/* ------------------------- */
/* --- GENERAL STYLES & VARIABLES --- */
/* ------------------------- */
:root {
    --primary-color: #007aff;
    --primary-hover: #005ecb;
    --accent-color: #ff9500;
    --accent-hover: #e68600;
    --success-color: #34c759;
    --danger-color: #ff3b30;
    --warning-color: #ff9500;
    --background-color: #f2f2f7;
    --card-background: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --border-color: #d1d1d6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --font-main: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

html, body {
    height: 100%;
    width: 100%;
}

body {
    font-family: var(--font-main);
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.5;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ------------------------- */
/* --- MAIN & SCREEN CONTAINERS --- */
/* ------------------------- */

.main-container {
    flex-grow: 1; 
    position: relative;
    display: flex;
}

.screen {
    display: none;
    width: 100%;
    height: 100%;
    justify-content: center;
    align-items: center; 
    opacity: 0;
    transform: scale(0.98);
    transition: opacity 0.3s ease-in-out, transform 0.3s ease-in-out;
}

.screen:not(.hidden) {
    display: flex;
    opacity: 1;
    transform: scale(1);
}

.quiz-container {
    background: var(--card-background);
    border-radius: 20px;
    box-shadow: 0 10px 40px var(--shadow-color);
    width: 100%;
    max-width: 800px;
    padding: 2.5rem 3rem;
    margin: auto; 
    display: flex;
    flex-direction: column;
    max-height: 90vh; 
}

h1, h2, h3 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
    text-align: center;
}

h1 { font-size: 2rem; margin-bottom: 1rem; }
h2 { font-size: 1.8rem; margin-bottom: 2rem; }
h3 { font-size: 1.3rem; margin-bottom: 1.5rem; text-align: left; font-weight: 600; }

/* --- START SCREEN --- */
#start-screen .quiz-container { height: auto; }
.start-content-centered { text-align: center; } 
.start-content-centered p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* --- QUIZ CONTENT & SHARED LAYOUTS --- */
.quiz-body, .overview-content, .result-content, .analysis-content {
    display: flex;
    flex-direction: column;
    width: 100%;
    overflow: hidden; 
    flex-grow: 1; 
    min-height: 0; 
}

/* ESTA ES LA NUEVA REGLA QUE ARREGLA EL SCROLL EN LA PANTALLA DE RESULTADOS */
#result-screen .result-content {
    overflow-y: auto;
    padding-right: 1rem;
    margin-right: -1rem;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    gap: 1rem;
}

#timer, #question-counter {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 10px;
    font-weight: 500;
    white-space: nowrap;
}

#timer {
    min-width: 160px; 
    text-align: center;
}

/* Contenedores con scroll */
#question-container, #analysis-details, .overview-content {
    flex-grow: 1;
    overflow-y: auto; 
    padding-right: 1rem;
    margin-right: -1rem;
    min-height: 0;
}

#question-text { font-size: 1.25rem; font-weight: 500; margin-bottom: 2rem; }

.answer-option { display: flex; align-items: center; padding: 1rem; margin-bottom: 1rem; background-color: #fff; border: 2px solid var(--border-color); border-radius: 12px; cursor: pointer; transition: all 0.2s ease-out; }
.answer-option:hover { border-color: var(--primary-color); background-color: #eaf5ff; }
.answer-option input[type="checkbox"] { margin-right: 1rem; }
.answer-option strong { margin-right: 0.5rem; }
.answer-option input[type="checkbox"] { appearance: none; min-width: 22px; height: 22px; border: 2px solid #aeb8c5; border-radius: 6px; cursor: pointer; transition: all 0.2s ease; position: relative; }
.answer-option input[type="checkbox"]:checked { background-color: var(--primary-color); border-color: var(--primary-color); }
.answer-option input[type="checkbox"]:checked::after { content: '✔'; color: white; font-size: 16px; font-weight: bold; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }

/* --- BUTTONS --- */
.navigation-buttons { display: flex; justify-content: space-between; gap: 1rem; margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border-color); flex-shrink: 0; }
button { padding: 0.8rem 1.5rem; font-size: 0.9rem; font-weight: 600; font-family: var(--font-main); border: none; border-radius: 12px; cursor: pointer; transition: all 0.2s ease; }
button:disabled { background-color: #e0e0e0 !important; color: #a0a0a0 !important; cursor: not-allowed; transform: none !important; box-shadow: none !important; }
.primary-button { background: var(--primary-color); color: white; }
.primary-button:hover:not(:disabled) { background: var(--primary-hover); }
.secondary-button, .header-button { background-color: #e9effa; color: var(--text-secondary); }
.header-button:hover:not(:disabled), .secondary-button:hover:not(:disabled){ background-color: #d8e1ef; }
#bookmark-button { background-color: var(--warning-color); color: white; }
#bookmark-button.bookmarked { background-color: var(--accent-color); color: var(--text-primary); }

