:root {
    --page-bg: #0a0a23;
    --card-bg: rgba(0, 0, 0, 0.8);
    --card-border: rgba(74, 222, 128, 0.85);
    --card-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    --text-accent: #86efac;
    --text-muted: #d1fae5;
}

html {
    scroll-behavior: smooth;
}

body {
    background: url('../images/bg.png') center center / cover no-repeat, var(--page-bg);
}

.bg-hero {
    min-height: 100vh;
}

.quiz-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--card-shadow);
    color: var(--text-accent);
    border: 1px solid var(--card-border);
}

.fade-in {
    animation: fadeIn 0.6s ease-in-out;
}

.start-button {
    animation: glowBorder 1.8s infinite;
}

.option-button {
    width: 100%;
    max-width: 100%;
    background: #15803d;
    color: #fff;
    font-weight: 800;
    font-size: 1.125rem;
    padding: 0.75rem 2rem;
    border-radius: 9999px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.28);
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.option-button:hover {
    background: #22c55e;
    transform: translateY(-1px);
}

.option-button:disabled {
    cursor: not-allowed;
}

.form-status {
    display: none;
    margin-top: 1rem;
    font-weight: 600;
}

.form-status.is-visible {
    display: block;
}

.form-status.is-success {
    color: #86efac;
}

.form-status.is-error {
    color: #fca5a5;
}

input:focus,
select:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.25);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes glowBorder {
    0% {
        box-shadow: 0 0 0 rgba(0, 255, 0, 0.5);
    }

    50% {
        box-shadow: 0 0 20px rgba(0, 255, 0, 1);
    }

    100% {
        box-shadow: 0 0 0 rgba(0, 255, 0, 0.5);
    }
}

@media screen and (max-width: 768px) {
    body {
        background: url('../images/bg-mob.png') center center / cover no-repeat, var(--page-bg);
    }

    .quiz-card {
        padding: 1.5rem;
    }
}