/* --- CONFIGURACIÓN GENERAL Y VARIABLES --- */
:root {
    --bg-color: #f4f7f9;
    --surface-color: #ffffff;
    --primary-text-color: #1a202c;
    --secondary-text-color: #718096;
    --accent-color: #128268; 
    --accent-color-hover: #0e6854; 
    --correct-color: #38a169;
    --incorrect-color: #e53e3e;
    --border-color: #e2e8f0;
    --font-family: 'Inter', sans-serif;
    --shadow-sm: 0 1px 3px 0 rgba(0,0,0,0.05), 0 1px 2px 0 rgba(0,0,0,0.03);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.02);
    --transition-speed: 0.3s;
}

html {
    font-size: 80%; 
}

body.dark-mode {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --primary-text-color: #edf2f7;
    --secondary-text-color: #a0aec0;
    --border-color: #2d2d2d;
    --shadow-sm: 0 1px 3px 0 rgba(0,0,0,0.2), 0 1px 2px 0 rgba(0,0,0,0.15);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.2), 0 2px 4px -1px rgba(0,0,0,0.15);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.2), 0 4px 6px -2px rgba(0,0,0,0.17);
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--primary-text-color);
    display: flex;
    min-height: 100vh;
    margin: 0;
    padding: 1rem;
    box-sizing: border-box;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.container {
    background-color: var(--surface-color);
    padding: 2.5rem 3rem;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 1100px;
    text-align: center;
    transition: background-color var(--transition-speed);
    margin: auto;
}

.theme-toggle {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    z-index: 2000;
}
.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    border-color: var(--accent-color);
}
.theme-toggle svg {
    width: 24px;
    height: 24px;
    color: var(--primary-text-color);
    transition: color var(--transition-speed);
}

.screen { display: none; animation: fadeIn 0.5s ease-in-out; }
.screen.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.main-title { font-size: 2.25rem; font-weight: 700; margin-bottom: 0.5rem; border-bottom: none; color: var(--primary-text-color); }
.subtitle { font-size: 1.125rem; color: var(--secondary-text-color); margin-top: 0; margin-bottom: 2.5rem; }
h2 { font-size: 1.5rem; margin-bottom: 1rem; text-align: left; border-bottom: 1px solid var(--border-color); color: var(--primary-text-color); }
h3 { font-size: 1.25rem; text-align: left; margin-bottom: 1rem; border-bottom: none; color: var(--primary-text-color); }

.btn { border: none; padding: 12px 28px; border-radius: 8px; cursor: pointer; font-size: 1rem; font-weight: 500; margin: 8px; transition: all 0.2s ease; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; justify-content: center; }
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn.primary-btn { background-color: var(--accent-color); color: white; }
.btn.primary-btn:hover { background-color: var(--accent-color-hover); }
.btn.secondary-btn { background-color: var(--surface-color); color: var(--primary-text-color); border: 1px solid var(--border-color); box-shadow: var(--shadow-sm); }
body.light-mode .btn.secondary-btn:hover { background-color: #f7fafc; }
body.dark-mode .btn.secondary-btn { background-color: #4a5568; }
body.dark-mode .btn.secondary-btn:hover { background-color: #2d3748; }

#hud { display: flex; justify-content: flex-end; margin-bottom: 1.5rem; font-size: 1rem; font-weight: 500; color: var(--secondary-text-color); }
.question-item { background-color: var(--surface-color); border: 1px solid var(--border-color); border-radius: 12px; padding: 1.5rem; margin-bottom: 2rem; text-align: left; transition: background-color var(--transition-speed); }
.question-item h3 { font-weight: 500; }
.question-item img { max-width: 100%; height: auto; max-height: 250px; margin: 1rem 0; border-radius: 8px; cursor: zoom-in; }
.question-item .answers-list { list-style-type: none; padding: 0; margin-top: 1.5rem; }
.question-item .answers-list li { margin-bottom: 10px; }
.question-item .answers-list label { display: flex; align-items: center; padding: 14px; border-radius: 8px; border: 1px solid var(--border-color); cursor: pointer; transition: all 0.2s ease; background-color: var(--bg-color); }
.question-item .answers-list label:hover { border-color: var(--accent-color); background-color: var(--surface-color); }
.question-item .answers-list input[type="radio"] { display: none; }
.question-item .answers-list .custom-radio { width: 20px; height: 20px; border: 2px solid var(--border-color); border-radius: 50%; margin-right: 12px; display: flex; align-items: center; justify-content: center; transition: all 0.2s ease; flex-shrink: 0; }
.question-item .answers-list .custom-radio .dot { width: 10px; height: 10px; background-color: var(--accent-color); border-radius: 50%; transform: scale(0); transition: transform 0.2s ease-in-out; }
.question-item .answers-list input[type="radio"]:checked + .custom-radio { border-color: var(--accent-color); }
.question-item .answers-list input[type="radio"]:checked + .custom-radio .dot { transform: scale(1); }
.result-marker { margin-left: auto; font-weight: 700; font-size: 0.8rem; padding: 4px 8px; border-radius: 16px; display: none; background: none; }
.result-marker.correct { color: var(--correct-color); text-shadow: 0 0 8px rgba(56, 161, 105, 0.7); }
.result-marker.incorrect { color: var(--incorrect-color); text-shadow: 0 0 8px rgba(229, 62, 62, 0.7); }
.question-item.answered .answers-list input[type="radio"]:checked + .custom-radio + span + .result-marker { display: inline-block; }

