/* ===== 页面级变量 ===== */
.page-about {
  --about-soft-border: rgba(232, 237, 242, 0.18);
  --about-line-soft: rgba(11, 29, 58, 0.12);
  --about-muted-ink: #60708C;
  --about-amber-deep: #AA6D00;
  --about-card-white: #FFFFFF;
  max-width: 100%;
  overflow-x: clip;
  background: var(--c-primary);
}

/* ===== 品牌首屏 ===== */
.page-about .about-hero {
  padding: 48px 20px 64px;
  background:
    radial-gradient(1100px 420px at 85% -10%, rgba(57, 255, 20, 0.08) 0%, transparent 60%),
    linear-gradient(135deg, var(--c-primary) 0%, var(--c-surface-dark) 100%);
}

.page-about .about-hero__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  gap: 40px;
}

.page-about .about-hero__content {
  display: grid;
  justify-items: start;
  gap: 16px;
}

.page-about .about-hero .section-sub {
  color: var(--c-accent);
}

.page-about .about-hero__title {
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--c-text-light);
  margin: 0;
}

.page-about .about-hero__lead {
  max-width: 560px;
  color: var(--c-text-muted);
  font-size: 1.05rem;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

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

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius) + 4px);
  clip-path: polygon(0 0, 100% 0, 96% 100%, 4% 100%);
}

.page-about .about-hero__badge {
  position: absolute;
  display: grid;
  gap: 2px;
  background: rgba(7, 21, 38, 0.92);
  border: 1px solid rgba(57, 255, 20, 0.5);
  border-radius: 14px;
  padding: 10px 14px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
}

.page-about .about-hero__badge--top {
  top: 12px;
  right: 12px;
}

.page-about .about-hero__badge--bottom {
  bottom: 12px;
  left: 12px;
}

.page-about .about-hero__badge-num {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--c-accent);
  line-height: 1;
}

.page-about .about-hero__badge-label {
  font-size: 0.75rem;
  color: var(--c-text-muted);
}

/* ===== 品牌使命 ===== */
.page-about .about-mission {
  padding: 56px 20px 72px;
  background: var(--c-surface-dark);
}

.page-about .about-mission .container--narrow {
  text-align: center;
}

.page-about .about-mission .section-sub {
  color: var(--c-accent);
}

.page-about .about-mission__heading {
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: 0;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  transform: skewX(-2deg);
}

.page-about .about-mission__prose {
  margin-top: 24px;
  color: var(--c-text-muted);
}

.page-about .about-mission__prose p {
  max-width: 640px;
  margin-inline: auto;
}

.page-about .about-mission__prose a,
.page-about .about-choose__proof a {
  color: var(--c-accent2);
  font-weight: 700;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  padding: 72px 20px;
  background: var(--c-surface-light);
  color: var(--c-primary);
}

.page-about .about-milestones__header {
  max-width: 760px;
  margin: 0 auto 48px;
  text-align: center;
}

.page-about .about-milestones .section-sub {
  color: var(--c-accent2);
}

.page-about .about-milestones__intro {
  max-width: 560px;
  margin: 16px auto 0;
  color: var(--about-muted-ink);
}

.page-about .about-milestones__body {
  position: relative;
  max-width: 640px;
  margin-inline: auto;
  padding-left: 28px;
}

.page-about .about-milestones__body::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 24px;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-accent), var(--c-accent2));
}

.page-about .about-timeline {
  position: relative;
  min-width: 0;
}

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

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -28px;
  top: 10px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-accent2);
  border: 3px solid var(--c-surface-light);
}

.page-about .about-timeline__year {
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--about-amber-deep);
  margin-bottom: 10px;
}

.page-about .about-timeline__card {
  background: var(--about-card-white);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 10px 24px rgba(11, 29, 58, 0.06);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.page-about .about-timeline__card:hover {
  transform: translateY(-2px);
  border-color: var(--c-accent2);
  box-shadow: 0 16px 32px rgba(11, 29, 58, 0.1);
}

.page-about .about-timeline__card h3 {
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--c-primary);
  margin: 0 0 8px;
}

.page-about .about-timeline__card p {
  font-size: 0.95rem;
  color: var(--about-muted-ink);
  margin: 0;
}

.page-about .about-timeline__details {
  margin-top: 12px;
  border-top: 1px dashed var(--about-line-soft);
  padding-top: 12px;
}

.page-about .about-timeline__details summary {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  font-weight: 700;
  color: var(--c-accent2);
  font-size: 0.875rem;
  list-style: none;
}

.page-about .about-timeline__details summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline__details summary::before {
  content: "＋ ";
}

.page-about .about-timeline__details[open] summary::before {
  content: "－ ";
}

.page-about .about-timeline__details p {
  font-size: 0.95rem;
  color: var(--about-muted-ink);
  margin: 12px 0 0;
}

.page-about .about-milestones__art {
  margin: 40px 0 0;
}

.page-about .about-milestones__art img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 400px;
  margin-inline: auto;
  border-radius: var(--radius);
}

/* ===== 团队与能力 ===== */
.page-about .about-team {
  padding: 80px 20px;
  background: linear-gradient(145deg, var(--c-surface-dark) 0%, var(--c-primary) 100%);
}

.page-about .about-team__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  gap: 48px;
  align-items: center;
}

