:root{
  --bg: #dbe6f3;                 /* jaśniejsze przygaszone tło */
  --primary: #1b4b9b;            /* ciemny niebieski */
  --primary-2: #2a66d2;          /* jaśniejszy gradient */
  --text: #0f1b2c;
  --muted: #5f718a;

  --radius: 14px;
  --btn-radius: 12px;
  --shadow: 0 6px 18px rgba(17, 33, 64, .14);
  --shadow-hover: 0 10px 26px rgba(17, 33, 64, .22);
}

* { box-sizing: border-box; }
html, body { height: 100%; margin:0; }
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);

  /* lekko przygaszone tło z overlayem */
  background: 
    linear-gradient(rgba(20, 35, 60, 0.25), rgba(20, 35, 60, 0.25)), 
    url('ice_cracks_tile_256.png') repeat;
  background-attachment: fixed;
}

.container{
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.hero{
  text-align: center;
  margin-bottom: 20px;
  padding: 16px 24px;
  background: rgba(255,255,255,.55);
  border-radius: var(--radius);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,.3);
  box-shadow: var(--shadow);
}

.footer{
  margin-top: 30px;
  padding: 8px 14px;
  font-size: 13px;
  color: rgba(255,255,255,.9);
  background: rgba(0,0,0,0.3);
  border-radius: 8px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  box-shadow: 0 2px 6px rgba(0,0,0,.25);
}

.footer .brand{
  font-weight: 700;
  color: white;
}

h1{
  margin: 0 0 6px;
  font-weight: 800;
}
.sub{
  margin: 0;
  color: var(--muted);
  font-weight: 600;
}

/* ===== GUZIKI ===== */
.button-container{
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 520px;
}

.button{
  --grad: linear-gradient(135deg, var(--primary) 0%, var(--primary-2) 100%);
  display: block;
  padding: 14px 18px;
  text-align: center;

  color: #fff;
  text-decoration: none;
  font-weight: 700;

  background: var(--grad);
  border-radius: var(--btn-radius);
  border: 1px solid rgba(255,255,255,.25);
  box-shadow: var(--shadow);

  transition: transform .18s ease, box-shadow .18s ease, filter .18s ease;
}

.button:hover{
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  filter: saturate(1.08);
}

.button:active{
  transform: translateY(0);
  box-shadow: var(--shadow);
}

@media (max-width: 600px){
  .button{
    font-size: 16px;
    padding: 14px;
  }
}