.page-about {
  --about-clip-red: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  --about-speed-line-dark: repeating-linear-gradient(135deg, rgba(246, 239, 228, 0.05) 0 2px, transparent 2px 14px);
  --about-speed-line-light: repeating-linear-gradient(135deg, rgba(22, 22, 22, 0.035) 0 2px, transparent 2px 14px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: 24px;
  padding-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.03em;
}

.page-about .breadcrumb a {
  color: var(--fire-red);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--fire-red);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--ink-dark);
  font-weight: 600;
}

/* ===== 首屏：我们是谁 ===== */
.page-about .about-hero {
  position: relative;
  background: var(--deep-black);
  color: var(--bg-cream);
  padding: 40px 0 76px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), 0 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-speed-line-dark);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  margin-bottom: 18px;
  background: transparent;
  color: var(--gold);
  border-color: rgba(240, 184, 76, 0.6);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(34px, 8vw, 58px);
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--bg-cream);
}

.page-about .about-hero__title span {
  display: block;
  color: var(--fire-red);
  margin-top: 4px;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(246, 239, 228, 0.92);
}

.page-about .about-hero__desc {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(246, 239, 228, 0.68);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 28px 0 0;
}

.page-about .about-hero__stat {
  background: rgba(255, 255, 255, 0.06);
  border-left: 3px solid var(--gold);
  padding: 14px 12px;
}

.page-about .about-hero__stat-label {
  font-size: 12px;
  line-height: 1.5;
  color: rgba(246, 239, 228, 0.6);
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.page-about .about-hero__stat-num {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 700;
  color: var(--gold);
  line-height: 1.2;
}

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

.page-about .about-hero .btn--primary {
  background: var(--fire-red);
  border-color: var(--fire-red);
  color: #ffffff;
}

.page-about .about-hero .btn--ghost {
  border-color: rgba(246, 239, 228, 0.55);
  color: var(--bg-cream);
}

.page-about .about-hero .btn--ghost:hover {
  border-color: var(--gold);
  color: var(--gold);
}

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

.page-about .about-hero__media-tag {
  position: absolute;
  right: 14px;
  top: 14px;
  z-index: 2;
  background: var(--gold);
  color: var(--deep-black);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 7px 12px;
  clip-path: var(--about-clip-red);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(4% 0, 100% 0, 100% 92%, 0 100%);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  padding: 72px 0 64px;
  background: var(--bg-cream);
}

.page-about .about-milestones__header {
  max-width: 680px;
  margin-bottom: 44px;
}

.page-about .about-milestones__kicker,
.page-about .about-tech__kicker,
.page-about .about-team__kicker,
.page-about .about-credentials__kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--fire-red);
  text-transform: uppercase;
}

.page-about .about-milestones__kicker::before,
.page-about .about-tech__kicker::before,
.page-about .about-team__kicker::before,
.page-about .about-credentials__kicker::before {
  content: "";
  width: 22px;
  height: 3px;
  background: var(--gold);
  clip-path: polygon(0 0, 100% 0, 80% 100%, 0 100%);
}

.page-about .about-milestones__title,
.page-about .about-tech__title,
.page-about .about-team__title,
.page-about .about-credentials__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(26px, 4.5vw, 38px);
  line-height: 1.3;
  color: var(--ink-dark);
}

.page-about .about-milestones__intro {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-gray);
}

.page-about .about-milestones__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-milestones__timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 12px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--fire-red), var(--gold) 60%, var(--warm-orange) 100%);
  opacity: 0.6;
}

.page-about .about-milestones__item {
  position: relative;
  padding: 0 0 42px 42px;
}

.page-about .about-milestones__item::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  width: 13px;
  height: 13px;
  background: var(--gold);
  border: 3px solid var(--bg-cream);
  transform: rotate(45deg);
}