#final-summary { display: flex; justify-content: space-between; align-items: center; background-color: var(--bg-color); border: 1px solid var(--border-color); border-radius: 12px; padding: 1rem 1.5rem; margin-top: 2rem; }
#final-summary .summary-score { font-size: 1.1rem; font-weight: 500; color: var(--secondary-text-color); }
#final-summary .summary-status { font-size: 1.2rem; font-weight: 700; padding: 10px 20px; border-radius: 8px; margin: 0; background: none; }
#final-summary .summary-status.approved { color: var(--correct-color); text-shadow: 0 0 10px rgba(56, 161, 105, 0.8); }
#final-summary .summary-status.failed { color: var(--incorrect-color); text-shadow: 0 0 10px rgba(229, 62, 62, 0.8); }

.admin-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.admin-header .main-title { margin: 0; }
.admin-header .btn { margin: 0; }
.admin-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; }
.admin-form-container, .admin-list-container { text-align: left; }
.admin-list-container h3 { border-bottom: 1px solid var(--border-color); padding-bottom: 0.5rem; }
#question-form { display: flex; flex-direction: column; gap: 1.25rem; }
textarea, input[type="text"], input[type="number"] { width: 100%; padding: 12px; border-radius: 8px; border: 1px solid var(--border-color); background-color: var(--bg-color); font-family: var(--font-family); font-size: 1rem; box-sizing: border-box; transition: border-color 0.2s, box-shadow 0.2s; color: var(--primary-text-color); }
textarea:focus, input:focus { outline: none; border-color: var(--accent-color); box-shadow: 0 0 0 3px rgba(18, 130, 104, 0.2); }
.answer-input-container { position: relative; display: flex; align-items: center; gap: 10px; margin-bottom: 10px; margin-right: 40px; }
.answer-input-container input[type="radio"] { display: none; }
.custom-admin-radio { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--border-color); background-color: var(--surface-color); cursor: pointer; display: flex; justify-content: center; align-items: center; flex-shrink: 0; transition: all 0.2s ease; }
.custom-admin-radio::after { content: ''; width: 10px; height: 10px; border-radius: 50%; background-color: var(--accent-color); transform: scale(0); transition: transform 0.2s ease; }
.answer-input-container input[type="radio"]:checked + .custom-admin-radio { border-color: var(--accent-color); }
.answer-input-container input[type="radio"]:checked + .custom-admin-radio::after { transform: scale(1); }
.answer-input-container input[type="text"] { flex-grow: 1; }
.remove-answer-btn { position: absolute; top: 50%; right: -45px; transform: translateY(-50%); background-color: #3c3c3c; border: 1px solid #555; color: #f87171; width: 32px; height: 32px; border-radius: 8px; display: flex; align-items: center; justify-content: center; padding: 0; cursor: pointer; transition: background-color 0.2s; }
.remove-answer-btn:hover { background-color: #e53e3e; color: white; border-color: #e53e3e; }
.remove-answer-btn svg { width: 20px; height: 20px; }
#questions-list { list-style-type: none; padding: 0; }
#questions-list li { background-color: var(--bg-color); padding: 12px 16px; margin-bottom: 8px; border-radius: 8px; border: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; transition: background-color 0.2s; }
#questions-list li:hover { background-color: var(--surface-color); }
.action-buttons button { background: none; border: none; font-size: 1.2rem; color: var(--secondary-text-color); cursor: pointer; transition: color 0.2s; padding: 4px; }
.action-buttons button:hover { color: var(--primary-text-color); }
.action-buttons button svg { width: 18px; height: 18px; }

.modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(30, 41, 59, 0.6); justify-content: center; align-items: center; backdrop-filter: blur(5px); }
.modal.active { display: flex; animation: fadeInModalBg 0.3s ease; }
.modal-content { background-color: var(--surface-color); padding: 2rem; border-radius: 16px; width: 90%; max-width: 450px; text-align: center; box-shadow: var(--shadow-lg); animation: zoomInModal 0.3s ease; }
@keyframes fadeInModalBg { from { opacity: 0; } to { opacity: 1; } }
@keyframes zoomInModal { from { transform: scale(0.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.hidden { display: none; }

.modal.image-viewer { background-color: rgba(18, 18, 18, 0.8); backdrop-filter: blur(8px); }
.image-viewer .close-btn { position: absolute; top: 20px; right: 30px; color: white; font-size: 40px; font-weight: bold; background: none; border: none; cursor: pointer; transition: transform 0.2s; }
.image-viewer .close-btn:hover { transform: scale(1.1); color: #ccc; }
.image-viewer .image-content-wrapper { width: 90%; height: 90%; display: flex; justify-content: center; align-items: center; overflow: hidden; }
.image-viewer #image-viewer-img { max-width: 100%; max-height: 100%; object-fit: contain; }

@media (max-width: 768px) {
    html {
        font-size: 75%;
    }
    body {
        padding: 1rem 0.5rem;
    }
    .container {
        padding: 1.5rem;
        max-width: 100%;
    }
    .theme-toggle {
        top: 0.8rem;
        left: 0.8rem;
        width: 40px;
        height: 40px;
    }
    .theme-toggle svg {
        width: 20px;
        height: 20px;
    }
    .admin-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .admin-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    #final-summary {
        flex-direction: column;
        gap: 0.8rem;
        padding: 1rem;
        align-items: stretch;
    }
    #final-summary .summary-score, #final-summary .summary-status {
        text-align: center;
    }
}