body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #000a1a; /* Sehr dunkles Blau/Schwarz */
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.app-container {
    width: 100%;
    max-width: 500px;
    text-align: center;
    padding: 20px;
}

header h1 {
    font-weight: 300;
    margin-bottom: 30px;
    color: #fcd116; /* Kolumbianisches Gelb */
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.filter-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.filter-btn {
    background-color: #1a2a4a;
    color: #fcd116;
    border: 1px solid #fcd116;
    padding: 6px 12px;
    border-radius: 15px;
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.3s ease;
    font-weight: 600;
}

.filter-btn.active {
    background-color: #fcd116;
    color: #000;
    box-shadow: 0 0 10px rgba(252, 209, 22, 0.4);
}

.filter-btn.inactive {
    background-color: #333;
    color: #777;
    border-color: #555;
    filter: grayscale(1);
    opacity: 0.6;
}

.card {
    background-color: #1a2a4a; /* Dunkleres Blau */
    border-radius: 24px;
    padding: 40px;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: 0 15px 35px rgba(0,0,0,0.6);
    margin-bottom: 30px;
    border: 2px solid #fcd116; /* Gelber Rahmen */
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
    cursor: pointer;
}

.card:active {
    transform: scale(0.98);
    box-shadow: 0 5px 15px rgba(0,0,0,0.8);
}

.category {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: #ff353c; /* Kolumbianisches Rot */
    margin-bottom: 20px;
    font-weight: bold;
}

#question-text {
    font-size: 1.5rem;
    line-height: 1.5;
    margin: 0;
    color: #ffffff;
    font-weight: 400;
}

.next-button {
    background-color: #fcd116;
    color: #000;
    border: none;
    padding: 16px 32px;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 700;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(252, 209, 22, 0.3);
}

.next-button:hover {
    background-color: #e6be14;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(252, 209, 22, 0.4);
}

.next-button:active {
    transform: scale(0.95);
}