.page-about {
  --about-amber: #D8913A;
  --about-gold-deep: #B8955A;
  --about-rail-w: 3px;
  --about-node: 18px;
  --about-card-bg: rgba(26, 34, 48, 0.85);
  --about-border-glow: rgba(232, 196, 110, 0.34);
  background:
    radial-gradient(circle at 12% 8%, rgba(107, 45, 92, 0.18), transparent 320px),
    radial-gradient(circle at 88% 30%, rgba(216, 145, 58, 0.1), transparent 260px),
    linear-gradient(180deg, #0A0E14 0%, #0C1119 55%, #0A0E14 100%);
  position: relative;
}

.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--ticker-h, 2.25rem) + var(--header-h, 4.5rem) + var(--space-xl, 4rem));
  padding-bottom: var(--space-2xl, 6.5rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 6rem;
  right: -4rem;
  width: 46rem;
  height: 46rem;
  background:
    repeating-linear-gradient(45deg, rgba(232, 196, 110, 0.03) 0 2px, transparent 2px 6px),
    repeating-linear-gradient(-45deg, rgba(232, 196, 110, 0.03) 0 2px, transparent 2px 6px);
  transform: rotate(6deg);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg, 2.5rem);
}

.page-about .section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
  padding: 0.45rem 0.9rem;
  background: linear-gradient(120deg, rgba(232, 196, 110, 0.22) 0%, rgba(232, 196, 110, 0.06) 68%, transparent 100%);
  border-left: 3px solid #E8C46E;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  font-family: var(--font-mono, "Roboto Mono", monospace);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: #E8C46E;
  text-transform: uppercase;
}

.page-about .section-tag__num {
  color: #D8913A;
}

.page-about .about-hero__title {
  font-size: clamp(1.7rem, 4.8vw, 2.7rem);
  line-height: 1.22;
  margin-bottom: 1.2rem;
}

.page-about .about-hero__title-accent {
  display: block;
  margin-top: 0.3rem;
  color: #E8C46E;
  font-size: 0.52em;
  letter-spacing: 0.05em;
}

.page-about .about-hero__subtitle {
  max-width: 34rem;
  color: var(--color-text-muted, #A89F91);
  font-size: 1.05rem;
  line-height: 1.85;
  margin-bottom: var(--space-lg, 2.5rem);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

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

.page-about .about-hero__img {
  width: 100%;
  height: auto;
  max-height: 500px;
  object-fit: cover;
  display: block;
  clip-path: polygon(4% 0, 100% 0, 96% 100%, 0 100%);
  border: 1px solid rgba(232, 196, 110, 0.2);
  filter: saturate(0.92) contrast(1.05);
}

.page-about .about-hero__visual-caption {
  position: absolute;
  bottom: 1rem;
  left: 2.4rem;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.4rem 0.9rem;
  background: rgba(10, 14, 20, 0.78);
  border-left: 2px solid #E8C46E;
  font-family: var(--font-mono, "Roboto Mono", monospace);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--color-text, #F2E9D8);
  backdrop-filter: blur(4px);
}

.page-about .about-hero__visual-num {
  color: #E8C46E;
  font-weight: 700;
  font-size: 0.95rem;
}

/* 品牌理念区块 */
.page-about .about-mission {
  padding: var(--space-2xl, 6.5rem) 0;
  position: relative;
}

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

.page-about .about-mission__tag-col {
  border-left: 1px solid rgba(232, 196, 110, 0.16);
  padding-left: 1.2rem;
}

.page-about .about-mission__content h2 {
  font-size: clamp(1.45rem, 3.2vw, 2.2rem);
  line-height: 1.3;
  margin-bottom: 1.1rem;
}

.page-about .about-mission__content p {
  color: var(--color-text-muted, #A89F91);
  max-width: 44rem;
  font-size: 1rem;
  line-height: 1.9;
  margin-bottom: var(--space-lg, 2.5rem);
}

.page-about .about-mission__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  max-width: 46rem;
}

.page-about .about-mission__fact {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 1.2rem;
  background: var(--color-bg-graphite, #111722);
  border: 1px solid rgba(232, 196, 110, 0.12);
  border-left: 4px solid #D8913A;
}

.page-about .about-mission__fact-num {
  font-family: var(--font-mono, "Roboto Mono", monospace);
  font-size: 1.55rem;
  font-weight: 800;
  color: #E8C46E;
  white-space: nowrap;
}

.page-about .about-mission__fact-label {
  color: var(--color-text-muted, #A89F91);
  font-size: 0.92rem;
}

