.page-about {
  --about-lime: #A3E635;
  --about-orange: #FF6B35;
  --about-violet: #9D4EDD;
  --about-muted: #969A9F;
  --about-line: rgba(224, 225, 221, 0.16);
  --about-line-strong: rgba(224, 225, 221, 0.34);
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-panel) 46%, var(--c-panel-deep) 100%);
  color: var(--c-ink);
  overflow: hidden;
}

/* ========== 面包屑 ========== */
.page-about .about-breadcrumb-wrap {
  padding-top: 20px;
}

.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-muted);
  padding: 16px 0 0;
}

.page-about .about-breadcrumb a {
  color: var(--c-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.page-about .about-breadcrumb a:hover {
  color: var(--c-lime);
  border-color: var(--c-lime);
}

.page-about .breadcrumb-sep {
  color: var(--c-line-strong);
}

.page-about .breadcrumb-current {
  color: var(--c-ink);
}

/* ========== Hero ========== */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding: clamp(40px, 7vw, 96px) 0;
  position: relative;
}

.page-about .about-hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.page-about .about-hero-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--about-lime);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-kicker::before {
  content: "";
  width: 28px;
  height: 2px;
  background: currentColor;
  flex: none;
}

.page-about .about-batch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-muted);
  background: rgba(11, 12, 16, 0.55);
  border: 1px solid var(--about-line);
  border-radius: 999px;
  padding: 6px 12px;
}

.page-about .batch-pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--about-lime);
  box-shadow: 0 0 0 0 rgba(163, 230, 53, 0.6);
  animation: about-pulse 2s infinite;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.6vw, 58px);
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-ink);
  margin: 0 0 22px;
  max-width: 720px;
}

.page-about .about-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-muted);
  max-width: 520px;
  margin: 0 0 30px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-figure {
  margin: 0;
  position: relative;
  transform: rotate(1.5deg);
  transition: transform 0.35s ease;
}

.page-about .about-hero-figure:hover {
  transform: rotate(0deg) translateY(-4px);
}

.page-about .about-hero-figure::before {
  content: "";
  position: absolute;
  inset: -14px 14px 14px -14px;
  border: 2px solid var(--about-violet);
  border-radius: var(--radius);
  opacity: 0.35;
  pointer-events: none;
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 2px solid var(--about-line-strong);
  box-shadow: var(--shadow);
  background: linear-gradient(135deg, #1B263B, #0B0C10);
}

.page-about .about-hero-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-muted);
  margin-top: 14px;
  padding-left: 4px;
  letter-spacing: 0.05em;
  transform: rotate(0.5deg);
}

/* ========== 章节体系 ========== */
.page-about .about-chapter {
  border-top: 1px solid var(--about-line);
  padding: clamp(56px, 9vw, 110px) 0;
  position: relative;
}

.page-about .about-chapter--01 {
  background: linear-gradient(135deg, rgba(163, 230, 53, 0.05), transparent 50%);
}

.page-about .about-chapter--02 {
  background: linear-gradient(225deg, rgba(157, 78, 221, 0.07), transparent 50%);
}

.page-about .about-chapter--03 {
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.06), transparent 50%);
}

.page-about .about-chapter--04 {
  background: linear-gradient(225deg, rgba(163, 230, 53, 0.045), transparent 50%);
}

.page-about .about-chapter--01 { --about-accent: var(--about-lime); }
.page-about .about-chapter--02 { --about-accent: var(--about-violet); }
.page-about .about-chapter--03 { --about-accent: var(--about-orange); }
.page-about .about-chapter--04 { --about-accent: var(--about-lime); }

.page-about .about-chapter-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  position: relative;
}

.page-about .about-chapter-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  position: relative;
}

