.page-about {
  background: var(--c-void);
  color: var(--c-text);
  display: block;
}

/* ---------- 面包屑间距 ---------- */
.page-about .breadcrumbs {
  padding: clamp(20px, 3vw, 32px) 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 6vw, 76px);
  border-bottom: 1px solid var(--c-steel);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(36, 69, 95, .34) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 69, 95, .34) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(ellipse 130% 95% at 18% 0%, #000 0%, transparent 74%);
  mask-image: radial-gradient(ellipse 130% 95% at 18% 0%, #000 0%, transparent 74%);
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  width: min(560px, 78vw);
  aspect-ratio: 1;
  right: -18%;
  top: -38%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(47, 217, 192, .17), transparent 68%);
}

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

.page-about .about-masthead__kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-copper-lit);
  border: 1px solid var(--c-copper);
  padding: 5px 12px;
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-masthead__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.6vw, 78px);
  line-height: 1.0;
  letter-spacing: -.02em;
  color: var(--c-title);
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 17ch;
}

.page-about .about-masthead__lead {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(16px, 1.7vw, 20px);
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 62ch;
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.page-about .about-masthead__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--c-steel);
}

.page-about .about-masthead__fact {
  flex: 1 1 150px;
  padding: 14px 20px 14px 0;
  border-right: 1px solid rgba(36, 69, 95, .6);
}

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

.page-about .about-masthead__fact dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-mist);
  margin: 0 0 6px;
}

.page-about .about-masthead__fact dd {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  color: var(--c-cyan);
}

/* ---------- 卷首语纸块 ---------- */
.page-about .about-preamble {
  padding: clamp(36px, 6vw, 72px) 0;
}

.page-about .about-preamble__paper {
  position: relative;
  background: var(--c-paper);
  color: var(--c-ink);
  border: 1px solid var(--c-copper);
  padding: clamp(28px, 5vw, 56px) clamp(22px, 4vw, 56px);
  max-width: 900px;
  box-shadow: 6px 6px 0 rgba(185, 115, 58, .28);
}

.page-about .about-preamble__mark {
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--c-copper);
  margin: 0 0 clamp(16px, 2vw, 24px);
}

.page-about .about-preamble__line {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 40px);
  line-height: 1.24;
  letter-spacing: -.01em;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}

.page-about .about-preamble__note {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: #3b4b58;
  margin: 0;
  max-width: 56ch;
}

/* ---------- 页边章节索引 ---------- */
.page-about .about-rail {
  display: none;
}

@media (min-width: 1440px) {
  .page-about .about-rail {
    display: block;
    position: fixed;
    left: max(16px, calc((100vw - var(--shell-max)) / 2 - 108px));
    top: 50%;
    transform: translateY(-50%);
    z-index: 4;
    width: 88px;
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    gap: 8px;
    text-decoration: none;
    color: var(--c-mist);
    font-size: 11px;
    line-height: 1.3;
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
    border-left: 1px solid transparent;
    padding-left: 8px;
  }

  .page-about .about-rail__link .mono {
    font-size: 11px;
    color: var(--c-copper);
    letter-spacing: .06em;
  }

  .page-about .about-rail__name {
    display: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--c-copper-lit);
    border-left-color: var(--c-copper);
    outline: none;
  }
}

@media (min-width: 1660px) {
  .page-about .about-rail {
    width: 124px;
  }

  .page-about .about-rail__name {
    display: inline;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(40px, 6vw, 80px) 0;
}

.page-about .about-chapter .chapter-head {
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-chapter .chapter-head__index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-copper);
  border: 1px solid var(--c-copper);
  padding: 2px 8px;
  letter-spacing: .1em;
}

.page-about .about-chapter .chapter-head__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.28;
  color: var(--c-title);
  letter-spacing: .01em;
}

.page-about .about-chapter .chapter-head__note {
  color: var(--c-mist);
  font-size: 14px;
  max-width: 52ch;
}

.page-about .about-subhead {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--c-copper-lit);
  margin: 0 0 12px;
}

.page-about .about-inline-link {
  display: inline-block;
  color: var(--c-copper-lit);
  text-decoration: none;
  font-size: 15px;
  border-bottom: 1px solid rgba(185, 115, 58, .5);
  padding-bottom: 2px;
  position: relative;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-inline-link::after {
  content: "→";
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
  outline: none;
}

