.page-about {
  --about-glow: rgba(230, 180, 0, 0.16);
  --about-signal: rgba(255, 255, 255, 0.08);
  background: var(--c-paper);
  color: var(--c-ink);
  overflow-x: hidden;
  font-family: var(--f-body);
}

.page-about .container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
  box-sizing: border-box;
}

.page-about .about-mission,
.page-about .about-timeline,
.page-about .about-tech,
.page-about .about-trust {
  padding: 64px 0 72px;
  position: relative;
}

/* 面包屑 */
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  font-size: 13px;
}
.page-about .breadcrumb__link {
  color: rgba(255, 255, 255, 0.68);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .breadcrumb__link:hover {
  color: var(--c-gold);
  border-color: var(--c-gold);
}
.page-about .breadcrumb__current {
  color: var(--c-gold);
}

/* ===== 首屏：英雄横幅 ===== */
.page-about .about-hero {
  position: relative;
  background: linear-gradient(160deg, var(--c-deep) 0%, var(--c-deep-2) 55%, #15365f 100%);
  color: var(--c-white);
  padding: 32px 0 0;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  top: -8%;
  width: 58%;
  height: 72%;
  background: linear-gradient(135deg, rgba(230, 180, 0, 0.22), rgba(255, 152, 0, 0.04));
  clip-path: polygon(22% 0, 100% 0, 100% 88%, 0 100%);
  pointer-events: none;
  z-index: 1;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 56px;
  background: var(--c-paper);
  clip-path: polygon(0 100%, 100% 28px, 100% 100%);
  pointer-events: none;
  z-index: 6;
}
.page-about .about-hero__container {
  position: relative;
  z-index: 3;
}
.page-about .about-hero__content {
  padding: 28px 0 40px;
  max-width: 620px;
}
.page-about .about-hero__kicker {
  font-family: var(--f-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin: 0 0 10px;
}
.page-about .about-hero__title {
  font-family: var(--f-title);
  font-size: clamp(42px, 9vw, 76px);
  line-height: 1.02;
  letter-spacing: 0.02em;
  margin: 0 0 16px;
  color: var(--c-white);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  text-transform: uppercase;
}
.page-about .about-hero__title-en {
  color: var(--c-gold);
}
.page-about .about-hero__lead {
  font-size: 17px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
  margin: 0 0 24px;
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.page-about .status-live {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-body);
  font-size: 13px;
  color: var(--c-gold);
  border: 1px solid rgba(230, 180, 0, 0.4);
  padding: 6px 12px;
  background: rgba(230, 180, 0, 0.08);
}
.page-about .status-live__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 3px rgba(230, 180, 0, 0.2);
}
.page-about .about-hero__meta-item {
  font-family: var(--f-title);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-white);
  background: var(--about-signal);
  border: 1px solid rgba(230, 180, 0, 0.36);
  padding: 6px 12px;
  white-space: nowrap;
}
.page-about .about-hero__media {
  position: relative;
  margin-top: 8px;
  z-index: 2;
}
.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  filter: grayscale(1) contrast(1.06) sepia(0.06);
}
.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(11, 42, 74, 0.08) 0%, rgba(11, 42, 74, 0.5) 100%);
}
.page-about .about-hero__year {
  position: absolute;
  right: 4%;
  bottom: 40px;
  z-index: 4;
  font-family: var(--f-title);
  font-size: clamp(80px, 18vw, 160px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-gold);
  text-shadow: 0 4px 24px rgba(11, 42, 74, 0.36);
}

/* ===== 品牌使命 ===== */
.page-about .about-mission {
  background: var(--c-paper);
}
.page-about .about-mission__grid {
  display: grid;
  gap: 40px;
}
.page-about .about-mission__label,
.page-about .about-tech__label,
.page-about .about-trust__label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.page-about .about-mission__num,
.page-about .about-tech__num,
.page-about .about-trust__num,
.page-about .about-timeline__num {
  font-family: var(--f-title);
  font-size: 24px;
  line-height: 1;
  color: var(--c-orange);
}
.page-about .about-mission__title,
.page-about .about-tech__title,
.page-about .about-trust__title {
  font-family: var(--f-title);
  font-size: clamp(28px, 5vw, 38px);
  line-height: 1.18;
  letter-spacing: 0.01em;
  margin: 0 0 18px;
  color: var(--c-ink);
}
.page-about .about-mission__text {
  font-size: 16px;
  line-height: 1.75;
  color: rgba(26, 26, 26, 0.78);
  margin: 0 0 16px;
}
.page-about .about-mission__link {
  display: inline-block;
  margin-top: 6px;
  color: var(--c-deep);
  font-family: var(--f-body);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--c-gold);
  transition: border-color 0.2s ease;
}
.page-about .about-mission__link:hover {
  border-color: var(--c-orange);
}
.page-about .about-mission__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.page-about .about-mission__stat {
  background: var(--c-white);
  padding: 20px 16px;
  border-top: 3px solid var(--c-gold);
  box-shadow: 0 2px 10px rgba(11, 42, 74, 0.08);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.page-about .about-mission__stat:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 26px rgba(11, 42, 74, 0.12);
}
.page-about .about-mission__stat .stat-number {
  display: block;
  font-family: var(--f-title);
  font-size: clamp(30px, 7vw, 46px);
  line-height: 1.04;
  color: var(--c-deep);
}
.page-about .about-mission__stat .stat-label {
  display: block;
  margin-top: 8px;
  font-family: var(--f-body);
  font-size: 14px;
  color: rgba(26, 26, 26, 0.6);
}

