/* 确保全屏高度 */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body { 
  padding-top: 0px; 
}

/* 全屏布局支持 */
.min-vh-100 {
  min-height: 100vh !important;
}

.flex-grow-1 {
  flex-grow: 1 !important;
}

.left-aligned { margin-left: auto; }
.bg-dark { background-color: #343a40 !important; }
.bg-hero { background-color: #45b06cff; }

/* CALLOUT */
.bd-callout { padding:1.25rem; margin-top:1.25rem; margin-bottom:1.25rem; border:1px solid #e9ecef; border-left-width:.25rem; border-radius:.25rem }
.bd-callout h4 { margin-bottom: 1.25rem }
.bd-callout p:last-child { margin-bottom:0 }
.bd-callout code { border-radius:.25rem }
.bd-callout+.bd-callout { margin-top:-.25rem }
.bd-callout-info { border-left-color:#5bc0de }
.bd-callout-warning { border-left-color:#f0ad4e }
.bd-callout-danger { border-left-color:#d9534f }

/* footer */
footer a { color: white; font-weight: bold; text-decoration: none; }
footer a:hover { color: white; text-decoration: underline; }