/* ============================================================
   Concept: filter
   Visual effects on an element (blur, brightness, grayscale...).
   ============================================================ */

/* ---------- Base reset & typography ---------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
  line-height: 1.6;
  color: #1f2937;
  background: #f8fafc;
  padding: 2rem;
}
.page-header {
  max-width: 760px;
  margin: 0 auto 2rem;
}
.page-header h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
  color: #0f172a;
}
.page-header .lead {
  color: #475569;
}
.demo {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.box {
  padding: 1rem;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
}

.row2 {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.fi {
  width: 130px;
  height: 130px;
  object-fit: cover;
  border-radius: 6px;
}
.blur {
  filter: blur(3px);
}
.gray {
  filter: grayscale(100%);
}
.sepia {
  filter: sepia(80%);
}
.hue {
  filter: hue-rotate(90deg) saturate(1.4);
}