/* ===== 品牌故事页 · page-about ===== */
.page-about {
  --about-deep: var(--c-deep);
  --about-navy: var(--c-navy);
  --about-red: var(--c-red);
  --about-gold: var(--c-gold);
  --about-light-gold: var(--c-light-gold);
  --about-slate: var(--c-slate);
  background: var(--about-deep);
  color: var(--c-white);
  overflow-x: hidden;
}

.page-about .about-origin,
.page-about .about-milestones,
.page-about .about-philosophy,
.page-about .about-data,
.page-about .about-ecosystem {
  scroll-margin-top: 96px;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding: 128px 0 72px;
  background:
    linear-gradient(118deg, transparent 0%, transparent 72%, rgba(228, 0, 43, 0.25) 72%, rgba(228, 0, 43, 0.25) 100%),
    linear-gradient(165deg, var(--about-deep) 0%, var(--about-navy) 100%);
  border-bottom: 4px solid var(--about-red);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 180px;
  height: 180px;
  background: linear-gradient(135deg, transparent 50%, rgba(255, 196, 0, 0.12) 50%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 12px;
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--about-slate);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
  align-items: center;
  padding-top: 44px;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-number);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--about-gold);
  text-transform: uppercase;
  margin: 0 0 18px;
  padding-left: 30px;
  position: relative;
}

.page-about .about-hero__kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 22px;
  height: 4px;
  background: var(--about-red);
  transform: translateY(-50%);
  clip-path: polygon(0 0, 100% 0, 78% 100%, 0 100%);
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.125rem, 6vw, 3.25rem);
  line-height: 1.06;
  letter-spacing: 0.02em;
  margin: 0 0 18px;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-slate);
  max-width: 36em;
  margin: 0 0 28px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-hero__visual {
  position: relative;
  min-height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 6% 2%;
  background:
    linear-gradient(135deg, transparent 46%, rgba(228, 0, 43, 0.3) 46%, rgba(228, 0, 43, 0.3) 50%, transparent 50%),
    radial-gradient(circle at center, transparent 55%, rgba(255, 196, 0, 0.08) 56%, transparent 57%);
  border-radius: 50%;
}

.page-about .about-hero__svg {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 400px;
  height: auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.35));
}

/* ===== 品牌起源 ===== */
.page-about .about-origin {
  padding: 80px 0 64px;
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-top: 40px;
}

.page-about .about-origin__text p {
  line-height: 1.9;
  color: var(--about-slate);
  margin: 0 0 16px;
}

.page-about .about-origin__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-origin__stats .metric {
  background: var(--about-navy);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 20px 12px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-about .about-origin__stats .metric::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 30px;
  height: 4px;
  background: var(--about-red);
  transform: skewX(-35deg);
}

.page-about .about-origin__stats .metric-value {
  display: block;
  font-family: var(--font-number);
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--about-gold);
  line-height: 1.2;
}

.page-about .about-origin__stats .metric-label {
  display: block;
  font-size: 0.8125rem;
  color: var(--about-slate);
  margin-top: 4px;
}

.page-about .about-origin__media {
  margin: 0;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  position: relative;
  padding: 80px 0;
  background: var(--about-navy);
  border-top: 4px solid rgba(255, 196, 0, 0.55);
  border-bottom: 4px solid rgba(228, 0, 43, 0.45);
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.page-about .about-milestones > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline {
  margin-top: 48px;
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 44px;
}

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

.page-about .about-timeline__rail {
  position: absolute;
  left: 20px;
  top: 4px;
  bottom: 0;
  width: 3px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 2px;
}

.page-about .about-timeline__item:last-child .about-timeline__rail {
  display: none;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -7px;
  top: 0;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--about-red);
  border: 3px solid var(--about-deep);
  box-shadow: 0 0 0 3px rgba(228, 0, 43, 0.3);
}

.page-about .about-timeline__year {
  display: flex;
  align-items: center;
  padding-left: 56px;
  margin-bottom: 10px;
}

.page-about .about-timeline__year-num {
  font-family: var(--font-number);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--about-gold);
  line-height: 1;
  letter-spacing: 0.04em;
}

.page-about .about-timeline__card {
  margin-left: 56px;
  background: var(--about-deep);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-left: 4px solid var(--about-red);
  border-radius: var(--radius);
  padding: 20px 22px;
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}

@media (hover: hover) {
  .page-about .about-timeline__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
  }
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin: 0 0 10px;
  letter-spacing: 0.05em;
}

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

.page-about .about-timeline__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.page-about .about-milestones__media {
  margin: 56px 0 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

/* ===== 服务理念 ===== */
.page-about .about-philosophy {
  padding: 80px 0 64px;
  background:
    linear-gradient(115deg, transparent 0%, transparent 92%, rgba(255, 196, 0, 0.5) 92%, rgba(255, 196, 0, 0.5) 100%),
    var(--about-deep);
}

.page-about .about-philosophy__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 44px;
}

.page-about .about-philosophy__item {
  position: relative;
  background: var(--about-navy);
  border-radius: var(--radius);
  padding: 28px 24px 24px;
  border-bottom: 4px solid var(--about-red);
  overflow: hidden;
}

