/* ===== 品牌与使命 / page-about ===== */

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 20px 0 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .about-crumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-crumbs li + li::before {
  content: "/";
  color: var(--mute);
}

.page-about .about-crumbs a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s ease, border-color .25s ease;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(40px, 6vw, 80px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 34%, rgba(42, 53, 86, .25) 82%, transparent);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: end;
}

.page-about .about-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.6vw, 58px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-lede {
  margin: 0 0 clamp(22px, 4vw, 34px);
  max-width: 56ch;
  color: var(--slate);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--void);
}

.page-about .hs-num {
  font-size: clamp(22px, 3.6vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .hs-label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mute);
}

.page-about .about-hero-visual {
  position: relative;
  margin: 0;
}

.page-about .about-hero-visual::before,
.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  width: 44px;
  height: 44px;
  pointer-events: none;
  z-index: 2;
}

.page-about .about-hero-visual::before {
  top: 10px;
  left: 10px;
  border-top: 1px solid var(--cyan);
  border-left: 1px solid var(--cyan);
}

.page-about .about-hero-visual::after {
  right: 10px;
  bottom: 34px;
  border-right: 1px solid var(--cyan);
  border-bottom: 1px solid var(--cyan);
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(.92) contrast(1.06);
}

.page-about .about-hero-visual .media-caption {
  display: block;
  padding-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mute);
}

/* ---------- 章节头 ---------- */

.page-about .chapter-head {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 16px;
  align-items: start;
  padding-bottom: 20px;
  margin-bottom: clamp(26px, 4.5vw, 44px);
  border-bottom: 1px solid var(--line);
}

.page-about .chapter-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--violet);
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: .06em;
  transition: transform .45s ease, border-color .45s ease, box-shadow .45s ease;
}

.page-about [data-chapter].is-active .chapter-num {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(44, 232, 216, .28);
  transform: translateX(-4px);
}

.page-about .chapter-title {
  grid-column: 2;
  margin: 4px 0 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .chapter-sub {
  grid-column: 2;
  margin: 10px 0 0;
  max-width: 64ch;
  color: var(--slate);
  font-size: 16px;
  line-height: 1.78;
}

/* ---------- 时间线 ---------- */

.page-about .about-track {
  position: relative;
}

.page-about .about-ridge {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: clamp(90px, 16vw, 180px);
  color: var(--line);
  opacity: .6;
  pointer-events: none;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 40px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 58%, rgba(42, 53, 86, .18));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(26px, 4.5vw, 42px);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 12px;
  height: 12px;
  border: 1px solid var(--cyan);
  background: var(--void);
  transform: rotate(45deg);
  transition: background .35s ease, border-color .35s ease;
}

.page-about .tl-item:hover::before {
  background: var(--cyan);
}

.page-about .tl-mark {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--violet);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-tl-figure {
  margin: clamp(28px, 5vw, 42px) 0 0;
}

.page-about .about-tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(.85) contrast(1.05);
}

.page-about .about-tl-figure .media-caption {
  display: block;
  padding-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mute);
}

/* ---------- 奶油纸数据区 ---------- */

.page-about .about-paper {
  margin-top: clamp(26px, 4.5vw, 46px);
  padding: clamp(28px, 5vw, 56px) 0 clamp(30px, 5vw, 58px);
  background: var(--paper);
  color: var(--brown);
  border-top: 2px solid var(--cyan);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table-scroll:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .about-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .about-table caption {
  padding-bottom: 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(27, 20, 16, .62);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 13px 18px 13px 0;
  border-bottom: 1px solid rgba(27, 20, 16, .18);
  text-align: left;
  vertical-align: top;
  line-height: 1.62;
}

.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(27, 20, 16, .72);
  border-bottom: 1px solid rgba(27, 20, 16, .55);
}

.page-about .about-table tbody th {
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-table .num {
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .about-table th:first-child,
.page-about .about-table td:first-child {
  position: sticky;
  left: 0;
  background: var(--paper);
  padding-right: 16px;
}

.page-about .about-paper-note {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(27, 20, 16, .74);
}

/* ---------- 四栏目 ---------- */

.page-about .about-columns {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 3.4vw, 30px);
  background: var(--void);
  transition: background .3s ease, transform .3s ease;
}

.page-about .about-col:hover {
  background: var(--indigo);
}

.page-about .col-tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--violet);
}

