/* ============================================================
   suanqiu V4 — Layout Primitives
   ============================================================ */

.section {
  padding: clamp(4rem, 8vh, 8rem) clamp(1.5rem, 5vw, 3rem);
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
  width: 100%;
}

.section-header {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
  position: relative;
}

.section-marker {
  font-family: var(--font-display);
  font-size: clamp(0.75rem, 0.85vw, 0.875rem);
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.section-marker::before {
  content: '';
  width: 24px;
  height: 1.5px;
  background: var(--accent);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-desc {
  font-size: clamp(1rem, 1.1vw, 1.125rem);
  color: var(--muted);
  max-width: 560px;
  line-height: 1.6;
}

/* --- 页脚贴底（全站统一）：内容不足一屏时，页脚固定在视口底部 --- */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1 0 auto; }