.page-about {
  overflow-x: hidden;
  background: var(--c-dark);
}

/* ===== 顶部横幅 ===== */
.page-about .about-hero {
  position: relative;
  padding: 1.75rem 0 3.5rem;
  background:
    radial-gradient(120% 160% at 85% -20%, rgba(230, 0, 0, 0.28) 0%, transparent 42%),
    linear-gradient(180deg, #0d0d0d 0%, var(--c-dark) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -3.5rem;
  top: 5rem;
  width: 9rem;
  height: 18rem;
  background: var(--c-red);
  transform: rotate(-14deg);
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 6%;
  top: 5.8rem;
  width: 4px;
  height: 7rem;
  background: var(--c-gold);
  transform: rotate(-14deg);
  z-index: 1;
}

.page-about .about-hero > .container:first-child {
  position: relative;
  z-index: 3;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 2.25rem;
  padding-top: 2.5rem;
}

.page-about .about-hero__copy {
  max-width: 36rem;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.page-about .about-hero__copy h1 {
  margin: 0 0 1.25rem;
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-about .about-hero__lead {
  margin: 0 0 1.75rem;
  max-width: 28rem;
  font-size: 1.05rem;
  line-height: 1.7;
  color: #c9c9c9;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  border-left: 2px solid var(--c-gold);
  padding-left: 1.25rem;
}

.page-about .about-hero__stat-num {
  font-family: var(--font-head);
  font-size: clamp(3.5rem, 10vw, 6rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-red-hover);
}

.page-about .about-hero__stat-label {
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--c-grey);
}

/* ===== 品牌起源 ===== */
.page-about .about-origin {
  padding: 4rem 0;
  background: var(--c-dark);
}

.page-about .about-origin__grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.page-about .about-origin__copy h2 {
  margin: 0.75rem 0 1.5rem;
  font-family: var(--font-head);
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-about .about-origin__copy p {
  margin-bottom: 1rem;
  max-width: 34rem;
  color: #c9c9c9;
  line-height: 1.8;
}

.page-about .about-origin__points {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-origin__points li {
  padding-left: 1.5rem;
  border-left: 2px solid var(--c-red);
  font-size: 0.95rem;
  color: var(--c-text);
}

.page-about .about-origin__figure {
  margin: 0;
  position: relative;
}

.page-about .about-origin__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  clip-path: polygon(5% 0, 100% 0, 95% 100%, 0 100%);
  filter: saturate(1.15);
}

.page-about .about-origin__figure figcaption {
  margin-top: 0.5rem;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--c-grey);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestone {
  padding: 4rem 0 3rem;
  background: var(--c-dark-lt);
}

.page-about .about-milestone__timeline {
  position: relative;
  margin-top: 2.5rem;
  padding-left: 3.75rem;
}

.page-about .about-milestone__timeline::before {
  content: "";
  position: absolute;
  left: 1.75rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--c-red) 0%,
    var(--c-grey) 18%,
    var(--c-grey) 82%,
    var(--c-red) 100%
  );
}

.page-about .milestone-item {
  position: relative;
  padding-bottom: 2.5rem;
}

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

.page-about .milestone-item::before {
  content: "";
  position: absolute;
  left: 1.5rem;
  top: 0.55rem;
  width: 0;
  height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 10px solid var(--c-red);
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .milestone-item:hover::before,
.page-about .milestone-item:focus-within::before {
  opacity: 1;
  transform: translateX(0);
}

.page-about .milestone-item__year {
  position: absolute;
  left: 0;
  top: 0.25rem;
  width: 1.25rem;
  margin: 0;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--c-gold);
  transition: color 0.3s var(--ease);
}

.page-about .milestone-item:hover .milestone-item__year {
  color: var(--c-red-hover);
}

.page-about .milestone-item__card {
  position: relative;
  z-index: 0;
  max-width: 640px;
  padding: 1.5rem 1.25rem 1.5rem 1.75rem;
  background: linear-gradient(135deg, #1c1c1c 0%, #131313 100%);
  border-left: 3px solid var(--c-red);
  clip-path: polygon(1rem 0, 100% 0, calc(100% - 1rem) 100%, 0 100%);
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease);
}

.page-about .milestone-item__card::before {
  content: attr(data-year);
  position: absolute;
  z-index: -1;
  top: 1rem;
  right: 1.25rem;
  font-family: var(--font-head);
  font-size: 3.6rem;
  line-height: 1;
  color: var(--c-red);
  opacity: 0.14;
  pointer-events: none;
  transition: color 0.4s var(--ease), opacity 0.4s var(--ease);
}

.page-about .milestone-item:hover .milestone-item__card {
  background: linear-gradient(135deg, #241414 0%, #1a1a1a 100%);
  border-left-color: var(--c-gold);
}

