.page-about {
  background: #0a1628;
  color: #e8edf4;
  overflow-x: hidden;
}

/* ===== 英雄区 / 章节预览首屏 ===== */
.page-about .about-hero {
  padding: 44px 0 64px;
  position: relative;
  z-index: 0;
  background:
    linear-gradient(rgba(16, 31, 60, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 31, 60, 0.55) 1px, transparent 1px);
  background-size: 32px 32px;
  border-bottom: 2px solid #1e2f4a;
}

.page-about .about-hero::after {
  content: "ABOUT · 2016-2024";
  position: absolute;
  right: 16px;
  bottom: 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: #2c4466;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 44px;
}

.page-about .about-hero__header .mono-label {
  color: #00ff88;
  font-size: 11px;
}

.page-about .about-hero__header h1 {
  font-family: var(--font-heading);
  font-size: 32px;
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin: 14px 0 20px;
}

.page-about .about-hero__lead {
  font-size: 14px;
  line-height: 1.9;
  color: #8b9cb4;
  max-width: 56ch;
  margin: 0;
}

.page-about .about-hero__preview {
  border: 2px solid #1e2f4a;
  background: #0d1b32;
  display: grid;
  position: relative;
  box-shadow: 12px 12px 0 rgba(16, 31, 60, 0.6);
}

.page-about .about-hero__preview::before {
  content: "PAGE INDEX";
  position: absolute;
  top: -11px;
  left: 16px;
  background: #0a1628;
  padding: 0 8px;
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: #00ff88;
}

.page-about .about-hero__preview-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-bottom: 1px solid #1e2f4a;
  text-decoration: none;
  color: #e8edf4;
  transition: background 0.25s ease, gap 0.25s ease;
}

.page-about .about-hero__preview-item:last-child {
  border-bottom: 0;
}

.page-about .about-hero__preview-item:hover {
  background: rgba(245, 197, 24, 0.06);
  gap: 22px;
}

.page-about .about-hero__preview-no {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 13px;
  color: #f5c518;
  min-width: 30px;
  border-right: 1px solid #1e2f4a;
  padding-right: 12px;
}

.page-about .about-hero__preview-name {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.3;
}

.page-about .about-hero__preview-desc {
  display: block;
  font-size: 12px;
  color: #8b9cb4;
  margin-top: 3px;
}

/* ===== 品牌故事 ===== */
.page-about .about-brand {
  padding: 72px 0;
  border-bottom: 2px solid #1e2f4a;
}

.page-about .about-brand__grid {
  display: grid;
  gap: 40px;
  margin-top: 56px;
  align-items: start;
}

.page-about .about-brand__lead {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.5;
  color: #e8edf4;
  margin: 0 0 20px;
}

.page-about .about-brand__content p {
  font-size: 14px;
  line-height: 1.9;
  color: #8b9cb4;
  margin-bottom: 16px;
}

.page-about .about-brand__stats {
  list-style: none;
  margin: 32px 0 0;
  padding: 20px 0 0;
  border-top: 2px solid #1e2f4a;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.page-about .about-brand__stats li {
  font-size: 12px;
  color: #8b9cb4;
  line-height: 1.4;
  padding-left: 14px;
  border-left: 3px solid #f5c518;
}

.page-about .about-brand__num {
  display: block;
  font-family: var(--font-data);
  font-size: 21px;
  font-weight: 700;
  color: #f5c518;
  margin-bottom: 4px;
}

.page-about .about-brand__figure {
  margin: 0;
  border-left: 2px solid #1e2f4a;
  padding-left: 20px;
  align-self: end;
}

.page-about .about-brand__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid #1e2f4a;
}

.page-about .about-brand__figure figcaption {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.15em;
  color: #2c4466;
}

/* ===== 发展历程时间轴 ===== */
.page-about .about-milestones {
  padding: 72px 0 48px;
  border-bottom: 2px solid #1e2f4a;
}

.page-about .about-milestones__intro {
  margin: 24px 0 56px;
  font-size: 14px;
  line-height: 1.9;
  color: #8b9cb4;
  max-width: 72ch;
}

.page-about .about-timeline {
  position: relative;
  padding-top: 8px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, #f5c518 0%, #1e2f4a 30%, #1e2f4a 70%, #00ff88 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 48px 56px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: 7px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid #f5c518;
  background: #0a1628;
  z-index: 1;
  transition: box-shadow 0.3s ease;
}

.page-about .about-timeline__dot::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: #f5c518;
  transition: transform 0.3s ease;
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  box-shadow: 0 0 0 6px rgba(245, 197, 24, 0.14);
}

.page-about .about-timeline__item:hover .about-timeline__dot::after {
  transform: scale(1.45);
}

.page-about .about-timeline__content {
  border-top: 2px solid #1e2f4a;
  padding-top: 20px;
}

.page-about .about-timeline__content .mono-label {
  color: #f5c518;
  font-size: 11px;
}

.page-about .about-timeline__content h3 {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  margin: 8px 0 10px;
  color: #e8edf4;
}

.page-about .about-timeline__content p {
  font-size: 13px;
  line-height: 1.8;
  color: #8b9cb4;
  margin: 0;
}

