/* SCS Tests - Main Stylesheet */
/* Base font-size: 1rem (16px) */

:root {
    --bg:           #f4f6f9;
    --bg-card:      #ffffff;
    --bg-input:     #ffffff;
    --border:       #d1d9e0;
    --text:         #1a2332;
    --text-muted:   #5a6a7a;
    --accent:       #1a5ea8;
    --accent-hover: #144d8f;
    --accent-light: #e8f0fb;
    --success:      #1a7a4a;
    --success-bg:   #e6f4ed;
    --danger:       #b32d2d;
    --danger-bg:    #fbeaea;
    --warning:      #7a5a00;
    --warning-bg:   #fff8e1;
    --radius:       0.5rem;
    --shadow:       0 1px 4px rgba(0,0,0,0.08);
    --shadow-md:    0 4px 16px rgba(0,0,0,0.10);
    --transition:   0.18s ease;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg:           #0f1923;
        --bg-card:      #1a2535;
        --bg-input:     #243045;
        --border:       #2e3f55;
        --text:         #e2e8f0;
        --text-muted:   #8a9bb0;
        --accent:       #4a90d9;
        --accent-hover: #5fa0e8;
        --accent-light: #1a2e45;
        --success:      #3dba7a;
        --success-bg:   #0d2a1a;
        --danger:       #e05555;
        --danger-bg:    #2a0f0f;
        --warning:      #f0c040;
        --warning-bg:   #2a2000;
        --shadow:       0 1px 4px rgba(0,0,0,0.30);
        --shadow-md:    0 4px 16px rgba(0,0,0,0.40);
    }
}

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

html {
    font-size: 1rem;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'Helvetica Neue', sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    transition: background-color var(--transition), color var(--transition);
}

/* Layout */
.site-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 3.5rem;
}

.site-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.main-content {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.card + .card {
    margin-top: 1.25rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.4;
    cursor: pointer;
    border: 1px solid transparent;
    text-decoration: none;
    transition: background-color var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
    white-space: nowrap;
}

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-input);
    color: var(--text);
    border-color: var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.0625rem;
}

.btn-sm {
    padding: 0.3rem 0.875rem;
    font-size: 0.9375rem;
}

.btn-block {
    width: 100%;
    display: flex;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    margin-bottom: 0.4rem;
    color: var(--text);
}

.form-select,
.form-input {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
    -webkit-appearance: none;
}

.form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235a6a7a' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.875rem center;
    padding-right: 2.5rem;
}

.form-select:focus,
.form-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(74,144,217,0.15);
    outline: none;
}

/* Checkboxes grid */
.temas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.tema-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.5rem 0.625rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color var(--transition), border-color var(--transition);
}

.tema-checkbox:hover {
    background: var(--accent-light);
    border-color: var(--accent);
}

.tema-checkbox input[type="checkbox"] {
    margin-top: 0.2rem;
    accent-color: var(--accent);
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
}

.tema-checkbox span {
    font-size: 0.9375rem;
    line-height: 1.45;
    color: var(--text);
}

.temas-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

/* Toggle group */
.toggle-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.toggle-option {
    position: relative;
}

.toggle-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-option label {
    display: inline-block;
    padding: 0.4rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: background-color var(--transition), border-color var(--transition), color var(--transition);
    background: var(--bg-input);
    color: var(--text-muted);
}

.toggle-option input[type="radio"]:checked + label {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.toggle-option label:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.toggle-option input[type="radio"]:checked + label:hover {
    color: #fff;
}

.toggle-option input[type="radio"]:focus-visible + label {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Question card */
.question-header {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.question-counter {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
}

.question-text {
    font-size: 1.0625rem;
    font-weight: 500;
    line-height: 1.6;
    color: var(--text);
    flex: 1;
}

.answers-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.answer-item {
    position: relative;
}

.answer-item input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.answer-label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1.5;
    transition: background-color var(--transition), border-color var(--transition);
    background: var(--bg-input);
}

.answer-label:hover {
    background: var(--accent-light);
    border-color: var(--accent);
}

.answer-item input[type="radio"]:checked + .answer-label {
    background: var(--accent-light);
    border-color: var(--accent);
    color: var(--accent);
    font-weight: 500;
}

