/* ==========================================================
   页面：品牌介绍（about）
   全部选择器限定在 .page-about 作用域内，移动端优先
   ========================================================== */
.page-about {
  --about-ring-size: 108px;
  overflow-x: clip;
  background-color: var(--bg-deep);
  background-image:
    linear-gradient(rgba(34, 48, 84, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 48, 84, 0.12) 1px, transparent 1px);
  background-size: 44px 44px;
}

/* ---------- 首屏 HERO ---------- */
.page-about .about-hero {
  position: relative;
  padding: 36px 20px 72px;
  border-bottom: 1px solid var(--divider);
  background:
    radial-gradient(720px 300px at 90% -10%, rgba(185, 103, 255, 0.16), transparent 65%),
    radial-gradient(560px 260px at 0% 110%, rgba(57, 255, 136, 0.07), transparent 60%);
}

.page-about .about-hero__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-hero__content {
  margin-top: 28px;
}

.page-about .about-hero__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-hero__index {
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--text-sub);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(2rem, 5.4vw, 3.8rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--purple);
}

.page-about .about-hero__lead {
  margin: 0 0 24px;
  max-width: 720px;
  font-family: var(--font-body);
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--text-sub);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__tags li {
  position: relative;
  padding-left: 16px;
  font-family: var(--font-data);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--text-main);
}

.page-about .about-hero__tags li::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--green);
  transform: translateY(-50%);
}

.page-about .about-hero__chapters {
  display: grid;
  gap: 8px;
  max-width: 520px;
}

.page-about .about-hero__chapters a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  border: 1px solid var(--divider);
  border-left: 3px solid transparent;
  background: rgba(17, 26, 48, 0.72);
  color: var(--text-main);
  text-decoration: none;
  font-family: var(--font-head);
  font-size: 0.92rem;
  font-weight: 600;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-about .about-hero__chapters a span {
  font-family: var(--font-data);
  font-size: 0.76rem;
  color: var(--green);
}

.page-about .about-hero__chapters a:hover {
  border-left-color: var(--purple);
  background: var(--bg-card);
  transform: translateX(4px);
}

/* ---------- 章节通用骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: 68px 20px;
  border-bottom: 1px solid var(--divider);
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-about .about-chapter--origin {
  --chapter-accent: var(--green);
  background: radial-gradient(600px 260px at 0% 0%, rgba(57, 255, 136, 0.05), transparent 60%);
}

.page-about .about-chapter--tech {
  --chapter-accent: var(--purple);
  background:
    radial-gradient(720px 300px at 100% 0%, rgba(185, 103, 255, 0.07), transparent 60%),
    radial-gradient(400px 200px at 0% 100%, rgba(57, 255, 136, 0.03), transparent 55%);
}

.page-about .about-chapter--milestones {
  --chapter-accent: var(--gold);
  background: radial-gradient(560px 240px at 50% 100%, rgba(255, 211, 110, 0.05), transparent 60%);
}

.page-about .about-chapter--team {
  --chapter-accent: var(--green);
}

.page-about .about-chapter__container {
  position: relative;
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: 26px;
}

.page-about .about-chapter__container::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 0;
  width: 1px;
  background: var(--chapter-accent, var(--divider));
  opacity: 0.4;
}

.page-about .about-chapter__container::after {
  content: "";
  position: absolute;
  top: 6px;
  left: -5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--chapter-accent, var(--purple));
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 28px;
}

.page-about .about-chapter__num {
  display: block;
  flex: none;
  font-family: var(--font-data);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--chapter-accent, var(--purple));
  opacity: 0.9;
}

@supports (-webkit-text-stroke: 1px black) {
  .page-about .about-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1px var(--chapter-accent, var(--purple));
  }
}

.page-about .about-chapter__head h2 {
  margin: 6px 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.2;
}

.page-about .about-chapter__body {
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-about .about-chapter__text p {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--text-main);
}

.page-about .about-chapter__text p strong {
  color: var(--green);
  font-weight: 600;
}

.page-about .about-chapter__figure {
  margin: 0;
  border: 1px solid var(--divider);
  background: var(--bg-card);
}

.page-about .about-chapter__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-bottom: 1px solid var(--divider);
}

.page-about .about-chapter__figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--text-sub);
}

/* ---------- 数据规模：环形仪表 ---------- */
.page-about .about-stats {
  padding: 40px 20px;
  background: var(--bg-rail);
  border-bottom: 1px solid var(--divider);
}

.page-about .about-stats__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.page-about .about-stats__ring {
  --ring-progress: 80%;
  position: relative;
  display: grid;
  place-items: center;
  width: var(--about-ring-size);
  height: var(--about-ring-size);
  border-radius: 50%;
  background: conic-gradient(var(--green) var(--ring-progress), var(--bg-grid) 0);
}

