.page-about {
  --about-hero-pad: clamp(2.5rem, 6vw, 5rem);
  overflow-x: clip;
  color: var(--c-blue);
  background: var(--c-ivory);
}

/* ===== 面包屑上下文 ===== */
.page-about-context {
  padding-top: var(--space-2);
}
.page-about .breadcrumb {
  font-family: var(--font-body);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--c-gray);
}
.page-about .breadcrumb a {
  color: var(--c-clay);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  color: var(--c-orange);
}

/* ===== 眉题 ===== */
.page-about-kicker {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-clay);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 var(--space-1);
}
.page-about-kicker::before {
  content: "";
  width: 28px;
  height: 3px;
  background: currentColor;
  flex: 0 0 auto;
}
.page-about-kicker-light {
  color: var(--c-neon);
}

/* ===== 英雄区 ===== */
.page-about-hero {
  position: relative;
  background: var(--c-blue);
  color: var(--c-ivory);
  padding: var(--about-hero-pad) 0;
  overflow: hidden;
}
.page-about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 240, 232, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 240, 232, 0.06) 1px, transparent 1px);
  background-size: 38px 38px;
  pointer-events: none;
}
.page-about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -25%;
  width: 60%;
  height: 70%;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.25), transparent 68%);
  pointer-events: none;
}
.page-about-hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}
.page-about-eyebrow {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-neon);
  margin-bottom: var(--space-2);
}
.page-about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-2);
  max-width: 15em;
  text-wrap: balance;
}
.page-about-hero-lead {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(245, 240, 232, 0.78);
  max-width: 46rem;
  margin-bottom: var(--space-2);
}
.page-about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.page-about-hero-tags .tag-neutral {
  color: var(--c-ivory);
  border-color: rgba(245, 240, 232, 0.35);
}

/* 装饰大字 */
.page-about-hero-deco {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 220px;
}
.page-about-hero-deco-text {
  font-family: var(--font-heading);
  font-size: clamp(4.5rem, 13vw, 8.5rem);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 2px var(--c-orange);
  text-transform: uppercase;
  position: relative;
  z-index: 1;
}
.page-about-hero-deco-shape {
  position: absolute;
  width: min(70%, 260px);
  height: auto;
  opacity: 0.65;
}

/* ===== Section 通用 ===== */
.page-about-section {
  padding: var(--space-4) 0;
}
.page-about-section h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.7rem, 3.5vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 var(--space-2);
  max-width: 14em;
  text-wrap: balance;
}
.page-about-section p {
  font-family: var(--font-body);
  line-height: 1.8;
}

/* ===== 品牌理念 ===== */
.page-about-philosophy {
  background: var(--c-ivory);
  padding-top: var(--space-5);
}
.page-about-philosophy-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.page-about-philosophy-copy p {
  margin-bottom: 1rem;
  max-width: 34em;
}
.page-about-philosophy-list {
  list-style: none;
  margin: var(--space-2) 0 var(--space-3);
  padding: 0;
  border-top: 1px solid rgba(10, 31, 68, 0.12);
}
.page-about-philosophy-list li {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  padding: 0.9rem 0 0.9rem 1.6rem;
  border-bottom: 1px solid rgba(10, 31, 68, 0.12);
  position: relative;
}
.page-about-philosophy-list li::before {
  content: "◆";
  position: absolute;
  left: 0;
  top: 1rem;
  font-size: 0.6rem;
  color: var(--c-clay);
}

.page-about-philosophy-figure {
  margin: 0;
  position: relative;
}
.page-about-philosophy-figure::before {
  content: "";
  position: absolute;
  inset: -10px 12px 12px -12px;
  border: 2px solid var(--c-clay);
  z-index: 0;
  border-radius: var(--radius);
}
.page-about-philosophy-figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}
.page-about-philosophy-figure figcaption {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--c-gray);
  margin-top: 0.8rem;
  padding-left: 0.2rem;
}

/* ===== 数据来源与核查 ===== */
.page-about-data {
  background: var(--c-blue);
  color: var(--c-ivory);
  position: relative;
  overflow: hidden;
}
.page-about-data::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(245, 240, 232, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 240, 232, 0.04) 1px, transparent 1px);
  background-size: 34px 34px;
  pointer-events: none;
}
.page-about-data .container {
  position: relative;
}
.page-about-data-head {
  max-width: 46rem;
  margin-bottom: var(--space-3);
}
.page-about-data-head h2 {
  color: var(--c-ivory);
}
.page-about-data-lead {
  color: rgba(245, 240, 232, 0.78);
}
.page-about-data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.page-about-data-card {
  background: rgba(245, 240, 232, 0.05);
  border: 1px solid rgba(245, 240, 232, 0.14);
  border-radius: var(--radius);
  padding: var(--space-3);
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.page-about-data-card:hover {
  border-color: var(--c-neon);
  transform: translateY(-2px);
}
.page-about-data-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.8rem;
  color: var(--c-orange);
  line-height: 1;
  margin-bottom: var(--space-1);
}
.page-about-data-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin: 0 0 0.5rem;
  color: var(--c-ivory);
}
.page-about-data-card p {
  color: rgba(245, 240, 232, 0.72);
  font-size: 0.9rem;
  margin: 0;
}
.page-about-data-figure {
  margin: 0;
}
.page-about-data-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(245, 240, 232, 0.16);
  border-radius: var(--radius);
}
.page-about-data-figure figcaption {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: rgba(245, 240, 232, 0.55);
  margin-top: 0.8rem;
}