/* 时间轴区块 */
.page-about .about-timeline {
  padding-bottom: var(--space-2xl, 6.5rem);
  position: relative;
}

.page-about .about-timeline__head {
  margin-bottom: var(--space-xl, 4rem);
}

.page-about .about-timeline__head .page-head__title {
  font-size: clamp(1.45rem, 3.2vw, 2.2rem);
  line-height: 1.3;
  margin-bottom: 0.8rem;
}

.page-about .about-timeline__head .page-head__desc {
  max-width: 38rem;
  color: var(--color-text-muted, #A89F91);
}

.page-about .about-timeline__wrap {
  position: relative;
  padding-left: calc(var(--about-node, 18px) + 1.4rem);
}

.page-about .about-timeline__rail {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--about-rail-w, 3px);
  background: linear-gradient(180deg, rgba(216, 145, 58, 0.14) 0%, rgba(232, 196, 110, 0.42) 50%, rgba(216, 145, 58, 0.14) 100%);
  transform: translateX(calc((var(--about-node, 18px) - var(--about-rail-w, 3px)) / 2));
  z-index: 0;
}

.page-about .about-timeline__rail-line {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(180deg, rgba(232, 196, 110, 0.1) 0 8px, transparent 8px 14px);
}

.page-about .about-milestone {
  display: grid;
  grid-template-columns: 1fr;
  position: relative;
  margin-bottom: var(--space-lg, 2.5rem);
  z-index: 1;
}

.page-about .about-milestone__line {
  position: absolute;
  left: calc((var(--about-node, 18px) + 1.4rem) * -1);
  top: 0;
  bottom: 0;
  width: var(--about-node, 18px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.page-about .about-milestone__node {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #111722;
  border: 3px solid var(--about-amber, #D8913A);
  box-shadow: 0 0 0 4px rgba(216, 145, 58, 0.14), 0 0 16px rgba(216, 145, 58, 0.42);
  margin-top: 1.5rem;
  flex-shrink: 0;
}

.page-about .about-milestone__node--gold {
  border-color: #E8C46E;
  background: rgba(232, 196, 110, 0.88);
  box-shadow: 0 0 0 4px rgba(232, 196, 110, 0.18), 0 0 22px rgba(232, 196, 110, 0.55);
}

.page-about .about-milestone__body {
  background: var(--about-card-bg, rgba(26, 34, 48, 0.85));
  border: 1px solid rgba(232, 196, 110, 0.1);
  border-left: 3px solid var(--about-border-glow, rgba(232, 196, 110, 0.34));
  padding: 1.3rem 1.2rem;
  position: relative;
  backdrop-filter: blur(6px);
  transition: box-shadow 240ms var(--ease-out, cubic-bezier(0.2, 0.9, 0.3, 1.2)), transform 240ms var(--ease-out, cubic-bezier(0.2, 0.9, 0.3, 1.2));
}

.page-about .about-milestone__body::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 64px;
  height: 100%;
  background: repeating-linear-gradient(135deg, transparent 0 10px, rgba(232, 196, 110, 0.025) 10px 20px);
  clip-path: polygon(60% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-milestone__body:hover {
  box-shadow: var(--glow-gold, 0 0 20px rgba(232, 196, 110, 0.2)), 0 8px 28px rgba(0, 0, 0, 0.42);
  transform: translateY(-2px);
}

.page-about .about-milestone__meta {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.5rem;
}

.page-about .about-milestone__code {
  font-family: var(--font-mono, "Roboto Mono", monospace);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--about-amber, #D8913A);
  letter-spacing: 0.04em;
}

.page-about .about-milestone__code--gold {
  color: #E8C46E;
}

.page-about .about-milestone__phase {
  font-family: var(--font-mono, "Roboto Mono", monospace);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(168, 159, 145, 0.9);
  padding: 0.22rem 0.5rem;
  border: 1px solid rgba(232, 196, 110, 0.18);
  background: rgba(10, 14, 20, 0.42);
}

.page-about .about-milestone__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--color-text, #F2E9D8);
}

.page-about .about-milestone__body p {
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--color-text-muted, #A89F91);
  margin: 0;
}

/* 版本迭代区块 */
.page-about .about-versions {
  padding: var(--space-2xl, 6.5rem) 0;
  background: linear-gradient(165deg, rgba(17, 23, 34, 0.6) 0%, transparent 60%);
}

.page-about .about-versions__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl, 4rem);
}

.page-about .about-versions__visual {
  position: relative;
  max-width: 480px;
}