/* --- OVERVIEW SCREEN --- */
.overview-section { margin-bottom: 1.5rem; }
.overview-section h3 { border-bottom: 1px solid var(--border-color); padding-bottom: 0.75rem; }
#answered-status-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(45px, 1fr)); gap: 0.75rem; padding-top: 1rem; }
.question-status-box { width: 100%; aspect-ratio: 1 / 1; display: flex; align-items: center; justify-content: center; border: 2px solid var(--border-color); border-radius: 8px; font-weight: 600; cursor: pointer; background-color: white; transition: all 0.2s ease-out; }
.question-status-box:hover { transform: scale(1.05); border-color: var(--primary-color); }
.question-status-box.answered { background-color: #e8f5e9; border-color: var(--success-color); color: #388e3c; }
.question-status-box.bookmarked { outline: 2px solid var(--accent-color); outline-offset: 2px; }
#saved-questions-list { list-style: none; padding-top: 1rem; }
#saved-questions-list li { padding: 0.75rem 1rem; margin-bottom: 0.5rem; background: white; border-radius: 8px; cursor: pointer; font-weight: 500; border: 1px solid var(--border-color); }
#saved-questions-list li:hover { background-color: var(--primary-color); color: white; }
#saved-questions-list li.no-bookmarks { background: transparent; border: none; cursor: default; }
#saved-questions-list li.no-bookmarks:hover { color: var(--text-secondary); }

/* --- RESULT & ANALYSIS SCREENS --- */
#result-screen .quiz-container, #analysis-screen .quiz-container { height: auto; max-height: 90vh; }
.result-summary { text-align: center; margin-bottom: 2rem; }
#percentage { font-size: 3rem; font-weight: bold; color: var(--primary-color); }
#pass-status { font-size: 1.5rem; font-weight: 700; margin-top: 0.5rem; }
#pass-status.passed { color: var(--success-color); }
#pass-status.failed { color: var(--danger-color); }
.result-content > .secondary-button, .result-content > .primary-button { margin-top: 1.5rem; }

#review-container { 
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
    padding-top: 1.5rem;
}
.review-item { padding: 1rem 1.5rem; margin-bottom: 1.5rem; border-radius: 12px; border-left: 5px solid; background-color: white; box-shadow: 0 4px 10px rgba(0,0,0,0.05); }
.review-item.correct { border-color: var(--success-color); }
.review-item.incorrect { border-color: var(--danger-color); }
.review-item.bookmarked-review { box-shadow: 0 0 0 3px var(--warning-color); }
.review-item p { margin-bottom: 0.5rem; }
.review-item b { font-weight: 600; }
.review-item .user-answer, .review-item .correct-answer { display: block; margin-top: 0.5rem; padding: 0.75rem; border-radius: 8px; font-style: normal; line-height: 1.4; background-color: var(--background-color); }
.review-item.incorrect .user-answer { color: var(--danger-color); background-color: rgba(255, 59, 48, 0.1); }
.review-item.correct .user-answer, .review-item .correct-answer { color: #2e7d32; background-color: rgba(52, 199, 89, 0.1); }

/* --- ANALYSIS --- */
#analysis-screen .quiz-container { display: flex; flex-direction: column; overflow: hidden; }
.analysis-content { display: flex; flex-direction: column; min-height: 0; }
#analysis-chart-container { flex-shrink: 0; }
#analysis-details-container { flex-grow: 1; overflow-y: auto; padding-right: 1rem; }
#analysis-chart { display: flex; justify-content: space-around; align-items: flex-end; height: 250px; padding: 1rem; gap: 1.5rem; border-radius: 12px; background-color: #fff; }
.chart-bar-group { flex: 1; display: flex; flex-direction: column-reverse; align-items: center; height: 100%; }
.bar-percentage { font-weight: 600; font-size: 0.9rem; margin-top: 0.5rem; color: var(--text-primary); }
.chart-bar-element { width: 60%; max-width: 45px; border-radius: 6px 6px 0 0; transition: height 0.8s ease-out; background-color: #e0e0e0; }
.bar-label { margin-bottom: 0.75rem; font-size: 0.8rem; font-weight: 500; text-align: center; }

/* --- FOOTER --- */
footer {
    position: static;
    width: 100%;
    padding: 1rem;
    text-align: center;
    background: var(--background-color);
    flex-shrink: 0;
    z-index: auto;
}
footer p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 0.1rem 0;
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    .main-container {
        padding: 0;
    }
    .quiz-container { 
        height: 100%; 
        max-height: 100%; 
        border-radius: 0; 
        padding: 1.5rem; 
    }
    h1 { font-size: 1.5rem; }
    .navigation-buttons { flex-direction: column; gap: 0.75rem; }
}