.page-about .col-title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(18px, 2.5vw, 22px);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .col-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .col-facts {
  margin: auto 0 0;
  padding: 12px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .col-facts li + li {
  margin-top: 4px;
}

.page-about .col-facts .mono {
  color: var(--cyan);
}

/* ---------- 流程 ---------- */

.page-about .about-process {
  display: grid;
  gap: clamp(26px, 4.5vw, 42px);
  align-items: start;
}

.page-about .about-process-figure {
  margin: 0;
  position: relative;
}

.page-about .about-process-figure::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: calc(100% - 100%);
  width: 100%;
  height: 1px;
  background: var(--line);
}

.page-about .about-process-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(.9) contrast(1.05);
}

.page-about .about-process-figure .media-caption {
  display: block;
  padding-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mute);
}

.page-about .about-flow {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .flow-step {
  position: relative;
  padding: clamp(20px, 3.2vw, 28px);
  background: var(--indigo);
  transition: background .3s ease, transform .3s ease;
}

.page-about .flow-step:hover {
  background: #14205; 
  background: #142055;
  transform: translateY(-2px);
}

.page-about .flow-num {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .flow-title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .flow-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .flow-meta {
  margin: 14px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--violet);
}

/* ---------- 长期使用理由 ---------- */

.page-about .about-reasons {
  display: grid;
  gap: clamp(20px, 3.4vw, 34px);
}

.page-about .reason {
  position: relative;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .reason::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 42px;
  height: 1px;
  background: var(--cyan);
}

.page-about .reason-num {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--violet);
}

.page-about .reason-title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(17px, 2.3vw, 20px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .reason-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- 合作方 ---------- */

.page-about .about-partners {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .about-partner {
  display: flex;
  flex-direction: column;
  padding: clamp(20px, 3.2vw, 28px);
  background: var(--indigo);
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  transition: transform .3s ease, border-left-color .3s ease, box-shadow .3s ease;
}

.page-about .about-partner:hover,
.page-about .about-partner:focus-within {
  transform: translateY(-4px);
  border-left-color: var(--cyan);
  box-shadow: 0 14px 34px rgba(7, 14, 36, .55), 0 0 0 1px rgba(44, 232, 216, .16);
}

.page-about .p-kind {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .p-title {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 21px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .p-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .p-more {
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--violet);
  transition: max-height .35s ease, opacity .35s ease, margin-top .35s ease;
}

.page-about .about-partner:hover .p-more,
.page-about .about-partner:focus-within .p-more {
  max-height: 160px;
  margin-top: 12px;
  opacity: 1;
}

@media (hover: none) {
  .page-about .p-more {
    max-height: none;
    margin-top: 12px;
    opacity: 1;
  }
}

/* ---------- 使命收束 ---------- */

.page-about .about-mission {
  position: relative;
  margin-top: clamp(40px, 7vw, 88px);
  padding: clamp(40px, 7vw, 90px) 0 clamp(46px, 7vw, 96px);
  background: linear-gradient(180deg, var(--indigo), var(--void) 88%);
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-ridge--foot {
  top: 0;
  bottom: auto;
  height: clamp(80px, 14vw, 150px);
  color: var(--violet);
  opacity: .22;
}

.page-about .about-mission-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-mission-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-mission-title {
  margin: 0 0 18px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(26px, 5vw, 46px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-mission-text {
  margin: 0 0 clamp(24px, 4vw, 36px);
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--slate);
}

.page-about .about-mission-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-mission-actions .btn {
  text-decoration: none;
}

.page-about .about-mission-note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
}

.page-about .about-mission-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 232, 216, .45);
  transition: border-color .25s ease;
}

.page-about .about-mission-note a:hover,
.page-about .about-mission-note a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero-visual img {
    aspect-ratio: 16 / 10;
  }

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

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

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

@media (min-width: 920px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }

  .page-about .about-hero-visual img {
    aspect-ratio: 16 / 9;
  }
}

@media (min-width: 1024px) {
  .page-about .about-track {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-tl-figure {
    position: sticky;
    top: 96px;
    margin-top: 8px;
  }

  .page-about .about-process {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-process-figure {
    position: sticky;
    top: 96px;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-num,
  .page-about .tl-item::before,
  .page-about .about-partner,
  .page-about .flow-step,
  .page-about .p-more {
    transition: none;
  }

  .page-about .about-partner:hover,
  .page-about .flow-step:hover {
    transform: none;
  }
}
<<<END>>>