.page-about {
  --about-cream: #F5F1E6;
  --about-paper: #FCF9F2;
  --about-ink: #1A120C;
  --about-navy: #0B1D3A;
  --about-blue: #16305C;
  --about-blue-light: #1E3A6E;
  --about-red: #E4572E;
  --about-orange: #FF6B00;
  --about-green: #39FF14;
  --about-muted: #6B7280;
  --about-serif: "Songti SC", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --about-mono: "IBM Plex Mono", "Roboto Mono", "Courier New", "PingFang SC", "Microsoft YaHei", monospace;
  --about-gap: clamp(20px, 3vw, 36px);

  background: var(--about-cream);
  color: var(--about-ink);
  font-family: var(--about-mono);
}

/* ===== 共用区块头 ===== */
.page-about .about-section-head {
  margin-bottom: 36px;
}
.page-about .about-section-head h2 {
  font-family: var(--about-serif);
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.3;
  margin: 16px 0 10px;
  letter-spacing: .01em;
}
.page-about .about-section-head p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-muted);
  max-width: 640px;
  margin: 0;
}

/* ===== 标签适配 ===== */
.page-about .ky-tag {
  border-color: var(--about-red);
  color: var(--about-red);
  background: transparent;
}

/* ===== 面包屑 ===== */
.page-about .ky-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--about-muted);
  margin-bottom: 18px;
}
.page-about .ky-breadcrumb a {
  color: inherit;
  text-decoration: none;
  transition: color var(--ky-transition);
}
.page-about .ky-breadcrumb a:hover {
  color: var(--about-red);
}
.page-about .ky-breadcrumb__sep {
  color: var(--about-red);
}

/* ===== Hero ===== */
.page-about .about-hero {
  padding: calc(var(--ky-header-h) + 28px) var(--ky-gutter) 32px;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 55px,
      rgba(26, 18, 12, .045) 55px,
      rgba(26, 18, 12, .045) 56px
    ),
    var(--about-cream);
}
.page-about .about-hero__inner {
  max-width: var(--ky-contain-max);
  margin: 0 auto;
  padding: 22px 0 12px;
  border-top: 4px solid var(--about-ink);
  border-bottom: 1px solid rgba(26, 18, 12, .22);
  position: relative;
}
.page-about .about-hero__inner::after {
  content: "持续迭代 · KAIYUN";
  position: absolute;
  top: -13px;
  right: 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--about-red);
  background: var(--about-cream);
  padding: 0 8px;
  white-space: nowrap;
}
.page-about .about-hero__kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--about-red);
  border-bottom: 2px solid var(--about-red);
  padding-bottom: 4px;
  text-transform: uppercase;
}
.page-about .about-hero h1 {
  font-family: var(--about-serif);
  font-size: clamp(28px, 5.2vw, 48px);
  line-height: 1.15;
  margin: 18px 0 16px;
  letter-spacing: .01em;
}
.page-about .about-hero__lead {
  max-width: 720px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-muted);
  border-left: 3px solid var(--about-red);
  padding-left: 14px;
  margin: 0;
}

/* ===== 品牌使命 ===== */
.page-about .about-mission {
  position: relative;
  padding: 56px var(--ky-gutter) 64px;
  background: linear-gradient(180deg, var(--about-cream) 0%, var(--about-paper) 100%);
}
.page-about .about-mission > .ky-container {
  position: relative;
  z-index: 1;
}
.page-about .about-mission__grid {
  display: grid;
  gap: 36px;
  max-width: var(--ky-contain-max);
  margin: 0 auto;
  align-items: center;
}
.page-about .about-mission h2 {
  font-family: var(--about-serif);
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.3;
  margin: 20px 0 16px;
}
.page-about .about-mission p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-muted);
  margin: 0 0 20px;
}
.page-about .about-mission__points {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}
.page-about .about-mission__point {
  border: 1px solid rgba(26, 18, 12, .16);
  background: var(--about-paper);
  padding: 14px 16px;
  box-shadow: 3px 3px 0 rgba(26, 18, 12, .05);
  transition: transform var(--ky-transition), box-shadow var(--ky-transition);
}
.page-about .about-mission__point:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(26, 18, 12, .08);
}
.page-about .about-mission__point-num {
  display: block;
  font-family: var(--about-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--about-red);
  margin-bottom: 4px;
}
.page-about .about-mission__point h3 {
  font-family: var(--about-serif);
  font-size: 17px;
  margin: 0 0 6px;
}
.page-about .about-mission__point p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-muted);
  margin: 0;
}
.page-about .about-mission__figure {
  margin: 0;
  position: relative;
}
.page-about .about-mission__figure::before {
  content: "";
  position: absolute;
  inset: 12px -10px -10px 12px;
  background: rgba(26, 18, 12, .05);
  border: 1px solid rgba(26, 18, 12, .1);
  z-index: 0;
}
.page-about .about-mission__figure img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  background: var(--about-paper);
  border: 2px solid var(--about-ink);
  padding: 6px;
}
.page-about .about-mission__figure figcaption {
  position: relative;
  z-index: 1;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--about-muted);
  margin-top: 10px;
  text-transform: uppercase;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  padding: 64px var(--ky-gutter) 72px;
  background: var(--about-paper);
  border-top: 1px solid rgba(26, 18, 12, .1);
  border-bottom: 1px solid rgba(26, 18, 12, .12);
}
.page-about .about-milestones > .ky-container {
  max-width: var(--ky-contain-max);
  margin: 0 auto;
}
.page-about .about-milestones__figure {
  margin: 0 0 44px;
  border: 1px solid rgba(26, 18, 12, .16);
  background: var(--about-cream);
  padding: 10px;
  box-shadow: 4px 4px 0 rgba(26, 18, 12, .06);
}
.page-about .about-milestones__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.page-about .about-milestones__figure figcaption {
  font-size: 12px;
  color: var(--about-muted);
  letter-spacing: .08em;
  margin-top: 8px;
}

