/* ===== 品牌档案 / page-about ===== */

.page-about {
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 52px) 0 clamp(22px, 4.4vw, 44px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -8%;
  right: -16%;
  width: 64%;
  height: 88%;
  background: linear-gradient(140deg, rgba(139, 92, 246, .30), rgba(34, 211, 238, .13) 52%, rgba(139, 92, 246, 0) 78%);
  transform: skewY(-7deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(0deg, rgba(236, 235, 250, .026) 0 1px, transparent 1px 7px);
  pointer-events: none;
}

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

.page-about .crumb {
  margin: 0 0 clamp(12px, 2.2vw, 20px);
  font-size: 12px;
}

.page-about h1.display-1 {
  margin: 0 0 clamp(10px, 1.8vw, 16px);
  line-height: .98;
  letter-spacing: -.02em;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(15px, 1.85vw, 17px);
  line-height: 1.82;
  color: var(--muted);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(138px, 1fr));
  gap: 1px;
  background: var(--line);
  clip-path: var(--cut-path);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 15px 16px;
  background: var(--panel);
  min-width: 0;
}

.page-about .about-stats .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.45rem, 4.2vw, 2.05rem);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--gold);
}

.page-about .about-stats .meta {
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--dim);
}

.page-about .about-hero__rule {
  display: block;
  height: 2px;
  margin-top: clamp(24px, 4.4vw, 40px);
  background: linear-gradient(90deg, var(--cyan), var(--neon) 48%, var(--gold));
  transform: skewY(-1.8deg);
  opacity: .72;
}

/* ---------- 主布局：斜线索引 + 内容流 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(18px, 3.6vw, 30px);
  padding-bottom: clamp(30px, 6vw, 64px);
  align-items: start;
}

.page-about .about-timeline {
  padding: 16px 14px;
  background: var(--panel-2);
  clip-path: var(--cut-path);
}

.page-about .anchor-index__title {
  margin: 0;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--dim);
  text-transform: uppercase;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 0 20px;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--neon) 55%, var(--gold));
  transform: skewX(-9deg);
  transform-origin: top;
  opacity: .8;
}

.page-about .about-timeline__list li {
  position: relative;
}

.page-about .about-timeline__list li::before {
  content: "";
  position: absolute;
  left: -19px;
  top: 12px;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
  transition: background .25s, border-color .25s;
}

.page-about .about-timeline__list li:hover::before {
  background: var(--neon);
  border-color: var(--neon);
}

.page-about .anchor-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color .22s, background .22s;
}

.page-about .anchor-link .index-no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .anchor-link:hover,
.page-about .anchor-link[aria-current="page"] {
  color: var(--text);
  background: rgba(139, 92, 246, .14);
}

.page-about .anchor-link[aria-current="page"] .index-no {
  color: var(--gold);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: clamp(22px, 3.6vw, 34px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .section-head {
  margin-bottom: clamp(10px, 1.8vw, 16px);
}

.page-about .about-sec h2 {
  margin: 8px 0 0;
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--text);
}

.page-about .about-sec p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: clamp(15px, 1.7vw, 16.5px);
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .about-sec strong {
  color: var(--text);
  font-weight: 700;
}

/* ---------- 筛选 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
  padding: 0;
}

.page-about .filter-btn {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1;
  padding: 8px 15px;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: color .22s, border-color .22s, background .22s;
}

.page-about .filter-btn:hover {
  color: var(--text);
  border-color: var(--neon);
}

.page-about .filter-btn.is-active,
.page-about .filter-btn[aria-pressed="true"] {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
  font-weight: 700;
}

/* ---------- 主题簇卡片 ---------- */
.page-about .cluster-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .cluster-card {
  position: relative;
  min-width: 0;
  padding: 18px 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut-path);
  transition: background .28s, border-color .28s, box-shadow .28s;
}

.page-about .cluster-card::after {
  content: "";
  position: absolute;
  left: 16px;
  top: 0;
  width: 38px;
  height: 2px;
  background: var(--cyan);
  transition: background .28s;
}

.page-about .cluster-card:hover {
  background: #1C1645;
  border-color: var(--neon);
  box-shadow: var(--glow);
}

.page-about .cluster-card:hover::after {
  background: var(--gold);
}

.page-about .cluster-card .index-no {
  display: block;
  margin: 2px 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .cluster-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .cluster-card p {
  margin: 0 0 10px;
  max-width: none;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .cluster-card .meta {
  display: block;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--dim);
}

.page-about .cluster-card.is-out {
  display: none;
}

/* ---------- 媒体帧 ---------- */
.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel-2);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

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

.page-about .media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(139, 92, 246, .20), rgba(11, 10, 20, 0) 42%, rgba(34, 211, 238, .10));
  mix-blend-mode: screen;
}

.page-about .media-frame__cap {
  margin: 10px 0 0;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--dim);
}

.page-about .cluster-visual {
  display: block;
  margin: 20px 0 0;
}

/* ---------- 图文错位双栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 18px;
  min-width: 0;
  margin-top: 4px;
}

.page-about .about-split__media,
.page-about .about-split__body {
  min-width: 0;
}

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

/* ---------- 编辑流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 20px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  clip-path: var(--cut-path);
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 3px 14px;
  align-items: baseline;
  padding: 13px 16px;
  background: var(--panel-2);
  min-width: 0;
}

.page-about .about-steps .index-no {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-steps h4 {
  grid-column: 2;
  grid-row: 1;
  margin: 0 0 3px;
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-steps p {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: none;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  list-style: none;
  margin: 18px 0 18px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .cadence__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  align-items: center;
  min-width: 0;
  padding: 16px 18px;
  background: var(--panel);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .cadence__row--hot {
  border-left-color: var(--rose);
  background: linear-gradient(118deg, rgba(240, 64, 122, .16), var(--panel) 48%);
}

.page-about .cadence__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.1rem, 7vw, 3rem);
  line-height: .9;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--gold);
  text-align: center;
  min-width: 2.4ch;
}

.page-about .cadence__row--hot .cadence__num {
  color: var(--rose);
}

.page-about .cadence__unit {
  margin-left: 3px;
  font-family: var(--font-body);
  font-size: .38em;
  font-weight: 500;
  color: var(--muted);
}

.page-about .cadence__label {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .cadence__row--hot .cadence__label {
  color: var(--rose);
}

.page-about .cadence__desc {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: none;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 术语面板 ---------- */
.page-about .glossary-panel {
  margin-top: 16px;
  padding: 18px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  clip-path: var(--cut-path);
}

.page-about .glossary-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .glossary-panel li {
  position: relative;
  padding-left: 16px;
}

.page-about .glossary-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .glossary-panel p {
  margin: 0;
  max-width: none;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 继续浏览 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__link {
  display: block;
  min-width: 0;
  padding: 15px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: background .26s, border-color .26s, box-shadow .26s;
}

.page-about .about-next__link:hover {
  background: #1C1645;
  border-color: var(--neon);
  box-shadow: var(--glow);
}

.page-about .about-next__link .index-no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-next__label {
  display: block;
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 800;
}

.page-about .about-next__desc {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

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

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: clamp(22px, 4vw, 46px);
    align-items: start;
  }
  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 208px) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 68px);
  }
  .page-about .about-timeline {
    position: sticky;
    top: calc(var(--header-h) + 18px);
    padding: 18px 16px;
    background: transparent;
    clip-path: none;
  }
}

@media (min-width: 1080px) {
  .page-about .cluster-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-next {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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