/* ============ 品牌主张页 · page-about ============ */

.page-about {
  --about-rail: 48px;
  --about-line: rgba(23, 48, 79, .85);
  --about-line-soft: rgba(23, 48, 79, .55);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(112px, 20vh, 196px) 0 clamp(44px, 7vw, 76px);
  overflow: hidden;
  background:
    radial-gradient(110% 70% at 4% 0%, rgba(53, 242, 216, .10), transparent 58%),
    radial-gradient(85% 60% at 100% 92%, rgba(255, 138, 61, .08), transparent 62%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
  margin-top: 22px;
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(34px, 7.8vw, 82px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--paper);
  max-width: 15ch;
}

.page-about .about-hero h1 em {
  font-style: normal;
  font-weight: 800;
  color: var(--cyan);
}

.page-about .about-hero .lede {
  margin-top: 22px;
  max-width: 42ch;
  color: var(--grey);
}

/* 右侧事实栏 */
.page-about .hero-facts {
  margin: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .hero-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .hero-fact dt {
  color: var(--index);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .hero-fact dd {
  margin: 0;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  text-align: right;
  word-break: break-word;
}

/* ---------- 章节索引浮层 ---------- */
.page-about .chapter-index {
  display: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(52px, 9vw, 104px) 0;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--about-line);
}

.page-about .about-block {
  display: grid;
  gap: 16px;
}

.page-about .chapter-mark {
  margin: 0;
  color: var(--index);
  font-size: 12px;
  letter-spacing: .12em;
  line-height: 1;
}

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

.page-about .about-body .section-head__title {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(26px, 4.6vw, 46px);
  line-height: 1.2;
  letter-spacing: -.005em;
  color: var(--paper);
  margin: 0;
}

.page-about .about-body .lede {
  margin-top: 14px;
  max-width: 46ch;
  color: var(--grey);
}

.page-about .prose {
  margin-top: 22px;
}

.page-about .prose p {
  max-width: 64ch;
  color: var(--paper);
  line-height: 1.85;
  margin: 0 0 1.1em;
}

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

/* ---------- 01 主张来源 ---------- */
.page-about .origin-notes {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .origin-note {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .origin-note:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .origin-note .mono {
  color: var(--amber);
  font-size: 12px;
  letter-spacing: .14em;
}

.page-about .origin-note p {
  margin: 0;
  color: var(--grey);
  line-height: 1.8;
  max-width: 58ch;
}

/* ---------- 02 团队 ---------- */
.page-about .team-layout {
  margin-top: 28px;
  display: grid;
  gap: 20px;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-boards {
  display: grid;
  gap: 14px;
}

.page-about .team-board {
  padding: 24px 22px 26px;
  border: 1px solid var(--track);
  background: linear-gradient(160deg, rgba(14, 29, 53, .95), rgba(8, 18, 38, .7));
}

.page-about .team-board--a {
  border-radius: 6px 26px 8px 22px;
  background: linear-gradient(160deg, rgba(30, 58, 92, .72), rgba(14, 29, 53, .9));
}

.page-about .team-board--b {
  border-radius: 22px 6px 22px 6px;
}

.page-about .team-board--c {
  border-radius: 8px 30px 8px 30px;
  background: linear-gradient(160deg, rgba(23, 48, 79, .8), rgba(8, 18, 38, .85));
}

.page-about .board-tag {
  margin: 0;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: .14em;
}

.page-about .team-board h3 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .team-board p:not(.board-tag) {
  margin: 12px 0 0;
  color: var(--grey);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .team-rhythm {
  margin: 26px 0 0;
  padding-left: 18px;
  border-left: 1px solid var(--cyan);
  color: var(--grey);
  font-size: 15px;
  line-height: 1.85;
  max-width: 62ch;
}

/* ---------- 03 版本阶段 ---------- */
.page-about .phase-figure {
  margin: 30px 0 0;
}

