html,
body {
  height: 100%;
  margin: 0;
}

button:hover {
  cursor: pointer;
  background-color: color-mix(in srgb, var(--Red) 95%, black);
  transition: 0.3s;
}

button:active {
  background-color: color-mix(in srgb, var(--Red) 95%, white);
  transform: scale(0.95);
  transition: 0.3s;
}

uls {
  border: 0;
  padding: 0;
}

.box {
  display: flex;
  flex-direction: column;
}

ul {
  list-style-type: none;
  padding-left: 1.4em;
}

.p-button {
  padding: 8px;
}

.header {
  grid-area: header;
  border-top: 3px solid var(--Red);
  background-color: var(--White);

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: var(--MediumFont);

  box-shadow: 0 7px 10px -1px rgba(0, 0, 0, 0.1);
  padding-bottom: 0.4em;
  padding-top: 0.4em;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-grow: 1;
  justify-content: center;
  gap: 1em;
  padding: 0;
  margin: 0;
}

.nav-list li {
  display: flex;
  align-items: center;
  font-family: var(--NormalFamilyFont);
}

.nav-link {
  padding: 8px;
  color: var(--DarkGray);
  font-family: var(--NormalFamilyFont);
  text-decoration: none;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: var(--Red);
}

.footer {
  grid-area: footer;
  background-color: var(--DarkGray2);

  display: flex;
  flex-direction: column;
  font-size: var(--SmallFont);
  font-family: var(--NormalFamilyFont);

  padding: 0.4em;
}

.nav-list-footer {
  list-style: none;
  padding: 0;
}

.footer-content {
  display: flex;
  justify-content: center;
  align-items: center;
}

.footer-content * {
  flex: 1;
  justify-items: center;
  align-content: center;

  color: var(--DarkGray);
}

.copyright * {
  color: var(--DarkGray);
  align-self: center;
  justify-self: center;
  text-align: center;
}

@media(max-width: 300px) {
  .footer-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }
}

.error-banner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: #ff4d4d;
  color: white;
  text-align: center;
  padding: 12px;
  font-weight: bold;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
}

.error-banner.hidden {
  display: none;
  transform: translateY(-100%);
}

.success-banner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: fixed;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: #2ef33f;
  color: white;
  text-align: center;
  padding: 12px;
  font-weight: bold;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
}

.success-banner.hidden {
  transform: translateY(-100%);
}

.error-banner > button, 
.success-banner > button {
  background-color: transparent;
  border: none;
}

:root {
  /*color*/
  --Red: rgb(196, 64, 64);
  --Gray: rgb(161, 161, 161);
  --DarkGray: rgb(66, 66, 66);
  --DarkGray2: rgb(31, 31, 31);
  --LightGray: rgb(247, 247, 247);
  --White: rgb(255, 255, 255);

  /*font*/
  --TitleFont: clamp(0.5rem + 2vw, 1rem + 5vw, 2rem + 6vw);
  --MediumFont: clamp(0.35rem + 1vw, 0.5rem + 2.5vw, 1rem + 1vw);
  --NormalFont: clamp(0.35rem, 0.6rem + 1vw, 1.25rem);
  --SmallFont: clamp(0.25rem, 0.4rem + 0.5vw, 1rem);

  --NormalFamilyFont: "Noto Sans Mono", monospace;
  --JapaneseFontFamily: "Kosugi Maru", sans-serif;
  ;
}

.dark-theme {
  --Red: rgb(196, 64, 64);
  --Gray: rgb(222, 222, 222);
  --DarkGray: rgb(206, 206, 206);
  --LightGray: rgb(45, 45, 45);
  --White: rgb(29, 29, 29);
  transition: all 0.3s ease;
}