/* ExamRobotic — quiz interface */

:root {
    --er-dark:    #0b2040;
    --er-blue:    #1a6fd4;
    --er-bg:      #f9fafb;
    --er-border:  #d1dce5;
    --er-green:   #10b981;
    --er-red:     #ef4444;
    --er-amber:   #f59e0b;
    --primary:    #1a6fd4;
    --accent:     #1a6fd4;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--er-bg);
    color: var(--er-dark);
    overflow-x: hidden;
}

/* Cabecera */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--er-border);
    padding: 14px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.timer-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--er-dark);
    color: #ffffff;
    padding: 8px 16px;
    border-radius: 8px;
    font-family: monospace;
    font-size: 1.2rem;
    font-weight: 800;
}

.timer-low {
    background-color: var(--er-red);
    animation: blink 1s step-start infinite;
}

/* Contenedor principal */
#quiz {
    display: block;
    max-width: 1000px;
    margin: 30px auto;
    padding: 20px;
}

/* Tarjeta de pregunta */
.q-card {
    background: #ffffff;
    border: 1px solid var(--er-border);
    border-radius: 20px;
    padding: 48px;
    min-height: 450px;
    box-shadow: 0 2px 8px 0 rgba(11,32,64,0.06);
}

.q-meta {
    display: inline-block;
    background: #eff6ff;
    color: var(--er-blue);
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    padding: 4px 12px;
    border-radius: 99px;
    margin-bottom: 16px;
}

.q-text {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.45;
    margin-bottom: 28px;
}

/* Opciones */
.option {
    display: flex;
    align-items: center;
    padding: 18px 20px;
    margin-bottom: 10px;
    border: 1.5px solid var(--er-border);
    border-radius: 12px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.option:hover {
    background-color: #f8fafc;
    border-color: var(--er-blue);
}

.option.selected {
    background-color: #eff6ff;
    border-color: var(--er-blue);
    border-width: 2px;
}

.option.correct {
    background-color: var(--er-green) !important;
    border-color: var(--er-green) !important;
    color: #ffffff !important;
    font-weight: 700;
}

.option.incorrect {
    background-color: var(--er-red) !important;
    border-color: var(--er-red) !important;
    color: #ffffff !important;
}

/* Explicación */
.exp-box {
    display: none;
    margin-top: 24px;
    padding: 18px 20px;
    background-color: #fffbeb;
    border-left: 5px solid var(--er-amber);
    border-radius: 8px;
    font-size: 0.92rem;
    color: #451a03;
    line-height: 1.55;
}

/* Navegación */
.nav-footer {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.btn {
    flex: 1;
    padding: 16px;
    border: none;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.875rem;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.btn:hover { opacity: 0.88; }
.btn-next   { background-color: var(--er-dark);  color: #ffffff; }
.btn-finish { background-color: var(--er-green); color: #ffffff; }

/* Grid de puntos */
.dot-grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 8px;
    margin-top: 28px;
}

.dot {
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--er-border);
    border-radius: 8px;
    background: #ffffff;
    font-size: 0.82rem;
    cursor: pointer;
    transition: background-color 0.15s ease, transform 0.15s ease;
}

.dot.active {
    background-color: var(--er-dark);
    border-color: var(--er-dark);
    color: #ffffff;
    font-weight: 800;
    transform: scale(1.06);
}

.dot.done {
    background-color: #f1f5f9;
    border-bottom: 4px solid var(--er-blue);
}

/* Pantalla de resultados */
#results {
    display: none;
    text-align: center;
    padding: 80px 20px;
}

.score-badge {
    font-size: 6rem;
    font-weight: 900;
    color: var(--er-dark);
    letter-spacing: -3px;
    line-height: 1;
}

.score-sub {
    font-size: 1.15rem;
    color: #64748b;
    margin-bottom: 32px;
    margin-top: 8px;
}

/* Focus accesibilidad */
.option:focus,
.dot:focus,
.btn:focus {
    outline: 3px solid var(--er-blue);
    outline-offset: 2px;
}

/* Animaciones */
@keyframes blink {
    50% { opacity: 0.45; }
}

/* Responsive móvil */
@media (max-width: 640px) {
    #quiz        { padding: 10px; }
    .q-card      { padding: 20px; min-height: auto; }
    .q-text      { font-size: 1.1rem; }
    .option      { padding: 13px 15px; }
    .dot-grid    { grid-template-columns: repeat(5, 1fr); gap: 6px; }
    .dot         { height: 34px; font-size: 0.75rem; }
    .nav-footer  { flex-wrap: wrap; gap: 8px; }
    .btn         { padding: 13px 8px; font-size: 0.78rem; }
    .score-badge { font-size: 4rem; }
    #results     { padding: 40px 15px; }
}