/* 时间线主体 */
.page-about .about-milestones__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-milestones__list::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: repeating-linear-gradient(
    180deg,
    var(--about-red) 0,
    var(--about-red) 6px,
    transparent 6px,
    transparent 12px
  );
  opacity: .7;
}
.page-about .about-milestones__item {
  position: relative;
  padding-left: 38px;
  margin-bottom: 26px;
}
.page-about .about-milestones__item:last-child {
  margin-bottom: 0;
}
.page-about .about-milestones__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 24px;
  width: 10px;
  height: 10px;
  background: var(--about-red);
  border-radius: 50%;
  transform: translateY(-50%);
  box-shadow: 0 0 0 4px var(--about-paper), 0 0 0 6px rgba(228, 87, 46, .35);
}
.page-about .about-milestones__card {
  background: var(--about-cream);
  border: 1px solid rgba(26, 18, 12, .16);
  border-left: 3px solid var(--about-red);
  padding: 16px 18px 18px;
  box-shadow: 3px 3px 0 rgba(26, 18, 12, .05);
  transition: transform var(--ky-transition), box-shadow var(--ky-transition);
}
.page-about .about-milestones__card:hover,
.page-about .about-milestones__card:focus-visible {
  transform: translate(-3px, -2px);
  box-shadow: 8px 8px 0 rgba(26, 18, 12, .1);
  outline: none;
}
.page-about .about-milestones__card:focus-visible {
  outline: 3px solid var(--about-green);
  outline-offset: 2px;
}
.page-about .about-milestones__version {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--about-red);
  background: rgba(228, 87, 46, .1);
  padding: 3px 12px;
  margin-bottom: 8px;
  border-radius: 2px;
}
.page-about .about-milestones__card h3 {
  font-family: var(--about-serif);
  font-size: 20px;
  line-height: 1.3;
  margin: 0 0 8px;
}
.page-about .about-milestones__card p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-muted);
  margin: 0;
}

/* ===== 服务规模 ===== */
.page-about .about-scale {
  background:
    linear-gradient(135deg, rgba(22, 48, 92, .55) 0%, rgba(11, 29, 58, .1) 100%),
    var(--about-navy);
  color: var(--about-cream);
  padding: 72px var(--ky-gutter);
  position: relative;
  overflow: hidden;
}
.page-about .about-scale::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--about-red), var(--about-orange), var(--about-green), var(--about-red));
  background-size: 200% 100%;
}
.page-about .about-scale > .ky-container {
  max-width: var(--ky-contain-max);
  margin: 0 auto;
}
.page-about .about-scale__grid {
  display: grid;
  gap: 44px;
  align-items: center;
}
.page-about .about-scale .ky-tag {
  border-color: var(--about-green);
  color: var(--about-green);
}
.page-about .about-scale h2 {
  font-family: var(--about-serif);
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.3;
  color: var(--about-cream);
  margin: 16px 0 10px;
}
.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 28px 0 22px;
}
.page-about .about-scale__stat {
  border: 1px solid rgba(245, 241, 230, .24);
  background: rgba(245, 241, 230, .05);
  padding: 16px 14px;
  transition: background var(--ky-transition), transform var(--ky-transition);
}
.page-about .about-scale__stat:hover {
  background: rgba(245, 241, 230, .1);
  transform: translateY(-2px);
}
.page-about .about-scale__num {
  display: block;
  font-family: var(--about-serif);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--about-green);
  margin-bottom: 6px;
}
.page-about .about-scale__label {
  display: block;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: rgba(245, 241, 230, .78);
}
.page-about .about-scale__content p {
  font-size: 14px;
  line-height: 1.85;
  color: rgba(245, 241, 230, .82);
  margin: 0;
}
.page-about .about-scale__figure {
  margin: 0;
}
.page-about .about-scale__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border: 1px solid rgba(245, 241, 230, .22);
  background: rgba(245, 241, 230, .04);
}
.page-about .about-scale__figure figcaption {
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(245, 241, 230, .6);
  margin-top: 10px;
}

