.page-about {
  --about-gap: 1.5rem;
}

.page-about .yw-breadcrumb {
  margin-top: 1.75rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 2.5rem 0 3.5rem;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -30% auto -30%;
  height: 78%;
  background:
    radial-gradient(52% 58% at 22% 30%, rgba(29, 229, 255, 0.16), transparent 68%),
    radial-gradient(46% 52% at 82% 6%, rgba(138, 92, 255, 0.18), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}

.page-about .about-hero__lead {
  display: grid;
  gap: 1.1rem;
  align-content: start;
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(2.05rem, 7vw, 4.6rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--yw-text);
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 36rem;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--yw-muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.4rem;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--yw-line);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--yw-cyan), var(--yw-violet) 48%, var(--yw-magenta));
  opacity: 0.85;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-top: 1px solid var(--yw-line);
  border-bottom: 1px solid var(--yw-line);
  background:
    linear-gradient(90deg, rgba(29, 229, 255, 0.07), rgba(138, 92, 255, 0.06) 58%, rgba(255, 46, 136, 0.04));
}

.page-about .about-index__list {
  display: flex;
  gap: 1.4rem;
  margin: 0;
  padding: 0.85rem 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__list a {
  display: inline-block;
  white-space: nowrap;
  padding-bottom: 0.25rem;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--yw-muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.3s var(--yw-ease), border-color 0.3s var(--yw-ease);
}

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

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  margin-bottom: 2rem;
}

.page-about .about-head h2 {
  margin: 0.4rem 0 0;
  font-size: clamp(1.55rem, 4.6vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--yw-text);
}

/* ---------- 为谁做什么 ---------- */
.page-about .about-who {
  padding: 3.75rem 0 3rem;
}

.page-about .about-who__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-who__prose p {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--yw-muted);
}

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

.page-about .about-outs {
  display: grid;
  gap: 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-out {
  position: relative;
  padding: 1.4rem 1.4rem 1.45rem 1.6rem;
  background: linear-gradient(140deg, rgba(16, 26, 49, 0.92), rgba(11, 17, 32, 0.94));
  box-shadow: inset 0 0 0 1px var(--yw-line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition: box-shadow 0.35s var(--yw-ease), transform 0.35s var(--yw-ease);
}

.page-about .about-out:hover {
  box-shadow: inset 0 0 0 1px var(--yw-gold);
  transform: translateY(-3px);
}

.page-about .about-out__no {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--yw-cyan);
  margin-bottom: 0.55rem;
}

.page-about .about-out h3 {
  margin: 0 0 0.5rem;
  font-size: 1.08rem;
  color: var(--yw-text);
}

.page-about .about-out p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--yw-muted);
}

/* ---------- 产品线整合 ---------- */
.page-about .about-integration {
  padding: 1rem 0 3rem;
}

.page-about .about-integration__panel {
  position: relative;
  display: grid;
  gap: 1.75rem;
  padding: 2rem 1.5rem 2.2rem;
  overflow: hidden;
}

.page-about .about-integration__panel::before {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -55%;
  width: 62%;
  height: 300px;
  background: radial-gradient(closest-side, rgba(255, 46, 136, 0.24), transparent 72%);
  pointer-events: none;
}

.page-about .about-integration__copy {
  position: relative;
  display: grid;
  gap: 0.9rem;
}

.page-about .about-integration__copy h2 {
  margin: 0;
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  line-height: 1.24;
  color: var(--yw-text);
}

.page-about .about-integration__copy p {
  margin: 0;
  max-width: 38rem;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--yw-muted);
}

.page-about .about-facts {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  margin: 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--yw-line);
}

.page-about .about-fact dt {
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--yw-muted);
}

.page-about .about-fact dd {
  margin: 0.3rem 0 0;
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--yw-cyan);
}

/* ---------- 三个阶段 ---------- */
.page-about .about-phases-wrap {
  padding: 3rem 0;
}

.page-about .about-phases__visual {
  position: relative;
  margin: 0 0 2.75rem;
  border: 1px solid var(--yw-line);
}

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

.page-about .about-phases {
  display: grid;
  gap: 2.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-phase {
  position: relative;
  padding-left: 2.1rem;
}

.page-about .about-phase::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: -2.5rem;
  width: 1px;
  background: linear-gradient(to bottom, var(--yw-violet), rgba(42, 58, 92, 0.35));
}

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

.page-about .about-phase__node {
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--yw-ink);
  box-shadow: inset 0 0 0 2px var(--yw-violet);
  transition: box-shadow 0.4s var(--yw-ease), background 0.4s var(--yw-ease);
}

.page-about .about-phase[data-active="true"] .about-phase__node {
  background: var(--yw-gold);
  box-shadow: inset 0 0 0 2px var(--yw-gold), 0 0 16px rgba(245, 192, 74, 0.65);
}

.page-about .about-phase__body {
  display: grid;
  gap: 0.7rem;
}

.page-about .about-phase__no {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--yw-violet);
}

.page-about .about-phase[data-active="true"] .about-phase__no {
  color: var(--yw-gold);
}

.page-about .about-phase__body h3 {
  margin: 0;
  font-size: 1.28rem;
  color: var(--yw-text);
}