.answer-item input[type="radio"]:focus-visible + .answer-label {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Answer marker (a, b, c...) */
.answer-marker {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    font-size: 0.8125rem;
    font-weight: 700;
    background: var(--border);
    color: var(--text-muted);
    flex-shrink: 0;
    margin-top: 0.05rem;
    transition: background-color var(--transition), color var(--transition);
}

.answer-item input[type="radio"]:checked + .answer-label .answer-marker {
    background: var(--accent);
    color: #fff;
}

/* Correct / wrong states (results) */
.answer-label.correct {
    background: var(--success-bg);
    border-color: var(--success);
    color: var(--success);
}

.answer-label.wrong {
    background: var(--danger-bg);
    border-color: var(--danger);
    color: var(--danger);
}

.answer-label.correct .answer-marker {
    background: var(--success);
    color: #fff;
}

.answer-label.wrong .answer-marker {
    background: var(--danger);
    color: #fff;
}

/* Progress bar */
.progress-bar {
    height: 0.375rem;
    background: var(--border);
    border-radius: 99px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 99px;
    transition: width 0.3s ease;
}

/* Explanation box */
.explanation-box {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-left: 3px solid var(--accent);
    background: var(--accent-light);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 0.9375rem;
    color: var(--text);
    line-height: 1.6;
}

.explanation-label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--accent);
    margin-bottom: 0.25rem;
    display: block;
}

/* Navigation */
.question-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    gap: 1rem;
}

/* Summary / Results */
.score-display {
    text-align: center;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.score-number {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1;
    color: var(--accent);
}

.score-label {
    font-size: 1rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.score-grade {
    font-size: 1.375rem;
    font-weight: 700;
    margin-top: 0.75rem;
}

.grade-excellent { color: var(--success); }
.grade-good      { color: var(--accent); }
.grade-warning   { color: var(--warning); }
.grade-fail      { color: var(--danger); }

.stats-row {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.stat-chip {
    padding: 0.35rem 0.875rem;
    border-radius: 99px;
    font-size: 0.9375rem;
    font-weight: 500;
}

.stat-correct { background: var(--success-bg); color: var(--success); }
.stat-wrong   { background: var(--danger-bg);  color: var(--danger); }
.stat-skipped { background: var(--bg-input);   color: var(--text-muted); border: 1px solid var(--border); }

/* Summary question list */
.summary-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    margin-top: 1rem;
}

.summary-item {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    padding: 0.625rem 0.875rem;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    border: 1px solid var(--border);
}

.summary-item.ok   { background: var(--success-bg); border-color: var(--success); }
.summary-item.bad  { background: var(--danger-bg);  border-color: var(--danger); }
.summary-item.skip { background: var(--bg-input); }

.summary-badge {
    flex-shrink: 0;
    font-size: 0.8125rem;
    font-weight: 700;
    width: 1.75rem;
    text-align: center;
}

.summary-item.ok   .summary-badge { color: var(--success); }
.summary-item.bad  .summary-badge { color: var(--danger); }
.summary-item.skip .summary-badge { color: var(--text-muted); }

.summary-q {
    flex: 1;
    line-height: 1.5;
    color: var(--text);
}

.summary-correct-ans {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    margin-bottom: 1rem;
    border: 1px solid;
}

.alert-warning {
    background: var(--warning-bg);
    border-color: var(--warning);
    color: var(--warning);
}

.alert-info {
    background: var(--accent-light);
    border-color: var(--accent);
    color: var(--accent);
}

/* Divider */
hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1.25rem 0;
}

/* Utility */
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.d-flex { display: flex; }
.gap-1  { gap: 0.5rem; }
.gap-2  { gap: 1rem; }
.flex-wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.w-100 { width: 100%; }

/* Responsive */
@media (max-width: 600px) {
    .main-content {
        padding: 1.25rem 1rem;
    }

    .card {
        padding: 1.125rem;
    }

    .temas-grid {
        grid-template-columns: 1fr;
    }

    .score-number {
        font-size: 2.75rem;
    }

    .question-nav {
        flex-wrap: wrap;
    }

    .btn-lg {
        padding: 0.625rem 1.5rem;
    }
}