.page-about .about-chapter-head::after {
  content: "";
  width: 42px;
  height: 2px;
  background: var(--about-accent);
  margin-top: 16px;
  opacity: 0.65;
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: clamp(76px, 11vw, 142px);
  font-weight: 700;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px var(--about-line-strong);
  letter-spacing: -0.05em;
  transition: color 0.35s, -webkit-text-stroke 0.35s, transform 0.3s ease;
}

.page-about .about-chapter:hover .chapter-num {
  color: var(--about-accent);
  -webkit-text-stroke: 1px transparent;
  transform: translateX(6px);
}

.page-about .chapter-axis {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--about-muted);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  position: absolute;
  left: 8px;
  top: 96px;
  height: 110px;
  pointer-events: none;
  opacity: 0.75;
}

.page-about .about-chapter-body {
  min-width: 0;
}

.page-about .about-chapter-body h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.2;
  font-weight: 700;
  color: var(--c-ink);
  margin: 0 0 18px;
  position: relative;
  padding-left: 16px;
}

.page-about .about-chapter-body h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  bottom: 5px;
  width: 4px;
  border-radius: 2px;
  background: var(--about-accent);
}

.page-about .chapter-lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-ink);
  margin-bottom: 16px;
  max-width: 620px;
}

.page-about .about-chapter-body p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
  margin-bottom: 14px;
  max-width: 640px;
}

.page-about .about-chapter-body .btn {
  margin-top: 10px;
}

.page-about .about-chapter--01 .about-chapter-body h2::before {
  background: var(--about-lime);
}

.page-about .about-chapter--02 .about-chapter-body h2::before {
  background: var(--about-violet);
}

.page-about .about-chapter--03 .about-chapter-body h2::before {
  background: var(--about-orange);
}

.page-about .about-chapter--04 .about-chapter-body h2::before {
  background: var(--about-lime);
}

/* ========== 时间线 ========== */
.page-about .about-timeline {
  border-top: 1px solid var(--about-line);
  padding: clamp(60px, 9vw, 112px) 0;
  background: linear-gradient(180deg, rgba(11, 12, 16, 0.3), rgba(11, 12, 16, 0.65));
}

.page-about .about-timeline-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 32px;
}

.page-about .timeline-kicker {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--about-orange);
}

.page-about .about-timeline-head h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 700;
  color: var(--c-ink);
  margin: 0;
}

.page-about .timeline-hero {
  margin: 0 0 40px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: #0B0C10;
  position: relative;
}

.page-about .timeline-hero img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .timeline-hero figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-muted);
  padding: 10px 16px;
  border-top: 1px solid var(--about-line);
  background: rgba(11, 12, 16, 0.6);
  letter-spacing: 0.05em;
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .timeline-item {
  background: var(--c-panel);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  padding: 20px;
  position: relative;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.page-about .timeline-item:hover {
  border-color: var(--about-line-strong);
  transform: translateY(-3px);
  box-shadow: 6px 6px 0 rgba(11, 12, 16, 0.7);
}

.page-about .timeline-node {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--about-lime);
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  margin-bottom: 12px;
  background: rgba(11, 12, 16, 0.4);
}

.page-about .timeline-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-ink);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.page-about .timeline-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
  margin: 0;
}

/* ========== 服务理念 ========== */
.page-about .about-philosophy {
  border-top: 1px solid var(--about-line);
  padding: clamp(60px, 9vw, 112px) 0;
  background: radial-gradient(ellipse at 100% 0%, rgba(157, 78, 221, 0.08), transparent 55%);
}

.page-about .about-philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .philosophy-kicker {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--about-lime);
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .philosophy-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.18;
  font-weight: 700;
  color: var(--c-ink);
  margin: 0 0 20px;
}

.page-about .philosophy-copy p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
  margin-bottom: 16px;
  max-width: 580px;
}

.page-about .philosophy-trust {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-muted);
  border-left: 3px solid var(--about-orange);
  padding: 6px 0 6px 16px;
  margin-top: 22px;
}

.page-about .philosophy-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-line);
  transform: rotate(-1.2deg);
  transition: transform 0.35s ease;
}

