:root {
  --bg: #f4f4f4;
  --text: #222;
  --card-bg: #fff;
  --accent: teal;
}

body.dark {
  --bg: #121212;
  --text: #f0f0f0;
  --card-bg: #1e1e1e;
  --accent: #66d9ef;
}

body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  transition: 0.3s;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--card-bg);
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header h1 {
  margin: 0;
}

.controls {
  display: flex;
  gap: 0.5rem;
}

main {
  padding: 2rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  transition: transform 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.card:hover {
  transform: scale(1.03);
}

.card .icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.card h2 {
  margin: 0.5rem 0 0.25rem;
}

.card a {
  margin-top: auto;
  text-decoration: none;
  color: white;
  background: var(--accent);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  margin-top: 1rem;
}

.add-card {
  cursor: pointer;
  border: 2px dashed var(--accent);
}


/* === Načítací kolečko === */
#loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 15.5s ;
}

.spinner {
  border: 6px solid #ccc;
  border-top: 6px solid var(--accent);
  border-radius: 50%;
  width: 60px;
  height: 60px;
  animation: spin 0.95s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* === Styl pro přepínač === */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #888;
  transition: 0.4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--accent);
}

input:checked + .slider:before {
  transform: translateX(22px);
}