/* ===== 资质与认证 ===== */
.page-about .about-credentials {
  padding: 72px var(--ky-gutter);
  background:
    repeating-linear-gradient(
      0deg,
      transparent 0,
      transparent 31px,
      rgba(26, 18, 12, .035) 31px,
      rgba(26, 18, 12, .035) 32px
    ),
    var(--about-cream);
}
.page-about .about-credentials > .ky-container {
  max-width: var(--ky-contain-max);
  margin: 0 auto;
}
.page-about .about-credentials__grid {
  display: grid;
  gap: 22px;
}
.page-about .about-credentials__card {
  position: relative;
  background: var(--about-paper);
  border: 1px solid var(--about-ink);
  padding: 30px 22px 24px;
  box-shadow: 5px 5px 0 rgba(26, 18, 12, .08);
}
.page-about .about-credentials__card::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(26, 18, 12, .28);
  pointer-events: none;
}
.page-about .about-credentials__seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 2px solid var(--about-red);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--about-red);
  margin-bottom: 16px;
  background: rgba(228, 87, 46, .06);
}
.page-about .about-credentials__card h3 {
  font-family: var(--about-serif);
  font-size: 20px;
  line-height: 1.35;
  margin: 0 0 12px;
  padding-top: 10px;
  border-top: 2px solid var(--about-red);
}
.page-about .about-credentials__card p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--about-muted);
  margin: 0;
}

/* ===== 团队与组织 ===== */
.page-about .about-team {
  padding: 72px var(--ky-gutter) 80px;
  background: var(--about-paper);
  border-top: 1px solid rgba(26, 18, 12, .1);
}
.page-about .about-team > .ky-container {
  max-width: var(--ky-contain-max);
  margin: 0 auto;
}
.page-about .about-team__grid {
  display: grid;
  gap: 20px;
}
.page-about .about-team__card {
  background: var(--about-cream);
  border: 1px solid rgba(26, 18, 12, .18);
  padding: 26px 22px 30px;
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform var(--ky-transition), box-shadow var(--ky-transition);
}
.page-about .about-team__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(26, 18, 12, .1);
}
.page-about .about-team__no {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--about-red);
  margin-bottom: 12px;
}
.page-about .about-team__card h3 {
  font-family: var(--about-serif);
  font-size: 22px;
  margin: 0 0 10px;
}
.page-about .about-team__card p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-muted);
  margin: 0;
}

/* ===== 延伸阅读 ===== */
.page-about .about-outro {
  padding: 28px var(--ky-gutter) 56px;
  background: var(--about-cream);
}
.page-about .about-outro__inner {
  max-width: var(--ky-contain-max);
  margin: 0 auto;
  border-top: 1px solid rgba(26, 18, 12, .2);
  padding-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  color: var(--about-muted);
}
.page-about .about-outro p {
  margin: 0;
  line-height: 1.7;
}
.page-about .about-outro a {
  color: var(--about-red);
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color var(--ky-transition);
}
.page-about .about-outro a:hover {
  color: var(--about-ink);
}
.page-about .about-outro__home {
  font-size: 13px;
  letter-spacing: .08em;
  white-space: nowrap;
}

/* ===== 桌面端布局 ===== */
@media (min-width: 700px) {
  .page-about .about-mission__points {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .page-about .about-credentials__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-bottom: 56px;
  }
  .page-about .about-hero h1 {
    max-width: 820px;
  }
  .page-about .about-hero__lead {
    font-size: 16px;
    max-width: 760px;
  }

  .page-about .about-mission {
    padding: 72px var(--ky-gutter) 84px;
  }
  .page-about .about-mission__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
  }

  .page-about .about-milestones {
    padding: 76px var(--ky-gutter) 88px;
  }

  /* 中央时间线 */
  .page-about .about-milestones__list::before {
    left: 50%;
    transform: translateX(-50%);
  }
  .page-about .about-milestones__item {
    width: 50%;
    padding-left: 0;
    padding-right: 48px;
    margin-bottom: 30px;
  }
  .page-about .about-milestones__item::before {
    left: auto;
    right: -6px;
    transform: translateY(-50%);
    box-shadow: 0 0 0 4px var(--about-paper), 0 0 0 7px rgba(228, 87, 46, .3);
  }
  .page-about .about-milestones__item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 48px;
  }
  .page-about .about-milestones__item:nth-child(even)::before {
    right: auto;
    left: -6px;
  }
  .page-about .about-milestones__item:nth-child(odd) .about-milestones__card {
    text-align: right;
    border-left: 1px solid rgba(26, 18, 12, .16);
    border-right: 3px solid var(--about-red);
  }
  .page-about .about-milestones__item:nth-child(odd) .about-milestones__version {
    margin-left: auto;
  }

  .page-about .about-scale {
    padding: 88px var(--ky-gutter);
  }
  .page-about .about-scale__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
  }

  .page-about .about-credentials {
    padding: 84px var(--ky-gutter);
  }
  .page-about .about-credentials__grid {
    gap: 24px;
  }

  .page-about .about-team {
    padding: 84px var(--ky-gutter) 96px;
  }

  .page-about .about-outro {
    padding: 32px var(--ky-gutter) 72px;
  }
}