/* ===== 发展历程 ===== */
.page-about .about-timeline {
  background: var(--c-deep);
  color: var(--c-white);
}
.page-about .about-timeline__heading {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 44px;
}
.page-about .about-timeline__heading-text {
  display: block;
}
.page-about .about-timeline__accent {
  display: block;
  font-family: var(--f-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin-bottom: 6px;
}
.page-about .about-timeline__heading-text h2 {
  font-family: var(--f-title);
  font-size: clamp(28px, 5vw, 38px);
  line-height: 1.18;
  letter-spacing: 0.01em;
  margin: 0;
  color: var(--c-white);
}
.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    rgba(230, 180, 0, 0.5) 0,
    rgba(230, 180, 0, 0.5) 6px,
    transparent 6px,
    transparent 14px
  );
}
.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 52px 46px;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 5px rgba(230, 180, 0, 0.18);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.page-about .about-timeline__item:hover::before {
  transform: scale(1.12);
  box-shadow: 0 0 0 10px rgba(230, 180, 0, 0.22);
}
.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--f-title);
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-gold);
  background: rgba(27, 58, 95, 0.72);
  border-left: 4px solid var(--c-gold);
  padding: 9px 14px;
  margin-bottom: 10px;
}
.page-about .about-timeline__event-title {
  font-family: var(--f-title);
  font-size: 21px;
  line-height: 1.3;
  margin: 0 0 8px;
  color: var(--c-white);
}
.page-about .about-timeline__event-text {
  font-family: var(--f-body);
  font-size: 15px;
  line-height: 1.75;
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
}

/* ===== 技术实力 ===== */
.page-about .about-tech {
  background: var(--c-white);
}
.page-about .about-tech__grid {
  display: grid;
  gap: 40px;
}
.page-about .about-tech__lede {
  font-size: 16px;
  line-height: 1.75;
  margin: 0 0 18px;
  color: rgba(26, 26, 26, 0.78);
}
.page-about .about-tech__list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-tech__item {
  position: relative;
  padding-left: 30px;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(26, 26, 26, 0.82);
}
.page-about .about-tech__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 10px;
  height: 5px;
  border-left: 3px solid var(--c-gold);
  border-bottom: 3px solid var(--c-gold);
  transform: rotate(-45deg);
}
.page-about .about-tech__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 4px;
}
.page-about .about-tech__more {
  font-family: var(--f-body);
  font-weight: 700;
  color: var(--c-deep);
  text-decoration: none;
  border-bottom: 2px solid var(--c-gold);
  padding-bottom: 2px;
  transition: border-color 0.2s ease;
}
.page-about .about-tech__more:hover {
  border-color: var(--c-orange);
}
.page-about .about-tech__figure {
  position: relative;
  margin: 0;
}
.page-about .about-tech__figure::before {
  content: "";
  position: absolute;
  top: 12px;
  right: -8px;
  bottom: -8px;
  left: 12px;
  background: var(--c-deep);
  z-index: 0;
}
.page-about .about-tech__frame,
.page-about .about-trust__frame {
  position: relative;
  z-index: 1;
  margin: 0;
  overflow: hidden;
}
.page-about .about-tech__frame {
  aspect-ratio: 8 / 5;
  background: var(--c-deep-2);
}
.page-about .about-tech__frame img,
.page-about .about-trust__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}
.page-about .image-frame:hover img {
  transform: scale(1.03);
}
.page-about .about-tech__caption,
.page-about .about-trust__caption {
  margin: 12px 0 0;
  font-family: var(--f-body);
  font-size: 13px;
  line-height: 1.5;
  color: rgba(26, 26, 26, 0.6);
}