/* ===== 数据安全与合规 ===== */
.page-about .about-security {
  padding: 72px 0;
  border-bottom: 2px solid #1e2f4a;
}

.page-about .about-security__grid {
  display: grid;
  gap: 40px;
  margin-top: 56px;
  align-items: center;
}

.page-about .about-security__lead {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.5;
  color: #e8edf4;
  margin: 0 0 20px;
}

.page-about .about-security__content p {
  font-size: 14px;
  line-height: 1.9;
  color: #8b9cb4;
  margin-bottom: 16px;
}

.page-about .about-security__certs {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border: 2px solid #1e2f4a;
  background: #0d1b32;
}

.page-about .about-security__cert {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  border-bottom: 1px solid #1e2f4a;
}

.page-about .about-security__cert:last-child {
  border-bottom: 0;
}

.page-about .about-security__cert-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  color: #00ff88;
  background: rgba(0, 255, 136, 0.08);
  border: 1px solid rgba(0, 255, 136, 0.25);
}

.page-about .about-security__cert strong {
  display: block;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: #e8edf4;
}

.page-about .about-security__cert em {
  font-style: normal;
  font-size: 12px;
  color: #8b9cb4;
  display: block;
  margin-top: 3px;
}

.page-about .about-security__figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.page-about .about-security__figure img {
  width: 100%;
  max-width: 360px;
  height: auto;
  border: 1px solid #1e2f4a;
}

.page-about .about-security__figure figcaption {
  font-size: 11px;
  letter-spacing: 0.15em;
  color: #2c4466;
}

/* ===== 团队与规模 ===== */
.page-about .about-team {
  padding: 72px 0;
  border-bottom: 2px solid #1e2f4a;
}

.page-about .about-team__grid {
  display: grid;
  gap: 40px;
  margin-top: 56px;
  align-items: center;
}

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

.page-about .about-team__figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid #1e2f4a;
}

.page-about .about-team__figure figcaption {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.15em;
  color: #2c4466;
}

.page-about .about-team__content p {
  font-size: 14px;
  line-height: 1.9;
  color: #8b9cb4;
  margin-bottom: 16px;
}

.page-about .about-team__numbers {
  margin-top: 32px;
  display: grid;
  gap: 18px;
}

.page-about .about-team__bar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 6px 14px;
}

.page-about .about-team__bar-label {
  font-size: 13px;
  font-weight: 700;
  color: #e8edf4;
}

.page-about .about-team__bar-value {
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  color: #f5c518;
}

.page-about .about-team__bar-track {
  grid-column: 1 / -1;
  display: block;
  height: 10px;
  background: #0d1b32;
  border: 1px solid #1e2f4a;
  overflow: hidden;
}

.page-about .about-team__bar-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #f5c518 0%, #ffd75e 100%);
  transition: width 0.5s ease;
}

.page-about .about-team__bar--dev .about-team__bar-fill {
  width: 54%;
}

.page-about .about-team__bar--data .about-team__bar-fill {
  width: 25%;
}

.page-about .about-team__bar--support .about-team__bar-fill {
  width: 12.5%;
}

/* ===== 未来展望 ===== */
.page-about .about-future {
  padding: 72px 0;
  border-bottom: 2px solid #1e2f4a;
}

.page-about .about-future__lead {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.6;
  max-width: 42em;
  margin: 32px 0 48px;
  color: #e8edf4;
  border-left: 4px solid #f5c518;
  padding-left: 20px;
}

.page-about .about-future__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-future__item {
  border-top: 2px solid #1e2f4a;
  padding-top: 20px;
}

.page-about .about-future__item-index {
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  color: #00ff88;
  display: block;
  margin-bottom: 10px;
}

.page-about .about-future__item h3 {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  color: #e8edf4;
  margin: 0 0 10px;
}

.page-about .about-future__item p {
  font-size: 13px;
  line-height: 1.8;
  color: #8b9cb4;
  margin: 0;
}

.page-about .about-future__links {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ===== 信任声明 / 收尾 ===== */
.page-about .about-trust {
  padding: 40px 0;
  background: #0d1b32;
  border-bottom: 2px solid #1e2f4a;
}

.page-about .about-trust__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
}

.page-about .about-trust__text {
  font-size: 12px;
  line-height: 1.8;
  color: #8b9cb4;
  max-width: 70ch;
  margin: 0;
}

.page-about .about-trust__text strong {
  color: #00ff88;
  font-weight: 700;
}

/* ===== 桌面端布局 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 56px 0 80px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-hero__header h1 {
    font-size: 44px;
  }

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

  .page-about .about-brand__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }

  .page-about .about-brand__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .page-about .about-timeline {
    padding-top: 16px;
  }

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

  .page-about .about-timeline__item {
    width: 50%;
    padding: 0 64px 56px 0;
    text-align: right;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 56px 64px;
    text-align: left;
  }

  .page-about .about-timeline__dot {
    left: auto;
    right: -11px;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__dot {
    right: auto;
    left: -11px;
  }

  .page-about .about-security__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
  }

  .page-about .about-security__figure {
    order: 1;
  }

  .page-about .about-security__content {
    order: 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 56px;
  }

  .page-about .about-future__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }

  .page-about .about-future__item {
    padding-right: 16px;
  }
}