.page-about .about-team .section-sub {
  color: var(--c-accent);
}

.page-about .about-team__content {
  display: grid;
  gap: 20px;
}

.page-about .about-team__lede {
  max-width: 520px;
  color: var(--c-text-muted);
  margin: 0;
}

.page-about .about-team__matrix {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .about-team__cell {
  background: rgba(19, 42, 84, 0.5);
  border: 1px solid var(--about-soft-border);
  border-radius: var(--radius);
  padding: 16px;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-team__cell:hover {
  border-color: rgba(57, 255, 20, 0.4);
  background: rgba(19, 42, 84, 0.72);
}

.page-about .about-team__cell-label {
  display: block;
  font-weight: 900;
  color: var(--c-text-light);
  margin-bottom: 4px;
}

.page-about .about-team__cell-desc {
  display: block;
  font-size: 0.85rem;
  color: var(--c-text-muted);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

/* ===== 为什么选择我们 ===== */
.page-about .about-choose {
  padding: 80px 20px;
  background: var(--c-surface-light);
  color: var(--c-primary);
}

.page-about .about-choose .section-sub {
  color: var(--c-accent2);
}

.page-about .about-choose__grid {
  display: grid;
  gap: 16px;
  margin-top: 40px;
}

.page-about .about-choose__item {
  position: relative;
  background: var(--about-card-white);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius);
  padding: 24px 24px 24px 76px;
  box-shadow: 0 14px 28px rgba(11, 29, 58, 0.06);
}

.page-about .about-choose__index {
  position: absolute;
  left: 20px;
  top: 20px;
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1;
  color: var(--c-accent2);
}

.page-about .about-choose__item h3 {
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--c-primary);
  margin: 0 0 6px;
}

.page-about .about-choose__item p {
  font-size: 0.95rem;
  color: var(--about-muted-ink);
  margin: 0;
}

.page-about .about-choose__proof {
  max-width: 720px;
  margin: 32px auto 0;
  padding: 20px 24px;
  background: rgba(11, 29, 58, 0.04);
  border-left: 4px solid var(--c-accent2);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--about-muted-ink);
  font-size: 0.95rem;
}

/* ===== 联系与反馈 ===== */
.page-about .about-contact {
  padding: 80px 20px;
  background:
    radial-gradient(1000px 300px at 100% 0%, rgba(255, 107, 0, 0.06) 0%, transparent 60%),
    linear-gradient(180deg, var(--c-primary), var(--c-surface-dark));
}

.page-about .about-contact .container--narrow {
  text-align: center;
}

.page-about .about-contact .section-sub {
  color: var(--c-accent);
}

.page-about .about-contact__copy {
  max-width: 560px;
  margin: 16px auto 0;
  color: var(--c-text-muted);
}

.page-about .about-contact__copy--small {
  font-size: 0.85rem;
  opacity: 0.82;
}

.page-about .about-contact__email {
  color: var(--c-accent);
  font-weight: 700;
  word-break: break-all;
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 64px 24px 80px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 1.05fr 0.85fr;
    align-items: center;
    gap: 56px;
    min-height: 540px;
  }

  .page-about .about-hero__title {
    font-size: clamp(2.8rem, 6vw, 4.6rem);
  }

  .page-about .about-mission {
    padding: 96px 24px;
  }

  .page-about .about-milestones {
    padding: 96px 24px;
  }

  .page-about .about-milestones__header {
    margin-bottom: 64px;
  }

  .page-about .about-milestones__body {
    max-width: var(--container-max);
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: center;
    gap: 64px;
    padding-left: 0;
  }

  .page-about .about-milestones__body::before {
    display: none;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 64px;
    align-items: start;
    padding-bottom: 48px;
  }

  .page-about .about-timeline__item::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--about-line-soft);
    transform: translateX(-50%);
  }

  .page-about .about-timeline__item:last-child::before {
    bottom: auto;
    height: 24px;
  }

  .page-about .about-timeline__year {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
    font-size: clamp(3rem, 6vw, 4.4rem);
    margin-bottom: 0;
    align-self: start;
  }

  .page-about .about-timeline__card {
    grid-column: 2;
    grid-row: 1;
    margin-top: -8px;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__year {
    grid-column: 2;
    text-align: left;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__card {
    grid-column: 1;
  }

  .page-about .about-timeline__dot {
    left: 50%;
    top: 12px;
    transform: translateX(-50%);
    background: var(--c-accent);
    border-color: var(--c-surface-light);
  }

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

  .page-about .about-milestones__art img {
    width: 100%;
    max-width: 320px;
    height: auto;
    margin-inline: auto;
  }

  .page-about .about-team {
    padding: 96px 24px;
  }

  .page-about .about-team__inner {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 72px;
  }

  .page-about .about-choose {
    padding: 96px 24px;
  }

  .page-about .about-choose__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .page-about .about-contact {
    padding: 96px 24px;
  }
}

/* ===== 动效强化 / 减弱动效适配 ===== */
@media (prefers-reduced-motion: no-preference) {
  .page-about .about-hero__badge-num {
    animation: about-num-glow 3s ease-in-out infinite;
  }
}

@keyframes about-num-glow {
  0%,
  100% {
    text-shadow: 0 0 12px rgba(57, 255, 20, 0.35);
  }
  50% {
    text-shadow: 0 0 24px rgba(57, 255, 20, 0.72);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__card,
  .page-about .about-team__cell {
    transition: none;
  }
}