.page-about .about-milestones__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .about-milestones__stamp {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 5px 12px;
  background: var(--fire-red);
  color: var(--bg-cream);
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  clip-path: polygon(7px 0, 100% 0, calc(100% - 7px) 100%, 0 100%);
}

.page-about .about-milestones__trait {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--fire-red);
}

.page-about .about-milestones__card {
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(46, 38, 32, 0.1);
  border-left: 4px solid var(--fire-red);
  border-radius: 3px;
  padding: 20px 22px;
  box-shadow: 0 1px 0 rgba(46, 38, 32, 0.04);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-milestones__card:hover {
  transform: translateY(-3px);
  border-left-color: var(--gold);
  box-shadow: 8px 8px 0 rgba(226, 58, 46, 0.14);
}

.page-about .about-milestones__card-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink-dark);
}

.page-about .about-milestones__card-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #5d5348;
}

/* ===== 技术实力 ===== */
.page-about .about-tech {
  position: relative;
  background: var(--deep-black);
  color: var(--bg-cream);
  padding: 72px 0 80px;
  clip-path: polygon(0 24px, 100% 0, 100% calc(100% - 24px), 0 100%);
}

.page-about .about-tech::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-speed-line-dark);
  pointer-events: none;
}

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

.page-about .about-tech__header {
  max-width: 720px;
}

.page-about .about-tech__kicker {
  color: var(--gold);
}

.page-about .about-tech__title {
  color: var(--bg-cream);
}

.page-about .about-tech__desc {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(246, 239, 228, 0.72);
}

.page-about .about-tech__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 36px;
}

.page-about .about-tech__card {
  background: var(--glass-black);
  border: 1px solid rgba(240, 184, 76, 0.35);
  padding: 22px 18px;
  clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  transition: background 0.25s ease, transform 0.25s ease;
}

.page-about .about-tech__card:hover {
  background: rgba(22, 22, 22, 0.82);
  transform: translateY(-3px);
}

.page-about .about-tech__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-tech__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: rgba(246, 239, 228, 0.78);
}

.page-about .about-tech__note {
  max-width: 780px;
  margin: 32px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--warm-orange);
  font-size: 14px;
  line-height: 1.9;
  color: rgba(246, 239, 228, 0.72);
}

.page-about .about-tech__note a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.page-about .about-tech__note a:hover {
  color: var(--warm-orange);
}

/* ===== 团队与组织 ===== */
.page-about .about-team {
  background: var(--bg-cream);
  padding: 72px 0 80px;
  position: relative;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-speed-line-light);
  pointer-events: none;
}

.page-about .about-team .content-container {
  position: relative;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-team__kicker {
  color: var(--fire-red);
}

.page-about .about-team__title {
  margin-bottom: 16px;
}

.page-about .about-team__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #4f463c;
}

.page-about .about-team__btn {
  margin-top: 20px;
}

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

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(0 6%, 100% 0, 96% 94%, 0 100%);
}

.page-about .about-team__figcaption,
.page-about .about-credentials__figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted-gray);
}

.page-about .about-team__numbers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 36px;
}

.page-about .about-team__stat {
  background: rgba(255, 255, 255, 0.78);
  border-top: 3px solid var(--fire-red);
  padding: 16px 14px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-team__stat:hover {
  border-top-color: var(--gold);
  background: rgba(255, 255, 255, 0.95);
}

.page-about .about-team__stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink-dark);
}

.page-about .about-team__stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted-gray);
}

/* ===== 资质与认可 ===== */
.page-about .about-credentials {
  background: linear-gradient(160deg, var(--bg-cream) 0%, #f7e9d7 100%);
  padding: 72px 0 80px;
}

.page-about .about-credentials__desc {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: #5d5348;
}

.page-about .about-credentials__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 36px;
}

.page-about .about-credentials__card {
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(240, 184, 76, 0.55);
  border-radius: 4px;
  padding: 22px 20px;
  position: relative;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.page-about .about-credentials__card:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 8px 8px 0 rgba(226, 58, 46, 0.12);
}