.page-about .about-chapter__link,
.page-about .about-scenes__link,
.page-about .about-exchange__link {
  margin: clamp(20px, 3vw, 28px) 0 0;
}

/* ---------- 01 品牌一章 ---------- */
.page-about .about-chapter__body {
  align-items: start;
}

.page-about .about-chapter__figure {
  margin: 0;
  border: 1px solid var(--c-steel);
}

/* ---------- 02 数据底盘 ---------- */
.page-about .about-data {
  border-top: 1px solid var(--c-copper);
  border-bottom: 1px solid var(--c-copper);
}

.page-about .about-facts {
  list-style: none;
  margin: 0 0 clamp(32px, 5vw, 56px);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--c-steel);
}

@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-fact {
  padding: 20px 20px 22px 0;
  border-bottom: 1px solid rgba(36, 69, 95, .7);
  position: relative;
  transition: background-color var(--dur) var(--ease);
}

@media (min-width: 620px) {
  .page-about .about-fact {
    padding-left: 20px;
    border-left: 1px solid rgba(36, 69, 95, .7);
  }
}

.page-about .about-fact:hover {
  background: rgba(47, 217, 192, .05);
}

.page-about .about-fact__num {
  display: block;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: -.01em;
  margin: 0 0 10px;
}

.page-about .about-fact__label {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  color: var(--c-title);
  margin: 0 0 6px;
  line-height: 1.5;
}

.page-about .about-fact__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
  margin: 0;
}

/* ---------- 03 团队 ---------- */
.page-about .about-team__photo {
  margin: 0 0 clamp(32px, 5vw, 56px);
  border: 1px solid var(--c-steel);
}

.page-about .about-team__body {
  align-items: start;
}

.page-about .about-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--c-steel);
}

.page-about .about-team-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 16px;
  align-items: center;
  padding: 15px 0 13px;
  border-bottom: 1px solid rgba(36, 69, 95, .5);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-team-row:hover {
  background: rgba(47, 217, 192, .04);
}

.page-about .about-team-row__name {
  font-size: 15px;
  color: var(--c-title);
  letter-spacing: .01em;
}

.page-about .about-team-row__num {
  font-size: 22px;
  font-weight: 700;
  color: var(--c-cyan);
  line-height: 1;
}

.page-about .about-team-row__bar {
  grid-column: 1 / -1;
  display: block;
  height: 4px;
  background: rgba(36, 69, 95, .75);
  overflow: hidden;
}

.page-about .about-team-row__bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(to right, var(--c-copper), var(--c-cyan));
}

.page-about .about-team__foot {
  margin: 22px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-mist);
  border-left: 2px solid var(--c-copper);
  padding-left: 14px;
}

/* ---------- 04 版本历程 ---------- */
.page-about .about-versions {
  border-top: 1px solid var(--c-copper);
}

.page-about .about-timeline {
  position: relative;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding-top: 8px;
}

.page-about .about-timeline__art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .08;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-timeline__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: flex;
  align-items: start;
  gap: 0;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .tl-node {
  position: relative;
  flex: 0 0 76vw;
  min-width: 0;
  scroll-snap-align: start;
  padding: 34px 22px 6px 0;
  outline: none;
}

@media (min-width: 900px) {
  .page-about .tl-node {
    flex: 1 1 0;
    padding-right: 20px;
  }
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 13px;
  height: 1px;
  background: var(--c-steel);
  transition: background-color var(--dur) var(--ease);
}

.page-about .tl-node__dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  background: var(--c-void);
  border: 1px solid var(--c-copper);
  transform: rotate(45deg);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl-node__ver {
  display: block;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-copper-lit);
  margin: 0 0 4px;
}

.page-about .tl-node__year {
  display: block;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-mist);
  margin: 0 0 12px;
}

.page-about .tl-node__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--c-title);
  margin: 0 0 8px;
}

.page-about .tl-node__sum {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
  margin: 0;
}

.page-about .tl-node__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .32s var(--ease);
}

