* {
  box-sizing: border-box;
  font-family: "Segoe UI", Arial, sans-serif;
}

body {
  background: #f2f2f2;
  margin: 0;
  padding: 30px;
  color: #222;
}

/* ===== KHUNG FORM ===== */
body > div {
  max-width: 800px;
  margin: auto;
  background: #fff;
  padding: 25px 30px;
  border: 1px solid #dcdcdc;
}

/* ===== TIÊU ĐỀ ===== */
h3 {
  margin: 0 0 20px 0;
  font-size: 20px;
  font-weight: 600;
}

/* ===== INPUT ===== */
input,
select {
  height: 32px;
  padding: 4px 8px;
  font-size: 14px;
  border: 1px solid #bfbfbf;
  outline: none;
}

input:focus,
select:focus {
  border-color: #4a7bd0;
}

/* ===== KÍCH THƯỚC ===== */
#SO_QD,
#CHI_NHANH {
  width: 260px;
}

#NGAY,
#THANG {
  width: 50px;
  text-align: center;
}

#NAM {
  width: 80px;
  text-align: center;
}

/* ===== DÒNG THÀNH VIÊN ===== */
[id^="row"] {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

[id^="row"] input {
  width: 180px;
}

/* ===== BUTTON ===== */
button {
  height: 34px;
  padding: 0 14px;
  font-size: 14px;
  border: 1px solid #4a7bd0;
  background: #4a7bd0;
  color: #fff;
  cursor: pointer;
}

button:hover {
  background: #3d6ab8;
}

/* ===== HR ===== */
hr {
  border: none;
  height: 1px;
  background: #dcdcdc;
  margin: 20px 0;
}

/* ===== FILE ===== */
input[type="file"] {
  border: none;
  padding: 0;
}