.page-about .about-credentials__year {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 5px 12px;
  margin-bottom: 14px;
  background: rgba(226, 58, 46, 0.12);
  color: var(--fire-red);
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

.page-about .about-credentials__card-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink-dark);
}

.page-about .about-credentials__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #5d5348;
}

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

.page-about .about-credentials__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  min-height: 180px;
  clip-path: polygon(8% 0, 100% 0, 92% 100%, 0 100%);
}

.page-about .about-credentials__media-note {
  margin: 26px 0 0;
  padding-left: 12px;
  border-left: 3px solid var(--gold);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-gray);
}

/* ===== 服务理念 ===== */
.page-about .about-vision {
  position: relative;
  background: var(--deep-black);
  color: var(--bg-cream);
  padding: 76px 0;
  clip-path: polygon(0 20px, 100% 0, 100% 100%, 0 calc(100% - 20px));
}

.page-about .about-vision::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-speed-line-dark);
  pointer-events: none;
}

.page-about .about-vision__inner {
  position: relative;
  text-align: center;
}

.page-about .about-vision__label {
  display: inline-block;
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border-bottom: 2px solid var(--fire-red);
  padding-bottom: 6px;
  margin: 0;
}

.page-about .about-vision__title {
  margin: 18px 0 16px;
  font-family: var(--font-head);
  font-size: clamp(30px, 6vw, 46px);
  line-height: 1.2;
  color: var(--bg-cream);
}

.page-about .about-vision__desc {
  max-width: 640px;
  margin: 0 auto;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(246, 239, 228, 0.8);
}

.page-about .about-vision__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-vision .btn--ghost {
  border-color: rgba(246, 239, 228, 0.5);
  color: var(--bg-cream);
}

.page-about .about-vision .btn--ghost:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 600px) {
  .page-about .about-tech__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-team__numbers {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-credentials__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 64px 0 110px;
  }

  .page-about .about-hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-hero__title {
    font-size: clamp(42px, 5vw, 62px);
  }

  .page-about .about-hero__lead {
    font-size: 18px;
  }

  .page-about .about-hero__desc {
    font-size: 15px;
  }

  .page-about .about-hero__media {
    transform: translateY(10px);
  }

  .page-about .about-milestones {
    padding: 88px 0 80px;
  }

  .page-about .about-milestones__timeline::before {
    left: 50%;
    transform: translateX(-1.5px);
  }

  .page-about .about-milestones__item {
    width: 50%;
    padding: 0 46px 56px 0;
  }

  .page-about .about-milestones__item::after {
    left: auto;
    right: -8px;
    top: 18px;
  }

  .page-about .about-milestones__item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 56px 46px;
  }

  .page-about .about-milestones__item:nth-child(even)::after {
    right: auto;
    left: -8px;
  }

  .page-about .about-milestones__item:nth-child(odd) .about-milestones__card {
    text-align: right;
  }

  .page-about .about-milestones__item:nth-child(odd) .about-milestones__meta {
    flex-direction: row-reverse;
    justify-content: flex-end;
  }

  .page-about .about-milestones__item:nth-child(odd) .about-milestones__stamp {
    margin-left: 10px;
  }

  .page-about .about-tech {
    padding: 88px 0 96px;
  }

  .page-about .about-tech__grid {
    margin-top: 44px;
  }

  .page-about .about-team {
    padding: 88px 0 96px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 60px;
  }

  .page-about .about-team__numbers {
    margin-top: 52px;
  }

  .page-about .about-credentials {
    padding: 88px 0 96px;
  }

  .page-about .about-credentials__grid {
    grid-template-columns: repeat(3, 1fr) minmax(200px, 0.9fr);
    gap: 18px;
    margin-top: 44px;
  }

  .page-about .about-credentials__media img {
    height: 100%;
    min-height: 220px;
  }

  .page-about .about-vision {
    padding: 96px 0;
  }
}