:root {
  --text-color: #1a1a1a;
  --text-note-color: #666;
  --border-color: #d3d3ca;
  --bg-color: #e6e6e0;
  --bg-card-color: #eaeae5;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text-color: #e6e6e0;
    --text-note-color: #aaa;
    --border-color: #373737;
    --bg-color: #1a1a1a;
    --bg-card-color: #343432;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
    "WenQuanYi Micro Hei", "MiSans L3", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
}

.container {
  max-width: 700px;
  margin: 40px auto 0;
  padding: 0 1rem;
}

/* Header */
header {
  & > .title {
    h1 {
      margin-bottom: 0.5rem;
    }
    #time {
      color: var(--text-note-color);
      margin-bottom: 1rem;
    }
  }
}
.control-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  align-items: stretch;
  gap: 1rem;
}
.group-toggle {
  display: flex;
  border: 1px solid var(--border-color);
  padding: 0.3rem;
  border-radius: var(--radius);
  column-gap: 0.2rem;
}
.group-btn {
  padding: 0.6rem;
  border-radius: calc(var(--radius) - 5px);
  color: var(--text-note-color);
  border: none;
  background: none;
  cursor: pointer;
  text-align: center;
  transition: background 0.1s;
}
.group-btn:hover {
  background-color: var(--border-color);
}
.group-btn.active {
  background-color: var(--text-color);
  color: var(--bg-color);
  font-weight: bold;
}
.mode-toggle .group-btn {
  width: 3.7rem;
}
#prefixSelector {
  min-width: 8rem;
  min-height: 2.5rem;
  padding: 0.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  background: none;
  color: var(--text-color);
  margin: 0;
  padding: 0 1rem;
}

/* main */
.group-container {
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
}
.block-content {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}
.link {
  color: inherit;
  text-decoration: none;
  display: flex;
  align-items: center;
  column-gap: 0.5rem;
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  border: 1px solid var(--border-color);
  &.disabled {
    pointer-events: none;
    opacity: 0.5;
  }

  & > svg {
    width: 34px;
    height: 34px;
  }
  & > .info {
    display: flex;
    flex-direction: column;
    row-gap: 0.1rem;

    & > .title {
      font-weight: bold;
    }
    & > .desc {
      color: var(--text-note-color);
      font-size: smaller;
    }
  }
}

/* footer */
footer {
  margin-top: 2rem;
  padding: 1rem;

  & > .footer-content {
    text-align: center;
    color: var(--text-note-color);
    max-width: 700px;
    margin: 0 auto;
  }
}

/* responsive */
@media (min-width: 768px) {
  header {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
}
@media (max-width: 450px) {
  #prefixSelector {
    width: 100%;
    margin-top: 0.5rem;
  }
}