.form-group {
    margin-bottom: 0.9rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: #8b949e;
    margin-bottom: 0.3rem;
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.form-group input[type="number"],
.form-group input[type="text"],
.form-group select {
    width: 100%;
    padding: 0.55rem 0.8rem;
    border: 1px solid #30363d;
    border-radius: 6px;
    font-size: 0.88rem;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-weight: 500;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: #161b22;
    color: #e6edf3;
}

.form-group input[type="number"]:focus,
.form-group input[type="text"]:focus,
.form-group select:focus {
    outline: none;
    border-color: #00aaff;
    box-shadow: 0 0 0 2px rgba(0,170,255,0.2);
    background: #0e131a;
}

.form-group .unidad {
    display: inline-block;
    margin-top: 0.25rem;
    color: #00aaff;
    font-size: 0.72rem;
    font-family: 'JetBrains Mono', monospace;
    opacity: 0.8;
    font-style: normal;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    padding-right: 40px;
}

/* Checkbox personalizado */
.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
    margin: 0;
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: 10px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* Input number sin flechas en algunos navegadores */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    opacity: 1;
}

/* Estilos para validación */
.form-group input.error {
    border-color: var(--danger-color);
}

.form-group input.success {
    border-color: var(--success-color);
}

.error-message {
    color: var(--danger-color);
    font-size: 0.85em;
    margin-top: 5px;
    display: none;
}

.error-message.show {
    display: block;
}

/* Estilos para inputs deshabilitados */
.form-group input:disabled,
.form-group select:disabled {
    background-color: #1a1d21;
    cursor: not-allowed;
    opacity: 0.4;
}

/* Hover effects */
.form-group input[type="number"]:hover:not(:disabled),
.form-group select:hover:not(:disabled) {
    border-color: var(--secondary-color);
}

/* Grupos de campos relacionados */
.form-group-inline {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

/* Tooltip para ayuda */
.form-group .help-icon {
    display: inline-block;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    text-align: center;
    font-size: 12px;
    font-weight: bold;
    margin-left: 5px;
    cursor: help;
    line-height: 18px;
}

.form-group .help-icon:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    background: var(--dark-bg);
    color: white;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.85em;
    white-space: nowrap;
    z-index: 1000;
    margin-left: 10px;
}

/* Sección de información */
.info-box {
    background: rgba(0,170,255,0.05);
    border-left: 3px solid #00aaff;
    padding: 0.75rem 1rem;
    margin: 0.75rem 0;
    border-radius: 4px;
}

.info-box h4 {
    color: #00aaff;
    margin-bottom: 0.4rem;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.info-box p {
    color: #8b949e;
    font-size: 0.78rem;
    line-height: 1.5;
    margin: 0;
}

/* Range slider personalizado (por si lo necesitas) */
input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* ── Editor de niveles (RIDAA) ───────────────────────── */
/* Selector "¿Todos los pisos son iguales?" */
.niv-modo { margin-bottom: 0.8rem; }
.niv-modo-pregunta {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    color: #e6edf3;
    margin-bottom: 0.4rem;
}
.niv-modo-opciones {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 1px solid #30363d;
    border-radius: 6px;
    overflow: hidden;
}
.niv-modo-btn {
    padding: 0.5rem;
    border: none;
    background: #161b22;
    color: #8b949e;
    font-size: 0.78rem;
    cursor: pointer;
}
.niv-modo-btn + .niv-modo-btn { border-left: 1px solid #30363d; }
.niv-modo-btn.activo {
    background: rgba(0,170,255,0.15);
    color: #00aaff;
    font-weight: 700;
}
.niv-modo .niv-ayuda { margin: 0.4rem 0 0; }

/* Piso tipo */
.niv-tipo {
    border: 1px solid #30363d;
    border-radius: 7px;
    padding: 0.6rem;
    background: #0d1117;
    margin-bottom: 0.5rem;
}
.niv-tipo-titulo {
    font-size: 0.8rem;
    font-weight: 700;
    color: #e6edf3;
    margin-bottom: 0.5rem;
}
.niv-total {
    font-size: 0.75rem;
    color: #8b949e;
    padding: 0.5rem 0.6rem;
    border-left: 3px solid #00aaff;
    background: rgba(0,170,255,0.06);
    border-radius: 4px;
    margin-bottom: 0.8rem;
}
.niv-total strong { color: #e6edf3; }

/* Recintos y artefactos resultantes */
.niv-recintos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(5.5rem, 1fr));
    gap: 0.4rem;
    align-items: end;
}
.niv-art-calc {
    font-size: 0.68rem;
    color: #3fb950;
    line-height: 1.4;
}
.niv-extras > summary {
    cursor: pointer;
    font-size: 0.7rem;
    color: #8b949e;
    margin-bottom: 0.3rem;
}
.niv-extras[open] { display: flex; flex-direction: column; gap: 0.3rem; }