.page-about .about-stats__ring--purple {
  background: conic-gradient(var(--purple) var(--ring-progress), var(--bg-grid) 0);
}

.page-about .about-stats__ring--gold {
  background: conic-gradient(var(--gold) var(--ring-progress), var(--bg-grid) 0);
}

.page-about .about-stats__ring::before {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 50%;
  background: var(--bg-rail);
}

.page-about .about-stats__value {
  position: relative;
  font-family: var(--font-data);
  font-size: 1.28rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-main);
}

.page-about .about-stats__label {
  font-family: var(--font-head);
  font-size: 0.86rem;
  color: var(--text-sub);
}

/* ---------- 技术架构：徽标、日志终端、数据流程 ---------- */
.page-about .about-tech__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-terminal {
  margin-top: 28px;
  border: 1px solid var(--divider);
  background: #060b16;
  font-family: var(--font-data);
  font-size: 0.78rem;
  line-height: 1.8;
  color: rgba(57, 255, 136, 0.88);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

.page-about .about-terminal__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid var(--divider);
  background: var(--bg-card);
  color: var(--text-sub);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.page-about .about-terminal__status {
  color: var(--green);
  font-weight: 700;
}

.page-about .about-terminal pre {
  margin: 0;
  padding: 16px 14px;
  overflow-x: auto;
  white-space: pre;
}

.page-about .about-tech__steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--divider);
  background: var(--divider);
}

.page-about .about-tech__steps li {
  padding: 14px 8px;
  background: var(--bg-card);
  text-align: center;
  font-family: var(--font-head);
  font-size: 0.84rem;
  color: var(--text-main);
}

.page-about .about-tech__steps li span {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--green);
}

/* ---------- 里程碑：纵向时间轴 ---------- */
.page-about .about-milestones {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-milestones__item {
  position: relative;
  padding: 0 0 34px;
}

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

.page-about .about-milestones__item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -30px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--chapter-accent, var(--gold));
}

.page-about .about-milestones__tag {
  font-family: var(--font-data);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-milestones__item h3 {
  margin: 8px 0 6px;
  font-family: var(--font-head);
  font-size: 1.18rem;
  font-weight: 800;
}

.page-about .about-milestones__item p {
  margin: 0;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-sub);
}

/* ---------- 团队文化：价值观列表 ---------- */
.page-about .about-team__values {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__values li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  border: 1px solid var(--divider);
  background: var(--bg-card);
  font-family: var(--font-head);
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-main);
}

.page-about .about-team__values li span {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--gold);
  border: 1px solid rgba(255, 211, 110, 0.4);
  padding: 2px 6px;
}

/* ---------- 信任承诺 ---------- */
.page-about .about-trust {
  padding: 72px 20px;
  background:
    radial-gradient(720px 360px at 50% 120%, rgba(57, 255, 136, 0.06), transparent 60%),
    var(--bg-deep);
}

.page-about .about-trust__inner {
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}

.page-about .about-trust blockquote {
  margin: 16px 0 20px;
  padding: 0;
  border: none;
}

.page-about .about-trust blockquote p {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
}

.page-about .about-trust__body {
  max-width: 640px;
  margin: 0 auto 30px;
  font-family: var(--font-body);
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--text-sub);
}

.page-about .about-trust__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

/* ---------- 桌面端增强 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 52px 32px 88px;
  }

  .page-about .about-hero__content {
    margin-top: 36px;
  }

  .page-about .about-hero h1 {
    max-width: 900px;
    font-size: clamp(2.6rem, 5vw, 4rem);
  }

  .page-about .about-hero__chapters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-width: 680px;
  }

  .page-about .about-chapter {
    padding: 96px 32px;
  }

  .page-about .about-chapter__container {
    padding-left: 36px;
  }

  .page-about .about-chapter__body {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
  }

  .page-about .about-chapter--team .about-chapter__body {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .page-about .about-chapter__num {
    font-size: 3rem;
  }

  .page-about .about-stats {
    padding: 56px 32px;
  }

  .page-about .about-stats__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .about-stats__ring {
    --about-ring-size: 128px;
  }

  .page-about .about-stats__value {
    font-size: 1.5rem;
  }

  .page-about .about-stats__label {
    font-size: 0.92rem;
  }

  .page-about .about-tech__badges {
    margin-top: 24px;
  }

  .page-about .about-terminal pre {
    font-size: 0.82rem;
  }

  .page-about .about-milestones__item {
    padding-bottom: 40px;
  }

  .page-about .about-trust {
    padding: 96px 32px;
  }
}

/* ---------- 动效减弱兼容 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__chapters a {
    transition: none;
    transform: none;
  }
}