.page-about .about-philosophy__item::before {
  content: "";
  position: absolute;
  top: -24px;
  right: -14px;
  width: 80px;
  height: 80px;
  background: rgba(228, 0, 43, 0.12);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.page-about .about-philosophy__num {
  display: inline-block;
  font-family: var(--font-number);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--about-light-gold);
  letter-spacing: 0.14em;
  margin-bottom: 12px;
  padding: 4px 10px;
  border: 1px solid rgba(255, 196, 0, 0.4);
  border-radius: 4px;
}

.page-about .about-philosophy__item h3 {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  margin: 0 0 12px;
  letter-spacing: 0.04em;
}

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

/* ===== 数据规模 ===== */
.page-about .about-data {
  position: relative;
  padding: 80px 0;
  background:
    linear-gradient(145deg, transparent 0%, transparent 70%, rgba(228, 0, 43, 0.18) 70%),
    var(--about-navy);
  border-top: 4px solid rgba(255, 255, 255, 0.08);
}

.page-about .about-data__panel {
  margin-top: 44px;
  background: var(--about-deep);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.09);
  padding: 28px 20px;
}

.page-about .about-data__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.page-about .about-data__stat {
  text-align: center;
  padding: 16px 8px;
  background: var(--about-navy);
  border-radius: 10px;
  position: relative;
}

.page-about .about-data__stat::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 20%;
  right: 20%;
  height: 3px;
  background: linear-gradient(90deg, var(--about-red), var(--about-gold));
  border-radius: 2px;
}

.page-about .about-data__num {
  display: block;
  font-family: var(--font-number);
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--about-gold);
  line-height: 1.1;
}

.page-about .about-data__label {
  display: block;
  font-size: 0.8125rem;
  color: var(--about-slate);
  margin-top: 6px;
}

.page-about .about-data__media {
  margin: 28px 0 0;
}

/* ===== 合作生态 ===== */
.page-about .about-ecosystem {
  padding: 80px 0 64px;
}

.page-about .about-ecosystem__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 44px;
}

.page-about .about-ecosystem__col {
  background: var(--about-navy);
  border-radius: var(--radius);
  padding: 28px 24px;
  border-top: 4px solid var(--about-red);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}

@media (hover: hover) {
  .page-about .about-ecosystem__col:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
  }
}

.page-about .about-ecosystem__col h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin: 0 0 12px;
  letter-spacing: 0.05em;
}

.page-about .about-ecosystem__col p {
  color: var(--about-slate);
  line-height: 1.75;
  font-size: 0.9375rem;
  margin: 0 0 16px;
}

.page-about .about-ecosystem__list {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
}

.page-about .about-ecosystem__list li {
  position: relative;
  padding-left: 22px;
  line-height: 1.7;
  color: var(--c-white);
  font-size: 0.9375rem;
  margin-bottom: 6px;
}

.page-about .about-ecosystem__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 10px;
  height: 4px;
  background: var(--about-gold);
  clip-path: polygon(0 0, 100% 0, 80% 100%, 0 100%);
}

.page-about .about-ecosystem__list li:nth-child(2)::before {
  background: var(--about-red);
}

.page-about .about-ecosystem__list li:nth-child(3)::before {
  background: var(--about-light-gold);
}

/* ===== 滚动显现 ===== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-about [data-reveal][data-visible] {
  opacity: 1;
  transform: none;
}

/* ===== 平板端 ≥ 768px ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 148px 0 84px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 32px;
  }

  .page-about .about-hero__lead {
    font-size: 1.0625rem;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 140px 48px 1fr;
    column-gap: 16px;
    align-items: start;
    padding-bottom: 44px;
  }

  .page-about .about-timeline__year {
    padding-left: 0;
    justify-content: flex-end;
    text-align: right;
    margin-bottom: 0;
    padding-top: 2px;
  }

  .page-about .about-timeline__rail {
    position: relative;
    left: auto;
    top: 6px;
    height: calc(100% + 10px);
    width: 3px;
  }

  .page-about .about-timeline__item:last-child .about-timeline__rail {
    display: block;
    height: 24px;
    background: rgba(255, 255, 255, 0.08);
  }

  .page-about .about-timeline__card {
    margin-left: 0;
  }

  .page-about .about-philosophy__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-data__panel {
    padding: 40px 32px;
  }

  .page-about .about-data__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-ecosystem__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

/* ===== 桌面端 ≥ 1024px ===== */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 172px 0 96px;
  }

  .page-about .about-hero__lead {
    font-size: 1.125rem;
  }

  .page-about .about-origin,
  .page-about .about-philosophy,
  .page-about .about-ecosystem {
    padding: 104px 0 80px;
  }

  .page-about .about-milestones,
  .page-about .about-data {
    padding: 104px 0;
  }

  .page-about .about-data__num {
    font-size: 2.25rem;
  }

  .page-about .about-timeline__year-num {
    font-size: 2rem;
  }

  .page-about .about-timeline__card {
    padding: 24px 28px;
  }
}

/* ===== 减弱动效 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-timeline__card,
  .page-about .about-ecosystem__col {
    transition: none;
  }
}