.page-about {
  --about-block: clamp(38px, 6vw, 86px);
  --about-quote: clamp(18px, 2.6vw, 26px);
}

.page-about .crumbs {
  padding-top: clamp(16px, 2.4vw, 30px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  border-bottom: var(--line);
  background: linear-gradient(180deg, var(--ink-800), rgba(11, 13, 14, 0) 78%);
  padding-block: clamp(26px, 4.6vw, 62px) clamp(32px, 5.6vw, 74px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-hero-main {
  border-left: 3px solid var(--cinnabar);
  padding-left: clamp(14px, 2.2vw, 26px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 7vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 12px 0 18px;
  overflow-wrap: anywhere;
}

.page-about .about-hero .lead {
  max-width: 62ch;
  color: var(--text);
}

.page-about .about-hero .btn-row {
  margin-top: clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero-meta {
  align-self: start;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--graphite);
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--text);
}

.page-about .about-facts li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-facts .num {
  min-width: 78px;
  font-size: 21px;
  line-height: 1.1;
  color: var(--signal);
}

/* ---------- 页内目录 ---------- */
.page-about .about-toc {
  border-bottom: var(--line);
  padding-block: 14px;
  overflow-x: auto;
}

.page-about .about-toc ul {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-toc a {
  display: inline-block;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--graphite);
  border-radius: var(--radius);
  padding: 7px 13px;
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--paper);
  border-color: var(--cinnabar);
  transform: translateX(1px);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  border-bottom: var(--line);
  padding-block: var(--about-block);
}

.page-about .about-section .section-head {
  margin-bottom: clamp(26px, 4vw, 52px);
}

.page-about .about-section .lead {
  margin-top: 12px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(26px, 4vw, 50px);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-about .about-origin .prose p {
  margin: 0 0 16px;
}

.page-about .about-quote {
  margin: clamp(20px, 3vw, 34px) 0 0;
  border: 2px solid var(--graphite);
  border-left: 6px solid var(--cinnabar);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  padding: clamp(18px, 2.6vw, 30px);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--about-quote);
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-frame-3-2 { aspect-ratio: 3 / 2; }
.page-about .about-tl-frame { aspect-ratio: 3 / 4; }
.page-about .about-frame-12-7 { aspect-ratio: 12 / 7; }

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-origin-figure,
.page-about .about-team-figure {
  margin: 0;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tl-item {
  display: grid;
  gap: 10px;
  grid-template-columns: minmax(0, 1fr);
  padding-block: clamp(18px, 2.6vw, 30px);
  border-top: var(--line);
}

.page-about .about-tl-item:last-child {
  border-bottom: var(--line);
}

.page-about .about-year {
  display: inline-block;
  width: fit-content;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 36px);
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper);
  border-left: 4px solid var(--cinnabar);
  padding: 2px 0 2px 10px;
}

.page-about .about-tl-item--now .about-year {
  background: var(--cinnabar);
  border-left-color: var(--cinnabar);
  color: var(--paper);
  padding: 4px 12px;
}

.page-about .about-tl-body h3 {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 23px);
  font-weight: 800;
  color: var(--text);
  margin: 0 0 8px;
}

.page-about .about-tl-body p {
  margin: 0 0 10px;
  color: var(--text);
}

.page-about .about-tl-body details {
  border-top: 1px dashed var(--graphite);
  margin-top: 6px;
  padding-top: 9px;
}

.page-about .about-tl-body summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--cinnabar-soft);
}

.page-about .about-tl-body summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tl-body summary::before {
  content: "＋ ";
  color: var(--signal);
}

.page-about .about-tl-body details[open] summary::before {
  content: "－ ";
}

.page-about .about-tl-body details p {
  margin: 9px 0 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队能力带 ---------- */
.page-about .about-caps {
  display: grid;
  gap: clamp(22px, 3.4vw, 42px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-cap {
  border: 1px solid var(--graphite);
  border-radius: var(--radius);
  background: var(--ink-900);
  padding: clamp(16px, 2.2vw, 24px);
  transition: border-color 180ms ease, transform 180ms ease;
}

.page-about .about-cap:hover,
.page-about .about-cap:focus-within {
  border-color: var(--cinnabar);
  transform: translateY(-1px);
}

.page-about .about-cap-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
}

.page-about .about-cap-bar {
  margin-top: 12px;
  height: 14px;
  background: var(--ink-800);
  border: 1px solid var(--graphite);
  overflow: hidden;
}

.page-about .about-cap-fill {
  display: block;
  height: 100%;
  transition: filter 180ms ease;
}

.page-about .about-cap-fill--a {
  width: 37%;
  background: var(--cinnabar);
}

.page-about .about-cap-fill--b {
  width: 31%;
  background: var(--signal);
}

.page-about .about-cap:hover .about-cap-fill,
.page-about .about-cap:focus-within .about-cap-fill {
  filter: brightness(1.18);
}

.page-about .about-cap-note {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-team-note {
  margin-top: clamp(20px, 3vw, 34px);
  border-top: var(--line);
  padding-top: clamp(16px, 2.4vw, 26px);
}

.page-about .about-team-note p {
  margin: 0;
  max-width: 68ch;
  color: var(--text);
}

.page-about .about-team-figure {
  margin-top: clamp(26px, 4vw, 46px);
}

/* ---------- 服务半径 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--graphite);
  border: 1px solid var(--graphite);
}

.page-about .about-stat {
  background: var(--ink-800);
  padding: clamp(16px, 2.4vw, 28px);
}

.page-about .about-stat .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.05;
  color: var(--paper);
}

.page-about .about-stat .stat-unit {
  font-size: 0.5em;
  margin-left: 4px;
  color: var(--signal);
}

.page-about .about-stat p {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-scope-grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(26px, 4vw, 48px);
}

.page-about .about-scope-card {
  border-top: 2px solid var(--graphite);
  padding-top: 16px;
}

.page-about .about-scope-card h3 {
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .about-scope-card p {
  margin: 0;
  color: var(--text);
}

/* ---------- 长期做法 ---------- */
.page-about .about-principles {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-principle {
  padding: clamp(20px, 2.8vw, 30px);
}

.page-about .about-principle-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  color: var(--cinnabar);
  margin-bottom: 12px;
}

.page-about .about-principle .panel-title {
  margin-bottom: 10px;
}

.page-about .about-principle p {
  margin: 0;
  color: var(--text);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  border-bottom: 0;
}

.page-about .about-cta-inner {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
  border: 2px solid var(--graphite);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  padding: clamp(22px, 3.6vw, 48px);
}

.page-about .about-cta-inner .section-title {
  margin-bottom: 12px;
}

.page-about .about-cta-inner .lead {
  margin: 0;
}

.page-about .about-cta-inner .btn-row {
  flex-wrap: wrap;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-tl-item {
    grid-template-columns: 124px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-scope-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-caps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 1000px) {
  .page-about .about-timeline {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-timeline-aside {
    position: sticky;
    top: 110px;
    align-self: start;
  }

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

  .page-about .about-scope-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cap,
  .page-about .about-cap-fill,
  .page-about .about-toc a {
    transition: none;
  }
}