.page-about .philosophy-figure:hover {
  transform: rotate(0deg);
}

.page-about .philosophy-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .philosophy-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-muted);
  padding: 10px 16px;
  border-top: 1px solid var(--about-line);
  background: rgba(11, 12, 16, 0.6);
  letter-spacing: 0.05em;
}

/* ========== 底部内链导航 ========== */
.page-about .about-next-links {
  border-top: 1px solid var(--about-line);
  padding: clamp(40px, 6vw, 72px) 0;
  background: rgba(11, 12, 16, 0.5);
}

.page-about .about-next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .next-link {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 18px;
  row-gap: 4px;
  background: var(--c-panel);
  border: 2px solid var(--about-line);
  border-radius: var(--radius);
  padding: 22px 24px;
  text-decoration: none;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.page-about .next-link::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: var(--about-accent, var(--about-orange));
  opacity: 0;
  transition: opacity 0.3s;
}

.page-about .next-link:nth-child(1) {
  --about-accent: var(--about-orange);
}

.page-about .next-link:nth-child(2) {
  --about-accent: var(--about-violet);
}

.page-about .next-link:hover {
  border-color: var(--about-line-strong);
  transform: translateY(-3px);
  box-shadow: 6px 6px 0 rgba(11, 12, 16, 0.75);
}

.page-about .next-link:hover::before {
  opacity: 1;
}

.page-about .next-index {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--about-accent);
  grid-row: 1 / 3;
  align-self: center;
  min-width: 40px;
}

.page-about .next-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .next-desc {
  font-size: 13px;
  color: var(--c-muted);
}

/* ========== 动画 ========== */
@keyframes about-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(163, 230, 53, 0.55);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(163, 230, 53, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(163, 230, 53, 0);
  }
}

/* ========== 桌面端增强 ========== */
@media (min-width: 768px) {
  .page-about .about-hero {
    grid-template-columns: 1.05fr 0.95fr;
    gap: clamp(36px, 6vw, 84px);
    align-items: center;
  }

  .page-about .about-hero-meta {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .page-about .about-chapter-inner {
    grid-template-columns: 0.9fr 1.1fr;
    gap: clamp(40px, 7vw, 110px);
    align-items: start;
  }

  .page-about .about-chapter--02 .about-chapter-inner,
  .page-about .about-chapter--04 .about-chapter-inner {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .page-about .about-chapter--02 .about-chapter-head,
  .page-about .about-chapter--04 .about-chapter-head {
    grid-column: 2;
    grid-row: 1;
    align-items: flex-end;
    text-align: right;
  }

  .page-about .about-chapter--02 .about-chapter-head::after,
  .page-about .about-chapter--04 .about-chapter-head::after {
    margin-left: auto;
  }

  .page-about .about-chapter--02 .chapter-axis,
  .page-about .about-chapter--04 .chapter-axis {
    left: auto;
    right: 8px;
    transform: rotate(90deg);
  }

  .page-about .about-chapter--02 .about-chapter-body,
  .page-about .about-chapter--04 .about-chapter-body {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-chapter--02 .about-chapter-body .btn,
  .page-about .about-chapter--04 .about-chapter-body .btn {
    margin-right: auto;
  }

  .page-about .about-chapter-body h2 {
    padding-left: 20px;
  }

  .page-about .about-chapter-body p {
    font-size: 16px;
  }

  .page-about .chapter-lead {
    font-size: 19px;
  }

  .page-about .timeline-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .page-about .about-philosophy-grid {
    grid-template-columns: 1fr 0.92fr;
    gap: clamp(40px, 7vw, 96px);
    align-items: center;
  }

  .page-about .about-next-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero {
    min-height: calc(100vh - 120px);
  }

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

  .page-about .about-lead {
    font-size: 18px;
  }

  .page-about .chapter-num {
    font-size: 142px;
  }

  .page-about .chapter-axis {
    top: 116px;
  }
}