/* ============================================================
   page-about · 品牌与理念
   编年式阅读：阶段刻度纵贯，三拨人与三段路各自成章
   ============================================================ */

.page-about {
  --about-cut: 28px;
  --about-rail: 3.25rem;
}

.page-about .num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

/* ---------------- 面包屑 ---------------- */
.page-about .breadcrumbs {
  margin-bottom: 1.25rem;
  font-size: 0.8125rem;
  color: var(--muted-400);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .breadcrumbs li + li::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--line-600);
}

.page-about .breadcrumbs a {
  color: var(--muted-400);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumbs a:hover {
  color: var(--cyan-200);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--paper-100);
}

/* ---------------- 页头 ---------------- */
.page-about .about-hero {
  position: relative;
  padding-block: 2.25rem 3rem;
  overflow: hidden;
  background:
    radial-gradient(90% 70% at 88% 4%, rgba(56, 245, 208, 0.12), transparent 62%),
    radial-gradient(70% 60% at 2% 98%, rgba(255, 138, 61, 0.07), transparent 60%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-hero__title {
  margin: 0.5rem 0 1rem;
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 7.6vw, 3.4rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  font-weight: 300;
  color: var(--cyan-400);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 0 0 1.5rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--paper-100);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  background: var(--ink-700);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--about-cut)),
    calc(100% - var(--about-cut)) 100%,
    0 100%
  );
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: brightness(0.72) saturate(0.9);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(155deg, rgba(56, 245, 208, 0.22), rgba(6, 19, 15, 0.5) 66%);
  pointer-events: none;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-block: 3rem 4rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    align-items: center;
    gap: 3rem;
  }
}

/* ---------------- 通用区块与标题 ---------------- */
.page-about .about-block {
  position: relative;
  padding-block: clamp(2.5rem, 7vw, 4.5rem);
}

.page-about .about-head {
  max-width: 64ch;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-head h2 {
  margin: 0.5rem 0 0.7rem;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 5.6vw, 2.2rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-about .about-head h2 span {
  font-weight: 300;
  color: var(--cyan-400);
}

.page-about .about-head p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted-400);
}

/* ---------------- 三句理念 ---------------- */
.page-about .creed-list {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .creed {
  display: grid;
  gap: 0.5rem;
  padding: 1.25rem 1.5rem 1.25rem 1.25rem;
  background: var(--ink-700);
  border-left: 3px solid var(--cyan-400);
  clip-path: polygon(
    0 0,
    calc(100% - var(--about-cut)) 0,
    100% var(--about-cut),
    100% 100%,
    0 100%
  );
}

.page-about .creed--warm {
  border-left-color: var(--orange-500);
}

.page-about .creed__index {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--cyan-400);
}

.page-about .creed--warm .creed__index {
  color: var(--orange-500);
}

.page-about .creed__main h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-head);
  font-size: 1.3125rem;
  font-weight: 900;
  line-height: 1.2;
  color: var(--paper-100);
}

.page-about .creed__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--muted-400);
}

.page-about .creed__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 0.375rem;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--cyan-200);
  white-space: nowrap;
}

.page-about .creed--warm .creed__stat {
  color: var(--orange-200);
}

.page-about .creed__stat b {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cyan-400);
}

.page-about .creed--warm .creed__stat b {
  color: var(--orange-500);
}

@media (min-width: 860px) {
  .page-about .creed-list {
    gap: 1.125rem;
  }

  .page-about .creed {
    grid-template-columns: 3.5rem minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem 2.25rem 1.5rem 1.75rem;
  }

  .page-about .creed__stat {
    justify-self: end;
  }
}

/* ---------------- 44 人怎么分工 ---------------- */
.page-about .team-grid {
  display: grid;
  gap: 2rem;
}

.page-about .team-ring {
  display: grid;
  justify-items: center;
  gap: 1rem;
  margin: 0;
}

.page-about .team-ring svg {
  display: block;
  width: min(250px, 64vw);
  height: auto;
  overflow: visible;
}

.page-about .team-ring figcaption {
  max-width: 30ch;
  font-size: 0.8125rem;
  line-height: 1.72;
  text-align: center;
  color: var(--muted-400);
}

.page-about .team-list {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-item {
  display: grid;
  grid-template-columns: 4.25rem minmax(0, 1fr);
  align-items: baseline;
  gap: 0.3rem 1rem;
  padding-block: 1.125rem;
  border-bottom: 1px solid var(--line-600);
}

.page-about .team-item:first-child {
  border-top: 1px solid var(--line-600);
}

.page-about .team-item__num {
  grid-row: 1 / 3;
  align-self: start;
  font-size: clamp(1.75rem, 7vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .team-item__name {
  margin: 0;
  align-self: end;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 900;
  letter-spacing: -0.005em;
  color: var(--paper-100);
}

.page-about .team-item__desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.72;
  color: var(--muted-400);
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    align-items: start;
    gap: 3rem;
  }

  .page-about .team-ring {
    position: sticky;
    top: 2rem;
  }
}

/* ---------------- 更新节奏 ---------------- */
.page-about .update-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .update-media {
  position: relative;
  margin: 0;
  background: var(--ink-700);
  clip-path: polygon(
    0 0,
    100% 0,
    100% 100%,
    var(--about-cut) 100%,
    0 calc(100% - var(--about-cut))
  );
}

.page-about .update-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  filter: brightness(0.78) saturate(0.85);
}

.page-about .update-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(20deg, rgba(56, 245, 208, 0.18), rgba(6, 19, 15, 0.4) 70%);
  pointer-events: none;
}