.page-about .tl-node__panel > p {
  overflow: hidden;
  min-height: 0;
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-text);
  border-left: 1px solid var(--c-copper);
  padding-left: 0;
  opacity: 0;
  transition: opacity .22s var(--ease) .06s, padding-left .22s var(--ease);
}

.page-about .tl-node:hover .tl-node__panel,
.page-about .tl-node:focus .tl-node__panel,
.page-about .tl-node:focus-within .tl-node__panel {
  grid-template-rows: 1fr;
}

.page-about .tl-node:hover .tl-node__panel > p,
.page-about .tl-node:focus .tl-node__panel > p,
.page-about .tl-node:focus-within .tl-node__panel > p {
  opacity: 1;
  padding-left: 12px;
  padding-top: 6px;
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus::before,
.page-about .tl-node:hover .tl-node__dot,
.page-about .tl-node:focus .tl-node__dot {
  background: var(--c-copper);
  border-color: var(--c-cyan);
}

.page-about .tl-node:focus-visible {
  box-shadow: 0 0 0 2px rgba(185, 115, 58, .55);
}

.page-about .about-versions__note {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border-left: 1px solid var(--c-copper);
  padding-left: clamp(16px, 2vw, 24px);
}

/* ---------- 05 使用场景 ---------- */
.page-about .about-scenes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--c-steel);
}

@media (min-width: 860px) {
  .page-about .about-scenes {
    grid-template-columns: 4fr 5fr 3fr;
  }
}

.page-about .about-scene {
  padding: clamp(22px, 3vw, 34px) 22px clamp(26px, 3vw, 38px) 0;
  border-bottom: 1px solid rgba(36, 69, 95, .6);
  position: relative;
  transition: background-color var(--dur) var(--ease);
}

@media (min-width: 860px) {
  .page-about .about-scene {
    padding-left: 22px;
    border-left: 1px solid rgba(36, 69, 95, .6);
  }
}

.page-about .about-scene:hover {
  background: rgba(16, 42, 65, .6);
}

.page-about .about-scene__when {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-cyan);
  margin: 0 0 12px;
}

.page-about .about-scene__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.4;
  color: var(--c-title);
  margin: 0 0 12px;
}

.page-about .about-scene__text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
  margin: 0;
}

.page-about .about-scene--b {
  border-top: 2px solid var(--c-copper);
}

/* ---------- 06 交流与展示 ---------- */
.page-about .about-exchange {
  border-bottom: 1px solid var(--c-copper);
}

.page-about .about-exchange__body {
  align-items: start;
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  padding: clamp(40px, 6vw, 84px) 0;
  background:
    linear-gradient(135deg, rgba(255, 122, 61, .12), transparent 58%),
    var(--c-night);
}

.page-about .about-cta__inner {
  border: 1px solid var(--c-copper);
  padding: clamp(26px, 4vw, 52px) clamp(22px, 4vw, 56px);
  position: relative;
}

.page-about .about-cta__kicker {
  font-size: 11px;
  letter-spacing: .28em;
  color: var(--c-orange);
  margin: 0 0 16px;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--c-title);
  margin: 0 0 16px;
  max-width: 22ch;
}

.page-about .about-cta__text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-mist);
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 60ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

/* ---------- 收窄正文 ---------- */
.page-about .prose {
  max-width: 62ch;
}

.page-about .prose p {
  margin: 0 0 1.05em;
}

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

/* ---------- 图片容器微调 ---------- */
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-frame--tall img {
  aspect-ratio: 9 / 14;
}

.page-about .media-frame--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .media-frame__cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-mist);
  border-left: 1px solid var(--c-copper);
  padding-left: 10px;
}

/* ---------- 触屏与低动效 ---------- */
@media (hover: none) {
  .page-about .tl-node__panel {
    grid-template-rows: 1fr;
  }

  .page-about .tl-node__panel > p {
    opacity: 1;
    padding-left: 12px;
    padding-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 560px) {
  .page-about .about-masthead__fact {
    flex: 1 1 100%;
    border-right: 0;
    border-bottom: 1px solid rgba(36, 69, 95, .6);
    padding-right: 0;
  }

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

  .page-about .about-preamble__paper {
    box-shadow: 4px 4px 0 rgba(185, 115, 58, .28);
  }
}
<<<END>>>