* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  border: none;
}

body {
  font-size: 16px;
}

h2, h3 {
  border-top: 1px solid #c0c0c0;
  padding-top: 0.3em;
}

h1 {
  font-size: 24px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 20px;
}

img {
  max-width: 100%;
}

table {
  border-collapse: collapse;
}

th, td {
  padding: 0.5em 0.3em;
}

details {
  margin: 1em 0;
}

input:invalid{
  border-color: #900;
  background-color: #FDD;
}

input:focus:invalid {
  outline: none;
}

/* ==================== Specific classes ==================== */

.dialog {
  flex-direction: column;
  justify-content: center;
  align-items: center;

  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 9990;
  background-color: rgba(0, 0, 0, 0.8);
}

.dialog-open {
  display: flex;
}

.dialog-close {
  display: none;
}

.top-right-pane {
  position: absolute;
  right: 0;
  top: 2em;
  z-index: 9990;
  background-color: rgba(0, 0, 0, 0.8);
}

.pane-open {
  display: block;
}

.pane-close {
  display: none;
}

.dialog-content {
  background-color: #c0c0c0;
  padding: 1em;
  border-radius: 0.5em;
}

.buttonlike {
  text-decoration: none;
  padding: 0.2em 0.4em;
  border-radius: 0.3em;
  background-color: #e0e0e0;
  color: black;
}

.form_label {
  text-align: end;
}

.form_value {
  text-align: start;
}

.form_single {
  text-align: center;
}

.center {
  text-align: center;
}

.errors {
  margin: 1em;
  padding: 0.5em;
  border: 2px solid #F00;
}

.main-table {
  width: 90%;
  margin: 0 5%;
  border: 1px solid black;
}
.main-table th, .main-table td {
  border-style: none solid;
  border-width: 0 1px;
  background-color: #f0f0ff;
}
.main-table tr:nth-child(odd) th,
.main-table tr:nth-child(odd) td {
  background-color: #f8f8f8;
}

.main-form {
  display: inline-block;
  background-color: #f8f8f8;
  padding: 0.5em 0.5em;
  width: 100%;
}
.main-form table {
  width: 100%;
}
.main-form input[type="text"] {
  width: 90%;
  max-width: 32em;
}
.main-form td {
  line-height: 120%;
  vertical-align: top;
}

.centering-form {
  text-align: center;
}

.form-key {
  text-align: end;
}
.form-value {
  text-align: start;
}
.form-centered {
  text-align: center;
}

.alternating-bgcolor:nth-child(2n) {
  background-color: #f0f0ff;
}
.alternating-bgcolor:nth-child(2n+1) {
  background-color: #f8f8f8;
}

.align-end {
  text-align: end;
}

.bordered {
  border: 1px solid #404040;
  padding: 4px;
}

.image-area {
  text-align: center;
  margin-top: 2em;
  margin-bottom:2em;
}

.image-area .image-caption {
  max-width: 700px;
  margin: 0 auto;
}

.box-pre-like-style {
  max-width: 700px;
  margin: 1em auto;
  white-space: pre-wrap;
  padding: 1em;
  border: 1px solid black;
}

.notice {
  margin: 0.5em 1vw 0 1vw;
  padding: 0.1em 0.4em;
  border: 2px solid #800000;
  border-radius: 0.5em;
  font-size: smaller;
  color: #600000;
}

/* ==================== Specific elements ==================== */

#header {
  display: flex;
  flex-direction: row;
  justify-content: space-between;

  background-color: #fff0c0;
  padding: 0.4em 0.5em 0.4em 0.5em;
}

#header a {
  text-decoration: none;
  padding: 0.1em 0.3em;
  border-radius: 0.3em;
  background-color: #805010;
  color: white;
}

#content {
  margin: 0 0.5em 0 0.5em;
  width: calc(100% - 1em);
  padding-bottom: 1em;
}

#form_create_room #name {
  width: 20em;
}
#form_create_room #pass {
  width: 40em;
}

#login_pane {
  background-color: #f0f0f0;
}

#form_create_user #name {
  width: 20em;
}
#form_create_user #pass {
  width: 40em;
}