/* Nền chung */
body {
  background-color: #ffff99;
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 0;
}

/* Khung chính */
#wrapper {
  background-color: white;
  border: 2px #f6921e solid;
  border-radius: 40px;
  text-align: left;
  width: 800px;
  margin: 10px auto;
  padding: 0;
}

/* Header, contents, sidebar, footer */
#header {
  height: 160px;
  margin: 0;
  padding-top: 10px;
}

#contents {
  width: 600px;
  float: right;
  margin: 0;
  padding: 10px;
}

#sidebar {
  width: 160px;
  float: left;
  margin: 0;
  padding: 10px;
  background-color: #ffcc66;
}

#footer {
  clear: both;
  text-align: center;
  margin: 0;
  padding: 0.5em 0;
  font-size: 0.8em;
}

/* Link trong CONTENTS (để nhìn thấy trên nền trắng) */
#contents a, #contents a:link, #contents a:visited {
  color: #0b3382;
  text-decoration: underline;
  font-weight: bold;
}

/* Link trong SIDEBAR */
#sidebar a, #sidebar a:link, #sidebar a:visited {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

/* Nút màu xanh (bluebutton) trong sidebar */
a.bluebutton {
  border: 2px solid #0b3382;
  background-color: #0b3382;
  color: #ffffff;
  font-size: 1.1em;
  padding: 12px 10px;
  border-radius: 8px;
  display: block;
  width: 100%;
  box-sizing: border-box;
}

a.bluebutton:hover {
  border: 2px solid #f6921e;
  background-color: #f6921e;
  color: #ffffff;
  text-decoration: none;
}

/* Menu table */
table.sidebarmenu {
  width: 100%;
  line-height: 4em;
}

/* Tiêu đề phần nội dung */
td.contenttitle {
  color: #0b3382;
  background-color: #f6921e;
  font-size: 2em;
  padding: 8pt 1.5pt;
  text-align: left;
}

/* ===== Time Table (giống ảnh bạn gửi) ===== */
table.timetable {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  background-color: #ffffff;
  border: 1px solid #999999;
}

table.timetable th,
table.timetable td {
  border: 1px solid #999999;
  padding: 10px;
  vertical-align: top;
  height: 110px;
  word-break: break-word;
  overflow-wrap: anywhere;
}

table.timetable th {
  background-color: #e6e6e6;
  text-align: center;
  font-weight: bold;
}

table.timetable th.period {
  width: 50px;
  background-color: #e6e6e6;
}

table.timetable th.sat {
  background-color: #ffcc66;
}

/* Link trong timetable giống ảnh (xanh + underline) */
table.timetable a {
  color: #0000ee;
  text-decoration: underline;
  font-weight: normal;
  display: inline-block;
}

/* ===== Calendar boxed style ===== */
table.yearcal {
  width: 100%;
  table-layout: fixed;
  border-collapse: separate;
  border-spacing: 0;
}

table.yearcal td {
  vertical-align: top;
  padding: 14px 10px;
}

table.month {
  width: 100%;
  border-collapse: collapse;
  border: 4px solid #000;
  background-color: #ffffff;
}

table.month caption {
  font-size: 28px;
  font-weight: bold;
  text-align: center;
  padding-bottom: 8px;
  color: #000000;
}

table.month th,
table.month td {
  border: 2px solid #000;
  text-align: center;
  padding: 4px 0;
  font-size: 13px;
  background-color: #ffffff;
}

table.month th {
  font-weight: bold;
}

table.month td.empty {
  color: transparent;
}

/* Chủ nhật đỏ, thứ 7 xanh */
table.month th:first-child,
table.month td:first-child {
  color: red;
}

table.month th:last-child,
table.month td:last-child {
  color: blue;
}