.page-about .about-phase__body > p {
  margin: 0;
  max-width: 36rem;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--yw-muted);
}

.page-about .about-phase__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.45rem;
}

.page-about .about-phase__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--yw-text);
}

.page-about .about-phase__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 6px;
  background: var(--yw-cyan);
  transform: skewX(-20deg);
}

/* ---------- 内容团队 ---------- */
.page-about .about-team {
  padding: 3rem 0;
}

.page-about .about-team__visual {
  position: relative;
  margin: 0 0 1.75rem;
  border: 1px solid var(--yw-line);
}

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

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

.page-about .about-role {
  position: relative;
  padding: 1.5rem 1.3rem 1.75rem;
  background: var(--yw-ink);
  transition: background 0.35s var(--yw-ease);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 2px;
  background: var(--yw-cyan);
  transition: width 0.35s var(--yw-ease), background 0.35s var(--yw-ease);
}

.page-about .about-role:hover {
  background: var(--yw-card);
}

.page-about .about-role:hover::before {
  width: 100%;
  background: var(--yw-gold);
}

.page-about .about-role__tag {
  display: block;
  margin-bottom: 0.85rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--yw-violet);
}

.page-about .about-role h3 {
  margin: 0 0 0.55rem;
  font-size: 1.05rem;
  color: var(--yw-text);
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--yw-muted);
}

/* ---------- 协作生态 ---------- */
.page-about .about-eco {
  padding: 3rem 0;
}

.page-about .about-eco__inner {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-eco__lead {
  display: grid;
  gap: 0.9rem;
  align-content: start;
}

.page-about .about-eco__lead h2 {
  margin: 0;
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  line-height: 1.24;
  color: var(--yw-text);
}

.page-about .about-eco__lead p {
  margin: 0;
  max-width: 34rem;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--yw-muted);
}

.page-about .about-eco__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco__item {
  display: grid;
  gap: 0.45rem;
  padding: 1.35rem 1rem 1.35rem 1.15rem;
  border-top: 1px solid var(--yw-line);
  border-left: 2px solid transparent;
  transition: border-color 0.35s var(--yw-ease), background 0.35s var(--yw-ease);
}

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

.page-about .about-eco__item:hover {
  border-left-color: var(--yw-cyan);
  background: linear-gradient(90deg, rgba(29, 229, 255, 0.07), transparent 72%);
}

.page-about .about-eco__item h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--yw-text);
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--yw-muted);
}

/* ---------- 长期承诺 ---------- */
.page-about .about-promise {
  padding: 3rem 0 4.25rem;
}

.page-about .about-promise__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-promise__item {
  padding: 1.5rem 1.35rem 1.6rem;
  background: var(--yw-card);
  border-top: 2px solid var(--yw-violet);
}

.page-about .about-promise__item h3 {
  margin: 0 0 0.6rem;
  font-size: 1.08rem;
  color: var(--yw-text);
}

.page-about .about-promise__item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--yw-muted);
}

.page-about .about-promise__next {
  display: grid;
  gap: 1.25rem;
  margin-top: 0.35rem;
  padding: 1.6rem 1.4rem 1.7rem;
  border: 1px solid var(--yw-line);
  background:
    linear-gradient(118deg, rgba(138, 92, 255, 0.16), rgba(29, 229, 255, 0.06) 58%, transparent 88%);
}

.page-about .about-promise__next h3 {
  margin: 0 0 0.6rem;
  font-size: 1.2rem;
  color: var(--yw-text);
}

.page-about .about-promise__next p {
  margin: 0;
  max-width: 44rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--yw-muted);
}

.page-about .about-promise__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

/* ---------- 桌面端栅格 ---------- */
@media (min-width: 760px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-promise__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-promise__next {
    grid-column: 1 / -1;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 4rem 0 5rem;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 3.5rem;
    align-items: end;
  }

  .page-about .about-hero__intro {
    font-size: 1.05rem;
  }

  .page-about .about-integration__panel {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    gap: 2.5rem;
    padding: 2.75rem 2.5rem 2.9rem;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding-top: 1.6rem;
  }

  .page-about .about-phase {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 72px minmax(0, 1fr);
    align-items: start;
    padding-left: 0;
  }

  .page-about .about-phase::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-phase__node {
    position: static;
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    margin-top: 8px;
  }

  .page-about .about-phase__body {
    grid-column: 1;
    grid-row: 1;
    padding-right: 1.75rem;
  }

  .page-about .about-phase:nth-child(even) .about-phase__body {
    grid-column: 3;
    padding-right: 0;
    padding-left: 1.75rem;
  }

  .page-about .about-phase:nth-child(even) .about-phase__body > p {
    max-width: 32rem;
  }

  .page-about .about-eco__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3rem;
  }
}

@media (min-width: 1060px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-who {
    padding: 5rem 0 3.5rem;
  }

  .page-about .about-who__grid {
    gap: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-out,
  .page-about .about-role,
  .page-about .about-role::before,
  .page-about .about-eco__item,
  .page-about .about-phase__node {
    transition: none;
  }

  .page-about .about-out:hover {
    transform: none;
  }
}