:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --blue-color: #3b82f6;
    --blue-hover: #2563eb;
    --green-color: #22c55e;
    --green-hover: #16a34a;
    --teal-color: #14b8a6;
    --teal-hover: #0d9488;
    --red-color: #ef4444;
    --green-light-bg: #f0fdf4;
    --red-light-bg: #fef2f2;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --white-color: #ffffff;
    --border-radius: 0.5rem;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font-family);
    background-color: var(--gray-100);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.hidden { display: none !important; }
.container {
    width: 100%;
    max-width: 1200px;
    margin: 1.5rem auto;
    padding: 1.5rem;
}
@media (min-width: 768px) { .container { padding: 2rem; } }
.card {
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}
.main-title {
    font-size: 1.875rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--gray-800);
}
@media (min-width: 768px) { .main-title { font-size: 2.25rem; } }
.disclaimer {
    font-size: 0.9rem;
    color: var(--gray-500);
    text-align: center;
    padding: 0.75rem 1rem;
    background-color: var(--gray-50);
    border-radius: 0.375rem;
    margin: 0 0 1.5rem 0;
    line-height: 1.5;
}
.config-form {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    background-color: var(--gray-50);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
    margin-bottom: 2rem;
}
@media (min-width: 768px) { .config-form { grid-template-columns: repeat(3, 1fr); align-items: end; } }
.form-group { display: flex; flex-direction: column; }
.form-group label, .radio-group-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}
.form-group input, .form-group select {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.25);
}
.radio-group {
    grid-column: 1 / -1;
}
.radio-options {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 1.5rem;
}
.radio-options label {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    font-size: 0.9rem;
}
.radio-options input[type="radio"] { margin-right: 0.5rem; }
.button-group {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin-top: 1rem;
}
@media (min-width: 640px) { .button-group { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .button-group { grid-template-columns: repeat(4, 1fr); } }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    color: var(--white-color);
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background-color: var(--primary-color); }
.btn-primary:hover { background-color: var(--primary-hover); }
.btn-blue { background-color: var(--blue-color); }
.btn-blue:hover { background-color: var(--blue-hover); }
.btn-green { background-color: var(--green-color); }
.btn-green:hover { background-color: var(--green-hover); }
.btn-teal { background-color: var(--teal-color); }
.btn-teal:hover { background-color: var(--teal-hover); }
#quiz-title {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--gray-800);
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--gray-200);
}
#result-summary {
    text-align: center;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 1.5rem;
    padding: 0.75rem;
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
}
#quiz-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem 2.5rem;
    padding: 1.5rem;
    border: 2px dashed var(--gray-200);
    border-radius: var(--border-radius);
    min-height: 200px;
    background-color: var(--gray-50);
}
.question-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    flex-grow: 1;
    font-size: 1.1rem;
}
.answer-input {
    width: 6ch;
    padding: 4px 8px;
    border: none;
    border-bottom: 1.5px solid var(--gray-300);
    font-size: 1rem;
    background-color: transparent;
    text-align: center;
    -moz-appearance: textfield;
    transition: all 0.2s ease;
}
.answer-input:focus {
    border-color: var(--primary-color);
    outline: none;
}
.answer-input.correct { border-color: var(--green-color); background-color: var(--green-light-bg); }
.answer-input.incorrect { border-color: var(--red-color); background-color: var(--red-light-bg); }
.answer-input::-webkit-outer-spin-button, .answer-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.feedback-icon { margin-left: 0.5rem; font-size: 1.2rem; }
.correct-icon { color: var(--green-color); }
.incorrect-icon { color: var(--red-color); }
.correct-answer { color: var(--green-color); font-weight: bold; margin-left: 0.5rem; font-size: 0.9rem; padding: 2px 6px; background-color: var(--green-light-bg); border-radius: 4px; user-select: none; }
@media (min-width: 1024px) {
    .question-item.per-row-4 { flex-basis: calc(25% - 2.5rem * 3 / 4); }
    .question-item.per-row-3 { flex-basis: calc(33.333% - 2.5rem * 2 / 3); }
    .question-item.per-row-2 { flex-basis: calc(50% - 2.5rem * 1 / 2); }
}
@media (min-width: 768px) and (max-width: 1023px) {
    .question-item.per-row-4, .question-item.per-row-3 { flex-basis: calc(33.333% - 2.5rem * 2 / 3); }
    .question-item.per-row-2 { flex-basis: calc(50% - 2.5rem * 1 / 2); }
}
@media (max-width: 767px) { .question-item { flex-basis: 100%; } }

