:root {
  --dark-100: rgb(0, 0, 0, 1);
  --light-100: rgba(255, 255, 255, 1);
  --dark-70: rgb(0, 0, 0, 0.7);
  --light-70: rgba(255, 255, 255, 0.7);
  --dark-50: rgb(0, 0, 0, 0.5);
  --light-50: rgba(255, 255, 255, 0.5);
  --fg-flash-info: rgb(0, 64, 128, 0.7);
  --bg-flash-info: rgb(230, 240, 255, 0.7);
  --fg-flash-success: rgb(224, 255, 224, 0.7);
  --bg-flash-success: rgb(0, 102, 0, 0.7);
  --fg-flash-warning: rgb(255, 224, 224, 0.7);
  --bg-flash-warning: rgb(40, 0, 0, 0.7);
  --fg-flash-error: rgb(255, 248, 224, 0.7);
  --bg-flash-error: rgb(102, 85, 0, 0.7);
  --info-bg: #e6f0ff;
  --info-color: #004080;
  --info-border: #b3d1ff;

  --success-bg: #e6ffea;
  --success-color: #207544;
  --success-border: #a1e2b5;

  --warning-bg: #fff8e1;
  --warning-color: #8a6d00;
  --warning-border: #ffe28a;

  --error-bg: #ffe6e6;
  --error-color: #a00000;
  --error-border: #ffb3b3;
  background-color: var(--light-100);
  color: var(--dark-70);
}

.flash-info {
  background-color: var(--bg-flash-info);
  color: var(--fg-flash-info);
}

.flash-success {
  background-color: var(--bg-flash-success);
  color: var(--fg-flash-success);
}

.flash-warning {
  background-color: var(--bg-flash-warning);
  color: var(--fg-flash-warning);
}

.flash-error {
  background-color: var(--bg-flash-error);
  color: var(--fg-flash-error);
}

@media (prefers-color-scheme: dark) {
  :root {
    --info-bg: #1e293b;
    --info-color: #93c5fd;
    --info-border: #3b82f6;

    --success-bg: #1f2f23;
    --success-color: #7ee087;
    --success-border: #32d16f;

    --warning-bg: #332f1a;
    --warning-color: #ffd166;
    --warning-border: #facc15;

    --error-bg: #3b1e1e;
    --error-color: #f87171;
    --error-border: #ef4444;
  }
}

.flash {
  position: relative;
  margin: 1em auto;
  padding: 1em 2em 1em 3em;
  border-radius: 5px;
  border-left: 5px solid;
  font-family: sans-serif;
  font-size: 1rem;
  width: fit-content;
  min-width: 300px;
  max-width: 600px;
  opacity: 0;
  animation: fadeIn 0.5s forwards;
  transition: background-color 0.2s, color 0.2s;
}

.flash-info    {
  background: var(--info-bg);
  color: var(--info-color);
  border-color: var(--info-border);
}

.flash-success {
  background: var(--success-bg);
  color: var(--success-color);
  border-color: var(--success-border);
}

.flash-warning {
  background: var(--warning-bg);
  color: var(--warning-color);
  border-color: var(--warning-border);
}

.flash-error   {
  background: var(--error-bg);
  color: var(--error-color);
  border-color: var(--error-border);
}

.flash:hover {
  filter: brightness(1.05);
  cursor: pointer;
}

.flash-icon {
  position: absolute;
  left: 0.8em;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3em;
}

.flash-close {
  position: absolute;
  top: 0.4em;
  right: 0.6em;
  font-size: 2rem;
  color: inherit;
  border: none;
  background: transparent;
  cursor: pointer;
  opacity: 0.6;
}

.flash-close:hover {
  opacity: 1.0;
}

@keyframes fadeIn {
  to { opacity: 1; }
}

@keyframes fadeOut {
  to { opacity: 0; transform: scale(0.95); }
}

hr {
  border-color: var(--dark-70);
}

a {
  text-decoration: none;
  font-weight: bold;
  color: var(--dark-70);
}

header {
  border-color: var(--dark-70);
  font-weight: bold;
}

a:hover {
  background-color: var(--dark-100);
  color: var(--light-100);
}

.menu-horizontal a:hover {
  border-color: var(--dark-100);
  background-color: var(--dark-100);
  color: rgba(--dark-100);
}