.page-about {
  --about-cut: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  --about-cut-sm: polygon(0 0, calc(100% - 11px) 0, 100% 11px, 100% 100%, 11px 100%, 0 calc(100% - 11px));
  --about-index-w: 168px;
  color: var(--text);
  padding-bottom: 88px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.page-about .crumb {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease);
}
.page-about .crumb:hover {
  border-bottom-color: var(--ice);
}
.page-about .crumb--current {
  color: var(--muted);
}
.page-about .crumb-sep {
  color: var(--line-strong);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 26px 46px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(15, 43, 58, 0.6), rgba(6, 10, 24, 0) 72%),
    repeating-linear-gradient(90deg, rgba(140, 153, 184, 0.07) 0 1px, transparent 1px 58px),
    repeating-linear-gradient(0deg, rgba(140, 153, 184, 0.05) 0 1px, transparent 1px 58px);
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .about-hero__lead {
  padding-top: 6px;
}
.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-size: clamp(28px, 6.4vw, 50px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.01em;
  max-width: 20em;
}
.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  opacity: 0.86;
}
.page-about .about-hero__lead .cta-row {
  margin-top: 22px;
}

.page-about .about-hero__stat {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px 18px 22px;
  background: var(--panel);
  border-top: 3px solid var(--lime);
  clip-path: var(--about-cut-sm);
}
.page-about .about-hero__stat--ice {
  background: var(--panel-2);
  border-top-color: var(--ice);
}
.page-about .about-hero__stat-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}
.page-about .about-hero__stat-value {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(46px, 12vw, 72px);
  line-height: 0.92;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.02em;
}
.page-about .about-hero__stat--ice .about-hero__stat-value {
  color: var(--ice);
}
.page-about .about-hero__stat-unit {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--text);
  opacity: 0.8;
}
.page-about .about-hero__stat .note {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--muted);
}

/* 入口带 */
.page-about .about-strip {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-strip__item {
  background: var(--ink);
}
.page-about .about-strip__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}
.page-about .about-strip__link:hover {
  background: var(--panel-2);
  color: var(--lime);
}
.page-about .about-strip__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ice);
}
.page-about .about-strip__link:hover .about-strip__idx {
  color: var(--lime);
}

/* ---------- 主体网格：索引 + 内容 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  padding-top: 46px;
}

.page-about .about-side {
  border-left: 1px solid var(--line);
  padding-left: 16px;
}
.page-about .about-side__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}
.page-about .about-side__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-side__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.page-about .about-side__list a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-about .about-side__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ice);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: 96px;
  margin-bottom: 68px;
}
.page-about .about-sec:last-child {
  margin-bottom: 0;
}
.page-about .about-sec__head {
  margin-bottom: 24px;
}
.page-about .about-sec__head h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 4.2vw, 34px);
  line-height: 1.26;
  font-weight: 900;
  letter-spacing: -0.005em;
}
.page-about .about-sec__intro {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
  opacity: 0.84;
}

/* 主内容 + 旁注 */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.page-about .about-note {
  padding: 15px 16px 17px;
  background: rgba(111, 227, 208, 0.06);
  border-top: 2px solid var(--ice);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-note__k {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ice);
}

/* ---------- 四条内容线 ---------- */
.page-about .line-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .line-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 18px 18px 20px;
  background: var(--panel);
  border-left: 3px solid var(--line-strong);
  clip-path: var(--about-cut-sm);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .line-item:hover {
  background: var(--panel-2);
  border-left-color: var(--lime);
}
.page-about .line-item__num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.15;
  color: var(--ice);
}
.page-about .line-item__body h3 {
  margin: 0 0 7px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}
.page-about .line-item__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 图片容器 ---------- */
.page-about .media {
  margin: 26px 0 0;
}
.page-about .media__frame {
  position: relative;
  background: var(--panel);
  clip-path: var(--about-cut);
  overflow: hidden;
}
.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.page-about .media--net {
  margin-top: 22px;
}

/* ---------- 案例合集研究板 ---------- */
.page-about .case-board {
  display: grid;
  gap: 20px;
}
.page-about .case-sum {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .case-sum__cell {
  padding: 14px 14px 16px;
  background: var(--panel-2);
  clip-path: var(--about-cut-sm);
}
.page-about .case-sum__cell--alt {
  background: var(--indigo);
}
.page-about .case-sum__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.02em;
}
.page-about .case-sum__cell--alt .case-sum__v {
  color: var(--pulse);
}
.page-about .case-sum__unit {
  margin-left: 3px;
  font-size: 13px;
  letter-spacing: 0.04em;
}
.page-about .case-sum__k {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .case-board .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.page-about .case-board .tab {
  padding: 9px 16px;
  font-family: inherit;
  font-size: 14px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  clip-path: var(--about-cut-sm);
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.page-about .case-board .tab:hover {
  color: var(--text);
  border-color: var(--ice);
}
.page-about .case-board .tab[aria-selected="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 700;
}
.page-about .case-board .tab:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 2px;
}
.page-about .case-board .tabs__panel {
  margin-top: 18px;
  padding: 22px 20px 24px;
  background: var(--indigo);
  clip-path: var(--about-cut);
}
.page-about .case-board .tabs__panel[hidden] {
  display: none;
}
.page-about .case-board .tabs__panel h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
}
.page-about .case-board .tabs__panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
  opacity: 0.86;
}
.page-about .case-points {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .case-points li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .case-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--ice);
  transform: rotate(45deg);
}

