/* ===== Login Box ===== */

.login-box {

    background: #fff;

    padding: 40px 50px; /* více prostoru uvnitř */

    border-radius: 16px; /* zaoblenější rohy */

    box-shadow: 0 8px 30px rgba(0,0,0,0.15); /* silnější stín */

    width: 100%;

    max-width: 400px;

    margin: 80px auto;

    text-align: center;

    transition: transform 0.3s ease, box-shadow 0.3s ease;

}



.login-box:hover {

    transform: translateY(-5px);

    box-shadow: 0 12px 40px rgba(0,0,0,0.2);

}



.login-box h2 {

    margin-bottom: 25px;

    color: #333;

    font-size: 26px;

    font-weight: 600;

}



/* Inputs */

.login-box input {

    width: 100%;

    padding: 14px;

    margin: 12px 0;

    border: 1px solid #ddd;

    border-radius: 10px;

    font-size: 16px;

    transition: border 0.3s, box-shadow 0.3s;

}



.login-box input:focus {

    border-color: #77A8A8;

    outline: none;

    box-shadow: 0 0 8px rgba(119,168,168,0.3);

}



/* Button */

.login-box button {

    width: 100%;

    padding: 14px;

    background: #77A8A8;

    color: #fff;

    font-size: 16px;

    border: none;

    border-radius: 10px;

    cursor: pointer;

    transition: background 0.3s, color 0.3s, transform 0.2s;

    margin-top: 15px;

}



.login-box button:hover {

    background: #518080;

    color: #fff;

    transform: translateY(-2px);

}





/* ================= HERO BACKGROUND ================= */

body {

  margin: 0;

  font-family: "Segoe UI", Arial, sans-serif;

  background: linear-gradient(-45deg, 

              #E6EBEB, #BFDCDC, #A8CACA, #77A8A8, 

              #E6EBEB, #BFDCDC, #A8CACA, #77A8A8);

  background-size: 400% 400%;

  animation: gradientMove 6s linear infinite;

  min-height: 100vh;

  display: flex;

}



@keyframes gradientMove {

  0% { background-position: 0% 50%; }

  100% { background-position: 100% 50%; }

}



/* ================= LAYOUT ================= */

.container {

  display: flex;

  width: 100%;

}



/* ===== Sidebar ===== */

nav {

  position: fixed; /* bude fixní při scrollu */

  top: 0;          /* začíná od vrchu stránky */

  left: 0;

  width: 260px;

  height: 100vh;   /* celá výška viewportu */

  background: rgba(255,255,255,0.95);

  backdrop-filter: blur(6px);

  display: flex;

  flex-direction: column;

  justify-content: flex-start;

  padding: 20px 0;

  box-shadow: 2px 0 10px rgba(0,0,0,0.1);

  border-right: 2px solid #A8CACA;

  z-index: 999;    /* aby byl nad hlavním obsahem */

}



nav ul {

  list-style: none;

  padding: 0;

  margin: 0;

  flex: 1;

  display: flex;

  flex-direction: column;

  justify-content: space-around;

  height: 100%;

}



nav ul li a {

  display: block;

  width: 100%;

  padding: 18px 20px;

  border-radius: 0 12px 12px 0;

  color: #333;

  font-weight: 500;

  text-decoration: none;

  transition: all 0.3s ease;

}



nav ul li a:hover {

  background: #77A8A8;

  color: #fff;

}



/* Hlavní obsah se posune doprava, aby nebyl pod fixed nav */

.main {

  margin-left: 260px; /* stejná šířka jako sidebar */

  padding: 40px;

  color: #333;

}





/* ================= STATS CARDS ================= */

.stats {

  display: grid;

  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));

  gap: 20px;

  margin-top: 30px;

}



.card {

  background: #fff;

  border-radius: 15px;

  padding: 20px;

  text-align: center;

  box-shadow: 0 4px 12px rgba(0,0,0,0.1);

  transition: transform 0.2s ease;

}



.card:hover {

  transform: translateY(-5px);

}



.card h2 {

  margin-bottom: 10px;

  font-size: 1.2em;

  color: #4b7979;

}



.card p {

  font-size: 1.8em;

  font-weight: bold;

}



/* ================= CHART CARDS ================= */

.chart-card {

  background: #fff;

  border-radius: 15px;

  padding: 25px;

  margin: 20px 0; /* menší mezera, ne moc velká */

  box-shadow: 0 4px 12px rgba(0,0,0,0.1);

}



/* ================= RESPONSIVE ================= */

@media (max-width: 1024px) {

  nav {

    width: 200px;

  }

  .main {

    padding: 20px;

  }

}



@media (max-width: 768px) {

  .container {

    flex-direction: column;

  }

  nav {

    width: 100%;

    height: auto;

    border-right: none;

    display: flex;

  }

  nav ul {

    flex-direction: row;

    justify-content: space-around;

  }

}