@media print {
    @page { size: A4; margin: 8mm; }
    body, html { background-color: white !important; color: black !important; margin: 0; padding: 0; }
    .no-print, footer, #back-to-top, #dynamic-print-style { display: none !important; }
    .container { margin: 0 !important; padding: 0 !important; width: 100% !important; max-width: 100% !important; box-shadow: none !important; border: none !important; background-color: transparent !important; }
    #quiz-title { font-size: 16pt !important; text-align: center !important; margin-bottom: 10pt !important; font-weight: bold !important; border: none !important; }
    #quiz-container {
        font-size: 11pt !important;
        display: flex !important;
        flex-wrap: wrap !important;
        gap: 12px 24px !important;
        padding: 5pt !important;
        border: none !important;
        width: 100% !important;
        margin: 0 !important;
        min-height: auto !important;
        background: transparent !important;
    }
    .question-item {
        display: inline-flex !important;
        align-items: center !important;
        gap: 8px !important;
        flex: 0 0 calc(50% - 12px) !important;
    }
    @media print and (min-width: 600px) {
        .question-item {
            flex: 0 0 calc(33.333% - 16px) !important;
        }
    }
    @media print and (min-width: 800px) {
        .question-item {
            flex: 0 0 calc(25% - 18px) !important;
        }
    }

    .answer-input {
        width: 10ch !important;
        min-width: 50px !important;
        border-bottom: 1.5px solid #000 !important;
        font-size: 11pt !important;
        padding: 0 4px !important;
        color: #000 !important;
        border-top: none !important;
        border-left: none !important;
        border-right: none !important;
        background: transparent !important;
        box-sizing: border-box !important;
    }
    .feedback-icon, .correct-answer, #result-summary { display: none !important; }
}
footer {
    background-color: #f1f5f9;
    padding: 2rem 1rem;
    margin-top: auto;
    border-top: 1px solid #e2e8f0;
    font-size: 0.9rem;
    color: #475569;
}
.footer-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1fr; gap: 2rem; }
@media (min-width: 768px) { .footer-container { grid-template-columns: 2fr 1fr 1fr; } }
.footer-section h3 { font-size: 1.1rem; font-weight: 600; color: #1e293b; margin-bottom: 1rem; }
.footer-section ul { list-style: none; }
.footer-section li { margin-bottom: 0.5rem; }
.footer-section a { color: var(--primary-color); text-decoration: none; transition: color 0.2s; }
.footer-section a:hover { color: var(--primary-hover); text-decoration: underline; }
.copyright { text-align: center; padding-top: 2rem; margin-top: 2rem; border-top: 1px solid #e2e8f0; font-size: 0.85rem; }
#back-to-top {
    position: fixed; bottom: 30px; right: 30px; background-color: var(--primary-color); color: white; width: 45px; height: 45px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 20px; cursor: pointer; box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3); transition: all 0.3s; opacity: 0; transform: translateY(20px); z-index: 1000;
}
#back-to-top:hover { background-color: var(--primary-hover); transform: translateY(-3px); }
#back-to-top.visible { opacity: 1; transform: translateY(0); }

.language-links {
    margin-bottom: 1.5rem;
    text-align: left;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--gray-700);
    padding: 0.75rem 1rem;
    background-color: var(--gray-50);
    border-radius: 0.375rem;
    border: 1px solid var(--gray-200);
    align-items: center;
}

.language-links span {
    font-weight: 500;
    margin-right: 0.5rem;
    white-space: nowrap;
}

.language-links a {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border: 1px solid var(--gray-300);
    border-radius: 0.3rem;
    text-decoration: none;
    color: var(--gray-700);
    background-color: var(--white-color);
    transition: all 0.2s ease-in-out;
    white-space: nowrap;
}

.language-links a:hover {
    background-color: var(--primary-color);
    color: var(--white-color);
    border-color: var(--primary-color);
}

.language-links a.active {
    background-color: var(--primary-color);
    color: var(--white-color);
    border-color: var(--primary-color);
    font-weight: 600;
}