.page-about .phase-timeline {
  margin-top: 30px;
}

.page-about .phase-list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .phase-item {
  position: relative;
  flex: 0 0 78%;
  min-width: 236px;
  scroll-snap-align: start;
}

.page-about .phase {
  height: 100%;
  border: 1px solid var(--track);
  border-radius: var(--radius-soft);
  background: linear-gradient(170deg, rgba(14, 29, 53, .95), rgba(8, 18, 38, .72));
  overflow: hidden;
  transition: border-color .22s var(--ease);
}

.page-about .phase[open] {
  border-color: rgba(53, 242, 216, .45);
}

.page-about .phase-head {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 18px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .phase-head::-webkit-details-marker {
  display: none;
}

.page-about .phase-tag {
  flex: none;
  display: inline-grid;
  place-items: center;
  min-width: 44px;
  padding: 4px 8px;
  border-radius: var(--radius-chip);
  background: rgba(53, 242, 216, .12);
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: .12em;
}

.page-about .phase-name {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(16px, 2.3vw, 19px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .phase-caret {
  flex: none;
  position: relative;
  width: 14px;
  height: 14px;
}

.page-about .phase-caret::before,
.page-about .phase-caret::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--grey);
  transform: translate(-50%, -50%);
  transition: transform .2s var(--ease), background .2s var(--ease);
}

.page-about .phase-caret::before {
  width: 12px;
  height: 1px;
}

.page-about .phase-caret::after {
  width: 1px;
  height: 12px;
}

.page-about .phase[open] .phase-caret::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-about .phase[open] .phase-caret::before {
  background: var(--cyan);
}

.page-about .phase-body {
  padding: 0 18px 20px;
}

.page-about .phase-body p {
  margin: 0;
  color: var(--grey);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .phase-points {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .phase-points li {
  position: relative;
  padding-left: 18px;
  color: var(--paper);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .phase-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
}

.page-about .phase-foot {
  margin: 24px 0 0;
  color: var(--grey);
  font-size: 15px;
  line-height: 1.85;
  max-width: 62ch;
}

/* ---------- 04 备案与核查 ---------- */
.page-about .review-layout {
  margin-top: 28px;
  display: grid;
  gap: 30px;
}

.page-about .review-main {
  min-width: 0;
}

.page-about .review-main .prose {
  margin-top: 0;
}

.page-about .check-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .check-step {
  position: relative;
  padding: 0 0 26px 38px;
}

.page-about .check-step:last-child {
  padding-bottom: 0;
}

.page-about .check-step::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 30px;
  bottom: 0;
  border-left: 1px dashed var(--about-line-soft);
}

.page-about .check-step:last-child::before {
  display: none;
}

.page-about .check-step__num {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .06em;
  z-index: 1;
}

.page-about .check-step__title {
  margin: 2px 0 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .check-step p {
  margin: 8px 0 0;
  color: var(--grey);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .review-rhythm {
  margin: 26px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--about-line);
  color: var(--grey);
  font-size: 15px;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .review-figure {
  margin: 0;
}

/* ---------- 05 判断标准 ---------- */
.page-about .standard-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .standard-item {
  display: grid;
  gap: 8px;
  padding: 24px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .standard-item:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .standard-value {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--amber);
}

.page-about .standard-item h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .standard-item p:not(.standard-value) {
  margin: 0;
  color: var(--grey);
  font-size: 15px;
  line-height: 1.85;
  max-width: 58ch;
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: 38px;
  padding: 28px 24px 30px;
  border: 1px solid var(--track);
  border-radius: 8px 30px 8px 30px;
  background:
    radial-gradient(120% 130% at 0% 0%, rgba(53, 242, 216, .10), transparent 60%),
    linear-gradient(160deg, rgba(14, 29, 53, .9), rgba(8, 18, 38, .75));
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  color: var(--paper);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .cta-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .team-boards {
    grid-template-columns: 1.3fr .85fr;
  }

