.page-about,
.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about {
  position: relative;
  overflow-x: hidden;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 20px 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.page-about .breadcrumb a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--accent-green);
  text-decoration: underline;
}

/* ===== 首屏封面 ===== */
.page-about .about-hero {
  position: relative;
  padding: 48px 20px 44px;
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 70%, var(--bg-panel) 150%);
  border-bottom: 1px solid var(--data-line);
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.18), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-green) 0%, var(--accent-blue) 40%, transparent 80%);
  z-index: 1;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-width);
  margin: 0 auto;
}

.page-about .about-hero__eyebrow {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-bottom: 16px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 900;
  font-style: italic;
  line-height: 1.12;
  letter-spacing: -0.02em;
  transform: skewX(-6deg);
  color: var(--text-primary);
  margin-bottom: 20px;
  max-width: 760px;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 620px;
  margin-bottom: 28px;
}

.page-about .about-hero__inner::after {
  content: '';
  display: block;
  width: 64px;
  height: 4px;
  margin-bottom: 24px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  border-top: 1px solid var(--data-line);
  padding-top: 18px;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 96px;
}

.page-about .about-hero__num {
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent-blue);
  line-height: 1.1;
}

.page-about .about-hero__label {
  font-size: 12px;
  color: var(--text-secondary);
}

/* ===== 品牌使命 ===== */
.page-about .about-mission {
  padding: 56px 20px;
  position: relative;
}

.page-about .about-mission__grid {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-mission__side {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.page-about .about-kicker {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-bottom: 10px;
}

.page-about .about-mission__index {
  font-family: var(--font-data);
  font-size: 64px;
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--card-border);
  display: block;
}

.page-about .about-mission__title {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 900;
  font-style: italic;
  line-height: 1.2;
  transform: skewX(-5deg);
  color: var(--text-primary);
  margin-bottom: 18px;
}

.page-about .about-mission__text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.page-about .about-mission__text:last-child {
  margin-bottom: 0;
}

/* ===== 区块通用标题行 ===== */
.page-about .about-section-head {
  max-width: var(--container-width);
  margin: 0 auto 28px;
  padding: 0 20px;
}

.page-about .about-section-head__kicker,
.page-about .about-section-head__label {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-bottom: 10px;
}

.page-about .about-section-head__title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 900;
  font-style: italic;
  line-height: 1.2;
  transform: skewX(-5deg);
  color: var(--text-primary);
  margin-bottom: 10px;
  text-wrap: balance;
}

.page-about .about-section-head__desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 460px;
}

/* ===== 发展里程碑 ===== */
.page-about .about-timeline-section {
  padding: 56px 0 48px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--data-line);
  border-top: 1px solid var(--data-line);
  position: relative;
  overflow: hidden;
}

.page-about .about-timeline-section::before {
  content: '';
  position: absolute;
  left: -20px;
  top: 0;
  width: 120px;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-blue), transparent);
  opacity: 0.05;
  pointer-events: none;
}

.page-about .about-timeline-visual {
  position: relative;
  max-width: var(--container-width);
  margin: 0 auto 32px;
  padding: 0 20px;
}

.page-about .about-timeline-visual__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--card-border);
  border-radius: 6px;
  background: var(--gradient-end);
}

.page-about .about-timeline-visual__badge {
  position: absolute;
  top: 16px;
  right: 32px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  background: var(--accent-green);
  color: var(--bg-deep);
  padding: 4px 10px;
  transform: skewX(-10deg);
}

.page-about .about-timeline-track {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-green) var(--bg-deep);
}

.page-about .about-timeline-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-timeline-track::-webkit-scrollbar-thumb {
  background: var(--accent-green);
  border-radius: 3px;
}

.page-about .about-milestone {
  position: relative;
  flex: 0 0 84%;
  scroll-snap-align: start;
  background: var(--bg-deep);
  border: 1px solid var(--card-border);
  border-left: 4px solid var(--accent-green);
  padding: 22px 18px;
}

.page-about .about-milestone__tag {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  background: rgba(57, 255, 20, 0.1);
  color: var(--accent-green);
  border-radius: 2px;
  margin-bottom: 14px;
}

.page-about .about-milestone__title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  font-style: italic;
  color: var(--text-primary);
  margin-bottom: 8px;
  transform: skewX(-4deg);
}

.page-about .about-milestone__text {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ===== 数据能力 ===== */
.page-about .about-data-section {
  position: relative;
  padding: 56px 20px;
  overflow: hidden;
}

.page-about .about-data-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
  transform: skewX(-15deg);
  transform-origin: left;
  pointer-events: none;
}

.page-about .about-data-section::after {
  content: '';
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(57, 255, 20, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about .about-data-grid {
  position: relative;
  z-index: 1;
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-kicker--data {
  color: var(--accent-blue);
}

.page-about .about-data-text__title {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 900;
  font-style: italic;
  transform: skewX(-5deg);
  color: var(--text-primary);
  margin-bottom: 12px;
}

.page-about .about-data-text__lead {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

.page-about .about-data-list {
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
  display: grid;
  gap: 10px;
}

.page-about .about-data-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  color: var(--text-primary);
}

.page-about .about-data-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  width: 10px;
  height: 10px;
  background: var(--accent-blue);
  transform: skewX(-15deg);
}

