/* ============================================
   关于我们 · 页面专属样式
   作用域限定 .page-about
   ============================================ */
.page-about {
  --about-page-gap: clamp(64px, 8vw, 116px);
  --about-num-size: clamp(28px, 4vw, 40px);
  --about-line: rgba(0, 229, 255, 0.14);
  --about-line-strong: rgba(0, 229, 255, 0.34);
  background-color: var(--color-base, #0B1D3A);
  color: var(--color-text, #F2F7FC);
  overflow-x: hidden;
}

/* ---------- 01 首屏 Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h, 64px) + 40px) 0 56px;
  border-bottom: 1px solid var(--border-color, rgba(0, 229, 255, 0.16));
  background:
    linear-gradient(rgba(0, 229, 255, 0.042) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.042) 1px, transparent 1px),
    radial-gradient(circle at 82% 18%, rgba(0, 229, 255, 0.09), transparent 42%);
  background-size: 44px 44px, 44px 44px, 100% 100%;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 220px;
  height: 3px;
  background: var(--color-highlight, #FF7A00);
}

.page-about .about-hero__crumb {
  margin-bottom: 32px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.page-about .about-hero__main .mono-label {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 10px;
  color: var(--color-accent, #00E5FF);
  font-size: 13px;
  letter-spacing: 0.14em;
  border: 1px solid var(--about-line-strong);
  background: rgba(0, 229, 255, 0.06);
}

.page-about .about-hero__main h1 {
  margin: 0 0 20px;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--color-text, #F2F7FC);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 0 0 12px;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.85;
  color: var(--color-text, #F2F7FC);
}

.page-about .about-hero__hint {
  max-width: 54ch;
  margin: 0 0 28px;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-accent, #00E5FF);
  border-left: 2px solid var(--color-accent, #00E5FF);
}

.page-about .about-hero__toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding-top: 22px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__toc-title {
  color: var(--color-muted, #B8C7D9);
  font-size: 13px;
}

.page-about .about-hero__toc-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.page-about .about-hero__toc-links a {
  font-family: var(--font-mono, "JetBrains Mono"), monospace;
  font-size: 13px;
  color: var(--color-muted, #B8C7D9);
  text-decoration: none;
  letter-spacing: 0.02em;
  border-bottom: 1px solid transparent;
  transition: color var(--transition, 0.2s ease), border-color var(--transition, 0.2s ease);
}

.page-about .about-hero__toc-links a:hover,
.page-about .about-hero__toc-links a:focus-visible {
  color: var(--color-accent, #00E5FF);
  border-color: var(--color-accent, #00E5FF);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.page-about .about-hero__aside {
  min-width: 0;
}

.page-about .about-hero__panel {
  position: relative;
  padding: 24px 24px 20px;
  background: rgba(14, 39, 74, 0.72);
  border: 1px solid var(--about-line-strong);
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 3px;
  background: var(--color-highlight, #FF7A00);
}

.page-about .about-hero__panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.page-about .about-hero__panel-head .mono-label {
  color: var(--color-muted, #B8C7D9);
  font-size: 13px;
  letter-spacing: 0.2em;
}

.page-about .about-hero__list {
  margin: 18px 0 12px;
  padding: 0;
}

.page-about .about-hero__list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__list dt {
  font-size: 13px;
  color: var(--color-muted, #B8C7D9);
}

.page-about .about-hero__list dd {
  margin: 0;
  font-family: var(--font-display, "Archivo Black"), sans-serif;
  font-size: 20px;
  color: var(--color-accent, #00E5FF);
}

.page-about .about-hero__aside-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--color-muted, #B8C7D9);
}

/* ---------- 02 品牌使命 ---------- */
.page-about .about-mission {
  background-color: var(--color-base-deep, #0E274A);
}

.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  margin-top: 40px;
}

.page-about .about-mission__copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-text, #F2F7FC);
}

.page-about .about-mission__bullet {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 10px 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text, #F2F7FC);
}

.page-about .about-mission__bullet .mono-label {
  flex-shrink: 0;
  color: var(--color-accent, #00E5FF);
  font-size: 12px;
}

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

/* ---------- 03 发展历程 ---------- */
.page-about .about-journey {
  padding: var(--about-page-gap) 0;
}