  .page-about .team-board--c {
    grid-column: 1 / -1;
  }

  .page-about .origin-note {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .standard-item {
    grid-template-columns: 190px minmax(0, 1fr);
    column-gap: 34px;
    align-items: start;
  }

  .page-about .standard-value {
    grid-row: 1 / span 2;
  }

  .page-about .check-steps {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    margin-top: 30px;
  }

  .page-about .check-steps::before {
    content: "";
    position: absolute;
    left: 14px;
    right: 14px;
    top: 14px;
    border-top: 1px dashed var(--about-line-soft);
    z-index: 0;
  }

  .page-about .check-step {
    padding: 0;
  }

  .page-about .check-step::before {
    display: none;
  }

  .page-about .check-step__num {
    position: relative;
    left: auto;
    top: auto;
    margin-bottom: 14px;
    z-index: 1;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(240px, .75fr);
    gap: 60px;
    align-items: end;
  }

  .page-about .about-block {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 40px;
  }

  .page-about .chapter-mark {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    padding-top: 10px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .team-boards {
    grid-template-columns: 1.25fr .9fr;
  }

  .page-about .phase-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    overflow: visible;
    padding-left: 36px;
    position: relative;
  }

  .page-about .phase-list::before {
    content: "";
    position: absolute;
    left: 11px;
    top: 26px;
    bottom: 26px;
    width: 1px;
    background: linear-gradient(180deg, var(--cyan) 0%, rgba(53, 242, 216, .35) 48%, rgba(23, 48, 79, .9) 100%);
  }

  .page-about .phase-item {
    flex: none;
    min-width: 0;
  }

  .page-about .phase-item::before {
    content: "";
    position: absolute;
    left: -29px;
    top: 26px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: 1px solid var(--cyan);
    background: var(--ink);
    z-index: 1;
    transition: background .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
  }

  .page-about .phase-item:has(.phase[open])::before {
    background: var(--amber);
    border-color: var(--amber);
    box-shadow: 0 0 0 4px rgba(255, 138, 61, .18);
  }

  .page-about .review-layout {
    grid-template-columns: minmax(0, 1fr) 292px;
    gap: 46px;
    align-items: start;
  }

  .page-about .about-cta {
    padding: 34px 36px 36px;
  }
}

/* ---------- 章节索引浮层（桌面） ---------- */
@media (min-width: 1024px) {
  .page-about .chapter-index {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: fixed;
    right: 16px;
    top: calc(var(--header-h) + 20px);
    z-index: 25;
    padding: 9px;
    border: 1px solid var(--about-line);
    border-radius: var(--radius-chip);
    background: rgba(8, 18, 38, .76);
    backdrop-filter: blur(10px);
  }

  .page-about .chapter-link {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 32px;
    padding: 0 9px;
    border-radius: 9px;
    color: var(--index);
    font-size: 12px;
    line-height: 1;
    text-decoration: none;
    transition: color .2s var(--ease), background .2s var(--ease);
  }

  .page-about .chapter-link .mono {
    color: inherit;
    font-size: 11px;
    letter-spacing: .08em;
  }

  .page-about .chapter-link:hover,
  .page-about .chapter-link.is-current,
  .page-about .chapter-link[aria-current="true"] {
    color: var(--cyan);
    background: rgba(53, 242, 216, .09);
  }
}

@media (min-width: 1320px) {
  .page-about .chapter-link {
    font-size: 13px;
  }
}

/* ---------- 图片容器 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure__media {
  overflow: hidden;
  border-radius: 6px 26px 8px 22px;
  border: 1px solid var(--track);
  background: var(--night);
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) brightness(.86) contrast(1.06);
}

.page-about .figure__caption {
  margin-top: 12px;
  color: var(--index);
  font-size: 13px;
  line-height: 1.7;
}

.page-about .figure--tall .figure__media img {
  aspect-ratio: 3 / 4;
}

@media (min-width: 900px) {
  .page-about .figure--wide .figure__media img {
    aspect-ratio: 16 / 9;
  }
}
<<<END>>>