/* ===== 旧版本档案 ===== */
.page-about-archive {
  background:
    linear-gradient(rgba(10, 31, 68, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 31, 68, 0.04) 1px, transparent 1px);
  background-size: 26px 26px;
  padding-top: var(--space-5);
}
.page-about-archive-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: center;
}
.page-about-archive-copy p {
  max-width: 34em;
  margin-bottom: 1rem;
}
.page-about-archive-copy .btn {
  margin-top: var(--space-1);
}
.page-about-archive-visual {
  background: var(--c-ink);
  border: 1px solid rgba(10, 31, 68, 0.2);
  border-radius: var(--radius);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.page-about-archive-frame {
  display: flex;
  align-items: flex-end;
  gap: 0.6rem;
  height: 180px;
  padding: var(--space-2);
  background:
    linear-gradient(rgba(245, 240, 232, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 240, 232, 0.07) 1px, transparent 1px);
  background-size: 20px 20px;
  border-radius: 2px;
}
.page-about-archive-bar {
  width: 24%;
  border-radius: 2px 2px 0 0;
}
.page-about-archive-bar-1 {
  height: 62%;
  background: linear-gradient(180deg, var(--c-clay), rgba(198, 93, 60, 0.5));
}
.page-about-archive-bar-2 {
  height: 82%;
  background: linear-gradient(180deg, var(--c-orange), rgba(255, 107, 53, 0.5));
}
.page-about-archive-bar-3 {
  height: 100%;
  background: linear-gradient(180deg, var(--c-neon), rgba(57, 255, 20, 0.4));
}
.page-about-archive-caption {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: rgba(245, 240, 232, 0.7);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0;
}

/* ===== 版本时间轴 ===== */
.page-about-timeline {
  background: var(--c-ivory);
  padding-top: var(--space-5);
}
.page-about-timeline-head {
  max-width: 46rem;
  margin-bottom: var(--space-3);
}
.page-about-timeline-lead {
  color: var(--c-gray);
  max-width: 42em;
}
.page-about-timeline-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
.page-about-timeline-list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about-version-item {
  position: relative;
  padding: 0 0 0 2.2rem;
}
.page-about-version-item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 20px;
  bottom: -8px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--c-gray) 0 4px, transparent 4px 8px);
}
.page-about-version-marker {
  position: absolute;
  left: 0;
  top: 18px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-ivory);
  border: 3px solid var(--c-clay);
  z-index: 1;
}
.page-about-version-details {
  border-bottom: 1px solid rgba(10, 31, 68, 0.14);
}
.page-about-version-details summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.9rem 0;
  transition: color 0.15s ease;
}
.page-about-version-details summary::-webkit-details-marker {
  display: none;
}
.page-about-version-details summary:hover {
  color: var(--c-clay);
}
.page-about-version-label {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-clay);
  white-space: nowrap;
}
.page-about-version-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
}
.page-about-version-toggle {
  margin-left: auto;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--c-gray);
  transition: transform 0.2s ease;
}
.page-about-version-details[open] .page-about-version-toggle {
  transform: rotate(45deg);
  color: var(--c-orange);
}
.page-about-version-details p {
  margin: 0 0 1.2rem;
  font-size: 0.92rem;
  color: rgba(10, 31, 68, 0.82);
  max-width: 34em;
}
.page-about-timeline-visual {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.page-about-timeline-svg {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  margin: 0 auto;
}
.page-about-timeline-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid rgba(10, 31, 68, 0.12);
}

/* ===== 团队与服务能力 ===== */
.page-about-team {
  background: var(--c-ink);
  color: var(--c-ivory);
  position: relative;
  overflow: hidden;
  padding-top: var(--space-5);
}
.page-about-team::before {
  content: "";
  position: absolute;
  right: -15%;
  bottom: -20%;
  width: 50%;
  height: 60%;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.18), transparent 70%);
  pointer-events: none;
}
.page-about-team .container {
  position: relative;
}
.page-about-team-head h2 {
  color: var(--c-ivory);
}
.page-about-team-lead {
  color: rgba(245, 240, 232, 0.75);
  max-width: 36em;
}
.page-about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin: var(--space-3) 0;
}
.page-about-team-card {
  background: rgba(245, 240, 232, 0.06);
  border: 1px solid rgba(245, 240, 232, 0.14);
  border-radius: var(--radius);
  padding: var(--space-2);
  transition: border-color 0.2s ease;
}
.page-about-team-card:hover {
  border-color: var(--c-orange);
}
.page-about-team-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.2rem;
  color: var(--c-orange);
  line-height: 1;
  margin-bottom: var(--space-1);
}
.page-about-team-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin: 0 0 0.6rem;
  color: var(--c-ivory);
}
.page-about-team-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about-team-card li {
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: rgba(245, 240, 232, 0.7);
  line-height: 1.7;
  padding-left: 1rem;
  position: relative;
}
.page-about-team-card li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--c-neon);
}
.page-about-team-footer {
  border-top: 1px solid rgba(245, 240, 232, 0.16);
  padding-top: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.page-about-team-footer-copy h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin: 0 0 0.5rem;
  color: var(--c-ivory);
}
.page-about-team-footer-copy p {
  color: rgba(245, 240, 232, 0.75);
  font-size: 0.9rem;
  max-width: 40em;
  margin: 0;
}
.page-about-team-footer-action {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* ===== 响应式 ===== */
@media (min-width: 720px) {
  .page-about-data-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about-team-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about-team-footer {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 980px) {
  .page-about-hero-inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.6fr);
    gap: var(--space-4);
    align-items: center;
  }
  .page-about-hero-deco {
    min-height: 280px;
  }
  .page-about-philosophy-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--space-4);
    align-items: center;
  }
  .page-about-philosophy-copy {
    padding-right: var(--space-3);
  }
  .page-about-archive-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-4);
  }
  .page-about-timeline-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}