/* ===== 用户与信任 ===== */
.page-about .about-trust {
  background: var(--c-paper);
}
.page-about .about-trust__grid {
  display: grid;
  gap: 40px;
}
.page-about .about-trust__copy {
  order: 1;
}
.page-about .about-trust__figure {
  position: relative;
  order: 2;
  margin: 0;
}
.page-about .about-trust__figure::before {
  content: "";
  position: absolute;
  top: -8px;
  right: 12px;
  bottom: 12px;
  left: -8px;
  background: rgba(230, 180, 0, 0.32);
  z-index: 0;
}
.page-about .about-trust__frame {
  aspect-ratio: 3 / 2;
  background: var(--c-deep-2);
}
.page-about .about-trust__text {
  font-size: 16px;
  line-height: 1.75;
  margin: 0 0 24px;
  color: rgba(26, 26, 26, 0.78);
}
.page-about .about-trust__cert {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--c-white);
  border-left: 4px solid var(--c-gold);
  box-shadow: 0 2px 8px rgba(11, 42, 74, 0.06);
  margin: 0 0 20px;
}
.page-about .about-trust__cert-label {
  font-size: 14px;
  color: rgba(26, 26, 26, 0.62);
}
.page-about .about-trust__cert-value {
  font-family: var(--f-title);
  font-size: 22px;
  letter-spacing: 0.03em;
  color: var(--c-deep);
}
.page-about .status-panel {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--c-deep);
  color: var(--c-white);
  padding: 18px 20px;
  margin: 24px 0 0;
}
.page-about .status-panel__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 5px;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px rgba(230, 180, 0, 0.2);
}
.page-about .about-trust__panel-title {
  display: block;
  font-size: 16px;
  font-weight: 700;
}
.page-about .about-trust__panel-note {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.66);
}
.page-about .about-trust__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}
.page-about .about-trust__signal {
  height: 6px;
  margin-top: 56px;
  background: linear-gradient(
    90deg,
    var(--c-gold) 0,
    var(--c-gold) 38%,
    var(--c-orange) 38%,
    var(--c-orange) 70%,
    var(--c-red) 70%,
    var(--c-red) 100%
  );
}

/* ===== 按钮统一 ===== */
.page-about .btn {
  display: inline-block;
  padding: 12px 22px;
  font-family: var(--f-title);
  font-size: 15px;
  letter-spacing: 0.06em;
  text-decoration: none;
  border: 2px solid transparent;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.page-about .btn--gold {
  background: var(--c-gold);
  color: var(--c-deep);
}
.page-about .btn--gold:hover {
  transform: translateY(-2px);
  border-color: var(--c-orange);
}
.page-about .btn--outline {
  background: transparent;
  border-color: rgba(11, 42, 74, 0.35);
  color: var(--c-deep);
}
.page-about .btn--outline:hover {
  border-color: var(--c-gold);
}

/* ===== 桌面端栅格与节奏 ===== */
@media (min-width: 860px) {
  .page-about .about-mission,
  .page-about .about-timeline,
  .page-about .about-tech,
  .page-about .about-trust {
    padding: 88px 0 96px;
  }
  .page-about .about-hero__content {
    padding: 56px 0 44px;
  }
  .page-about .about-mission__grid {
    grid-template-columns: 1.15fr 1fr;
    gap: 64px;
    align-items: center;
  }
  .page-about .about-tech__grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 72px;
    align-items: center;
  }
  .page-about .about-trust__grid {
    grid-template-columns: 0.9fr 1fr;
    gap: 72px;
    align-items: center;
  }
  .page-about .about-trust__copy {
    order: 2;
  }
  .page-about .about-trust__figure {
    order: 1;
  }
  .page-about .about-tech__figure::before {
    top: 16px;
    right: -16px;
    bottom: -16px;
    left: 16px;
  }
  .page-about .about-trust__figure::before {
    top: -16px;
    right: 16px;
    bottom: 16px;
    left: -16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 1fr 56px 1.85fr;
    gap: 0;
    align-items: start;
    padding-left: 0;
  }
  .page-about .about-timeline__list::before {
    left: 50%;
    transform: translateX(-50%);
  }
  .page-about .about-timeline__item::before {
    left: 50%;
    top: 14px;
    transform: translateX(-50%);
  }
  .page-about .about-timeline__item:hover::before {
    transform: translateX(-50%) scale(1.12);
  }
  .page-about .about-timeline__year {
    justify-self: end;
    text-align: right;
    margin-bottom: 0;
    font-size: clamp(36px, 5vw, 60px);
    background: none;
    border-left: none;
    padding: 0 18px 0 0;
  }
  .page-about .about-timeline__event {
    padding: 2px 0 0 18px;
  }
}