/* ====== 当前页面专属样式 · page-about ====== */

.page-about {
  background: var(--c-bg);
  color: var(--c-text);
  position: relative;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-top: 1.75rem;
  font-size: 0.875rem;
}

.page-about .breadcrumb__item {
  color: var(--c-muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition);
}

.page-about .breadcrumb__item:hover {
  color: var(--c-accent);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "→";
  margin-right: 0.5rem;
  color: var(--c-accent);
  opacity: 0.7;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.page-about .breadcrumb__item--current {
  color: var(--c-text-strong);
  font-weight: 600;
  cursor: default;
}

/* ---------- 页面开场：主题声明 + 内容目录 ---------- */
.page-about .about-intro {
  position: relative;
  padding: 3rem 0 3.5rem;
}

.page-about .about-intro::before {
  content: "ABOUT";
  position: absolute;
  left: -0.12em;
  bottom: 0;
  font-family: var(--font-head);
  font-size: clamp(5rem, 14vw, 11rem);
  font-weight: 700;
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1px rgba(234, 242, 248, 0.05);
  pointer-events: none;
  z-index: 0;
  white-space: nowrap;
}

.page-about .about-intro::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--c-accent) 0%, var(--c-accent-strong) 55%, var(--c-accent-2) 100%);
  opacity: 0.7;
}

.page-about .about-intro__grid {
  display: grid;
  gap: 2.5rem;
  position: relative;
  z-index: 1;
}

.page-about .about-intro__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--c-accent);
  font-size: 0.813rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.page-about .about-intro__kicker::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--c-accent-2);
  transform: rotate(45deg);
  flex: 0 0 auto;
}

.page-about .about-intro h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--c-text-strong);
  margin: 0 0 1.375rem;
  max-width: 16em;
}

.page-about .about-intro__lead {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--c-text);
  max-width: 44em;
  margin-bottom: 1.5rem;
}

.page-about .about-intro__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.page-about .about-intro__meta .tag {
  border: 1px solid var(--c-line);
  color: var(--c-muted);
  background: transparent;
  font-size: 0.813rem;
  padding: 0.375rem 0.75rem;
  transition: border-color var(--transition), color var(--transition);
}

.page-about .about-intro__meta .tag:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.page-about .about-intro__dir {
  background: rgba(18, 57, 92, 0.55);
  border-left: 3px solid var(--c-accent);
  padding: 1.5rem;
  align-self: start;
  position: relative;
  max-width: 26rem;
}

.page-about .about-intro__dir > .mono {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--c-muted);
  display: block;
  margin-bottom: 0.5rem;
}

.page-about .about-intro__dir-link {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.625rem 0;
  color: var(--c-text-strong);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line-soft);
  font-weight: 600;
  font-size: 0.938rem;
  transition: color var(--transition), padding-left var(--transition);
}

.page-about .about-intro__dir-link:first-of-type {
  border-top: 1px solid var(--c-line-soft);
}

.page-about .about-intro__dir-link:last-child {
  border-bottom: none;
}

.page-about .about-intro__dir-link span {
  font-size: 0.813rem;
  color: var(--c-accent);
  font-family: var(--font-mono);
}

.page-about .about-intro__dir-link:hover,
.page-about .about-intro__dir-link:focus-visible {
  color: var(--c-accent);
  padding-left: 0.5rem;
  outline: none;
}

.page-about .about-intro__dir-link:hover span,
.page-about .about-intro__dir-link:focus-visible span {
  color: var(--c-accent-2);
}

/* ---------- 通用栏目结构 ---------- */
.page-about .about-section {
  position: relative;
  padding: 3.5rem 0;
  border-top: 1px solid var(--c-line-soft);
}

.page-about .about-section .section-head {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-bottom: 2rem;
}

.page-about .section-head__idx {
  color: var(--c-accent);
  font-size: 0.875rem;
  line-height: 1;
}

.page-about .section-head__title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--c-text-strong);
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .section-head__line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--c-accent) 0%, transparent 100%);
  opacity: 0.5;
  margin-left: 0.5rem;
  max-width: 160px;
}

/* ---------- 关于本站 ---------- */
.page-about .about-mission {
  background: linear-gradient(180deg, transparent 0%, rgba(18, 57, 92, 0.22) 100%);
}

