* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
    background: #0f172a;
    color: #e5e7eb;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 30px 15px;
}

.container {
    background: #111827;
    border-radius: 16px;
    padding: 24px;
    max-width: 900px;
    width: 100%;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

h1, h2, h3 {
    color: #f9fafb;
    margin-bottom: 12px;
}

h1 {
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: 20px;
}

.button-row {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.btn {
    padding: 10px 20px;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    background: #2563eb;
    color: #f9fafb;
    font-weight: 600;
    transition: transform 0.1s ease, box-shadow 0.1s ease, background 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(37,99,235,0.4);
}

.btn-secondary {
    background: #374151;
}

.btn-secondary:hover {
    background: #4b5563;
}

.card {
    background: #020617;
    border-radius: 12px;
    padding: 16px 18px;
    margin-bottom: 16px;
    border: 1px solid #1f2937;
}

.ranking-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
}

.ranking-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    margin-top: 8px;
}

.ranking-table th,
.ranking-table td {
    padding: 6px 8px;
    border-bottom: 1px solid #1f2937;
}

.ranking-table th {
    text-align: left;
    color: #9ca3af;
    font-weight: 600;
}

.ranking-table td {
    color: #e5e7eb;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: #111827;
    color: #9ca3af;
}

/* Quiz */

.quiz-container {
    margin-top: 16px;
}

.question-box {
    margin-top: 16px;
    background: #020617;
    border-radius: 12px;
    border: 1px solid #1f2937;
    padding: 16px;
}

.question-text {
    margin-bottom: 12px;
}

.options {
    display: grid;
    gap: 8px;
    margin-top: 10px;
}

.option-btn {
    width: 100%;
    text-align: left;
}

.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
    font-size: 0.9rem;
    color: #9ca3af;
}

.status-bar span {
    margin-right: 8px;
}

#mensaje {
    margin-top: 10px;
    font-size: 0.95rem;
}

.mensaje-correcto {
    color: #22c55e;
}

.mensaje-incorrecto {
    color: #f97316;
}

.mensaje-info {
    color: #e5e7eb;
}

/* Imagen en bimestre 2 */
.quiz-image {
    max-width: 100%;
    border-radius: 8px;
    display: block;
    margin: 10px auto;
    border: 1px solid #1f2937;
}