:root {
    --background-color: #1a1a1a;
    --surface-color: #2a2a2a;
    --primary-color: #bb86fc;
    --primary-glow: rgba(187, 134, 252, 0.3);
    --text-color: #e0e0e0;
    --subtle-text-color: #a0a0a0;
    --shadow-color: rgba(0, 0, 0, 0.7);
    --noise-url: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMDAiIGhlaWdodD0iMzAwIj48ZmlsdGVyIGlkPSJub2lzZSI+PGZlVHVyYnVsZW5jZSB0eXBlPSJmcmFjdGFsTm9pc2UiIGJhc2VGcmVxdWVuY3k9IjAuOCIgbnVtT2N0YXZlcz0iMyIgc3RpdGNoVGlsZXM9InN0aXRjaCIvPjxmZUNvbXBvbmVudFRyYW5zZmVyPjxGZUNvbXBvbmVudFRyYW5zZmVyPjxmZUZ1bmNBUiB0eXBlPSJsaW5lYXIiIHNsb3BlPSIwLjA4Ii8+PC9mZUNvbXBvbmVudFRyYW5zZmVyPjwvZmlsdGVyPjxyZWN0IHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiIGZpbHRlcj0idXJsKCNub2lzZSkiLz48L3N2Zz4=');
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 2rem;
    overflow-y: scroll;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: var(--noise-url);
    opacity: 0.2;
    pointer-events: none;
    z-index: -1;
}

#app {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.app-header {
    text-align: center;
    border-bottom: 1px solid var(--surface-color);
    padding-bottom: 1.5rem;
}

.app-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.app-header .subtitle {
    font-size: 1.1rem;
    color: var(--subtle-text-color);
    font-style: italic;
}

#quiz-container, #result-container {
    background-color: var(--surface-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 10px 30px var(--shadow-color);
    transition: all 0.3s ease-in-out;
}

.hidden {
    display: none;
}

button {
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    background-color: var(--primary-color);
    color: var(--background-color);
    transition: all 0.2s ease-in-out;
    box-shadow: 0 4px 15px -5px var(--primary-glow);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0px var(--primary-glow);
}

@media (max-width: 640px) {
    body {
        padding: 1rem;
    }

    #app {
        gap: 1.5rem;
    }
    
    .app-header h1 {
        font-size: 2rem;
    }

    .app-header .subtitle {
        font-size: 1rem;
    }

    #quiz-container, #result-container {
        padding: 1.5rem;
    }
}