/* TŁO ANIMOWANE */
body {
    margin: 0;
    padding: 0;
    font-family: "Arial", sans-serif;
    overflow: hidden;
    background: linear-gradient(120deg, #13BAF8, #13BAF8, #13BAF8);
    background-size: 300% 300%;
    animation: gradientMove 12s ease infinite;
    color: #003a60;
}

/* ANIMACJA TŁA */
@keyframes gradientMove {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* PRZYCIEMNIENIE */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.3);
    backdrop-filter: blur(3px);
}

/* GŁÓWNA ZAWARTOŚĆ */
.content {
    position: relative;
    z-index: 2;
    text-align: center;
    margin-top: 100px;
    opacity: 0;
    transform: translateY(30px);
    transition: 1.2s ease;
}

/* LOGO */
.logo {
    width: 180px;
    filter: drop-shadow(0 0 10px rgba(0,0,0,0.2));
    margin-bottom: 20px;
}

/* TYTUŁ */
h1 {
    font-size: 3.5em;
    margin: 0;
}

/* PODTYTUŁ */
.subtitle {
    font-size: 1.4em;
    margin-bottom: 40px;
}

/* KARTY */
.cards {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.card {
    background: rgba(255,255,255,0.55);
    padding: 20px 30px;
    border-radius: 20px;
    width: 250px;
    text-decoration: none;
    color: #003a60;
    transition: 0.3s;
    box-shadow: 0 0 15px rgba(0,0,0,0.15);
}

.card:hover {
    transform: translateY(-8px);
    background: rgba(255,255,255,0.75);
}

/* LOADER */
.loader {
    margin: 40px auto;
    border: 6px solid #ffffff;
    border-top: 6px solid #0099ff;
    border-radius: 50%;
    width: 70px;
    height: 70px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}