.page-about .milestone-item:hover .milestone-item__card::before {
  color: var(--c-gold);
  opacity: 0.28;
}

.page-about .milestone-item__card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-size: 1.2rem;
  line-height: 1.3;
  color: var(--c-text);
}

.page-about .milestone-item__card p {
  margin: 0;
  color: #b8b8b8;
  font-size: 0.95rem;
  line-height: 1.7;
}

.page-about .milestone-item__figure {
  margin: 1.5rem 0 0;
}

.page-about .milestone-item__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  clip-path: polygon(8% 0, 92% 0, 100% 100%, 0 100%);
}

/* ===== 使命与愿景 ===== */
.page-about .about-mission {
  padding: 4rem 0;
  background: linear-gradient(180deg, var(--c-dark) 0%, #0d0d0d 100%);
}

.page-about .about-mission__grid {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-mission__block {
  position: relative;
  padding: 2.25rem 1.5rem;
}

.page-about .about-mission__block--red {
  background: var(--c-red);
  clip-path: polygon(0 0, 100% 0, calc(100% - 1.5rem) 100%, 0 100%);
}

.page-about .about-mission__block--red h2 {
  margin: 0.75rem 0 1.25rem;
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.2;
  color: var(--c-text);
}

.page-about .about-mission__block--red p {
  margin-bottom: 1.75rem;
  max-width: 30rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
}

.page-about .about-mission__block--red .btn--ghost {
  border-color: rgba(255, 255, 255, 0.85);
  color: var(--c-text);
}

.page-about .about-mission__block--gold {
  border: 1px solid rgba(255, 215, 0, 0.3);
  background: var(--c-dark-lt);
  clip-path: polygon(1.5rem 0, 100% 0, 100% 100%, 0 calc(100% - 1rem));
}

.page-about .about-mission__block--gold h3 {
  margin: 0.75rem 0 1.25rem;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  color: var(--c-gold);
}

.page-about .about-mission__block--gold p {
  margin-bottom: 1.5rem;
  max-width: 30rem;
  color: #d5d5d5;
  line-height: 1.8;
}

.page-about .about-mission__principles {
  margin: 1.5rem 0 2rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.5rem;
}

.page-about .about-mission__tag {
  display: inline-block;
  margin-right: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--c-gold);
}

/* ===== 服务数据 ===== */
.page-about .about-stats {
  position: relative;
  padding: 4rem 0;
  background: linear-gradient(180deg, #0d0d0d 0%, var(--c-dark) 100%);
  overflow: hidden;
}

.page-about .about-stats__bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.page-about .about-stats__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  filter: saturate(0.7) contrast(1.1);
}

.page-about .about-stats__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    115deg,
    rgba(10, 10, 10, 0.82) 0%,
    rgba(10, 10, 10, 0.35) 60%,
    rgba(230, 0, 0, 0.15) 100%
  );
}

.page-about .about-stats .container {
  position: relative;
  z-index: 2;
}

.page-about .about-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 2.5rem 0 2rem;
}

.page-about .stat-item {
  padding: 1.25rem 0 1.25rem 1rem;
  border-left: 3px solid var(--c-gold);
}

.page-about .stat-item__value {
  font-family: var(--font-head);
  font-size: clamp(2rem, 6vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-about .stat-item__label {
  margin: 0.25rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--c-grey);
}

.page-about .about-stats__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: space-between;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.page-about .about-stats__foot p {
  margin: 0;
  max-width: 42rem;
  color: #b5b5b5;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 3rem 0 5rem;
  }

  .page-about .about-hero::before {
    width: 16rem;
    height: 30rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1fr auto;
    gap: 3rem;
    align-items: end;
    padding-top: 3rem;
  }

  .page-about .about-hero__stat {
    min-width: 18rem;
  }

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

  .page-about .about-origin__grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
  }

  .page-about .about-milestone {
    padding: 5rem 0 4rem;
  }

  .page-about .about-milestone__timeline {
    padding-left: 7rem;
  }

  .page-about .about-milestone__timeline::before {
    left: 5.25rem;
  }

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

  .page-about .milestone-item::before {
    left: 5rem;
  }

  .page-about .milestone-item__year {
    top: 0.4rem;
    width: 4rem;
    font-size: 0.85rem;
  }

  .page-about .milestone-item__card {
    padding: 2rem 1.75rem 2rem 2.25rem;
    clip-path: polygon(1.5rem 0, 100% 0, calc(100% - 1.5rem) 100%, 0 100%);
  }

  .page-about .milestone-item__card::before {
    top: 1.4rem;
    right: 1.6rem;
    font-size: 4.4rem;
  }

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

  .page-about .about-mission__grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .page-about .about-mission__block {
    padding: 3rem 2rem;
  }

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

  .page-about .about-stats__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
  }
}