/* Week 5 - Turn 2 - Mã đề B: Đăng ký hiến máu tình nguyện */
* { box-sizing: border-box; }
body { margin: 0; font-family: "Segoe UI", Arial, sans-serif; background: #fef2f2; color: #7f1d1d; }
header.trang-header { background: #991b1b; color: #ffffff; padding: 22px 28px; }
header.trang-header h1 { margin: 0 0 6px; font-size: 1.5rem; }
header.trang-header p { margin: 0; color: #fecaca; }
nav.dieu-huong-nho { padding: 10px 28px; background: #fee2e2; }
nav.dieu-huong-nho a { color: #991b1b; margin-right: 14px; text-decoration: none; font-weight: 600; }
nav.dieu-huong-nho a:hover { text-decoration: underline; }
main { max-width: 980px; margin: 0 auto; padding: 24px 20px 48px; }
div.khung-de-bai { background: #ffffff; border: 1px solid #fecaca; border-radius: 8px; padding: 18px 22px; margin-bottom: 22px; }
div.khung-de-bai h2 { color: #991b1b; margin-top: 0; }
form.form-hien-mau { background: #ffffff; border: 1px solid #fecaca; border-radius: 10px; padding: 22px; margin-bottom: 22px; }
header.tieu-chuan-hien-mau {
  background: #fff5f5; border: 1px solid #fca5a5; border-radius: 8px; padding: 14px 18px; margin-bottom: 20px;
}
header.tieu-chuan-hien-mau h3 { margin: 0 0 4px; color: #991b1b; font-size: 1.05rem; }
header.tieu-chuan-hien-mau p { margin: 0; font-size: 0.88rem; color: #b91c1c; }
.khung-y-te { display: flex; flex-wrap: wrap; gap: 20px; }
fieldset.nhom-the-luc, fieldset.nhom-ho-so-mau, fieldset.nhom-sang-loc {
  flex: 1 1 280px; border: 1px solid #fca5a5; border-radius: 8px; padding: 16px; margin: 0;
}
legend { font-weight: bold; color: #991b1b; padding: 0 8px; }
.truong-explicit, .truong-implicit { margin-bottom: 14px; display: flex; flex-direction: column; }
.truong-explicit label { margin-bottom: 5px; font-weight: 600; font-size: 0.9rem; }
.truong-explicit input, .truong-explicit textarea {
  padding: 8px 10px; border: 1px solid #fca5a5; border-radius: 6px; font-family: inherit; font-size: 0.95rem;
}
.truong-implicit label.nhan-long {
  font-weight: 600; font-size: 0.9rem; display: flex; flex-direction: column; gap: 6px; cursor: pointer;
}
.truong-implicit label.nhan-long input {
  padding: 8px 10px; border: 1px solid #fca5a5; border-radius: 6px; font-family: inherit; font-size: 0.95rem;
}
input:focus, textarea:focus {
  outline: none; border-color: #991b1b; box-shadow: 0 0 0 3px rgba(153, 27, 27, 0.25); background: #fff5f5;
}
small.huong-dan { color: #991b1b; font-size: 0.82rem; margin-top: 4px; font-weight: normal; }
.nhom-radio, .nhom-checkbox { margin-bottom: 12px; display: flex; flex-direction: column; gap: 6px; }
.nhom-radio span, .nhom-checkbox span { font-weight: 600; font-size: 0.9rem; margin-bottom: 4px; }
.nhom-radio label, .nhom-checkbox label { font-weight: normal; font-size: 0.9rem; display: flex; align-items: center; gap: 6px; cursor: pointer; }
.nhom-radio input, .nhom-checkbox input { cursor: pointer; }
.nhom-radio input:focus, .nhom-checkbox input:focus { outline: 2px solid #991b1b; outline-offset: 2px; }
.nut-gui-wrapper { margin-top: 18px; }
.nut-gui {
  background: #991b1b; color: #ffffff; border: none; padding: 12px 28px;
  border-radius: 6px; font-size: 1rem; font-weight: 600; cursor: pointer;
}
.nut-gui:hover { background: #7f1d1d; }
.nut-gui:focus { outline: 3px solid #f87171; outline-offset: 2px; }
aside.bao-cao-a11y {
  background: #ffffff; border: 1px solid #fecaca; border-radius: 8px; padding: 18px 22px; margin-bottom: 22px;
}
aside.bao-cao-a11y h2 { color: #991b1b; margin-top: 0; }
aside.bao-cao-a11y ol { margin: 0 0 12px; padding-left: 20px; line-height: 1.5; font-size: 0.92rem; }
aside.bao-cao-a11y p { line-height: 1.6; font-size: 0.92rem; }
footer.trang-footer { text-align: center; padding: 16px; color: #991b1b; font-size: 0.85rem; }