.page-about .case-exit {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.page-about .case-exit__txt {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 流程步骤 ---------- */
.page-about .flow {
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .flow__step {
  position: relative;
}
.page-about .flow__step + .flow__step::before {
  content: "";
  position: absolute;
  left: 30px;
  top: -11px;
  width: 1px;
  height: 11px;
  background: var(--line-strong);
}
.page-about .flow__step details {
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--about-cut-sm);
  transition: border-color 0.2s var(--ease);
}
.page-about .flow__step details[open] {
  border-color: rgba(198, 242, 78, 0.45);
}
.page-about .flow__step summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}
.page-about .flow__step summary::-webkit-details-marker {
  display: none;
}
.page-about .flow__num {
  flex: none;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--lime);
  border: 1px solid rgba(198, 242, 78, 0.5);
  clip-path: var(--about-cut-sm);
}
.page-about .flow__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}
.page-about .flow__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.page-about .flow__body {
  margin: 0;
  padding: 0 18px 18px 62px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 14px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}
.page-about .team-figures__item {
  padding: 14px 0 0;
  border-top: 2px solid var(--ice);
}
.page-about .team-figures__v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 42px);
  line-height: 1;
  color: var(--ice);
  letter-spacing: 0.02em;
}
.page-about .team-figures__plus {
  font-size: 0.5em;
  margin-left: 2px;
}
.page-about .team-figures__k {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}
.page-about .about-body-txt {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
  opacity: 0.86;
}

/* ---------- 发展节奏 ---------- */
.page-about .stage {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .stage__item {
  position: relative;
  padding: 0 0 26px 30px;
  margin-left: 8px;
  border-left: 1px solid var(--line-strong);
}
.page-about .stage__item:last-child {
  padding-bottom: 0;
}
.page-about .stage__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--ice);
  transform: rotate(45deg);
}
.page-about .stage__item--current::before {
  background: var(--pulse);
  box-shadow: 0 0 0 4px rgba(255, 90, 43, 0.16);
}
.page-about .stage__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}
.page-about .stage__item--current .stage__title {
  color: var(--pulse);
}
.page-about .stage__txt {
  margin: 0;
  max-width: 38em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 服务与备案 ---------- */
.page-about .service-panel {
  padding: 30px 22px 34px;
  background: linear-gradient(140deg, var(--wine) 0%, var(--indigo) 68%, var(--panel) 100%);
  clip-path: var(--about-cut);
}
.page-about .eyebrow--onwine {
  color: rgba(233, 238, 247, 0.72);
}
.page-about .service-panel h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 4.2vw, 32px);
  line-height: 1.26;
  font-weight: 900;
}
.page-about .service-lede {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
  opacity: 0.9;
}
.page-about .service-lede--tight {
  margin-top: 20px;
}
.page-about .service-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 24px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid rgba(233, 238, 247, 0.22);
}
.page-about .service-facts__row dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: rgba(233, 238, 247, 0.7);
}
.page-about .service-facts__row dd {
  margin: 7px 0 0;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--text);
}
.page-about .service-panel .cta-row {
  margin-top: 26px;
}

/* ---------- 平板 ---------- */
@media (min-width: 760px) {
  .page-about .about-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .case-sum {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .service-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .service-panel {
    padding: 36px 34px 40px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.72fr) minmax(0, 0.62fr) minmax(0, 0.62fr);
    align-items: stretch;
    gap: 18px;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 246px;
    gap: 36px;
    align-items: start;
  }
  .page-about .about-split--flip {
    grid-template-columns: 246px minmax(0, 1fr);
  }
  .page-about .case-board {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: 52px;
    padding-top: 56px;
  }
  .page-about .about-side {
    position: sticky;
    top: 84px;
  }
  .page-about .about-side__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }
  .page-about .about-side__list a {
    border-bottom: 1px solid var(--line);
  }
  .page-about .about-side__list a:hover {
    border-bottom-color: var(--lime);
  }
}

@media (min-width: 1280px) {
  .page-about .about-sec {
    margin-bottom: 78px;
  }
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 16px;
  }
  .page-about .flow__step + .flow__step::before {
    display: none;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .line-item,
  .page-about .tab,
  .page-about .about-strip__link,
  .page-about .about-side__list a {
    transition: none;
  }
}
</final>
</final>