.page-about {
  --about-body-text: rgba(244, 247, 244, 0.78);
  --about-gap: clamp(20px, 3vw, 32px);
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(20px, 3vw, 32px) 0 clamp(36px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(201, 255, 51, 0.10) 0%, rgba(201, 255, 51, 0) 46%),
    repeating-linear-gradient(90deg, rgba(60, 74, 68, 0.35) 0 1px, transparent 1px 104px);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
}

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

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(22px, 3vw, 36px);
}

@media (min-width: 940px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }
}

.page-about .about-hero-lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.2vw, 60px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 17ch;
}

.page-about .about-hero-text {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-body-text);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero-stats > div {
  background: var(--panel);
  padding: 16px 18px;
}

.page-about .about-hero-stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-hero-stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.page-about .about-hero-stats dd span {
  margin-left: 5px;
  font-family: var(--font-body);
  font-size: 0.34em;
  letter-spacing: 0;
  color: var(--grey);
  white-space: nowrap;
}

/* ---------- 版式骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  padding: clamp(32px, 5vw, 64px) 0 clamp(48px, 7vw, 100px);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(176px, 214px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }
}

/* ---------- 左侧索引 ---------- */
.page-about .about-rail-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--grey);
}

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

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

.page-about .about-rail-list li {
  flex: 0 0 auto;
}

.page-about .about-rail-list a {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 14px;
  color: var(--grey);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  color: var(--ink);
  border-color: var(--glass-line);
}

.page-about .about-rail-list a[aria-current="true"] {
  color: var(--accent);
  border-color: var(--glass-line);
  background: var(--glass);
}

.page-about .about-rail-list .index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: inherit;
  opacity: 0.85;
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail-list li {
    flex: initial;
  }

  .page-about .about-rail-list a {
    position: relative;
    border: 0;
    border-radius: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 12px 8px 12px 18px;
    white-space: normal;
    line-height: 1.35;
    background: none;
    transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail-list a::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 22px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--line);
    transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
  }

  .page-about .about-rail-list a:hover {
    color: var(--ink);
    background: rgba(201, 255, 51, 0.03);
  }

  .page-about .about-rail-list a[aria-current="true"] {
    color: var(--accent);
    background: var(--glass);
    border-left-color: var(--accent);
  }

  .page-about .about-rail-list a[aria-current="true"]::before {
    background: var(--accent);
    box-shadow: 0 0 0 4px rgba(201, 255, 51, 0.16);
  }
}

.page-about .about-rail-meta {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-rail-meta-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-rail-meta-time {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.page-about .about-rail-meta-note {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: clamp(28px, 4vw, 48px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 110px;
}

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

.page-about .about-section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-section-head .index-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 1px solid var(--glass-line);
  border-radius: 999px;
  padding: 4px 10px;
}

.page-about .about-section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-section-body {
  display: grid;
  gap: 18px;
  max-width: 72ch;
}

.page-about .about-section-body > * {
  margin: 0;
}

.page-about .about-section-body p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-body-text);
}

/* 引用块 */
.page-about .about-quote {
  margin-top: 6px;
  padding: 6px 0 6px 20px;
  border-left: 3px solid var(--accent);
}

.page-about .about-quote p {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-quote cite {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  font-style: normal;
  color: var(--grey);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-role {
  background: var(--panel);
  padding: 22px 20px;
  outline: none;
  transition: background 0.24s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-visible {
  background: var(--layer);
}

.page-about .about-role:focus-visible {
  box-shadow: inset 0 0 0 2px var(--accent);
}

.page-about .about-role-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 48px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.page-about .about-role h3 {
  margin: 12px 0 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-role-line {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--grey);
}

.page-about .about-role-more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.65;
  color: var(--about-body-text);
  transition: max-height 0.32s var(--ease), opacity 0.32s var(--ease), margin-top 0.32s var(--ease);
}

.page-about .about-role:hover .about-role-more,
.page-about .about-role:focus-visible .about-role-more {
  max-height: 180px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 数据来源 ---------- */
.page-about .about-source-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 780px) {
  .page-about .about-source-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-source-card {
  padding: 22px 20px;
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(201, 255, 51, 0.07), rgba(201, 255, 51, 0) 58%),
    var(--panel);
}

.page-about .about-source-num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.2vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.page-about .about-source-num span {
  margin-left: 4px;
  font-size: 0.4em;
  color: var(--grey);
}

.page-about .about-source-label {
  margin: 10px 0 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-source-text {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--grey);
}

/* ---------- 生产流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 820px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-flow-item {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(22, 38, 31, 0.92), rgba(18, 26, 23, 0.92));
  overflow: hidden;
}

.page-about .about-flow-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 42px;
  height: 3px;
  background: var(--accent);
}

.page-about .about-flow-time {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.page-about .about-flow-item h3 {
  margin: 12px 0 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-flow-item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-body-text);
}

/* ---------- 本地覆盖：比例条 ---------- */
.page-about .about-meter {
  margin: 2px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-meter-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 18px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-meter-label {
  font-size: 14px;
  color: var(--about-body-text);
}

.page-about .about-meter-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-meter-bar {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  border-radius: 999px;
  background: var(--layer);
  overflow: hidden;
}

.page-about .about-meter-bar i {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(201, 255, 51, 0.45), var(--accent));
}

/* ---------- 版本演进 ---------- */
.page-about .about-version-grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 900px) {
  .page-about .about-version-grid {
    grid-template-columns: minmax(0, 1fr) minmax(200px, 300px);
    align-items: start;
  }
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(201, 255, 51, 0.10);
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.page-about .about-tl-body h3 {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-tl-body p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-body-text);
  max-width: 60ch;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 4px 0 0;
}

.page-about .about-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  object-fit: cover;
}

.page-about .media-frame--tall img {
  aspect-ratio: 5 / 7;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 60px);
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(201, 255, 51, 0.13), rgba(201, 255, 51, 0) 58%),
    var(--panel);
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 780px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-body-text);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 进入动效 ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

.js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
  transition-delay: calc(var(--i, 0) * 120ms);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

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

.page-about {
  --i: 0.3s;
  --w: 1rem;
}