.page-about .about-journey__hero {
  margin-top: 40px;
}

.page-about .about-timeline {
  position: relative;
  margin-top: 52px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 2px;
  bottom: 4px;
  left: 100px;
  width: 1px;
  background: linear-gradient(
    to bottom,
    var(--color-accent, #00E5FF),
    rgba(0, 229, 255, 0.25) 70%,
    transparent
  );
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 74px 18px 1fr;
  column-gap: 18px;
  padding-bottom: 48px;
}

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

.page-about .about-timeline__year {
  padding-top: 2px;
  font-family: var(--font-mono, "JetBrains Mono"), monospace;
  font-size: 16px;
  line-height: 1.4;
  color: var(--color-accent, #00E5FF);
  text-align: right;
}

.page-about .about-timeline__dot {
  width: 10px;
  height: 10px;
  margin-top: 10px;
  background: var(--color-accent, #00E5FF);
  justify-self: center;
  transform: rotate(45deg);
  box-shadow: 0 0 0 5px rgba(0, 229, 255, 0.1);
}

.page-about .about-timeline__card {
  min-width: 0;
  padding: 20px 22px;
  background: rgba(14, 39, 74, 0.58);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--color-accent, #00E5FF);
}

.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-family: var(--font-display, "Archivo Black"), sans-serif;
  font-size: 17px;
  line-height: 1.4;
  color: var(--color-text, #F2F7FC);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-muted, #B8C7D9);
}

/* ---------- 04 服务规模 ---------- */
.page-about .about-scale {
  background-color: var(--color-base-deep, #0E274A);
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  margin-top: 40px;
}

.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.page-about .about-scale__stat {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  min-height: 104px;
  padding: 20px 16px;
  background: rgba(11, 29, 58, 0.66);
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--color-accent, #00E5FF);
}

.page-about .about-scale__num {
  font-family: var(--font-display, "Archivo Black"), sans-serif;
  font-size: var(--about-num-size);
  line-height: 1.1;
  color: var(--color-accent, #00E5FF);
}

.page-about .about-scale__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-muted, #B8C7D9);
}

.page-about .about-scale__visual {
  min-width: 0;
}

.page-about .about-scale__visual .image-frame {
  margin-top: 0;
}

.page-about .about-scale__note {
  margin: 18px 0 0;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-muted, #B8C7D9);
  border-left: 2px solid var(--color-highlight, #FF7A00);
}

/* ---------- 05 技术承诺 ---------- */
.page-about .about-commit {
  padding: var(--about-page-gap) 0;
}

.page-about .about-commit__list {
  margin-top: 40px;
}

.page-about .about-commit__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  padding: 26px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-commit__item:first-of-type {
  border-top: 1px solid var(--about-line);
}

.page-about .about-commit__index {
  height: fit-content;
  margin-top: 2px;
  padding: 6px 10px;
  font-size: 14px;
  color: var(--color-highlight, #FF7A00);
  background: rgba(255, 122, 0, 0.06);
  border: 1px solid rgba(255, 122, 0, 0.32);
}

.page-about .about-commit__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display, "Archivo Black"), sans-serif;
  font-size: 17px;
  line-height: 1.4;
  color: var(--color-text, #F2F7FC);
}

.page-about .about-commit__item p {
  max-width: 60ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-muted, #B8C7D9);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  background-color: var(--color-base, #0B1D3A);
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: center;
}

.page-about .about-next__text .mono-label {
  color: var(--color-accent, #00E5FF);
  letter-spacing: 0.16em;
}

.page-about .about-next__text h2 {
  margin: 12px 0 12px;
  font-family: var(--font-display, "Archivo Black"), sans-serif;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.3;
  color: var(--color-text, #F2F7FC);
}

.page-about .about-next__text p {
  max-width: 56ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-muted, #B8C7D9);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 中等屏：平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-scale__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-timeline__item {
    grid-template-columns: 90px 20px 1fr;
    column-gap: 20px;
  }

  .page-about .about-timeline::before {
    left: 110px;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.45fr);
    gap: 56px;
  }

  .page-about .about-mission__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 60px;
    align-items: center;
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 48px;
  }

  .page-about .about-timeline::before {
    left: 134px;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 100px 20px 1fr;
    column-gap: 24px;
    padding-bottom: 56px;
  }

  .page-about .about-timeline__card {
    padding: 24px 28px;
  }
}