/* Indicador de cálculo automático */
.calculo-auto {
    font-size: 0.72rem;
    color: #3fb950;
    text-align: center;
    margin-top: 0.5rem;
}
.calculo-auto.con-errores { color: #d29922; }

.niv-lbl {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.66rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: #8b949e;
    min-width: 0;
}

.niv-txt, .niv-num, .niv-sel {
    width: 100%;
    min-width: 0;
    padding: 0.4rem 0.5rem;
    border: 1px solid #30363d;
    border-radius: 5px;
    background: #161b22;
    color: #e6edf3;
    font-size: 0.8rem;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
}
.niv-txt:focus, .niv-num:focus, .niv-sel:focus {
    outline: none;
    border-color: #00aaff;
    box-shadow: 0 0 0 2px rgba(0,170,255,0.2);
}

.niv-nivel {
    border: 1px solid #30363d;
    border-radius: 7px;
    margin-bottom: 0.5rem;
    background: #0d1117;
}
.niv-nivel > summary {
    cursor: pointer;
    padding: 0.55rem 0.7rem;
    color: #e6edf3;
    font-size: 0.82rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    align-items: baseline;
}
.niv-nivel[open] > summary { border-bottom: 1px solid #30363d; }
.niv-resumen {
    color: #00aaff;
    font-size: 0.7rem;
    font-family: 'JetBrains Mono', monospace;
}
.niv-body { padding: 0.6rem 0.7rem; }

.niv-fila2, .niv-fila3 {
    display: grid;
    gap: 0.45rem;
    margin-bottom: 0.5rem;
}
.niv-fila2 { grid-template-columns: 1fr 1fr; }
.niv-fila3 { grid-template-columns: repeat(3, 1fr); }

.niv-grupo {
    border: 1px dashed #30363d;
    border-radius: 6px;
    padding: 0.55rem;
    margin-bottom: 0.55rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}
.niv-grupo-head { display: flex; gap: 0.4rem; }
.niv-grupo-nombre { font-weight: 700; }

.niv-art-head {
    display: flex;
    justify-content: space-between;
    font-size: 0.62rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #8b949e;
    padding-right: 2.2rem;
}
.niv-art {
    display: grid;
    grid-template-columns: 1fr 3.6rem 1.8rem;
    gap: 0.3rem;
}
.niv-art.custom {
    grid-template-columns: 1fr 1fr 3rem 3rem 3.6rem 1.8rem;
}

.niv-btn {
    padding: 0.4rem 0.6rem;
    border: 1px solid #30363d;
    border-radius: 5px;
    background: #161b22;
    color: #00aaff;
    font-size: 0.75rem;
    cursor: pointer;
}
.niv-btn:hover:not([disabled]) { border-color: #00aaff; }
.niv-btn[disabled] { opacity: 0.4; cursor: not-allowed; }
.niv-btn-peligro { color: #f85149; }
.niv-btn-agregar { width: 100%; margin-top: 0.2rem; }
.niv-btn-x {
    border: 1px solid #30363d;
    border-radius: 5px;
    background: transparent;
    color: #8b949e;
    cursor: pointer;
    font-size: 0.75rem;
}
.niv-btn-x:hover { color: #f85149; border-color: #f85149; }

.niv-acciones { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.niv-ayuda {
    font-size: 0.7rem;
    color: #8b949e;
    margin: 0.2rem 0 0.8rem;
    line-height: 1.4;
}

/* ── Tablas de cálculo ───────────────────────────────── */
.tabla-scroll { overflow-x: auto; }
.tabla-calculo {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.72rem;
    font-family: 'JetBrains Mono', monospace;
    margin-bottom: 0.6rem;
}
.tabla-calculo th, .tabla-calculo td {
    border: 1px solid #30363d;
    padding: 0.3rem 0.45rem;
    text-align: right;
    white-space: nowrap;
    color: #e6edf3;
}
.tabla-calculo th {
    background: #161b22;
    color: #8b949e;
    font-weight: 600;
}
.tabla-calculo td:first-child, .tabla-calculo th:first-child { text-align: left; }
.tabla-calculo .fila-alerta td { color: #f0b429; }

/* Dotación ingresada a mano: distinta del recomendado / fuera del Anexo 4 */
.niv-num.niv-modificado { border-color: #d29922; }
.niv-num.niv-fuera { border-color: #f85149; color: #f85149; }
.niv-recinto-detalle {
    font-size: 0.6rem;
    font-weight: 400;
    text-transform: none;
    letter-spacing: 0;
    color: #6e7681;
}

/* Nota de selección de bombas */
.nota-bombas {
    border-left: 3px solid #d29922;
    background: rgba(210,153,34,0.08);
    padding: 0.5rem 0.6rem;
    border-radius: 4px;
}