:root {
  color-scheme: light dark;

  --border-width: 1px;
  --border-color: light-dark(#ccc, #666);
  --border-radius-l: 12px;
  --border-radius-m: 8px;
  --border-radius-s: 4px;

  --text-color: light-dark(#333, #ccc);
  --sub-text-color: light-dark(#666, #999);
  --bg-color: light-dark(#f0f0f0, #333);
  --tile-bg-color: light-dark(#fff, #444);
  --primary-accent-color: #007bff;
  --secondary-accent-color: #fd9a4e;
  --red-color: #dc3545;
  --green-color: #28a745;
  --yellow-color: #ffc107;
  --blue-color: #007bff;
  --purple-color: #6f42c1;
  --h1-size: 2rem;
}

body {
  font-family: sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  row-gap: 1vh;
  justify-content: center;
  align-items: center;
  margin: 0;
  padding: 1rem;
  /* 縦中央用 */
  /* min-height: 100vh; */
}

.hidden {
  display: none;
}

.tile {
  background-color: var(--tile-bg-color);
  width: 100%;
  max-width: 50rem;
  padding: 1.5rem 0.5rem;
  /* margin: 0 0.5rem 0 0.5rem; */
  border-radius: var(--border-radius-m);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.svg-icon {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

span .svg-icon,
p .svg-icon,
a .svg-icon,
button .svg-icon {
  display: inline-flex;
  width: 1rem;
  height: 1rem;
  vertical-align: middle;
}

h1 {
  font-size: var(--h1-size);
  line-height: var(--h1-size);
}

h1 .svg-icon {
  display: inline-flex;
  width: 2rem;
  height: 2rem;
  vertical-align: middle;
}

.form-control {
  display: inline-flex;
  flex-direction: column;
  vertical-align: text-bottom;
}

.form-control .label {
  display: flex;
  flex-direction: row;
  font-size: 0.75rem;
}

.form-control .label label {
  flex: 1;
  text-align: left;
  vertical-align: text-bottom;
}

.form-control .label .label-icon {
  flex: 0 0 auto;
  vertical-align: text-bottom;
}

.form-control input,
.form-control button {
  display: inline-flex;
  padding: 0.5rem;
  line-height: 1rem;
  vertical-align: text-bottom;
  border-style: solid;
  border-color: var(--border-color);
  border-width: var(--border-width);
  border-radius: var(--border-radius-s);
}

.form-control input {
  height: 1rem;
}

button {
  /* padding: 0.5rem 1rem; */
  border: none;
  border-radius: var(--border-radius-s);
  background-color: var(--primary-accent-color);
  color: #fff;
  cursor: pointer;
}

button:hover {
  filter: brightness(120%);
  /* background-color: #0056b3; */
  /* background: linear-gradient(45deg, var(--primary-accent-color), blue); */
  /* background: linear-gradient(
    45deg,
    rgb(from var(--primary-accent-color) r g b / 0.9),
    rgb(from var(--primary-accent-color) r g b / 0.8),
    rgb(from currentColor r g b / 0.8)
  ); */
}

#header-tile {
  padding: 0.25rem;
  border: none;
  box-shadow: none;
  background-color: transparent;
}

#footer-tile {
  padding: 0.25rem;
  border: none;
  box-shadow: none;
  background-color: transparent;
}

#summary-title {
  font-size: 1.25rem;
  font-weight: bold;
  color: #007bff;
}

.summary-days-number {
  font-size: 3rem;
  font-weight: bold;
  color: #007bff;
}

#dates {
  list-style-type: none;
  padding: 0;
}

#dates li {
  /* background-color: #f9f9f9; */
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-s);
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#dates li button {
  font-size: 0.8rem;
  padding: 0.25rem 0.5rem;
  margin-left: 0.25rem;
}

#dates li .select-btn {
  background-color: #6c757d;
}

#dates li .select-btn:hover {
  background-color: #5a6268;
}

#dates li .delete-btn {
  background-color: #dc3545;
}

#dates li .delete-btn:hover {
  background-color: #c82333;
}