.page-about .about-data-more {
  margin-top: 12px;
  border: 1px dashed var(--card-border);
  padding: 0 14px;
  font-size: 13px;
  color: var(--text-secondary);
}

.page-about .about-data-more summary {
  cursor: pointer;
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--accent-blue);
  padding: 12px 0;
  list-style: none;
  user-select: none;
  display: inline-block;
}

.page-about .about-data-more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-data-more summary::before {
  content: '+';
  margin-right: 8px;
  color: var(--accent-green);
  font-weight: 700;
  font-size: 16px;
  line-height: 1;
}

.page-about .about-data-more[open] summary::before {
  content: '–';
}

.page-about .about-data-more p {
  padding-bottom: 14px;
  margin: 0;
  line-height: 1.65;
}

.page-about .about-data-visual {
  position: relative;
}

.page-about .about-data-visual__img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--card-border);
  clip-path: polygon(3% 0, 100% 0, 97% 100%, 0 100%);
  background: var(--gradient-end);
}

.page-about .about-data-visual__tag {
  position: absolute;
  bottom: 14px;
  left: 0;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.12em;
  background: var(--accent-blue);
  color: var(--bg-deep);
  padding: 4px 10px;
  transform: skewX(-10deg);
}

/* ===== 用户认可 ===== */
.page-about .about-validation-section {
  padding: 56px 20px;
  background: var(--bg-panel);
  border-top: 1px solid var(--data-line);
  position: relative;
  overflow: hidden;
}

.page-about .about-validation-section::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.15), transparent 70%);
  pointer-events: none;
}

.page-about .about-validation-head {
  position: relative;
  z-index: 1;
  max-width: var(--container-width);
  margin: 0 auto 28px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-validation-head__title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 900;
  font-style: italic;
  line-height: 1.15;
  transform: skewX(-5deg);
  margin: 0;
  color: var(--text-primary);
}

.page-about .about-validation-head__desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 460px;
}

.page-about .about-validation-body {
  position: relative;
  z-index: 1;
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-validation-chart__img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--card-border);
  border-radius: 6px;
  background: var(--gradient-end);
}

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

.page-about .about-stat {
  background: var(--bg-deep);
  border: 1px solid var(--card-border);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
}

.page-about .about-stat--feature {
  border-color: var(--accent-green);
  box-shadow: inset 0 0 0 1px var(--accent-green);
}

.page-about .about-stat__num {
  font-family: var(--font-data);
  font-size: 26px;
  font-weight: 700;
  color: var(--accent-blue);
  line-height: 1.1;
}

.page-about .about-stat--feature .about-stat__num {
  color: var(--accent-green);
}

.page-about .about-stat__label {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ===== 延伸阅读 ===== */
.page-about .about-links {
  padding: 56px 20px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.page-about .about-links__title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 900;
  font-style: italic;
  transform: skewX(-5deg);
  margin-bottom: 8px;
  color: var(--text-primary);
}

.page-about .about-links__desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.page-about .about-links__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-links__list li {
  border-left: 2px solid var(--accent-blue);
  padding-left: 14px;
}

.page-about .about-links__list a {
  color: var(--accent-blue);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.page-about .about-links__list a:hover {
  color: var(--accent-green);
  text-decoration: underline;
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about .breadcrumb {
    padding: 24px 40px 0;
  }

  .page-about .about-hero {
    padding: 88px 40px 64px;
  }

  .page-about .about-hero__title {
    font-size: 64px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-hero__stats {
    gap: 48px;
  }

  .page-about .about-hero__num {
    font-size: 28px;
  }

  .page-about .about-mission {
    padding: 88px 40px;
  }

  .page-about .about-mission__grid {
    grid-template-columns: 1fr 2fr;
    gap: 48px;
  }

  .page-about .about-mission__title {
    font-size: 34px;
  }

  .page-about .about-mission__text {
    font-size: 16px;
  }

  .page-about .about-section-head {
    padding: 0 40px;
  }

  .page-about .about-section-head__title {
    font-size: 38px;
  }

  .page-about .about-timeline-section {
    padding: 72px 0 64px;
  }

  .page-about .about-timeline-visual {
    padding: 0 40px 36px;
  }

  .page-about .about-timeline-track {
    padding: 0 40px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    overflow: visible;
    scroll-snap-type: none;
  }

  .page-about .about-milestone {
    flex: initial;
  }

  .page-about .about-data-section {
    padding: 88px 40px;
  }

  .page-about .about-data-grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .about-data-text__title {
    font-size: 32px;
  }

  .page-about .about-data-list {
    grid-template-columns: 1fr 1fr;
    column-gap: 24px;
  }

  .page-about .about-validation-section {
    padding: 88px 40px;
  }

  .page-about .about-validation-head {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-validation-head__title {
    font-size: 38px;
  }

  .page-about .about-validation-head__desc {
    font-size: 15px;
    padding-top: 38px;
  }

  .page-about .about-validation-body {
    grid-template-columns: minmax(0, 460px) 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-stat__num {
    font-size: 32px;
  }

  .page-about .about-links {
    padding: 72px 40px;
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-links__desc {
    margin-bottom: 0;
  }

  .page-about .about-links__list {
    gap: 14px;
  }
}