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

.page-about .about-mission__copy {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about .about-mission__copy p {
  line-height: 1.7;
  margin: 0;
  color: var(--c-text);
  max-width: 40em;
}

.page-about .about-mission__copy .about-mission__lead {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-text-strong);
  line-height: 1.45;
  margin-bottom: 0.5rem;
}

.page-about .about-mission__copy .btn {
  align-self: flex-start;
  margin-top: 0.75rem;
}

.page-about .about-mission__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding: 0;
  overflow: hidden;
}

.page-about .about-mission__stat {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--c-line-soft);
  background: rgba(234, 242, 248, 0.04);
  transition: background var(--transition);
}

.page-about .about-mission__stat:nth-child(even) {
  background: rgba(18, 57, 92, 0.35);
}

.page-about .about-mission__stat:last-child {
  border-bottom: none;
  background: rgba(255, 209, 102, 0.06);
}

.page-about .about-mission__stat:hover {
  background: rgba(255, 209, 102, 0.09);
}

.page-about .about-mission__stat .data-num {
  font-family: var(--font-mono);
  font-size: clamp(1.625rem, 3vw, 2.125rem);
  font-weight: 700;
  color: var(--c-accent);
  line-height: 1.15;
  display: block;
  white-space: nowrap;
}

.page-about .about-mission__stat .data-label {
  font-size: 0.813rem;
  color: var(--c-muted);
  margin-top: 0.375rem;
  display: block;
  letter-spacing: 0.04em;
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-milestones {
  background: repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 18px,
    rgba(255, 209, 102, 0.025) 18px,
    rgba(255, 209, 102, 0.025) 19px
  ), var(--c-bg);
}

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

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--c-line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 2rem;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--c-accent);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(255, 209, 102, 0.12);
  transition: background var(--transition), box-shadow var(--transition);
}

.page-about .about-timeline__item:hover::before {
  background: var(--c-accent-2);
  box-shadow: 0 0 0 6px rgba(248, 90, 42, 0.2);
}

.page-about .about-timeline__item:hover .about-timeline__year {
  color: var(--c-accent-2);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--c-accent);
  margin-bottom: 0.375rem;
  transition: color var(--transition);
}

.page-about .about-timeline__body h3 {
  font-family: var(--font-head);
  font-size: 1.25rem;
  color: var(--c-text-strong);
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}

.page-about .about-timeline__body p {
  font-size: 0.938rem;
  line-height: 1.65;
  color: var(--c-muted);
  margin: 0;
  max-width: 34em;
}

.page-about .about-milestones__visual {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
}

.page-about .about-milestones__visual .img-frame {
  width: 100%;
  margin: 0;
}

.page-about .about-milestones__caption {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--c-muted);
  margin: 0;
  align-self: flex-end;
}

/* ---------- 团队与资质 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, var(--c-bg) 0%, rgba(18, 57, 92, 0.28) 100%);
}

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

.page-about .about-team__content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .about-team__content p {
  line-height: 1.7;
  margin: 0;
  color: var(--c-text);
  max-width: 38em;
}

.page-about .about-team__lead {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-text-strong) !important;
  line-height: 1.45;
}

.page-about .about-team__creds {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.875rem;
  margin: 0.5rem 0;
}

.page-about .about-team__cred {
  padding: 1.25rem 1.375rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .about-team__cred:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10, 37, 64, 0.2);
}

.page-about .about-team__cred-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-bg);
  letter-spacing: 0.02em;
}

.page-about .about-team__cred-desc {
  font-size: 0.875rem;
  color: rgba(10, 37, 64, 0.72);
}

.page-about .about-team__footnote {
  font-size: 0.938rem;
  color: var(--c-muted) !important;
  padding-top: 0.5rem;
}

.page-about .about-team__img {
  width: 100%;
  min-width: 0;
  align-self: center;
}

/* ---------- 数据合作 ---------- */
.page-about .about-data {
  background: linear-gradient(180deg, rgba(18, 57, 92, 0.28) 0%, var(--c-bg) 100%);
}

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

.page-about .about-data__text {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .about-data__text p {
  line-height: 1.7;
  margin: 0;
  color: var(--c-text);
  max-width: 42em;
}

