.btn {
        display: inline-block;
        padding: 15px 40px;
        font-size: 1.2em;
        color: white;
        background: #007bff;
        border: none;
        border-radius: 8px;
        cursor: pointer;
        text-decoration: none;
    }
    .btn:hover {
        background: #0056b3;
    }
    
    
:root {
  --bg-dark: #111;
  --text-dark: #eee;
  --card-bg-dark: #1b1b1b;
  --accent: #4caf50;
}





form {
    background: grey;
    padding: 20px;
    border-radius: 8px;
    display: inline-block;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
input[type="email"] {
    padding: 10px;
    width: 250px;
    border-radius: 4px;
    border: 1px solid #ccc;
    margin-right: 10px;
}
input[type="submit"] {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    background: darkgrey;
    color: white;
    cursor: pointer;
}
input[type="submit"]:hover {
    background: #0056b3;
}

.checkbox-group {
    margin-top: 15px;
    text-align: left;
    color: white;
}

.checkbox-group label {
    display: block;
    margin: 5px 0;
}





body {
  font-family: 'Roboto', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-dark);
  margin: 0;
  padding: 0;
}

header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 15px;
  background-color: var(--card-bg-dark);
}

nav {
  display: flex;
  justify-content: center;
  background-color: #222;
  z-index: 100;
}

nav button {
  background: none;
  border: none;
  color: var(--text-dark);
  padding: 12px 20px;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background 0.3s;
}

nav button.active,
nav button:hover {
  background-color: var(--accent);
  color: #000;
  border-radius: 6px;
}

main {
  padding: 20px;
  min-height: 80vh;
  text-align: center;
}

/* --- Dashboard / karty --- */
.kp-center {
  width: 320px;
  margin: 0 auto 25px auto;
  padding: 15px;
  border-radius: 12px;
  background-color: var(--card-bg-dark);
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
  text-align: center;
}

.kp-center .value {
  font-size: 2.2rem;
  font-weight: bold;
  display: block;
  margin-top: 5px;
}

.kp-center .label {
  font-size: 1rem;
  opacity: 0.8;
}

.cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.card {
  width: 320px;
  padding: 15px;
  border-radius: 12px;
  background-color: var(--card-bg-dark);
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
  text-align: center;
  position: relative;
}

.card canvas {
  width: 100% !important;
  height: 150px !important;
}

.value {
  font-size: 2rem;
  font-weight: bold;
  text-align: center;
  margin: 10px 0;
}

.label {
  font-size: 1rem;
  opacity: 0.8;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.info-icon {
  cursor: pointer;
  font-style: normal;
  background: #444;
  border-radius: 50%;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 12px;
}

/* --- Flares tabulka --- */
#flareTable td, #latestTable td, #flareTable th, #latestTable th, #weeklyMaxTable th, #weeklyMaxTable td, #dailyMaxTable th, #dailyMaxTable td {
  border: 1px solid #444;
  padding: 6px 12px;
}

#flareTable, #latestTable, #weeklyMaxTable, #dailyMaxTable {
  border-collapse: collapse;
  margin-bottom: 20px;
  width: 90%;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.flare-C { color: #00aa00; font-weight: bold; }
.flare-M { color: #ffb84d; font-weight: bold; }
.flare-X { color: #ff0000; font-weight: bold; }






/* --- KP tabulka --- */
#kpTable {
  width: 100%;
  max-width: 600px;
  margin: 20px auto;
  border-collapse: collapse;
  background: #1b1b1b;
  color: #eee;
}

#kpTable th, #kpTable td {
  border: 1px solid #555;
  padding: 8px;
  text-align: center;
}

#kpTable th {
  background: transparent;
  color: inherit;
}

/* --- KP 27denní tabulka --- */
#kp27Table {
  width: 100%;
  max-width: 600px;
  margin: 20px auto;
  border-collapse: collapse;
  background: #1b1b1b;
  color: #eee;
}

#kp27Table th, #kp27Table td {
  border: 1px solid #555;
  padding: 8px;
  text-align: center;
}

#kp27Table th {
  background: transparent;
  color: inherit;
}





/* --- Mobilní styl --- */
@media (max-width: 600px) {
  /* Cards na mobilu */
  .cards {
    flex-direction: column;
    align-items: center;
  }

  /* Fixní menu dole */
  nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    background-color: var(--card-bg-dark);
    padding: 5px 0;
    box-shadow: 0 -2px 6px rgba(0,0,0,0.5);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: flex-start;
  }

  nav button {
    display: inline-flex !important;
    flex: 0 0 auto;
    margin: 0 4px;
    height: 60px;
    padding: 6px 8px;
    font-size: 13px;
    white-space: nowrap;
    align-items: center;
    gap: 4px;
  }

  body {
    padding-bottom: 50px; /* prostor pro fixní menu */
  }
}