.page-about .about-versions__img {
  width: 100%;
  height: auto;
  max-height: 700px;
  object-fit: cover;
  display: block;
  border: 1px solid rgba(107, 45, 92, 0.42);
  clip-path: polygon(0 3%, 100% 0, 96% 100%, 2% 97%);
}

.page-about .about-versions__badge {
  position: absolute;
  bottom: 1.4rem;
  right: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  background: rgba(107, 45, 92, 0.88);
  border-left: 3px solid #E8C46E;
  backdrop-filter: blur(5px);
}

.page-about .about-versions__badge-num {
  font-family: var(--font-mono, "Roboto Mono", monospace);
  font-size: 1.6rem;
  font-weight: 800;
  color: #E8C46E;
}

.page-about .about-versions__badge-label {
  font-size: 0.8rem;
  color: rgba(242, 233, 216, 0.92);
  letter-spacing: 0.06em;
}

.page-about .about-versions__content h2 {
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.3;
  margin: 0.8rem 0 1rem;
}

.page-about .about-versions__content > p {
  color: var(--color-text-muted, #A89F91);
  line-height: 1.85;
  max-width: 42rem;
  margin-bottom: 1.6rem;
}

.page-about .about-versions__tiers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  max-width: 42rem;
  margin-bottom: var(--space-lg, 2.5rem);
}

.page-about .about-versions__tier {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.1rem 1.2rem;
  background: var(--color-bg-graphite, #111722);
  border: 1px solid rgba(232, 196, 110, 0.08);
  border-top: 2px solid rgba(216, 145, 58, 0.5);
  transition: border-color 200ms var(--ease-out, cubic-bezier(0.2, 0.9, 0.3, 1.2)), background 200ms;
}

.page-about .about-versions__tier:hover {
  border-top-color: #E8C46E;
  background: rgba(17, 23, 34, 0.72);
}

.page-about .about-versions__tier-index {
  font-family: var(--font-mono, "Roboto Mono", monospace);
  font-size: 1.15rem;
  font-weight: 700;
  color: #D8913A;
  flex-shrink: 0;
}

.page-about .about-versions__tier h3 {
  font-size: 1.05rem;
  margin-bottom: 0.3rem;
}

.page-about .about-versions__tier p {
  color: var(--color-text-muted, #A89F91);
  font-size: 0.88rem;
  line-height: 1.65;
  margin: 0;
}

.page-about .about-versions__cta {
  display: inline-flex;
}

/* 团队区块 */
.page-about .about-team {
  padding: var(--space-2xl, 6.5rem) 0;
}

.page-about .about-team__head {
  margin-bottom: var(--space-xl, 4rem);
}

.page-about .about-team__head .page-head__title {
  font-size: clamp(1.45rem, 3.2vw, 2.2rem);
  line-height: 1.3;
  margin-bottom: 0.8rem;
}

.page-about .about-team__head .page-head__desc {
  max-width: 40rem;
  color: var(--color-text-muted, #A89F91);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
  margin-bottom: var(--space-xl, 4rem);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  padding: 1.5rem 1.2rem;
  background: linear-gradient(150deg, rgba(17, 23, 34, 0.9) 0%, rgba(26, 34, 48, 0.64) 100%);
  border: 1px solid rgba(232, 196, 110, 0.09);
  position: relative;
  overflow: hidden;
  transition: box-shadow 260ms var(--ease-out, cubic-bezier(0.2, 0.9, 0.3, 1.2)), transform 260ms var(--ease-out, cubic-bezier(0.2, 0.9, 0.3, 1.2));
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, #E8C46E 0%, #D8913A 100%);
  opacity: 0.6;
}

.page-about .about-role:hover {
  transform: translateY(-3px) rotate(-0.3deg);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(232, 196, 110, 0.1);
}

.page-about .about-role__icon {
  width: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(232, 196, 110, 0.32);
  background: radial-gradient(circle, rgba(232, 196, 110, 0.12) 0%, transparent 70%);
  color: #E8C46E;
  transition: transform 280ms var(--ease-out, cubic-bezier(0.2, 0.9, 0.3, 1.2));
}

.page-about .about-role:hover .about-role__icon {
  transform: rotate(8deg) scale(1.04);
}

.page-about .about-role__title {
  font-size: 1.18rem;
  margin-bottom: 0.2rem;
}

.page-about .about-role__desc {
  color: var(--color-text-muted, #A89F91);
  font-size: 0.9rem;
  line-height: 1.75;
  margin: 0;
}