.page-about .update-list {
  display: grid;
  gap: 0.875rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .update-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 0.3rem 1rem;
  padding: 1rem 1.125rem 1.125rem;
  background: var(--ink-700);
  border-top: 2px solid var(--line-600);
  transition: border-top-color 0.25s var(--ease);
}

.page-about .update-item:hover {
  border-top-color: var(--cyan-400);
}

.page-about .update-item__label {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 900;
  color: var(--paper-100);
}

.page-about .update-item__value {
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
  color: var(--cyan-400);
}

.page-about .update-item__note {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.72;
  color: var(--muted-400);
}

@media (min-width: 900px) {
  .page-about .update-grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
    align-items: start;
    gap: 2.5rem;
  }
}

/* ---------------- 三个阶段 ---------------- */
.page-about .phase-track {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .phase {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: 0 1.25rem;
}

.page-about .phase__rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.page-about .phase__dot {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--line-600);
  border-radius: 50%;
  background: var(--ink-800);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted-400);
  transition:
    background 0.4s var(--ease),
    border-color 0.4s var(--ease),
    color 0.4s var(--ease),
    box-shadow 0.4s var(--ease);
}

.page-about .phase__line {
  flex: 1 1 auto;
  width: 1px;
  min-height: 3rem;
  background: linear-gradient(180deg, var(--line-600), rgba(30, 74, 60, 0));
}

.page-about .phase:last-child .phase__line {
  display: none;
}

.page-about .phase.is-visible .phase__dot {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--ink-900);
  box-shadow: 0 0 0 6px rgba(56, 245, 208, 0.12);
}

.page-about .phase__body {
  padding-bottom: 2.5rem;
}

.page-about .phase:last-child .phase__body {
  padding-bottom: 0;
}

.page-about .phase__title {
  margin: 0.35rem 0 0.5rem;
  font-family: var(--font-head);
  font-size: clamp(1.25rem, 4.4vw, 1.6rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-about .phase__text {
  max-width: 56ch;
  margin: 0 0 0.75rem;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--muted-400);
}

.page-about .phase__meta {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  font-family: var(--font-num);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--cyan-200);
  background: rgba(56, 245, 208, 0.1);
  border-left: 2px solid var(--cyan-400);
}

@media (min-width: 720px) {
  .page-about {
    --about-rail: 4.5rem;
  }

  .page-about .phase {
    gap: 0 2rem;
  }

  .page-about .phase__dot {
    width: 3rem;
    height: 3rem;
    font-size: 0.8125rem;
  }

  .page-about .phase__body {
    padding-bottom: 3.25rem;
  }
}

/* ---------------- 合作生态 ---------------- */
.page-about .partner-grid {
  display: grid;
  gap: 2rem;
}

.page-about .partner-list {
  display: grid;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .partner-item {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  align-items: baseline;
  gap: 0.25rem 1rem;
  padding-bottom: 1.125rem;
  border-bottom: 1px solid var(--line-600);
}

.page-about .partner-item__num {
  grid-row: 1 / 3;
  align-self: start;
  font-size: clamp(1.75rem, 6.5vw, 2.125rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .partner-item__name {
  margin: 0;
  align-self: end;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 900;
  color: var(--paper-100);
}

.page-about .partner-item__desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.72;
  color: var(--muted-400);
}

.page-about .partner-map {
  position: relative;
  margin: 0;
  background: var(--ink-800);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--about-cut)),
    calc(100% - var(--about-cut)) 100%,
    0 100%
  );
}

.page-about .partner-map img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: brightness(0.7) saturate(0.8);
}

.page-about .partner-map::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(56, 245, 208, 0.18), rgba(6, 19, 15, 0.55) 62%);
  pointer-events: none;
}

.page-about .partner-map figcaption {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  right: 1rem;
  z-index: 1;
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cyan-200);
}

@media (min-width: 900px) {
  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
    align-items: center;
    gap: 3rem;
  }

  .page-about .partner-map figcaption {
    left: 1.5rem;
    bottom: 1.5rem;
  }
}

/* ---------------- 联系与参与 ---------------- */
.page-about .about-talk {
  padding-bottom: clamp(3rem, 8vw, 5rem);
}

.page-about .talk-grid {
  display: grid;
  gap: 1rem;
}

.page-about .talk-card {
  display: grid;
  align-content: start;
  gap: 0.6rem;
  padding: 1.5rem 1.5rem 1.5rem 1.375rem;
  background: var(--ink-800);
  border-top: 2px solid var(--line-600);
  transition:
    border-top-color 0.25s var(--ease),
    background 0.25s var(--ease);
}

.page-about .talk-card:hover,
.page-about .talk-card:focus-within {
  background: var(--ink-700);
  border-top-color: var(--cyan-400);
}

.page-about .talk-card--warm:hover,
.page-about .talk-card--warm:focus-within {
  border-top-color: var(--orange-500);
}

.page-about .talk-card__tag {
  font-family: var(--font-num);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--cyan-400);
}

.page-about .talk-card--warm .talk-card__tag {
  color: var(--orange-500);
}

.page-about .talk-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 900;
  line-height: 1.32;
  color: var(--paper-100);
}

.page-about .talk-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted-400);
}

.page-about .talk-card .btn {
  justify-self: start;
  margin-top: 0.35rem;
}

@media (min-width: 800px) {
  .page-about .talk-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

/* ---------------- 动效退让 ---------------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}
<<<END>>>