lanes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-lane {
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--red);
  border-radius: var(--r-md);
  background: #fff;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-lane:nth-child(2) {
  border-top-color: var(--ink-2);
}

.page-about .about-lane:nth-child(3) {
  border-top-color: var(--signal-deep);
}

.page-about .about-lane:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

.page-about .about-lane__meta {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-lane__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--fs-19);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-lane p:last-child {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.75;
}

/* ---------- 覆盖数据面板 ---------- */
.page-about .about-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3vw, 34px);
  border-radius: var(--r-md);
  background: linear-gradient(145deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--paper);
  box-shadow: var(--shadow-card);
}

.page-about .about-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto auto;
  width: 46%;
  height: 100%;
  background: linear-gradient(115deg, transparent 40%, rgba(255, 122, 47, 0.16));
  clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-panel .data-panel__head {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .about-panel .data-panel__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-19);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .about-panel .data-panel__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: rgba(243, 245, 248, 0.6);
}

.page-about .about-panel__grid {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .about-panel .stat {
  padding-left: 13px;
  border-left: 2px solid rgba(47, 230, 166, 0.5);
}

.page-about .about-panel .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.2vw, 1.375rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .about-panel .stat__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-12);
  line-height: 1.65;
  color: rgba(243, 245, 248, 0.76);
}

/* ---------- 协作生态 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-partner {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  background: #fff;
}

.page-about .about-partner::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(20px, 3vw, 28px);
  bottom: clamp(20px, 3vw, 28px);
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--red), var(--red-hi));
}

.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--fs-19);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-partner p {
  margin: 0;
  max-width: 64ch;
  font-size: var(--fs-15);
  line-height: 1.75;
}

/* ---------- 时间轴 ---------- */
.page-about .about-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--red), var(--red-hi) 24%, var(--signal) 64%, rgba(201, 209, 219, 0) 100%);
  opacity: 0.6;
}

.page-about .about-milestone {
  position: relative;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.page-about .about-milestone__marker {
  position: relative;
  z-index: 1;
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--line);
  background: var(--ink);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.page-about .about-milestone__body {
  padding: 18px 20px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-milestone:hover .about-milestone__body {
  transform: translateX(4px);
  border-color: rgba(240, 68, 30, 0.5);
  box-shadow: var(--shadow-card);
}

.page-about .about-milestone__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-19);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-milestone__body p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-15);
  line-height: 1.75;
}

/* ---------- 继续查看 ---------- */
.page-about .about-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 54px 22px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  color: var(--text);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(240, 68, 30, 0.55);
  box-shadow: var(--shadow-card);
}

.page-about .about-link__title {
  font-family: var(--font-display);
  font-size: var(--fs-19);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-link__desc {
  font-size: var(--fs-15);
  line-height: 1.7;
}

.page-about .about-link__arrow {
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: var(--fs-19);
  color: var(--red);
  transition: transform 0.2s ease;
}

.page-about .about-link:hover .about-link__arrow,
.page-about .about-link:focus-visible .about-link__arrow {
  transform: translate(4px, -50%);
}

/* ---------- 桌面断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-split {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 32px;
    align-items: start;
  }

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

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

  .page-about .about-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: clamp(44px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 2px solid var(--line);
  }

  .page-about .about-rail__link {
    justify-content: flex-start;
    margin-left: -2px;
    padding: 8px 4px 8px 16px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    font-size: var(--fs-15);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--red);
    background: linear-gradient(90deg, rgba(240, 68, 30, 0.08), transparent 70%);
    transform: none;
  }

  .page-about .about-panel__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-lane,
  .page-about .about-link,
  .page-about .about-link__arrow,
  .page-about .about-milestone__body,
  .page-about .about-rail__link,
  .page-about .about-step {
    transition: none;
  }

  .page-about .about-lane:hover,
  .page-about .about-link:hover,
  .page-about .about-link:focus-visible,
  .page-about .about-milestone:hover .about-milestone__body {
    transform: none;
  }
}
<<<END>>>