* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow: hidden;
}

/* Esquemas de color */
/* Esquema Claro */
body.esquema-claro {
    background-color: #000000;
    color: #ffffff;
}
body.esquema-claro .panel-control {
    background-color: #2d3748;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}
body.esquema-semioscuro { background-color: #4a5568; color: #edf2f7; }
body.esquema-semioscuro .panel-control { background-color: #2d3748; box-shadow: 0 4px 6px rgba(0,0,0,0.3); }

body.esquema-oscuro { background-color: #000000; color: #ffffff; }
body.esquema-oscuro .panel-control { background-color: #1a202c; border: 1px solid #4a5568; }

/* Panel de control */
.panel-control { padding: 30px; border-radius: 12px; width: 90%; max-width: 450px; text-align: center; z-index: 10; }
h1 { font-size: 1.5rem; margin-bottom: 10px; }
.leyenda { font-size: 1.1rem; font-weight: bold; color: #e53e3e; margin-bottom: 25px; }
body.esquema-oscuro .leyenda { color: #fc8181; }
.grupo-control { margin-bottom: 18px; text-align: left; }
.grupo-control label { display: block; margin-bottom: 6px; font-size: 0.9rem; }
.grupo-control select, .grupo-control input[type="range"] { width: 100%; padding: 8px; border-radius: 6px; border: 1px solid #cbd5e0; background-color: transparent; color: inherit; }
.grupo-control-inline { margin-bottom: 20px; text-align: left; display: flex; align-items: center; gap: 10px; }
.btn-principal { width: 100%; padding: 12px; border: none; border-radius: 6px; background-color: #3182ce; color: white; font-size: 1rem; font-weight: bold; cursor: pointer; }
.btn-principal:hover { background-color: #2b6cb0; }

/* Zona de ejercicio */
.zona-ejercicio {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: inherit;
    z-index: 20;
}

/* El contenedor ahora usa coordenadas directas controladas por JS */
#contenedor-objeto {
    position: absolute;
    transform: translate(-50%, -50%);
    transition: none;
}

#objeto-visual { user-select: none; line-height: 1; display: inline-block; }
.cronometro-discreto { position: absolute; top: 15px; left: 15px; font-size: 0.8rem; opacity: 0.3; font-family: monospace; }

/* Ventana modal de métricas */
.modal-metricas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}
.contenido-modal { background-color: #ffffff; color: #2d3748; padding: 30px; border-radius: 12px; max-width: 400px; width: 90%; text-align: center; }
body.esquema-semioscuro .contenido-modal, body.esquema-oscuro .contenido-modal { background-color: #2d3748; color: #edf2f7; border: 1px solid #4a5568; }
.contenido-modal h2 { color: #3182ce; margin-bottom: 20px; }
.tabla-metricas { width: 100%; margin-bottom: 25px; border-collapse: collapse; }
.tabla-metricas td { padding: 10px; text-align: left; border-bottom: 1px solid #e2e8f0; }
body.esquema-semioscuro .tabla-metricas td, body.esquema-oscuro .tabla-metricas td { border-bottom: 1px solid #4a5568; }
.tabla-metricas td:last-child { text-align: right; font-weight: bold; color: #2b6cb0; }
body.esquema-semioscuro .tabla-metricas td:last-child, body.esquema-oscuro .tabla-metricas td:last-child { color: #63b3ed; }