html {
  height: 100%;
  background: rgb(16, 16, 15);
}

body {
  position: relative;
  height: 100%;
  color: rgb(250, 250, 250);
  line-height: 1.4;
  font-family: "Sawarabi Mincho", "Noto Serif JP", serif;
  font-size: 16px;
}

body::before {
  position: fixed;
  content: "";
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: radial-gradient(rgb(25, 22, 16), rgb(16, 16, 15));
  z-index: -1;
}

.container {
  max-width: 720px;
  padding-left: 15px;
  padding-right: 15px;
  margin-left: auto;
  margin-right: auto;
}

.article {
  padding: 0.5rem 15px 2rem 15px;
  margin: 0.5rem auto;
  border: 1px solid rgba(68, 60, 44, 0.5);
  box-shadow: 0px 0px 5px 3px rgba(68, 60, 44, 0.5);
}

.cover {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: 1000;
  background: rgb(16, 16, 15);
  animation: cover_anim 1s ease-in forwards;
  pointer-events: none;
}

@keyframes cover_anim {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

/* ヘッダー関連 */
.header {
  margin: 1.5rem 0;
  display: flex;
  flex-flow: row wrap;
  justify-content: flex-end;
  align-items: flex-end;
}
.header .navigation {
  margin-top: 1.5rem;
  display: flex;
  flex-flow: row wrap;
  justify-content: flex-end;
  align-items: flex-end;
}

.header .inonote {
  display: inline-block;
  flex-grow: 1;
  margin: 0;
  text-decoration: none;
}

.header .inonote a {
  text-decoration: none;
}

.header .navigation .nav-item {
  display: inline-block;
}

.header .navigation a {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: 1px solid rgba(68, 60, 44, 0.5);
  box-shadow: 0px 0px 5px 3px rgba(68, 60, 44, 0.5);
  width: 100%;
  text-align: center;
  transition: transform 0.36s;
  transform: translate(0px, 0px);
  text-decoration: none;
}

@media (max-width: 575.98px) { /* sp */
  .header .navigation {
    width: 100%;
  }
  
  .header .navigation .nav-item {
    flex: 1 1;
  }
}
.header .navigation a:first-child {
  margin-right: 0;
}

.header .navigation a:last-child {
  margin-left: 0;
}

.header .navigation a:hover {
  transform: translate(0px, -8px);
}

/* 汎用 */
h1, .h1 {
  font-size: 2.0rem;
}
h2, .h2 {
  font-size: 1.75rem;
}
h3, .h3 {
  font-size: 1.5rem;
}
h4, .h4 {
  font-size: 1.25rem;
}
h5, .h5 {
  font-size: 1.0rem;
}
h6, .h6 {
  font-size: 1.0rem;
}
h1, .h1, h2, .h2, h3, .h3, h4, .h4, h5, .h5 {
  margin-top: 1.0em;
  margin-bottom: 0.5em;
  font-weight: 600;
}
h3, .h3, h4, .h4, h5, .h5 {
  padding: 0.25em 0em;
  border-bottom: 1px solid rgba(68, 60, 44, 7.5);
}
.w-100 {
  width: 100%;
}
.mt-1 {
  margin-top: 0.25rem;
}
.mt-2 {
  margin-top: 0.5rem;
}
.mt-3 {
  margin-top: 0.75rem;
}
.mt-4 {
  margin-top: 1.00rem;
}
.mb-1 {
  margin-bottom: 0.25rem;
}
.mb-2 {
  margin-bottom: 0.5rem;
}
.mb-3 {
  margin-bottom: 0.75rem;
}
.mb-4 {
  margin-bottom: 1.00rem;
}
.ml-1 {
  margin-left: 0.25rem;
}
.ml-2 {
  margin-left: 0.5rem;
}
.ml-3 {
  margin-left: 0.75rem;
}
.ml-4 {
  margin-left: 1.00rem;
}
.mr-1 {
  margin-right: 0.25rem;
}
.mr-2 {
  margin-right: 0.5rem;
}
.mr-3 {
  margin-right: 0.75rem;
}
.mr-4 {
  margin-right: 1.00rem;
}

.pt-1 {
  padding-top: 0.25rem;
}
.pt-2 {
  padding-top: 0.5rem;
}
.pt-3 {
  padding-top: 0.75rem;
}
.pt-4 {
  padding-top: 1.00rem;
}
.pb-1 {
  padding-bottom: 0.25rem;
}
.pb-2 {
  padding-bottom: 0.5rem;
}
.pb-3 {
  padding-bottom: 0.75rem;
}
.pb-4 {
  padding-bottom: 1.00rem;
}
.pl-1 {
  padding-left: 0.25rem;
}
.pl-2 {
  padding-left: 0.5rem;
}
.pl-3 {
  padding-left: 0.75rem;
}
.pl-4 {
  padding-left: 1.00rem;
}
.pr-1 {
  padding-right: 0.25rem;
}
.pr-2 {
  padding-right: 0.5rem;
}
.pr-3 {
  padding-right: 0.75rem;
}
.pr-4 {
  padding-right: 1.00rem;
}
.m-auto {
  margin: auto;
}
.mx-auto {
  margin-left: auto;
  margin-right: auto;
}
.text-center {
  text-align: center;
}

.table {
  text-align: center;
}
.table th, .table td {
  padding: 0.25em 0.5em;
}
ul {
  list-style: disc;
  padding-left: 1.5em;
}
ul li {
  margin-bottom: 0.2em;
}
a {
  text-decoration: underline;
}
a:active {
  color:rgb(207, 184, 138);
}
p {
  margin-bottom: 0.25em;
}
.badge {
  display: inline-block;
  background: rgba(68, 60, 44, 0.5);
  padding: 0.125em 0.5em;
  margin: 0.25em 0.125em;
  border-radius: 0.125em;
}
.text-muted {
  color: rgb(153, 127, 76);
}
small, .small {
  font-size: 0.85rem;
}
.border {
  border: 1px solid rgba(68, 60, 44, 0.5);
}
.shadow {
  box-shadow: 0px 0px 5px 3px rgba(68, 60, 44, 0.5);
}