.page-about .about-role__tag {
  display: inline-block;
  width: fit-content;
  padding: 0.26rem 0.6rem;
  font-family: var(--font-mono, "Roboto Mono", monospace);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(232, 196, 110, 0.9);
  background: rgba(107, 45, 92, 0.3);
  border: 1px solid rgba(107, 45, 92, 0.6);
}

.page-about .about-role--analyst .about-role__tag {
  background: rgba(216, 145, 58, 0.12);
  border-color: rgba(216, 145, 58, 0.3);
}

.page-about .about-role--support .about-role__tag {
  background: rgba(232, 196, 110, 0.08);
  border-color: rgba(232, 196, 110, 0.2);
}

.page-about .about-team__workspace {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg, 2.5rem);
  padding: var(--space-lg, 2.5rem) 0;
  border-top: 1px solid rgba(232, 196, 110, 0.08);
  border-bottom: 1px solid rgba(232, 196, 110, 0.08);
}

.page-about .about-team__workspace-img img {
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: cover;
  display: block;
  border: 1px solid rgba(232, 196, 110, 0.16);
  clip-path: polygon(2% 0, 100% 0, 98% 100%, 0 100%);
  filter: saturate(0.9) contrast(1.06);
}

.page-about .about-team__workspace-text h3 {
  font-size: 1.25rem;
  margin-bottom: 0.7rem;
}

.page-about .about-team__workspace-text p {
  color: var(--color-text-muted, #A89F91);
  line-height: 1.8;
  margin-bottom: 1.4rem;
  max-width: 42rem;
}

.page-about .about-team__workspace-text .btn {
  display: inline-flex;
}

/* 边界声明区块 */
.page-about .about-principle {
  padding-bottom: var(--space-2xl, 6.5rem);
}

.page-about .about-principle__banner {
  position: relative;
  overflow: hidden;
  padding: 2.2rem 1.6rem;
  background: linear-gradient(125deg, rgba(17, 23, 34, 0.92) 0%, rgba(26, 34, 48, 0.78) 60%, rgba(107, 45, 92, 0.5) 100%);
  border: 1px solid rgba(232, 196, 110, 0.14);
  clip-path: polygon(0 0, 100% 0, calc(100% - 6%) 100%, 2% 100%);
}

.page-about .about-principle__grid {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(232, 196, 110, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 196, 110, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

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

.page-about .about-principle__content h2 {
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
  margin-bottom: 0.7rem;
}

.page-about .about-principle__content p {
  color: var(--color-text-muted, #A89F91);
  line-height: 1.8;
  max-width: 42rem;
  margin: 0;
}

/* 通用过渡动画 */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 480ms var(--ease-out, cubic-bezier(0.2, 0.9, 0.3, 1.2)), transform 480ms var(--ease-out, cubic-bezier(0.2, 0.9, 0.3, 1.2));
}

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

/* 桌面端 */
@media (min-width: 768px) {
  .page-about .about-hero__inner {
    grid-template-columns: 0.95fr 1.05fr;
    align-items: center;
  }

  .page-about .about-mission__grid {
    grid-template-columns: 0.38fr 1.62fr;
    gap: 2.2rem;
  }

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

  .page-about .about-mission__fact {
    flex-direction: column;
    gap: 0.3rem;
  }

  .page-about .about-milestone {
    grid-template-columns: 1fr 1fr;
    column-gap: 3rem;
    margin-bottom: var(--space-md, 1.75rem);
  }

  .page-about .about-milestone__line {
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
  }

  .page-about .about-milestone__body {
    grid-column: 1 / 2;
  }

  .page-about .about-milestone__body--right {
    grid-column: 2 / 3;
  }

  .page-about .about-milestone:nth-child(even) .about-milestone__body {
    grid-column: 2 / 3;
  }

  .page-about .about-timeline__wrap {
    padding-left: 0;
  }

  .page-about .about-timeline__rail {
    left: 50%;
    transform: translateX(calc(-50% + var(--about-rail-w, 3px) / 2));
  }

  .page-about .about-versions__grid {
    grid-template-columns: 0.8fr 1.2fr;
    align-items: center;
  }

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

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.4rem;
  }

  .page-about .about-team__workspace {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
  }

  .page-about .about-principle__banner {
    padding: 3rem 3.4rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-versions__tiers {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-versions__tier {
    align-items: center;
  }
}

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

  .page-about .about-role,
  .page-about .about-milestone__body,
  .page-about .about-versions__tier {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-milestone__body:hover {
    transform: none;
  }
}