.page-about .about-data__lead {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--c-text-strong) !important;
  line-height: 1.5;
}

.page-about .about-data__steps {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.25rem;
}

.page-about .about-data__step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.125rem 1.25rem;
  background: rgba(234, 242, 248, 0.04);
  border-left: 3px solid var(--c-accent);
  transition: background var(--transition), border-color var(--transition);
}

.page-about .about-data__step:hover {
  background: rgba(234, 242, 248, 0.08);
  border-color: var(--c-accent-2);
}

.page-about .about-data__step-num {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--c-accent);
  line-height: 1.6;
  flex: 0 0 auto;
  min-width: 1.5rem;
}

.page-about .about-data__step-copy {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.page-about .about-data__step-title {
  font-size: 0.938rem;
  font-weight: 700;
  color: var(--c-text-strong);
}

.page-about .about-data__step-desc {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--c-muted);
}

.page-about .about-data__note {
  font-size: 0.875rem;
  color: var(--c-muted) !important;
  padding-top: 0.25rem;
}

.page-about .about-data__img {
  width: 100%;
  min-width: 0;
  align-self: center;
}

/* ---------- 结语 ---------- */
.page-about .about-closing {
  padding: 0.5rem 0 4.5rem;
  position: relative;
}

.page-about .about-closing::before {
  content: "TRUST";
  position: absolute;
  right: -0.1em;
  top: 1rem;
  font-family: var(--font-head);
  font-size: clamp(4rem, 12vw, 9rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(234, 242, 248, 0.04);
  pointer-events: none;
  white-space: nowrap;
}

.page-about .about-closing__panel {
  position: relative;
  overflow: hidden;
  padding: 2rem;
  background: linear-gradient(135deg, var(--c-bg-2) 0%, var(--c-bg-3) 100%);
  border: 1px solid var(--c-line);
}

.page-about .about-closing__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-accent-strong) 50%, var(--c-accent-2) 100%);
}

.page-about .about-closing__panel::after {
  content: "⇒";
  position: absolute;
  right: 1.5rem;
  bottom: 0.75rem;
  font-size: 3.5rem;
  font-weight: 700;
  color: rgba(255, 209, 102, 0.08);
  pointer-events: none;
  line-height: 1;
}

.page-about .about-closing__kicker {
  color: var(--c-accent);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  margin-bottom: 0.875rem;
  display: block;
}

.page-about .about-closing h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  color: var(--c-text-strong);
  margin-bottom: 1rem;
  line-height: 1.25;
  max-width: 20em;
}

.page-about .about-closing__text {
  color: var(--c-text);
  line-height: 1.7;
  max-width: 46em;
  margin-bottom: 1.5rem;
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  position: relative;
  z-index: 1;
}

/* ---------- 图片框架统一约束 ---------- */
.page-about .img-frame {
  display: block;
  overflow: hidden;
  background: rgba(18, 57, 92, 0.4);
}

.page-about .img-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform var(--transition);
}

.page-about .img-frame:hover img {
  transform: scale(1.02);
}

/* ---------- 桌面端布局 ---------- */
@media (min-width: 640px) {
  .page-about .about-mission__stats {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-mission__stat:first-child {
    grid-column: 1 / -1;
  }

  .page-about .about-mission__stat:nth-child(3) {
    border-right: 1px solid var(--c-line-soft);
  }

  .page-about .about-team__creds {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about .about-intro__grid {
    grid-template-columns: 1.4fr 1fr;
    gap: 4rem;
    align-items: start;
  }

  .page-about .about-intro__dir {
    margin-top: 1rem;
  }

  .page-about .about-mission__grid {
    grid-template-columns: 1.1fr 1fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .about-milestones__grid {
    grid-template-columns: 1.15fr 1fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-milestones__visual {
    margin-top: 0.25rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.15fr 1fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .about-team__content {
    padding-right: 1rem;
  }

  .page-about .about-data__grid {
    grid-template-columns: 1fr 1.1fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .about-data__img {
    order: 0;
  }

  .page-about .about-data__text {
    order: 1;
  }

  .page-about .about-closing__panel {
    padding: 3rem 3.5rem;
  }
}

/* ---------- 降低动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    box-shadow: none !important;
  }

  .page-about .img-frame:hover img {
    transform: none;
  }
}